阅读说明：本技术 一种全桥开关电路电压电流相位检测装置及相位控制方法 (Full-bridge switching circuit voltage and current phase detection device and phase control method ) 是由 王振世 徐玮 李卓强 于 2019-09-16 设计创作，主要内容包括：本发明提供了一种全桥开关电路电压电流相位检测装置,用于具有全桥开关电路模块的电路系统,全桥开关电路电压电流相位检测装置包括相位检测模块和控制器模块；相位检测模块用于将所述全桥开关电路模块交流侧的电压信号和电流信号之间的相位关系转化为PWM占空比信号,并输出与相位关系对应的PWM占空比信号；控制器模块用于捕获所述PWM占空比信号,并用于根据PWM占空比信号调节全桥开关电路模块输出电压电流相位差,使得全桥开关电路模块处于软开关状态。本发明还提供了了一种的相位控制方法,不仅能够实时检测全桥开关电路是否实现软开关状态,还能够进行相位控制以实现软开关。(The invention provides a full-bridge switch circuit voltage and current phase detection device, which is used for a circuit system with a full-bridge switch circuit module, and comprises a phase detection module and a controller module; the phase detection module is used for converting the phase relation between the voltage signal and the current signal at the alternating current side of the full-bridge switch circuit module into a PWM duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation; the controller module is used for capturing the PWM duty ratio signal and adjusting the phase difference of the output voltage and the current of the full-bridge switch circuit module according to the PWM duty ratio signal, so that the full-bridge switch circuit module is in a soft switch state. The invention also provides a phase control method, which not only can detect whether the full-bridge switch circuit realizes the soft switching state in real time, but also can carry out phase control to realize the soft switching.)

1. A full-bridge switch circuit voltage and current phase detection device is used for a circuit system with a full-bridge switch circuit module and is characterized by comprising a phase detection module and a controller module;

the phase detection module is used for converting the phase relation between a voltage signal and a current signal at the alternating current side of the full-bridge switch circuit module into a PWM (pulse-width modulation) duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation;

the controller module is used for capturing the PWM duty ratio signal and adjusting the phase difference of the output voltage and the current of the full-bridge switch circuit module according to the PWM duty ratio signal, so that the full-bridge switch circuit module is in a soft switch state.

2. The voltage-current phase detection device of the full-bridge switch circuit of claim 1, wherein the phase detection module comprises a current signal conditioning circuit module, a reference voltage superposition circuit module, a hysteresis comparison conditioning circuit module, a voltage signal conditioning circuit module and a double rising edge trigger logic conditioning circuit module;

wherein the content of the first and second substances,

the current signal conditioning circuit module is used for scaling the current signal to obtain a first signal and transmitting the first signal to the reference voltage superposition circuit module;

the reference voltage superposition circuit module is used for carrying out reference voltage superposition on the first signal to obtain a second signal and transmitting the second signal to the hysteresis comparison conditioning circuit module;

the hysteresis comparison and conditioning circuit module is used for comparing the second signal with the reference voltage to obtain a first trigger source and transmitting the first trigger source to the double rising edge trigger logic conditioning circuit module;

the voltage signal conditioning circuit module is used for scaling the voltage signal to obtain a second trigger source and transmitting the second trigger source to the double-rising-edge trigger logic conditioning circuit module;

according to the first trigger source and the second trigger source, the double-rising-edge trigger logic conditioning circuit module is used for outputting the PWM duty ratio signal corresponding to the phase relation;

the superimposing includes superimposing the reference voltage that is positive or the reference voltage that is negative.

3. The full-bridge switching circuit voltage-current phase detection device of claim 2, wherein the controller module comprises a duty cycle capture module, a logic judgment control module and a power switch PWM driving control module,

the duty ratio capturing module is used for acquiring the PWM duty ratio signal, converting the PWM duty ratio signal into a PWM duty ratio digital signal and transmitting the PWM duty ratio digital signal to the logic judgment control module;

the logic judgment control module is used for comparing the PWM duty ratio digital signal with a first set value and a second set value and driving the power switch PWM driving control module according to a comparison result;

and judging the driving of the control module according to the logic, wherein the power switch PWM driving control module is used for adjusting the working frequency or phase shift angle of the full-bridge switch circuit module so as to adjust the phase difference of the output voltage and the current of the full-bridge switch circuit module, so that the full-bridge switch circuit module is in a soft switching state.

4. The full-bridge switching circuit voltage-current phase detection device according to claim 3, wherein the circuit system with the full-bridge switching circuit module comprises a vehicle-mounted inductive wireless power transmission system, and the vehicle-mounted inductive wireless power transmission system comprises a ground end and a vehicle-mounted end;

the full-bridge switch circuit module is a ground-end full-bridge inversion module and a vehicle-mounted-end full-bridge rectification module;

the phase detection module is a ground end phase detection module and a vehicle-mounted end phase detection module;

the controller module comprises a ground end controller module and a vehicle-mounted end controller module;

the ground-end full-bridge inverter module, the ground-end controller module and the ground-end phase detection module are positioned at the ground end;

the vehicle-mounted end full-bridge rectification module, the vehicle-mounted end phase detection module and the vehicle-mounted end controller module are positioned at the vehicle-mounted end;

the ground end phase detection module is used for converting the phase relation between the voltage signal and the current signal into a PWM duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation;

the ground-end controller module is used for capturing the PWM duty ratio signal and adjusting the phase difference of the output voltage and the current of the ground-end full-bridge inverter module according to the PWM duty ratio signal, so that the ground-end full-bridge inverter module is in a soft switching state;

the vehicle-mounted end phase detection module is used for converting the phase relation between the voltage signal and the current signal into a PWM duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation;

the vehicle-mounted end controller module is used for capturing the PWM duty ratio signal and adjusting the phase difference of the output voltage and the current of the vehicle-mounted end full-bridge rectification module according to the PWM duty ratio signal, so that the vehicle-mounted end full-bridge rectification module is in a soft switching state.

