阅读说明：本技术 一种无线电能传输系统的双边保护电路装置及方法 (Bilateral protection circuit device and method of wireless electric energy transmission system ) 是由 王振世 徐玮 李卓强 唐志俊 于 2019-09-16 设计创作，主要内容包括：本发明提供了一种无线电能传输系统的双边保护电路装置,用于包括车载端和地面端的车载式无线电能传输系统,双边保护电路装置包括地面端保护组件和车载端保护组件,地面端保护组件用于检测地面端是否发生异常,车载端保护组件用于检测车载端是否发生异常,当地面端部件和车载端部件任一发生故障时,可确保系统不发生能量的反向流动；进一步地,双边保护策略可以使系统进入一种安全状态,切断与外界能量提供源和负载的联系并提供了地面端和车载端直流母线电容电能的泄放路径,基于同样的发明构思,本发明还提供了一种无线电能传输系统的双边保护电路的方法。(The invention provides a bilateral protection circuit device of a wireless electric energy transmission system, which is used for a vehicle-mounted wireless electric energy transmission system comprising a vehicle-mounted end and a ground end, wherein the bilateral protection circuit device comprises a ground end protection component and a vehicle-mounted end protection component; furthermore, the bilateral protection strategy can enable the system to enter a safe state, cut off the connection with an external energy supply source and a load and provide a discharge path of direct current bus capacitor electric energy at the ground end and the vehicle-mounted end.)

1. A bilateral protection circuit arrangement for a wireless power transfer system, the wireless power transfer system including a source terminal and a load terminal, the bilateral protection circuit arrangement comprising a source terminal protection component and a load terminal protection component, wherein,

the source end protection component is arranged at the source end and used for detecting whether a source end fault occurs or not, and if the source end fault occurs, the source end protection component is used for enabling the source end to enter a safety mode;

the load end protection component is arranged at the load end and used for detecting whether a fault of the load end occurs or not, and if the fault occurs, the load end protection component is used for enabling the load end to enter the safety mode;

and the safety mode is to disconnect the power transmission between the load end and the source end.

2. The bilateral protection circuit device of claim 1, wherein the radio energy transmission system is a vehicle-mounted radio energy transmission system, the source terminal is a ground terminal, the load terminal is a vehicle-mounted terminal, the source terminal protection component is a ground terminal protection component, and the load terminal protection component is a vehicle-mounted terminal protection component;

the ground end protection assembly is arranged at the ground end and used for detecting whether ground end faults occur or not, and if the ground end faults occur, the ground end protection assembly is also used for enabling the ground end to enter a first safety mode;

the vehicle-mounted end protection assembly is arranged at the vehicle-mounted end and used for detecting whether a vehicle-mounted end fault occurs or not, and if the vehicle-mounted end fault occurs, the vehicle-mounted end protection assembly is used for enabling the vehicle-mounted end to enter the first safety mode;

the first safety mode is to disconnect the electric energy transmission between the ground end and the vehicle-mounted end.

3. The bilateral protection circuit arrangement of a wireless power transfer system of claim 2 wherein the ground side fault comprises a ground side overvoltage and a ground side overcurrent;

the ground end protection assembly comprises a ground end overvoltage detection module, a ground end overcurrent detection module, a ground end protection module and a ground end driving module;

the ground end overvoltage detection module is used for detecting whether the ground end is in overvoltage or not, and when the ground end is in overvoltage, the ground end overvoltage detection module is used for triggering the ground end protection module;

the ground end overcurrent detection module is used for detecting whether the ground end is in overcurrent or not, and when the ground end is in overcurrent, the ground end overcurrent detection module is used for triggering the ground end protection module;

the ground end protection module is used for triggering the ground end driving module;

and when the ground end driving module is triggered by the ground end protection module, the ground end driving module is used for stopping output driving.

4. The bilateral protection circuit device of claim 3, wherein the ground terminal further comprises a ground terminal main control module, and the ground terminal main control module is configured to receive the ground terminal fault information and send the ground terminal fault information to the vehicle terminal.

5. The bilateral protection circuit device of the wireless power transmission system according to claim 4, wherein the ground end further comprises a ground end PFC link module, the ground end overcurrent detection module comprises a ground end PFC link overcurrent detection module, the ground end overvoltage detection module comprises a ground end PFC link overvoltage detection module, the ground end overcurrent detection module comprises a ground end PFC link overcurrent detection module, the ground end protection module comprises a ground end PFC link hardware protection module, and the ground end driver module comprises a ground end PFC link driver module;

the ground end PFC link overvoltage detection module is used for detecting whether the ground end PFC link module is in overvoltage or not;

the ground end PFC link overcurrent detection module is used for detecting whether the ground end PFC link module is in overcurrent or not;

the ground end PFC link hardware protection module is triggered by the ground end PFC link overcurrent detection module and/or the ground end PFC link overvoltage detection module;

the ground end PFC link hardware protection module is used for triggering the ground end PFC link driving module to stop output driving.

6. The bilateral protection circuit device of the wireless power transmission system according to claim 5, wherein the ground-end PFC link hardware protection module is configured to transmit the ground-end overvoltage and/or the ground-end overcurrent of the ground-end PFC link module to the ground-end main control module; the ground end main control module is used for transmitting the ground end overvoltage and/or ground end overcurrent information of the ground end PFC link module to the vehicle-mounted end.

7. The bilateral protection circuit device of the wireless power transmission system according to claim 5, wherein the ground end further comprises a ground end resonant topology module, a ground end coil module, and a ground end full bridge circuit module, the ground end over-current detection module further comprises a ground end resonant topology over-current detection module, a ground end coil over-current detection module, the ground end driving module further comprises a ground end full bridge circuit driving module, and the ground end protection module further comprises a ground end hardware protection module;

the ground end resonant topology over-current detection module is used for detecting whether the ground end resonant topology module is over-current or not;

the ground end coil overcurrent detection module is used for detecting whether the ground end coil module is in overcurrent or not;

the ground end hardware protection module is triggered by the ground end PFC link overcurrent detection module, the ground end PFC link overvoltage detection module, the ground end resonant topology overcurrent detection module and/or the ground end coil overcurrent detection module;

the ground-end hardware protection module is used for triggering the ground-end full-bridge circuit driving module, and the ground-end full-bridge circuit driving module is used for triggering the conduction of an upper switching tube or a lower switching tube of the ground-end full-bridge circuit module;

the ground-end full-bridge circuit driving module is a full-bridge circuit driving module.

8. The bilateral protection circuit device of claim 7, wherein the ground-side hardware protection module is further configured to transmit the ground-side overvoltage of the ground-side PFC link module, the ground-side overcurrent of the ground-side resonant topology module, and/or the ground-side overcurrent of the ground-side coil module to the ground-side main control module;

the ground end main control module is used for transmitting information of the ground end overvoltage of the ground end PFC link module, the ground end overcurrent of the ground end resonance topology module and/or the ground end overcurrent of the ground end coil module to the vehicle-mounted end.

9. The bilateral protection circuit device of the wireless power transmission system according to claim 7 or 8, wherein the ground-side main control module is further configured to detect whether a voltage of the ground side exceeds a first voltage threshold and/or whether a current of the ground side exceeds a first current threshold;

when the wireless power transmission system receives a charging stop signal, the voltage of the ground end exceeds the first voltage threshold and/or the current of the ground end exceeds the first current threshold, the ground end main control module is used for triggering the ground end full-bridge circuit driving module, and the ground end full-bridge circuit driving module is used for triggering the upper two switching tubes or the lower two switching tubes of the ground end full-bridge circuit module to be conducted.

