Inductance compensation circuit for the non-resonant end of the wireless charging system and extension line of the non-resonant coil

Abstract

This invention provides a non-resonant inductance compensation circuit and a non-resonant coil extension line for a wireless charging system. The non-resonant coil extension line consists of two Litz wires wound into a flat, closely spaced conductor as the internal wire, covered with a grounded copper mesh and an insulating layer to effectively increase current and reduce radiation. The non-resonant inductance compensation circuit includes the non-resonant coil extension line, with its two ends connected to the transmitting non-resonant coil and the transmitting control circuit, respectively. This inductance compensation circuit compensates for the inductance of the transmitting non-resonant coil to meet the requirements of magnetic wireless charging, effectively solving the charging instability problem caused by changes in inductance when the extension of the transmitting non-resonant coil changes.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology, and more specifically to a non-resonant end inductance compensation circuit and a non-resonant coil extension line for a wireless charging system. Background Technology

[0002] Magnetic wireless charging utilizes the principle of magnetism to achieve an adsorption effect. The magnetic structure makes it easy to remove the adsorption interface during use, and has high alignment accuracy. Simply bring the two ends close together to achieve wireless charging, making it one of the preferred wireless charging methods.

[0003] It is worth noting that with the development of electric bicycles and wireless charging technology, in the magnetic wireless charging scenario for electric bicycles, due to the uncertainty of the bicycle's parking location, the transmitter, i.e., the non-resonant end, is usually designed as a retractable independent coil structure, separate from the transmitter circuit (placed in the charging box), to facilitate wireless charging operation. This minimizes the weight of the coil for the user and improves the feasibility of the solution. When not charging, the transmitter's coil extension is usually coiled to save space; when charging, the transmitter is pulled out and magnetically attracted to the receiver structure.

[0004] However, during the process of winding and stretching the coil for charging, the coil inductance will increase or decrease due to factors such as the length of the coil wire and the number of turns. The change in inductance will have a significant adverse impact on the efficiency of wireless charging for electric bicycles.

[0005] Furthermore, most existing transmitter coil extension lines use coaxial cables. Traditional coaxial cables are expensive and have limited power.

[0006] Furthermore, traditional dual-resonance wireless power transfer systems suffer from high voltage due to transmitter resonance and are highly sensitive to inductance, resulting in poor system stability over extended periods.

[0007] Against this backdrop, we provide a non-resonant end coil extension structure for single-resonance wireless charging to meet the needs of magnetic wireless charging for electric bicycles. This structure not only effectively solves the problem of charging instability caused by changes in inductance when the extension structure of the transmitter end changes, but also designs the transmitter end coil extension line to consist of two flat and parallel conductors with closely arranged Litz wire windings, with an outer copper mesh structure and rubber insulation layer, which can effectively increase the current and reduce radiation. Summary of the Invention

[0008] In view of the above, the first objective of the present invention is to provide a non-resonant coil extension line for a wireless charging system, which overcomes the problems of high cost and limited power caused by the coaxiality of traditional coil extension lines. The non-resonant coil extension line of the present invention effectively increases current and reduces radiation.

[0009] The second objective of this invention is to provide a non-resonant inductance compensation circuit for a wireless charging system, which compensates for the inductance during the winding or stretching of the aforementioned non-resonant coil extension line, thereby eliminating the effect of inductance attenuation.

[0010] To achieve the aforementioned first objective, the technical solution adopted by the present invention is to provide a non-resonant coil extension line for a wireless charging system. The non-resonant coil extension line is disposed in a non-resonant terminal circuit, which includes a transmitter control circuit, the non-resonant coil extension line, and a transmitter non-resonant coil. The non-resonant coil extension line has a first connecting end, a second connecting end, and an extension structure. The first connecting end is connected to the transmitter control circuit; the second connecting end is connected to the transmitter non-resonant coil; the extension structure is integrally formed in a coiled manner between the first connecting end and the second connecting end. The non-resonant coil extension line includes a first conductor, a second conductor, a dielectric layer, a grounding copper mesh, and an insulating layer. The first conductor, the dielectric layer, and the second conductor are stacked to form a conductive structure along the extension direction of the non-resonant coil extension line, and the dielectric layer separates the first conductor and the second conductor. The grounding copper mesh covers the outside of the conductive structure, and the insulating layer covers the outside of the grounding copper mesh.