5. The apparatus according to claim 4, wherein the ground controller module further comprises a ground wireless communication information acquisition module;

the ground end wireless communication information acquisition module is used for receiving the soft switching state of the vehicle-mounted end and transmitting the soft switching state of the vehicle-mounted end to the logic judgment control module;

the logic judgment control module is used for comparing the PWM duty ratio digital signal and the soft switching state of the vehicle-mounted end with a first set value and a second set value and driving the power switch PWM driving control module according to the comparison result;

and according to the comparison result input by the logic judgment control module, the power switch PWM driving control module is used for adjusting the working frequency of the full-bridge switch circuit module so as to adjust the output voltage and current phase difference of the full-bridge switch circuit module, so that the full-bridge switch circuit module is in a soft switching state.

6. The full-bridge switching circuit voltage-current phase detecting device according to claim 4,

the double-rising-edge trigger logic conditioning circuit of the vehicle-mounted end phase detection module comprises a first double-rising-edge trigger logic conditioning circuit and a second double-rising-edge trigger logic conditioning circuit;

the logic judgment control module of the vehicle-mounted end controller module is also used for outputting a third trigger source, and the third trigger source is a fixed duty ratio signal;

the first double-rising-edge trigger logic circuit is used for receiving the first trigger source and the second trigger source, and according to the first trigger source and the second trigger source, the first double-rising-edge trigger logic conditioning circuit is further used for outputting the PWM duty ratio signal corresponding to the phase relationship;

the second double-rising-edge trigger logic conditioning circuit is used for receiving the first trigger source and the third trigger source, and according to the first trigger source and the third trigger source, the second double-rising-edge trigger logic conditioning circuit is further used for outputting the PWM duty cycle signal corresponding to the phase relation.

7. The full-bridge switching circuit voltage-current phase detection device according to claim 6, wherein the hysteresis comparison circuit of the vehicle-mounted end phase detection module is further configured to transmit a first trigger source to the duty cycle capture module of the vehicle-mounted end controller module;

the vehicle-mounted end controller module also comprises a vehicle-mounted end wireless communication information acquisition module, and the vehicle-mounted end wireless communication information acquisition module is used for acquiring the soft switching state information of the ground end and transmitting the soft switching state of the ground end to the logic judgment control module of the vehicle-mounted end controller;

the logic judgment module compares the soft switching state of the ground end, the first trigger source and the PWM duty ratio digital information with a first set value and a second set value and drives the power switch PWM driving control module of the vehicle-mounted end according to a comparison result;

and according to the comparison result input by the logic judgment control module of the vehicle-mounted end, the power switch PWM driving control module of the vehicle-mounted end is used for adjusting the phase shift angle of the full-bridge rectification module of the vehicle-mounted end so as to adjust the output voltage and current phase difference of the full-bridge rectification module of the vehicle-mounted end, so that the full-bridge rectification module of the vehicle-mounted end is in a soft switching state.

8. The full-bridge switching circuit voltage and current phase detection device according to any one of claims 2 to 7, wherein the current signal conditioning circuit module and the voltage signal conditioning circuit module comprise a resistor voltage divider circuit or an operational amplifier circuit.

9. The apparatus according to claim 8, wherein the hysteresis comparison and conditioning circuit module comprises a homodromous hysteresis comparison circuit or an inverting hysteresis comparison circuit.

10. A phase control method for controlling a full-bridge switching circuit module to be in a soft switching state is characterized by comprising the following steps:

the method comprises the following steps: converting the phase relation between the voltage signal and the current signal at the alternating current side of the full-bridge switch circuit module into a PWM duty ratio signal;

step two: and adjusting the voltage and current phase difference output by the full-bridge switch circuit module according to the PWM duty cycle signal, so that the full-bridge switch circuit module is in a soft switching state.

11. The phase control method according to claim 10, wherein the phase control method is used for an on-vehicle inductive wireless power transfer system, the on-vehicle inductive wireless power transfer system comprising an on-vehicle end and a ground end;

the phase control method comprises a vehicle-mounted end phase control method and a ground end phase control method.

12. The phase control method according to claim 11, wherein for the vehicle-mounted terminal phase control method, the second step further includes acquiring a soft switching state of the ground terminal;

and adjusting the phase difference of the output voltage and the current of the full-bridge switch circuit module according to the soft switching state of the ground end and the PWM duty cycle signal, so that the full-bridge switch circuit module is in a soft switching state.

13. The phase control method according to claim 11, wherein for the ground-side phase control method, in the second step, the method further includes obtaining a soft switching state of the vehicle-mounted side;

and adjusting the phase difference of the output voltage and the current of the full-bridge switch circuit module according to the soft switching state of the vehicle-mounted end and the PWM duty cycle signal, so that the full-bridge switch circuit module is in a soft switching state.

Technical Field

The invention relates to the technical field of circuit detection and control, in particular to a voltage and current phase detection device and a phase control method for a full-bridge switching circuit.

Background

In the prior art, the vehicle-mounted inductive wireless power transmission system is rapidly developed by the advantages of convenience in charging, charging safety, environmental adaptability and the like, however, the efficiency of the vehicle-mounted inductive wireless power transmission system is lower than that of a traditional vehicle-mounted charger, and therefore how to improve the efficiency of the vehicle-mounted inductive wireless power transmission system in the prior art is of great importance.