10. The bilateral protection circuit device of the wireless power transmission system according to claim 2, wherein the vehicle-mounted end fault includes a vehicle-mounted end overvoltage and a vehicle-mounted end overcurrent, and the vehicle-mounted end includes a vehicle-mounted end full-bridge circuit module;

the vehicle-mounted end protection assembly comprises a vehicle-mounted end overvoltage detection module, a vehicle-mounted end overcurrent detection module, a vehicle-mounted end hardware protection module and a vehicle-mounted end driving module;

the vehicle-mounted end overvoltage detection module is used for detecting whether the vehicle-mounted end is in overvoltage or not, and when the vehicle-mounted end is in overvoltage, the vehicle-mounted overvoltage detection module is used for triggering the vehicle-mounted end hardware protection module;

the vehicle-mounted end overcurrent detection module is used for detecting whether the vehicle-mounted end is in overcurrent or not, and when the vehicle-mounted end is in overcurrent, the vehicle-mounted end overcurrent detection module is used for triggering the vehicle-mounted end hardware protection module;

the vehicle-mounted end hardware protection module is used for triggering the vehicle-mounted end driving module;

when the vehicle-mounted end driving module is triggered by the vehicle-mounted end hardware protection module, the vehicle-mounted end driving module is used for triggering the upper two switches or the lower two switches of the vehicle-mounted end full-bridge circuit module to be conducted.

11. The bilateral protection circuit device of claim 10, wherein the vehicle-mounted terminal further comprises a vehicle-mounted terminal main control module, and the vehicle-mounted terminal main control module is configured to receive the vehicle-mounted terminal fault information and send the vehicle-mounted terminal fault information to the ground terminal.

12. The bilateral protection circuit device of the wireless power transmission system according to claim 11, wherein the vehicle-mounted terminal includes a vehicle-mounted terminal coil module, a vehicle-mounted terminal resonant topology module, and a vehicle-mounted terminal power battery module, and the vehicle-mounted terminal driving module includes a vehicle-mounted terminal full-bridge circuit driving module;

the vehicle-mounted end overcurrent detection module comprises a vehicle-mounted end coil overcurrent detection module, a vehicle-mounted end resonant topology overcurrent detection module and a vehicle-mounted end power battery overcurrent detection module;

the vehicle-mounted end overvoltage detection module comprises a vehicle-mounted end power battery overvoltage detection module;

the vehicle-mounted end coil overcurrent detection module is used for detecting whether the vehicle-mounted end coil module is in overcurrent or not;

the vehicle-mounted end resonance topology overcurrent detection module is used for detecting whether the vehicle-mounted end resonance topology module is in overcurrent or not;

the vehicle-mounted end power battery over-current detection module is used for detecting whether the vehicle-mounted end power battery module is over-current or not;

the vehicle-mounted end power battery overvoltage detection module is used for detecting whether the vehicle-mounted end power battery module is in overvoltage or not;

the vehicle-mounted end hardware protection module is triggered by the vehicle-mounted end coil overcurrent detection module, the vehicle-mounted end resonant topology overcurrent detection module, the vehicle-mounted end power battery overcurrent detection module and/or the vehicle-mounted end power battery overvoltage detection module;

the vehicle-mounted end hardware protection module is used for triggering the vehicle-mounted end full-bridge circuit driving module, and the vehicle-mounted end full-bridge circuit driving module is used for triggering the conduction of an upper switching tube or a lower switching tube of the vehicle-mounted end full-bridge circuit module;

the vehicle-mounted end full-bridge circuit driving module is a full-bridge circuit driving module.

13. The bilateral protection circuit device of a wireless power transmission system according to claim 12, wherein the vehicle-mounted end hardware protection module is further configured to transmit information of the vehicle-mounted end overcurrent of the vehicle-mounted end coil module, the vehicle-mounted end overcurrent of the vehicle-mounted end resonant topology module, the vehicle-mounted end overcurrent of the vehicle-mounted end power battery module, and the vehicle-mounted end power battery module overvoltage to the vehicle-mounted end main control module;

the vehicle-mounted end main control module is used for transmitting information of vehicle-mounted end overcurrent of the vehicle-mounted end coil module, vehicle-mounted end overcurrent of the vehicle-mounted end resonance topology module, vehicle-mounted end overcurrent of the vehicle-mounted end power battery module and vehicle-mounted end power battery module overvoltage to the ground end.

14. The bilateral protection circuit device of the wireless power transmission system according to claim 12 or 13, wherein the vehicle-mounted end main control module is further configured to detect whether a voltage of the vehicle-mounted end exceeds a second voltage threshold and/or whether a current of the vehicle-mounted end exceeds a second current threshold;

when the wireless electric energy transmission system receives a charging stop signal, the vehicle-mounted end voltage exceeds the second voltage threshold value and/or the current of the vehicle-mounted end exceeds the second current threshold value, the vehicle-mounted end main control module is used for triggering the vehicle-mounted end full-bridge circuit driving module, and the vehicle-mounted end full-bridge circuit driving module is used for triggering the upper two switching tubes or the lower two switching tubes of the vehicle-mounted end full-bridge circuit module to be conducted.

15. The bilateral protection circuit device of wireless power transmission system according to any one of claims 7, 8, 12 or 13, wherein the full-bridge circuit driving module is configured to drive the full-bridge circuit module;

the full-bridge circuit driving module comprises a hysteresis comparison circuit module, and an isolation driving module and a safety control module which are in one-to-one correspondence with the switching tubes of the full-bridge circuit,

when the hysteresis comparison circuit module is triggered, the hysteresis comparison circuit module is used for triggering the isolation driving module to stop output driving;

when the isolation driving module stops outputting driving, the isolation driving module is used for triggering the safety control module, and the safety control module is used for enabling the switch tube of the full-bridge circuit module to be conducted.

16. A method for bilateral protection circuit of wireless power transmission system, the wireless power transmission system includes a source terminal and a load terminal, and the method includes:

detecting whether a source end fault occurs at a source end, and if so, disconnecting the electric energy transmission between the source end and the load end;

and detecting whether a load end fault occurs at the load end, and if so, disconnecting the electric energy transmission between the load end and the source end.

17. The method of claim 16, wherein the source terminal is a ground terminal and the load terminal is a vehicle terminal, comprising:

detecting whether a ground end fault occurs at the ground end, and if so, disconnecting the electric energy transmission between the ground end and the vehicle-mounted end;

detecting whether the vehicle-mounted end has a vehicle-mounted end fault, and if so, disconnecting the electric energy transmission between the vehicle-mounted end and the ground end;

the ground end fault comprises ground end overcurrent and/or ground end overvoltage;

the vehicle-mounted end faults comprise vehicle-mounted end overcurrent and/or vehicle-mounted end overvoltage.

18. The method of claim 17, wherein the detecting whether a ground fault occurs at the ground end and, if so, disconnecting the power transmission between the ground end and the vehicle-mounted end comprises:

step D1: detecting whether the ground end is subjected to ground end overvoltage, ground end overcurrent, a charging stop signal, the voltage of the ground end exceeds a first voltage threshold and/or the current of the ground end exceeds a first current threshold, and if so, executing a step D2;

step D2: and disconnecting the electric energy transmission between the vehicle-mounted end and the ground end.

19. The method for bilateral protection of wireless power transmission system of claim 18 wherein said step D2 further comprises discharging the electric energy of the capacitor at the ground terminal.

20. The method of claim 17, wherein the detecting whether the vehicle-mounted terminal has a vehicle-mounted terminal fault or not, and if so, disconnecting the power transmission between the vehicle-mounted terminal and the ground terminal comprises:

step C1: detecting whether the vehicle-mounted end is in overvoltage state, the vehicle-mounted end is in overcurrent state, a charging stop signal is generated, the voltage of the vehicle-mounted end exceeds a second voltage threshold value and/or the current of the vehicle-mounted end exceeds a second current threshold value, and if yes, executing the step C2;

step C2: and disconnecting the electric energy transmission between the vehicle-mounted end and the ground end.

