Circuit board and wireless charger

Abstract

The utility model provides a circuit board and a wireless charger. The circuit board is provided with a first end and a second end which are oppositely arranged; the circuit board is provided with a separation groove in the direction from the first end to the second end. The separating groove is provided with a third end and a fourth end which are oppositely arranged in the extending direction of the separating groove; the third end penetrates through the first end; a card detection module is arranged between the second end and the fourth end; the card detection module comprises a near-field communication chip and a near-field communication antenna which are connected with each other; the near field communication antenna is arranged along the extension direction of the separation groove. Based on the above structure, the circuit board is separated through the separation groove, the eddy current effect generated by the near field communication antenna can be weakened, and then the detection accuracy of the card detection module on the card is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless charging, in particular to a circuit board and a wireless charger. BACKGROUND

[0002] In the prior art, a wireless charger is built-in with a card detection module and a charging module. The charging module charges a device to be charged by emitting high-frequency electromagnetic waves, and the card detection module is used to detect whether there is a card near the device to be charged. If there is a card, the user is reminded in time to prevent the high-frequency electromagnetic waves emitted by the charging module from damaging the card. The card detection module usually includes a near field communication (NFC) antenna, which will produce an eddy current effect, thereby affecting the detection accuracy of the card. How to weaken the eddy current effect is a problem to be solved. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a circuit board and a wireless charger to weaken the eddy current effect in the circuit board.

[0004] In a first aspect, the present application provides a circuit board, which has a first end and a second end arranged opposite to each other. A separation groove is formed along the direction from the first end to the second end of the circuit board. The separation groove has a third end and a fourth end arranged opposite to each other in the extension direction of the separation groove. The third end penetrates the first end. A card detection module is arranged between the second end and the fourth end. The card detection module includes a near field communication chip and a near field communication antenna connected to each other. The near field communication antenna is arranged along the extension direction of the separation groove.

[0005] In a second aspect, the present application provides a wireless charger, which includes a first shell, a second shell, a spacing plate, a charging module, and the circuit board of any one of the embodiments. The charging module includes a coil, a detection circuit, and a resonance circuit. The first shell and the second shell are connected to form a containing cavity. The spacing plate is arranged between the coil and the circuit board. The detection circuit and the resonance circuit are arranged on the circuit board. The circuit board, the charging module, and the spacing plate are arranged in the containing cavity.

[0006] The present application can achieve the following beneficial effects: by the separation groove, the circuit board is separated, which can weaken the eddy current effect generated by the near field communication antenna, thereby improving the detection accuracy of the card detection module for the card. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0008] Figure 1 A structural schematic diagram of a circuit board provided for an embodiment of the present application;

[0009] Figure 2 A structural schematic diagram of a circuit board provided for an embodiment of the present application;

[0010] Figure 3 A structural schematic diagram of a circuit board provided for an embodiment of the present application;

[0011] Figure 4 A structural schematic diagram of a charging module provided for an embodiment of the present application;

[0012] Figure 5 A structural schematic diagram of a circuit board and a charging module provided for an embodiment of the present application;

[0013] Figure 6 A structural schematic diagram of a wireless charger provided for an embodiment of the present application;

[0014] Figure 7 A structural schematic diagram of a wireless charger provided for an embodiment of the present application.

[0015] Reference signs:

[0016] 1-circuit board, 10-first end, 11-second end, 12-separation groove, 120-third end, 121-fourth end, 13-card detection module, 130-near field communication chip, 131-near field communication antenna, 14-input module, 15-first voltage reduction module, 16-conversion module, 17-thermistor, 18-control module, 19-communication module, 20-second voltage reduction module, 21-first transistor, 22-filter module, 2-charging module, 30-charging circuit, 31-detection circuit, 32-resonance circuit, 300-coil, N1-first NMOS transistor, N2-second NMOS transistor, N3-third NMOS transistor, 3-first shell, 4-second shell, 5-spacer plate, 6-receiving cavity, 7-fastener, L1-first coil, L2-second coil, L3-third coil, L4-first inductor, L5-second inductor, L6-third inductor, C1-first capacitor, C2-second capacitor, C3-third capacitor. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0018] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "vertical direction", "upper", "lower", "horizontal" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, "first", "second", "third", "fourth" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be connected through an intermediate medium, it can be the communication inside two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] In the description of the present application, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such article or device. Without more limitation, the element defined by the sentence "including a…" does not exclude the presence of another identical element in the article or device including the element.

