Quick-charging energy transmission structure

Abstract

The invention relates to a fast-charging energy transmission structure. According to the fast-charging energy transmission structure, a low-frequency MOS tube is adopted to build a full-bridge switching circuit, the two ends of a transmitting coil are electrically connected with common-mode inductors, the two ends of the transmitting coil are electrically connected with capacitance filters, and a radiation shielding mechanism is arranged on the transmitting surface side of the transmitting coil. The fast charging electric energy transmission structure adopting the low-frequency MOS tube not only can inhibit conducted interference, but also can prevent radiation interference, so that on the basis that the fast charging electric energy transmission structure can meet the working frequency requirement of a charging standard Qi2 and meet the EMC requirement, the circuit setting cost is greatly reduced, and the fast charging experience requirement of a user is met.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging, and in particular to a fast charging energy transmission structure. Background Art

[0002] Wireless charging technology is a technology that uses electromagnetic fields to transmit energy. This technology allows electronic devices to be charged at a distance of several centimeters or even farther without physical connection. Because it has no cable connection, it avoids the entanglement and clutter of charging cables, making the design more concise and improving the aesthetics of home and office environments; because it does not require plugging and unplugging wires, it can reduce the risk of cable wear and damage and improve charging safety; it can be seen that it has the advantages of convenience, flexibility, durability, safety and aesthetics. This technology has been widely used in consumer electronics, medical equipment, electric vehicles, household goods and other fields, especially in smartphones, smart watches, headphones and other products in the consumer electronics field.

[0003] In 2023, the Wireless Charging Alliance launched an updated wireless charging standard Qi2, which requires the operating frequency of wireless chargers to be 360KHz; in order to meet the operating frequency of wireless chargers, ensure power conversion efficiency and reduce electromagnetic interference, the switching frequency of the MOS tube in the charging circuit needs to match the operating frequency of the wireless charger. Taking wireless charging of watches as an example, to achieve a fast charging power of 5W, the switching frequency of the MOS tube used must reach 1.78MHz to meet the operating frequency requirements and not cause EMC problems. EMC (Electromagnetic Compatibility) refers to the ability of electronic equipment to work normally in an electromagnetic environment without interfering with other surrounding equipment, and at the same time not being interfered with by the surrounding electromagnetic environment.

[0004] However, the switching frequency of conventional MOS tubes is less than 1MHz. If the wireless charger using this MOS tube outputs 5W power, the switching speed of the MOS tube cannot keep up, and its parasitic capacitance causes additional charging and discharging currents during the switching process. When the frequency of this part of the charging and discharging current forms a specific proportional relationship with the frequency of the alternating current, high-frequency harmonics are generated, and high-frequency harmonics cause parasitic magnetic fields in the alternating magnetic field, resulting in increased coil radiation and failure to meet the national safety regulations for EMC. To avoid EMC problems, wireless chargers using this MOS tube can only reduce the charging power to meet the operating frequency requirements with an output power of 2.5W, resulting in a poor wireless charging experience. If a wireless charger using a MOS tube with a switching frequency higher than 1.78MHz is used, the cost is relatively high. For example, the cost of a gallium nitride MOS tube is several times that of a conventional MOS tube.

[0005] It can be seen that on the basis of meeting the operating frequency requirements of the wireless charging standard Qi2 and complying with the EMC requirements, the existing technology cannot simultaneously achieve both cost reduction and improvement of the user's charging experience. Summary of the invention

[0006] Based on this, the object of the present invention is to provide a fast charging energy transmission structure.

[0007] A fast charging energy transmission structure, comprising:

[0008] A circuit board, on which a transmitting circuit is arranged, wherein the transmitting circuit comprises a DC power input terminal electrically connected to a power supply terminal of the circuit board, a full-bridge switch circuit electrically connected to the DC power input terminal, and an electromagnetic compatibility module electrically connected to the full-bridge switch circuit;

[0009] a transmitting coil, electrically connected to the electromagnetic compatibility module, and the transmitting coil is electrically connected to the full-bridge switch circuit through the electromagnetic compatibility module;

[0010] A radiation shielding mechanism connected to the ground terminal is installed on the emitting surface side of the transmitting coil.

