Multi-channel wireless power transfer system coupler and equivalent circuit modeling method thereof

Abstract

This invention discloses a coupler for a multi-channel wireless power transfer system and its equivalent circuit modeling method. The coupler includes: multiple channels arranged side by side, each channel including a transmitter plate group and a receiver plate group, the transmitter plate group including a first plate and a second plate, and the receiver plate group including a third plate and a fourth plate; two shielding plates located outside the channels, each shielding plate including an outer shielding plate, an inner shielding plate, and a side shielding plate, the outer shielding plate being configured to cover the first, second, third, and fourth plates of all channels, and the inner shielding plate being configured to cover the first and third plates of all channels; and two glass plates located between the first plate and the inner shielding plate, and between the third plate and the inner shielding plate, respectively. This invention can achieve power equalization of each channel when the mutual capacitance between channels is inconsistent.

Description

Technical Field

[0001] This invention belongs to the field of wireless charging, and more specifically, relates to a coupler for a multi-channel wireless power transmission system and a method for modeling its equivalent circuit. Background Technology

[0002] Capacitive wireless power transfer (CWPT) technology has attracted increasing attention due to its advantages such as simple transmission mechanism structure, no eddy current loss, low cost, and light weight.

[0003] Currently, CWPT technology is mostly still in the research and experimental stage, with limited practical applications, especially for high-power, high-voltage applications. Single-channel CWPT systems cannot meet the requirements due to the voltage rating limitations of the switching devices. Multi-channel CWPT systems, composed of multiple single-channel systems, are an effective solution to this problem. However, when the mutual capacitance between channels in a multi-channel system is inconsistent, an imbalance in the output power of each channel can occur. Long-term operation can lead to excessive load on one channel, affecting the overall lifespan of the system.

[0004] In summary, there is an urgent need to develop a multi-channel CWPT system capable of achieving power equalization and having the ability to operate stably for a long period of time. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a multi-channel wireless power transmission system coupler and its equivalent circuit modeling method, which can achieve power balance among channels when the mutual capacitance between channels is inconsistent.

[0006] To achieve the above objectives, according to one aspect of the present invention, a multi-channel wireless power transfer system coupler is provided, comprising: Multiple channels are arranged side by side. Each channel includes a transmitter electrode group and a receiver electrode group. The transmitter electrode group includes a first electrode and a second electrode. The receiver electrode group includes a third electrode and a fourth electrode. The first electrode and the third electrode are coupled to each other. The second electrode and the fourth electrode are coupled to each other. Two shielding plates are provided. One shielding plate is located on the outer side of the transmitter electrode group away from the receiver electrode group, and the other shielding plate is located on the outer side of the receiver electrode group away from the transmitter electrode group. Each shielding plate includes an outer shielding plate, an inner shielding plate, and a side shielding plate connecting the outer shielding plate and the inner shielding plate. The outer shielding plate is located away from the channel relative to the inner shielding plate, and the area of ​​the outer shielding plate is larger than that of the inner shielding plate. The outer shielding plate is configured to cover the first, second, third, and fourth electrodes of all channels. The inner shielding plate is configured to cover the first and third electrodes of all channels, but not the second and fourth electrodes of all channels. The two relative permittivity are The fifth and sixth electrodes are located between the first electrode of all channels and the inner shield of a shielding plate, and the sixth electrode is located between the third electrode of all channels and the inner shield of another shielding plate. ≥2.

[0007] Preferably, the first electrode plate, the second electrode plate, the third electrode plate, and the fourth electrode plate are four identical rectangular aluminum plates.

[0008] Preferably, the outer shielding plate is parallel to the inner shielding plate, and the side shielding plate is perpendicular to the outer shielding plate.

[0009] Preferably, the length of the inner shielding plate is the same as the length of the outer shielding plate, and the width of the inner shielding plate is half the width of the outer shielding plate. The length is defined as the length in all directions of the first electrode plate arrangement, and the width is defined as the length in the direction from the first electrode plate to the second electrode plate.

[0010] Preferably, one side of the fifth electrode plate is in contact with the first electrode plate of all channels, the other side of the fifth electrode plate is in contact with the inner shielding plate of a shielding plate, one side of the sixth electrode plate is in contact with the third electrode plate of all channels, and the other side of the sixth electrode plate is in contact with the inner shielding plate of another shielding plate.