21. The method for bilateral protection of wireless power transmission system according to claim 20, wherein said step C2 further comprises discharging the electric energy of the capacitor device of the vehicle-mounted terminal.

Technical Field

The invention relates to the technical field of electric energy transmission systems, in particular to a bilateral protection circuit device and a bilateral protection circuit method of a wireless electric energy transmission system.

Background

The wireless electric energy transmission is non-contact electric energy transmission, a series of defects and shortcomings of abrasion, sparks, inflexibility and the like caused by a traditional conductor physical contact transmission mode are effectively overcome by a wireless electric energy transmission technology, and the wireless electric energy transmission technology is rapidly developed by the advantages of convenience in charging, charging safety, environmental adaptability and the like; meanwhile, in order to save energy and reduce environmental pollution, electric vehicles are becoming more and more popular, and at present, due to the limitation of conditions such as battery capacity and charging infrastructure, the charging problem becomes the most important bottleneck problem in the development process of electric vehicles. Because wireless power transmission technology can solve interface restriction, the safety problem etc. that traditional conduction formula charging faced, on-vehicle induction type wireless power transmission system develops the main mode that electric automobile charges gradually. The vehicle-mounted induction type wireless power transmission system comprises a ground end and a vehicle-mounted end, and due to the fact that the ground end and the vehicle-mounted end are separated in space, the vehicle-mounted induction type wireless power transmission system has some defects in a protection module and a protection strategy.

In the prior art, a vehicle-mounted induction type wireless power transmission system consists of a ground end and a vehicle-mounted end, and the ground end is separated from the vehicle-mounted end, so that the inventor finds that the following three defects exist in the protection module and the protection strategy of the conventional wireless power transmission system through research:

the ground end and the vehicle-mounted end are in information sharing and exchange through wireless communication, when the ground end breaks down, the full-bridge circuit in the ground end stops outputting, meanwhile, fault information is sent to the vehicle-mounted end through wireless communication, and the full-bridge circuit in the vehicle-mounted end stops outputting. However, the fault processing circuit and the processing strategy ignore the delay time of wireless communication, in which the full-bridge circuit in the vehicle-mounted terminal component still works, so that the electric energy is reversely transmitted from the vehicle-mounted terminal to the ground terminal, and the voltage of the bus capacitor of the power factor correction link is sharply increased. On the contrary, when the vehicle-mounted end part breaks down, the full-bridge circuit in the vehicle-mounted end part stops outputting, but in the delay time, the full-bridge circuit in the ground end part still performs inversion work, and then the vehicle-mounted end charging current flows into the power battery through the full-bridge circuit switch parasitic diode in the vehicle-mounted end part, so that the protection effect is not achieved.

In practical application, the wireless power transmission system should have a safe state, when the system needs to stop working, a controllable working mode is needed, the working mode is not a hardware protection mode, the connection between the energy supply component and the energy absorption component is cut off rapidly, for a full-bridge circuit, due to the existence of the parasitic body diode, the cut-off of unidirectional energy is realized only when the output driving is stopped, and the probability that the system is in an unsafe state is increased.

In practical application, the ground terminal component comprises a power factor correction link, the output voltage of the ground terminal component is generally 400V or 800V, the capacitance value of a corresponding capacitor is about 3000 muF, a large amount of energy is stored in the capacitor, and similarly, a large amount of energy is stored in a direct current bus capacitor at the vehicle-mounted end. When the wireless power transmission system stops working, the energy should be discharged below the safe voltage, and the wireless power transmission system solution in the prior art has no power discharge path temporarily.

Disclosure of Invention

The invention provides a bilateral protection circuit device and a bilateral protection circuit method of a wireless electric energy transmission system, and the first purpose of the invention is that when any one of a source end and a load end has a fault, the wireless electric energy transmission system does not generate reverse flow of energy, and the source end and the load end both enter a protection state; another object of the present invention is to cut off the power transmission between the energy supplying component and the energy absorbing component when the system needs to stop working, so that the source end and the load end of the wireless power transmission system are in a safe state.

To achieve the above object, the present invention provides a bilateral protection circuit device of a wireless power transmission system, the wireless power transmission system includes a source terminal and a load terminal, the bilateral protection circuit device includes a source terminal protection component and a load terminal protection component, wherein,

the source end protection component is arranged at the source end and used for detecting whether a source end fault occurs or not, and if the source end fault occurs, the source end protection component is used for enabling the source end to enter a safety mode;

the load end protection assembly is arranged at the load end and used for detecting whether a fault of the load end occurs or not, and if the fault occurs, the load end protection assembly is used for enabling the load end to enter a safe mode;

and the safety mode is to disconnect the power transmission between the load end and the source end.

Optionally, the radio power transmission system is a vehicle-mounted radio power transmission system, the source end is a ground end, the load end is a vehicle-mounted end, the source end protection component is a ground end protection component, and the load end protection component is a vehicle-mounted end protection component;

the ground end protection assembly is arranged at the ground end and used for detecting whether ground end faults occur or not, and if the ground end faults occur, the ground end protection assembly is also used for enabling the ground end to enter the first safety mode;

the vehicle-mounted end protection assembly is arranged at the vehicle-mounted end and used for detecting whether a vehicle-mounted end fault occurs or not, and if the vehicle-mounted end fault occurs, the vehicle-mounted end protection assembly is used for enabling the vehicle-mounted end to enter the first safety mode;

the first safety mode is to disconnect the electric energy transmission between the ground end and the vehicle-mounted end.

Optionally, the ground end fault comprises a ground end overvoltage and a ground end overcurrent;

the ground end protection assembly comprises a ground end overvoltage detection module, a ground end overcurrent detection module, a ground end protection module and a ground end driving module;

the ground end overvoltage detection module is used for detecting whether the ground end is in overvoltage or not, and when the ground end is in overvoltage, the ground end overvoltage detection module is used for triggering the ground end protection module;

the ground end overcurrent detection module is used for detecting whether the ground end is in overcurrent or not, and when the ground end is in overcurrent, the ground end overcurrent detection module is used for triggering the ground end protection module;

the ground end protection module is used for triggering the ground end driving module;

and when the ground end driving module is triggered by the ground end protection module, the ground end driving module is used for stopping output driving.

Optionally, the ground end further includes a ground end main control module, and the ground end main control module is configured to receive the information of the ground end fault and send the information of the ground end fault to the vehicle-mounted end.

Optionally, the ground end further includes a ground end PFC link module, the ground end overcurrent detection module includes a ground end PFC link overcurrent detection module, the ground end overvoltage detection module includes a ground end PFC link overvoltage detection module, the ground end overcurrent detection module includes a ground end PFC link overcurrent detection module, the ground end protection module includes a ground end PFC link hardware protection module, and the ground end drive module includes a ground end PFC link drive module;

the ground end PFC link overvoltage detection module is used for detecting whether the ground end PFC link module is in overvoltage or not;

the ground end PFC link overcurrent detection module is used for detecting whether the ground end PFC link module is in overcurrent or not;

the ground end PFC link hardware protection module is triggered by the ground end PFC link overcurrent detection module and/or the ground end PFC link overvoltage detection module;

the ground end PFC link hardware protection module is used for triggering the ground end PFC link driving module to stop output driving.

Optionally, the ground PFC link hardware protection module is configured to transmit the ground end overvoltage and/or the ground end overcurrent of the ground PFC link module to the ground end main control module; the ground end main control module is used for transmitting the ground end overvoltage and/or ground end overcurrent information of the ground end PFC link module to the vehicle-mounted end.