[0011] A further improvement of the non-resonant coil extension line of the present invention is that the extension structure of the non-resonant coil extension line is a spiral structure coiled into a disk shape.

[0012] A further improvement of the non-resonant coil extension line of the present invention is that the extension structure of the non-resonant coil extension line is a spiral structure coiled into a cylindrical shape.

[0013] A further improvement of the non-resonant coil extension line of the present invention is that the first conductor and the second conductor of the non-resonant coil extension line are flat strips formed by winding Litz wire.

[0014] A further improvement of the non-resonant coil extension line of the present invention is that the transmitting coil is housed inside a transmitting magnetic attraction structure.

[0015] To achieve the second objective mentioned above, the technical solution adopted by the present invention is to provide a non-resonant end inductance compensation circuit for a wireless charging system. The non-resonant end inductance compensation circuit includes the transmitter control circuit, the non-resonant coil extension line as described above, the transmitter non-resonant coil, and the inductance compensation circuit. The inductance compensation circuit and the transmitter control circuit are connected to form a current loop to detect the inductance change of the transmitter non-resonant coil, and to compensate the inductance of the transmitter non-resonant coil according to the inductance change.

[0016] A further improvement of the non-resonant inductance compensation circuit of the present invention is that the transmitting end control circuit includes an inverter circuit, an inductance detection device, and a switch control device. The inverter circuit is electrically connected to the transmitting end non-resonant coil. The inductance detection device and the inductance compensation circuit are electrically connected between the inverter circuit and the transmitting end non-resonant coil, with the inductance compensation circuit located between the inductance detection device and the transmitting end non-resonant coil. The switch control device is electrically connected between the inductance detection device and the inductance compensation circuit. Thus, the inductance detection device detects changes in the inductance of the transmitting end non-resonant coil to generate and output a control signal to the switch control device. The switch control device electrically controls the inductance compensation circuit to either start compensating for the inductance or turn it off according to the control signal.

[0017] A further improvement of the non-resonant inductance compensation circuit of the present invention is that the inductance compensation circuit is an LC circuit, which includes a control switch, an inductor, and a capacitor. Accordingly, the switch control device electrically controls the control switch to conduct with the inductor and capacitor based on the control signal, so that the LC circuit is connected to the non-resonant circuit to compensate for the inductance; or, it electrically controls the control switch to disconnect from the inductor and capacitor, so that the LC circuit forms an open circuit.

[0018] A further improvement of the non-resonant inductance compensation circuit of the present invention is that the inductance compensation circuit is an LCC circuit, which includes a control switch, an inductor, a first capacitor, and a second capacitor. Accordingly, the switch control device, based on the control signal, electrically controls the control switch to conduct with the inductor, the first capacitor, and the second capacitor so that the LCC circuit is connected to the non-resonant circuit to compensate for the inductance; or, it electrically controls the control switch to disconnect from the inductor, the first capacitor, and the second capacitor so that the LCC circuit forms an open circuit.

[0019] A further improvement of the non-resonant inductance compensation circuit of the present invention is that the inductance compensation circuit is an LCL circuit, which includes a control switch, a first inductor, a second inductor, and a capacitor. Accordingly, the switch control device, based on the control signal, electrically controls the control switch to conduct with the first inductor, the second inductor, and the capacitor to connect the LCL circuit to the non-resonant circuit for inductance compensation; or, electrically controls the control switch to disconnect from the first inductor, the second inductor, and the capacitor to create an open circuit in the LCL circuit.

[0020] Because the present invention adopts the above technical solution, it has the following beneficial effects:

[0021] (1) The non-resonant coil extension line provided by the present invention achieves the telescopic function through its spiral extension structure to meet the wireless charging needs when the vehicle is parked at different distances.