[0011] Preferably, the first electrode plate, the second electrode plate, the third electrode plate, the fourth electrode plate, the fifth electrode plate, the sixth electrode plate, the outer shielding plate, and the inner shielding plate are all parallel.

[0012] Preferably, both the fifth and sixth electrode plates are glass plates.

[0013] Preferably, the dimensions of the fifth and sixth electrode plates are the same as those of the inner shielding plate.

[0014] According to another aspect of the present invention, an equivalent circuit modeling method for a multi-channel wireless power transfer system coupler as described above is provided, wherein an equivalent circuit model is established for the multi-channel wireless power transfer system coupler, the equivalent circuit model including... nThere are several parallel channels, each channel including a first plate, a second plate, a third plate, a fourth plate, a primary-side self-capacitance, a secondary-side self-capacitance, and mutual capacitance (this description is convenient because self-capacitance and mutual capacitance are actually generated by coupling between the plates, but this description makes it seem like there is a capacitor added between the plates). The primary-side self-capacitance is connected in series between the first and second plates, the secondary-side self-capacitance is connected in series between the third and fourth plates, and the mutual capacitance is connected in series between the first and third plates. The second and fourth plates are electrically connected. A capacitor is connected between the first plates of any two channels, and a capacitor is connected between the third plates of any two channels.

[0015] Preferably, the formula for calculating the capacitance in the equivalent circuit model is: ; in, This represents the primary-side self-capacitance of the i-th channel. This represents the mutual capacitance of the i-th channel. This represents the secondary-side self-capacitance of the i-th channel. Indicates the first i One channel transmission plate x With the j-th channel transmission plate y The capacitance between, superscript i , j Indicates the channel number, subscript x and y Indicates the electrode plate number. C i xy Indicates the first i One channel transmission plate x and transmission plates y Coupling capacitance between them C i xU Indicates the first i One channel transmission plate x and shielding plate P U Coupling capacitance between them C i xL Indicates the first i One channel transmission plate x and shielding plate P L Coupling capacitance between them Indicates the first j One channel transmission plate x and shielding plate P U Coupling capacitance between them Indicates the first i One channel transmission plate x and shielding plate P L Coupling capacitance between them CUL This represents the coupling capacitance between the upper and lower shielding plates.

[0016] Overall, compared with the prior art, the above-mentioned technical solutions conceived in this invention can achieve power balance in each channel and small output voltage difference in each channel even when the mutual capacitance of each channel is inconsistent. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the coupler of the multi-channel wireless power transfer system according to an embodiment of the present invention; Figure 2 This is a front view of the coupler of the multi-channel wireless power transfer system according to an embodiment of the present invention; Figure 3 This is a left view of the coupler of the multi-channel wireless power transfer system according to an embodiment of the present invention; Figure 4 This is a schematic diagram showing the dimensions of the coupler in a multi-channel wireless power transfer system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the inter-plate coupling capacitor of a single-channel wireless power transfer system coupler according to an embodiment of the present invention; Figure 6 This is the equivalent coupling capacitance model of the coupler in the multi-channel wireless power transmission system of this invention. Figure 7 This is the equivalent circuit model of the coupler in the multi-channel wireless power transfer system according to an embodiment of the present invention; Figure 8 This is a simulation circuit diagram of a multi-channel CWPT system for a multi-channel wireless power transfer system coupler according to an embodiment of the present invention; Figure 9 The output voltage waveform of the multi-channel CWPT system is shown in the figure when the multi-channel wireless power transfer system coupler is configured according to an embodiment of the present invention and the mutual capacitance of the channels is consistent. Figure 10 The output voltage waveform of the multi-channel CWPT system is shown when the multi-channel wireless power transfer system coupler of this embodiment is not configured and the channel mutual capacitances are inconsistent. Figure 11 The output voltage waveform of the multi-channel CWPT system is shown in the figure when the multi-channel wireless power transfer system coupler is configured according to an embodiment of the present invention and the mutual capacitance of the channels is inconsistent. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0019] In the description of the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of that feature. "Multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this embodiment of the invention, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, apparatus, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to such process, method, product or device.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] This invention provides a coupler for a multi-channel wireless power transfer system and a method for modeling its equivalent circuit, which will be described below.