Optionally, the ground end further includes a ground end resonant topology module, a ground end coil module, and a ground end full bridge circuit module, the ground end overcurrent detection module further includes a ground end resonant topology overcurrent detection module and a ground end coil overcurrent detection module, the ground end driving module further includes a ground end full bridge circuit driving module, and the ground end protection module further includes a ground end hardware protection module;

the ground end resonant topology over-current detection module is used for detecting whether the ground end resonant topology module is over-current or not;

the ground end coil overcurrent detection module is used for detecting whether the ground end coil module is in overcurrent or not;

the ground end hardware protection module is triggered by the ground end PFC link overcurrent detection module, the ground end PFC link overvoltage detection module, the ground end resonant topology overcurrent detection module and/or the ground end coil overcurrent detection module;

the ground-end hardware protection module is used for triggering the ground-end full-bridge circuit driving module, and the ground-end full-bridge circuit driving module is used for triggering the conduction of an upper switching tube or a lower switching tube of the ground-end full-bridge circuit module;

the ground-end full-bridge circuit driving module is a full-bridge circuit driving module.

Optionally, the ground end hardware protection module is further configured to transmit the ground end overvoltage of the ground end PFC link module, the ground end overcurrent of the ground end resonant topology module, and/or the ground end overcurrent of the ground end coil module to the ground end main control module;

the ground end main control module is used for transmitting information of the ground end overvoltage of the ground end PFC link module, the ground end overcurrent of the ground end resonance topology module and/or the ground end overcurrent of the ground end coil module to the vehicle-mounted end.

Optionally, the ground end main control module is further configured to detect whether a voltage of the ground end exceeds a first voltage threshold and/or whether a current of the ground end exceeds a first current threshold;

when the wireless power transmission system receives a charging stop signal, the voltage of the ground end exceeds the first voltage threshold and/or the current of the ground end exceeds the first current threshold, the ground end main control module is used for triggering the ground end full-bridge circuit driving module, and the ground end full-bridge circuit driving module is used for triggering the upper two switching tubes or the lower two switching tubes of the ground end full-bridge circuit module to be conducted.

Optionally, the vehicle-mounted end fault includes vehicle-mounted end overvoltage and vehicle-mounted end overcurrent, and the vehicle-mounted end includes a vehicle-mounted end full-bridge circuit module;

the vehicle-mounted end protection assembly comprises a vehicle-mounted end overvoltage detection module, a vehicle-mounted end overcurrent detection module, a vehicle-mounted end hardware protection module and a vehicle-mounted end driving module;

the vehicle-mounted end overvoltage detection module is used for detecting whether the vehicle-mounted end is in overvoltage or not, and when the vehicle-mounted end is in overvoltage, the vehicle-mounted overvoltage detection module is used for triggering the vehicle-mounted end hardware protection module;

the vehicle-mounted end overcurrent detection module is used for detecting whether the vehicle-mounted end is in overcurrent or not, and when the vehicle-mounted end is in overcurrent, the vehicle-mounted end overcurrent detection module is used for triggering the vehicle-mounted end hardware protection module;

the vehicle-mounted end hardware protection module is used for triggering the vehicle-mounted end driving module;

when the vehicle-mounted end driving module is triggered by the vehicle-mounted end hardware protection module, the vehicle-mounted end driving module is used for triggering the upper two switches or the lower two switches of the vehicle-mounted end full-bridge circuit module to be conducted.

Optionally, the vehicle-mounted terminal further includes a vehicle-mounted terminal main control module, and the vehicle-mounted terminal main control module is configured to receive information of the vehicle-mounted terminal fault and send the information of the vehicle-mounted terminal fault to the ground terminal.

Optionally, the vehicle-mounted end comprises a vehicle-mounted end coil module, a vehicle-mounted end resonance topology module and a vehicle-mounted end power battery module, and the vehicle-mounted end driving module comprises a vehicle-mounted end full-bridge circuit driving module;

the vehicle-mounted end overcurrent detection module comprises a vehicle-mounted end coil overcurrent detection module, a vehicle-mounted end resonant topology overcurrent detection module and a vehicle-mounted end power battery overcurrent detection module;

the vehicle-mounted end overvoltage detection module comprises a vehicle-mounted end power battery overvoltage detection module;

the vehicle-mounted end coil overcurrent detection module is used for detecting whether the vehicle-mounted end coil module is in overcurrent or not;

the vehicle-mounted end resonance topology overcurrent detection module is used for detecting whether the vehicle-mounted end resonance topology module is in overcurrent or not;

the vehicle-mounted end power battery over-current detection module is used for detecting whether the vehicle-mounted end power battery module is over-current or not;

the vehicle-mounted end power battery overvoltage detection module is used for detecting whether the vehicle-mounted end power battery module is in overvoltage or not;

the vehicle-mounted end hardware protection module is triggered by the vehicle-mounted end coil overcurrent detection module, the vehicle-mounted end resonant topology overcurrent detection module, the vehicle-mounted end power battery overcurrent detection module and/or the vehicle-mounted end power battery overvoltage detection module;

the vehicle-mounted end hardware protection module is used for triggering the vehicle-mounted end full-bridge circuit driving module, and the vehicle-mounted end full-bridge circuit driving module is used for triggering the conduction of an upper switching tube or a lower switching tube of the vehicle-mounted end full-bridge circuit module;

the vehicle-mounted end full-bridge circuit driving module is a full-bridge circuit driving module.

Optionally, the vehicle-mounted end hardware protection module is further configured to transmit information of the vehicle-mounted end overcurrent of the vehicle-mounted end coil module, the vehicle-mounted end overcurrent of the vehicle-mounted end resonant topology module, the vehicle-mounted end overcurrent of the vehicle-mounted end power battery module, and the vehicle-mounted end power battery module overvoltage to the vehicle-mounted end main control module;

the vehicle-mounted end main control module is used for transmitting information of vehicle-mounted end overcurrent of the vehicle-mounted end coil module, vehicle-mounted end overcurrent of the vehicle-mounted end resonance topology module, vehicle-mounted end overcurrent of the vehicle-mounted end power battery module and vehicle-mounted end power battery module overvoltage to the ground end.

Optionally, the vehicle-mounted end main control module is further configured to detect whether a voltage of the vehicle-mounted end exceeds a second voltage threshold and/or whether a current of the vehicle-mounted end exceeds a second current threshold;

when the wireless electric energy transmission system receives a charging stop signal, the vehicle-mounted end voltage exceeds the second voltage threshold value and/or the current of the vehicle-mounted end exceeds the second current threshold value, the vehicle-mounted end main control module is used for triggering the vehicle-mounted end full-bridge circuit driving module, and the vehicle-mounted end full-bridge circuit driving module is used for triggering the upper two switching tubes or the lower two switching tubes of the vehicle-mounted end full-bridge circuit module to be conducted.

Optionally, the full-bridge circuit driving module is configured to drive the full-bridge circuit module;

the full-bridge circuit driving module comprises a hysteresis comparison circuit module, and an isolation driving module and a safety control module which are in one-to-one correspondence with the switching tubes of the full-bridge circuit,

when the hysteresis comparison circuit module is triggered, the hysteresis comparison circuit module is used for triggering the isolation driving module to stop output driving;

when the isolation driving module stops outputting driving, the isolation driving module is used for triggering the safety control module, and the safety control module is used for enabling the switch tube of the full-bridge circuit module to be conducted.

Based on the same inventive concept, the present invention further provides a method for bilateral protection circuit of a wireless power transmission system, where the wireless power transmission system includes a source end and a load end, and includes:

detecting whether a source end fault occurs at a source end, and if so, disconnecting the electric energy transmission between the source end and the load end;

and detecting whether a load end fault occurs at the load end, and if so, disconnecting the electric energy transmission between the load end and the source end.

Optionally, the source end is a ground end, and the load end is a vehicle end, including:

detecting whether a ground end fault occurs at the ground end, and if so, disconnecting the electric energy transmission between the ground end and the vehicle-mounted end;

detecting whether the vehicle-mounted end has a vehicle-mounted end fault, and if so, disconnecting the electric energy transmission between the vehicle-mounted end and the ground end;

the ground end fault comprises ground end overcurrent and/or ground end overvoltage;

the vehicle-mounted end faults comprise vehicle-mounted end overcurrent and/or vehicle-mounted end overvoltage.

