阅读说明：本技术 动态无线供电系统的漏磁场调控系统及方法 (Leakage magnetic field regulation and control system and method of dynamic wireless power supply system ) 是由 赵金晓 潘峰 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种动态无线供电系统的漏磁场调控系统及方法,其中,该系统包括：高频逆变器用于产生高频交变电流为地面发射线圈供电；地面发射线圈用于根据高频交变电流产生高频交变磁场,以向车载接收线圈传输能量；切换开关矩阵用于控制地面发射线圈的导通方式,令不同段地面发射线圈进入开启或待机工作模式；发射端补偿电容用于补偿地面发射线圈中的无功能量；车载接收线圈安装于车辆底部,用于拾取地面发射线圈在空间中激发的高频交变磁场,并产生感应电压为车载电池供电；地面雷达发射装置用于发射信号检测车辆的位置。该系统可实时对发射线圈产生的漏磁场进行调控,有效地消除车辆外侧区域产生的漏磁辐射,提高系统的电磁兼容性和安全性。(The invention discloses a leakage magnetic field regulation and control system and a method of a dynamic wireless power supply system, wherein the system comprises: the high-frequency inverter is used for generating high-frequency alternating current to supply power to the ground transmitting coil; the ground transmitting coil is used for generating a high-frequency alternating magnetic field according to the high-frequency alternating current so as to transmit energy to the vehicle-mounted receiving coil; the switch matrix is used for controlling the conduction mode of the ground transmitting coil, so that different sections of the ground transmitting coil enter an opening or standby working mode; the transmitting terminal compensation capacitor is used for compensating reactive energy in the ground transmitting coil; the vehicle-mounted receiving coil is arranged at the bottom of a vehicle and used for picking up a high-frequency alternating magnetic field excited by the ground transmitting coil in space and generating induction voltage to supply power to a vehicle-mounted battery; the ground radar transmitting device is used for transmitting signals to detect the position of the vehicle. The system can regulate and control the leakage magnetic field generated by the transmitting coil in real time, effectively eliminate the leakage magnetic radiation generated in the outer area of the vehicle and improve the electromagnetic compatibility and the safety of the system.)

1. The utility model provides a dynamic wireless power supply system's leakage magnetic field regulation and control system which characterized in that includes: a high-frequency inverter (1), a ground transmitting coil (2), a switch matrix (3), a transmitting terminal compensation capacitor (4), a vehicle-mounted receiving coil (5) and a ground radar transmitting device (6),

the high-frequency inverter (1) is arranged at a road surface transmitting end and used for generating high-frequency alternating current to supply power to the ground transmitting coil (2);

the ground transmitting coil (2) is used for generating a high-frequency alternating magnetic field according to the high-frequency alternating current so as to transmit energy to the vehicle-mounted receiving coil (5);

the change-over switch matrix (3) is used for controlling the conduction mode of the ground transmitting coil (2) so as to change the commutation of the current in the ground transmitting coil (2) and enable different sections of the ground transmitting coil (2) to enter an on or standby working mode, wherein the change-over switch matrix (3) is provided with No. 1 to No. n change-over switches;

the transmitting terminal compensation capacitor (4) is used for compensating reactive energy in the ground transmitting coil (2);

the vehicle-mounted receiving coil (5) is arranged at the bottom of a vehicle and used for picking up a high-frequency alternating magnetic field excited by the ground transmitting coil (2) in space and generating induction voltage to supply power to a vehicle-mounted battery;

the ground radar transmitting device (6) is arranged at the center position of the ground transmitting coil (2) and used for transmitting signals to detect the position of a vehicle.

2. The leakage magnetic field regulation system of the dynamic wireless power supply system according to claim 1, wherein the output frequency of the high frequency inverter (1) is 10kHz to 200 kHz.

