CN210927149U - Wireless charging device of electric toothbrush - Google Patents

Abstract

The application discloses wireless charging device of electric toothbrush for charge for electric toothbrush. The electric toothbrush has a coil receiving end. The wireless charging device comprises a coil transmitting end, a coil driving circuit, a power supply circuit, a processing chip and a current control circuit. The coil transmitting end is electrically connected with the coil driving circuit, the power supply circuit comprises a power supply and is electrically connected with the coil driving circuit, and the coil driving circuit is electrically connected with the processing chip. When the coil transmitting end is placed corresponding to the coil receiving end of the electric toothbrush, the processing chip controls the coil driving circuit to provide electric energy for the coil transmitting end. The processing chip is also used for controlling the current passing through the coil driving circuit through the current control circuit. Due to the adoption of a wireless charging mode, the electric toothbrush has good sealing performance, water is not easy to permeate into the electric toothbrush, and the potential safety hazard of using the electric toothbrush is reduced. Meanwhile, the wireless charging provides a convenient charging mode for the charging of the electric toothbrush.

Description

Wireless charging device of electric toothbrush

Technical Field

The application relates to the field of electric toothbrush circuit control, in particular to a wireless charging device for an electric toothbrush.

Background

The toothbrush is a necessary daily article in daily life. The appearance of the electric toothbrush brings convenience for people to wash, but the traditional charging mode of the electric toothbrush still remains wired charging, battery use and other modes for supplying power to the electric toothbrush. Wired charging and batteries, when used, can cause inconvenience themselves and can cause harm to the circuitry inside the electric toothbrush from water permeating through the charging socket or the battery case back shell.

SUMMERY OF THE UTILITY MODEL

The application provides a wireless charging device of electric toothbrush can prevent that water from passing through the potential safety hazard that the inside circuit of electric toothbrush caused of charging socket or battery case backshell infiltration, simultaneously, provides convenient charging mode.

The application provides a wireless charging device of electric toothbrush for charge for electric toothbrush, electric toothbrush has the coil receiving end, wireless charging device includes: coil transmitting terminal, coil drive circuit, power supply circuit, processing chip and current control circuit, the coil transmitting terminal with the coil drive circuit electricity is connected, power supply circuit includes power supply, power supply with the coil drive circuit electricity is connected, just the coil drive circuit still with the processing chip electricity is connected, works as when the coil transmitting terminal corresponds the coil receiving terminal of electric toothbrush and places, processing chip control the coil drive circuit does the coil transmitting terminal provides the electric energy, processing chip still is used for passing through current control circuit control passes through coil drive circuit's electric current size.

Due to the adoption of the wireless charging mode, the opening of the shell of the electric toothbrush is not required to be charged in a wired mode or the battery is not required to be replaced, the electric toothbrush has good sealing performance, water is not easy to permeate into the electric toothbrush, and the potential safety hazard of using the electric toothbrush is reduced. Meanwhile, the wireless charging provides a convenient charging mode for the charging of the electric toothbrush.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any inventive exercise.

Fig. 1 is a schematic view of a wireless charging device for an electric toothbrush according to a first embodiment of the present application.

Fig. 2 is a schematic diagram of a coil driving circuit according to a first embodiment of the present application.

Fig. 3 is a schematic diagram of a minimum current control circuit according to a first embodiment of the present disclosure.

Fig. 4 is a schematic diagram of a maximum current control circuit according to a first embodiment of the present application.

Fig. 5 is a schematic view of a wireless charging device frame of an electric toothbrush according to a second embodiment of the present application.

Fig. 6 is a schematic diagram of a power control circuit according to a second embodiment of the present application.

Fig. 7 is a schematic view of a wireless charging device frame of an electric toothbrush according to a third embodiment of the present application.

Fig. 8 is a schematic diagram of a state display driving circuit according to a third embodiment of the present application.

Fig. 9 is a schematic view of a wireless charging device frame of an electric toothbrush according to a fourth embodiment of the present application.

Fig. 10 is a schematic diagram of a current detection circuit according to a fourth embodiment of the present application.

Fig. 11 is a schematic diagram of a power supply circuit according to an embodiment of the present application.