Optionally, the detecting whether a ground fault occurs at the ground end, and if so, disconnecting the power transmission between the ground end and the vehicle-mounted end includes:

step D1: detecting whether the ground end is subjected to ground end overvoltage, ground end overcurrent, a charging stop signal, the voltage of the ground end exceeds a first voltage threshold and/or the current of the ground end exceeds a first current threshold, and if so, executing a step D2;

step D2: and disconnecting the electric energy transmission between the vehicle-mounted end and the ground end.

Optionally, the step D2 further includes discharging the electric energy of the capacitor at the ground end.

Optionally, the detecting whether the vehicle-mounted end has a vehicle-mounted end fault, and if so, disconnecting the power transmission between the vehicle-mounted end and the ground end includes:

step C1: detecting whether the vehicle-mounted end is in overvoltage state, the vehicle-mounted end is in overcurrent state, a charging stop signal is generated, the voltage of the vehicle-mounted end exceeds a second voltage threshold value and/or the current of the vehicle-mounted end exceeds a second current threshold value, and if yes, executing the step C2;

step C2: and disconnecting the electric energy transmission between the vehicle-mounted end and the ground end.

Optionally, the step C2 further includes discharging the electric energy of the capacitive component at the vehicle-mounted end.

According to the bilateral protection circuit device of the wireless power transmission system, when a fault occurs at either the vehicle-mounted end or the ground end, the ground end protection component and the vehicle-mounted end protection component are used for protecting the system from reverse flow of energy; furthermore, the connection between the external energy source end and the load end is cut off; and an electric energy discharge path of the direct current bus capacitor at the ground end and the vehicle-mounted end is provided, so that the system enters a safe state. The method for bilateral protection of the circuit device based on the wireless power transmission system has the technical effect corresponding to the bilateral protection circuit device.

Drawings

Fig. 1 is a schematic diagram of an overall structure of a bilateral protection circuit device of a wireless power transmission system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a ground-side structure of a bilateral protection circuit device of a wireless power transmission system according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a vehicle-mounted end of a bilateral protection circuit device of a wireless power transmission system according to an embodiment of the present invention;

fig. 4 is a schematic diagram of two switches in a ground-side full-bridge circuit module of a bilateral protection circuit device of a wireless power transmission system in a simultaneous on state according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a vehicle-mounted full-bridge circuit driving module of a bilateral protection circuit device of a wireless power transmission system according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a ground-end high-voltage dc bus capacitive energy discharge circuit of a bilateral protection circuit apparatus of a wireless power transmission system according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a capacitive energy discharge loop of a high-voltage direct-current bus at a vehicle-mounted end of a bilateral protection circuit device of a wireless power transmission system according to an embodiment of the present invention;

fig. 8 is a schematic ground-side flow chart illustrating a bilateral protection method of a wireless power transmission system according to an embodiment of the present invention;

fig. 9 is a vehicle-mounted end flow diagram of a bilateral protection method of a wireless power transmission system according to an embodiment of the present invention;

wherein the reference numerals are as follows:

1-ground end hardware protection module, 2-vehicle end hardware protection module, 3-ground end PFC link hardware protection module, 4-ground end master control MCU module, 5-vehicle end master control MCU module, 6-ground end PFC link overvoltage detection module, 7-ground end PFC link overcurrent detection module, 8-ground end PFC link drive module, 9-ground end full bridge circuit drive module, 10-ground end resonant topology overcurrent detection module, 11-ground end coil overcurrent detection module, 12-vehicle end coil overcurrent detection module, 13-vehicle end resonant topology overcurrent detection module, 14-vehicle end circuit drive module, 15-vehicle end power battery overvoltage detection module, 16-vehicle end power battery overcurrent detection module, 17-single-phase/three-phase AC power network, 18-ground end PFC link module, 19-ground end full bridge circuit module, 20-ground end resonance topology module, 21-ground end coil module, 22-vehicle end coil module, 23-vehicle end resonance topology module, 24-vehicle end full bridge circuit module, 25-vehicle end power battery module, 91-first isolation driving module, 92-second isolation driving module-, 93-third isolation driving module, 94-fourth isolation driving module, 95-hysteresis comparison circuit module, 96-first safety control module, 97-second safety control module, 191-first switch tube, 192-second switch tube, 193-third switch tube, 194-fourth switch tube.

Detailed Description

The core idea of the invention is to provide a bilateral protection circuit device of a wireless electric energy transmission system, so as to solve the above disadvantages (one) in the prior art, without depending on software communication for information sharing, when any one of the ground end and the vehicle-mounted end has a fault, without considering delay time, both ends can enter a protection state; further, the above-mentioned deficiency (two) that exists among the prior art is solved, when the wireless power transmission system needs to stop working, cut off the part that provides energy and the part that absorbs energy, make the wireless power transmission system be in safe state.

In order to realize the idea, the invention is realized by the following technical scheme:

the invention provides a bilateral protection circuit device of a wireless power transmission system, wherein the wireless power transmission system comprises a source end and a load end, the bilateral protection circuit device comprises a source end protection component and a load end protection component, wherein,

the source end protection component is arranged at the source end and used for detecting whether a source end fault occurs or not, and if the source end fault occurs, the source end protection component is used for enabling the source end to enter a safety mode;

the load end protection assembly is arranged at the load end and used for detecting whether a fault of the load end occurs or not, and if the fault occurs, the load end protection assembly is used for enabling the load end to enter a safe mode;

and the safety mode is to disconnect the power transmission between the load end and the source end.

Based on the same inventive concept, the present invention further provides a method for bilateral protection circuit of a wireless power transmission system, where the wireless power transmission system includes a source end and a load end, and includes:

detecting whether a source end fault occurs at a source end, and if so, disconnecting the electric energy transmission between the source end and the load end;

and detecting whether a load end fault occurs at the load end, and if so, disconnecting the electric energy transmission between the load end and the source end.

To make the objects, advantages and features of the present invention more apparent, the dual edge protection circuit apparatus of the wireless power transmission system according to the present invention will be described in detail with reference to fig. 1 to 7. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

< example one >

For convenience of understanding, in the present embodiment, a vehicle-mounted wireless power transmission system is taken as an example to illustrate a bilateral protection circuit device of a wireless power transmission system provided by the present invention, and as shown in fig. 1, the bilateral protection circuit device is a schematic structural diagram of the bilateral protection circuit device of the wireless power transmission system of the present embodiment, and the bilateral protection circuit device of the wireless power transmission system of the present embodiment is used for a vehicle-mounted wireless power transmission system, and the wireless power transmission system includes a ground end and a vehicle-mounted end, and the ground end and the vehicle-mounted end perform information sharing and interaction through wireless communication.

As can be seen from fig. 1, the ground end includes a ground end main control MCU module 4 and a ground end protection component, the ground end protection component is disposed at the ground end and is configured to detect whether a ground end fault occurs, and if so, the ground end protection component is further configured to enable the ground end to enter a first safety mode; the vehicle-mounted end comprises a vehicle-mounted end main control MCU module 5 and a vehicle-mounted end protection assembly, the vehicle-mounted end protection assembly is arranged at the vehicle-mounted end and used for detecting whether a vehicle-mounted end fault occurs or not, and if the vehicle-mounted end fault occurs, the vehicle-mounted end protection assembly is used for enabling the vehicle-mounted end to enter the first safety mode;

the first safety mode is to disconnect the electric energy transmission between the ground end and the vehicle-mounted end.

For convenience of understanding, the ground terminal is first described, the vehicle terminal is then described, and finally, the simultaneous conduction state of the two switching tubes under the ground-terminal full-bridge circuit and the ground-terminal full-bridge circuit driving module are explained.