[0021] In the prior art, the wireless charger is built-in with a card detection module and a charging module. The charging module charges the device to be charged by emitting high-frequency electromagnetic waves, and the card detection module is used to detect whether there is a card near the device to be charged. If there is a card, the user is reminded in time to prevent the high-frequency electromagnetic waves emitted by the charging module from damaging the card. The card detection module usually includes a near field communication (NFC) antenna, which will produce eddy current effect, thereby affecting the detection accuracy of the card.

[0022] In view of the problem of the existing wireless charger that eddy current effect exists, the application provides a circuit board and a wireless charger to overcome the above problem.

[0023] The application provides a circuit board and a wireless charger.

[0024] In some embodiments, referring to Figure 1 The application provides a circuit board 1, which has a first end 10 and a second end 11 arranged opposite to each other; the circuit board 1 is provided with a separation groove 12 along the direction from the first end 10 to the second end 11; the separation groove 12 has a third end 120 and a fourth end 121 arranged opposite to each other in the extension direction of the separation groove 12; the third end 120 penetrates through the first end 10; a card detection module 13 is arranged between the second end 11 and the fourth end 121; the card detection module 13 comprises a near field communication chip 130 and a near field communication antenna 131 connected to each other; the near field communication antenna 131 is arranged along the extension direction of the separation groove 12.

[0025] In some embodiments, the near field communication chip 130 is a chip with NFC function, and the near field communication antenna 131 is an NFC antenna. Eddy current effect is generated at the near field communication antenna 131, the circuit board 1 is separated by the separation groove 12, the surface current excited on the circuit board 1 is cut off, the eddy current effect generated by the near field communication antenna 131 is weakened, and thus the detection accuracy of the card detection module 13 on the card is improved.

[0026] In some embodiments, referring to Figure 2 The circuit board 1 further comprises an input module 14, a first voltage reduction module 15 and a conversion module 16; the input module 14 is connected to an external power supply and the first voltage reduction module 15 respectively; the first voltage reduction module 15 is connected to the conversion module 16 and is used for reducing the voltage of the external power supply to obtain a first direct current; the conversion module 16 is used for converting the first direct current into a first alternating current. Specifically, the circuit board 1 can be arranged in a vehicle, and the external power supply can be a vehicle body battery providing direct current. The first voltage reduction module 15 is a voltage reduction circuit.

[0027] In some embodiments, the conversion module 16 is connected to a charging module 2, the conversion module 16 supplies power to the charging module 2 by using the first alternating current; and the charging module 2 performs wireless charging on a device to be charged (for example, a mobile phone) in a charging area by using the first alternating current. The area near the charging module 2 is the charging area, for example, the upper side of the circuit board 1.

[0028] In some embodiments, referring to Figure 2As shown, the circuit board 1 is further provided with a thermistor 17, a control module 18, and a communication module 19; the communication module 19 is connected with the input module 14 and the control module 18 respectively; the control module 18 is connected with the conversion module 16 and the thermistor 17 respectively; the thermistor 17 is in contact with the charging module 2 and is used to send resistance data to the control module 18; the control module 18 is used to determine temperature alarm information according to the resistance data and send the temperature alarm information to the communication module 19; the communication module 19 is used to send the temperature alarm information to a display terminal; and the display terminal is used to display the temperature alarm information.