Fig. 12 is a schematic diagram of a processing chip according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Referring to fig. 1, fig. 1 is a schematic view of a wireless charging device for an electric toothbrush according to a first embodiment of the present application. The wireless charging device 1 for the electric toothbrush is used for charging the electric toothbrush, and the electric toothbrush is provided with a coil receiving end. The wireless charging device includes: coil transmitting terminal 10, coil driving circuit 20, power supply circuit 30, processing chip 40, and current control circuit 50. The coil transmitting terminal 10 is electrically connected to the coil driving circuit 20. The power supply circuit 30 includes a power supply electrically connected to the coil driving circuit 20, and the coil driving circuit 20 is further electrically connected to the processing chip 40. When the coil transmitting terminal 10 is disposed corresponding to the coil receiving terminal of the electric toothbrush, the processing chip 40 controls the coil driving circuit 20 to provide electric energy to the coil transmitting terminal 10. The processing chip 40 is further configured to control the magnitude of the current passing through the coil driving circuit 20 through the current control circuit 50.

Specifically, in the present embodiment, the electric toothbrush wireless charging device 1 charges by using the principle of electromagnetic induction, and the coil transmitter 10 is provided in the electric toothbrush wireless charging device 1, and the coil receiver is provided in the electric toothbrush. The coil transmitting terminal 10 sends out an electromagnetic signal to the outside under the action of electric power, and the coil receiving terminal receives the electromagnetic signal and converts the electromagnetic signal into charging current, so that the purpose of wireless charging is achieved.

It can be understood that, because the wireless charging mode is adopted, the opening of the shell of the electric toothbrush is not required to be charged in a wired mode or the battery is not required to be replaced, the electric toothbrush has good sealing performance, water is not easy to permeate into the electric toothbrush, and the potential safety hazard of using the electric toothbrush is reduced. Meanwhile, the wireless charging provides a convenient charging mode for the charging of the electric toothbrush.

In one possible implementation, please refer to fig. 2, and fig. 2 is a schematic diagram of a coil driving circuit according to a first implementation of the present application. The coil driving circuit 20 includes a schottky diode D1, a capacitor C5, a capacitor C6, and a capacitor C7, wherein one end of each of the capacitor C5, the capacitor C6, and the capacitor C7 is electrically connected to the coil emitting terminal 10 and the power supply 310, the other end of each of the capacitor C5 and the capacitor C6 is electrically connected to the other end of the coil emitting terminal 10 and to the cathodes of the processing chip 40 and the schottky diode D1, the anode of the schottky diode D1 is electrically connected to the processing chip 40, and the other end of the capacitor C7 is grounded.

Specifically, since a current of 2 amperes can drive the coil transmitting terminal 10 well under normal conditions, the current of 2 amperes has a large current value in the circuit. Schottky diode D1 is used to rectify current in a larger current circuit. The coil transmitting end 10 will generate heat during normal operation. Therefore, in the present embodiment, the capacitor C5 and the capacitor C6 serve as energy storage capacitors of the coil transmitting terminal 10, and have the functions of resisting electromagnetic signal interference and improving power factor. The capacitor C5 and the capacitor C6 may be temperature-insensitive capacitors (NPO). The NPO capacitor is a temperature compensation ceramic capacitor, and the properties of the NPO capacitor cannot be changed when the temperature changes within a certain range. The capacitor C7 is an energy storage capacitor of the power supply 310, and has the functions of resisting electromagnetic signal interference and improving power factor.

Specifically, the processing chip 40 has pins 12 and 13. As shown in fig. 2, the other ends of the capacitor C5 and the capacitor C6 are electrically connected to the other end of the coil emitter 10 and to pin No. 12 of the processing chip 40 through a node P12, and the anode of the schottky diode D1 is electrically connected to pin No. 13 of the processing chip 40 through a node P13.

It is understood that, in the present embodiment, NPO capacitors are used for the capacitors C5 and C6. The capacitor C5 and the capacitor C6 are not easily affected by the heat generated by the coil transmitting terminal 10, so that the stability and the safety of the wireless charging device 1 for the electric toothbrush are improved.