One, ground end

As shown in fig. 2, the ground terminal is connected to a single-phase/three-phase ac power grid 17, and the ground terminal protection assembly includes a ground terminal overvoltage detection module, a ground terminal overcurrent detection module, a ground terminal protection module, and a ground terminal driving module.

The ground end overvoltage detection module is used for detecting whether the ground end is in overvoltage or not, and when the ground end is in overvoltage, the ground end overvoltage detection module is used for triggering the ground end protection module; the ground end overcurrent detection module is used for detecting whether the ground end is in overcurrent or not, and when the ground end is in overcurrent, the ground end overcurrent detection module is used for triggering the ground end protection module; when the first surface end protection module is triggered, the ground end protection module is used for triggering the ground end driving module; and when the ground end driving module is triggered by the ground end protection module, the ground end driving module is used for stopping output driving.

Wherein the overvoltage detection module and the overcurrent detection module can comprise detection of a plurality of voltage or current signals.

Further, the ground end further comprises a ground end PFC link module 18, the ground end overvoltage detection module comprises a ground end PFC overvoltage detection module 6, and the ground end PFC link overvoltage detection module 6 is configured to detect whether the ground end PFC link module 18 is overvoltage or not; the ground end overcurrent detection module comprises a ground end PFC link overcurrent detection module 7, and the ground end PFC overcurrent detection module 7 is used for detecting whether the ground end PFC link module 18 is in overcurrent or not; the ground end driving module comprises a ground end PFC link driving module 8; the ground end protection module comprises a ground end PFC link hardware protection module 3, and when the ground end PFC link overcurrent detection module 7 detects that the ground end PFC link module 18 is in overcurrent, the ground end PFC link overcurrent detection module 7 triggers the ground end PFC link hardware protection module 3; when the ground-end PFC link overvoltage detection module 6 detects that the ground-end PFC link module 18 is overvoltage, the ground-end PFC link overvoltage detection module 6 triggers the ground-end PFC link hardware protection module 3; when the ground PFC link hardware protection module 3 is triggered, the ground PFC link hardware protection module 3 is configured to trigger the ground PFC link driving module 8 to stop outputting driving, and the ground PFC link hardware protection module 3 is further configured to transmit information of the ground overvoltage and/or the ground overcurrent of the ground PFC link module 18 to the ground main control module.

The PFC is an abbreviation of Power Factor Correction, and the PFC link module 18 in this embodiment is for improving Power consumption of a ground end; in this embodiment, the ground side main control module is a ground side main control MCU module 4.

In another embodiment of the present invention, further, the ground end further includes a ground end resonance topology module 20, a ground end coil module 21 and a ground end full bridge circuit module 19, and the ground end overcurrent detection module further includes a ground end resonance topology overcurrent detection module 10 and a ground end coil overcurrent detection module 11; the ground end resonant topology overcurrent detection module 10 is configured to detect whether the ground end resonant topology module 20 is overcurrent; the ground end coil overcurrent detection module 11 is configured to detect whether the ground end coil module 21 is overcurrent; the ground end driving module further comprises a ground end full-bridge circuit driving module 9, wherein the ground end full-bridge circuit driving module is a 9-bit full-bridge circuit driving module.

The ground end protection module further comprises a ground end hardware protection module, and when the ground end PFC link overcurrent detection module 7 detects that the ground end PFC link module 18 is in overcurrent, the ground end PFC overcurrent detection module 7 triggers the ground end hardware protection module 1; when the ground-end PFC link overvoltage detection module 6 detects that the ground-end PFC link module 18 is overvoltage, the ground-end PFC overvoltage detection module 6 triggers the ground-end hardware protection module 1; when the ground end resonant topology overcurrent detection module 10 detects that the ground end resonant topology module 20 is overcurrent, the ground end resonant topology overcurrent detection module 10 triggers the ground end hardware protection module 1; when the ground end coil overcurrent detection module 11 detects that the ground end coil module 21 is overcurrent, the ground end coil overcurrent detection module 11 triggers the ground end hardware protection module 1. When the ground-side hardware protection module 1 is triggered, the ground-side hardware protection module 1 triggers the ground-side full-bridge circuit driving module 9, and when the ground-side full-bridge circuit driving module 9 is triggered, the ground-side full-bridge circuit driving module 9 triggers the upper two switching tubes or the lower two switching tubes of the ground-side full-bridge circuit module 19 to be conducted; the ground end hardware protection module 1 is further configured to transmit the ground end overvoltage and/or overvoltage to the ground end main control MCU module 4.

In still another embodiment of the present invention, the ground MCU master control module 1 is further configured to detect whether a voltage of the ground exceeds a first voltage threshold and/or whether a current of the ground exceeds a first current threshold; when the wireless power transmission system receives a charging stop signal, the voltage of the ground end exceeds the first voltage threshold and/or the current of the ground end exceeds the first current threshold, the ground end MCU master control module is configured to trigger the ground end full-bridge circuit driving module 9, the ground end full-bridge circuit driving module 9 is configured to trigger the upper two switching tubes or the lower two switching tubes of the ground end full-bridge circuit module 19 to be turned on, wherein the first voltage threshold and the first current threshold are preset values.

In summary, for the ground side, when any one of the overvoltage detection module 6 and the overcurrent detection module 7 of the ground-side PFC link is triggered, the hardware protection module 3 of the ground-side PFC link triggers the driving module 8 of the ground-side PFC link to stop outputting the driving signal, and informs the overvoltage and/or overcurrent information of the ground-side PFC link module 18 to the MCU 4 of the ground-side main control in the form of a level signal. When any one of the ground coil overcurrent detection module 11 is triggered, the ground hardware protection module 1 triggers the ground full-bridge circuit driving module 9, so that the upper two switch tubes or the lower two switch tubes of the ground full-bridge circuit module 19 are simultaneously switched on, and the fault information of the ground end is informed to the ground end main control MCU module 4 in the form of an isolation level signal pair. And the ground end main control MCU module 4 informs the vehicle end main control MCU module 5 of the ground end fault information through wireless communication.

Second, vehicle-mounted terminal

As shown in fig. 3, the vehicle-mounted terminal of the present embodiment includes a vehicle-mounted terminal full-bridge circuit module 24; the vehicle-mounted end protection assembly comprises a vehicle-mounted end overvoltage detection module and/or a vehicle-mounted end overcurrent detection module, a vehicle-mounted end hardware protection module 2 and a vehicle-mounted end driving module; the vehicle-mounted end overvoltage detection module is used for detecting whether the vehicle-mounted end is overvoltage or not, and the vehicle-mounted end overcurrent detection module is used for detecting whether the vehicle-mounted end is overcurrent or not. When the vehicle-mounted end overcurrent detection module detects that the vehicle-mounted end is in overcurrent, the vehicle-mounted end overcurrent detection module triggers the vehicle-mounted end hardware protection module 2; when the vehicle-mounted end overvoltage detection module detects that the vehicle-mounted end overvoltage detection module triggers the vehicle-mounted end hardware protection module 2. When the vehicle-mounted end hardware protection module 2 is triggered; the vehicle-mounted end hardware protection module 2 is used for triggering the vehicle-mounted end driving module; when the vehicle-mounted end driving module is triggered by the vehicle-mounted end hardware protection module 2, the vehicle-mounted end driving module is used for triggering the conduction of the upper two switches or the lower two switches of the vehicle-mounted end full-bridge circuit module 24, and transmitting the vehicle-mounted end overvoltage and/or the vehicle-mounted end overcurrent to the vehicle-mounted end main control module.