[0022] (2) The non-resonant coil extension line with extension function provided by the present invention is independent of the transmitter control circuit, which can reduce the weight of the coil operated by the user and improve the feasibility of the technical solution of the present invention.

[0023] (3) The non-resonant end inductance compensation circuit provided by the present invention can monitor the change of the inductance of the non-resonant end through an inductance detection device, and compensate or not compensate the inductance.

[0024] (4) The non-resonant coil extension line of the present invention can effectively reduce coil radiation, reduce energy consumption, and increase current by using a conductor made of flat and parallel Litz wire winding conductor.

[0025] These and other objects, features and advantages of the present invention will be fully realized by the following detailed description and claims, and may be achieved by the means, apparatus and combinations thereof specifically pointed out in the appended claims. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the appearance of the first embodiment of the extension structure of the non-resonant coil extension line of the present invention.

[0027] Figure 2 This is a schematic diagram of the appearance of the second embodiment of the extension structure of the non-resonant coil extension line of the present invention.

[0028] Figure 3 This is a perspective view of the linear structure of the non-resonant coil extension line of the present invention.

[0029] Figure 4 This is a schematic diagram of the architecture of the non-resonant end inductance compensation circuit of the present invention.

[0030] Figure 5 This is a schematic diagram of the first embodiment of the non-resonant terminal inductance compensation circuit of the present invention.

[0031] Figure 6 This is a schematic diagram of the second embodiment of the non-resonant terminal inductance compensation circuit of the present invention.

[0032] Figure 7 This is a schematic diagram of the third embodiment of the non-resonant terminal inductance compensation circuit of the present invention.

[0033] The correspondence between the reference numerals and the components in the attached drawings is as follows:

[0034] Non-resonant coil extension line 10; first connection end 11; second connection end 12; extension structure 13; first conductor 101; second conductor 102; dielectric layer 103; grounding copper mesh 104; insulating layer 105; transmitter magnetic attraction structure 20; inverter circuit 30; inductance detection device 40; switch control device 50; inductance compensation circuit 60; LC circuit 60A; LCC circuit 60B; LCL circuit 60C; control switch S; contact 1; contact 2; contact 3; contact 4; transmitter non-resonant coil L1; inductor L; capacitor C; first inductor L2; second inductor L3; first capacitor C1; second capacitor C2; receiver control circuit 70; receiver coil 71. Detailed Implementation

[0035] Detailed embodiments of the present invention will be disclosed herein. However, it should be understood that the disclosed embodiments are merely typical examples of the invention, and the invention can be implemented in various alternative forms. Therefore, the specific structural and functional details disclosed herein are not limiting, but merely representative of different implementation methods for illustrating to those skilled in the art.

[0036] To facilitate understanding of the present invention, the following description is provided in conjunction with the appendix. Figures 1 to 7 The following description is provided, along with examples.

[0037] Please see Figure 1 , Figure 2 and Figure 4 This invention provides a non-resonant coil extension line and a non-resonant inductance compensation circuit applied in a single-resonance wireless charging non-resonant terminal circuit. The non-resonant terminal circuit includes a transmitter control circuit, a non-resonant coil extension line 10, and an inductance compensation circuit 60; wherein, as... Figure 1 , Figure 2 The non-resonant coil extension line 10 is as follows: Figure 1 , Figure 2 The molding incorporates a spiral structure to achieve an elongated function; such as Figure 4 The transmitting end control circuit includes the non-resonant coil extension line 10, the transmitting end non-resonant coil L1, the inverter circuit 30, the inductance detection device 40, and the switch control device 50. The inductance compensation circuit 60 is used to form a current loop with the inverter circuit 30 to detect the inductance change of the transmitting end non-resonant coil L1 and to compensate the inductance of the transmitting end non-resonant coil L1 according to the inductance change.

