A composite magnetic coupling mechanism capable of transmitting energy and signals in three paths

Abstract

The present application relates to wireless energy signal transmission technology field, specifically disclose a kind of energy and signal three-way composite magnetic coupling mechanism, including transmitting end and receiving end.Transmitting end includes by from bottom to top sequentially stacked first primary side coil 11, second primary side coil 12 and third primary side coil 13, receiving end includes by from top to bottom sequentially stacked first secondary side coil 21, second secondary side coil 22 and third secondary side coil 23.The present application will three-way magnetic coupling coil be embedded into a tool, saves the installation area of wireless power transmission equipment;Coupling mechanism link adds wireless signal transmission function redundancy function, when one-way signal transmission path fails, another can work normally, ensure uninterrupted information interaction;Wireless power, wireless signal transmission and do not interfere with each other;3-way channel can work simultaneously.

Description

Technical Field

[0001] This invention relates to the field of wireless power and signal simultaneous transmission technology, and in particular to a composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths. Background Technology

[0002] Highly integrated wireless devices require simultaneous power transmission and information exchange. For example, in the scheme "A Simultaneous Energy and Signal Transmission Structure and Dynamic Wireless Energy Transmission System" shown in application number CN202011327325.2, different coils are used for energy transmission and signal transmission, and the energy coils and signal coils on each side are decoupled from each other, thus ensuring that energy transmission and signal transmission do not interfere with each other. Another example is the scheme "Full-Duplex WPT Parallel Energy and Signal Transmission System Based on Dual-Side LCC" shown in application number CN202010895860.1, where energy and signal share a set of coils, and a wave-blocking network is added to ensure that energy transmission and signal transmission do not interfere with each other.

[0003] To ensure signal transmission has a certain degree of resilience, wireless signal transmission is often required to have emergency backup capabilities, meaning that the information exchange system can continue to operate even if one signal transmission path fails. However, current technology can only achieve simultaneous transmission of both energy and signal. Summary of the Invention

[0004] This invention provides a composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths, and solves the technical problem of how to achieve simultaneous transmission of energy and signal in three paths.

[0005] To solve the above technical problems, the present invention provides a composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths, including a transmitter and a receiver; the transmitter includes a primary-side first coil, a primary-side second coil, and a primary-side third coil stacked in any order, and the receiver includes a secondary-side first coil, a secondary-side second coil, and a secondary-side third coil stacked in any order; the primary-side first coil and the secondary-side first coil form a first coupling channel, the primary-side second coil and the secondary-side second coil form a second coupling channel, and the primary-side third coil and the secondary-side third coil form a third coupling channel;

[0006] The primary side first coil, the secondary side first coil, the primary side second coil, and the secondary side second coil are all figure-eight coils of the same specifications. The figure-eight coils are wound in a figure-eight winding manner. The primary side first coil and the secondary side first coil are placed in the same position, and the primary side second coil and the secondary side second coil are placed in the same position. The primary side first coil and the primary side second coil are placed orthogonally to each other.

[0007] The primary side third coil and the secondary side third coil are rectangular coils that match the size of the figure-eight coil;

[0008] One or two of the first coupling channel, the second coupling channel, and the third coupling channel are used as signal transmission channels, and the rest are used as energy transmission channels; the three transmission channels can work simultaneously or not at the same time, and the lines do not interfere with each other.

[0009] Preferably, the first coupling channel serves as an energy transmission channel, the second coupling channel serves as a first signal transmission channel, and the third coupling channel serves as a second signal transmission channel.

[0010] Preferably, the second coupling channel serves as an energy transmission channel, the first coupling channel serves as a first signal transmission channel, and the third coupling channel serves as a second signal transmission channel.

[0011] Preferably, the third coupling channel serves as an energy transmission channel, the first coupling channel serves as a first signal transmission channel, and the second coupling channel serves as a second signal transmission channel.

[0012] Preferably, the primary side first coil, the primary side second coil, and the primary side third coil are stacked sequentially from bottom to top, and the secondary side first coil, the secondary side second coil, and the secondary side third coil are stacked sequentially from top to bottom.