Further, the vehicle-mounted end main control module of the present embodiment is a vehicle-mounted end main control MCU module 5; the vehicle-mounted end comprises a vehicle-mounted end coil module 22 and/or a vehicle-mounted end resonance topology module 23 and a vehicle-mounted end power battery module 25; the vehicle-mounted end overcurrent detection module comprises a vehicle-mounted end coil overcurrent detection module 12, a vehicle-mounted end resonant topology overcurrent detection module 13 and a vehicle-mounted end power battery overcurrent detection module 16; the vehicle-mounted end overvoltage detection module comprises a vehicle-mounted end power battery overvoltage detection module 15; the vehicle-mounted end coil overcurrent detection module 12 is configured to detect whether the vehicle-mounted end coil module 22 is overcurrent; the vehicle-mounted end resonance topology overcurrent detection module 13 is configured to detect whether the vehicle-mounted end resonance topology module 23 is overcurrent; the vehicle-mounted end power battery over-current detection module 16 is used for detecting whether the vehicle-mounted end power battery module 25 is over-current or not; the vehicle-mounted end power battery overvoltage detection module 15 is used for detecting whether the vehicle-mounted end power battery module 25 is in overvoltage or not; the vehicle-mounted end driving module comprises a vehicle-mounted end full-bridge circuit driving module 14, and the vehicle-mounted end full-bridge circuit driving module 14 is a full-bridge circuit driving module.

When the vehicle-mounted end coil overcurrent detection module 12 detects that the vehicle-mounted end coil module 22 is in overcurrent, the vehicle-mounted end coil overcurrent detection module 12 triggers the vehicle-mounted end hardware protection module 2; when the vehicle-mounted end resonant topology overcurrent detection module 13 detects that the vehicle-mounted end resonant topology module 23 is overcurrent, the vehicle-mounted end resonant topology overcurrent detection module 13 triggers the vehicle-mounted end hardware protection module 2; when the vehicle-mounted end power battery over-current detection module 16 detects that the vehicle-mounted end power battery module 25 is over-current, the vehicle-mounted end power battery over-current detection module 16 triggers the vehicle-mounted end hardware protection module 2; when the vehicle-mounted end power battery overvoltage detection module 15 detects that the vehicle-mounted end power battery module 25 is in overvoltage, the vehicle-mounted end power battery overvoltage detection module 15 triggers the vehicle-mounted end hardware protection module 2; when the vehicle-mounted end hardware protection module 2 is triggered, the vehicle-mounted end hardware protection module 2 triggers the vehicle-mounted end full-bridge circuit driving module 14; when the vehicle-mounted end full-bridge circuit driving module 14 is triggered, the vehicle-mounted end full-bridge circuit driving module 14 triggers the conduction of the upper two switch tubes or the lower two switch tubes of the vehicle-mounted end full-bridge circuit module 24; the vehicle-mounted end hardware protection module 2 is also used for transmitting the vehicle-mounted end fault to the vehicle-mounted end main control module.

In yet another embodiment of the present invention, the vehicle-mounted end main control MCU module 5 is further configured to detect whether a voltage of the vehicle-mounted end exceeds a second voltage threshold and/or whether a current of the vehicle-mounted end exceeds a second current threshold; when the wireless power transmission system receives a charging stop signal, the voltage of the vehicle-mounted end exceeds a second voltage threshold and/or the current of the vehicle-mounted end exceeds a second current threshold, the vehicle-mounted end main control MCU module 5 is used for triggering the vehicle-mounted end full-bridge circuit driving module 14, the vehicle-mounted end full-bridge circuit driving module 14 is used for triggering the conduction of the upper two switching tubes or the lower two switching tubes of the vehicle-mounted end full-bridge circuit module 24, wherein the second voltage threshold and the second current threshold are preset values.

In summary, for the vehicle-mounted end, when any one of the vehicle-mounted end coil overcurrent detection module 12, the vehicle-mounted end resonant topology overcurrent detection module 13, the vehicle-mounted end power battery overvoltage detection module 15, and the vehicle-mounted end power battery overcurrent detection module 16 is triggered, the vehicle-mounted end hardware protection module 2 triggers the vehicle-mounted end full-bridge circuit driving module 14, so that the upper two switch tubes or the lower two switch tubes of the vehicle-mounted end full-bridge circuit module 24 are simultaneously turned on, and the vehicle-mounted end fault information is notified to the vehicle-mounted end main control MCU module 5 in the form of an isolation level signal. The vehicle-mounted end main control MCU module 5 informs the ground end main control MCU module 4 of the vehicle-mounted end fault information through wireless communication.

Three, two switching tubes under ground end full bridge circuit are in conducting state simultaneously

As shown in fig. 4, in the wireless power transmission system, the ground-side full-bridge circuit module is in a state where the two lower switching tubes are simultaneously turned on, and therefore, the ground-side resonant topology module 20 generally has a current source characteristic, so that the two lower switching tubes 192 and 194 in the ground-side full-bridge circuit module 19 can be simultaneously turned on, the ground-side resonant topology module 20 is short-circuited, and the ground-side PFC link module 18 and the ground-side resonant topology module 20 are disconnected, and even though the vehicle-side full-bridge circuit module 24 is still working at this time, energy cannot flow from the vehicle-mounted power battery module 25 to the ground-side PFC link module 18 because the ground-side resonant topology module 20 is short-circuited by the two lower switching tubes 192 and 194. The system is considered to be in a safe and stable state at this time. In particular, those skilled in the art can use the above disclosure to put it in a contrary way, and can apply it to a switching power converter having a topology with current source characteristics, all of which are within the protection scope of the present invention.

Similarly, the working principle of the vehicle-mounted end full-bridge circuit module is similar, and the description is omitted here.

In this embodiment, only the implementation manner that two lower switching tubes of the second switching tube 192 and the fourth switching tube 194 are simultaneously turned on and two upper switching tubes of the first switching tube 191 and the third switching tube 193 are simultaneously turned off is described as an example, and according to the above disclosure, a person skilled in the art can put this into practice to realize that two upper switching tubes of the first switching tube 191 and the third switching tube 193 are simultaneously turned on and two lower switching tubes of the second switching tube 192 and the fourth switching tube 194 are simultaneously turned off, which is also within the protection scope of the present invention.

Four, ground terminal full bridge circuit driving module

Specifically, the ground-side full-bridge driving module 19 and the vehicle-side full-bridge driving module 24 in the above example are all full-bridge circuit driving modules, and the full-bridge circuit driving modules are used for driving the full-bridge circuits.

The full-bridge circuit driving module comprises a hysteresis comparison circuit module, an isolation driving module and a safety control module, wherein when the hysteresis comparison circuit module is triggered, the hysteresis comparison circuit module is used for triggering the isolation driving module to stop outputting driving; when the isolation driving module stops outputting driving, the isolation driving module is used for triggering the safety control module, and the safety control module is used for enabling the switch tube of the full-bridge circuit module to be conducted.

The ground-side full-bridge circuit driving module is taken as an example for explanation, and as shown in fig. 5, the ground-side full-bridge circuit driving module according to one embodiment of the present invention is shown in a schematic structural diagram. The ground-end full-bridge circuit driving module comprises four isolation driving modules, a hysteresis comparison circuit module 95 and two safety control modules; the isolation driving module is used for electrically isolating high voltage from low voltage; and the ground end main control MCU module 4 sends a driving signal to the isolation driving module. In this embodiment, the four isolation driving modules are a first isolation driving module 91, a second isolation driving module 92, a third isolation driving module 93 and a fourth isolation driving module 94; the hysteresis comparison circuit module is a hysteresis comparison circuit module 95; the two safety control modules are a first safety control module 96 and a second safety control module 97, respectively. The ground end main control MCU module 4 controls two upper switching tubes, namely a first switching tube 191 and a third switching tube 193, in the ground end full bridge circuit module 19 through a first isolation driving module 91 and a second isolation driving module 92; the ground end main control MCU module 4 controls the two lower switch tubes 192 and 194 in the ground end full bridge circuit module 19 through the third isolation driving module 93, the first safety control module 96, the fourth isolation driving module 94 and the second safety control module 97. The hysteresis comparison circuit module 95 receives the trigger signal of the ground-side hardware protection module 1, and is configured to trigger the first isolation driving module 91 and the second isolation driving module 92 to stop outputting driving, and trigger the first safety control module 96 and the second safety control module 97 to enter a safety state, that is, two lower switching tubes of the second switching tube 192 and the fourth switching tube 194 in the ground-side full-bridge circuit module 19 are turned on simultaneously.

