A power supply control circuit and a beauty instrument

Abstract

The application discloses a power supply control circuit and a beauty instrument. When a key is pressed, the key module outputs a first power supply control signal to the first power supply control module. When the system control chip is powered off, the first power supply control module disconnects the path between the battery and the second power supply control module, and after receiving the first power supply control signal, the first power supply control module is turned on, and the battery voltage is output to the second power supply control module and the key module. After receiving the battery voltage, the key module outputs a power-on / off control signal to the system control chip, so that the system control chip starts to output a second power supply control signal to the first power supply control module and a third power supply control signal to the second power supply control module. After receiving the second power supply control signal, the first power supply control module is continuously turned on after the key is released. After receiving the third power supply control signal, the second power supply control module outputs the system power supply voltage. The application can reduce the system static power consumption and realize one-key starting of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a power supply control circuit and a beauty instrument. BACKGROUND

[0002] At present, the simple structure of the terminal product with battery on the market is charging circuit-battery-boosting or step-down circuit-to-be-powered system. When the terminal product system is turned off, the battery is still connected to the to-be-powered system, and the to-be-powered system is still consuming the battery power, which increases the static power consumption, so that the user needs to charge again after placing for a period of time. However, if the connection between the to-be-powered system and the battery is completely disconnected when the to-be-powered system is turned off, the to-be-powered system cannot be restarted. SUMMARY

[0003] The present application provides a power supply control circuit and a beauty instrument to reduce the system static power consumption and realize one-key start of the system.

[0004] According to an aspect of the present application, a power supply control circuit is provided, comprising:

[0005] a first power supply control module, a second power supply control module and a key module;

[0006] The input end of the first power supply control module is electrically connected to the voltage output end of the battery, the output end is electrically connected to the power input end of the second power supply control module, the first control end is electrically connected to the first output end of the key module, and the second control end is electrically connected to the first control end of the system control chip.

[0007] The control end of the second power supply control module is electrically connected to the second control end of the system control chip, the first output end is electrically connected to the input end of the key module, and the second output end is electrically connected to the to-be-powered system.

[0008] The second output end of the key module is electrically connected to the power-on control end of the system control chip.

[0009] The key module comprises a key, and the key module is configured to output a first power supply control signal to the first power supply control module when the key is pressed.

[0010] The first power supply control module is configured to disconnect the communication path between the battery and the second power supply control module when the system control chip is turned off, and to connect the communication path between the battery and the second power supply control module after receiving the first power supply control signal, so that the battery voltage of the battery is output to the second power supply control module and the key module.

[0011] The key module is further configured to output a switch control signal to the system control chip after receiving the battery voltage, so that the system control chip outputs a second power supply control signal to the first power supply control module and a third power supply control signal to the second power supply control module;

[0012] The first power supply control module is further configured to keep the communication path between the battery and the second power supply control module on after the key is released after receiving the second power supply control signal.

[0013] The second power supply control module is configured to output a system power supply voltage to the system to be powered after receiving the third power supply control signal.

[0014] Optionally, the third control end of the first power supply control module and the power input end of the second power supply control module are both configured to receive an external power supply signal.

[0015] The first power supply control module is configured to disconnect the communication path between the battery and the second power supply control module and stop outputting the battery voltage to the second power supply control module when the third control end receives the external power supply signal.

[0016] Optionally, the first power supply control module includes a first switch unit, a second switch unit, a third switch unit, and a fourth switch unit.

[0017] The first end of the first switch unit is electrically connected to the voltage output end of the battery, the second end is electrically connected to the first end of the second switch unit, the third end is connected to the first control end of the second switch unit and then grounded, and the control end is electrically connected to the first end of the third switch unit and the first end of the fourth switch unit.

[0018] The second end of the second switch unit is electrically connected to the voltage input end of the second power supply control module, and the second control end is configured to receive an external power supply signal.

[0019] The second end of the third switch unit is grounded, and the control end is electrically connected to the first control end of the system control chip.

[0020] The control end of the fourth switch unit is electrically connected to the first output end of the key module.