[0013] Preferably, the primary side first coil, the primary side third coil, and the primary side second coil are stacked sequentially from bottom to top, and the secondary side first coil, the secondary side third coil, and the secondary side second coil are stacked sequentially from top to bottom.

[0014] Preferably, the primary side second coil, the primary side first coil, and the primary side third coil are stacked sequentially from bottom to top, and the secondary side second coil, the secondary side first coil, and the secondary side third coil are stacked sequentially from top to bottom.

[0015] Preferably, the primary side second coil, the primary side third coil, and the primary side first coil are stacked sequentially from bottom to top, and the secondary side second coil, the secondary side third coil, and the secondary side first coil are stacked sequentially from top to bottom.

[0016] Preferably, the primary-side third coil, the primary-side second coil, and the primary-side first coil are stacked sequentially from bottom to top, and the secondary-side third coil, the secondary-side second coil, and the secondary-side first coil are stacked sequentially from top to bottom.

[0017] Preferably, the primary-side third coil, the primary-side first coil, and the primary-side second coil are stacked sequentially from bottom to top, and the secondary-side third coil, the secondary-side first coil, and the secondary-side second coil are stacked sequentially from top to bottom.

[0018] This invention provides a composite magnetic coupling mechanism for simultaneous four-way transmission of energy and signals. It establishes three transmission channels and, through the design of the transceiver coils, decouples the transmitting coils at the transmitting end and the receiving coils at the receiving end, ensuring that the transmission between the three channels does not interfere with each other. This allows the information exchange system to continue operating even if one signal transmission path fails during energy transmission. Invention:

[0019] 1) Embedding the three magnetic coupling coils into a single fixture saves installation space for wireless power transmission equipment;

[0020] 2) A wireless signal transmission redundancy function has been added to the coupling mechanism. If one signal transmission path fails, the other path can still work normally, ensuring uninterrupted information exchange.

[0021] 3) Wireless power and wireless signals are transmitted simultaneously without interference;

[0022] 4) All three channels can operate simultaneously. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the stacking relationship of a composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths, provided in an embodiment of the present invention.

[0024] Figure 2 This is a diagram showing the positional arrangement of the primary-side first coil and the secondary-side first coil provided in an embodiment of the present invention.

[0025] Figure 3 This is a diagram showing the positional arrangement of the primary-side second coil and the secondary-side second coil provided in an embodiment of the present invention;

[0026] Figure 4 This is a diagram showing the positional arrangement of the primary-side third coil and the secondary-side third coil provided in an embodiment of the present invention.

[0027] Figure 5 This is a diagram showing the magnetic field interference between the energy transmitting coil and the first signal transmitting coil, provided in an embodiment of the present invention.

[0028] Figure 6 This is a diagram showing the magnetic field interference between the energy transmitting coil and the second signal transmitting coil, provided in an embodiment of the present invention.

[0029] Figure 7This is a diagram showing the magnetic field interference between the first signal transmitting coil and the energy transmitting coil, provided in an embodiment of the present invention.

[0030] Figure 8 This is a diagram showing the magnetic field interference between the first signal transmitting coil and the second signal transmitting coil, provided in an embodiment of the present invention.

[0031] Figure 9 This is a diagram showing the magnetic field interference between the second signal transmitting coil and the energy transmitting coil, provided in an embodiment of the present invention.

[0032] Figure 10 This is a diagram showing the magnetic field interference between the second signal transmitting coil and the first signal transmitting coil, provided in an embodiment of the present invention.

[0033] Figure reference numerals: Primary side first coil 11, primary side second coil 12, primary side third coil 13, secondary side first coil 21, secondary side second coil 22, secondary side third coil 23. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The embodiments are given for illustrative purposes only and should not be construed as limiting the present invention. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0035] Example 1

[0036] This invention provides a composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths, including a transmitter and a receiver. For example... Figure 1 As shown, the transmitting end includes a primary-side first coil 11, a primary-side second coil 12, and a primary-side third coil 13 stacked sequentially from bottom to top. The receiving end includes a secondary-side first coil 21, a secondary-side second coil 22, and a secondary-side third coil 23 stacked sequentially from top to bottom. The primary-side first coil 11 and the secondary-side first coil 21 form a first coupling channel; the primary-side second coil 12 and the secondary-side second coil 22 form a second coupling channel; and the primary-side third coil 13 and the secondary-side third coil 23 form a third coupling channel.

