Drone Wireless Charging System

Abstract

The present invention discloses a wireless charging system for an unmanned aerial vehicle (UAV), which includes a UAV and a charging platform. A receiving module for wireless charging is installed on the UAV, and the charging platform has a bearing surface for carrying the UAV, and a transmitting module for wireless charging is installed on the bearing surface. The receiving module includes: a receiving end electrode plate, a receiving end control circuit, a receiving end communicator, and a battery pack; the transmitting module includes: a transmitting end electrode plate, a transmitting end control circuit, and a transmitting end communicator; during the wireless charging process, the receiving end electrode plate and the transmitting end electrode plate are within the working range of forming a capacitor. The receiving end electrode plate is easy to manufacture and has a light weight. When the UAV is parked on the charging platform, the gap between the electrode plates is very small, and the electromagnetic interference to the surrounding environment is very small. When there is a metal conductor between or around the receiving end electrode plate and the transmitting end electrode plate, there will be no loss and heating caused by the eddy current effect of the conductor, which is very suitable for the charging application of UAVs.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging, and particularly to a wireless charging system for drones. Background Art

[0002] Currently, wireless energy transmission is commonly divided into two methods - the method based on magnetic field coupling and the method based on electric field coupling. Among them, the magnetic field coupling method has been widely applied and concerned in the fields of consumer electronics, AGV robots (Automated Guided Vehicle), and electric vehicles. The coupling mechanism adopted by magnetic field coupling generally consists of multiple layers such as Litz coils, ferrite, and shielding layers, which have problems such as high cost and heavy weight. During the wireless transmission process of the magnetic field coupling method, some magnetic field leakage and electromagnetic interference will also be generated. When there are metal foreign objects in the transmission space that cannot be identified, the temperature of the foreign objects will rise due to the eddy current effect, and it may even ignite flammable substances and cause a fire. There are still some potential safety hazards that need to be overcome in unattended scenarios such as drone charging. Summary of the Invention

[0003] The present invention provides a wireless charging system for drones, which has the advantages of low cost and low weight, and can simultaneously reduce the potential safety hazards brought by metal foreign objects.

[0004] The wireless charging system for drones of the present invention includes a drone and a charging platform. A receiving module for wireless charging is installed on the drone. The charging platform has a bearing surface for bearing the drone, and a transmitting module for wireless charging is installed on the bearing surface. The receiving module includes: a receiving end electrode plate, a receiving end control circuit, a receiving end communicator, and a battery pack. The transmitting module includes: a transmitting end electrode plate, a transmitting end control circuit, and a transmitting end communicator. During wireless charging, the receiving end electrode plate and the transmitting end electrode plate are within the working range, and the working range refers to the range in which the receiving end electrode plate and the transmitting end electrode plate can form a capacitor.

[0005] Preferably, the bearing surface covers the transmitting end electrode plate, and at least the bearing surface in the area where the transmitting end electrode plate is located is an insulating dielectric layer.

[0006] Preferably, the receiving end electrode plate is arranged at the bottom of the landing gear of the drone, facing the direction of the charging platform; an insulating dielectric layer is covered outside the receiving end electrode plate.

[0007] Preferably, both the receiving end electrode plate and the transmitting end electrode plate are cylindrical, one is sleeved in the other, and there is a gap between the outer wall of the inner cylindrical shape and the inner wall of the outer cylindrical shape.

[0008] Preferably, both the receiving end electrode plate and the transmitting end electrode plate are composed of an array of multiple electrode plates.

[0009] Preferably, the receiving end plate is divided into two parts, namely a first central part and a first outer ring part arranged around the first central part; the transmitting end plate is divided into two parts, namely a second central part and a second outer ring part arranged around the second central part; during wireless charging, the first central part and the second central part are within the working range of forming a capacitor; the first outer ring part and the second outer ring part are within the working range of forming a capacitor.

[0010] The receiving end control circuit includes: a receiving end compensation circuit, a receiving end rectifying circuit, a receiving end filtering circuit, and a receiving end controller.