3. The leakage magnetic field regulation and control system of the dynamic wireless power supply system according to claim 1, wherein the ground transmitting coil (2) is a long straight coil structure, and the number of coil turns is 2N_pWherein N is_pIs a positive integer, and the number of turns of the outer ring transmitting coil and the number of turns of the inner ring transmitting coil are both N_p。

4. The leakage magnetic field regulation and control system of the dynamic wireless power supply system according to claim 3, wherein the outer ring of the transmitting coil is connected with the transmitting coil of the inner ring through the No. 1 switch, the ground transmitting coil (2) is equally distributed into N sections according to the total length of the ground transmitting coil (2), and the inner rings of the transmitting coils at two adjacent ends are connected through one switch.

5. The leakage magnetic field regulation and control system of the dynamic wireless power supply system according to claim 1, wherein each switch in the switch matrix (3) comprises 2 positive switches (31), 2 positive switch compensation capacitors (33) and 2 negative switches (32), wherein each positive switch (31) and each negative switch (32) are formed by connecting 2 MOSFET switches in parallel in an opposite direction; the forward switch compensation capacitor (33) is used for compensating the self-inductance of the ground transmitting coil in the current section; the forward switch (31) is connected with the forward switch compensation capacitor (33) and then is connected in series to enter the inner ring transmitting coil; the negative switch (32) is connected in parallel in the inner ring transmitting coil; and only one group of the positive switch (31) and the negative switch (32) is conducted at the same time.

6. The leakage magnetic field regulation and control system of the dynamic wireless power supply system according to claim 1, wherein the number of the ground radar transmitting devices (6) is N, the N ground radar transmitting devices are uniformly distributed at the center position of each section of ground transmitting coil, and the position of the vehicle is detected by using the high-frequency alternating current generated by the ground transmitting coil (2).

7. The leakage magnetic field regulation system of a dynamic wireless power supply system according to claim 1,

when a forward switch (31) of the change-over switch matrix (3) is switched on, the direction of current in the inner-ring transmitting coil is kept unchanged, the directions of current in the inner-ring transmitting coil and the outer-ring transmitting coil are the same, and main magnetic flux is generated to be led to a vehicle-mounted receiving coil (5) for supplying power;

when the negative switch of the change-over switch matrix (3) is switched on, the current in the inner ring transmitting coil is reversed, the directions of the currents in the inner ring transmitting coil and the outer ring transmitting coil are opposite, magnetic fields are generated to be mutually offset in space, and magnetic leakage radiation cannot be generated.

8. The leakage magnetic field regulation and control system of the dynamic wireless power supply system according to claim 1, characterized in that when the vehicle travels to the area above the first section of ground transmitting coil, the negative switch (32) of the switch No. 2 and the switch No. 1 are turned on, and the positive switch (31) of the switch No. 3 to the switch No. n is turned on, so that the direction of the current in the inner transmitting coil of the section 1 ground transmitting coil is kept unchanged, the direction of the current in the inner transmitting coil and the outer transmitting coil is the same, and a main magnet is generated to be led to the receiving coil for power supply; the directions of currents in the inner ring transmitting coil and the outer ring transmitting coil in the 2 nd to the N-th transmitting coils are opposite, the generated magnetic fields are mutually offset in the space, and magnetic leakage radiation cannot be generated.

9. The leakage magnetic field regulation and control system of the dynamic wireless power supply system according to claim 1, characterized in that when a vehicle runs to a region above the i-th section (i is not less than 2 and not more than n-1) of the transmitting coil, the switch 1 is turned on, the negative switch (32) in the switch i and the switch (i +1) is turned on, and the positive switches (31) in the other switches are turned on, so that the current direction in the inner-ring transmitting coil in the i-th section of the transmitting coil is kept unchanged, the current directions in the inner-ring transmitting coil and the outer-ring transmitting coil are the same, and a main magnet is generated to supply power to the receiving coil; the directions of currents in the inner ring transmitting coil and the outer ring transmitting coil in the other transmitting coils are opposite, magnetic fields generated are mutually offset in space, and magnetic leakage radiation cannot be generated.