[0038] like Figure 1 , Figure 2The non-resonant coil extension wire of the present invention has a first connecting end 11, a second connecting end 12, and an extension structure 13. The first connecting end 11 is connected to the non-resonant terminal circuit. The extension structure 13 is integrally formed in a spiral shape between the first connecting end 11 and the second connecting end 12. The extension structure 13 of the non-resonant coil extension wire 10 of the present invention is a retractable independent spiral structure and is placed in the electrical box independently of the transmitting end control circuit. The extension structure 13 saves space when stored by winding a spiral structure, and allows the coil to be extended and lengthened during use, adapting to the usage environment of electric bicycles.

[0039] In embodiments of the present invention, such as Figure 1 , Figure 2 and Figures 4 to 7 The second connection end 12 is also provided with a transmitter magnetic attraction structure 20. The transmitter non-resonant coil L1 is housed inside the transmitter magnetic attraction structure 20 and connected to the extension line 10 of the non-resonant coil. In this way, the transmitter magnetic attraction structure 20 and the receiver magnetic attraction structure of the receiver circuit are attracted and fixed, so that the transmitter non-resonant coil L1 of the non-resonant end (transmitter) circuit is precisely aligned with the coil of the receiver circuit, thereby improving the wireless charging efficiency.

[0040] A first embodiment of the extension structure of the non-resonant coil extension line of the present invention is as follows: Figure 1 As shown, the extension structure 13 is a spiral structure coiled into a disk shape. The first connecting end 11 and the second connecting end 12 extend outward from the extension structure 13 in the same plane and are connected to other components. In this way, the non-resonant coil extension line forms a coil structure with extension function through the disk-spiral extension structure 13.

[0041] A second embodiment of the extension structure of the non-resonant coil extension line of the present invention is as follows: Figure 2 As shown, the extension structure 13 is a spiral structure coiled into a cylindrical shape. The first connecting end 11 and the second connecting end 12 are respectively connected to the extension structure 13 along the same axial direction and then connected to other components. In this way, the non-resonant coil extension line forms a coil structure with extension function through the cylindrical spiral extension structure 13.

[0042] In an embodiment of the non-resonant coil extension line 10 of the present invention, the inductance of the non-resonant coil extension line 10 when it is wound is preferably 0.1-50uH.

[0043] In embodiments of the present invention, such as Figure 3As shown, the non-resonant coil extension line 10 includes a first conductor 101, a second conductor 102, a dielectric layer 103, a grounding copper mesh 104, and an insulating layer 105. The first conductor 101, the dielectric layer 103, and the second conductor 102 are stacked to form a conductor structure along the coil extension direction. The dielectric layer 103 separates the first conductor 101 and the second conductor 102. The first conductor 101, the second conductor 102, and the dielectric layer 103 together form the internal conductor of the non-resonant coil extension line 10. The grounding copper mesh 104 covers the outside of the conductor structure, and the insulating layer 105 covers the outside of the grounding copper mesh 104. The grounding copper mesh 104 and the insulating layer 105 together form an external shielding layer covering the internal conductor. Therefore, compared with existing coaxial conductors composed of two coaxial conductors, the non-resonant coil extension line 10 of the present invention has a conductor formed by the close arrangement of the first conductor 101 and the second conductor 102 inside, which can localize the electromagnetic field in the space near the two conductors; the external use of a grounded copper mesh structure (grounded copper mesh 104) can form a shielding layer, thereby more effectively shielding radiation, avoiding radiation loss, and increasing the current.

[0044] The first conductor 101 and the second conductor 102 are flat, elongated strips formed by winding Litz wire. The two strips are stacked in parallel and separated by a dielectric layer 103. The dielectric layer 103 is an elongated sandwich structure composed of air or an insulating medium. The insulating layer 105 is an insulating structure made of rubber. One end of the first conductor 101 and the second conductor 102 of the non-resonant coil extension line 10 is connected to the positive and negative terminals of the transmitting end control circuit, respectively, and the other end is connected to both ends of the transmitting end non-resonant coil L1, respectively.

[0045] like Figure 4 The diagram shows a schematic of the architecture of the non-resonant coil extension line 10 of the present invention applied to the non-resonant end inductance compensation circuit. The non-resonant end inductance compensation circuit includes the non-resonant coil extension line 10, the transmitting end non-resonant coil L1, the inverter circuit 30, the inductance detection device 40, the switch control device 50, and the inductance compensation circuit 60.