[0029] In some embodiments, the thermistor 17 is in contact with the charging module 2. In the case that the working time of the charging module 2 is too long and the temperature of the charging module 2 rises, the temperature of the thermistor 17 also rises, and the resistance data of the thermistor 17 changes. The resistance data of the thermistor 17 is correlated with the temperature data of the thermistor 17. Therefore, the control module 18 is used to receive the resistance data, determine the temperature data of the thermistor 17 according to the resistance data, make the temperature data of the charging module 2 equal to the temperature data of the thermistor 17, compare the temperature data of the charging module 2 with a preset temperature threshold, and in the case that the temperature data of the charging module 2 is greater than the preset temperature threshold, generate temperature alarm information and send the temperature alarm information to the communication module 19. The communication module 19 is used to send the temperature alarm information to a display terminal; and the display terminal is used to display the temperature alarm information. The display terminal is a vehicle-mounted display terminal arranged in a vehicle. Based on this embodiment, the user can be informed of the charging abnormality in time in a vehicle-mounted scenario.

[0030] In some embodiments, the communication module 19 includes a controller area network bus chip. The controller area network bus chip, i.e. CAN (Controller Area Network) chip, is suitable for a vehicle-mounted scenario, supports CAN protocol, and the characteristics of the CAN protocol include complete serial data communication, real-time support, high transmission rate, bit addressing, and error detection capability.

[0031] In some embodiments, as shown in Figure 2 As shown, the circuit board 1 is further provided with a second voltage reduction module 20; the second voltage reduction module 20 is connected with the input module 14 and the control module 18 respectively; the second voltage reduction module 20 is used to reduce the voltage of an external power supply to obtain a second direct current; the second direct current is used to power the control module 18; and the control module 18 is connected with the card detection module 13 and is used to power the card detection module 13 with the second direct current. The second voltage reduction module 20 is a kind of voltage reduction circuit.

[0032] In some embodiments, the control module 18 is a microcontroller unit (MCU), which is an integrated chip obtained by reducing the frequency and specifications of a central processing unit (CPU) and integrating memory, counters, programmable logic controllers, drive circuits and other structures.

[0033] In some embodiments, the power supply voltage required by the conversion module 16 is not equal to the power supply voltage required by the control module 18, so the first voltage reduction module 15 and the second voltage reduction module 20 are arranged at the same time to provide different voltages.

[0034] In some embodiments, the card detection module 13 is used to detect whether there is a card in the charging area; in the case where it is determined that there is a card in the charging area, the card alarm information is sent to the control module 18; the control module 18 is used to send the card alarm information to the communication module 19; the communication module 19 is used to send the card alarm information to the display terminal; and the display terminal is used to display the card alarm information. Based on this embodiment, the user can be reminded in time to take the card out of the charging area, so as to avoid the card from being damaged.

[0035] In some embodiments, wireless charging is achieved by sending high-power electromagnetic wave / magnetic field signals through the coil 300 to realize near-field transmission of energy. However, the high-power electromagnetic wave / magnetic field signal can cause damage to cards such as access control cards, bank cards and employee identity information cards containing near-field identification. When the user places such a card on the back of the mobile phone and places the mobile phone and the card together in the charging area for wireless charging, the high-power electromagnetic wave / magnetic field signal can cause irreversible damage to the card. The card detection module 13 can timely detect the card in the charging area.

[0036] In some embodiments, as shown in Figure 3 The circuit board 1 is also arranged with a first transistor 21. The first transistor 21 is connected with the control module 18 and the thermistor 17. When wireless charging is not needed, the first transistor 21 is turned off, so that the connection between the control module 18 and the thermistor 17 is disconnected, avoiding the thermistor 17 from consuming electric energy. When wireless charging is needed, the first transistor 21 is turned on, that is, the connection between the control module 18 and the thermistor 17 is turned on, so that the thermistor 17 can be used to reflect the temperature data of the charging module 2. Specifically, the first transistor 21 is a PMOS (positive channel Metal Oxide Semiconductor), that is, a MOS tube with an n-type substrate, a p-channel and a hole flow to carry current.

[0037] In some embodiments, as shown in Figure 3As shown, the circuit board 1 is further provided with a filter module 22, which is connected with the input module 14, the first voltage reduction module 15 and the second voltage reduction module 20 respectively. The filter module 22 is specifically a filter circuit, which is used to reduce the alternating component in the external power supply and retain the direct current component, so that the waveform of the external power supply remains smooth.