10. A method for regulating and controlling a leakage magnetic field of a dynamic wireless power supply system, based on any one of claims 1 to 9, comprising the steps of:

step S1, initializing after receiving a vehicle pre-charging signal, enabling the high-frequency inverter (1) to start supplying power, closing positive switches and negative switches in all the transfer switches, and enabling no current to flow in the ground transmitting coil (2);

step S2, sending a detection signal by using the ground radar sensing device to detect the current position of the vehicle;

step S3, judging whether the current position of the vehicle is driven out of a charging area, if so, closing the high-frequency inverter (1), and ending charging; otherwise, marking the area of the vehicle in the ith ground transmitting coil according to the current position of the vehicle, wherein i is 1,2 … N, and performing step S4;

step S4, according to the relative position of the vehicle and the ground transmitting coil (2), controlling the No. 1 to No. n ground switches in the switch matrix (3):

if i is 1, turning on 2 negative switches in the No. 2 change-over switches, and simultaneously turning on the positive switches in the rest No. 1 change-over switches and the No. 3 to No. n change-over switches; at the moment, the 1 st section of ground transmitting coil enters an opening mode, the transmitting current directions in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated;

if i is more than or equal to 2 and less than or equal to N-1, turning on the No. 1 change-over switch, 2 negative direction switches in the No. i change-over switch and the No. i +1 change-over switch, and simultaneously turning on the positive direction switches in the other change-over switches; at the moment, the ith section of ground transmitting coil enters an opening mode, the directions of transmitting currents in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated;

if i is equal to N,2 negative switches in the No. 1 change-over switch and the No. N change-over switch are switched on, and meanwhile, positive switches in the rest change-over switches are switched on; at the moment, the N section of ground transmitting coil enters an opening mode, the transmitting current directions in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated;

step S5, when the ith section of ground transmitting coil enters the starting mode, the rest sections of ground transmitting coils enter the standby mode, and after the power is continuously supplied for m seconds, wherein m is equal to the ratio of the length of the single section of ground transmitting coil to the average running speed of the vehicle; and iterating the steps S2 to S5 until the vehicle travels out of the charging area or receives a stop charging signal.

Technical Field

The invention relates to the technical field of wireless charging, in particular to a leakage magnetic field regulation and control system and method of a dynamic wireless power supply system.

Background

The electric vehicle, as a representative of new energy vehicles, has become a mainstream scheme for effectively solving environmental pollution and oil crisis recognized by manufacturers and research institutions at home and abroad by virtue of zero emission, flexible operability and high efficiency. At the present stage, the bottleneck limiting the large-scale popularization and application of the electric automobile is the shortage of the energy density of a vehicle-mounted battery, and the electric automobile cannot fundamentally replace the traditional internal combustion engine automobile due to the short endurance mileage. The dynamic wireless charging technology is provided, so that the electric automobile is free from the constraint of charging piles, the charging in the advancing process of the automobile can be realized, the cruising mileage of the automobile is greatly improved, and the possibility of comprehensively replacing the traditional internal combustion engine automobile is provided for the electric automobile.

In the dynamic wireless power supply system, the long guide rail type structure has the advantages of simple structure, low cost and small number of inversion sources, and has great advantages in the aspect of large-scale application. However, in this type of structure, the whole section of the transmitting coil is powered simultaneously, and except for the area where the vehicle to be charged is located, a high-frequency alternating magnetic field is generated above the whole charging road. The magnetic field in the region below the vehicle is generally referred to as the main magnetic field, and the magnetic field in the region outside the vehicle is generally referred to as the leakage magnetic field. On the one hand, the mode of whole section power supply can produce great magnetic leakage radiation, produces serious electromagnetic radiation to pedestrian and other biology near the highway, and simultaneously, when the road surface had the metallic foreign object, the high frequency magnetic leakage field still can produce eddy current loss in the metallic foreign object, heats the metal, causes potential threat. Therefore, in the dynamic wireless power supply system, the regulation and control strategy of the leakage magnetic field is called as a key problem to be solved urgently in the dynamic wireless charging system.