[0037] The primary side first coil 11, the secondary side first coil 21, the primary side second coil 12, and the secondary side second coil 22 are all figure-eight coils of the same specifications. The figure-eight coils are wound in a figure-eight winding pattern. The primary side first coil 11 and the secondary side first coil 21 are placed in the same position, and the primary side second coil 12 and the secondary side second coil 22 are placed in the same position. The primary side first coil 11 and the primary side second coil 12 are placed in mutually orthogonal positions. Figure 2The diagram shows the placement of the primary side first coil 11 and the secondary side first coil 21. Figure 3 The diagram shows the placement of the primary side second coil 12 and the secondary side second coil 22. As you can see, their placement is orthogonal (crossing at 90°), which is to achieve decoupling. The following text details how decoupling is achieved.

[0038] like Figure 4 As shown, the primary side third coil 13 and the secondary side third coil 23 are rectangular coils that match the size of the figure-eight coil.

[0039] Figure 2 , Figure 3 , Figure 4 The arrow in the image indicates the direction of travel.

[0040] To achieve good decoupling, all coil frames are set as squares of the same size and stacked together in an overlapping manner.

[0041] In practical applications, one or two of the first, second, and third coupling channels are used as signal transmission channels, while the rest are used as energy transmission channels; the three transmission channels can work simultaneously or not at the same time, and the lines do not interfere with each other.

[0042] This example illustrates the principle of decoupling the three coupling channels by using the first coupling channel as the energy transmission channel, the second coupling channel as the first signal transmission channel, and the third coupling channel as the second signal transmission channel.

[0043] Apply alternating current I to the transmitter P When an alternating magnetic field is generated, according to Lenz's law, when the total magnetic field strength is not zero, the closed coil (receiving coil) will generate an induced electromotive force U. According to equation (1), when the resonant angular frequency ω and the transmitting end current IP are fixed, the induced electromotive force is proportional to the mutual inductance M. The mutual inductance M is determined by the characteristics of the two energy coils. When the relative angle of the two energy coils is fixed and the center distance is unchanged, the value of mutual inductance M remains unchanged, that is, the induced electromotive force remains unchanged, and stable energy can be picked up at any angle.

[0044] U=jωMI p (1)

[0045] First, let's analyze the application of alternating current I to the energy transmitting coil. P1 The other five coils are all affected by the energy transmitting coil. Since the winding method of each group of transmitting coils is the same as that of receiving coils, we can analyze the influence of the energy transmitting coil on the first signal transmitting coil and the second signal transmitting coil by analogy.

[0046] like Figure 5As shown, the energy transmitting coil and the first signal transmitting coil are superimposed at a 90° angle (orthogonal), and both are wound in a figure-eight shape. Taking the energy transmitting coil as an example, an alternating current I is applied to the energy transmitting coil. P1 At this time, the left and right parts generate an alternating magnetic field of consistent intensity but opposite direction. Influenced by the magnetic field of the energy transmitting coil, the upper half of the first signal transmitting coil receives magnetic fields of different directions but consistent intensity. Overall, the magnetic field strength in the upper half of the first signal transmitting coil is 0. Similarly, the alternating magnetic field strength of the energy transmitting coil in the lower half of the first signal transmitting coil is also 0. The sum of the two is still 0, which means that the mutual inductance M is 0 and the induced electromotive force is 0. This indicates that the interference of the energy coil on the first signal transmitting coil is 0. Similarly, the analysis at the receiving end is similar; the interference of the energy transmitting coil on the first signal receiving coil is also 0.