[0038] The application provides a charging module 2, as shown in Figure 4 As shown, the charging module 2 comprises a charging circuit 30, a detection circuit 31 and a resonance circuit 32; the charging circuit 30 comprises one or more charging units; each charging unit comprises a coil 300 and a second transistor connected with each other; the thermistor 17 is in contact with the coil 300. In the process of wireless charging, the coil 300 is more likely to heat up, and the thermistor 17 is in contact with the coil 300, so that the resistance data of the thermistor 17 can more accurately reflect the temperature change of the charging module 2.

[0039] In some embodiments, each charging unit comprises a coil 300 and a second transistor connected with each other. The second transistor can be specifically an NMOS (N-Metal-Oxide-Semiconductor, N-type metal-oxide-semiconductor) transistor. The coil 300 continuously emits magnetic field signals to the outside by using electric energy, so as to perform wireless charging on the device to be charged. The second transistor is used as a switch to control the connection and disconnection between the coil 300 and the conversion module 16.

[0040] In some embodiments, the ferrite in the coil 300 is made of a material with high magnetic permeability, which is conducive to improving the accuracy of Q value detection.

[0041] In some embodiments, the charging circuit 30 is connected with the conversion module 16, the control module 18, the detection circuit 31 and the resonance circuit 32 respectively; the detection circuit 31 is connected with the resonance circuit 32, the control module 18 and the conversion module 16 respectively; and the resonance circuit 32 is connected with the conversion module 16.

[0042] In some embodiments, when the charging circuit 30 comprises one charging unit, the charging unit is connected with the control module 18, the conversion module 16, the resonance circuit 32 and the detection circuit 31 respectively.

[0043] In some embodiments, when the charging circuit 30 comprises a plurality of charging units, the plurality of charging units are connected in parallel, and then the parallel-connected charging units are connected with the control module 18, the conversion module 16, the resonance circuit 32 and the detection circuit 31.

[0044] In some embodiments, the detection circuit 31 is a Q value detection circuit. When the metal-containing object is close to the coil 300, the Q value of the object changes. The detection circuit 31 is used to obtain the Q value of the object, and determine whether the object is a device to be charged or a metal foreign object according to the Q value.

[0045] In some embodiments, when it is determined that the device to be charged is close to the coil 300, the charging unit is used to charge the device to be charged. Specifically, in the case of including multiple charging units, the distance between the device to be charged and the multiple coils 300 is determined, the coil 300 closest to the device to be charged is selected as the target coil 300, and it is determined whether the distance between the device to be charged and the target coil 300 is less than a preset distance threshold. In the case of less than, the charging condition is met, the second transistor connected to the target coil 300 is turned on, and the target coil 300 charges the device to be charged.

[0046] Based on the above embodiments, multiple charging units are arranged in the wireless charging circuit 30, which can expand the area of the charging area.

[0047] In some embodiments, the resonance circuit 32 is connected to the detection circuit 31 and the conversion module 16 respectively; the resonance circuit 32 includes one or more resonance units; the resonance unit includes a capacitor and an inductor connected in series; the resonance circuit 32 is used to step up the first alternating current output by the conversion module 16 to obtain the second alternating current.

[0048] In some embodiments, the coil 300 in the charging circuit 30 uses the first alternating current to step up to obtain the second alternating current, and continuously emits a magnetic field signal to the outside for wireless charging of the device to be charged.

[0049] In some embodiments, the number of resonance units is equal to the number of charging units. The resonance unit and the charging unit are connected one by one.

[0050] In some embodiments, when the resonance circuit 32 includes one resonance unit, the resonance unit is connected to the conversion module 16, the detection circuit 31, and the charging circuit 30 respectively.

[0051] In some embodiments, when the charging circuit 30 includes multiple resonance units, the multiple resonance units are connected in parallel, and then the parallel resonance units are connected to the conversion module 16, the detection circuit 31, and the charging circuit 30.

