CN220325274U - Beauty instrument - Google Patents

Abstract

The application provides a beauty instrument, the beauty instrument includes functional module, voltage input, voltage output, overvoltage protection circuit and overcurrent protection circuit. The voltage input terminal is used for receiving a power supply voltage. The voltage output terminal is used for outputting the working voltage obtained by the power supply voltage to the functional component. The overvoltage protection circuit and the overcurrent protection circuit are connected in series between the voltage input end and the voltage output end. And when the power supply voltage received by the voltage input end is higher than a preset voltage threshold value, the overvoltage protection circuit breaks the electrical connection between the voltage input end and the voltage output end, so that the voltage output end stops outputting the working voltage. And when the power supply current output by the voltage input end to the voltage output end is higher than a preset current threshold value, the overcurrent protection circuit breaks the electrical connection between the voltage input end and the voltage output end, so that the voltage output end stops outputting the working voltage. The cosmetic instrument can prevent the functional components from being damaged by excessive current or excessive voltage, and can prolong the service life.

Description

Beauty instrument

Technical Field

The application relates to the technical field of beauty treatment instruments, in particular to a beauty treatment instrument.

Background

The beauty instrument can realize the functional output of micro power supply current (alternating current), radio frequency (high-frequency alternating current changing electromagnetic wave) and the like for a user and other components through boosting the power supply and/or converting the electric energy, such as: the display screen, the main control, the heating circuit, the led lamp, etc. provide the required voltage, however, when the input voltage or the input current is too high, the electronic components are damaged, so that it is needed to provide a cosmetic instrument with higher safety.

Disclosure of Invention

In view of this, the main objective of the present application is to provide a cosmetic instrument, which aims to solve the problem of lower safety of the existing cosmetic instrument.

To achieve the above object, the present application provides a cosmetic instrument including a functional component, a voltage input terminal, a voltage output terminal, an overvoltage protection circuit, and an overcurrent protection circuit. The voltage input terminal is used for receiving a power supply voltage. The voltage output end is electrically connected with the functional component and is used for outputting working voltage obtained by the power supply voltage to the functional component. The overvoltage protection circuit and the overcurrent protection circuit are connected in series between the voltage input terminal and the voltage output terminal. And the overvoltage protection circuit breaks the electrical connection between the voltage input end and the voltage output end when the power supply voltage received by the voltage input end is higher than a preset voltage threshold value, so that the voltage output end stops outputting the working voltage. And when the power supply current output by the voltage input end to the voltage output end is higher than a preset current threshold value, the overcurrent protection circuit breaks the electric connection between the voltage input end and the voltage output end, so that the voltage output end stops outputting the working voltage.

The cosmetic instrument provided by the application is provided with the overvoltage protection circuit and the overcurrent protection circuit, and when the power supply voltage received by the voltage input end is higher than a preset voltage threshold value, the overvoltage protection circuit is used for disconnecting the electric connection between the voltage input end and the voltage output end, and when the power supply current output by the voltage input end to the voltage output end is higher than the preset current threshold value, the overcurrent protection circuit is used for disconnecting the electric connection between the voltage input end and the voltage output end, so that the overlarge current or overlarge voltage can be prevented from damaging a functional component, and the service life can be effectively prolonged.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

Fig. 1 is a schematic structural diagram of a cosmetic apparatus according to an embodiment of the present application;

fig. 2 is a first circuit configuration diagram of the cosmetic instrument shown in fig. 1;

fig. 3 is a second circuit configuration diagram of the cosmetic instrument shown in fig. 1.

The reference numerals are explained as follows:

beauty instrument 100

Voltage input terminal 10

Overvoltage protection circuit 20

Overcurrent protection circuit 30

Voltage output terminal 40

Functional component 50

Controller 60

First switching element Q1

Second switching element Q2

Third switching element Q3

Overvoltage control sub-circuit 21

Reference voltage generating circuit 211

Connection node 2111

Comparator U2

Overcurrent protection chip U1

Input pin IN

Output pin OUT

Enable signal pin CTRL

Current threshold setting pin ILIM

First resistor R1

Second resistor R2

Third resistor R3

Fourth resistor R4

Fifth resistor R5

Sixth resistor R6

Seventh resistor R7

Eighth resistor R8

Ninth resistor R9

Current threshold setting resistor Rset

Voltage stabilizing diode D1

Filter inductor L1

Voltage stabilizing source VCC

The following detailed description will further illustrate the application in conjunction with the above-described figures.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without undue burden, are within the scope of the present application.