[0011] Preferably, the transmitting end control circuit includes: a transmitting end compensation circuit, a transmitting end inverting circuit, and a transmitting end controller; the transmitting end control circuit is connected to a power supply.

[0012] Preferably, the transmitting end control circuit further includes: a transmitting end rectifying circuit and a transmitting end filtering circuit.

[0013] Preferably, there are multiple groups of transmitting end plates, and at least one group of the transmitting end plates is selectively operated through a control switch.

[0014] When the unmanned aerial vehicle (UAV) wireless charging system of the present invention works, the receiving end plate is easy to manufacture, light in weight, and its shape is not restricted, which will not impose more additional load burdens on the UAV. Its overall cost is also at a very small level compared with magnetic coupling coils. When the UAV is parked on the charging platform, the gap between the plates is very small. During wireless charging, most of the alternating electric field is distributed between the plates, and the electromagnetic interference to the surrounding environment is very small. Especially when there are metal conductors between or around the receiving end plate and the transmitting end plate, there will be no loss and heating caused by the eddy current effect of the conductor, which is very suitable for the charging application of UAVs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the UAV wireless charging system of the present invention.

[0016] Figure 2 It is a schematic diagram of the receiving module and the transmitting module in the UAV wireless charging system of the present invention.

[0017] Figure 3 It is a schematic diagram of an embodiment of the receiving end plate and the transmitting end plate in the UAV wireless charging system of the present invention.

[0018] Figure 4 It is a schematic diagram of another embodiment of the receiving end plate and the transmitting end plate in the UAV wireless charging system of the present invention.

[0019] Figure 5 Schematic diagram of the control switch in the wireless charging system of the drone of the present invention.

[0020] Figure 6 Partial circuit structure on the drone side in the wireless charging system of the drone of the present invention. Detailed implementation manners

[0021] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0022] The wireless charging system of the drone of the present invention includes two parts: the drone 4 and the charging platform 3. On the one hand, the charging platform 3 can provide wireless charging for the drone and can also serve as a parking platform for the drone 4. The following mainly describes the wireless charging.

[0023] It should be noted that since it is a wireless charging system, obviously both the drone 4 and the charging platform 3 need to support the wireless charging function. Refer to Figure 1 , a receiving module 1 for wireless charging is installed on the drone 4. Correspondingly, a transmitting module 2 for wireless charging should be provided on the bearing platform. Specifically, since the charging platform 3 also has the function of carrying the drone 4, the charging platform 3 has a bearing surface 31 for supporting the drone 4. Installing the transmitting module 2 for wireless charging on the bearing surface 31 is more conducive to the operation of wireless charging.

[0024] Combined with, Figure 1 and Figure 2 , the receiving module 1 includes a receiving end electrode plate 11, a receiving end control circuit 12, a receiving end communicator 13, and a battery pack 14. The transmitting module 2 includes a transmitting end electrode plate 21, a transmitting end control circuit 22, and a transmitting end communicator 23.

[0025] In some preferred embodiments, the receiving end control circuit 12 includes: a receiving end compensation circuit, a receiving end rectifying circuit, a receiving end filtering circuit, and a receiving end controller. The transmitting end control circuit 22 includes: a transmitting end compensation circuit, a transmitting end inverter circuit, and a transmitting end controller; the transmitting end control circuit 22 is connected to the power supply. It should be noted that the receiving end compensation circuit and the transmitting end compensation circuit can be provided simultaneously or only one of them can be provided. Generally speaking, dual-end compensation is more common (dual-end compensation means setting both the receiving end compensation circuit and the transmitting end compensation circuit simultaneously) because better transmission characteristics can be obtained. However, setting only the receiving end compensation circuit or only the transmitting end compensation circuit can also be used in this application. That is to say, at least one side of the transmitting module 2 and the receiving module 1 includes a compensation circuit. For the convenience of description below, the receiving end compensation circuit and the transmitting end compensation circuit are collectively referred to as the compensation circuit.