[0052] In some embodiments, refer to Figure 5As shown, the input module 14 includes: a first pin GND, a second pin BCAN_L, and a third pin BCAN_H, wherein the first pin GND is grounded, and the second pin BCAN_L and the third pin BCAN_H are connected with the communication module 19. The communication module 19 includes: a fourth pin RXD0, a fifth pin TXD0, and a sixth pin STB_BCAN, which are connected with the control module 18. The control module 18 includes a seventh pin L1_EN, an eighth pin L2_EN, a ninth pin L3_EN, a twelfth pin PWM, a thirteenth pin VDEM, a fourteenth pin IDEM, and a fifteenth pin MCU_EN, wherein the twelfth pin PWM, the thirteenth pin VDEM, the fourteenth pin IDEM, and the fifteenth pin MCU_EN are connected with the conversion module 16. The first voltage reduction module 15 includes: a tenth pin EN and an eleventh pin DAC-PWM, which are connected with the control module 18. In the charging circuit 30, a first charging unit, a second charging unit, and a third charging unit are connected in parallel. The first charging unit includes a first NMOS transistor N1 and a first coil L1. The second charging unit includes a second NMOS transistor N2 and a second coil L2. The third charging unit includes a third NMOS transistor N3 and a third coil L3. The first NMOS transistor N1, the second NMOS transistor N2, and the third NMOS transistor N3 are collectively referred to as “second transistors”. The first NMOS transistor N1 is connected with the control module 18 through the seventh pin L1_EN. The second NMOS transistor N2 is connected with the control module 18 through the eighth pin L2_EN. The third NMOS transistor N3 is connected with the control module 18 through the ninth pin L3_EN. In the resonance circuit 32, a first resonance unit, a second resonance unit, and a third resonance unit are connected in parallel. The first resonance unit includes a first inductor L1 and a first capacitor C1. The second resonance unit includes a second inductor L2 and a second capacitor C2. The third resonance unit includes a third inductor L3 and a third capacitor C3. The first resonance unit is connected with the third charging unit, and is used to step up the first alternating current output by the conversion module 16 to obtain a second alternating current, and transmit the second alternating current to the third coil L3, so that the third coil L3 realizes wireless charging by using the second alternating current. The second resonance unit is connected with the second charging unit, and is used to step up the first alternating current output by the conversion module 16 to obtain a second alternating current, and transmit the second alternating current to the second coil L2, so that the second coil L2 realizes wireless charging by using the second alternating current.The third resonant unit is connected with the first charging unit, and is used for boosting the first alternating current output by the conversion module 16 to obtain a second alternating current, and transmitting the second alternating current to the first coil L1, so that the first coil L1 realizes wireless charging by using the second alternating current.

[0053] The application provides a wireless charger, referring to Figure 6 and Figure 7 The wireless charger comprises a first shell 3, a second shell 4, a spacing plate 5, a charging module 2 and a circuit board 1 as any one of the above embodiments; the charging module 2 comprises a coil 300, a detection circuit 31 and a resonant circuit 32; the first shell 3 and the second shell 4 are connected to form a containing cavity 6; the spacing plate 5 is arranged between the coil 300 and the circuit board 1; the detection circuit 31 and the resonant circuit 32 are arranged on the circuit board 1; and the circuit board 1, the charging module 2 and the spacing plate 5 are arranged in the containing cavity 6.

[0054] In some embodiments, the circuit board 1 is arranged with a conversion module 16; the conversion module 16 is connected with the detection circuit 31, the resonant circuit 32 and the coil 300 respectively; the detection circuit 31 is connected with the coil 300 and the resonant circuit 32 respectively; and the coil 300 is connected with the resonant circuit 32.

[0055] In some embodiments, the first shell 3 and the second shell 4 provide a protection function for the circuit board 1, the spacing plate 5 and the charging module 2. The coil 300 can be fixedly attached to a surface of the spacing plate 5, and the spacing plate 5 provides a support function for the coil 300.

[0056] In some embodiments, the wireless charger comprises a fastener 7, and the first shell 3 and the second shell 4 are connected by the fastener 7. The fastener 7 can be a screw, or can be a stud, a bolt or a rivet, and is not limited here.

[0057] In some embodiments, the wireless charging can be realized by placing the device to be charged on the first shell 3.