[0021] The fourth switch unit is configured to turn on after receiving the first power supply control signal output by the key module, so that the potential of the control end of the first switch unit becomes a turn-on potential, the first switch unit is turned on, and the first end of the second switch unit and the voltage output end of the battery are connected.

[0022] The second switch unit is used for being turned on after the first switch unit is turned on, outputting the battery voltage of the battery to the second power supply control module, and being turned off when receiving an external source signal;

[0023] The third switch unit is used for being turned on after receiving a second power supply control signal sent by the system control chip, maintaining the potential of the control end of the first switch unit at a turn-on potential, and keeping the first switch unit turned on when the key is released.

[0024] Optionally, the second power supply control module comprises a first voltage dividing unit, a fifth switch unit and a sixth switch unit;

[0025] The first end of the first voltage dividing unit is electrically connected with the output end of the first power supply control module and the first end of the fifth switch unit, the second end is electrically connected with the input end of the key module, and the third end is electrically connected with the control end of the fifth switch unit and the first end of the sixth switch unit;

[0026] The second end of the sixth switch unit is grounded, and the control end is electrically connected with the second control end of the system control chip;

[0027] The sixth switch unit is used for being turned on after receiving a third power supply control signal output by the system control chip, changing the potential of the control end of the fifth switch unit to a turn-on potential, and turning on the fifth switch unit;

[0028] The fifth switch unit is used for outputting the system power supply voltage through the second end after being turned on.

[0029] Optionally, the key module comprises a second voltage dividing unit and a key;

[0030] The first end of the second voltage dividing unit is electrically connected with the first end of the key and the power-on control end of the system control chip, and the second end is connected with a preset potential;

[0031] The second end of the key is electrically connected with the first output end of the second power supply control unit.

[0032] Optionally, the first switch unit comprises a first transistor, a first resistor and a first capacitor;

[0033] The second switch unit comprises a second transistor, a second resistor and a third resistor;

[0034] The third switch unit comprises a first triode, a fourth resistor and a fifth resistor;

[0035] The fourth switch unit comprises a second triode, a sixth resistor and a first diode;

[0036] The first electrode of the first transistor is electrically connected with the first end of the first resistor and the voltage output end of the battery respectively, the second electrode is electrically connected with the first end of the first capacitor and the first electrode of the second transistor, and the control electrode is electrically connected with the second end of the first resistor, the first electrode of the first triode, the first electrode of the second triode and the first end of the sixth resistor;

[0037] The second end of the first capacitor is electrically connected with the first end of the second resistor and then grounded;

[0038] The control electrode of the second transistor is electrically connected with the second end of the second resistor and the first end of the third resistor respectively, and the second electrode is electrically connected with the power input end of the second power supply control module;

[0039] The second end of the third resistor is used for receiving an external power supply signal;

[0040] The control electrode of the first triode is electrically connected with the first end of the fourth resistor and the first end of the fifth resistor respectively, and the second electrode is electrically connected with the second end of the fifth resistor and then grounded;

[0041] The second end of the fourth resistor is electrically connected with the first control end of the system control chip;

[0042] The control end of the second triode is electrically connected with the second end of the sixth resistor, and the second electrode is electrically connected with the first electrode of the first diode;

[0043] The second electrode of the first diode is electrically connected with the first output end of the key module.

[0044] Optionally, the first voltage dividing unit comprises a seventh resistor and an eighth resistor; the fifth switch unit comprises a third transistor, and the sixth switch unit comprises a ninth resistor, a tenth resistor, an eleventh resistor and a third triode;

[0045] The first end of the seventh resistor is electrically connected with the output end of the first power supply control module and the first electrode of the third transistor, and the second end is electrically connected with the first end of the eighth resistor, the control end of the third transistor and the first end of the ninth resistor respectively;

[0046] The second end of the eighth resistor is electrically connected with the first end of the key;

[0047] The second end of the ninth resistor is electrically connected with the first end of the third triode;

[0048] The second electrode of the third triode is connected with the first end of the eleventh resistor and then grounded, and the control electrode is electrically connected with the second end of the eleventh resistor and the first end of the tenth resistor;

[0049] The second end of the tenth resistor is electrically connected with a second control end of the system control chip.