[0046] Specifically, the inverter circuit 30 and the transmitting end non-resonant coil L1 are electrically connected through the first conductor 101 and the second conductor 102 of the non-resonant coil extension line 10. The inductance detection device 40 and the inductance compensation circuit 60 are electrically connected between the inverter circuit 30 and the transmitting end non-resonant coil L1, with the inductance compensation circuit 60 located between the inductance detection device 40 and the transmitting end non-resonant coil L1. The switch control device 50 is electrically connected between the inductance detection device 40 and the inductance compensation circuit 60. Thus, the inductance detection device 40 detects changes in the inductance of the transmitting end non-resonant coil L1 to generate and output a control signal to the switch control device 50. The switch control device 50 electrically controls the inductance compensation circuit 60 to activate or deactivate the compensation inductor according to the control signal, thereby matching the inductance of the transmitting and receiving ends and enabling normal coupling for wireless power transmission.

[0047] A first embodiment of the inductance compensation circuit 60 of the present invention is as follows: Figure 5 As shown, the inductance compensation circuit 60 is an LC circuit 60A, which includes a control switch S, an inductor L, and a capacitor C. The control switch S has two pins and four contacts (contact 1, contact 2, contact 3, and contact 4), which are connected in parallel. Contact 1 is connected in series with the transmitting end non-resonant coil L1; contact 2 is connected in series with the inductor L and the transmitting end non-resonant coil L1, with the inductor L positioned between contact 2 and the transmitting end non-resonant coil L1; contact 3 is an open circuit; and contact 4 is connected in series with the capacitor C and the transmitting end non-resonant coil L1, with the capacitor C positioned between contact 4 and the transmitting end non-resonant coil L1.

[0048] In the first embodiment of the inductance compensation circuit 60 of the present invention, the control switch S is connected to the contacts 1 and 3 through the two pins, so that the contacts 1 of the control switch S and the non-resonant coil L1 of the transmitting end form a current loop connected to the inverter circuit 30, thereby so that the high-frequency AC current does not pass through the LC circuit 60A, that is, the LC circuit 60A is not connected to the non-resonant terminal circuit and there is no inductance compensation.

[0049] When the control switch S is connected to contacts 2 and 4 via its two pins, the LC circuit 60A is connected to the non-resonant terminal circuit. This causes contacts 2 of the control switch S, inductor L, transmitter non-resonant coil L1, capacitor C, and contact 4 to form a circuit loop connected to the inverter circuit 30. This allows high-frequency AC power to be transmitted through the LC circuit 60A first, and then to the transmitter non-resonant coil L1, thus achieving inductance compensation for the transmitter non-resonant coil L1, meeting the normal coupling requirements of the transmitter and receiver, and ensuring the efficiency of wireless charging.

[0050] A second embodiment of the inductance compensation circuit 60 of the present invention is as follows: Figure 6 As shown, the inductance compensation circuit 60 is an LCC circuit 60B. The LCC circuit 60B includes a control switch S, an inductor L, a first capacitor C1, and a second capacitor C2. The control switch S has two pins and four contacts (contact 1, contact 2, contact 3, and contact 4), which are connected in parallel. Contact 1 is connected in series with the transmitting end non-resonant coil L1. Contact 2 is connected in series with the inductor L, the first capacitor C1, and the transmitting end non-resonant coil L1. The inductor L and the first capacitor C1 are located between contact 2 and the transmitting end non-resonant coil L1, with the inductor L located between the first capacitor C1 and contact 2. Contact 3 is an open circuit. Contact 4 is connected in series with the second capacitor C2 and the transmitting end non-resonant coil L1, with the second capacitor C2 located between contact 4 and the transmitting end non-resonant coil L1.