[0047] Similarly, an alternating current I is applied to the energy transmitting coil. P1 At that time, the magnetic field interference experienced by the second signal transmitting coil is as follows: Figure 6 As shown, the second signal coil is affected by two magnetic fields of equal strength but opposite direction generated by the energy transmitting coil. The combined magnetic field strength is 0, which is reflected in the mutual inductance M being 0 and the induced electromotive force U being 0. Similarly, the situation at the receiving end is similar, and the interference of the energy transmitting coil on the second signal receiving coil is also 0.

[0048] In summary, the energy transmitting coil does not interfere with the second signal coil (transmitting coil and receiving coil). In practical applications, when the energy coil transmits energy, the modulation and demodulation circuit connected to the second signal coil will not receive meaningless interference signals, ensuring the accuracy of information exchange.

[0049] Similarly, taking the first signal transmitting coil as an example, such as Figure 7 As shown, an alternating current I is applied to the first signal transmitting coil. P2 At this time, an alternating magnetic field of consistent intensity but opposite direction is generated in the upper and lower parts. Influenced by the magnetic field of the first signal coil, the left half of the energy transmitting coil receives magnetic fields of different directions but consistent intensity. Overall, the magnetic field strength in the left half of the energy transmitting coil is 0. Similarly, the alternating magnetic field strength of the first signal transmitting coil in the right half of the energy transmitting coil is 0. The sum of the two is still 0, which means that the mutual inductance M is 0 and the induced electromotive force is 0. This indicates that the interference of the first signal coil on the energy transmitting coil is 0. Similarly, the analysis at the receiving end is similar, and the interference of the first signal transmitting coil on the energy receiving coil is also 0.

[0050] In summary, the first signal transmitting coil does not interfere with the energy coils (transmitting and receiving coils). In practical applications, when the first signal coil transmits a signal, the inverter circuit components connected to the energy transmitting coil will not be damaged, and the rectifier circuit connected to the energy receiving coil will not start and thus falsely trigger subsequent circuits.

[0051] Similarly, an alternating current I is applied to the first signal transmitting coil. P2 At that time, the magnetic field interference experienced by the second signal transmitting coil is as follows: Figure 8 As shown, the second signal transmitting coil is affected by two magnetic fields of equal strength but opposite direction generated by the first signal transmitting coil. The combined magnetic field strength is 0, which is reflected in the mutual inductance M being 0 and the induced electromotive force U being 0. Similarly, the situation at the receiving end is similar, and the interference of the first signal transmitting coil to the second signal receiving coil is also 0.

[0052] In summary, the first signal transmitting coil does not interfere with the second signal coil (transmitting coil and receiving coil). In practical applications, when the first signal coil transmits a signal, the modulation and demodulation circuit connected to the second signal coil will not receive any meaningless interference signals, ensuring the accuracy of information exchange.

[0053] Figure 9 In the middle, an alternating current I is applied to the second signal transmitting coil. P3 At that time, the energy transmitting coil is affected by the magnetic field of the second signal coil. According to Lenz's law, the left half of the energy transmitting coil generates an upward magnetic field, which in turn generates a counterclockwise current I. 3-1 Similarly, the right half of the energy transmitting coil generates an upward magnetic field, which in turn generates a counterclockwise current I. 3-2 The two induced currents are equal in magnitude. Since the energy transmitting coil is wound in opposite directions, I3-1 and I3-2 are in opposite directions when viewed along the winding direction of the energy transmitting coil, meaning the total induced electromotive force is 0. Therefore, it can be considered that the interference voltage of the second signal transmitting coil to the energy transmitting coil is 0. Similarly, the analysis at the receiving end is similar; the interference of the second signal transmitting coil to the energy receiving coil is also 0.

[0054] In summary, the second signal transmitting coil does not interfere with the energy coils (transmitting and receiving coils). In practical applications, when the second signal coil transmits a signal, the inverter circuit components connected to the energy transmitting coil will not be damaged, and the rectifier circuit connected to the energy receiving coil will not start and thus falsely trigger subsequent circuits.