[0023] An embodiment of the present invention provides a multi-channel wireless power transfer system coupler capable of achieving power equalization, comprising: Multiple channels are arranged side by side. Each channel includes a transmitter electrode group and a receiver electrode group. The transmitter electrode group includes a first electrode and a second electrode. The receiver electrode group includes a third electrode and a fourth electrode. The first electrode and the third electrode are coupled to each other. The second electrode and the fourth electrode are coupled to each other. The first electrode, the second electrode, the third electrode, and the fourth electrode can also be used as transmission electrodes. Two shielding plates are used. The shielding plates are made of the same material as the transmitting and receiving electrode plates, typically aluminum or copper. One shielding plate is located on the outer side of the transmitting electrode plate group, away from the receiving electrode plate group, and the other shielding plate is located on the outer side of the receiving electrode plate group, away from the transmitting electrode plate group. Each shielding plate includes an outer shielding plate, an inner shielding plate, and a side shielding plate connecting the outer and inner shielding plates. The outer shielding plate is located further away from the channel than the inner shielding plate, and its area is larger than that of the inner shielding plate. The outer shielding plate is configured to cover the first and second electrode plates of the entire channel. The first, second, third, and fourth pole plates, i.e., the orthographic projections of the first, second, third, and fourth pole plates onto the plane of the outer shielding plate are all on the outer shielding plate and do not extend beyond it. The inner shielding plate is configured to cover the first and third pole plates, i.e., the orthographic projections of the first and third pole plates onto the plane of the inner shielding plate are all on the inner shielding plate and do not extend beyond it. The second and fourth pole plates, which cannot cover all channels, i.e., the orthographic projections of the second and fourth pole plates onto the plane of the inner shielding plate do not coincide with the inner shielding plate. The two relative permittivity are The fifth and sixth plates are arranged such that the fifth plate is located between the first plate of all channels and the inner shield of a shielding plate, and the sixth plate is located between the third plate of all channels and the inner shield of another shielding plate. The relative permittivity of the fifth and sixth plates satisfies the following condition. ≥2, for example, glass, polyethylene, etc. The glass plate is located between the transmission plate and the inner shielding plate in the coupler, and acts as the transmission medium. Since the relative permittivity of glass is relatively large, usually around 4, while that of air is around 1, the coupling capacitance between the transmission plate and the inner shielding plate will be very large.

[0024] The multi-channel wireless power transfer system coupler of this invention can achieve channel power equalization. Achieving channel power equalization means equalizing the output power of each channel. Since the secondary side is connected in series, the output current of each channel is the same, thus achieving output power equalization, which is equivalent to output voltage equalization. To achieve output voltage equalization of each channel, this invention mainly uses the construction of "current-sharing capacitors" between the channels, with two relative permittivity values ​​of... The fifth and sixth plates are used to construct a large capacitor. The shielding plate adopts a semi-U-shaped structure to ensure that... Figure 7 As shown, large capacitors are constructed only between the first plates of different channels and between the third plates of different channels. There are no requirements for the size of the inner plate of the shielding plate, as long as it can completely cover the first and third plates of each channel.

[0025] Furthermore, both the fifth and sixth plates are glass plates. The relative permittivity of the glass plate is 4-7 times that of air. Couplers fabricated according to the dimensions shown in Table 1, measured by a bridge circuit, show a capacitance of 70 pF between the transmission plate and the shielding plate on the side without the glass plate, while the capacitance between the transmission plate and the shielding plate on the side with the glass plate is 1.5 nF.

[0026] Furthermore, the dimensions of the first, second, third, and fourth electrodes of all channels are the same, the dimensions of the shielding plates of all channels are the same, and the dimensions of the fifth and sixth electrodes of all channels are the same.

