阅读说明：本技术 一种电动汽车无线充放电与定位功能复用装置及其模式切换控制方法 (Electric vehicle wireless charging and discharging and positioning function multiplexing device and mode switching control method thereof ) 是由 王维 张存 许晨进 曾振炜 王劼忞 王�琦 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种电动汽车无线充放电与定位功能复用装置及其模式切换控制方法,适用于电动汽车无线充电定位场景、充电场景以及电网调度场景,通过采集各路信号设置以改变开关触头的连接位置实现功能复用。本发明结构简单,逻辑清晰,通过极少的通信步骤和电子电路器件实现了多功能的复用,辅以监测系统可保证系统安全高效运行；在电动汽车无线V2G等应用场合,本发明实用性高、可实施性强,具有很好的经济性和社会意义。(The invention discloses a wireless charging and discharging and positioning function multiplexing device for an electric automobile and a mode switching control method thereof, which are suitable for wireless charging and positioning scenes, charging scenes and power grid dispatching scenes of the electric automobile, and realize function multiplexing by collecting signal settings of all paths to change the connection position of a switch contact. The invention has simple structure and clear logic, realizes multifunctional multiplexing through few communication steps and electronic circuit devices, and can ensure the safe and efficient operation of the system by being assisted with a monitoring system; in the application occasions of electric automobile wireless V2G and the like, the invention has high practicability and strong implementability and has good economic and social significance.)

1. The utility model provides an electric automobile wireless charging and discharging and multiplexing device of locate function which characterized in that includes: the vehicle-mounted system comprises a receiving coil and two pairs of balance coils, and a transmitting coil is installed at the ground end; balance coil Bx₁,Bx_1’There is a physical connection between them, the balance coil Bx₂,Bx_2’There is also a physical connection between them; each coil loop comprises a tuning capacitor and a current limiting resistor, wherein two balance coil loops are respectively provided with an integratorThe current device is used for outputting differential current signals, the vehicle-mounted end circuit shares the switch circuit, and the ground end is an independent switch circuit.

2. The multiplexing device for wireless charging/discharging and positioning functions of electric vehicle as claimed in claim 1, wherein the receiving coil loop comprises a vehicle-mounted battery, a high-frequency inverter, and a current-limiting resistor R_LTuning capacitor, receiving coil and digital program-controlled switch S₁Wherein, the two ends of the vehicle-mounted battery are connected with the input end of the high-frequency inverter and the current-limiting resistor R_LSerially connected to the output side of the high-frequency inverter, serially connected to the tuning capacitor and the receiving coil, and finally connected to the digital program-controlled switch S₁(ii) a The four balance coil loops comprise sampling resistors R_ACTuning capacitor, balance coil and digital program-controlled switch S₃、S₄、S₅、S₆Wherein in each set of balanced coil loops, a sampling resistor R_ACThe digital program control switch is connected with the tuning capacitor, the corresponding digital program control switch and the balance coil in series; the ground-end transmitting coil loop comprises a high-frequency inverter, a transmitting coil, a tuning capacitor and a digital program-controlled switch S₂The output end of the high-frequency inverter is connected with the tuning capacitor, the transmitting coil and the digital program-controlled switch in series; the initial standby state is S₁Port to d Port, S₂Port is punched to h port, S₃、S₄、S₅、S₆And to the j port.

3. The multiplexing device of wireless charging/discharging and positioning functions of electric vehicle as claimed in claim 1, wherein the multiplexing device comprises three functions of wireless charging, wireless discharging and positioning, wherein the switch action steady state corresponding to the wireless charging function, i.e. G-V mode implementation, is: s₁To port b, S₂To f port, S₃、S₄、S₅、S₆Punching to a j port; the wireless discharge function, i.e., the V-G mode, is: s₁To port c, S₂To g port, S₃、S₄、S₅、S₆Punching to a j port; the positioning function is：S₁To port a, S₂To e port, S₃、S₄、S₅、S₆And then to the i port.

4. The multiplexing device of wireless charging/discharging and positioning functions of electric vehicle as claimed in claim 1, wherein the system is composed of a vehicle-mounted end switch driving protection circuit and a ground end switch driving protection circuit; the vehicle-mounted switch driving protection circuit is controlled by four paths of signals which are a positioning system starting signal controlled by a vehicle owner, a positioning system signal in the working process of the positioning system, a vehicle-mounted battery electric quantity real-time measurement signal and a power grid dispatching communication signal respectively; the transmitting end is provided with three signal sources, namely a charging station charging signal manually started by an owner, a positioning system signal in the working process of a positioning system and a communication signal for power grid dispatching; the signal is processed by corresponding logic topology and then enters the data selector and enters the multi-channel distributor through the bus to control each function switch.