[0050] The second voltage dividing unit comprises a twelfth resistor and a second capacitor, a first end of the twelfth resistor is electrically connected with a first end of the second capacitor and a second end of the key, and a second end of the twelfth resistor and a second end of the second capacitor are electrically connected and grounded.

[0051] Optionally, the circuit further comprises:

[0052] a charging module and a charging control module;

[0053] The charging control module comprises a comparison unit, a seventh switch unit and an eighth switch unit;

[0054] The first input end of the comparison unit is electrically connected with the third output end of the second power supply control module, the first input end is connected with a preset potential, and the output end is electrically connected with the control end of the seventh switch unit;

[0055] The first end of the seventh switch unit is electrically connected with the first end of the eighth switch unit, and the second end is electrically connected with the control end of the eighth switch unit;

[0056] The first end of the eighth switch unit is used for receiving an external power supply signal, and the second end is electrically connected with the input end of the charging module;

[0057] The output end of the charging module is electrically connected with the battery;

[0058] The second power supply control module is used for outputting a first charging control signal to the comparison unit when the system control chip is powered off and an external power supply signal is received;

[0059] The comparison unit outputs a second charging control signal to the seventh switch unit after receiving the charging control signal;

[0060] The seventh switch unit is used for turning on after receiving the second charging control signal, so that the potential of the control end of the eighth switch unit becomes an on potential, the first end and the second end of the eighth switch unit are turned on, and the second end of the eighth switch unit outputs a charging voltage;

[0061] The charging module is used for charging the battery after receiving the charging voltage.

[0062] Optionally, the seventh switch unit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a fourth triode;

[0063] The eighth switch unit comprises a fourth transistor and a seventeenth resistor;

[0064] The first end of the thirteenth resistor is configured to receive an external power supply signal, and the first end is electrically connected to the first electrode of the fourth transistor, and the second end is electrically connected to the control electrode of the fourth transistor and the first end of the fourteenth resistor;

[0065] The second end of the fourteenth resistor is electrically connected to the first electrode of the fourth transistor;

[0066] The control electrode of the fourth transistor is electrically connected to the first end of the sixteenth resistor and the first end of the fifteenth resistor, respectively;

[0067] The second end of the fifteenth resistor is electrically connected to the second electrode of the fourth transistor and the first end of the seventeenth resistor, and then grounded;

[0068] The second end of the sixteenth resistor is electrically connected to the comparison unit;

[0069] The second electrode of the fourth transistor is electrically connected to the second end of the seventeenth resistor and the input end of the charging module.

[0070] Optionally, the circuit further comprises

[0071] a voltage adjustment module and a battery voltage detection module;

[0072] The input end of the voltage adjustment module is electrically connected to the output end of the first power supply control module, and the output end is electrically connected to the power input end of the second power supply control module;

[0073] The voltage adjustment module is configured to adjust the battery voltage output by the first power supply control module;

[0074] The detection end of the battery voltage detection module is electrically connected to the voltage output end of the battery, and the output end is electrically connected to the detection end of the system control chip;

[0075] The battery voltage detection module is configured to detect the battery voltage and send the battery voltage to the system control chip.

[0076] According to another aspect of the present application, a beauty instrument is provided, which comprises the power supply control circuit according to any of the embodiments of the present application.

[0077] The first power supply control module of the power supply control circuit of the embodiment of the present application disconnects the communication path between the battery and the second power supply control module when the system to be powered is powered off, and when the button is pressed, the button module outputs a first power supply control signal to the first power supply control module, and the first power supply control module outputs the battery voltage of the battery to the second power supply control module and the button module after receiving the first power supply control signal; the button module outputs a power-on control signal to the system control chip after receiving the battery voltage, so that the system control chip outputs a second power supply control signal to the first power supply control module and a third power supply control signal to the second power supply control module after being powered on; the first power supply control module continuously outputs the battery voltage to the second power supply control module and the button module after receiving the second power supply control signal and the button is released; and the second power supply control module outputs a system power supply voltage after receiving the third power supply control signal. In the embodiment, the first power supply control module disconnects the communication path between the battery and the second power supply control module when the system to be powered is powered off, so that the battery is disconnected from the system to be powered, avoiding the system to be powered being connected with the battery in the powered-off state, thereby reducing the static power consumption of the entire system, and the power-on of the system control chip and the start of the system to be powered are realized through the cooperation among the first power supply control module, the second power supply control module and the button module when the button is pressed.

