Wireless charging pile

Abstract

The invention discloses a wireless charging pile, which comprises a shell, and is characterized in that the shell is internally provided with a conversion unit used for converting an externally input alternating current into a direct current; the inversion unit is connected with the conversion unit, and the inversion unit is used for inverting the direct current into high-frequency alternating current; and the wireless transmitting unit is connected with the inversion unit, and the wireless transmitting unit is used for transmitting the high-frequency alternating current to a wireless receiving end of the vehicle through a transmitting coil. According to the wireless charging pile, the power supply unit PSU and the wireless charging transmitting end GA in a traditional wireless charging pile are integrally designed, a high-frequency litz wire between the power supply unit PSU and the wireless charging transmitting end GA is omitted, namely, the conversion unit, the inversion unit and the wireless transmitting unit are integrally designed in the same shell, so that the size of the wireless charging pile can be reduced, and the wireless charging pile is convenient to use. The space utilization rate is improved, the production cost is reduced, and strong electromagnetic radiation cannot be generated.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle power devices, and in particular to a wireless charging pile. Background Art

[0002] The power supply unit PSU (also known as the pile end of the wireless charging pile) and the wireless charging transmitter GA (also known as the ground end of the wireless charging end) of a traditional wireless charging pile are independently designed, and the power connection line between the PSU and GA is generally a high-frequency Litz wire up to five meters long. In this way, the power supply unit PSU transmits high-frequency alternating current to the wireless charging transmitter GA through the high-frequency Litz wire, and then the wireless charging transmitter GA transmits the high-frequency alternating current to the wireless receiving terminal VA under the vehicle to complete the battery charging of the corresponding vehicle.

[0003] However, the use of high-frequency Litz wire will lead to high production costs, and the high-frequency current flowing through it, generally 85Khz, will generate strong electromagnetic radiation, which poses certain safety risks to humans and animals. Therefore, the high-frequency Litz wire needs to be fully shielded, but this is not only difficult to handle, but there is still a risk of shielding rupture during use, followed by electromagnetic leakage, creating safety risks. Summary of the invention

[0004] The present invention provides a wireless charging pile, which is used to solve the problem that the wireless charging pile in the prior art uses high-frequency Litz wire, resulting in high production cost and electromagnetic radiation.

[0005] The technical solution of the present invention is a wireless charging pile, comprising a shell, in which is installed:

[0006] A conversion unit, the conversion unit is used to convert externally input alternating current into direct current;

[0007] An inverter unit, the inverter unit is connected to the conversion unit, and the inverter unit is used to invert the direct current into high-frequency alternating current;

[0008] A wireless transmitting unit, wherein the wireless transmitting unit is connected to the inverter unit, and the wireless transmitting unit is used to transmit the high-frequency alternating current to a wireless receiving end of the vehicle through a transmitting coil.

[0009] Furthermore, the output side of the inverter unit is connected to the input side of the wireless transmitting unit, and the output side of the wireless transmitting unit is used for magnetic coupling with the wireless receiving end of the vehicle.

[0010] Furthermore, the conversion unit includes a first inductor, a second inductor, a third inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube and a bus capacitor;

[0011] The first switch tube and the second switch tube are connected in series to form a first bridge arm, the third switch tube and the fourth switch tube are connected in series to form a second bridge arm, and the fifth switch tube and the sixth switch tube are connected in series to form a third bridge arm;

[0012] Two ends of the first bridge arm, two ends of the second bridge arm and two ends of the third bridge arm are respectively connected to two ends of the bus capacitor and two ends of the input side of the inverter unit; the midpoint of the first bridge arm is connected to the first end of the first inductor, the midpoint of the second bridge arm is connected to the first end of the second inductor, and the midpoint of the third bridge arm is connected to the first end of the third inductor;

[0013] The second end of the first inductor, the second end of the second inductor and the second end of the third inductor are respectively connected to the three phases of the alternating current.

[0014] Furthermore, the inverter unit includes a seventh switch tube, an eighth switch tube, a ninth switch tube and a tenth switch tube;

[0015] The seventh switch tube and the eighth switch tube are connected in series to form a fourth bridge arm, and the ninth switch tube and the tenth switch tube are connected in series to form a fifth bridge arm;

[0016] The two ends of the bus capacitor and the two ends of the output side of the conversion unit are also respectively connected to the two ends of the fourth bridge arm and the two ends of the fifth bridge arm; the midpoint of the fourth bridge arm and the midpoint of the fifth bridge arm are respectively connected to the two ends of the input side of the wireless transmitting unit.