Furthermore, the terms "first," "second," and the like in the description of the present utility model, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that, without conflict, features in embodiments of the present application may be combined with each other.

Referring to fig. 1, the present application provides a cosmetic apparatus 100, where the cosmetic apparatus 100 includes a voltage input terminal 10, an overvoltage protection circuit 20, an overcurrent protection circuit 30, a voltage output terminal 40, and a functional component 50.

Wherein the voltage input terminal 10 is used for receiving a power supply voltage.

The voltage output terminal 40 is electrically connected to the functional module 50, and is configured to output an operating voltage obtained from the power supply voltage to the functional module 50.

The overvoltage protection circuit 20 and the overcurrent protection circuit 30 are connected in series between the voltage input 10 and the voltage output 40. The overvoltage protection circuit 20 disconnects the electrical connection between the voltage input terminal 10 and the voltage output terminal 40 when the power supply voltage received by the voltage input terminal 10 is higher than a preset voltage threshold value, so that the voltage output terminal 40 stops outputting the operating voltage. The over-current protection circuit 30 disconnects the electrical connection between the voltage input terminal 10 and the voltage output terminal 40 when the supply current output from the voltage input terminal 10 to the voltage output terminal 40 is higher than a preset current threshold value, so that the voltage output terminal 40 stops outputting the operating voltage.

The cosmetic instrument 100 provided by the application, through setting up overvoltage protection circuit 20 and overcurrent protection circuit 30, and when the power voltage received by voltage input terminal 10 is higher than the preset voltage threshold value, through overvoltage protection circuit 20 disconnection voltage input terminal 10 with the electric connection between voltage output terminal 40, and when voltage input terminal 10 to the power supply current of voltage output terminal 40 output is higher than the preset current threshold value, through overcurrent protection circuit 30 disconnection voltage input terminal 10 with the electric connection between voltage output terminal 40 can prevent too big electric current or too big voltage damage functional module 50, can prolong life effectively.

Alternatively, the voltage input terminal 10 is configured to be connected to a battery or a USB interface, and is configured to receive direct current provided by the battery or direct current provided by the USB interface connected to a power adapter or the like. In some embodiments, the voltage input 10 may be directly the output circuit of the battery or the output circuit of the USB interface.

Illustratively, the functional component 50 includes elements for performing a cosmetic function in the cosmetic instrument 100 and driving circuits thereof, and may include, for example, but not limited to, at least one of a heating element, an ultrasonic generating circuit, an ac generating circuit, and an LED indicating circuit.

In this embodiment, the overvoltage protection circuit 20 is electrically connected between the voltage input terminal 10 and the overcurrent protection circuit 30, the overcurrent protection circuit 30 is electrically connected between the overvoltage protection circuit 20 and the voltage output terminal 40, the working voltage output by the voltage output terminal 40 is equal to the power voltage received by the voltage input terminal 10, the overvoltage protection circuit 20 and the overcurrent protection circuit 30 do not perform voltage conversion on the power voltage but directly output the power voltage through the voltage output terminal 40, that is, the voltage power received from the voltage input terminal 10 is directly output to the overcurrent protection circuit 30 when the overvoltage protection circuit 20 is turned on, and further, the voltage power is directly output to the voltage output terminal 40 when the overcurrent protection circuit 30 is also turned on, so that the voltage output terminal 40 cannot output the working voltage when the overvoltage protection circuit 20 and/or the overcurrent protection circuit 30 is turned off. Of course, in another embodiment, the over-current protection circuit 30 may be electrically connected between the voltage input terminal 10 and the over-voltage protection circuit 20, and the over-voltage protection circuit 20 may be electrically connected between the over-current protection circuit 30 and the voltage output terminal 40. In still another embodiment, the working voltage output by the voltage output terminal 40 may not be equal to the power supply voltage received by the voltage input terminal 10, and in this case, the overvoltage protection circuit 20 and/or the overcurrent protection circuit 30 may perform voltage conversion (for example, voltage boosting or voltage reducing) on the power supply voltage received by the voltage input terminal 10 to obtain the working voltage, or the beauty apparatus 100 further includes a voltage conversion circuit (for example, voltage boosting circuit, voltage reducing circuit or voltage boosting/reducing circuit) connected in series between the voltage input terminal 10 and the voltage output terminal 40.