5. A mode switching control method of an electric automobile wireless charging and discharging and positioning function multiplexing device is characterized by comprising the following steps:

(1) for a standby mode, a positioning mode, a G-V mode and a V-G mode, shielding processing needs to be carried out on non-key signal parameters in the corresponding modes or a plurality of signals need to be matched for use so as to realize corresponding functions;

(2) aiming at the switching among a standby mode, a positioning mode, a G-V mode and a V-G mode, the real-time corresponding change processing of a vehicle-mounted end and a ground end is realized, the key parameters of each end are collected to process signals, the switches of the vehicle-mounted end and the ground end are controlled to be matched for use in real time, a functional signal is set to be a corresponding digital signal, the corresponding digital signal is output through a data selector, one branch enters a detection protection device, and the other branch enters a multi-path distributor to select the function;

(3) the terminals of the switch are set accordingly for the needs of standby mode, positioning mode, G-V mode and V-G mode.

6. The mode switching control method of the electric vehicle wireless charging and discharging and positioning function multiplexing device according to claim 5, wherein in the step (3), the mode switching control method of the positioning mode comprises: the main trigger positioning function of the vehicle-mounted terminal vehicle, the positioning signal is high level pulse and is input as I through the vehicle-mounted terminal multipath signal selector₁The output level of the port is a high level signal, the signal outputs a binary level 0010 through the data selector, the switch of the multi-channel distributor is controlled to be turned on to a switch terminal a, and the switch terminal a is connected to the loop; meanwhile, the ground end receives a positioning signal which is a high-level pulse and is input as I through a ground end multipath signal selector₁And the output level of the port is a high level signal, the binary level is 0010 through the data selector, the switch of the multi-channel distributor is controlled to be turned to a switch e terminal, and the switch terminal e is connected to the loop.

7. The mode switching control method of the electric vehicle wireless charging and discharging and positioning function multiplexing device according to claim 5, wherein in the step (3), the switching control method of the G-V mode comprises: the vehicle-mounted terminal vehicle owner sends a charging request to trigger a charging signal, the charging signal is a high-level pulse, the charging signal and a battery electric quantity signal are used as input of a NAND gate A, and output is I through a vehicle-mounted terminal multipath signal selector₂The output level of the port is a high level signal, the output binary level is 0100, a switch of the multi-channel distributor is controlled to be switched to a terminal b of the switch, and the terminal b of the switch is connected into a loop; the ground end receives the charging request and triggers a charging signal, the charging signal is a high-level pulse and is input as I through the ground end multipath signal selector₂And the output level of the port is a high level signal, the binary level of the output signal is 0100 through the data selector, the switch of the multi-channel distributor is controlled to be turned on to the terminal f of the switch, and the terminal f of the switch is connected into the loop.

8. The method for controlling mode switching of the multiplexing device for wireless charging/discharging and positioning functions of electric vehicles according to claim 5, wherein in the step (3), the mode is V-G modeThe switching control method comprises the following steps: the power grid sends out a dispatching instruction, a dispatching instruction signal is triggered, the dispatching instruction signal is a high-level pulse, the instruction signal and a battery electric quantity signal are used as the input of an AND gate B, and the output is I through a vehicle-mounted end multipath signal selector₃The output level of the port is a high level signal, the output binary level is 1000, a switch of the multi-channel distributor is controlled to be switched to a terminal c of the switch, and the terminal c of the switch is connected to the loop; the ground end receives a power grid dispatching instruction and triggers a dispatching instruction signal, the dispatching instruction signal is a high-level pulse and is input as I through a ground end multi-channel signal selector₃And the output level of the port is a high level signal, the binary level of the output signal is 1000 through the data selector, the switch of the multi-channel distributor is controlled to be switched to a terminal g of the switch, and the terminal g of the switch is switched into the loop.

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a wireless charging and discharging and positioning function multiplexing device for an electric automobile and a mode switching control method thereof.

Background

With the continuous progress of the intelligent process, the wireless charging technology of the electric automobile is also increasingly in the field of view of the public. The electric automobile is safe and clean, and can be used as an access source to provide certain margin for power grid dispatching when necessary. However, there is no reliable switch control strategy to switch between functions, so the design and selection of the control strategy for the problem is needed.