In order to solve the above-mentioned shortcomings, various research institutes at home and abroad have conducted many researches on the side shift problem and the position self-alignment method in the wireless charging system of the electric vehicle. Research teams In Onar O C, Miller J M, Campbell S L, et al. A Novel Wireless Power Transfer for In-Motion EV/PHEV steering [ C ]// annular IEEE Applied Power Electronics Conference and Exposion (APEC). NEW YORK: IEEE,2013:3073-3080 ] propose to electromagnetically shield the leakage magnetic field generated by the transmitting coil with 1mm thick aluminum plates on both sides of the transmitting coil, however, this method requires a large number of shielding aluminum plates to be laid along the Charging path, which has the disadvantage of being too costly. The method for installing a horizontal shielding belt at the outer edge of a transmitting end in a mode of better reducing the magnetic leakage radiation generated by a transmitting coil is proposed in the document of the institute of electricians of Chinese academy of sciences [ Zhu Qing, Chen De Qing, Wang Li Fang, and the like ] research on magnetic field simulation and shielding technology of an electric vehicle wireless charging system [ J ] the report of electrician technology, 2015(S1): 143-. The method also has the defect of high cost, and the mode of laying the shielding crawler belts on the two sides of the road surface also increases the construction difficulty and the construction cost. The document Nagendra G R, Covic G A, Boys J T.sizing of Inductive Power loads for Dynamic steering of EVs on IPT high ways [ J ]. IEEE Transactions on transmission electric configuration, 2017, PP (99):1 ] adopts an array type transmitting coil mode to reduce leakage radiation, and only one or more transmitting coils in the area below the vehicle are opened to carry out wireless Power supply by detecting the position of the vehicle. In the working process of the system, the transmitting coil in the outer area of the vehicle is in a closed state, and no magnetic leakage radiation is generated. However, in the method, independent inversion sources need to be equipped for each transmitting coil for independent control, so that the number of high-frequency inversion sources required by the system is too large, and the system cost is greatly increased. Patent CN 107786005a proposes a double-layer shielding receiver device to reduce the leakage radiation, but this method can only shield the leakage field in the region where the receiver is located, and does not shield the leakage field in the outside region of the vehicle.

Disclosure of Invention

The invention provides a leakage magnetic field regulation and control system and method of a dynamic wireless power supply system, which are used for solving the technical problems of high cost and high construction difficulty when the leakage magnetic field radiation problem is processed in the conventional dynamic wireless power supply system.

An embodiment of an aspect of the present invention provides a leakage magnetic field regulation and control system for a dynamic wireless power supply system, including: the system comprises a high-frequency inverter (1), a ground transmitting coil (2), a change-over switch matrix (3), a transmitting end compensation capacitor (4), a vehicle-mounted receiving coil (5) and a ground radar transmitting device (6), wherein the high-frequency inverter (1) is mounted at a road surface transmitting end and used for generating high-frequency alternating current to supply power to the ground transmitting coil (2); the ground transmitting coil (2) is used for generating a high-frequency alternating magnetic field according to the high-frequency alternating current so as to transmit energy to the vehicle-mounted receiving coil (5); the change-over switch matrix (3) is used for controlling the conduction mode of the ground transmitting coil (2) so as to change the commutation of the current in the ground transmitting coil (2) and enable different sections of the ground transmitting coil (2) to enter an on or standby working mode, wherein the change-over switch matrix (3) is provided with No. 1 to No. n change-over switches; the transmitting terminal compensation capacitor (4) is used for compensating reactive energy in the ground transmitting coil (2); the vehicle-mounted receiving coil (5) is arranged at the bottom of a vehicle and used for picking up a high-frequency alternating magnetic field excited by the ground transmitting coil (2) in space and generating induction voltage to supply power to a vehicle-mounted battery; the ground radar transmitting device (6) is arranged at the center position of the ground transmitting coil (2) and used for transmitting signals to detect the position of a vehicle.