In the prior art, the loss of the vehicle-mounted inductive wireless power transmission system can be divided into two parts, namely the loss of a power electronic component and the loss of a coil component, wherein the loss of a full-bridge switching circuit occupies the main part of the loss of the power electronic component. The inventor of the invention finds out through research that: among the on-vehicle induction type wireless power transmission system among the prior art, full-bridge contravariant and full-bridge rectifier switch control circuit have following two technological shortcomings:

(1) the full-bridge inversion and full-bridge rectification switch control circuit has no phase detection function, so that the phase relation between the alternating-current side voltage and the current of the full-bridge circuit cannot be detected in real time, namely, the phase detection cannot be carried out, and whether the soft switching state of the full-bridge switch circuit is realized under different working conditions cannot be determined;

(2) the voltage and current phase relation of the alternating current side of the full-bridge inversion and full-bridge rectification switch circuit is influenced by the resonance circuit, when the ground end coil and the vehicle-mounted end coil are dislocated, the parameters of the resonance circuit are changed, the voltage and current phase relation of the alternating current side of the full-bridge rectification switch circuit is also changed, the soft switch state of the power switch is further influenced, the transmission efficiency of the system is influenced, and phase control cannot be carried out to realize soft switching.

Disclosure of Invention

The first objective of the present invention is to provide a full-bridge switching circuit voltage and current detection apparatus, which is used for performing phase detection on a full-bridge switching circuit module and controlling the full-bridge switching circuit module to be in a soft switching state under different working conditions.

In order to achieve the purpose, the invention is realized by the following technical scheme: a full-bridge switch circuit voltage and current phase detection device is used for a circuit system with a full-bridge switch circuit module and comprises a phase detection module and a controller module;

the phase detection module is used for converting the phase relation between a voltage signal and a current signal at the alternating current side of the full-bridge switch circuit module into a PWM (pulse-width modulation) duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation;

the controller module is used for capturing the PWM duty ratio signal and adjusting the phase difference of the output voltage and the current of the full-bridge switch circuit module according to the PWM duty ratio signal, so that the full-bridge switch circuit module is in a soft switch state.

Optionally, the phase detection module includes a current signal conditioning circuit module, a reference voltage superposition circuit module, a hysteresis comparison conditioning circuit module, a voltage signal conditioning circuit module, and a double rising edge trigger logic conditioning circuit module;

wherein the content of the first and second substances,

the current signal conditioning circuit module is used for scaling the current signal to obtain a first signal and transmitting the first signal to the reference voltage superposition circuit module;

the reference voltage superposition circuit module is used for carrying out reference voltage superposition on the first signal to obtain a second signal and transmitting the second signal to the hysteresis comparison conditioning circuit module;

the hysteresis comparison and conditioning circuit module is used for comparing the second signal with the reference voltage to obtain a first trigger source and transmitting the first trigger source to the double rising edge trigger logic conditioning circuit module;

the voltage signal conditioning circuit module is used for scaling the voltage signal to obtain a second trigger source and transmitting the second trigger source to the double-rising-edge trigger logic conditioning circuit module;

according to the first trigger source and the second trigger source, the double-rising-edge trigger logic conditioning circuit module is used for outputting the PWM duty ratio signal corresponding to the phase relation;

the superimposing includes superimposing the reference voltage that is positive or the reference voltage that is negative.

Optionally, the controller module comprises a duty ratio capture module, a logic judgment control module and a power switch PWM driving control module,

the duty ratio capturing module is used for acquiring the PWM duty ratio signal, converting the PWM duty ratio signal into a PWM duty ratio digital signal and transmitting the PWM duty ratio digital signal to the logic judgment control module;

the logic judgment control module is used for comparing the PWM duty ratio digital signal with a first set value and a second set value and driving the power switch PWM driving control module according to a comparison result;

and judging the driving of the control module according to the logic, wherein the power switch PWM driving control module is used for adjusting the working frequency or phase shift angle of the full-bridge switch circuit module so as to adjust the phase difference of the output voltage and the current of the full-bridge switch circuit module, so that the full-bridge switch circuit module is in a soft switching state.

Optionally, the circuit system with the full-bridge switch circuit module includes a vehicle-mounted inductive wireless power transmission system, where the vehicle-mounted inductive wireless power transmission system includes a ground end and a vehicle-mounted end;

the full-bridge switch circuit module is a ground-end full-bridge inversion module and a vehicle-mounted-end full-bridge rectification module;

the phase detection module is a ground end phase detection module and a vehicle-mounted end phase detection module;

the controller module comprises a ground end controller module and a vehicle-mounted end controller module;

the ground-end full-bridge inverter module, the ground-end controller module and the ground-end phase detection module are positioned at the ground end;

the vehicle-mounted end full-bridge rectification module, the vehicle-mounted end phase detection module and the vehicle-mounted end controller module are positioned at the vehicle-mounted end;

the ground end phase detection module is used for converting the phase relation between the voltage signal and the current signal into a PWM duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation;

the ground-end controller module is used for capturing the PWM duty ratio signal and adjusting the phase difference of the output voltage and the current of the ground-end full-bridge inverter module according to the PWM duty ratio signal, so that the ground-end full-bridge inverter module is in a soft switching state;

the vehicle-mounted end phase detection module is used for converting the phase relation between the voltage signal and the current signal into a PWM duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation;

the vehicle-mounted end controller module is used for capturing the PWM duty ratio signal and adjusting the phase difference of the output voltage and the current of the vehicle-mounted end full-bridge rectification module according to the PWM duty ratio signal, so that the vehicle-mounted end full-bridge rectification module is in a soft switching state.

Optionally, the ground controller module further includes a ground wireless communication information acquisition module;

the ground end wireless communication information acquisition module is used for receiving the soft switching state of the vehicle-mounted end and transmitting the soft switching state of the vehicle-mounted end to the logic judgment control module;

the logic judgment control module is used for comparing the PWM duty ratio digital signal and the soft switching state of the vehicle-mounted end with a first set value and a second set value and driving the power switch PWM driving control module according to the comparison result;

and according to the comparison result input by the logic judgment control module, the power switch PWM driving control module is used for adjusting the working frequency of the full-bridge switch circuit module so as to adjust the output voltage and current phase difference of the full-bridge switch circuit module, so that the full-bridge switch circuit module is in a soft switching state.