[0017] Furthermore, the wireless transmitting unit also includes a resonant inductor, a feedback capacitor and a resonant capacitor;

[0018] The midpoint of the fourth bridge arm is connected to the first end of the resonant inductor, and the second end of the resonant inductor is connected to the first end of the feedback capacitor and the first end of the resonant capacitor respectively; the midpoint of the fifth bridge arm and the second end of the feedback capacitor are both connected to the opposite-name end of the transmitting coil; the second end of the resonant capacitor is connected to the same-name end of the transmitting coil.

[0019] Furthermore, the wireless charging pile also includes a liquid cooling system, and the liquid cooling system is in contact with the conversion unit, the inverter unit and the wireless transmitting unit through pipelines.

[0020] Furthermore, the liquid cooling system includes a heat exchanger, a coolant storage tank and a water pump;

[0021] The output port of the heat exchanger is connected to the liquid inlet of the coolant storage tank, the liquid outlet of the coolant storage tank is provided with a water pump, and the liquid outlet of the coolant storage tank is connected to the input port of the heat exchanger through the pipeline;

[0022] And the pipeline located between the liquid outlet of the coolant storage tank and the input port of the heat exchanger is in contact with the conversion unit, the inverter unit and the wireless transmitting unit respectively to dissipate heat for the conversion unit, the inverter unit and the wireless transmitting unit.

[0023] Furthermore, the wireless charging pile also includes a communication unit, which is electrically connected to the wireless transmitting unit and the liquid cooling system respectively; the communication unit is used to exchange data between the wireless transmitting unit and the wireless receiving end of the vehicle, exchange the vehicle's entire vehicle information, and exchange data between the user and the wireless charging pile.

[0024] Furthermore, the communication unit includes at least one of a WIFI communication unit, a 4G communication unit and a Bluetooth communication unit.

[0025] Furthermore, the protection grade of the shell is IP67.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] The present invention integrates the power supply unit PSU and the wireless charging transmitter GA in the traditional wireless charging pile, eliminates the high-frequency Litz wire between the power supply unit PSU and the wireless charging transmitter GA, and integrates the conversion unit, the inverter unit and the wireless transmitting unit in the same shell. This not only reduces the volume of the wireless charging pile and improves space utilization, but also reduces production costs and does not generate strong electromagnetic radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1This is a module block diagram of the wireless charging pile of the present invention when charging;

[0031] Figure 2 is a circuit diagram of a conversion unit of the present invention;

[0032] Figure 3 A circuit diagram of the inverter unit and the wireless transmitting unit of the present invention;

[0033] Figure 4 A circuit diagram of magnetic coupling between a wireless transmitting unit and a wireless receiving unit of the present invention;

[0034] Figure 5 Schematic diagram of the liquid cooling system of the present invention.

[0035] Reference numerals:

[0036] 10. Conversion unit;

[0037] 20. Inverter unit;

[0038] 30. Wireless transmitting unit;

[0039] 40. Liquid cooling system;

[0040] 401, heat exchanger; 402, coolant storage tank; 403, water pump; 404, pipeline;

[0041] 50. Communication unit;

[0042] 60. Wireless receiving unit;

[0043] 70. Rectification unit;

[0044] 80. Power battery. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described features. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0046] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0047] The power supply unit PSU and the wireless charging transmitter GA of a traditional wireless charging pile are independently designed, and the power connection line between the power supply unit PSU and the wireless charging transmitter GA is generally a high-frequency Litz wire up to five meters long. In this way, the power supply unit PSU transmits high-frequency alternating current to the wireless charging transmitter GA through the high-frequency Litz wire, and then the wireless charging transmitter GA transmits the high-frequency alternating current to the wireless receiving terminal VA under the corresponding vehicle to complete the battery charging of the corresponding vehicle.

[0048] However, the use of high-frequency Litz wire will lead to high production costs, and the high-frequency current flowing through it, generally 85Khz, will generate strong electromagnetic radiation, which poses certain safety risks to humans and animals. Therefore, the high-frequency Litz wire needs to be fully shielded, but this is not only difficult to handle, but there is still a risk of shielding rupture during use, followed by electromagnetic leakage, creating safety risks.