Another embodiment of the present invention provides a leakage magnetic field regulation and control system based on the above dynamic wireless power supply system, including the following steps:

step S1, initializing after receiving a vehicle pre-charging signal, enabling the high-frequency inverter (1) to start supplying power, closing positive switches and negative switches in all the transfer switches, and enabling no current to flow in the ground transmitting coil (2);

step S2, sending a detection signal by using the ground radar sensing device to detect the current position of the vehicle;

step S3, judging whether the current position of the vehicle is driven out of a charging area, if so, closing the high-frequency inverter (1), and ending charging; otherwise, marking the area of the vehicle in the ith ground transmitting coil according to the current position of the vehicle, wherein i is 1,2 … N, and performing step S4;

step S4, according to the relative position of the vehicle and the ground transmitting coil (2), controlling the No. 1 to No. n ground switches in the switch matrix (3):

if i is 1, turning on 2 negative switches in the No. 2 change-over switches, and simultaneously turning on the positive switches in the rest No. 1 change-over switches and the No. 3 to No. n change-over switches; at the moment, the 1 st section of ground transmitting coil enters an opening mode, the transmitting current directions in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated;

if i is more than or equal to 2 and less than or equal to N-1, turning on the No. 1 change-over switch, 2 negative direction switches in the No. i change-over switch and the No. i +1 change-over switch, and simultaneously turning on the positive direction switches in the other change-over switches; at the moment, the ith section of ground transmitting coil enters an opening mode, the directions of transmitting currents in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated;

if i is equal to N,2 negative switches in the No. 1 change-over switch and the No. N change-over switch are switched on, and meanwhile, positive switches in the rest change-over switches are switched on; at the moment, the N section of ground transmitting coil enters an opening mode, the transmitting current directions in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated;

step S5, when the ith section of ground transmitting coil enters the starting mode, the rest sections of ground transmitting coils enter the standby mode, and after the power is continuously supplied for m seconds, wherein m is equal to the ratio of the length of the single section of ground transmitting coil to the average running speed of the vehicle; and iterating the steps S2 to S5 until the vehicle travels out of the charging area or receives a stop charging signal.

The technical scheme of the invention at least realizes the following beneficial technical effects: the leakage magnetic field generated by the transmitting coil can be regulated and controlled in real time, and in the process of dynamic wireless power supply of the vehicle, the leakage magnetic radiation generated in the outer area of the vehicle can be effectively eliminated without extra shielding materials, so that the electromagnetic compatibility and the safety of the system are improved; according to the strategy, by utilizing the ground monitoring radar and the change-over switch, only the transmitting coil below the vehicle is in an opening mode in the moving process of the vehicle, the current directions of all turns of coils in the section of the transmitting coil are enabled to be the same, and a high-frequency magnetic field is generated to carry out wireless energy transmission; the transmitting coil in the outer area of the vehicle is in a standby mode, the current directions of all turns of coils in the transmitting coil are reversed, magnetic fields generated in the space are mutually offset, and further the effect of eliminating a leakage magnetic field is realized; compared with the existing leakage magnetic field shielding scheme, the invention is provided with an independent high-frequency inversion source for each section of transmitting coil, and the transmitting coil in the whole process only needs a single inversion source for power supply; meanwhile, horizontal shielding belts or shielding aluminum plates do not need to be installed on two sides of the transmitting end, the purpose of magnetic field regulation and control can be achieved only by a plurality of change-over switches, the system cost can be effectively reduced, the construction difficulty is reduced, and the engineering practical value is high.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a leakage magnetic field regulation and control system of a dynamic wireless power supply system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of each diverter switch of one embodiment of the present invention;

FIG. 3 is a schematic diagram showing the conduction mode and the direction of the transmission current of the switch when the vehicle is located in the region of the segment 1 transmission coil;

FIG. 4 is a schematic diagram illustrating the conduction mode and the transmission current direction of the switch when the vehicle is located in the i-th section of the transmission coil area;

FIG. 5 is a schematic diagram showing the conducting mode and the transmitting current direction of the switch when the vehicle is located in the region of the Nth segment of the transmitting coil;

FIG. 6 is a schematic diagram of the direction of the transmitting current and the magnetic field distribution generated by the transmitting coil when the ground transmitting coil enters the on mode;

FIG. 7 is a diagram illustrating the direction of the transmitting current and the magnetic field distribution generated by the transmitting coil when the transmitting coil enters the standby mode;

fig. 8 is a control flowchart of a leakage magnetic field regulation method of a dynamic wireless power supply system according to an embodiment of the present invention.