[0011] Further, the full-bridge switch circuit includes a first half-bridge and a second half-bridge, and the first half-bridge and the second half-bridge are electrically connected to the DC power supply input terminal;

[0012] The electromagnetic compatibility module includes common mode inductor and capacitor filters;

[0013] The common-mode inductor includes a first coil and a second coil, one end of the transmitting coil is electrically connected to the first half-bridge through the first coil, and the other end of the transmitting coil is electrically connected to the second half-bridge through the second coil;

[0014] The capacitive filter includes a first filter capacitor and a second filter capacitor. The two ends of the transmitting coil are electrically connected to one end of the first filter capacitor and one end of the second filter capacitor respectively. The other end of the first filter capacitor and the other end of the second filter capacitor are both grounded.

[0015] Further, the first half-bridge includes a first low-frequency MOS transistor and a second low-frequency MOS transistor, the second half-bridge includes a third low-frequency MOS transistor and a fourth low-frequency MOS transistor, and the first low-frequency MOS transistor, the second low-frequency MOS transistor, the third low-frequency MOS transistor and the fourth low-frequency MOS transistor are N-type MOS transistors;

[0016] One end of the first coil is electrically connected to the source of the first low-frequency MOS transistor and the drain of the second low-frequency MOS transistor, and the other end of the first coil is electrically connected to one end of the transmitting coil; one end of the second coil is electrically connected to the source of the third low-frequency MOS transistor and the drain of the fourth low-frequency MOS transistor, and the other end of the second coil is electrically connected to the other end of the transmitting coil.

[0017] Furthermore, the DC power supply input terminal includes a positive terminal and a negative terminal, the negative terminal is connected to the ground terminal, the drain of the first low-frequency MOS tube and the drain of the third low-frequency MOS tube are electrically connected to the positive terminal, and the source of the second low-frequency MOS tube and the source of the fourth low-frequency MOS tube are electrically connected to the negative terminal.

[0018] Furthermore, a switching frequency of the first low-frequency MOS transistor, the second low-frequency MOS transistor, the third low-frequency MOS transistor and the fourth low-frequency MOS transistor is less than or equal to 1 MHz.

[0019] Furthermore, the transmitting circuit also includes a resonant capacitor, one end of the second coil is electrically connected to one end of the resonant capacitor, and the other end of the resonant capacitor is electrically connected to the source of the third low-frequency MOS tube and the drain of the fourth low-frequency MOS tube.

[0020] Furthermore, the first coil and the second coil are symmetrically wound on a ring-shaped magnetic core.

[0021] Furthermore, the radiation shielding mechanism includes a connecting portion and an absorbing portion; one end of the connecting portion is connected to the ground end, and the other end of the connecting portion is connected to the absorbing portion; the area of ​​the absorbing portion can cover the transmitting surface of the transmitting coil.

[0022] Furthermore, the absorption part includes a plurality of absorption strips which are parallel to each other and arranged at intervals, and one end of each of the absorption strips is connected to the connection part.

[0023] Furthermore, the absorption strips are parallel straight line segments, or arc-shaped line segments, or wavy line segments.

[0024] Compared with the prior art, the fast charging energy transmission structure described in the present invention: by using low-frequency MOS tubes to build a full-bridge switching circuit, and electrically connecting an electromagnetic compatibility module composed of a common-mode inductor and a capacitor filter at both ends of the transmitting coil, and providing a radiation shielding mechanism on the transmitting surface side of the transmitting coil, the fast charging energy transmission structure using low-frequency MOS tubes can not only suppress conducted interference but also prevent radiation interference, so that the fast charging energy transmission structure can meet the operating frequency requirements of the charging standard Qi2 and comply with EMC requirements, greatly reduce the circuit setting cost, and meet the user's fast charging experience requirements.