[0051] In the second embodiment of the inductance compensation circuit 60 of the present invention, the control switch S is connected to the contacts 1 and 3 through the two pins, so that the contacts 1 of the control switch S and the non-resonant coil L1 of the transmitting end form a current loop connected to the inverter circuit 30, thereby so that the high-frequency AC current does not pass through the LCC circuit 60B, that is, the LCC circuit 60B is not connected to the non-resonant terminal circuit and there is no inductance compensation.

[0052] When the control switch S is connected to contacts 2 and 4 via the two pins, the LCC circuit 60B is connected to the non-resonant terminal circuit. This causes contacts 2, inductor L, first capacitor C1, transmitter non-resonant coil L1, second capacitor C2, and contact 4 of the control switch S to form a circuit loop connected to the inverter circuit 30. This allows high-frequency AC power to be transmitted through the LCC circuit 60B first, and then to the transmitter non-resonant coil L1, thus achieving inductance compensation for the transmitter non-resonant coil L1, meeting the normal coupling requirements of the transmitter and receiver, and ensuring the efficiency of wireless charging.

[0053] A third embodiment of the inductance compensation circuit 60 of the present invention, for example Figure 7As shown, the inductance compensation circuit 60 is an LCL circuit 60C. The LCL circuit 60C includes a control switch S, a first inductor L2, a second inductor L3, and a capacitor C. The control switch S has two pins and four contacts (contact 1, contact 2, contact 3, and contact 4), which are connected in parallel. Contact 1 is connected in series with the transmitting end non-resonant coil L1. Contact 2 is connected in series with the first inductor L2 and the transmitting end non-resonant coil L1, with the first inductor L2 positioned between contact 2 and the transmitting end non-resonant coil L1. Contact 3 is an open circuit. Contact 4 is connected in series with the capacitor C, the second inductor L3, and the transmitting end non-resonant coil L1, with the capacitor C and the second inductor L3 positioned between contact 4 and the transmitting end non-resonant coil L1, and the capacitor C positioned between the second inductor L3 and contact 4.

[0054] In the second embodiment of the inductance compensation circuit 60 of the present invention, the control switch S is connected to the contacts 1 and 3 through the two pins, so that the contacts 1 of the control switch S, the non-resonant coil L1 of the transmitting end, and the second inductor L3 form a current loop connected to the inverter circuit 30, thereby preventing the high-frequency AC power from passing through the LCL circuit 60C, that is, the LCL circuit 60C is not connected to the non-resonant terminal circuit and there is no inductance compensation.

[0055] When the control switch S is connected to contacts 2 and 4 via its two pins, the LC circuit 60A is connected to the non-resonant terminal circuit. This causes contacts 2 of the control switch S, the first inductor L2, the transmitting non-resonant coil L1, the second inductor L3, the capacitor C, and contact 4 to form a circuit loop connected to the inverter circuit 30. This allows high-frequency AC power to be transmitted through the LC circuit 60A first, and then to the transmitting non-resonant coil L1, thus achieving inductance compensation for the transmitting non-resonant coil L1, meeting the normal coupling requirements of the transmitting and receiving ends, and ensuring the efficiency of wireless charging.

[0056] In summary, this invention provides a non-resonant end inductance compensation circuit for single-resonance wireless charging, which can meet the requirements of magnetic wireless charging for electric bicycles, effectively solving the charging instability problem caused by the change in inductance when the extension line 10 of the non-resonant coil at the transmitting end of the electric bicycle is extended; and by designing the wire of the non-resonant coil extension line 10 as a flat and closely arranged conductor formed by two Litz wires wound around it as an internal conductor, and covering the conductor with a grounded copper mesh 104 and an insulating layer 105, the current is effectively increased and the radiation is reduced.

[0057] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A non-resonant inductance compensation circuit for a wireless charging system, characterized in that, The non-resonant inductance compensation circuit is used in the non-resonant circuit of single-resonance wireless charging. The non-resonant inductance compensation circuit includes a transmitter control circuit, a non-resonant coil extension line, a transmitter non-resonant coil, and an inductance compensation circuit. The non-resonant coil extension line has a first connection end, a second connection end, and an extension structure. The first connection end is connected to the transmitter control circuit, the second connection end is connected to the transmitter non-resonant coil, and the extension structure is integrally formed between the first connection end and the second connection end in a coiled manner. The inductance compensation circuit and the transmitter control circuit are connected to form a current loop to detect the inductance change of the transmitter non-resonant coil and perform inductance compensation on the transmitter non-resonant coil according to the inductance change.