[0049] Therefore, in order to solve the above problems, in one embodiment, referring to the attached Figure 1 The present invention provides a wireless charging pile, including a housing 100, in which the following components are installed:

[0050] The conversion unit 10 is used to convert externally input alternating current into direct current;

[0051] An inverter unit 20, the inverter unit 20 is connected to the conversion unit 10, and the inverter unit 20 is used to invert the direct current into high-frequency alternating current;

[0052] The wireless transmitting unit 30 is connected to the inverter unit 20 , and is used to transmit high-frequency alternating current through the transmitting coil L to the wireless receiving unit 60 of the vehicle.

[0053] It should be noted that a control unit (not shown, same as in the whole text) is also provided in the wireless charging pile, and the control unit is also connected to a host computer, so that users or staff can view the vehicle information and charging status on the host computer. The housing 100 and the conversion unit 10, the inverter unit 20 and the wireless transmitting unit 30 in the housing 100 are all arranged on the ground.

[0054] The wireless receiving unit 60 of the vehicle is also connected to the rectifying unit 70, and the rectifying unit 70 is further connected to the power battery 80 of the vehicle. Specifically:

[0055] The conversion unit 10 converts the external input AC power into DC power and transmits it to the inverter unit 20. Then the inverter unit 20 converts the received DC power into high-frequency AC power suitable for wireless transmission and transmits it to the wireless transmitting unit 30. Then the high-frequency AC power will generate an alternating magnetic field through the transmitting coil L of the wireless transmitting unit 30. At this time, if the receiving coil R of the wireless receiving unit 60 installed at the bottom of the vehicle enters the range of the alternating magnetic field, the receiving coil R will induce current through the principle of electromagnetic induction, thereby realizing the reception of energy (high-frequency AC power). Then the rectifier unit 70 converts the high-frequency AC power received by the receiving coil R into DC power, which is then used to charge the vehicle's power battery 80.

[0056] Therefore, the present invention integrates the power supply unit PSU and the wireless charging transmitter GA in the traditional wireless charging pile, eliminates the high-frequency Litz wire between the power supply unit PSU and the wireless charging transmitter GA, and integrates the conversion unit 10, the inverter unit 20 and the wireless transmitting unit 30 in the same shell 100. This not only reduces the volume of the wireless charging pile, improves space utilization, and reduces production costs, but also does not generate strong electromagnetic radiation, and there is no need to worry about the risk of shielding rupture after the high-frequency Litz wire is fully shielded.

[0057] Among them, the two ends of the output side of the conversion unit 10 are respectively connected to the two ends of the input side of the inverter unit 20, the two ends of the output side of the inverter unit 20 are respectively connected to the two ends of the input side of the wireless transmitting unit 30, the output side of the wireless transmitting unit 30 is magnetically coupled with the input side of the wireless receiving unit 60 of the vehicle, the two ends of the output side of the wireless receiving unit 60 are respectively connected to the two ends of the input side of the rectifier unit 70, and the two ends of the output side of the rectifier unit 70 are respectively connected to the positive and negative poles of the power battery 80.

[0058] Among them, refer to the attached Figure 2-3 , the present invention proposes a specific circuit in a wireless charging pile:

[0059] The conversion unit 10 includes a first inductor La, a second inductor Lb, a third inductor Lc, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6 and a bus capacitor Cd1; the inverter unit 20 includes a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9 and a tenth switch tube Q10; the wireless transmitting unit 30 also includes a resonant inductor Lf1, a feedback capacitor Cf1 and a resonant capacitor Cs1;

[0060] The first switch tube Q1 and the second switch tube Q2 are connected in series to form a first bridge arm, the third switch tube Q3 and the fourth switch tube Q4 are connected in series to form a second bridge arm, the fifth switch tube Q5 and the sixth switch tube Q6 are connected in series to form a third bridge arm; the seventh switch tube Q7 and the eighth switch tube Q8 are connected in series to form a fourth bridge arm, and the ninth switch tube Q9 and the tenth switch tube Q410 are connected in series to form a fifth bridge arm;

[0061] The two ends of the first bridge arm, the two ends of the second bridge arm and the two ends of the third bridge arm are respectively connected to the two ends of the bus capacitor Cd1; the midpoint of the first bridge arm is connected to the first end of the first inductor La, the midpoint of the second bridge arm is connected to the first end of the second inductor Lb, and the midpoint of the third bridge arm is connected to the first end of the third inductor Lc;

[0062] The second end of the first inductor La is connected to phase A of the alternating current, the second end of the second inductor Lb is connected to phase B of the alternating current, and the second end of the third inductor Lc is connected to phase C of the alternating current.