[0027] Another embodiment of the multi-channel wireless power transfer system coupler of the present invention is shown in the following figures: (3D view, front view, left view, and dimension diagram). Figures 1 to 4 As shown. Each channel of the coupler consists of four identical rectangular aluminum plates, where P i1 and P i2 The first and second electrodes of the i-th channel constitute the transmitter electrode group, where 1 and 2 represent electrode numbers. i3 and P i4 The third and fourth electrodes of the i-th channel constitute the receiving electrode group, where 3 and 4 represent electrode numbers, 1 ≤ i ≤ n, and n is the total number of channels. P U This indicates the upper shielding plate, which includes the outer shielding plate P. U1 Inner shielding plate P U2 and side shielding plate P U3 P L These represent the lower shielding plate, which includes the outer shielding plate P. L1 Inner shielding plate P L2 and side shielding plate P L3 The shielding plate has a semi-U-shaped structure, and the glass plate P BU Located in the inner shielding plate P U2 and electrode plate P n3 Between, glass plate P BL Located in the inner shielding plate P L2 and electrode plate P n1 The thickness of all aluminum plates is t1. The thickness of all glass plates is t2. The transmission plate size is l3×l4, where l3 and l4 represent the length and width. The glass plate size is l1×l2 / 2, where l1 and l2 / 2 represent the length and width. The shielding plate can be composed of three aluminum plates: an outer shielding plate, an inner shielding plate, and a side shielding plate connecting the outer and inner shielding plates. Their dimensions are l1×l2, l1×l2 / 2, and d2×l2 / 2, respectively. d1 represents the transmission distance, d2 represents the distance between the outer and inner shielding plates, d3 represents the channel spacing distance, and d4 represents the distance between the transmitting plates within each channel.

[0028] Furthermore, the outer shielding plate is parallel to the inner shielding plate, and the side shielding plate is perpendicular to the outer shielding plate.

[0029] Furthermore, one side of a glass plate contacts the first electrode plate of all channels, and the other side of the glass plate contacts the inner shielding plate of a shielding plate. One side of another glass plate contacts the third electrode plate of all channels, and the other side of the glass plate contacts the inner shielding plate of another shielding plate. In direct contact, it is equivalent to the transmission medium between the first electrode plate and the inner shielding plate being glass, resulting in a very large coupling capacitance between the first electrode plate and the inner shielding plate.

[0030] Furthermore, the first electrode plate, the second electrode plate, the third electrode plate, the fourth electrode plate, the outer shielding plate, and the inner shielding plate are all parallel.

[0031] To analyze the power equalization effect of the coupler, the coupler is first modeled, and its equivalent circuit model is established. Based on the mechanism of capacitance generation, coupling capacitance will be generated between any two aluminum plates in the coupler. To simplify the analysis, the cross-coupling between transmission plates of different channels is not considered in this embodiment. Therefore, equivalent coupling capacitance models for single and multi-channel applications can be established, such as... Figures 5 to 6 As shown. Based on the mechanism of capacitance generation, there is a coupling capacitance between any two plates. (Using a channel...) i For example, the coupling capacitor is defined as C i xy superscript i Indicates the channel number, subscript x and y This indicates the electrode plate number, and so on, for the transmission electrode plate and shielding plate P. U The coupling capacitance between them is denoted as C i xU Transmission plate and shielding plate P L The coupling capacitance between them is denoted as C i xL The coupling capacitance between the upper and lower shielding plates is denoted as C. UL Furthermore, the capacitance between the transmission plates of different channels is defined as... C ij xy superscript i, j Indicates the channel number, subscript x and y Indicates the electrode plate number.

[0032] Based on the series and parallel relationship of capacitors, it can be... Figure 5 The equivalent coupling capacitance model shown is equivalent to: Figure 6 The equivalent circuit model is shown. Figure 5The diagram shows all the coupling capacitors formed between the four transmission plates and the shielding plate in one channel of an embodiment of the present invention, totaling 15. Figure 6 That is in Figure 5 Based on this, the total capacitance formed between the transmission plates and shielding plates of multiple channels is shown. Figure 6 Based on this, and according to the series and parallel relationships of the capacitors, the capacitance between any two plates in all transmission plates and shielding plates can be calculated.

[0033] Figure 6 The calculation expressions for the self-capacitance and mutual capacitance of the primary and secondary sides of each channel, as well as the capacitance between the plates of different channels, are as follows: (1) (2) in, This represents the primary-side self-capacitance of the i-th channel. This represents the mutual capacitance of the i-th channel. This represents the secondary side self-capacitance of the i-th channel.

[0034] according to Figure 6 The coupler full-capacitance model shown uses the series-parallel relationship of capacitors to treat each plate as a node, allowing the calculation of the coupling capacitance between any two plates in the coupler. Since a glass plate is added to one side of the coupler, the coupling capacitance between the transmission plate and the shielding plate on the side with the glass plate is much greater than that on the side without the glass plate. Finite element simulations were performed in ANSYS software based on the parameters shown in Table 1. The results show that the coupling capacitance between the transmission plate and the shielding plate on the side with the glass plate reaches approximately 1.6 nF, while the coupling capacitance between the transmission plate and the shielding plate on the side without the glass plate is only about 70 pF. Therefore, according to equation (1), the coupling capacitance between the first plates of different channels is 800 pF, the capacitance between the first and third plates of different channels is 30 pF, the capacitance between the first and second plates of different channels is 70 pF, and the capacitance between the first and fourth plates of different channels is 35 pF. Therefore, the capacitance between the transmission plates of different channels only considers the coupling capacitance between the first plates of different channels and the coupling capacitance between the third plates of different channels.