[0055] Figure 10 In the middle, an alternating current I is applied to the second signal transmitting coil. P3At that time, the first signal transmitting coil is affected by the magnetic field of the second signal transmitting coil. According to Lenz's law, the upper part of the first signal transmitting coil generates an upward magnetic field, which in turn generates a counterclockwise current I. 3-3 Similarly, the lower half of the first signal transmitting coil generates an upward magnetic field, which in turn generates a counterclockwise current I. 3-4 The two induced currents are equal in magnitude. Since the first signal transmitting coil is wound in reverse, looking along the winding direction of the first signal transmitting coil, I... 3-3 with I 3-4 Since the directions are opposite, the total induced electromotive force is 0. Therefore, it can be considered that the interference voltage of the second signal transmitting coil to the first signal transmitting coil is 0. Similarly, the analysis at the receiving end is similar; the interference of the second signal transmitting coil to the first signal receiving coil is also 0.

[0056] In summary, the second signal transmitting coil does not interfere with the first signal coil (transmitting coil and receiving coil). In practical applications, when the second signal coil transmits a signal, the modulation and demodulation circuit connected to the first signal coil will not receive any meaningless interference signals, ensuring the accuracy of information exchange.

[0057] In summary, the composite magnetic coupling mechanism for simultaneous energy and signal transmission proposed in this paper can achieve the following: when any one pair of coils is working, it does not affect the other two pairs of coils; it has the function of simultaneous energy and signal transmission; it has a signal transmission redundancy design, that is, when one signal transmission channel fails, the other signal transmission channel can work normally without being affected; and all three channels can work simultaneously.

[0058] It should also be noted that this example uses one of the three channels for energy transmission and the other two for information transmission. In other implementations, two channels can be used for energy transmission and one for information transmission, depending on the specific requirements. During information transmission, the signal coil at the transmitting end can function as either a signal transmitting coil or a signal receiving coil, depending on the specific application requirements.

[0059] Example 2

[0060] The difference between this embodiment and Embodiment 1 is that:

[0061] The primary side first coil 11, the primary side third coil 13 and the primary side second coil 12 are stacked in order from bottom to top, and the secondary side first coil 21, the secondary side third coil 23 and the secondary side second coil 22 are stacked in order from top to bottom.

[0062] In this embodiment, similar to Embodiment 1, one channel is used for energy transmission, and the other two channels are used for information transmission. The channels do not interfere with each other.

[0063] Example 3

[0064] The difference between this embodiment and Embodiment 1 is that:

[0065] The primary side second coil 12, primary side first coil 11 and primary side third coil 13 are stacked in order from bottom to top, and the secondary side second coil 22, secondary side first coil 21 and secondary side third coil 23 are stacked in order from top to bottom.

[0066] In this embodiment, similar to Embodiment 1, one channel is used for energy transmission, and the other two channels are used for information transmission. The channels do not interfere with each other.

[0067] Example 4

[0068] The difference between this embodiment and Embodiment 1 is that:

[0069] The primary side second coil 12, primary side third coil 13 and primary side first coil 11 are stacked in order from bottom to top, and the secondary side second coil 22, secondary side third coil 23 and secondary side first coil 21 are stacked in order from top to bottom.

[0070] In this embodiment, similar to Embodiment 1, one channel is used for energy transmission, and the other two channels are used for information transmission. The channels do not interfere with each other.

[0071] Example 5

[0072] The difference between this embodiment and Embodiment 1 is that:

[0073] The primary side third coil 13, the primary side second coil 12 and the primary side first coil 11 are stacked in order from bottom to top, and the secondary side third coil 23, the secondary side second coil 22 and the secondary side first coil 21 are stacked in order from top to bottom.

[0074] In this embodiment, similar to Embodiment 1, one channel is used for energy transmission, and the other two channels are used for information transmission. The channels do not interfere with each other.

[0075] Example 6

[0076] The difference between this embodiment and Embodiment 1 is that:

[0077] The primary side third coil 13, the primary side first coil 11, and the primary side second coil 12 are stacked in order from bottom to top, while the secondary side third coil 23, the secondary side first coil 21, and the secondary side second coil 22 are stacked in order from top to bottom.

[0078] In this embodiment, similar to Embodiment 1, one channel is used for energy transmission, and the other two channels are used for information transmission. The channels do not interfere with each other.