Further, referring to fig. 2, the overvoltage protection circuit 20 includes a first switching element Q1 and an overvoltage control sub-circuit 21.

The first switching element Q1 includes a first connection end, a second connection end, and a control end, the first connection end of the first switching element Q1 is electrically connected to the voltage input end 10, and the second connection end of the first switching element Q1 is electrically connected to the overcurrent protection circuit 30.

The overvoltage control sub-circuit 21 is electrically connected to the voltage input terminal 10 and the control terminal of the first switching element Q1, respectively, and the overvoltage control sub-circuit 21 outputs a first on signal to the control terminal of the first switching element Q1 when the power supply voltage received by the voltage input terminal 10 is lower than or equal to the preset voltage threshold value, so that the overvoltage protection circuit 20 conducts the electrical connection between the voltage input terminal 10 and the overcurrent protection circuit 30, and outputs a first off signal to the control terminal of the first switching element Q1 when the power supply voltage received by the voltage input terminal 10 is higher than the preset voltage threshold value, so that the overvoltage protection circuit 20 breaks the electrical connection between the voltage input terminal 10 and the overcurrent protection circuit 30.

The first switching element Q1 is illustratively a field effect transistor or a triode. In this embodiment of the present application, the first switching element Q1 is a PMOS transistor, and a source, a drain, and a gate of the PMOS transistor are in one-to-one correspondence with a first connection end, a second connection end, and a control end of the first switching element Q1.

Further, the overvoltage control sub-circuit 21 includes a first resistor R1, a second switching element Q2, a zener diode D1, a second resistor R2, a third resistor R3, and a fourth resistor R4.

The first resistor R1 includes a first end and a second end, the first end of the first resistor R1 is electrically connected with the voltage input end 10, and the second end of the first resistor R1 is electrically connected with the source of the PMOS transistor.

The second switching element Q2 includes a first connection end, a second connection end, and a control end, where the first connection end of the second switching element Q2 is electrically connected to the second end of the first resistor R1. The second switching element Q2 is a switching element turned on at a low level.

The zener diode D1 includes an anode and a cathode, and the cathode of the zener diode D1 is electrically connected to the control terminal of the second switching element Q2.

The second resistor R2 is electrically connected between the anode of the zener diode D1 and ground.

The third resistor R3 is electrically connected between the second connection end of the second switching element Q2 and the gate of the PMOS transistor.

The fourth resistor R4 is electrically connected between the second connection terminal of the second switching element Q2 and ground.

When the power supply voltage received by the voltage input terminal 10 is lower than or equal to the preset voltage threshold, the zener diode D1 plays a role of blocking the current from the control terminal of the second switching element Q2 to the second resistor R2, and at this time, the control terminal of the second switching element Q2 and the second resistor R2 are disconnected. Therefore, the control terminal of the second switching element Q2 is at a high level, so that the second switching element Q2 maintains an off state. When the power supply voltage received by the voltage input terminal 10 is higher than the preset voltage threshold, the power supply voltage discharges to the ground through the first resistor R1, the first connection terminal of the second switching element Q2, the control terminal of the second switching element Q2, the zener diode D1 and the second resistor R2, and the zener diode D1 is reversely broken down due to the excessively high voltage difference between the cathode and the anode, at this time, the control terminal of the second switching element Q2 is equivalent to that the control terminal of the second switching element Q2 is in short circuit with the ground through the zener diode D1 and the second resistor R2 which are reversely broken down, that is, the control terminal of the second switching element Q2 is at the ground potential, so that the second switching element Q2 is turned on.