The positioning system of the wireless charging technology of the electric automobile belongs to an independent system, if the integration of positioning, charging and power grid scheduling functions can be realized, the service efficiency and the functions of the system can be greatly improved, and therefore corresponding logic functions and switch action modes need to be designed to comprehensively control the functions so as to realize the reusability of the device. Compared with a common mechanical switch, a digital signal circuit is safe and reliable, and therefore the digital signal circuit is often used for controlling an electronic circuit switch. If a switching circuit is provided that combines the advantages of the two strategies, the given function can be realized efficiently, and the complexity of the system and the power consumption of the system are reduced.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a wireless charging and discharging and positioning function multiplexing device for an electric vehicle and a mode switching control method thereof, which have the advantages of simple structure and clear logic, realize multifunctional multiplexing through few communication steps and electronic circuit devices, and can ensure safe and efficient operation of the system by being assisted with a monitoring system.

In order to solve the above technical problem, the present invention provides a wireless charging/discharging and positioning function multiplexing device for an electric vehicle, comprising: the vehicle-mounted system comprises a receiving coil and two pairs of balance coils, and a transmitting coil is arranged at the ground end; balance coil Bx₁,Bx_1’There is a physical connection between them, the balance coil Bx₂,Bx_2’There is also a physical connection between them; each coil loop comprises a tuning capacitor and a current limiting resistor, wherein two balance coil loops are respectively provided with an integratorThe current device is used for outputting differential current signals, the vehicle-mounted end circuit shares the switch circuit, and the ground end is an independent switch circuit.

Preferably, the receiving coil loop comprises a vehicle-mounted battery, a high-frequency inverter and a current-limiting resistor R_LTuning capacitor, receiving coil and digital program-controlled switch S₁Wherein, the two ends of the vehicle-mounted battery are connected with the input end of the high-frequency inverter and the current-limiting resistor R_LSerially connected to the output side of the high-frequency inverter, serially connected to the tuning capacitor and the receiving coil, and finally connected to the digital program-controlled switch S₁(ii) a The four balance coil loops comprise sampling resistors R_ACTuning capacitor, balance coil and digital program-controlled switch S₃、S₄、S₅、S₆Wherein in each set of balanced coil loops, a sampling resistor R_ACThe digital program control switch is connected with the tuning capacitor, the corresponding digital program control switch and the balance coil in series; the ground-end transmitting coil loop comprises a high-frequency inverter, a transmitting coil, a tuning capacitor and a digital program-controlled switch S₂The output end of the high-frequency inverter is connected with the tuning capacitor, the transmitting coil and the digital program-controlled switch in series; the initial standby state is S₁Port to d Port, S₂Port is punched to h port, S₃、S₄、S₅、S₆And to the j port.

Preferably, the multiplexing device includes three functions of wireless charging, wireless discharging and positioning, wherein the wireless charging function (G-V mode) realizes the corresponding switching action steady state as follows: s₁To port b, S₂To f port, S₃、S₄、S₅、S₆Punching to a j port; the wireless discharge function (V-G mode) is: s₁To port c, S₂To g port, S₃、S₄、S₅、S₆Punching to a j port; the positioning function is as follows: s₁To port a, S₂To e port, S₃、S₄、S₅、S₆And then to the i port.

Preferably, the receiving coil loop voltage excitation size U_iSize R of current limiting resistor_L(ii) a Balance coilLoop sampling resistance size R_AC(ii) a Placing design of space position of balance coil and tuning capacitor C of each loop₁、C₂、C₃、C₄、C₅、C₆(ii) a The system consists of a vehicle-mounted end switch driving protection circuit and a ground end switch driving protection circuit; the vehicle-mounted switch driving protection circuit is controlled by four paths of signals which are a positioning system starting signal controlled by a vehicle owner, a positioning system signal in the working process of the positioning system, a vehicle-mounted battery electric quantity real-time measurement signal and a power grid dispatching communication signal respectively; the transmitting end is provided with three signal sources, namely a charging station charging signal manually started by an owner, a positioning system signal in the working process of a positioning system and a communication signal for power grid dispatching; the signal is processed by corresponding logic topology and then enters the data selector and enters the multi-channel distributor through the bus to control each function switch.