[0063] The two ends of the bus capacitor Cd1 are also connected to the two ends of the fourth bridge arm and the two ends of the fifth bridge arm respectively; the midpoint of the fourth bridge arm is connected to the first end of the resonant inductor Lf1, and the second end of the resonant inductor Lf1 is connected to the first end of the feedback capacitor Cf1 and the first end of the resonant capacitor Cs1 respectively; the midpoint of the fifth bridge arm and the second end of the feedback capacitor Cf1 are both connected to the opposite-name end of the transmitting coil L; the second end of the resonant capacitor Cs1 is connected to the same-name end of the transmitting coil L.

[0064] See attached Figure 4 In order to ensure that the wireless receiving unit 60 of the vehicle can stably receive the energy of the transmitting coil L, the present invention also proposes a specific circuit structure of the wireless receiving unit 60:

[0065] The wireless receiving unit 60 includes a receiving coil R, a resonant inductor Lf2, a feedback capacitor Cf2 and a resonant capacitor Cs2;

[0066] The transmitting coil L is magnetically coupled with the receiving coil R, the like-name end of the receiving coil R is connected to the first end of the resonant capacitor Cs2, the second end of the resonant capacitor Cs2 is respectively connected to the first end of the feedback capacitor Cf2 and the first end of the resonant inductor Lf2, the second end of the feedback capacitor Cf2 and the opposite-name end of the receiving coil R are both connected to the first wiring terminal, and the first wiring terminal and the second end of the resonant inductor Lf2 are respectively connected to the two ends of the input side of the rectifier unit 70, and the two ends of the output side of the rectifier unit 70 are respectively connected to the positive and negative poles of the power battery 80 of the vehicle.

[0067] It should be noted that the current flowing through the resonant inductor Lf1 of the wireless transmitting unit 30 is in phase with the output voltage UAB of the inverter unit 20, and the current flowing through the resonant inductor Lf2 of the wireless receiving unit 60 is in phase with the input voltage Uab of the rectifier unit 70. Therefore, the output side of the wireless transmitting unit 30 and the output side of the wireless receiving unit 60 both achieve a single power number, and the voltage and current of the wireless receiving unit 60 lag 90° relative to the wireless transmitting unit 30, which means that no matter what the coupling coefficient is, and no matter how the output voltage changes, as long as the condition that the voltage and current of the wireless receiving unit 60 lag 90° relative to the wireless transmitting unit 30 is met, the wireless charging pile in the charging state can remain in the resonant state regardless of how the load changes, thereby ensuring efficient energy transmission.

[0068] Among them, the power supply unit PSU in the traditional charging pile adopts an air-cooling design, so its reliability, safety and service life are obviously insufficient; and the wireless charging transmitter GA in the traditional charging pile adopts a natural cooling design, and heat dissipation faces great challenges, and it is difficult to increase the transmission power.

[0069] Therefore, in order to solve the heat dissipation problem of wireless charging piles, refer to the attached Figure 1 and 5 The wireless charging pile proposed in the present invention adopts a liquid cooling design, specifically:

[0070] The wireless charging pile further includes a liquid cooling system 40, which includes a heat exchanger 401, a coolant storage tank 402 and a water pump 403;

[0071] The output port of the heat exchanger 401 is connected to the liquid inlet of the coolant storage tank 402. The liquid outlet of the coolant storage tank 402 is provided with a water pump 403. The liquid outlet of the coolant storage tank 402 is connected to the input port of the heat exchanger 401 through a pipe 404.

[0072] The pipe 404 located between the liquid outlet of the coolant storage tank 402 and the input port of the heat exchanger 401 is in contact with the heating elements of the conversion unit 10, the inverter unit 20 and the wireless transmitting unit 30 respectively to dissipate heat for the conversion unit 10, the inverter unit 20 and the wireless transmitting unit 30.