In summary, the safety control module is configured to change the output to a constant high level when the hysteresis comparison circuit module 95 has a signal trigger, so that the lower two transistors are always in conduction, and meanwhile, the first isolation driving module 91 and the second isolation driving module 92 have an enable signal, and when the hysteresis comparison circuit module 95 has a signal trigger, the first isolation driving module 91 and the second isolation driving module 92 change the output to a constant low level. In this way, it is ensured that when the ground end fails, the two lower switching tubes 192 and 194 are always turned on at the same time, and the two upper switching tubes 191 and 193 are always turned off.

The always-off states of the two upper switching tubes of the first switching tube 191 and the third switching tube 193 trigger the first isolation driving module 91 and the second isolation driving module 92 through the hysteresis comparison circuit module 95.

Because the principle of the vehicle-mounted end full-bridge circuit driving module is the same as that of the ground end full-bridge circuit driving module, the detailed description is omitted, and persons skilled in the art can take the three steps from this point of view, but the two steps are within the protection scope of the invention.

In particular, the switch transistors in the ground-side full-bridge circuit module 19 and the vehicle-side full-bridge circuit module 24 may be MOS transistors, triodes, and/or IGBTs, where an IGBT (insulated Gate Bipolar transistor) is used.

In summary, under the condition that the wireless power transmission system does not generate hardware protection such as overvoltage and overcurrent, when the ground side main control MCU module 4 or the vehicle side main control MCU module 5 detects that the voltage or current exceeds the software limit value, or when the system receives a signal that the charging needs to be stopped rapidly, the ground side main control MCU module 4 turns on the upper two switch tubes or the lower two switch tubes of the ground side full bridge circuit module 19 simultaneously through the ground side full bridge circuit driving module 9, so that the system enters a safe state. Similarly, the same is true for the vehicle-mounted end, and the description is omitted, but the vehicle-mounted end and the vehicle-mounted end are within the protection scope of the invention.

Therefore, when any one of the ground end and the vehicle-mounted end of the wireless power transmission system has a hardware fault, the ground-end hardware protection module 1 and the vehicle-mounted-end hardware protection module 2 can enable the lower two switch tubes in the ground-end full-bridge circuit module 19 or the vehicle-mounted-end full-bridge circuit module 24 to be simultaneously conducted, so that the connection between a source and a load is rapidly cut off, and even if communication delay time exists, energy can be ensured not to be transmitted in a forward direction or a reverse direction; in addition, the two switching tubes in the bilateral full-bridge circuit are in a conducting state at the same time, which can be regarded as a safe state, the ground end resonance topology module 20, the ground end coil module 21, the vehicle end coil module 22 and the vehicle end resonance topology module 23 are completely isolated, and energy contained in the four modules cannot flow into other modules; particularly, the state can be realized not only by the ground end hardware protection module 1 and the vehicle-mounted end hardware protection module 2, but also by the control of the ground end main control MCU module 4, for example, the state can be entered into the safe state by two modes of software control and hardware protection, and the technical defects (one) and (two) in the prior art are solved.

When the wireless power transmission system stops working due to some reason, high-voltage capacitance energy of the components at the ground end and the components at the vehicle-mounted end needs to be discharged. For the dc capacitor C2 between the vehicle-mounted end power battery module 25 and the vehicle-mounted end full bridge circuit module 24, the bleeding path is as shown in fig. 6, at this time, the two lower switching tubes in the ground end full bridge circuit module 19 are in a simultaneous conducting state, the vehicle-mounted end full bridge circuit module 24 is in a normal duty cycle output state, and since the ground end resonant topology module 20 and the vehicle-mounted end resonant topology module 23 generally have a current source characteristic, the current in the two lower switching tubes in the ground end full bridge circuit module 19 is controllable, and then the energy in the dc capacitor C2 will be dissipated by the system in the form of heat.

For the dc capacitor C1 between the ground PFC link module 18 and the ground full bridge module 19, the bleeding path is as shown in fig. 7, at this time, the two lower switching tubes in the vehicle full bridge module 24 are in a simultaneous conducting state, the ground full bridge module 19 is in a normal duty cycle output state, and since the ground resonant topology module 20 and the vehicle resonant topology module 23 usually have a current source characteristic, the current in the two lower switching tubes in the vehicle full bridge module 24 is controllable, and the energy in the dc capacitor C1 is dissipated as heat by the system. In summary, the present invention solves the deficiencies (iii) in the prior art.

< example two >

Based on the same inventive concept, the invention also provides a method for bilateral protection circuit of wireless power transmission system, wherein the wireless power transmission system comprises a source end and a load end, the method for bilateral protection circuit of wireless power transmission system comprises:

detecting whether a source end fault occurs at a source end, and if so, disconnecting the electric energy transmission between the source end and the load end;

and detecting whether a load end fault occurs at the load end, and if so, disconnecting the electric energy transmission between the load end and the source end.

For convenience of understanding, in this embodiment, a vehicle-mounted wireless power transmission system is taken as an example for description, where the source end is a ground end, the load end is a vehicle-mounted end, and the method for the bilateral protection circuit of the wireless power transmission system includes:

detecting whether a ground end fault occurs at the ground end, and if so, disconnecting the electric energy transmission between the ground end and the vehicle-mounted end;

detecting whether the vehicle-mounted end has a vehicle-mounted end fault, and if so, disconnecting the electric energy transmission between the vehicle-mounted end and the ground end;

the ground end fault comprises ground end overcurrent and/or ground end overvoltage;

the vehicle-mounted end faults comprise vehicle-mounted end overcurrent and/or vehicle-mounted end overvoltage.

Obviously, the method of the bilateral protection circuit of the wireless power transmission system of the embodiment is invoked by the wireless power transmission system and executed when the wireless power transmission system operates.

Specifically, for convenience of description, a processing flow of the ground side of the method for the bilateral protection circuit of the wireless power transmission system is introduced in detail first, and then a processing flow of the vehicle side is introduced in detail.

Ground end

As shown in fig. 8, which is a schematic diagram of a ground-end process of a bilateral protection method of a wireless power transmission system according to this embodiment, it can be seen from the accompanying drawings: the method comprises the following steps:

step D1: detecting whether the ground end is subjected to ground end overvoltage, ground end overcurrent, a charging stop signal, the voltage of the ground end exceeds a first voltage threshold and/or the current of the ground end exceeds a first current threshold, and if so, executing a step D2;

step D2: and disconnecting the electric energy transmission between the vehicle-mounted end and the ground end.

Wherein step D2 further comprises discharging the electric energy of the capacitor at the ground terminal.

Vehicle-mounted terminal

As shown in fig. 9, which is a schematic diagram of a vehicle-mounted end flow of the bilateral protection method of the wireless power transmission system in this embodiment, as can be seen from fig. 9, the method includes:

step C1: detecting whether the vehicle-mounted end is in overvoltage state, the vehicle-mounted end is in overcurrent state, a charging stop signal is generated, the voltage of the vehicle-mounted end exceeds a second voltage threshold value and/or the current of the vehicle-mounted end exceeds a second current threshold value, and if yes, executing the step C2;

step C2: and disconnecting the electric energy transmission between the vehicle-mounted end and the ground end.

The step C2 further includes discharging the electric energy of the capacitive component at the vehicle-mounted end.

In summary, the above embodiments have described in detail various configurations of the dual-side protection circuit apparatus and the method of the wireless power transmission system, and it is understood that the above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way.