Correspondingly, the mode switching control method of the electric automobile wireless charging and discharging and positioning function multiplexing device comprises the following steps:

(1) for a standby mode, a positioning mode, a G-V mode and a V-G mode, shielding processing needs to be carried out on non-key signal parameters in the corresponding modes or a plurality of signals need to be matched for use so as to realize corresponding functions;

(2) aiming at the switching among a standby mode, a positioning mode, a G-V mode and a V-G mode, the real-time corresponding change processing of a vehicle-mounted end and a ground end is realized, the key parameters of each end are collected to process signals, the switches of the vehicle-mounted end and the ground end are controlled to be matched for use in real time, a functional signal is set to be a corresponding digital signal, the corresponding digital signal is output through a data selector, one branch enters a detection protection device, and the other branch enters a multi-path distributor to select the function;

(3) the terminals of the switch are set accordingly for the requirements of standby mode, in positioning mode, G-V mode and V-G mode.

Preferably, in step (3), the method for controlling switching of the positioning mode includes: the main trigger positioning function of the vehicle-mounted terminal vehicle, the positioning signal is high level pulse and is transmitted by the vehicle-mounted terminal multipath signal selectorIs shown as I₁The output level of the port is a high level signal, the signal outputs a binary level 0010 through the data selector, the switch of the multi-channel distributor is controlled to be turned on to a switch terminal a, and the switch terminal a is connected to the loop; meanwhile, the ground end receives a positioning signal which is a high-level pulse and is input as I through a ground end multipath signal selector₁And the output level of the port is a high level signal, the binary level is 0010 through the data selector, the switch of the multi-channel distributor is controlled to be turned to a switch e terminal, and the switch terminal e is connected to the loop.

Preferably, in step (3), the G-V mode switching control method includes: the vehicle-mounted terminal vehicle owner sends a charging request to trigger a charging signal, the charging signal is a high-level pulse, the charging signal and a battery electric quantity signal are used as input of a NAND gate A, and output is I through a vehicle-mounted terminal multipath signal selector₂The output level of the port is a high level signal, the output binary level is 0100, a switch of the multi-channel distributor is controlled to be switched to a terminal b of the switch, and the terminal b of the switch is connected into a loop; the ground end receives the charging request and triggers a charging signal, the charging signal is a high-level pulse and is input as I through the ground end multipath signal selector₂And the output level of the port is a high level signal, the binary level of the output signal is 0100 through the data selector, the switch of the multi-channel distributor is controlled to be turned on to the terminal f of the switch, and the terminal f of the switch is connected into the loop.

Preferably, in step (3), the method for controlling switching of V-G mode: the power grid sends out a dispatching instruction, a dispatching instruction signal is triggered, the dispatching instruction signal is a high-level pulse, the instruction signal and a battery electric quantity signal are used as the input of an AND gate B, and the output is I through a vehicle-mounted end multipath signal selector₃The output level of the port is a high level signal, the output binary level is 1000, a switch of the multi-channel distributor is controlled to be switched to a terminal c of the switch, and the terminal c of the switch is connected to the loop; the ground end receives a power grid dispatching instruction and triggers a dispatching instruction signal, the dispatching instruction signal is a high-level pulse and is input as I through a ground end multi-channel signal selector₃The port outputs a high level signal, and outputs a binary level of 1000 via the data selector to control the demultiplexer to openAnd turning off the switch to a terminal g of the switch, and connecting the terminal g of the switch into a loop.

The invention has the beneficial effects that: (1) the functions are multiplexed, on the premise that the vehicle-mounted end and ground end communication devices are used as few as possible, multiple functions of the electric automobile in the use process can be realized only by one device system, and the role establishment of the electric automobile in a future power grid is promoted; (2) the system is reliable in operation, and false operation prevention and overcurrent prevention protection devices are installed at the vehicle-mounted end and the ground end, so that the system is ensured to operate safely and efficiently; (3) the system is easy to implement, each element contained in the system is a commercially available basic element, the transcoding algorithm is simple, and the difficulty of a design link is low, so that the system is easy to implement; (4) the method has the advantages that multiple functions can be realized by a simple, convenient and reliable method, the key problem faced by the industrialization promotion of the wireless charging system of the electric automobile is solved, the innovative design meets the market requirement under the environment of rapid development of the wireless charging technology, the prospect is wide, the composition structure and the design method are simple and reliable, and the positioning precision is high.

Drawings

FIG. 1 is a circuit diagram of the multi-function multiplexing system of the present invention.

Fig. 2 is a functional diagram of the switch terminal in the system of the present invention.