Specifically, when the power supply voltage received by the voltage input terminal 10 is lower than or equal to the preset voltage threshold during operation, the second switching element Q2 is turned off, and the gate of the PMOS transistor is grounded through the third resistor R3 and the fourth resistor R4, that is, the overvoltage control sub-circuit 21 outputs the first conduction signal to the gate of the PMOS transistor, so that the PMOS transistor conducts the electrical connection between the voltage input terminal 10 and the overcurrent protection circuit 30.

When the power supply voltage received by the voltage input terminal 10 is higher than the preset voltage threshold, the zener diode D1 is reversely broken down, so that the second switching element Q2 is turned on due to the control terminal being grounded through the zener diode D1 and the second resistor R2 which are reversely broken down, and the gate of the PMOS transistor receives the power supply voltage through the third resistor R3, the turned-on second switching element Q2 and the first resistor R1, that is, the overvoltage control sub-circuit 21 outputs the first disconnection signal to the gate of the PMOS transistor, so that the PMOS transistor disconnects the electrical connection between the voltage input terminal 10 and the overcurrent protection circuit 30. The first on signal is a low level signal, and the first off signal is a high level signal.

In this way, the hardware circuit composed of the first resistor R1, the second switching element Q2, the zener diode D1, the second resistor R2, the third resistor R3 and the fourth resistor R4 can control the first switching element Q1 to be reliably turned off when the power supply voltage is higher than the preset voltage threshold, and the software control algorithm is not involved, so that the reliability is high.

The second switching element Q2 is a field effect transistor or a triode, and in this embodiment, the second switching element Q2 is a PNP type triode, and an emitter, a collector, and a base of the PNP type triode are in one-to-one correspondence with a first connection end, a second connection end, and a control end of the second switching element Q2.

Further, the overcurrent protection circuit 30 includes an overcurrent protection chip U1, the overcurrent protection chip U1 includes an input pin IN, an output pin OUT and a current threshold setting pin ILIM, the input pin IN of the overcurrent protection chip U1 is electrically connected with the overvoltage protection circuit 20, the output pin OUT of the overcurrent protection chip U1 is electrically connected with the voltage output terminal 40, and the current threshold setting pin ILIM of the overcurrent protection chip U1 is electrically connected with a current threshold setting resistor Rset. The overcurrent protection chip U1 may output the operating voltage to the voltage output terminal 40 through the output pin OUT based on the power supply voltage received from the input pin IN. The over-current protection chip U1 is further configured to determine the preset current threshold according to a resistance value of a current threshold setting resistor Rset connected to the current threshold setting pin ILIM, detect a supply current output from the voltage input terminal 10 to the voltage output terminal 40, and disconnect the electrical connection between the input pin IN and the output pin OUT when the supply current is higher than the preset current threshold, so as to stop outputting the working voltage, and further stop outputting the working voltage by the voltage output terminal 40.

Therefore, the preset current threshold can be changed by changing the resistance value of the current threshold setting resistor Rset, so that engineers can conveniently select different preset current thresholds according to requirements.

Further, the overcurrent protection chip U1 further includes an enable signal pin CTRL. The beauty apparatus 100 further includes a controller 60, where the controller 60 is electrically connected to the enable signal pin CTRL of the over-current protection chip U1, and the controller 60 is configured to output an enable signal to the enable signal pin CTRL of the over-current protection chip U1 to enable the over-current protection chip U1, or output a disable signal to the enable signal pin CTRL of the over-current protection chip U1 to disable the over-current protection chip U1. It is to be understood that the overcurrent protection chip U1 operates and outputs the operating voltage only when enabled, and stops operating and outputting the operating voltage when disabled.