[0079] The above embodiments only illustrate the case where the coils of the transmitter and receiver are stacked symmetrically. However, the stacking order of the coils can be set arbitrarily for both the transmitter and receiver.

[0080] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths, characterized in that, It includes a transmitter and a receiver; the transmitter includes a primary side first coil (11), a primary side second coil (12) and a primary side third coil (13) stacked in any order; the receiver includes a secondary side first coil (21), a secondary side second coil (22) and a secondary side third coil (23) stacked in any order; the primary side first coil (11) and the secondary side first coil (21) form a first coupling channel; the primary side second coil (12) and the secondary side second coil (22) form a second coupling channel; the primary side third coil (13) and the secondary side third coil (23) form a third coupling channel. The primary side first coil (11), the secondary side first coil (21), the primary side second coil (12), and the secondary side second coil (22) are all figure-eight coils of the same specifications. The figure-eight coils are wound in a figure-eight winding manner. The primary side first coil (11) and the secondary side first coil (21) are placed in the same position. The primary side second coil (12) and the secondary side second coil (22) are placed in the same position. The primary side first coil (11) and the primary side second coil (12) are placed in mutually orthogonal positions. The primary side third coil (13) and the secondary side third coil (23) are rectangular coils that match the size of the figure-eight coil; One or two of the first coupling channel, the second coupling channel, and the third coupling channel are used as signal transmission channels, and the rest are used as energy transmission channels. The three transmission channels can operate simultaneously or at different times without interfering with each other.

2. The composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to claim 1, characterized in that: The first coupling channel serves as an energy transmission channel, the second coupling channel serves as a first signal transmission channel, and the third coupling channel serves as a second signal transmission channel.

3. The composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to claim 1, characterized in that: The second coupling channel serves as an energy transmission channel, the first coupling channel serves as a first signal transmission channel, and the third coupling channel serves as a second signal transmission channel.

4. The composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to claim 1, characterized in that: The third coupling channel serves as an energy transmission channel, the first coupling channel serves as a first signal transmission channel, and the second coupling channel serves as a second signal transmission channel.

5. A composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to any one of claims 2 to 4, characterized in that: The primary side first coil (11), the primary side second coil (12), and the primary side third coil (13) are stacked sequentially from bottom to top, and the secondary side first coil (21), the secondary side second coil (22), and the secondary side third coil (23) are stacked sequentially from top to bottom.

6. A composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to any one of claims 2 to 4, characterized in that: The primary side first coil (11), the primary side third coil (13), and the primary side second coil (12) are stacked sequentially from bottom to top, and the secondary side first coil (21), the secondary side third coil (23), and the secondary side second coil (22) are stacked sequentially from top to bottom.

7. A composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to any one of claims 2 to 4, characterized in that: The primary side second coil (12), the primary side first coil (11), and the primary side third coil (13) are stacked sequentially from bottom to top, and the secondary side second coil (22), the secondary side first coil (21), and the secondary side third coil (23) are stacked sequentially from top to bottom.

8. A composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to any one of claims 2 to 4, characterized in that: The primary side second coil (12), the primary side third coil (13), and the primary side first coil (11) are stacked sequentially from bottom to top, and the secondary side second coil (22), the secondary side third coil (23), and the secondary side first coil (21) are stacked sequentially from top to bottom.

9. A composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to any one of claims 2 to 4, characterized in that: The primary side third coil (13), the primary side second coil (12), and the primary side first coil (11) are stacked sequentially from bottom to top, while the secondary side third coil (23), the secondary side second coil (22), and the secondary side first coil (21) are stacked sequentially from top to bottom.

10. A composite magnetic coupling mechanism for simultaneous transmission of energy and signal in three paths according to any one of claims 2 to 4, characterized in that: The primary side third coil (13), the primary side first coil (11), and the primary side second coil (12) are stacked sequentially from bottom to top, and the secondary side third coil (23), the secondary side first coil (21), and the secondary side second coil (22) are stacked sequentially from top to bottom.

Images