[0025] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a fast charging wireless charging device according to an embodiment;

[0027] Figure 2 A circuit diagram of a fast charging energy transmission structure according to an embodiment;

[0028] Figure 3 A schematic diagram of the relative positions of a transmitting coil and a radiation shielding mechanism according to an embodiment;

[0029] Figure 4 is a schematic structural diagram of a radiation shielding mechanism according to an embodiment;

[0030] Figure 5 This is a frequency-electric field strength test result diagram without using the fast charging energy transmission structure of the present invention;

[0031] Figure 6 This is a frequency-electric field strength test result diagram of the fast charging energy transmission structure of the present invention. DETAILED DESCRIPTION

[0032] In order to solve the contradiction that the prior art cannot reduce costs and improve the user's wireless charging experience on the basis of simultaneously meeting the operating frequency requirements of the charging standard Qi2 and complying with the EMC requirements, after research and design, the present invention proposes a fast charging wireless charging device, which includes a fast charging energy transmission structure. The fast charging energy transmission structure adopts four low-frequency MOS tubes to form a full-bridge switching circuit, and a common-mode inductor and a grounding capacitor filter are respectively connected at both ends of the transmitting coil, and a radiation shielding mechanism is provided on the transmitting surface side of the transmitting coil, so as to solve the problem that the prior art cannot simultaneously reduce costs and improve the user's charging experience.

[0033] See also Figure 1 The fast charging wireless charging device of the present invention comprises a housing, and a fast charging energy transmission structure 1, a signal module 2 and a control module 3 arranged in the housing. The fast charging energy transmission structure 1 performs electromagnetic conversion and provides an alternating magnetic field; the signal module 2 uses ASK modulation technology to realize communication between the fast charging wireless charging device and the device to be charged; the control module 3 is used to control the driving of the fast charging energy transmission structure 1 according to the information transmitted by the signal module 2.

[0034] See also Figure 2The fast charging energy transmitting structure 1 of the present invention comprises a circuit board (not shown), a transmitting circuit 10 arranged on the circuit board, a transmitting coil 20 electrically connected to the transmitting circuit 10, and a radiation shielding mechanism 30 connected to the ground terminal. The transmitting coil 20 is provided with a transmitting surface, and the radiation shielding mechanism 30 is installed on the transmitting surface of the transmitting coil 20. The transmitting surface of the present invention is the surface of the transmitting coil 20 facing the receiving surface of the receiving coil of the device to be charged, and the transmitting surface is in the charging area.

[0035] The transmitting circuit 10 includes a DC power input terminal 11 electrically connected to the power supply terminal of the circuit board, a full-bridge switch circuit 12, an electromagnetic compatibility module 13 and a resonant capacitor 14. The full-bridge switch circuit 12 receives an external DC voltage signal through the DC power input terminal 11, and controls the conduction and cutoff of the low-frequency switch according to the drive signal to output an alternating voltage signal of a specific frequency to drive the transmitting coil 20 to work at the resonant frequency, so that the inductor coil generates an alternating magnetic field to achieve wireless energy transmission; the electromagnetic compatibility module 13 is used to reduce the radiation interference of the fast charging energy transmitting structure 1 to EMC. Specifically, the electromagnetic compatibility module 13 includes a common-mode inductor 131 and a capacitor filter 132. The common-mode inductor 131 suppresses the high-frequency harmonic voltage or high-frequency harmonic current generated by the full-bridge switch circuit 12 from being input to the transmitting coil 20, and the capacitor filter 132 filters the common-mode noise. The electromagnetic compatibility module 13 suppresses the conducted interference of high-frequency harmonics through the common-mode inductor 131 and the capacitor filter 132 set therein, thereby reducing the radiation interference to EMC. One end of the resonant capacitor 14 is electrically connected to the electromagnetic compatibility module 13 , and the other end of the resonant capacitor 14 is electrically connected to the full-bridge switch circuit 12 to adjust the resonant frequency of the circuit.

[0036] The DC power input terminal 11 provides electrical energy for the entire fast charging energy transmission structure 1, and includes a positive terminal 112 and a negative terminal 114. The positive terminal 112 represents the positive pole of the DC power supply, which is used to be electrically connected to the positive pole of the circuit board power supply terminal, and the negative terminal 114 represents the negative pole of the DC power supply, which is used to be electrically connected to the negative pole of the circuit board power supply terminal.