In this embodiment of the present application, the over-current protection circuit 30 further includes a fifth resistor R5 and a sixth resistor R6, where the fifth resistor R5 is electrically connected between the enable signal pin CTRL of the over-current protection chip U1 and the controller 60, and the sixth resistor R6 is electrically connected between the enable signal pin CTRL of the over-current protection chip U1 and ground. The enable signal is a high level signal and the disable signal is a low level signal.

The controller 60 may be, for example, a single chip microcomputer, a central processing circuit (Central Processing Unit, CPU), other general purpose processing circuits, digital signal processing circuits (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like.

Further, the beauty apparatus 100 further includes a third switching element Q3, where the third switching element Q3 includes a first connection end, a second connection end, and a control end, the first connection end of the third switching element Q3 is electrically connected to the input pin IN of the overcurrent protection chip U1, the second connection end of the third switching element Q3 is electrically connected to the output pin OUT of the overcurrent protection chip U1, and the control end of the third switching element Q3 is electrically connected to the controller.

The operation modes of the beauty instrument 100 include a small current protection mode and a large current direct supply mode. The beauty apparatus 100 operates in the low current protection mode when the overcurrent protection chip U1 is enabled under the control of the controller and the third switching element Q3 is turned off under the control of the controller. When the overcurrent protection chip U1 is disabled under the control of the controller and the third switching element Q3 is turned on under the control of the controller, the beauty apparatus 100 operates in the high-current direct supply mode.

Optionally, the beauty treatment instrument 100 may further include an operation mode setting circuit (not shown) electrically connected to the controller 60, and the operation mode setting circuit is configured to receive an operation mode setting instruction input by a user and output the operation mode setting instruction to the controller 60. Specifically, the operation mode setting instruction may include a first mode instruction and a second mode instruction. The controller 60 enables the overcurrent protection chip U1 and controls the third switching element Q3 to be turned off in response to the first mode instruction, so that the beauty apparatus 100 enters a small current protection mode, disables the overcurrent protection chip U1 and controls the third switching element Q3 to be turned on in response to the second mode instruction, so that the beauty apparatus 100 enters a large current direct supply mode.

In this way, when the functional component 50 needs a large current, the over-current protection chip U1 may be disabled and the third switching element Q3 may be controlled to be turned on, so that the voltage input terminal 10 may output the power supply voltage to the voltage output terminal 40 through the turned-on first switching element Q1 and the turned-on third switching element Q3, thereby preventing the over-current protection chip U1 from malfunction.

The third switching element Q3 is illustratively a field effect transistor or a triode. In this embodiment of the present application, the third switching element Q3 is a PMOS transistor.

Further, the beauty apparatus 100 further includes a filter inductor L1 electrically connected between the output pin OUT of the overcurrent protection chip U1 and the voltage output terminal 40, where the filter inductor L1 is configured to filter ac components in the supply current output by the output terminal of the overcurrent protection chip U1.

Referring to fig. 3, the present application further provides another cosmetic apparatus 100, and the cosmetic apparatus 100 shown in fig. 3 is similar to the circuit structure and the working principle of the cosmetic apparatus 100 shown in fig. 2, and only the circuit structure of the overvoltage control sub-circuit 21 is different.

Specifically, in the present embodiment, the overvoltage control sub-circuit 21 includes a reference voltage generating circuit 211 and a comparator U2.

Wherein the reference voltage generating circuit 211 is configured to generate a reference voltage having a voltage value equal to the preset voltage threshold.

The comparator U2 includes a non-inverting input, an inverting input, and an output. The non-inverting input end of the comparator U2 is electrically connected to the voltage input end 10, the inverting input end of the comparator U2 is electrically connected to the reference voltage generating circuit 211, and the output end of the comparator U2 is electrically connected to the gate of the PMOS transistor. The comparator U2 outputs the first on signal when the voltage of the non-inverting input terminal is lower than or equal to the voltage of the inverting input terminal, and outputs the first off signal when the voltage of the non-inverting input terminal is higher than the voltage of the inverting input terminal. The first on signal is a low level signal, and the first off signal is a high level signal.