[0026] The receiving end electrode plate 11 and the transmitting end electrode plate 21 constitute two basic components during wireless charging. When charging is required, they need to be within a suitable working range. In this working range, the receiving end electrode plate 11 and the transmitting end electrode plate 21 can form a capacitor, and with the characteristics of the capacitor, wireless power transfer can be achieved. The specific values of this working range need to be set differently according to the materials, sizes, and other characteristics of the receiving end electrode plate 11 and the transmitting end electrode plate 21. Generally, when the drone 4 is parked on the charging platform 3, it can meet the working distance.

[0027] Generally, the bearing surface 31 of the charging platform 3 covers the transmitting end electrode plate 21, that is, generally the transmitting end electrode plate 21 is not directly exposed, and at least the bearing surface 31 in the area where the transmitting end electrode plate 21 is located is an insulating dielectric layer. That is, at least a dielectric layer is covered on the transmitting end electrode plate 21, which can be the bearing platform itself or an additional dielectric layer.

[0028] The receiving end electrode plate 11 is arranged on the drone 4 and is arranged in the direction towards the charging platform 3. The original intention of its arrangement is to be able to form a capacitor with the transmitting end electrode plate 21 within the working range to ensure the progress of wireless charging. Preferably, the receiving end electrode plate 11 is arranged at the bottom of the landing gear 41 in the direction towards the charging platform 3. Of course, the receiving end electrode plate 11 can also be directly arranged at the bottom of the drone 4 body as long as it does not affect the formation of a capacitor with the transmitting end electrode plate 21. At the same time, an insulating dielectric layer is covered outside the receiving end electrode plate 11.

[0029] The dielectric layer between the receiving end plate 11 and the transmitting end plate 21 can effectively increase the coupling capacitance value, maintain good insulation between the receiving end plate 11 and the transmitting end plate 21, and improve the ability of the system to transfer electric energy. As an embodiment, the dielectric layer can be directly bonded or coated on the facing surfaces of the receiving end plate 11 and the transmitting end plate 21. The dielectric layer can be one or a combination of glass, ceramic laminate, barium titanate, lead zirconate titanate, and titanium dioxide.

[0030] The above-mentioned arrangement of setting the receiving end plate 11 at the bottom of the UAV 4 body or the landing gear 41, and setting the transmitting end plate 21 on the bearing surface 31 of the charging platform 3 is a preferred solution. Other setting positions that can enable the receiving end plate 11 and the transmitting end plate 21 to form a capacitor can also be applied to this application. For example, a circular receiving end plate 11 is arranged around the UAV 4, and a corresponding circular transmitting end plate 21 is also arranged around the bearing surface 31. Even, the charging platform 3 is made into a "box-shaped" structure, that is, it has multiple outer walls, and the multiple outer walls form an internal accommodation space for accommodating the UAV 4. The bearing surface 31 serves as the bottom surface of the accommodation space. At this time, multiple outer walls can all be used as the transmitting end plate 21, and the receiving end plate 11 on the UAV 4 can be set at any position, and there can be a corresponding transmitting end plate 21 to cooperate with it.

[0031] Next, several optional setting forms of the receiving end plate 11 and the transmitting end plate 21 will be described. For example, both the receiving end plate 11 and the transmitting end plate 21 are in a cylindrical shape. As Figure 3 shown, one is sleeved in the other, and there is a gap between the outer wall of the inner cylindrical shape and the inner wall of the outer cylindrical shape. This method can be applied to the form of "arranging a circular receiving end plate 11 around the UAV 4 and arranging a corresponding circular transmitting end plate 21 around the bearing surface 31", or the receiving end plate 11 is arranged at the bottom of the UAV 4 body or the landing gear 41, and the transmitting end plate 21 is arranged on the bearing surface 31. When the UAV 4 is parked on the bearing surface 31, the receiving end plate 11 and the transmitting end plate 21 are matched in a "nested" manner, and the receiving end plate 11 extends into the transmitting end plate 21.