Optionally, the dual-rising edge triggered logic conditioning circuit of the vehicle-mounted terminal phase detection module includes a first dual-rising edge triggered logic conditioning circuit and a second dual-rising edge triggered logic conditioning circuit; the logic judgment control module of the vehicle-mounted end controller module is also used for outputting a third trigger source, and the third trigger source is a fixed duty ratio signal;

the first double-rising-edge trigger logic circuit is used for receiving the first trigger source and the second trigger source, and according to the first trigger source and the second trigger source, the first double-rising-edge trigger logic conditioning circuit is further used for outputting the PWM duty ratio signal corresponding to the phase relationship;

the second double-rising-edge trigger logic conditioning circuit is used for receiving the first trigger source and the third trigger source, and according to the first trigger source and the third trigger source, the second double-rising-edge trigger logic conditioning circuit is further used for outputting the PWM duty cycle signal corresponding to the phase relation.

Optionally, the hysteresis comparison circuit of the on-board terminal phase detection module is further configured to transmit a first trigger source to the duty ratio capture module of the on-board terminal controller module;

the vehicle-mounted end controller module also comprises a vehicle-mounted end wireless communication information acquisition module, and the vehicle-mounted end wireless communication information acquisition module is used for acquiring the soft switching state information of the ground end and transmitting the soft switching state of the ground end to the logic judgment control module of the vehicle-mounted end controller;

the logic judgment module compares the soft switching state of the ground end, the first trigger source and the PWM duty ratio digital information with a first set value and a second set value and drives the power switch PWM driving control module of the vehicle-mounted end according to a comparison result;

and according to the comparison result input by the logic judgment control module of the vehicle-mounted end, the power switch PWM driving control module of the vehicle-mounted end is used for adjusting the phase shift angle of the full-bridge rectification module of the vehicle-mounted end so as to adjust the output voltage and current phase difference of the full-bridge rectification module of the vehicle-mounted end, so that the full-bridge rectification module of the vehicle-mounted end is in a soft switching state.

Optionally, the current signal conditioning circuit module and the voltage signal conditioning circuit module include a resistance voltage divider circuit or an operational amplifier circuit.

Optionally, the hysteresis comparison conditioning circuit module comprises a homodromous hysteresis comparison circuit or an inverting hysteresis comparison circuit.

In order to achieve the second object of the present invention, the present invention provides a phase control method for controlling a full-bridge switching circuit module to be in a soft switching state, including:

the method comprises the following steps: converting the phase relation between the voltage signal and the current signal at the alternating current side of the full-bridge switch circuit module into the PWM duty ratio signal;

step two: and adjusting the voltage and current phase difference output by the full-bridge switch circuit module according to the PWM duty cycle signal, so that the full-bridge switch circuit module is in a soft switching state.

Optionally, the phase control method is applied to a vehicle-mounted inductive wireless power transmission system, where the vehicle-mounted inductive wireless power transmission system includes a vehicle-mounted terminal and a ground terminal; the phase control method comprises a vehicle-mounted end phase control method and a ground end phase control method.

Optionally, for the phase control method of the vehicle-mounted terminal, in the second step, a soft switching state of the ground terminal is obtained; and adjusting the phase difference of the output voltage and the current of the full-bridge switch circuit module according to the soft switching state of the ground end and the PWM duty cycle signal, so that the full-bridge switch circuit module is in a soft switching state.

Optionally, for the ground end phase control method, in the second step, the soft switching state of the vehicle-mounted end is further acquired; and adjusting the phase difference of the output voltage and the current of the full-bridge switch circuit module according to the soft switching state of the vehicle-mounted end and the PWM duty cycle signal, so that the full-bridge switch circuit module is in a soft switching state. .

According to the voltage and current phase detection device of the full-bridge switch circuit, the phase detection module is used for converting the phase relation between the voltage signal and the current signal at the alternating current side of the full-bridge switch circuit module into the PWM duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation, and the controller module adjusts the phase difference of the output voltage and current of the full-bridge switch circuit module according to the PWM duty ratio signal, so that the soft switch state of the full-bridge switch circuit module can be detected in real time.

Drawings

Fig. 1 is a schematic diagram of an overall structure of a full-bridge switching circuit voltage-current phase detection apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a phase detection module and a controller module of a full-bridge switching circuit voltage-current phase detection apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a vehicle-mounted inductive wireless power transmission system having a full-bridge switching circuit voltage-current phase detection apparatus according to a first embodiment of the present invention;

FIG. 4 is a schematic diagram of a voltage-current phase detection device of a full-bridge switch circuit at the ground end of FIG. 3;

FIG. 5 is a schematic structural diagram of a voltage-current phase detection device of a full-bridge switching circuit at the vehicle-mounted end of FIG. 3;

fig. 6 is a waveform diagram of the ac side voltage and current of the on-vehicle full-bridge rectifier switching circuit according to the first embodiment of the invention;

FIG. 7 is a flowchart of a phase control method for a full bridge switching circuit voltage current phase detection apparatus according to the present invention;

fig. 8 is a flowchart of a phase control method of a full-bridge switching circuit voltage-current phase detection apparatus for a ground terminal of a vehicle-mounted wireless power transmission system according to a second embodiment of the present invention;

wherein the reference numerals of figures 1-8 are as follows:

1-ground end phase detection module, 2-ground end controller module, 3-vehicle end controller module, 4-vehicle end phase detection module, 5-ground end PFC output module, 6-ground end full bridge inversion module, 7-ground end resonance topology module, 8-ground coil module, 9-vehicle coil module, 10-vehicle end resonance topology module, 20-vehicle end full bridge rectification module, 30-vehicle end power battery module, 11-ground end voltage signal conditioning circuit module, 12-ground end current signal conditioning circuit module, 13-ground end reference voltage superposition circuit module, 14-ground end hysteresis comparison conditioning circuit module, 15-ground end double rising edge trigger logic conditioning circuit module, 21-ground end wireless communication information acquisition module, 22-ground end duty ratio capturing module, 23-ground end logic judgment control module, 24-ground end power switch PWM driving control module, 41-vehicle-mounted end voltage signal conditioning circuit module, 42-vehicle-mounted end current signal conditioning circuit module, 43-vehicle-mounted end reference voltage superposition circuit module, 44-vehicle-mounted end hysteresis comparison conditioning circuit module, 45-first double-rising edge triggering logic conditioning circuit module, 46-second double-rising edge triggering logic conditioning circuit module, 31-vehicle-mounted end wireless communication information acquisition module, 32-vehicle-mounted end duty ratio capturing module, 33-vehicle-mounted end logic judgment control module and 34-vehicle-mounted end power switch PWM driving control module.

Detailed Description

The core idea of the invention is to solve the problems that the full-bridge inversion and full-bridge rectification switch control circuit in the prior art has no phase detection function and cannot perform phase detection and phase control.

In order to realize the idea, the invention provides a full-bridge switching circuit voltage and current phase detection device, which is used for a circuit system with a full-bridge switching circuit module, and comprises a phase detection module and a controller module;

the phase detection module is used for converting the phase relation between a voltage signal and a current signal at the alternating current side of the full-bridge switch circuit module into a PWM (pulse-width modulation) duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation;

the controller module is used for capturing the PWM duty ratio signal and adjusting the phase difference of the output voltage and the current of the full-bridge switch circuit module according to the PWM duty ratio signal, so that the full-bridge switch circuit module is in a soft switch state.

Wherein the soft switching state is that the corresponding current signal phase lags behind the voltage signal phase; PWM is pulse Width modulation, and the duty cycle of PWM (pulse Width modulation) is the ratio of the time of a square wave high level to the period within one pulse period. For example, the PWM duty cycle of the 1 second high level and the 1 second low level is 50%.

In order to make the objects, advantages and features of the present invention more clear, the voltage and current phase detection apparatus and the phase control method of the full bridge switching circuit proposed by the present invention are further described in detail with reference to fig. 1 to 8. 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.

As shown in fig. 1, the full-bridge switch circuit voltage and current detection apparatus provided by the present invention is used for a system having a full-bridge switch circuit module, and includes a phase detection module and a controller module, wherein the phase detection module obtains a voltage and current signal at an input end or an output end of the full-bridge switch circuit module, the phase detection module converts the voltage signal and the current signal into a PWM duty signal, and transmits the PWM duty signal to the controller module, and the controller module is configured to adjust a voltage and current phase difference output by the full-bridge switch circuit module, so that the full-bridge switch circuit module is in a soft switching state.

Further, as shown in fig. 2, the phase detection module includes a current signal conditioning circuit module, a reference voltage superimposing circuit module, a hysteresis comparison conditioning circuit module, a voltage signal conditioning circuit module, and a double rising edge trigger logic conditioning circuit module.

The current signal conditioning circuit module is used for scaling the acquired current signal to obtain a first signal and transmitting the first signal to the reference voltage superposition circuit module, wherein the first signal is a signal obtained by scaling the current signal; the reference voltage superposition circuit module is used for carrying out reference voltage superposition on the first signal to obtain a second signal and transmitting the second signal to the hysteresis comparison conditioning circuit module, and the second signal is a voltage signal; the hysteresis comparison and conditioning circuit module is used for comparing the second signal with the reference voltage to obtain a first trigger source and transmitting the first trigger source to the double rising edge trigger logic conditioning circuit module, wherein the first trigger source is a square wave signal; the voltage signal conditioning circuit module is used for scaling the voltage signal to obtain a second trigger source and transmitting the second trigger source to the double-rising edge trigger logic conditioning circuit module, and the second trigger source is a scaled voltage signal and is a square wave signal; according to the first trigger source and the second trigger source, the dual rising edge trigger logic conditioning circuit module is configured to output the PWM duty cycle signal corresponding to the phase relationship: when the first trigger source signal is a rising edge, the output of the double-rising-edge trigger logic conditioning circuit module is a rising edge, and when the second trigger source signal is a rising edge, the output of the double-rising-edge trigger logic conditioning circuit module is a falling edge, that is: the phase detection module outputs a signal which is a PWM duty ratio signal corresponding to the phase relation of the voltage and the current. Wherein the superimposing comprises superimposing the reference voltage that is positive or the reference voltage that is negative.

The controller module comprises a duty ratio capturing module, a logic judgment control module and a power switch PWM driving control module. The duty ratio capturing module is used for acquiring the PWM duty ratio signal, converting the PWM duty ratio signal into a PWM duty ratio digital signal and transmitting the PWM duty ratio digital signal to the logic judgment control module; the logic judgment control module is used for comparing the PWM duty ratio digital signal with a first set value and a second set value and driving the power switch PWM driving control module according to the comparison result, wherein the first set value and the second set value are preset values and represent phase difference of voltage and current, and the first set value is larger than the second set value; judging the control module drive according to the logic, the power switch PWM drives the control module and is used for adjusting the operating frequency or phase shift angle of the full-bridge switch circuit module to adjust the output voltage current phase difference of the full-bridge switch circuit module, so that the full-bridge switch circuit module is in a soft switch state: when the phase difference between the voltage and the current is larger than the first set value, the logic judgment control module drives the power switch PWM driving control module to control the full-bridge switch circuit module to maintain the working frequency or the phase shift angle; and when the phase difference between the voltage and the circuit is smaller than the second set value, the power switch PWM driving control module controls the full-bridge switch circuit module to adjust the working frequency or the phase shift angle.