Further, the overvoltage control subcircuit 21 further includes a seventh resistor R7 electrically connected between the non-inverting input of the comparator U2 and the voltage input 10.

The reference voltage generating circuit 211 includes an eighth resistor R8 and a ninth resistor R9 connected in series between a voltage stabilizing source VCC and ground, and a connection node 2111 between the eighth resistor R8 and the ninth resistor R9 is electrically connected to an inverting input terminal of the comparator U2. The eighth resistor R8 and the ninth resistor R9 are configured to divide the working voltage VCC to obtain a reference voltage with a voltage value equal to the preset voltage threshold, and output the reference voltage to the inverting input terminal of the comparator U2 through the connection node 2111. Wherein, the voltage value V2111 of the reference voltage is related to the ratio of the impedance value of the eighth resistor R8 and the impedance value of the ninth resistor R9. The voltage provided by the regulated power supply VCC is constant, for example, 12V.

As can be seen from the voltage division principle, the preset voltage threshold, that is, the voltage value v2111=vcc×r9/(r8+r9) of the reference voltage generated by the reference voltage generating circuit 211.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A cosmetic device, comprising:

a functional component;

a voltage input for receiving a power supply voltage;

the voltage output end is electrically connected with the functional component and is used for outputting working voltage obtained by the power supply voltage to the functional component; and

the overvoltage protection circuit and the overcurrent protection circuit are connected in series between the voltage input end and the voltage output end; the overvoltage protection circuit breaks the electrical connection between the voltage input end and the voltage output end when the power supply voltage received by the voltage input end is higher than a preset voltage threshold value, so that the voltage output end stops outputting the working voltage; and when the power supply current output by the voltage input end to the voltage output end is higher than a preset current threshold value, the overcurrent protection circuit breaks the electric connection between the voltage input end and the voltage output end, so that the voltage output end stops outputting the working voltage.

2. The cosmetic apparatus of claim 1, wherein the overvoltage protection circuit comprises:

the first switching element comprises a first connecting end, a second connecting end and a control end, wherein the first connecting end of the first switching element is electrically connected with the voltage input end, and the second connecting end of the first switching element is electrically connected with the overcurrent protection circuit; and

the overvoltage control sub-circuit is electrically connected with the voltage input end and the control end of the first switching element respectively, and outputs a first conduction signal to the control end of the first switching element when the power supply voltage received by the voltage input end is lower than or equal to the preset voltage threshold value, so that the overvoltage protection circuit conducts the electrical connection between the voltage input end and the overcurrent protection circuit, and outputs a first disconnection signal to the control end of the first switching element when the power supply voltage received by the voltage input end is higher than the preset voltage threshold value, so that the overvoltage protection circuit disconnects the electrical connection between the voltage input end and the overcurrent protection circuit.

3. The cosmetic apparatus of claim 2, wherein the first switching element is a PMOS transistor, and the source, the drain, and the gate of the PMOS transistor are in one-to-one correspondence with the first connection terminal, the second connection terminal, and the control terminal of the first switching element.

4. A cosmetic apparatus according to claim 3, wherein the overvoltage control sub-circuit comprises:

the first resistor comprises a first end and a second end, the first end of the first resistor is electrically connected with the voltage input end, and the second end of the first resistor is electrically connected with the source electrode of the PMOS tube;

the second switching element comprises a first connecting end, a second connecting end and a control end, wherein the first connecting end of the second switching element is electrically connected with the second end of the first resistor, and the second switching element is a low-level conducting switching element;

the voltage stabilizing diode comprises an anode and a cathode, and the cathode of the voltage stabilizing diode is electrically connected with the control end of the second switching element;

the second resistor is electrically connected between the anode of the voltage stabilizing diode and the ground;

the third resistor is electrically connected between the second connecting end of the second switching element and the grid electrode of the PMOS tube; and

a fourth resistor electrically connected between the second connection end of the second switching element and ground;