[0037] The full-bridge switch circuit 12 includes four low-frequency MOS transistors, namely a first low-frequency MOS transistor 121, a second low-frequency MOS transistor 122, a third low-frequency MOS transistor 123 and a fourth low-frequency MOS transistor 124. The four low-frequency MOS transistors are connected in the form of a full bridge and are alternately turned on and off to generate a high-frequency pulse width modulation signal.

[0038] In this embodiment, the first low-frequency MOS transistor 121 and the second low-frequency MOS transistor 122 are electrically connected to form a first half-bridge; the third low-frequency MOS transistor 123 and the fourth low-frequency MOS transistor are electrically connected to form a second half-bridge. The first low-frequency MOS transistor 121, the second low-frequency MOS transistor 122, the third low-frequency MOS transistor 123 and the fourth low-frequency MOS transistor 124 are N-type MOS transistors, and preferably N-type MOS transistors with a switching frequency less than or equal to 1 MHz.

[0039] Specifically, the electrical connection relationship of the first half bridge is as follows:

[0040] The drain of the first low-frequency MOS transistor 121 is electrically connected to the positive terminal 112, the source thereof is electrically connected to the drain of the second low-frequency MOS transistor 122, and the gate thereof is electrically connected to the drain; the source of the second low-frequency MOS transistor 122 is electrically connected to the negative terminal 114, and the gate thereof is electrically connected to the drain.

[0041] The electrical connection relationship of the second half bridge is as follows:

[0042] The drain of the third low-frequency MOS transistor 123 is electrically connected to the positive terminal 112, the source thereof is electrically connected to the drain of the fourth low-frequency MOS transistor 124, and the gate thereof is electrically connected to the drain thereof; the source of the fourth low-frequency MOS transistor 124 is electrically connected to the negative terminal 114, and the gate thereof is electrically connected to the drain thereof.

[0043] The electromagnetic compatibility module 13 includes a common mode inductor 131 and a capacitor filter 132 .

[0044] The common mode inductor 131 includes a first coil 1311 and a second coil 1312. The first coil 1311 and the second coil 1312 are symmetrically wound on a toroidal magnetic core. The symmetrically wound coils can enhance the suppression of common mode current and reduce the impact on differential mode signals.

[0045] In a specific implementation, any one coil is connected between the transmitting coil 20 and the resonant capacitor 14 , and the corresponding other coil is connected between the transmitting coil 20 and the full-bridge switch circuit 12 .

[0046] In one embodiment, the electrical connection relationship between the first coil 1311 and the second coil 1312 and the full-bridge switch circuit 12, the transmitting coil 20, and the resonant capacitor 14 is as follows:

[0047] One end of the first coil 1311 is electrically connected to the source of the first low-frequency MOS transistor 121 and the drain of the second low-frequency MOS transistor 122, and the other end of the first coil 1311 is electrically connected to one end of the transmitting coil 20; one end of the second coil 1312 is electrically connected to the other end of the transmitting coil 20, and the other end of the second coil 1312 is electrically connected to the resonant capacitor 14, and is indirectly electrically connected to the source of the third low-frequency MOS transistor 123 and the drain of the fourth low-frequency MOS transistor 124 through the resonant capacitor 14.

[0048] In another embodiment, the electrical connection relationship between the first coil 1311 and the second coil 1312 and the full-bridge switch circuit 12, the transmitting coil 20, and the resonant capacitor 14 is as follows:

[0049] One end of the first coil 1311 is electrically connected to the resonant capacitor 14, and is indirectly electrically connected to the source of the first low-frequency MOS transistor 121 and the drain of the second low-frequency MOS transistor 122 through the resonant capacitor 14, and the other end of the first coil 1311 is electrically connected to one end of the transmitting coil 20; one end of the second coil 1312 is electrically connected to the other end of the transmitting coil 20, and the other end of the second coil 1312 is electrically connected to the source of the third low-frequency MOS transistor 123 and the drain of the fourth low-frequency MOS transistor 124.