[0073] It should be noted that the pipe 404 of the liquid cooling system 40 can extend into the shell 100 and contact the heating elements of the conversion unit 10, the inverter unit 20 and the wireless transmitting unit 30 respectively to dissipate heat; and the liquid cooling system 40 is arranged above the ground or on a column or a wall.

[0074] The heat exchanger 401 can reduce the temperature of the coolant to a specified temperature and then transport it to the coolant storage tank 402. Then the water pump 403 transports the coolant in the coolant storage tank 402 to the pipe 404 in the shell 100 according to the heat dissipation demand. At this time, the coolant flows in the pipe 404 and absorbs the heat of the heating element in contact with the pipe 404 to achieve heat dissipation of the heating element. Then, the coolant after absorbing the heat flows to the heat exchanger 401 for cooling, and the cooled coolant is transported to the coolant storage tank 402 to form a cycle.

[0075] In this way, the liquid cooling system 40 can not only improve the reliability, safety and service life of the wireless charging pile, but also improve the heat dissipation efficiency of the wireless charging pile. While ensuring the heat dissipation efficiency, it also improves the transmission power within the wireless charging pile and speeds up the charging speed and efficiency of the power battery 80.

[0076] Among them, the wireless charging pile proposed in the present invention also includes an auxiliary detection unit 90, and the auxiliary detection unit 90 is connected between the inverter unit 20 and the wireless transmitting unit 30, and the auxiliary detection unit 90 is used to detect whether there are foreign objects and / or living things on the surface of the wireless transmitting unit 30. If there are any foreign objects and / or living things, staff are required to deal with them to prevent affecting the charging efficiency of the power battery 80; and the auxiliary detection unit 90 can also locate the position of the vehicle to ensure that the wireless transmitting unit 30 can be aligned with the wireless receiving unit 60, so as to ensure that the wireless receiving unit 60 can stably receive the energy of the transmitting coil L, thereby improving the charging efficiency of the power battery 80.

[0077] It should be noted that the auxiliary detection unit 90 proposed in the present invention is a prior art and will not be described in detail here.

[0078] Among them, refer to the attached Figure 1 The wireless charging pile also includes a communication unit 50, which is electrically connected to the wireless transmitting unit 30 and the liquid cooling system 40 respectively; the communication unit 50 is used to exchange data between the wireless transmitting unit 30 and the wireless receiving unit 60 of the vehicle, that is, the communication unit 50 is responsible for coordinating the communication between the wireless transmitting unit 30 and the wireless receiving unit 60, such as the power transmission status, energy transmission efficiency and other information; the communication unit 50 can also exchange vehicle information such as battery status, vehicle location, etc., and send this information to the wireless transmitting unit 30 or the host computer; the communication unit 50 can also exchange data between the user and the wireless charging pile, that is, the user can use a device such as a smart phone to authenticate the identity in order to start the charging process, and the user can also query the charging status of the vehicle, the remaining charging time and other information through a device such as a smart phone.

[0079] It should be noted that the communication unit 50 is generally arranged above the ground, that is, the communication unit 50 is installed on a column or a wall to ensure a good signal coverage range.

[0080] And the communication unit 50 is connected to the wireless transmitting unit 30 via a signal line, which helps to ensure stable data transmission.

[0081] The communication unit 50 can also send the operating status, fault information, etc. of the wireless charging pile to the host computer (remote monitoring center) to facilitate timely maintenance and management; the staff can also remotely adjust the charging parameters, such as maximum charging power, charging schedule, etc. from the host computer through the communication unit 50.

[0082] The control unit can control the switch of the water pump 403 through the communication unit 50 to control the opening and closing angle of the water pump 403 according to the temperature of the wireless transmitting unit 30, thereby controlling the flow of the coolant to the housing 100. The control unit is also electrically connected to the heat exchanger 401 so that the control unit starts the heat exchanger 401.

[0083] The communication unit 50 includes at least one of a WIFI communication unit, a 4G communication unit and a Bluetooth communication unit. This embodiment takes the WIFI communication unit as an example.

[0084] Among them, the protection level of the shell 100 is IP67, which can further improve the reliability, safety and service life of the wireless charging pile.