The invention further provides a phase control method for controlling the full-bridge switching circuit module to be in a soft switching state, as shown in fig. 7, the phase control method comprises the following steps:

the method comprises the following steps: converting the phase relation between the voltage signal and the current signal at the alternating current side of the full-bridge switch circuit module into the PWM duty ratio signal;

step two: and adjusting the voltage and current phase difference output by the full-bridge switch circuit module according to the PWM duty cycle signal, so that the full-bridge switch circuit module is in a soft switching state.

The present invention will be described in detail below with reference to a full-bridge switching circuit voltage-current phase detection apparatus and a phase control method applied to a vehicle-mounted inductive wireless power transmission system.

< example one >

As shown in fig. 3, the vehicle-mounted inductive wireless power transmission system with a full-bridge switching circuit voltage-current phase detection device includes a ground terminal and a vehicle terminal.

The ground end comprises a ground end phase detection module 1, a ground end controller module 2, a ground end PFC output module 5, a ground end full-bridge inversion module 6, a ground end resonance topology module 7 and a ground coil module 8, and the vehicle-mounted end comprises a vehicle-mounted end controller module 3, a vehicle-mounted end phase detection module 4, a vehicle-mounted coil module 9, a vehicle-mounted end resonance topology module 10, a vehicle-mounted end full-bridge rectification module 30 and a vehicle-mounted power battery module 20. The ground-end full-bridge inverter module 6 and the vehicle-mounted-end full-bridge rectifier module 30 are full-bridge switch circuit modules; the ground end phase detection module 1 and the vehicle-mounted end phase detection module 4 are the phase detection modules; the ground end controller module 2 and the vehicle end controller module 3 are controller modules. The ground end and the vehicle-mounted end can transmit wireless energy and wireless information.

As shown in fig. 4, which is a schematic structural diagram of the ground-side phase detection module 1 and the ground-side controller module, it can be seen from the diagram that the ground-side phase detection module 1 includes a ground-side voltage signal conditioning circuit module 11, a ground-side current signal conditioning circuit module 12, a ground-side reference voltage superposition circuit module 13, a ground-side hysteresis comparison conditioning circuit module 14, and a ground-side double-rising edge trigger logic conditioning circuit module 15; the ground controller module 2 includes a ground wireless communication information acquisition module 21, a ground duty ratio capture module 22, a ground logic judgment control module 23, and a ground power switch PWM driving control module 24.

The ground end phase detection module 1 is configured to convert a phase relationship between a voltage signal and a current signal into a PWM duty signal, and output the PWM duty signal corresponding to the phase relationship. The specific working process is as follows: the ground terminal voltage signal conditioning circuit module 11 scales the voltage signal at the output end of the ground terminal full-bridge inversion module 6 according to a certain proportion and then inputs the scaled voltage signal to the ground terminal double rising edge trigger logic conditioning circuit module 15 as a second trigger source; the ground end current signal conditioning circuit module 12 scales the current signal at the output end of the ground end full-bridge inverter module 6 according to a certain proportion to obtain a first signal and transmits the first signal to the ground end reference voltage superposition circuit module 13; the ground-side reference voltage superposition circuit module 13 performs reference voltage boosting on the first signal to obtain a second signal, and transmits the second signal to the ground-side hysteresis comparison and conditioning circuit module 14, wherein the ground-side reference voltage superposition circuit module 13 can superpose a positive reference voltage and a negative reference voltage; the ground-side hysteresis comparison and conditioning circuit module 14 compares the second signal with the reference voltage and outputs the second signal to the ground-side double-rising-edge trigger logic conditioning circuit module 15 as a first trigger source. When the first trigger source is a rising edge, the ground-side double rising edge triggers the logic conditioning circuit module 15 to output a rising edge; when the second trigger source is a rising edge, the ground-end double-rising-edge trigger logic conditioning circuit module 15 outputs a falling edge, that is, the output signal of the ground-end phase detection module 1 is a PWM duty ratio signal corresponding to the voltage-current phase relationship.

The ground controller module 2 is configured to capture the PWM duty cycle signal, and adjust an output voltage current phase difference of the ground full-bridge inverter module 6 according to the PWM duty cycle signal. The specific working process is as follows: the ground end duty ratio capturing module 22 converts the PWM duty ratio signal output by the ground end phase detection module 1 into a PWM duty ratio digital signal and transmits the PWM duty ratio digital signal to the ground end logic judgment control module 23; the ground end wireless communication information acquisition module 21 is configured to receive the soft switching state of the vehicle-mounted end and transmit the soft switching state of the vehicle-mounted end to the ground end logic judgment control module 23; the ground logic judgment control module 23 is configured to compare the PWM duty ratio digital signal with a first setting value and a second setting value, and drive the ground power switch PWM driving control module 24 according to the judgment logic: when the PWM duty ratio digital signal is greater than the first set value, the ground logic determination control module 32 drives the ground power switch PWM driving control module 24 to maintain the frequency; when the PWM duty ratio digital signal is smaller than a second set value, the ground logic determination control module 32 drives the ground power switch PWM driving control module 24 to adjust the power; according to the driving of the ground-side logic judgment control module 23, the ground-side power switch PWM driving control module 24 is used to adjust the operating frequency of the ground-side full-bridge inverter module 6.

Wherein, the change of the operating frequency of ground end full-bridge inversion module 6 can receive the total impedance of ground end resonance topology module 7, ground coil module 8, on-vehicle coil module 9 and on-vehicle resonance topology module 10 as shown in fig. 3, the change of total impedance can influence the voltage current phase difference of ground end full-bridge inversion module 6 output, realized promptly that ground end controller module 2 is through adjusting the operating frequency of ground end full-bridge inversion module 6 to adjust the voltage current phase difference of ground end full-bridge inversion module 6 output, in order to adjust the output voltage current phase difference of ground end full-bridge inversion module 6, ensure that ground end full-bridge inversion module 6 is in the soft on-off state.