Description of reference numerals:

100-leakage magnetic field regulation and control system, 1-high frequency inverter, 2-ground transmitting coil, 3-change-over switch matrix, 31-positive switch, 32-negative switch, 33-positive switch compensation capacitor, 4-transmitting end compensation capacitor, 5-vehicle-mounted receiving coil and 6-ground radar transmitting device.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The leakage magnetic field regulation and control system and method of the dynamic wireless power supply system according to the embodiment of the present invention are described below with reference to the accompanying drawings, and first, the leakage magnetic field regulation and control system of the dynamic wireless power supply system according to the embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a leakage magnetic field regulation and control system of a dynamic wireless power supply system according to an embodiment of the present invention.

As shown in fig. 1, the leakage magnetic field regulation system 100 includes: the device comprises a high-frequency inverter (1), a ground transmitting coil (2), a change-over switch matrix (3), a transmitting end compensation capacitor (4), a vehicle-mounted receiving coil (5) and a ground radar transmitting device (6).

The high-frequency inverter (1) is arranged at a road surface transmitting end and used for generating high-frequency alternating current to supply power to the ground transmitting coil (2). The ground transmitting coil (2) is used for generating a high-frequency alternating magnetic field according to the high-frequency alternating current so as to transmit energy to the vehicle-mounted receiving coil. The change-over switch matrix (3) is used for controlling the conduction mode of the ground transmitting coil (2) so as to change the commutation of the current in the ground transmitting coil (2) and enable the ground transmitting coils (2) of different sections to enter an opening or standby working mode, wherein the change-over switch matrix (3) is provided with No. 1 to No. n change-over switches. And the transmitting terminal compensation capacitor (4) is used for compensating reactive energy in the ground transmitting coil 1. The vehicle-mounted receiving coil (5) is arranged at the bottom of the vehicle and used for picking up a high-frequency alternating magnetic field excited in the space by the ground transmitting coil (2) and generating an induced voltage to supply power for a vehicle-mounted battery. The ground radar transmitting device (6) is arranged at the central position of the ground transmitting coil 1 and used for transmitting signals to detect the position of the vehicle.

Further, the output frequency of the high-frequency inverter (1) is 10 kHz-200 kHz.

Furthermore, the ground transmitting coil (2) is of a long straight coil structure, and the number of turns of the coil is 2N_pWherein N is_pIs a positive integer, and the number of turns of the outer ring transmitting coil and the number of turns of the inner ring transmitting coil are both N_pThe outer ring transmitting coil is connected with the inner ring transmitting coil through a No. 1 change-over switch; and according to the total length of the transmitting coils, the transmitting coils are evenly distributed into N sections, and the adjacent transmitting coils at the inner rings at two ends are connected through a change-over switch.

Further, as shown in fig. 2, each of the switches in the switch matrix (3)3 includes 2 positive switches (31), 2 positive switch compensation capacitors (33), and 2 negative switches (32). Each positive switch (31) and each negative switch (32) are formed by connecting 2 MOSFET switches in parallel in the reverse direction; the forward switch compensation capacitor (33) is used for compensating the self-inductance of the ground transmitting coil (2) at the current section; the forward switch (31) is connected with a forward switch compensation capacitor (33) and then is connected in series to enter the inner ring transmitting coil; the negative switch (32) is connected in parallel in the inner ring transmitting coil; only one group of the positive switch (31) and the negative switch (32) are conducted at the same time.

Furthermore, the number of the ground radar transmitting devices (6) is N, the N ground radar transmitting devices are uniformly distributed at the central position of each section of ground transmitting coil, and the position of the vehicle is detected by using high-frequency alternating current generated by the ground transmitting coil (2).