In one possible implementation, please refer to fig. 3 and fig. 4 together, fig. 3 is a schematic diagram of a minimum current control circuit according to a first implementation of the present application; fig. 4 is a schematic diagram of a maximum current control circuit according to a first embodiment of the present application. The current control circuit 50 includes: a minimum current control circuit 510 and a maximum current control circuit 520, wherein the minimum current control circuit 510 is configured to send a minimum current value to the processing chip 40, the maximum current control circuit 520 is configured to send a maximum current value to the processing chip 40, the processing chip 40 controls a current value of the coil driving circuit 20 to be greater than or equal to the minimum current value and less than or equal to the maximum current value, and the minimum current control circuit 510 includes: a resistor R2 and a resistor R9, wherein one end of the resistor R2 is electrically connected with the processing chip 40, the other end of the resistor R2 is electrically connected with one end of the resistor R9, a node of the resistor R2, which is electrically connected with the resistor R9, is electrically connected with the processing chip 40, and the other end of the resistor R9 is grounded; the maximum current control circuit 520 includes: the circuit comprises a resistor R3 and a resistor R10, wherein one end of the resistor R3 is electrically connected with the processing chip 40, the other end of the resistor R3 is electrically connected with one end of a resistor R10, a node of the resistor R3, which is electrically connected with the resistor R10, is electrically connected with the processing chip 40, and the other end of the resistor R10 is grounded.

Specifically, the processing chip 40 has pin No. 1 and pin No. 7, and the pin No. 7 of the processing chip 40 can output a stable voltage. As shown in FIG. 3, one end of the resistor R2 is electrically connected to pin No. 7 of the processing chip 40 through a node P7. The node of the resistor R2 electrically connected with the resistor R9 is electrically connected with pin No. 1 of the processing chip 40 through a node P1. The resistor R2 and the resistor R9 are shunt resistors, and the resistances of the resistor R2 and the resistor R9 are different, so that the signals finally flow to the pins 401 of the processing chip. In this embodiment, the resistance of the resistor R2 is 20K Ω, and the resistance of the resistor R9 is 5.1K Ω. The minimum current control circuit 510 generates a minimum current value corresponding to the resistances of the resistor R2 and the resistor R9, and sends the minimum current value to the processing chip 40.

Specifically, the processing chip 40 has pin No. 2, and pin No. 7 of the processing chip 40 can output a stable voltage. As shown in FIG. 4, one end of the resistor R3 is electrically connected to pin No. 7 of the processing chip 40 through a node P7. The node of the resistor R3 electrically connected with the resistor R10 is electrically connected with pin No. 2 of the processing chip 40 through a node P1. The resistor R3 and the resistor R10 are shunt resistors, and the resistances of the resistor R3 and the resistor R10 are different from each other, so that the signals finally flow to the pins 402 of the processing chip. In this embodiment, the resistance of the resistor R3 is 20K Ω, and the resistance of the resistor R10 is 5.1K Ω. The maximum current control circuit 520 generates a maximum current value corresponding to the resistance values of the resistor R3 and the resistor R10, and sends the maximum current value to the processing chip 40.

It is understood that, in the present embodiment, the processing chip 40 can control the current value of the coil driving circuit 20 to be equal to or greater than the minimum current value and equal to or less than the maximum current value through the minimum current value and the maximum current value returned by the minimum current control circuit 510 and the maximum current control circuit 520, respectively. The phenomenon that the coil transmitting end 10 cannot be driven to generate charging current for the coil receiving end 2 due to the fact that the current value of the coil driving circuit 20 is too small is avoided. Meanwhile, the damage to the coil transmitting terminal 10 and the coil receiving terminal 2 caused by the overlarge current value of the coil driving circuit 20 is avoided.

In a possible embodiment, please refer to fig. 5 together, and fig. 5 is a schematic diagram of a wireless charging device for an electric toothbrush according to a second embodiment of the present application. The wireless charging device 1 for the electric toothbrush further comprises a power control circuit 60, and the processing chip 40 adjusts the frequency, the width and the duty ratio of an electric signal sent by the processing chip 40 to the coil driving circuit 20 according to the power control circuit 60, so as to control the power of the coil driving circuit 20.

It can be understood that, in this embodiment, the processing chip 40 can control the power of the coil driving circuit 20, so as to avoid damage to the coil transmitting terminal 10 and the coil receiving terminal 2 caused by excessive power, and reduce the potential safety hazard.