[0085] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A wireless charging station, characterized in that: The invention comprises a housing, in which is installed: A conversion unit, the conversion unit is used to convert externally input alternating current into direct current; An inverter unit, the inverter unit is connected to the conversion unit, and the inverter unit is used to invert the direct current into high-frequency alternating current; A wireless transmitting unit, wherein the wireless transmitting unit is connected to the inverter unit, and the wireless transmitting unit is used to transmit the high-frequency alternating current to a wireless receiving end of the vehicle through a transmitting coil.

2. The wireless charging station according to claim 1, characterized in that: The output side of the inverter unit is connected to the input side of the wireless transmitting unit, and the output side of the wireless transmitting unit is used for magnetic coupling with the wireless receiving end of the vehicle.

3. The wireless charging station according to claim 1, characterized in that: The conversion unit includes a first inductor, a second inductor, a third inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube and a bus capacitor; The first switch tube and the second switch tube are connected in series to form a first bridge arm, the third switch tube and the fourth switch tube are connected in series to form a second bridge arm, and the fifth switch tube and the sixth switch tube are connected in series to form a third bridge arm; Two ends of the first bridge arm, two ends of the second bridge arm and two ends of the third bridge arm are respectively connected to two ends of the bus capacitor and two ends of the input side of the inverter unit; the midpoint of the first bridge arm is connected to the first end of the first inductor, the midpoint of the second bridge arm is connected to the first end of the second inductor, and the midpoint of the third bridge arm is connected to the first end of the third inductor; The second end of the first inductor, the second end of the second inductor and the second end of the third inductor are respectively connected to the three phases of the alternating current.

4. The wireless charging station according to claim 1, characterized in that: The inverter unit includes a seventh switch tube, an eighth switch tube, a ninth switch tube and a tenth switch tube; The seventh switch tube and the eighth switch tube are connected in series to form a fourth bridge arm, and the ninth switch tube and the tenth switch tube are connected in series to form a fifth bridge arm; The two ends of the bus capacitor and the two ends of the output side of the conversion unit are also respectively connected to the two ends of the fourth bridge arm and the two ends of the fifth bridge arm; the midpoint of the fourth bridge arm and the midpoint of the fifth bridge arm are respectively connected to the two ends of the input side of the wireless transmitting unit.

5. The wireless charging station according to claim 4, characterized in that: The wireless transmitting unit also includes a resonant inductor, a feedback capacitor and a resonant capacitor; The midpoint of the fourth bridge arm is connected to the first end of the resonant inductor, the second end of the resonant inductor is respectively connected to the first end of the feedback capacitor and the first end of the resonant capacitor, the second end of the resonant capacitor is connected to the same-name end of the transmitting coil; the midpoint of the fifth bridge arm and the second end of the feedback capacitor are both connected to the opposite-name end of the transmitting coil.

6. The wireless charging station according to claim 1, characterized in that: The wireless charging pile also includes a liquid cooling system, which is in contact with the conversion unit, the inverter unit and the wireless transmitting unit through pipelines.

7. The wireless charging station according to claim 6, characterized in that: The liquid cooling system includes a heat exchanger, a coolant storage tank and a water pump; The output port of the heat exchanger is connected to the liquid inlet of the coolant storage tank, the liquid outlet of the coolant storage tank is provided with a water pump, and the liquid outlet of the coolant storage tank is connected to the input port of the heat exchanger through the pipeline; And the pipeline located between the liquid outlet of the coolant storage tank and the input port of the heat exchanger is in contact with the conversion unit, the inverter unit and the wireless transmitting unit respectively to dissipate heat for the conversion unit, the inverter unit and the wireless transmitting unit.

8. The wireless charging station according to claim 6, characterized in that: The wireless charging pile also includes a communication unit, which is electrically connected to the wireless transmitting unit and the liquid cooling system respectively; the communication unit is used to exchange data between the wireless transmitting unit and the wireless receiving end of the vehicle, exchange the vehicle's entire vehicle information, and exchange data between the user and the wireless charging pile.

9. The wireless charging station according to claim 8, characterized in that: The communication unit includes at least one of a WIFI communication unit, a 4G communication unit and a Bluetooth communication unit.

10. The wireless charging station according to claim 1, characterized in that: The protection grade of the housing is IP67.

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