[0032] Or, as Figure 4 shown, both the receiving end plate 11 and the transmitting end plate 21 are composed of multiple plate arrays. The coverage area of the transmitting end plate 21 can be the entire range of the bearing surface 31. When the UAV 4 is parked, the accuracy requirement for the placement position will be reduced, and as long as it is parked, it can meet the requirements of the working range. Figure 3 The shown receiving end plate 11 and the transmitting end plate 21 are in a "honeycomb" shape, and the number of receiving end plates 11 can be less than the number of transmitting end plates 21.

[0033] Another optional setting method is that the receiving end plate 11 is divided into two parts, namely a first central part and a first outer ring part arranged around the first central part; the transmitting end plate 21 is divided into two parts, namely a second central part and a second outer ring part arranged around the second central part; during wireless charging, the first central part and the second central part are within the working range of forming a capacitor; the first outer ring part and the second outer ring part are within the working range of forming a capacitor.

[0034] The above descriptions of the receiving end plate 11 and the transmitting end plate 21 are only preferred embodiments and are not used to limit this application. Other forms can also be used in this application. For example, the most basic structure is that both the receiving end plate 11 and the transmitting end plate 21 are plate-shaped electrodes, and a capacitor can be formed when they are within the working range.

[0035] As an example, the transmitting end plate 21 and the receiving end plate 11 can be made of metal materials such as thin and light copper foil and aluminum foil, or thin film electrodes can be made of carbon materials, metal oxides and hydrates, conductive polymers, etc. The forms of the transmitting end plate 21 and the receiving end plate 11 can be one or a combination of forms such as ring type, flat type, cylindrical type, spherical type, laminated type, and array type. When the electrode plates are in an array form, that is, both the above-mentioned receiving end plate 1 and the transmitting end plate 21 are composed of multiple electrode plates arranged in an array. At this time, multiple electrode plates of the transmitting end plate 21 and multiple electrode plates of the receiving end plate 11 are coupled to form multiple capacitors, and these capacitors are equivalent to a group of coupling capacitors according to the series-parallel relationship.

[0036] In some embodiments, the transmitting end plate 21 can be in multiple groups, such as Figure 5 shown. These transmitting end plates 21 are connected to the control switch 5. When the receiving end plate 11 of the unmanned aerial vehicle is aligned with one or more groups of the transmitting end plates 21, the transmitting controller turns on the control switch 5 connected to the corresponding transmitting end plate 21 to form a coupled capacitor with the receiving end plate 11. This method can be switched according to the transmitting end plate 21 aligned by the unmanned aerial vehicle, which is convenient for the unmanned aerial vehicle to align. For example, as Figure 5 shown, the receiving end plate 11 corresponds to the two middle transmitting end plates 21 in position to form a capacitor. At this time, the two middle control switches 5 are closed, so that the corresponding two transmitting end plates 21 can work, that is, they can form a capacitor with the receiving end plate 11 to complete the need for wireless charging.

[0037] It should be noted that when the transmitting end plate 21 and the receiving end plate 11 form a capacitor and achieve wireless charging, generally two plates are required to work respectively to form a closed circuit. In this application, when the quantity is not specifically stated, it can be understood that the above-mentioned transmitting end plate 21 can be formed by two plates. Correspondingly, the receiving end plate 11 is also formed by two plates. The drone 4 in the wireless charging system of the drone 4, in addition to the above-mentioned receiving module 1, also includes a fuselage structure, a power system, a navigation system, a flight control system, a mission payload, and a gimbal, etc. The power system includes a motor 42, a drive circuit 43 for driving the motor 42 to work, and so on.

[0038] The receiving module 1 is connected to the charging input port of the battery pack 14. The charging controller in the receiving end control circuit 12 can be set independently, or can be a part of the flight control system or other controllers of the drone 4. The receiving end communicator 13 can also be an independent part, which can not only be used for communication during the wireless charging process, but also be used for the overall communication of the drone 4, such as communication with the operator.