[0035] Based on the above analysis, an equivalent circuit modeling method for a multi-channel wireless power transfer system coupler according to an embodiment of the present invention establishes an equivalent circuit model for the aforementioned multi-channel wireless power transfer system coupler. The equivalent circuit model is as follows: Figure 7 As shown, the equivalent circuit model includes nEach channel consists of a first plate, a second plate, a third plate, a fourth plate, a primary-side self-capacitance, a secondary-side self-capacitance, and mutual capacitance. The primary-side self-capacitance is connected in series between the first and second plates, the secondary-side self-capacitance is connected in series between the third and fourth plates, and the mutual capacitance is connected in series between the first and third plates. The second and fourth plates are electrically connected. A capacitor is connected between the first plates of any two channels, and a capacitor is connected between the third plates of any two channels.

[0036] The formulas for calculating the primary side self-capacitance, secondary side self-capacitance, and mutual capacitance are the same as those in formula (1) above.

[0037] The capacitance between the first plates of any two channels is calculated using formula (2), where x=1 and y=1. The capacitance between the third plates of any two channels is calculated using formula (2), where x=3 and y=3.

[0038] The total coupling capacitance of the multi-channel coupler can be calculated using equations (1) and (2), including the self-capacitance and mutual capacitance of the primary and secondary sides in each channel, as well as the capacitance between the transmission plates of different channels. This allows for the calculation of the total coupling capacitance of the multi-channel coupler. Figure 6 Equivalent to Figure 7 The circuit model shown.

[0039] Table 1 System Basic Parameters ; To verify the effectiveness of this invention, a system was built in Simulink as follows. Figure 8 The circuit model shown is illustrated in Table 1, with model parameters listed below. Channel 1 and Channel... n The outer channel is channel 1, and channels 2, 3, ..., (n-1) are inner channels. Figure 8 The parameters in the document are explained. Indicates the compensating inductance, where , Indicates the compensation capacitor. This represents the series capacitance of the equivalent Z-parameter voltage source model for channel i coupler. , , This represents the coupling coefficient. This indicates that channel i outputs DC voltage. This represents the load voltage. Simulations were conducted for each channel output with the coupler of this invention configured and with consistent channel mutual capacitance, without the coupler of this invention configured and with inconsistent channel mutual capacitance, and with the coupler of this invention configured and with inconsistent channel mutual capacitance. The results are as follows. Figures 9-11 As shown. Consistent channel mutual capacitance means that the coupler plates of each channel are aligned, while inconsistent channel mutual capacitance means that a certain channel coupler has shifted, resulting in a change in mutual capacitance. It can be seen that when the coupler of this invention is configured and the channel mutual capacitance is consistent, the system output result is as follows:Figure 9 As shown, when the mutual capacitance of the channels is consistent, the output voltage of each channel is consistent. Furthermore, since the output terminals are connected in series, the output power of each channel is balanced, indicating that the use of the coupler of this invention has no effect when the parameters of each channel are consistent. Figure 10 This indicates that when the coupler of the present invention is not configured and the mutual capacitance of the channels is inconsistent, there is a significant imbalance in the output of each channel, with a large difference in output voltage between channels, up to a maximum of 5.6V. Figure 11 This indicates that after configuring the coupler of the present invention, the output imbalance between channels is significantly improved, and the voltage difference between channel outputs is reduced to less than 1V.

[0040] It must be noted that the coupler proposed in this invention is mainly applicable to CWPT systems. The case study used a multi-channel CWPT system with parallel primary sides and series secondary sides. Those skilled in the art will readily understand that other multi-channel CWPT system topologies can also utilize the design method proposed in this invention, and all should be included within the scope of protection of this invention.