when the power supply voltage received by the voltage input end is lower than or equal to the preset voltage threshold value, the second switching element is disconnected, and the overvoltage control sub-circuit outputs the first conduction signal to the grid electrode of the PMOS tube, so that the PMOS tube conducts the electric connection between the voltage input end and the overcurrent protection circuit; when the power supply voltage received by the voltage input end is higher than the preset voltage threshold value, the zener diode is reversely broken down, so that the second switching element is conducted due to the fact that the control end is grounded through the zener diode which is reversely broken down and the second resistor, the overvoltage control sub-circuit outputs the first disconnection signal to the grid electrode of the PMOS tube, and the PMOS tube is further enabled to disconnect the electric connection between the voltage input end and the overcurrent protection circuit; the first on signal is a low level signal, and the first off signal is a high level signal.

5. The apparatus of claim 4, wherein the second switching element is a PNP transistor, and an emitter, a collector, and a base of the PNP transistor are in one-to-one correspondence with the first connection terminal, the second connection terminal, and the control terminal of the second switching element.

6. A cosmetic apparatus according to claim 3, wherein the overvoltage control sub-circuit comprises:

a reference voltage generating circuit for generating a reference voltage having a voltage value equal to the preset voltage threshold; and

the comparator comprises a normal phase input end, an opposite phase input end and an output end; the positive input end of the comparator is electrically connected with the voltage input end, the negative input end of the comparator is electrically connected with the reference voltage generating circuit, and the output end of the comparator is electrically connected with the grid electrode of the PMOS tube; the comparator outputs the first on signal when the voltage of the non-inverting input terminal is lower than or equal to the voltage of the inverting input terminal, and outputs the first off signal when the voltage of the non-inverting input terminal is higher than the voltage of the inverting input terminal; the first on signal is a low level signal, and the first off signal is a high level signal.

7. The cosmetic apparatus of claim 1, wherein the overcurrent protection circuit comprises an overcurrent protection chip, the overcurrent protection chip comprises an input pin, an output pin and a current threshold setting pin, the input pin of the overcurrent protection chip is electrically connected with the overvoltage protection circuit, the output pin of the overcurrent protection chip is electrically connected with the voltage output terminal, and the current threshold setting pin of the overcurrent protection chip is electrically connected with a current threshold setting resistor; the over-current protection chip can output the working voltage to the voltage output end through the output pin based on the power supply voltage received from the input pin; the overcurrent protection chip is further used for determining the preset current threshold according to the resistance value of the current threshold setting resistor connected to the current threshold setting pin, detecting the power supply current output by the voltage input end to the voltage output end, and disconnecting the electric connection between the input pin and the output pin when the power supply current is higher than the preset current threshold, so that the voltage output end stops outputting the working voltage.

8. The cosmetic apparatus of claim 7, wherein the overcurrent protection chip further comprises an enable signal pin; the beauty instrument further comprises a controller, wherein the controller is electrically connected with the enable signal pin of the overcurrent protection chip, and the controller is used for outputting an enable signal to the enable signal pin of the overcurrent protection chip so as to enable the overcurrent protection chip or outputting a disable signal to the enable signal pin of the overcurrent protection chip so as to disable the overcurrent protection chip.

9. The cosmetic apparatus of claim 8, further comprising a third switching element, the third switching element comprising a first connection terminal, a second connection terminal, and a control terminal, the first connection terminal of the third switching element being electrically connected to the input pin of the overcurrent protection chip, the second connection terminal of the third switching element being electrically connected to the output pin of the overcurrent protection chip, the control terminal of the third switching element being electrically connected to the controller;

the working modes of the beauty instrument comprise a small current protection mode and a large current direct supply mode; the cosmetic instrument works in the small current protection mode when the overcurrent protection chip is enabled under the control of the controller and the third switching element is disconnected under the control of the controller; and when the overcurrent protection chip is disabled under the control of the controller and the third switching element is conducted under the control of the controller, the beauty instrument works in the high-current direct supply mode.

10. The cosmetic apparatus of claim 7, further comprising a filter inductor electrically connected between the output pin of the overcurrent protection chip and the voltage output terminal, the filter inductor being configured to filter ac components in the supply current output by the output terminal of the overcurrent protection chip.