[0050] The capacitive filter 132 includes a first filter capacitor 1321 and a second filter capacitor 1322 . The first filter capacitor 1321 and the second filter capacitor 1322 are connected in parallel at two ends of the transmitting coil 20 .

[0051] Specifically, one end of the first filter capacitor 1321 is electrically connected to one end of the transmitting coil 20, and the other end of the first filter capacitor 1321 is electrically connected to the negative terminal 114; one end of the second filter capacitor 1322 is electrically connected to the other end of the transmitting coil 20, and the other end of the second filter capacitor 1322 is electrically connected to the negative terminal 114. In order to obtain a better filtering effect, the first filter capacitor 1321 and the second filter capacitor 1322 are grounded, such as being electrically connected to the ground end of the circuit board.

[0052] The first half-bridge and the second half-bridge are electrically connected to the transmitting coil 20, the resonant capacitor 14 and the common-mode inductor 131 to form an H-type full-bridge connection. According to the driving signal, when the first low-frequency MOS transistor 121 and the fourth low-frequency MOS transistor 124 are turned on, the second low-frequency MOS transistor 122 and the third low-frequency MOS transistor 123 are turned off, and the current flows from the DC power supply through the first low-frequency MOS transistor 121 to the common-mode inductor 131, the transmitting coil 20 and the resonant capacitor 14, and then returns to the DC power supply through the fourth low-frequency MOS transistor 124 to form a closed loop, and the transmitting coil 20 generates a forward current at this time; when the second low-frequency MOS transistor 122 and the third low-frequency MOS transistor 123 are turned on, the first low-frequency MOS transistor 121 and the fourth low-frequency MOS transistor 124 are turned off, and the current flows from the DC power supply through the third low-frequency MOS transistor 123 to the resonant capacitor 14, the transmitting coil 20 and the common-mode inductor 131, and then returns to the DC power supply through the second low-frequency MOS transistor 122 to form a closed loop, and the transmitting coil 20 generates a reverse current at this time.

[0053] See also Figure 3 The radiation shielding mechanism 30 is installed on the emitting surface side of the transmitting coil 20 and covers the emitting surface of the transmitting coil 20. When wireless charging is performed, the radiation shielding mechanism 30 is located between the transmitting coil 20 and the receiving coil.

[0054] See also Figure 4 The radiation shielding mechanism 30 includes a connecting portion 31 and an absorbing portion 32. One end of the connecting portion 31 is connected to the ground terminal of the circuit board, and the other end is connected to the absorbing portion 32. The absorbing portion 32 includes a plurality of absorbing strips 322 arranged parallel to each other and spaced apart, and one end of each of the plurality of absorbing strips 322 is connected to the connecting portion 31. The absorbing portion 42 can be arranged in a circular shape or a square shape.

[0055] The radiation shielding mechanism 30 is preferably in the form of an FPC, which is preferably attached to the outer surface of the transmitting coil 20, or can be set on the inner wall or outer surface of the wireless charging device housing, or fixed in the wireless charging device housing. The radiation shielding mechanism 30 can be located between the transmitting coil 20 and the receiving coil, and this application does not limit it. When the radiation shielding mechanism covers the transmitting coil, under the action of the parasitic magnetic field, the absorption part generates a parasitic induced current, and the parasitic induced current will produce a negative magnetic field around the absorption part, and the negative magnetic field has a counteracting effect on the parasitic magnetic field, that is, the radiation energy generated by the parasitic magnetic field is converted into electrical energy in the absorption part and absorbed, further reducing the radiation interference of EMC. Therefore, the radiation energy that cannot be completely absorbed by the electromagnetic compatibility module 13 can be further absorbed by the radiation shielding mechanism, and the two work together to achieve a better anti-interference effect. In order to prevent the current generated by the absorption part from forming eddy currents and causing heating problems, in some embodiments, the other end of the connecting part 31 that is not connected to the absorption part 32 is grounded to conduct away the parasitic induced current. Specifically, the grounding end connected to the connecting part 31 can be the grounding end of the circuit board in the fast charging energy transmission structure 10, or it can be the shell of the fast charging wireless charging device.