2. The non-resonant end inductance compensation circuit of the wireless charging system according to claim 1, characterized in that, The transmitter control circuit includes an inverter circuit, an inductor detection device, and a switch control device, wherein: The inverter circuit is electrically connected to the non-resonant coil of the transmitting end, the inductance detection device and the inductance compensation circuit are electrically connected between the inverter circuit and the non-resonant coil of the transmitting end, and the inductance compensation circuit is located between the inductance detection device and the non-resonant coil of the transmitting end. The switch control device is electrically connected between the inductance detection device and the inductance compensation circuit. In this way, the inductance detection device detects the change in inductance of the non-resonant coil at the transmitting end to form and output a control signal to the switch control device, and the switch control device electrically controls the inductance compensation circuit to start or stop compensating the inductance according to the control signal.

3. The non-resonant end inductance compensation circuit of the wireless charging system according to claim 2, characterized in that: The inductance compensation circuit is an LC circuit, which includes a control switch, an inductor, and a capacitor. Accordingly, the switch control device electrically controls the control switch to be connected to the inductor and capacitor to connect the LC circuit to the non-resonant terminal circuit to compensate for the inductance, or electrically controls the control switch to be disconnected from the inductor and capacitor to form an open circuit in the LC circuit.

4. The non-resonant end inductance compensation circuit of the wireless charging system according to claim 2, characterized in that: The inductance compensation circuit is an LCC circuit, which includes a control switch, an inductor, a first capacitor, and a second capacitor. Accordingly, the switch control device electrically controls the control switch to conduct with the inductor, the first capacitor, and the second capacitor according to the control signal, so that the LCC circuit is connected to the non-resonant terminal circuit to compensate for the inductance; or, it electrically controls the control switch to disconnect with the inductor, the first capacitor, and the second capacitor, so that the LCC circuit is open-circuited.

5. The non-resonant end inductance compensation circuit of the wireless charging system according to claim 2, characterized in that: The inductance compensation circuit is an LCL circuit, which includes a control switch, a first inductor, a second inductor, and a capacitor. Accordingly, the switch control device electrically controls the control switch to conduct with the first inductor, the second inductor, and the capacitor according to the control signal, so that the LCL circuit is connected to the non-resonant terminal circuit to compensate for the inductance; or, it electrically controls the control switch to disconnect with the first inductor, the second inductor, and the capacitor, so that the LCL circuit is open-circuited.

6. The non-resonant end inductance compensation circuit of the wireless charging system according to claim 1, characterized in that, The non-resonant coil extension line includes a first conductor, a second conductor, a dielectric layer, a grounding copper mesh, and an insulating layer; wherein, the first conductor, the dielectric layer, and the second conductor are stacked to form a conductor structure and are arranged along the extension direction of the non-resonant coil extension line, and the dielectric layer is provided to separate the first conductor and the second conductor; the grounding copper mesh covers the outside of the conductor structure, and the insulating layer covers the outside of the grounding copper mesh.

7. The non-resonant end inductance compensation circuit of the wireless charging system according to claim 6, characterized in that: The extension structure of the non-resonant coil extension line is a spiral structure that is coiled into a disk shape.

8. The non-resonant inductance compensation circuit of the wireless charging system according to claim 6, characterized in that: The extension structure of the non-resonant coil extension line is a spiral structure that is coiled into a cylindrical shape.

9. The non-resonant end inductance compensation circuit of the wireless charging system according to claim 6, characterized in that: The first and second conductors of the non-resonant coil extension line are flat, elongated strips formed by winding Litz wire.

10. The non-resonant end inductance compensation circuit of the wireless charging system according to claim 6, characterized in that: The non-resonant coil of the transmitting end is housed inside a magnetically attached structure of the transmitting end.

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