Specifically, in one possible implementation, please refer to fig. 6 together, and fig. 6 is a schematic diagram of a power control circuit according to a second implementation of the present application. The power control circuit 60 includes a resistor R4 and a resistor R11, one end of the resistor R4 is electrically connected to the power supply 310, the other end of the resistor R4 is electrically connected to one end of the resistor R11, a node at which the resistor R4 is electrically connected to the resistor R11 is electrically connected to the processing chip 40, and the other end of the resistor R11 is electrically connected to the processing chip 40.

Specifically, the processing chip 40 has pin No. 8 and pin No. 11. As shown in FIG. 6, the node at which the resistor R4 and the resistor R11 are electrically connected is electrically connected to pin No. 8 of the processing chip 40 through the node P8, and the other end of the resistor R11 is electrically connected to pin No. 11 of the processing chip 40 through the node P11. The No. 8 pin and the No. 11 pin of the processing chip 40 are the input signal and the output signal of the power control circuit 60, respectively. The processing chip 40 controls the power of the coil driving circuit 20 by changing the frequency, width and duty ratio of the electrical signal transmitted to the coil driving circuit 20 according to the input signal. For example, when the power of the coil driving circuit 20 needs to be increased, the frequency of the electric signal transmitted from the processing chip 40 to the coil driving circuit 20 is increased, the width and the duty ratio are increased, and the power for controlling the coil driving circuit 20 is increased.

In a possible embodiment, please refer to fig. 7 together, and fig. 7 is a schematic diagram of a wireless charging device for an electric toothbrush according to a third embodiment of the present disclosure. The wireless charging device 1 for the electric toothbrush further comprises a state display driving circuit 70 and a display circuit 80, the processing chip 40 obtains the current state of the wireless charging device 1 for the electric toothbrush and sends an electric signal to the state display driving circuit 70, and the state display driving circuit 70 is used for driving the display circuit 80 to display the current state of the wireless charging device 1 for the electric toothbrush, wherein the state comprises standby, charging and closing.

Specifically, in the present embodiment, the display circuit 80 is an LED display circuit. When the wireless charging device 1 for the electric toothbrush is in a standby state, the state display driving circuit 70 sends an electric signal to control the display circuit 80 to be normally on. When the wireless charging device 1 for the electric toothbrush is in a charging state, the state display driving circuit 70 sends an electric signal, and controls the display circuit 80 to be gradually turned on from off to maximum brightness and then slowly turned off from the maximum brightness by changing the width and the duty ratio of the electric signal, and the process is repeated. When the wireless charging device 1 for the electric toothbrush is in the off state, the state display driving circuit 70 sends an electric signal to control the display circuit 80 to be turned off.

It can be understood that, in this embodiment, the display circuit 80 can intuitively display the state of the wireless charging device 1 for electric toothbrush, and when the state of the wireless charging device 1 for electric toothbrush is changed, the state of the wireless charging device 1 for electric toothbrush can be grasped at the first time, so that the operability of the wireless charging device 1 for electric toothbrush is increased.

Specifically, referring to fig. 8, fig. 8 is a schematic diagram of a state display driving circuit according to a third embodiment of the present application. The state display driving circuit 70 includes: a resistor R8 and a resistor R17, wherein one end of the resistor R8 is electrically connected to the processing chip 40, the other end of the resistor R8 is electrically connected to the resistor R17, the other end of the resistor R17 is grounded, and a node at which the resistor R8 is electrically connected to the resistor R17 serves as a node at which the state display driving circuit 70 is electrically connected to the display circuit 80.

Specifically, in this embodiment, the processing chip 40 has pin No. 6. One end of the resistor R8 is electrically connected to pin No. 6 of the processing chip 40 through a node P6. The node at which the resistor R8 is electrically connected to the resistor R17 is electrically connected to the display circuit 80 via the node S. The resistor R8 and the resistor R17 are shunt resistors.

In a possible embodiment, please refer to fig. 9 together, and fig. 9 is a schematic diagram of a wireless charging device for an electric toothbrush according to a fourth embodiment of the present disclosure. The wireless charging device 1 for the electric toothbrush further comprises a current detection circuit 90, wherein the current detection circuit 90 is used for detecting the current of the coil transmitting terminal 10, and when the current value detected by the current detection circuit 90 is greater than a preset threshold value, the processing chip 40 closes the coil driving circuit 20.