Specifically, the specific working principle of the leakage magnetic field regulation and control system of the dynamic wireless power supply system provided by the invention is as follows:

as shown in fig. 3, when the vehicle travels to the area above the 1 st section of ground transmitting coil, the negative switch (32) of the switch 2 and the positive switch (31) of the switch 1 to the n are turned on, then the direction of the current in the inner-ring transmitting coil in the 1 st section of ground transmitting coil is kept unchanged, the direction of the current in the inner-ring transmitting coil and the outer-ring transmitting coil is the same, and main magnetic flux is generated to be led to the vehicle-mounted receiving coil (5) for supplying power; the directions of currents in the inner ring transmitting coil and the outer ring transmitting coil in the 2 nd to the N-th transmitting coils are opposite, the generated magnetic fields are mutually offset in the space, and magnetic leakage radiation cannot be generated.

As shown in fig. 4, when the vehicle travels to the area above the i-th section (i is not less than 2 and not more than N-1) of the ground transmitting coil, the switch 1, the negative switch (32) in the switch i and the switch (i +1) are turned on, and the positive switches (31) in the other switches are turned on, so that the current direction in the inner-ring transmitting coil in the i-th section of the ground transmitting coil is kept unchanged, the current directions in the inner-ring transmitting coil and the outer-ring transmitting coil are the same, and main magnetic flux is generated to be led to the vehicle-mounted receiving coil (5) for supplying power; the directions of currents in the inner ring transmitting coil and the outer ring transmitting coil in the rest sections of ground transmitting coils are opposite, magnetic fields generated are mutually offset in space, and magnetic leakage radiation cannot be generated.

As shown in fig. 5, when the vehicle travels to the area above the nth section (last section) of transmitting coil, the negative switch (32) of the 1 st switch and the N st switch is turned on, and the positive switches (31) of the rest switches are turned on, so that the current direction in the inner-ring transmitting coil in the nth section of ground transmitting coil is kept unchanged, the current directions in the inner-ring transmitting coil and the outer-ring transmitting coil are the same, and main magnetic flux is generated to lead to the vehicle-mounted receiving coil (5) for supplying power; the directions of currents in the inner ring transmitting coil and the outer ring transmitting coil in the rest sections of ground transmitting coils are opposite, magnetic fields generated are mutually offset in space, and magnetic leakage radiation cannot be generated.

Further, as shown in fig. 6, for each segment of ground transmitting coil (2), when the forward switch (31) is turned on, the direction of the current in the inner transmitting coil is kept unchanged, the direction of the current in the inner transmitting coil is the same as that of the outer transmitting coil, and a main magnetic flux is generated to supply power to the receiving coil; as shown in fig. 7, when the negative switch (32) is turned on, the current in the inner-ring transmitting coil is reversed, and the directions of the currents in the inner-ring transmitting coil and the outer-ring transmitting coil are opposite, so that magnetic fields are generated to cancel each other in space, and no leakage radiation is generated.

To sum up, the leakage magnetic field regulation and control system of the dynamic wireless power supply system provided by the embodiment of the invention utilizes the ground monitoring radar and the change-over switch to enable the transmitting coil below the vehicle to be in the open mode in the moving process of the vehicle, so that the current directions of all turns of the transmitting coil in the section of the transmitting coil are in the same direction, and a high-frequency magnetic field is generated to perform wireless transmission of energy; the transmitting coil in the outer area of the vehicle is in a standby mode, the current directions of all turns of coils in the transmitting coil are opposite, magnetic fields generated in the space are mutually offset, and further the effect of eliminating leakage magnetic fields is achieved. The system can regulate and control the leakage magnetic field generated by the transmitting coil in real time, effectively eliminates the leakage magnetic radiation generated in the outside area of the vehicle, improves the electromagnetic compatibility and the safety of the system, and reduces the electromagnetic radiation generated by the system to pedestrians and organisms near the wireless power supply road. Meanwhile, the system only needs a single inversion source for power supply, and horizontal shielding belts or shielding aluminum plates do not need to be installed on two sides of the transmitting end, so that the system cost can be effectively reduced, and the construction difficulty is reduced.

Next, a leakage magnetic field regulation method of a dynamic wireless power supply system according to an embodiment of the present invention is described with reference to the drawings.