[0041] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A coupler for a multi-channel wireless power transfer system, characterized in that, include: Multiple channels are arranged side by side. Each channel includes a transmitter electrode group and a receiver electrode group. The transmitter electrode group includes a first electrode and a second electrode. The receiver electrode group includes a third electrode and a fourth electrode. The first electrode and the third electrode are coupled to each other. The second electrode and the fourth electrode are coupled to each other. Two shielding plates are provided. One shielding plate is located on the outer side of the transmitter electrode group away from the receiver electrode group, and the other shielding plate is located on the outer side of the receiver electrode group away from the transmitter electrode group. Each shielding plate includes an outer shielding plate, an inner shielding plate, and a side shielding plate connecting the outer shielding plate and the inner shielding plate. The outer shielding plate is located away from the channel relative to the inner shielding plate, and the area of ​​the outer shielding plate is larger than that of the inner shielding plate. The outer shielding plate is configured to cover the first, second, third, and fourth electrodes of all channels. The inner shielding plate is configured to cover the first and third electrodes of all channels, but not the second and fourth electrodes of all channels. The two relative permittivity are The fifth and sixth electrodes are located between the first electrode of all channels and the inner shield of a shielding plate, and the sixth electrode is located between the third electrode of all channels and the inner shield of another shielding plate. ≥2.

2. The multi-channel wireless power transfer system coupler as described in claim 1, characterized in that, The first, second, third, and fourth plates are four identical rectangular aluminum plates.

3. The multi-channel wireless power transfer system coupler as described in claim 1, characterized in that, The outer shielding plate is parallel to the inner shielding plate, and the side shielding plate is perpendicular to the outer shielding plate.

4. The multi-channel wireless power transfer system coupler as described in claim 3, characterized in that, The inner shielding plate is the same length as the outer shielding plate, and the width of the inner shielding plate is half the width of the outer shielding plate.

5. A multi-channel wireless power transfer system coupler as described in claim 1, characterized in that, One side of the fifth electrode plate is in contact with the first electrode plate of all channels, and the other side of the fifth electrode plate is in contact with the inner shielding plate of a shielding plate. One side of the sixth electrode plate is in contact with the third electrode plate of all channels, and the other side of the sixth electrode plate is in contact with the inner shielding plate of another shielding plate.

6. The multi-channel wireless power transfer system coupler as described in claim 1, characterized in that, The first, second, third, fourth, fifth, and sixth electrodes, as well as the outer and inner shielding plates, are all parallel.

7. A multi-channel wireless power transfer system coupler as described in claim 1, characterized in that, Both the fifth and sixth plates are glass plates.

8. The multi-channel wireless power transfer system coupler as described in claim 1, characterized in that, The dimensions of the fifth and sixth electrodes are the same as those of the inner shielding plate.

9. The equivalent circuit modeling method for a multi-channel wireless power transfer system coupler as described in any one of claims 1 to 8, characterized in that, An equivalent circuit model is established for the coupler of the multi-channel wireless power transfer system. The equivalent circuit model includes... n Each channel consists of a first plate, a second plate, a third plate, a fourth plate, a primary-side self-capacitance, a secondary-side self-capacitance, and mutual capacitance. The primary-side self-capacitance is connected in series between the first and second plates, the secondary-side self-capacitance is connected in series between the third and fourth plates, and the mutual capacitance is connected in series between the first and third plates. The second and fourth plates are electrically connected. A capacitor is connected between the first plates of any two channels, and a capacitor is connected between the third plates of any two channels.

10. The equivalent circuit modeling method for a coupler in a multi-channel wireless power transfer system as described in claim 9, characterized in that, The formula for calculating capacitance in the equivalent circuit model is: ； in, This represents the primary-side self-capacitance of the i-th channel. This represents the mutual capacitance of the i-th channel. This represents the secondary-side self-capacitance of the i-th channel. Indicates the transmission plate of the i-th channel. x With the j-th channel transmission plate y The capacitance between, superscript i , j Indicates the channel number, subscript x and y Indicates the electrode plate number. C i xy Indicates the first i One channel transmission plate x and transmission plates y Coupling capacitance between them C i xU Indicates the first i One channel transmission plate x and shielding plate P U Coupling capacitance between them C i xL Indicates the first i One channel transmission plate x and shielding plate P L Coupling capacitance between them Indicates the first j One channel transmission plate x and shielding plate P U Coupling capacitance between them Indicates the first i One channel transmission plate x and shielding plate P L Coupling capacitance between them C UL This represents the coupling capacitance between the upper and lower shielding plates.

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