It can be understood that, in the present embodiment, when the wireless charging device 1 for the electric toothbrush fails, the processing chip 40 cannot control the current value of the coil driving circuit 20 to be smaller than the maximum current value through the maximum current control circuit 520, which is likely to cause a safety hazard. The current detection circuit 90 can detect the current of the coil driving circuit 20, and when the current value detected by the current detection circuit 90 is greater than a preset threshold value, the processing chip 40 closes the coil driving circuit 20, so that the potential safety hazard of the electric toothbrush in use is reduced.

Specifically, in a possible implementation manner, please refer to fig. 10 together, and fig. 10 is a schematic diagram of a current detection circuit according to a fourth implementation manner of the present application. The current detection circuit 90 includes: the circuit comprises a capacitor C4, a capacitor C8, a resistor R5 and a resistor R7, wherein one end of the resistor R5 is electrically connected with the capacitor C8, a node at which the resistor R5 is electrically connected with the capacitor C8 is electrically connected with the processing chip 40, the other end of the capacitor C8 is grounded, the other end of the resistor R5 is electrically connected with one end of the resistor R7 and one end of the capacitor C4, a node at which the resistor R5 is electrically connected with the resistor R7 is electrically connected with the processing chip 40, and the other ends of the capacitor C4 and the resistor R7 are grounded.

Specifically, in this embodiment, the processing chip 40 has a pin No. 16, and the pin No. 16 of the processing chip 40 has a function of detecting a current. The node of the resistor R5 electrically connected with the capacitor C8 is electrically connected with the No. 16 pin of the processing chip 40 through a node P16. The node of the resistor R5 electrically connected with the resistor R7 is electrically connected with pin No. 13 of the processing chip 40 through a node P13. The capacitor C4, the capacitor C8, the resistor R5, and the resistor R7 form a clamp circuit, which provides a stable voltage value for the No. 16 pin of the processing chip 40.

In a possible implementation manner, please refer to fig. 11, and fig. 11 is a schematic diagram of a power supply circuit according to an implementation manner of the present application. The power supply circuit 30 further includes: one ends of the capacitor C9, the capacitor C10, the capacitor C9 and the capacitor C10 are electrically connected with the processing chip 40 and the power supply 310, and the other ends of the capacitor C9 and the capacitor C10 are grounded.

Specifically, the processing chip 40 has pin number 9. As shown in fig. 11, one end of each of the capacitor C9 and the capacitor C10 is electrically connected to pin No. 9 of the processing chip 40 through a node P9, so as to supply power to the processing chip 40. The capacitor C9 and the capacitor C10 are energy storage capacitors of the power supply 310.

In one possible implementation, please refer to fig. 12, in which fig. 12 is a schematic diagram of a processing chip according to an embodiment of the present disclosure. As shown in fig. 12, the processing chip 40 has 16 pins, which correspond to pin No. 1, pin No. 2, pin No. 3, pin No. 4, pin No. 5, pin No. 6, pin No. 7, pin No. 8, pin No. 9, pin No. 10, pin No. 11, pin No. 12, pin No. 13, pin No. 14, pin No. 15, and pin No. 16, respectively.

The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A wireless charging device for an electric toothbrush having a coil receiving end for charging the electric toothbrush, the wireless charging device comprising: coil transmitting terminal, coil drive circuit, power supply circuit, processing chip and current control circuit, the coil transmitting terminal with the coil drive circuit electricity is connected, power supply circuit includes power supply, power supply with the coil drive circuit electricity is connected, just the coil drive circuit still with the processing chip electricity is connected, works as when the coil transmitting terminal corresponds the coil receiving terminal of electric toothbrush and places, processing chip control the coil drive circuit does the coil transmitting terminal provides the electric energy, processing chip still is used for passing through current control circuit control passes through coil drive circuit's electric current size.

2. The wireless charging device for electric toothbrush according to claim 1, wherein the coil driving circuit comprises a schottky diode (D1), a capacitor (C5), a capacitor (C6), and a capacitor (C7), wherein one end of the capacitor (C5), the capacitor (C6), and the capacitor (C7) is electrically connected to the coil emitting end and the power supply, the other end of the capacitor (C5) and the capacitor (C6) is electrically connected to the other end of the coil emitting end and to the processing chip and the cathode of the schottky diode (D1), the anode of the schottky diode (D1) is electrically connected to the processing chip, and the other end of the capacitor (C7) is grounded.