As shown in fig. 8, the method for regulating and controlling the leakage magnetic field of the dynamic wireless power supply system is based on the leakage magnetic field regulation and control system, and includes the following steps:

in step S1, the vehicle precharge signal is received and initialized, the high-frequency inverter (1) starts supplying power, and the positive direction switch and the negative direction switch of all the changeover switches are closed, so that no current flows through the ground transmission coil.

Specifically, when the vehicle enters a road with a wireless charging function, after a driver sends a pre-charging signal, the ground transmitting terminal device performs an initialization operation, such as starting the power supply of the high-frequency inverter source 1, and simultaneously turning off a positive switch (31) and a negative switch (32) of all the transfer switches, so that no current flows through the ground transmitting coil (2).

In step S2, the ground radar sensor device 2 transmits a detection signal to detect the current position of the vehicle.

In step S3, whether the current position of the vehicle is out of the charging area is judged, if so, the high-frequency inverter (1) is closed, and the charging is finished; and otherwise, marking the area of the vehicle in the ith section of ground transmitting coil (2) according to the current position of the vehicle, wherein i is 1 and 2 … N, and performing step S4.

That is, whether the vehicle runs out of the region where the transmitting end is located is judged, if the vehicle runs out of the charging region, the ground high-frequency inversion source 1 is closed, and charging is finished; and if the vehicle does not exit the charging area, determining the position of the vehicle according to the detection signal, marking the area of the vehicle at the i-th end transmitting coil, wherein i is 1,2 … n, and performing step S4.

In step S4, the No. 1 to No. n switches in the switch matrix (3) are controlled according to the relative position of the vehicle and the ground transmitting coil (2):

specifically, if i is 1,2 negative direction switches (32) in the No. 2 selector switch are turned on, and simultaneously, positive direction switches (31) in the rest selector switches (No. 1 selector switch, No. 3 selector switch.. n selector switch) are turned on; at the moment, the 1 st section of ground transmitting coil enters an opening mode, the transmitting current directions in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated;

if i is more than or equal to 2 and less than or equal to N-1, turning on 2 negative direction switches (32) in the No. 1 change-over switch, the No. i change-over switch and the No. i +1 change-over switch, and simultaneously turning on positive direction switches (31) in the other change-over switches; at the moment, the i-section ground transmitting coil enters an opening mode, the directions of transmitting currents in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated;

if i is equal to N,2 negative direction switches (32) in the No. 1 change-over switch and the No. N change-over switch are turned on, and meanwhile, positive direction switches in the rest change-over switches are turned on; at the moment, the N sections of ground transmitting coils enter an opening mode, the directions of transmitting currents in two adjacent turns of coils are the same, and a main magnetic field is generated to supply power to the vehicle-mounted receiving coil (5); the other sections of the ground transmitting coils enter a standby mode, the directions of transmitting currents in two adjacent turns of coils are opposite, and magnetic leakage radiation cannot be generated.

In step S5, when the i-th ground transmitting coil enters the on mode, the remaining ground transmitting coils enter the standby mode, and are continuously powered on for m seconds, where m is equal to the ratio of the length of the single ground transmitting coil to the average traveling speed of the vehicle; and iterating steps S2 to S5 until the vehicle is driven out of the charging area or a stop charging signal transmitted by the driver is received.

To sum up, the leakage magnetic field regulation and control method of the dynamic wireless power supply system provided by the embodiment of the invention utilizes the ground monitoring radar and the change-over switch to enable the transmitting coil below the vehicle to be in the open mode in the moving process of the vehicle, so that the current directions of all turns of the transmitting coil in the section are the same, and a high-frequency magnetic field is generated to perform wireless energy transmission; the transmitting coil in the outer area of the vehicle is in a standby mode, the current directions of all turns of coils in the transmitting coil are opposite, magnetic fields generated in the space are mutually offset, and further the effect of eliminating leakage magnetic fields is achieved. The method can regulate and control the leakage magnetic field generated by the transmitting coil in real time, effectively eliminate the leakage magnetic radiation generated by the outside area of the vehicle, improve the electromagnetic compatibility and the safety of the system, and reduce the electromagnetic radiation generated by the system to pedestrians and organisms near the wireless power supply road.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.