[0078] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0079] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0080] Figure 1 is a schematic diagram of a power supply control circuit provided by an embodiment of the present application;

[0081] Figure 2 is a schematic diagram of another power supply control circuit provided by an embodiment of the present application;

[0082] Figure 3 is a schematic diagram of another power supply control circuit provided by an embodiment of the present application;

[0083] Figure 4 is a schematic diagram of another power supply control circuit provided by an embodiment of the present application;

[0084] Figure 5is a circuit schematic diagram of a first power supply control module provided by an embodiment of the present application;

[0085] Figure 6 is a circuit diagram of a key module and a second power supply control module provided by an embodiment of the present application;

[0086] Figure 7 is a schematic diagram of another power supply control circuit provided by an embodiment of the present application;

[0087] Figure 8 is a schematic diagram of a voltage adjustment module provided by an embodiment of the present application;

[0088] Figure 9 is a schematic diagram of an external power socket circuit provided by an embodiment of the present application;

[0089] Figure 10 is a circuit schematic diagram of a charging control module provided by an embodiment of the present application;

[0090] Figure 11 is a schematic diagram of a charging module provided by an embodiment of the present application;

[0091] Figure 12 is a schematic diagram of a voltage detection circuit provided by an embodiment of the present application. DETAILED DESCRIPTION

[0092] In order to make the personnel in the art better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0093] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0094] The embodiment of the present application provides a power supply control circuit, Figure 1is a schematic diagram of a power supply control circuit provided by an embodiment of the present application, referring to Figure 1 The circuit comprises:

[0095] a first power supply control module 10, a second power supply control module 20, and a key module 30.

[0096] The input end of the first power supply control module 10 is electrically connected with the voltage output end of a battery 40, the output end is electrically connected with the power input end of the second power supply control module 20, the first control end of the first power supply control module 10 is electrically connected with the first output end of the key module, and the second control end is electrically connected with the first control end PC10 of a system control chip.

[0097] The control end of the second power supply control module 20 is electrically connected with the second control end PC7 of the system control chip, the first output end is electrically connected with the input end of the key module, and the second output end is electrically connected with a to-be-powered system 100.

[0098] The second output end of the key module 30 is electrically connected with the power-on control end PC8 of the system control chip.

[0099] The key module 30 comprises a key, and the key module 30 is configured to output a first power supply control signal control to the first power supply control module 10 when the key is pressed.

[0100] The first power supply control module 10 is configured to disconnect the communication path between the battery 40 and the second power supply control module 20 when the system control chip is powered off, and to turn on the communication path between the battery 40 and the second power supply control module 20 after receiving the first power supply control signal control, so that the battery voltage of the battery 40 is output to the second power supply control module 20 and the key module 30.

[0101] The key module 30 is further configured to output a power-on / off control signal to the system control chip after receiving the battery voltage, so that the system control chip outputs a second power supply control signal to the first power supply control module 10 and a third power supply control signal to the second power supply control module 20 after being started.

[0102] The first power supply control module 10 is further configured to maintain the communication path between the battery 40 and the second power supply control module 20 after the key is released after receiving the second power supply control signal.

[0103] The second power supply control module 20 is configured to output a system power supply voltage VCC to the to-be-powered system after receiving the third power supply control signal.