[0056] In order to improve the reliability of the radiation shielding mechanism, in some embodiments, the number of connecting parts 31 can be set to multiple according to needs, one end of each connecting part 31 can be connected to a plurality of absorption strips 322, and multiple connecting parts 31 are connected to the ground end.

[0057] In order to avoid changes in the magnetic field caused by sudden changes in current, in some embodiments, the connecting portion 31 is preferably of uniform thickness, with a width ranging from 0.5mm-2.0mm, preferably 1.0mm; further, the widths of several absorption strips 322 are consistent, and the width range is 0.1mm to 0.5mm, preferably 0.2mm.

[0058] In order to avoid short circuits and eddy currents caused by small intervals between several absorption parts, in some embodiments, the interval between two adjacent absorption strips 322 is in the range of 0.1 mm-0.5 mm, preferably 0.2 mm.

[0059] To prevent the magnetic fields generated by two adjacent absorption parts from influencing each other, in some embodiments, the widths and intervals of two adjacent absorption strips 322 are equal.

[0060] Since the parasitic magnetic field is generated by high-frequency harmonics, even if the connecting part 31 conducts away the parasitic induced current, the absorbing part 32 itself will still generate a certain eddy current phenomenon. In order to further prevent the formation of eddy currents and cause heating problems, in some embodiments, in order to control the volume of the absorbing part 32, the shielding coverage area of ​​the absorbing part 32 matches the area of ​​the transmitting coil 20, and the area of ​​the absorbing part 32 is preferably greater than or equal to the area of ​​the transmitting coil 20. Taking the watch wireless charging device as an example, the diameter of the transmitting coil in the current watch wireless charger is 24mm, then the diameter of the absorbing part 32 is set at 24mm~26mm, and the corresponding diameter of the radiation shielding mechanism is 25mm~28mm.

[0061] Since the parasitic magnetic field is generated by high-frequency harmonics, if the conductivity of the absorbing part 32 is high, the absorbing part 32 is a conductor for the parasitic magnetic field and is equivalent to an insulator for the alternating magnetic field. Therefore, in some embodiments, the absorbing part 32 is made of a material with extremely high conductivity to achieve the effect of not affecting the passage of the alternating magnetic field and not affecting wireless charging. For example, the absorbing part 32 and the connecting part 31 are made of metals such as copper, gold, silver, and aluminum.

[0062] To reduce the loss, in some embodiments, the absorption strips 322 are preferably configured as parallel straight line segments; the absorption strips 322 may also be in the shape of non-straight line segments, such as arc-shaped line segments or wavy line segments.

[0063] See also Figure 5 and Figure 6 , Figure 5 This is the frequency-electric field strength test result diagram of using low-frequency MOS tubes but without common-mode inductance, capacitor filters, and radiation shielding mechanisms. Figure 5 It can be seen that the electric field strength at points 3 and 4 near 300MHz has exceeded the set standard value. Figure 6 This is the frequency-electric field strength test result diagram of using low-frequency MOS tubes and setting common-mode inductors, capacitor filters, and radiation shielding mechanisms. Figure 5 It can be seen that the electric field strength at any operating frequency does not exceed the standard value. Figure 5 The test results corresponding to the test result graph are shown in Table 1.

[0064] Table 1

[0065]

[0066] It can be seen that the fast charging wireless charging device described in the present invention, although using low-cost low-frequency MOS tubes as switches, can still meet the operating frequency requirements of the charging standard Qi2 and comply with EMC requirements while meeting the user's fast charging experience requirements.

[0067] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that, unless otherwise specified, "multiple" and "several" refer to two or more; "and / or" refers to and includes any or all possible combinations of one or more associated listed items; "first", "second", "third", etc. are only used to distinguish, rather than to describe a specific order or sequence, and cannot be understood as indicating or implying relative importance. When the above description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0068] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.