[0058] In conclusion, although the application has disclosed the above preferred embodiments, the above preferred embodiments are not used to limit the application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the application, so the protection scope of the application is subject to the scope defined by the claims.

Claims

1. A circuit board, characterized by, The circuit board (1) has a first end (10) and a second end (11) opposite to each other; the circuit board (1) is provided with a separation groove (12) along the direction from the first end (10) to the second end (11); the separation groove (12) has a third end (120) and a fourth end (121) opposite to each other in the extension direction thereof; the third end (120) penetrates the first end (10); The second end (11) and the fourth end (121) are provided with a card detection module (13); the card detection module (13) comprises a near field communication chip (130) and a near field communication antenna (131) connected with each other; the near field communication antenna (131) is arranged along the extension direction of the separation groove (12).

2. The circuit board of claim 1, wherein The circuit board (1) is further provided with an input module (14), a first voltage reduction module (15) and a conversion module (16); The input module (14) is connected with an external power supply and the first voltage reduction module (15) respectively; The first voltage reduction module (15) is connected with the conversion module (16) and is used for reducing the voltage of the external power supply to obtain a first direct current; The conversion module (16) is used for converting the first direct current into a first alternating current.

3. The circuit board of claim 2, wherein, The circuit board (1) is further provided with a thermistor (17), a control module (18) and a communication module (19); The communication module (19) is connected with the input module (14) and the control module (18) respectively; the control module (18) is connected with the conversion module (16) and the thermistor (17) respectively; The thermistor (17) is in contact with a charging module (2) and is used for sending resistance data to the control module (18); The control module (18) is used for determining temperature alarm information according to the resistance data and sending the temperature alarm information to the communication module (19); The communication module (19) is used for sending the temperature alarm information to a display terminal; and the display terminal is used for displaying the temperature alarm information.

4. The circuit board of claim 3, wherein The communication module (19) comprises a controller area network bus chip.

5. The circuit board of claim 3, wherein The circuit board (1) is further provided with a second voltage reduction module (20); the second voltage reduction module (20) is connected with the input module (14) and the control module (18) respectively; The second voltage reduction module (20) is used for reducing the voltage of the external power supply to obtain a second direct current; and the second direct current is used for supplying power to the control module (18); The control module (18) is connected with the card detection module (13) and is used for supplying power to the card detection module (13) by using the second direct current.

6. The circuit board of claim 5, wherein, The card detection module (13) is used for detecting whether a card exists in a charging area; and in the case that it is determined that the card exists in the charging area, the card detection module (13) sends card alarm information to the control module (18); The control module (18) is used for sending the card alarm information to the communication module (19); The communication module (19) is used for sending the card alarm information to the display terminal; and the display terminal is used for displaying the card alarm information.

7. The circuit board of claim 3, wherein The circuit board (1) is further provided with a first transistor (21); the first transistor (21) is connected with the control module (18) and the thermistor (17) respectively.

8. The circuit board of claim 5, wherein, The circuit board (1) is further provided with a filter module (22); the filter module (22) is connected with the input module (14), the first voltage reduction module (15) and the second voltage reduction module (20) respectively.

9. A wireless charger, comprising: The wireless charger comprises a first shell (3), a second shell (4), a spacing plate (5), a charging module (2) and the circuit board (1) as claimed in any one of claims 1 to 8. The charging module (2) comprises a coil (300), a detection circuit (31) and a resonance circuit (32). The first shell (3) and the second shell (4) are connected to form a containing cavity (6); the spacing plate (5) is arranged between the coil (300) and the circuit board (1); the detection circuit (31) and the resonance circuit (32) are arranged on the circuit board (1); The circuit board (1), the charging module (2) and the spacing plate (5) are arranged in the containing cavity (6).

10. The wireless charger of claim 9, wherein, The circuit board (1) is provided with a conversion module (16); the conversion module (16) is connected with the detection circuit (31), the resonance circuit (32) and the coil (300) respectively; the detection circuit (31) is connected with the coil (300) and the resonance circuit (32) respectively; the coil (300) is connected with the resonance circuit (32).

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