[0104] The system supply voltage VCC is used to supply power to the system to be powered. The voltage adjustment module can be connected between the output end of the first power supply control module 20 and the power input end of the second power supply control module 30, and the voltage adjustment module can have a voltage boosting or voltage reducing function, etc. The voltage adjustment module adjusts the size of the battery voltage and outputs it to the second power supply control module 30 to meet the power supply requirements of the system to be powered. The power-on control signal, the first power supply control signal control, the second power supply control signal and the third power supply control signal can be high level signals or low level signals, and the specific signal form can be set as needed, and the embodiment does not make specific limitation. The system control chip is the master control chip in the system to be powered 100. The system control chip outputs the second power supply control signal to the first power supply control module 10 through the first control end PC10, and outputs the third power supply control signal to the second power supply control module 20 through the second control end PC7. The holding time of the pressed state of the key needs to be greater than or equal to the set time, so as to ensure that the time when the system control chip receives the power-on control signal after the key is pressed meets the booting time requirement, and the system control chip can output the second power supply control signal and the third power supply control signal to the first power supply control module 10 and the second power supply control module 20 respectively. For example, the set time can be 3s, 4s, etc.

[0105] Specifically, when the system control chip is in the shutdown state, if the key is pressed, the key module 30 first outputs the first power supply control signal control to the first control end of the first power supply control module 10, so that the first power supply control module 10 outputs the battery voltage to the second power supply control module 20 and the key module 30. After the battery voltage supplies power to the key module 30, the key module 30 outputs the power-on control signal to the system control chip, and the system control chip is powered on. The system control chip outputs the second power supply control signal to the second control end of the first power supply control module 10 through the first control end PC10, and outputs the third power supply control signal to the control end of the second power supply control module 20 through the second control end PC7. After the first power supply control module 10 receives the second power supply control signal, the communication path between the battery 40 and the second power supply control module 20 is continuously turned on after the key is released, and the battery voltage is continuously output to the second power supply control module 20 and the key module 30. After the second power supply control module 20 receives the third power supply control signal, the system supply voltage VCC is output to supply power to the system to be powered 100, thereby realizing the start of the system to be powered 100. The power supply control system of the embodiment only needs to press the key to boot the system to be powered 100 when it is needed to control the start of the system to be powered 100.

[0106] In addition, the first power supply control module 10 only outputs the battery voltage after receiving the first power supply control signal control output by the key module 30, and continues to output the battery voltage after receiving the second power supply control signal of the system control chip. When the system control chip is powered off and the key is not pressed, the first power supply control module 10 disconnects the communication path between the battery 40 and the second power supply control module 20, so that the battery 40 is disconnected from the system to be powered 100, thereby reducing the static power consumption of the whole system.

[0107] In the power supply control circuit of the embodiment of the application, when the system to be powered is powered off, the first power supply control module 10 disconnects the communication path between the battery 40 and the second power supply control module 20. When the key is pressed, the key module 30 outputs the first power supply control signal control to the first power supply control module 10. The first power supply control module 10 outputs the battery voltage of the battery 40 to the second power supply control module 20 and the key module 30 after receiving the first power supply control signal control. The key module 30 outputs the power-on control signal to the system control chip after receiving the battery voltage, so that the system control chip outputs the second power supply control signal to the first power supply control module 10 and outputs the third power supply control signal to the second power supply control module 20 after being powered on. The first power supply control module 10 continues to output the battery voltage to the second power supply control module 20 and the key module 30 after receiving the second power supply control signal and the key is released. The second power supply control module 20 outputs the system power supply voltage VCC after receiving the third power supply control signal. In this embodiment, when the system to be powered is powered off, the first power supply control module 10 disconnects the communication path between the battery 40 and the second power supply control module 20, so that the battery 40 is disconnected from the system to be powered 100, thereby reducing the static power consumption of the whole system. When the key is pressed, the system control chip is powered on and the system to be powered 100 is started through the cooperation of the first power supply control module 10, the second power supply control module 20 and the key module 30.

[0108] Optionally, the third control end of the first power supply control module 10 and the power input end of the second power supply control module 10 are used to receive an external power signal DC.

[0109] The first power supply control module 10 is used to disconnect the communication path between the battery 40 and the second power supply control module 20 and stop outputting the battery voltage to the second power supply control module 20 when the third control end receives the external power signal DC.