Fig. 3 is a schematic diagram of a functional flow of the present invention for power consumption.

Fig. 4 is a schematic diagram illustrating a switching process between the working modes of the present invention.

FIG. 5 is a schematic diagram of a vehicle-mounted multi-channel signal selector according to the present invention.

Fig. 6 is a schematic diagram of a ground-side multiplexer according to the present invention.

FIG. 7 is a timing diagram of the switch control of the present invention.

Fig. 8 is a schematic diagram of the switch connection of the receiving coil under each function of the invention.

Fig. 9 is a schematic diagram of the switch connection of the transmitting coil under each function of the invention.

Fig. 10 is a schematic diagram of the balance coil switch connection under each function of the present invention.

Detailed Description

As shown in fig. 1, the on-board positioning system includes a receive coil and four balanced coils aligned two by two. The left and right coils are strictly symmetrical with respect to the receiving coil, and the upper and lower coils are also strictly symmetrical with respect to the receiving coil. When the vehicle-mounted positioning system is aligned with the transmitting coil of the charging potential, the induced currents of the two groups of balance coils are zero. When the vehicle and the transmitting coil have certain offset, the two balance coil loops generate differential current with certain magnitude, and after the differential current is detected by the detection device, the coil positioning under the precision is completed corresponding to the offset distance and the database of the checking and distinguishing distance. A receiving coil and a balance coil loop in a vehicle-mounted receiving end share a digital program control switch, wherein the digital program control switch contacts of the receiving coil loop are divided into a, b, c and d which respectively correspond to a positioning mode, a G-V mode, a V-G mode and a standby mode, and the digital program control switch contacts of the balance coil loop are h and i which respectively correspond to the positioning mode and the standby mode; the digital program control switch contact branches e, f and G of the transmitting coil loop respectively correspond to a standby mode, a G-V mode and a V-G mode.

As shown in fig. 2, the corresponding function of the contacts of each switch is demonstrated.

As shown in fig. 3, it is proposed that the electric energy change in each function time in an ideal state is applied to the battery electric energy of the system. On the graph can be derived:

1. when the electric quantity of the electric automobile is insufficient, an electric quantity insufficiency alarm signal is provided for a driver, the driver is guided to a nearest charging station, and at the moment, a switch of a vehicle-mounted end system is in a d port (standby mode);

2. after entering a charging station, a vehicle owner turns on a charging system, a vehicle-mounted system switch is turned to an a port (a positioning mode), a balance coil system switch is turned to an h port (a positioning mode) for positioning on the line of the great force system, after positioning is finished, the vehicle-mounted system switch is automatically turned to a b port (a G-V mode), and the balance coil system switch is turned to an i port (a standby mode);

3. after a charging instruction of a vehicle owner in a charging station is received, a loop switch of a transmitting coil is switched to an f port (G-V mode), a vehicle-mounted signal detects current change, a loop switch of a receiving coil detects a current signal, the on-off state is maintained, the whole system enters the G-V mode to start charging, and the electric quantity of a battery rises;

4. after charging is finished, the battery electric quantity signal shows that the battery is fully charged, a loop switch of the vehicle-mounted receiving coil is switched to a port d (standby state), a loop of the transmitting coil senses current change, and a loop switch is switched to a port e (standby mode);

5. if the power grid needs, transmitting a power grid dispatching signal to the vehicle-mounted communication end and the ground coil communication end, respectively turning over the c port (V-G mode) and the e port (V-G mode) by the switch circuit, after the transmission is finished, releasing the dispatching signal by the power grid, and returning the switch circuit to the standby mode.

As shown in fig. 4, the switching conditions and applicable scenarios between the respective modes are superseded.

As shown in fig. 5 and fig. 6, the logic topologies of the receiving coil loop digital program-controlled switch and the transmitting coil loop digital program-controlled switch, and the signal processing and detecting, switching control circuits thereof are respectively given. High and low level signals in the logic topology enter a data selector, one branch of the output digital quantity enters a monitoring unit for abnormal condition monitoring, and the other branch of the output digital quantity enters a multi-way distributor for switch control.

As shown in FIG. 7, the method is directed to the vehicle-mounted terminal S₁And a ground end S₂The signal timing control chart of the switch can control and complete the functions and conversion according to the timing.

As shown in fig. 8, fig. 9 and fig. 10, the functions corresponding to the terminals of the digital program controlled switch of the receiving coil loop, the transmitting coil loop and the balance coil loop are respectively shown.