[0039] During the flight of the drone 4, when the power of the battery pack 14 during flight drops below the safety threshold, the drone 4 returns to the base under the guidance of the GPS, sensors or vision system in the navigation system, and automatically lands on the ground charging platform 3 to start replenishing power through wireless charging. On the one hand, the battery pack 14 stores electrical energy through wireless charging, and on the other hand, it also supplies power to other parts such as the power system. The above-mentioned receiving module 1 including the battery pack 14 does not limit that the battery pack 14 can only work for the receiving module 1.

[0040] The power supply can be AC power supply or DC power supply. When using AC power supply, the transmitting module 2 also needs to add circuits with rectifying function and filtering function - the transmitting end rectifying circuit and the transmitting end filtering circuit.

[0041] The receiving end plate 11 and the transmitting end plate 21 are generally divided into two groups. During wireless charging, the two groups of transmitting end plates 21 and the two groups of receiving end plates 11 are aligned respectively, and two capacitors are coupled and formed. When the transmitting end plate 21 is directly installed on the bearing surface 31 of the charging platform 3, the receiving end plate 11 can be installed at the bottom of the drone or separately installed under the landing gear 41 of the drone 4. When the drone 4 is parked on the charging platform 3, the receiving end plate 11 can be aligned with the transmitting end plate 21 under the control of the flight control system of the drone 4. The receiving end plate 11 can also be installed at other positions of the drone 4, and when charging is required, it is flipped to the bottom through a rotating mechanism to be aligned with the transmitting end plate 21.

[0042] The receiving end plate 11 can also be installed on the side, top, etc. of the drone 4. Correspondingly, the transmitting end plate 21 is installed on the other side perpendicular or parallel to the platform. The above installation method is only for illustration, and there is no strict requirement for the installation position of the receiving end plate 11. As long as the two sets of transmitting end plates 21 and receiving end plates 11 can be aligned respectively during charging and the distance between the plates meets the charging requirements.

[0043] When the power supply for the wireless charging of the drone 4 is alternating current, the alternating current output by the power supply is converted into direct current through the transmitting end rectifying circuit and the transmitting end filtering circuit. When the power supply is direct current, the output direct current, or when the power supply is alternating current, the direct current converted from the alternating current, is sent to the transmitting end inverter circuit to be converted into high-frequency alternating current, and then is applied to the transmitting end plate 21 through the transmitting end compensation circuit.

[0044] A coupled capacitor is formed between the transmitting end plate 21 and the receiving end plate 11 through the alignment of the transmitting end plate 21 and the receiving end plate 11. The two coupled capacitors formed by the two sets of transmitting end plates 21 and the two sets of receiving end plates 11 connect the transmitting circuit and the receiving circuit to form a loop. Under the action of high-frequency high-voltage alternating current, the high-frequency alternating current is transmitted to the receiving end rectifying circuit of the receiving module through the coupled capacitor. The high-frequency alternating current is converted into direct current through the receiving end rectifying circuit, and after the stray waveforms are filtered by the receiving end filtering circuit, it is input into the battery pack 14 of the drone 4 from the charging port, thus wirelessly charging the drone.

[0045] Each of these two compensation circuits includes at least one compensation inductor. The compensation inductor and the coupled capacitor formed by the plates constitute a resonant network in one of the series or parallel forms. It is also possible to form a composite compensation circuit through a combination of multiple inductors and / or capacitors, and then form a resonant network with the coupled capacitor (the capacitor formed by the transmitting end plate 21 and the receiving end plate 11).

[0046] By setting the compensation circuit, the compensation inductor and the coupled capacitor constitute a resonant network, which can work in the resonant state to increase the voltage on the coupled capacitor and generate a large displacement current between the coupled capacitors, thereby realizing the transfer of energy. The compensation circuit can also compensate for the reactive power in the power circuit and improve the working efficiency of the system charging.