3. The wireless charging device for an electric toothbrush according to claim 1, wherein the current control circuit comprises: a minimum current control circuit and a maximum current control circuit, wherein the minimum current control circuit is configured to send a minimum current value to the processing chip, the maximum current control circuit is configured to send a maximum current value to the processing chip, the processing chip controls a current value of the coil driving circuit to be greater than or equal to the minimum current value and less than or equal to the maximum current value, and the minimum current control circuit includes: a resistor (R2) and a resistor (R9), wherein one end of the resistor (R2) is electrically connected with the processing chip, the other end of the resistor (R2) is electrically connected with one end of the resistor (R9), a node of the resistor (R2) which is electrically connected with the resistor (R9) is electrically connected with the processing chip, and the other end of the resistor (R9) is grounded; the maximum current control circuit includes: the processing chip comprises a resistor (R3) and a resistor (R10), one end of the resistor (R3) is electrically connected with the processing chip, the other end of the resistor (R3) is electrically connected with one end of the resistor (R10), a node of the resistor (R3) which is electrically connected with the resistor (R10) is electrically connected with the processing chip, and the other end of the resistor (R10) is grounded.

4. The wireless charging device for electric toothbrushes according to claim 1, further comprising a power control circuit, wherein the processing chip adjusts the frequency, the width and the duty ratio of the electric signal sent by the processing chip to the coil driving circuit according to the power control circuit, so as to control the power of the coil driving circuit.

5. The wireless charging device for electric toothbrushes according to claim 4, wherein the power control circuit comprises a resistor (R4) and a resistor (R11), one end of the resistor (R4) is electrically connected to the power supply, the other end of the resistor (R4) is electrically connected to one end of the resistor (R11), a node at which the resistor (R4) is electrically connected to the resistor (R11) is electrically connected to the processing chip, and the other end of the resistor (R11) is electrically connected to the processing chip.

6. The wireless charging device for the electric toothbrush according to claim 1, further comprising a status display driving circuit and a display circuit, wherein the processing chip obtains a current status of the wireless charging device for the electric toothbrush and sends an electrical signal to the status display driving circuit, and the status display driving circuit is configured to drive the display circuit to display the current status of the wireless charging device for the electric toothbrush, wherein the status includes standby, charging and shutdown.

7. The wireless charging device for an electric toothbrush according to claim 6, wherein the status display driving circuit comprises: the display device comprises a resistor (R8) and a resistor (R17), wherein one end of the resistor (R8) is electrically connected with the processing chip, the other end of the resistor (R8) is electrically connected with the resistor (R17), the other end of the resistor (R17) is grounded, and a node, electrically connected with the resistor (R8) and the resistor (R17), of the resistor (R8) serves as a node of the state display driving circuit which is electrically connected with the display circuit.

8. The wireless charging device for electric toothbrushes according to claim 1, further comprising a current detection circuit for detecting the magnitude of the current at the transmitting end of the coil, wherein the processing chip turns off the coil driving circuit when the current value detected by the current detection circuit is greater than a preset threshold value.

9. The wireless charging device for an electric toothbrush according to claim 8, wherein the current detection circuit comprises: the processing chip comprises a capacitor (C4), a capacitor (C8), a resistor (R5) and a resistor (R7), wherein one end of the resistor (R5) is electrically connected with the capacitor (C8), a node, electrically connected with the capacitor (C8), of the resistor (R5) is electrically connected with the processing chip, the other end of the capacitor (C8) is grounded, the other end of the resistor (R5) is electrically connected with one end of the resistor (R7) and one end of the capacitor (C4), a node, electrically connected with the resistor (R5) and the resistor (R7), of the resistor (R5) is electrically connected with the processing chip, and the other ends of the capacitor (C4) and the resistor (R7) are.

10. The wireless charging device for an electric toothbrush according to claim 1, wherein the power supply circuit further comprises: the processing chip comprises a capacitor (C9) and a capacitor (C10), wherein one end of the capacitor (C9) and one end of the capacitor (C10) are electrically connected with the processing chip and the power supply, and the other ends of the capacitor (C9) and the capacitor (C10) are grounded.

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