As shown in fig. 5, which is a schematic structural diagram of the vehicle-mounted end phase detection module 4 and the vehicle-mounted end controller module 3, it can be seen from the diagram that the vehicle-mounted end phase detection module 4 includes a vehicle-mounted end voltage favorite conditioning circuit module 41, a vehicle-mounted end current signal conditioning circuit module 42, a vehicle-mounted end reference voltage superposition circuit module 43, a vehicle-mounted end hysteresis comparison conditioning circuit module 44, a first double rising edge trigger logic conditioning circuit module 45, and a second double rising edge trigger logic conditioning circuit module 46; the vehicle-mounted end controller module 3 comprises a vehicle-mounted end wireless communication information acquisition module 31, a vehicle-mounted end duty ratio capture module 32, a vehicle-mounted end logic judgment control module 33 and a vehicle-mounted end power switch PWM driving control module 34.

The vehicle-mounted end phase detection module 4 is used for converting the phase relation between the voltage signal and the current signal into a PWM duty ratio signal and outputting the PWM duty ratio signal corresponding to the phase relation. The specific working process is as follows: the vehicle-mounted terminal voltage signal conditioning circuit module 41 scales the voltage signal at the input end of the vehicle-mounted terminal full-bridge rectification module 30 according to a certain proportion and then inputs the scaled voltage signal to the first double rising edge trigger logic conditioning circuit module 45 as a second trigger source; the vehicle-mounted end current signal conditioning circuit module 42 scales the current signal at the input end of the vehicle-mounted end full-bridge rectification module 30 according to a certain proportion to obtain a first signal and transmits the first signal to the vehicle-mounted end reference voltage superposition circuit module 43; the vehicle-mounted end reference voltage superposition circuit module 43 performs reference voltage superposition and lifting on the first signal to obtain a second signal, and transmits the second signal to the vehicle-mounted end hysteresis comparison and conditioning circuit module 44, wherein the vehicle-mounted end reference voltage superposition circuit module 43 can superpose positive reference voltage and negative reference voltage; the on-board terminal hysteresis comparison and conditioning circuit module 44 compares the second signal with the reference voltage, and then outputs the second signal to the first double-rising-edge trigger logic conditioning circuit module 45 as a first trigger source, and the second double-rising-edge trigger logic conditioning circuit module 46 as a second trigger source and the on-board terminal duty ratio capturing module 32; meanwhile, the vehicle-mounted end logic judgment control module 33 of the vehicle-mounted end controller module 3 also outputs a third trigger source, wherein the third trigger source is a signal with a fixed duty ratio; and the third trigger source serves as the first trigger source for the second dual rising edge trigger logic conditioning circuit module 46. As a second double rising edge. When the first trigger source is a rising edge, the outputs of the first double-rising-edge trigger logic conditioning circuit module 45 and the second double-rising-edge trigger logic conditioning circuit module 46 are rising edges; when the second trigger source is a rising edge, the output signals of the first double-rising-edge trigger logic conditioning circuit module 45 and the second double-rising-edge trigger logic conditioning circuit module 46 are falling edges, that is, the output signals of the first double-rising-edge trigger logic conditioning circuit module 45 and the second double-rising-edge trigger logic conditioning circuit module 46 are both PWM duty cycle signals, and are output to the vehicle-mounted-end duty cycle capturing module 32 in the vehicle-mounted-end controller module 3.

The vehicle-mounted terminal controller module 3 is configured to capture the PWM duty cycle signal, and adjust the phase difference between the output voltage and the current of the vehicle-mounted terminal full-bridge rectification module 30 according to the PWM duty cycle signal, so that the vehicle-mounted terminal full-bridge rectification module 30 is in a soft-switching state. The specific working process is as follows: the vehicle-mounted end duty ratio capturing module 32 converts the 3 paths of PWM duty ratio signals into corresponding numerical value signals and sends the numerical value signals to the vehicle-mounted end logic judgment control module 33, meanwhile, the vehicle-mounted end wireless communication information acquisition module 31 sends the ground end soft switch state information to the vehicle-mounted end logic judgment control module 33, the vehicle-mounted end logic judgment control module 33 is used for comparing the PWM duty ratio digital signals with a first set value and a second set value and driving the vehicle-mounted end power switch PWM driving control module 34 according to the judgment logic so as to adjust the difference value between the conduction time of the vehicle-mounted end full-bridge rectification module 30 and the zero crossing time of the current signals, the zero crossing time of the current signals cannot be adjusted, and only the conduction time of the vehicle-mounted full-. When the PWM duty ratio digital signal is greater than the first set value, the on-board terminal logic determination control module 33 drives the on-board terminal power switch PWM driving control module 34 to maintain the phase shift angle; when the PWM duty ratio digital signal is smaller than the second set value, the vehicle-mounted end logic judgment control module 33 drives the vehicle-mounted end power switch PWM driving control module 34 to adjust the phase shift angle.

The difference value between the conduction time of the vehicle-mounted end full-bridge rectification module 30 and the zero-crossing time of the current signal can affect the total impedance of the ground end resonance topology module 7, the ground coil module 8, the vehicle-mounted coil module 9 and the vehicle-mounted resonance topology module 10 shown in fig. 3, the change of the total impedance pit can affect the voltage and current phase difference of the alternating current side of the vehicle-mounted end full-bridge rectification module 30, namely, the vehicle-mounted end controller module 3 can adjust the switch conduction time value of the vehicle-mounted end full-bridge rectification module 30 to adjust the voltage and current phase difference of the alternating current side of the vehicle-mounted end rectification module 30, and the vehicle-mounted end full-bridge rectification module 30 is.