[0047] However, since the capacitance formed by the transmitting end plate 21 and the receiving end plate 11 generally has a relatively small capacitance value, in order to obtain higher transmission power and transmission efficiency, when configuring the compensation circuit, it is usually necessary to use a larger compensation inductor or operate at a higher operating frequency. When the operating frequency is too high, the loss of the power switch tube and the electromagnetic interference of the system will inevitably increase, which also increases the control difficulty of the system; while increasing the compensation inductor will increase the volume and weight of the system. When the compensation circuit is set in the receiving module (i.e., the receiving end compensation circuit), or when it is set on both sides simultaneously, similar to the coil of magnetic coupling wireless charging, it will also additionally increase the load of the drone 4, which limits the application of the wireless charging system in the drone. To solve this problem, the motor 42 in the drone power system can be integrated into the compensation circuit as a compensation inductor, which improves the device utilization rate and reduces the system cost.

[0048] As Figure 6 Shown is a partial circuit structure on one side of the drone 4. Taking the outer rotor DC brushless motor selected for the drone as an example, the coil windings of the motor 42 are connected in a triangular connection. The coil windings of one motor of the drone are connected to 2 switching switches, which are shown as K1 and K2 in the figure respectively. During the flight of the drone, the first switching switch K1 is turned on and the second switching switch K2 is turned off. The battery pack 14 provides power for the rotation of the motor. The flight control system adjusts the speed of the motor 42, switches the rotation direction and starts and stops, etc. through the drive circuit 43 to control the drone to complete the flight mission. During the charging process of the drone, the first switching switch K1 is turned off and the second switching switch K2 is turned on. The capacitance formed between the transmitting end plate 21 and the receiving end plate 11 is connected to the coil windings of the motor. The series and parallel connection between the coil windings of the motor 42 is equivalent to an inductor. The equivalent inductor of the motor and the capacitance formed between the transmitting end plate 21 and the receiving end plate 11 are connected in series to form a series resonance network, and the transmitting module 2 outputs high-frequency alternating current.

[0049] In addition, the multiple motors of the multi-rotor drone can obtain a more suitable inductance value for forming a resonance network through series and parallel combinations. The capacitance formed between the transmitting end plate 21 and the receiving end plate 11 and the equivalent inductor of the motor can be in parallel resonance in addition to series resonance, or can be connected in series and parallel with several inductors and capacitors to form a composite resonance circuit.

[0050] During the entire charging process, the charging controller of the drone continuously sends charging requirements, including signals such as current and voltage, to the transmitting end controller of the charging platform 3 through wireless communication, and will collect the charging current and voltage and monitor the battery power. The charging platform 3 adjusts the output of the power supply according to the charging requirements and controls parameters such as the frequency and phase of the high-frequency alternating current to make the coupled capacitance and the compensation circuit in a resonance state. When the drone finishes charging, the receiving end controller sends a stop charging command to the transmitting end controller of the charging platform 3 to terminate the charging process.

[0051] The wireless communication between the charging platform 3 and the drone data can be carried out through their respective built-in communication modules. In addition, as an example, the signals to be communicated can be loaded onto the high-frequency alternating current waves for wireless transmission in the form of a modulated carrier, and a demodulation circuit can be added to the receiving circuit to demodulate the transmitted data signal from the high-frequency alternating current to achieve the parallel transmission of energy and signals.

[0052] In the present invention, when wireless charging is achieved through electric field coupling, the receiving end plate 11 of the receiving module 1 is very simple and thin in production, its shape is not restricted, and it will not impose more additional load burdens on the drone. Its overall cost is also at a very small level compared with the magnetic coupling coil. When the drone is parked on the charging platform 3, the gap between the plates is very small. During wireless charging, most of the alternating electric field is distributed between the plates, resulting in very little electromagnetic interference to the surrounding environment. Especially when there are metal conductors between or around the electric field plates, there will be no loss and heating caused by the eddy current effect generated by the conductor, which is very suitable for the charging application of drones.