Claims

1. A fast charging energy transmission structure, characterized in that: include: A circuit board, on which a transmitting circuit is arranged, wherein the transmitting circuit comprises a DC power input terminal electrically connected to a power supply terminal of the circuit board, a full-bridge switch circuit electrically connected to the DC power input terminal, and an electromagnetic compatibility module electrically connected to the full-bridge switch circuit; a transmitting coil, electrically connected to the electromagnetic compatibility module, and the transmitting coil is electrically connected to the full-bridge switch circuit through the electromagnetic compatibility module; A radiation shielding mechanism connected to the ground terminal is installed on the emitting surface side of the transmitting coil.

2. The fast charging energy transmission structure according to claim 1, characterized in that: The full-bridge switch circuit comprises a first half-bridge and a second half-bridge, wherein the first half-bridge and the second half-bridge are electrically connected to the DC power supply input terminal; The electromagnetic compatibility module includes common mode inductor and capacitor filters; The common-mode inductor includes a first coil and a second coil, one end of the transmitting coil is electrically connected to the first half-bridge through the first coil, and the other end of the transmitting coil is electrically connected to the second half-bridge through the second coil; The capacitive filter includes a first filter capacitor and a second filter capacitor. The two ends of the transmitting coil are electrically connected to one end of the first filter capacitor and one end of the second filter capacitor respectively. The other end of the first filter capacitor and the other end of the second filter capacitor are both grounded.

3. The fast charging energy transmission structure according to claim 2, characterized in that: The first half-bridge includes a first low-frequency MOS transistor and a second low-frequency MOS transistor, the second half-bridge includes a third low-frequency MOS transistor and a fourth low-frequency MOS transistor, and the first low-frequency MOS transistor, the second low-frequency MOS transistor, the third low-frequency MOS transistor and the fourth low-frequency MOS transistor are N-type MOS transistors; One end of the first coil is electrically connected to the source of the first low-frequency MOS transistor and the drain of the second low-frequency MOS transistor, and the other end of the first coil is electrically connected to one end of the transmitting coil; one end of the second coil is electrically connected to the source of the third low-frequency MOS transistor and the drain of the fourth low-frequency MOS transistor, and the other end of the second coil is electrically connected to the other end of the transmitting coil.

4. The fast charging energy transmission structure according to claim 3, characterized in that: The DC power supply input terminal includes a positive terminal and a negative terminal, the negative terminal is connected to the ground terminal, the drain of the first low-frequency MOS tube and the drain of the third low-frequency MOS tube are electrically connected to the positive terminal, and the source of the second low-frequency MOS tube and the source of the fourth low-frequency MOS tube are electrically connected to the negative terminal.

5. The fast charging energy transmission structure according to claim 3, characterized in that: The switching frequencies of the first low-frequency MOS tube, the second low-frequency MOS tube, the third low-frequency MOS tube and the fourth low-frequency MOS tube are less than or equal to 1 MHz.

6. The fast charging energy transmission structure according to claim 3, characterized in that: The transmitting circuit also includes a resonant capacitor, one end of the second coil is electrically connected to one end of the resonant capacitor, and the other end of the resonant capacitor is electrically connected to the source of the third low-frequency MOS tube and the drain of the fourth low-frequency MOS tube.

7. The fast charging energy transmission structure according to claim 2, characterized in that: The first coil and the second coil are symmetrically wound on an annular magnetic core.

8. The fast charging energy transmission structure according to any one of claims 1 to 7, characterized in that: The radiation shielding mechanism comprises a connecting part and an absorbing part; one end of the connecting part is connected to the ground end, and the other end of the connecting part is connected to the absorbing part; the area of ​​the absorbing part can cover the emitting surface of the transmitting coil.

9. The fast charging energy transmission structure according to claim 8, characterized in that: The absorption part comprises a plurality of absorption strips which are parallel to each other and arranged at intervals, and one end of each of the absorption strips is connected to the connection part.

10. The fast charging energy transmission structure according to claim 9, characterized in that: The absorption strips are parallel straight line segments, arc-shaped line segments, or wavy line segments.

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