It should be noted that both the ground terminal voltage signal conditioning circuit module 11 and the vehicle terminal voltage signal conditioning circuit module 41 are voltage signal conditioning circuit modules, and the voltage signal conditioning circuit modules include a resistance voltage dividing circuit or an operational amplifier circuit; the ground end current signal conditioning circuit module 12 and the vehicle-mounted end current signal conditioning circuit module 42 are both circuit signal conditioning circuit modules, and each current signal conditioning circuit module comprises a resistance voltage division circuit or an operational amplifier circuit; the ground-side reference voltage superposition circuit module 13 and the vehicle-mounted side reference voltage superposition circuit module 43 are both reference voltage superposition circuit modules; the ground-end hysteresis comparison and conditioning circuit module 14 and the vehicle-mounted end hysteresis comparison and conditioning circuit module are hysteresis comparison and conditioning circuit modules, and each hysteresis comparison and conditioning circuit module comprises an equidirectional hysteresis comparison circuit or an opposite-phase hysteresis comparison circuit; the ground-side double-rising-edge trigger logic conditioning circuit module 15, the first double-rising-edge trigger logic conditioning circuit module 45 and the second double-rising-edge trigger logic conditioning circuit module are all double-rising-edge trigger logic conditioning circuit modules; the ground end duty ratio capturing module 22 and the vehicle end duty ratio capturing module 32 are both duty ratio capturing modules; the ground end logic judgment control module 23 and the vehicle end logic judgment control module 33 are both logic judgment control modules; the ground side power switch PWM drive control module 24 and the vehicle side power switch PWM drive control module 34 are according to the vehicle side power switch PWM drive control module.

As shown in fig. 6, which is a voltage-current waveform diagram between the vehicle-mounted-end resonant topology module 10 and the vehicle-mounted-end full-bridge rectification module 30 according to this embodiment, there are three relationships of the voltage-current signals at the ac side of the vehicle-mounted-end full-bridge rectification module 30, which are respectively a non-soft switching state, a transition state, and a soft switching state. Wherein, the phase of the current signal corresponding to the non-soft switching state is ahead of the phase of the voltage signal, the phase of the current signal corresponding to the transition state is the same as the phase of the voltage signal, and the phase of the current signal corresponding to the soft switching state is behind the phase of the voltage signal, as shown in fig. 5, the phase difference between the voltage signal and the circuit signal at the ac side of the on-board terminal full-bridge rectifier module 30 can be converted into the PWM duty cycle signal by the on-board terminal phase detection module 4, and the phase relationship between the current voltage signal and the current signal can be determined by detecting the PWM duty cycle signal, that is: the vehicle-mounted end full-bridge rectification module 30 realizes real-time monitoring of the voltage and current phase relation of the alternating current side, namely the technical defect (1) of the vehicle-mounted end discovered by the inventor through research is overcome.

The voltage and current waveforms between the ground-side full-bridge inverter module 6 and the ground-side resonant topology module 7 are similar to the voltage and current waveforms between the vehicle-side resonant topology module 10 and the vehicle-side full-bridge rectifier module 30, and are not described herein again. As can be understood by those skilled in the art from the above description, the technical deficiency (1) of the ground end found by the research of the inventor is solved by the ground end phase detection module 4.

In addition, for the ground end, the ground end controller module 2 can realize the power soft switching state by controlling the working frequency of the ground end full-bridge inverter module 6; for the vehicle-mounted end, the vehicle-mounted end controller module 3 can realize a power soft switching state by controlling the switching on time of the vehicle-mounted end full-bridge rectification module 30; meanwhile, the ground controller module 2 and the vehicle-mounted controller module 3 can share information through wireless communication to cooperatively control the soft switching state of the full-bridge circuit of the ground end and the vehicle-mounted end, and the technical defect (2) discovered by the inventor through research is overcome.

< example two >

The embodiment provides a phase control method for controlling a full-bridge switching circuit module to be in a soft switching state, including:

the method comprises the following steps: converting the phase relation between the voltage signal and the current signal at the alternating current side of the full-bridge switch circuit module into the PWM duty ratio signal;

step two: and adjusting the voltage and current phase difference output by the full-bridge switch circuit module according to the PWM duty cycle signal, so that the full-bridge switch circuit module is in a soft switching state.

Specifically, the phase control precaution of the embodiment is used for a vehicle-mounted inductive wireless power transmission system, and the vehicle-mounted inductive wireless power transmission system comprises a vehicle-mounted end and a ground end; at the ground end, the phase control method is used to adjust the operating frequency of the ground-end full-bridge inverter module 6, as shown in fig. 8, and includes the following steps:

the method comprises the following steps: converting the phase relation between the voltage signal and the current signal at the alternating current side of the full-bridge switch circuit module into the PWM duty ratio signal;

step two: and acquiring the soft switching state of the vehicle-mounted end, and adjusting the voltage and current phase difference output by the ground-end full-bridge inverter module 6 according to the soft switching state of the vehicle-mounted end and the PWM duty cycle signal, so that the ground-end full-bridge inverter module 6 is in the soft switching state.

Similarly, at the vehicle-mounted end, the phase control method is applied to adjust the operating frequency of the full-bridge rectification module 30 at the vehicle-mounted end, and includes the following steps:

the method comprises the following steps: converting the phase relation between the voltage signal and the current signal at the alternating current side of the full-bridge switch circuit module into the PWM duty ratio signal;

step two: and acquiring the soft switching state of the ground end, and adjusting the voltage and current phase difference output by the vehicle-mounted end full-bridge rectification module 30 according to the soft switching state of the ground end and the PWM duty cycle signal, so that the ground end full-bridge rectification module 30 is in the soft switching state.

In summary, the above embodiments have described in detail various configurations of a full bridge switching circuit voltage and current phase detection apparatus and a phase control method, and it should be 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.