[0053] The structure, features and function effects of the present invention have been described in detail based on the embodiments shown in the drawings. The above is only the preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or equivalent embodiments modified into equivalent changes, still within the spirit covered by the description and the drawings, should be within the protection scope of the present invention.

Claims

1. A wireless charging system for a drone, comprising a drone (4) and a charging platform (3), characterized in that, a receiving module (1) for wireless charging is installed on the drone (4), the charging platform (3) has a bearing surface (31) for carrying the drone (4), and a transmitting module (2) for wireless charging is installed on the bearing surface (31); The receiving module (1) includes: a receiving end plate (11), a receiving end control circuit (12), a receiving end communicator (13) and a battery pack (14); The transmitting module (2) includes: a transmitting end plate (21), a transmitting end control circuit (22) and a transmitting end communicator (23); During wireless charging, the receiving end plate (11) and the transmitting end plate (21) are within the working range, and the working range refers to the range in which the receiving end plate (11) and the transmitting end plate (21) can form a capacitor; The drone (4) has a motor (42), and the motor (42) has a coil winding, and the coil winding is connected to a first switching switch (K1) and a second switching switch (K2); During the flight of the drone, the first switching switch (K1) is turned on and the second switching switch (K2) is turned off, and the battery pack (14) provides power for the rotation of the motor; During the charging of the drone, the first switching switch (K1) is turned off and the second switching switch (K2) is turned on, and the capacitor formed between the transmitting end plate (21) and the receiving end plate (11) is connected to the motor coil winding. The series and parallel connection between the motor (42) coil windings is equivalent to an inductor, and the equivalent inductor of the motor and the capacitor formed between the transmitting end plate (21) and the receiving end plate (11) are connected in series to form a series resonance network.

2. The wireless charging system for a drone according to claim 1, characterized in that, The bearing surface (31) covers the transmitting end plate (21), and at least the bearing surface (31) in the area where the transmitting end plate (21) is located is an insulating dielectric layer.

3. The wireless charging system for a drone according to claim 1, characterized in that, The receiving end plate (11) is arranged at the bottom of the landing gear (41) of the drone (4) and is arranged in the direction towards the charging platform (3); The receiving end plate (11) is covered with an insulating dielectric layer.

4. The wireless charging system for a drone according to claim 1, characterized in that, Both the receiving end plate (11) and the transmitting end plate (21) are cylindrical, one is sleeved in the other, and there is a gap between the outer wall of the inner cylindrical shape and the inner wall of the outer cylindrical shape.

5. The wireless charging system for a drone according to claim 1, characterized in that, Both the above-mentioned receiving end plate (11) and the transmitting end plate (21) are composed of a plurality of plate arrays.

6. The wireless charging system for a drone according to claim 1, characterized in that, The receiving end plate (11) is divided into two parts, namely a first central part and a first outer ring part arranged around the first central part; The transmitting end electrode plate (21) is divided into two parts, namely a second central part and a second outer ring part arranged around the second central part; During wireless charging, the first central part and the second central part are within the working range of forming a capacitor; the first outer ring part and the second outer ring part are within the working range of forming a capacitor.

7. The drone wireless charging system according to claim 1, wherein The receiving end control circuit (12) includes: a receiving end compensation circuit (121), a receiving end rectifying circuit (122), a receiving end filtering circuit (123), and a receiving end controller (124).

8. The drone wireless charging system according to claim 1, wherein The transmitting end control circuit (22) includes: a transmitting end compensation circuit (221), a transmitting end inverter circuit (222), and a transmitting end controller (223); The transmitting end control circuit (22) is connected to a power supply.

9. The drone wireless charging system according to claim 8, wherein The transmitting end control circuit (22) further includes: a transmitting end rectifying circuit (224) and a transmitting end filtering circuit (225).

10. The drone wireless charging system according to claim 1, wherein There are multiple groups of transmitting end electrode plates (21), and at least one group of the transmitting end electrode plates (21) is selectively operated through a control switch (5).

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