[0110] Specifically, when the battery 40 supplies power to the system 50, after the external power supply is connected to the system, the third control end of the first power supply control module 10 receives the external power supply signal DC and stops outputting the battery voltage to the second power supply control module 20. Since the power input end of the second power supply control module 20 can also receive the external power supply signal DC, after the battery voltage stops being output, the external power supply signal DC starts to supply power to the second power supply control module 20, so that the second power supply control module 20 continuously outputs the system power supply voltage VCC, and the automatic switching of the external power supply and the battery power supply is realized.

[0111] Figure 2 is another schematic diagram of a power supply control circuit provided by an embodiment of the application, referring to Figure 2 The first power supply control module 10 includes a first switching unit 11, a second switching unit 12, a third switching unit 13 and a fourth switching unit 14.

[0112] The first end of the first switching unit 11 is electrically connected to the voltage output end of the battery 40, the second end is electrically connected to the first end of the second switching unit 12, the third end is connected to the first control end of the second switching unit 11 and then grounded, and the control end is electrically connected to the first end of the third switching unit 13 and the first end of the fourth switching unit 14.

[0113] The second end of the second switching unit 12 is electrically connected to the voltage input end of the second power supply control module 20, and the second control end is used for receiving the external power supply signal DC.

[0114] The second end of the third switching unit 13 is grounded, and the control end is electrically connected to the first control end of the system control chip.

[0115] The control end of the fourth switching unit 14 is electrically connected to the first output end of the key module 30.

[0116] The fourth switching unit 14 is used for turning on after receiving the first power supply control signal Control output by the key module 30, so that the potential of the control end of the first switching unit 11 becomes the on potential, the first switching unit 11 is turned on, and the first end of the second switching unit 12 and the voltage output end of the battery 40 are connected.

[0117] The second switching unit 12 is used for turning on after the first switching unit 11 is turned on, so that the battery voltage of the battery 40 is output to the second power supply control module 20, and is disconnected when the external power supply signal DC is received.

[0118] The third switching unit 13 is used for turning on after receiving the second power supply control signal sent by the system control chip, so that the potential of the control end of the first switching unit 11 is maintained at the on potential, and the first switching unit 11 is continuously turned on after the key is released.

[0119] The first switch unit 11, the second switch unit 12, the third switch unit 13 and the fourth switch unit 14 can include a triode or a transistor or other controllable switch element. The on potential of the first switch unit 11 can be a high potential or a low potential, which is not limited in the embodiment.

[0120] Specifically, when the to-be-powered system is in a shutdown state and the key is not pressed, the first switch unit 11, the second switch unit 12, the third switch unit 13 and the fourth switch unit 14 are all in an off state, the battery 40 is disconnected with the second switch unit 12, the second power supply control module 20 and the to-be-powered system, thereby reducing the system power consumption. When the key is pressed, the key module 30 outputs a first power supply control signal Control to the fourth switch unit 14, the fourth switch unit 14 is turned on, the control end potential of the first switch unit 11 becomes an on potential, the first switch unit 11 is turned on, thereby the second switch unit 12 is turned on, and the battery voltage is output to the second power supply control module 20. The system control chip is turned on and sends a second power supply control signal to the third switch unit 13, the third switch unit 13 is turned on, the control end potential of the first switch unit 11 is maintained at the on potential, and the battery voltage is continuously output to the second power supply control module 20.

[0121] After the external power supply is connected to the system, the second control end potential of the second switch unit 12 becomes a non-on potential, the second switch unit 12 is disconnected, the output of the battery voltage to the second power supply control module 20 is stopped, and the automatic switching between the external power supply and the battery 40 is realized.

[0122] Figure 3 is another schematic diagram of a power supply control circuit provided by the embodiment of the application, referring to Figure 3 The second power supply control module 20 includes a first voltage dividing unit 21, a fifth switch unit 22 and a sixth switch unit 23.

[0123] The first end of the first voltage dividing unit 21 is electrically connected with the output end of the first power supply control module 10 and the first end of the fifth switch unit 22, the second end is electrically connected with the input end of the key module 30, and the third end is electrically connected with the control end of the fifth switch unit 22 and the first end of the sixth switch unit 23.

[0124] The second end of the sixth switch unit 23 is grounded, and the control end is electrically connected with the second control end PC7 of the system control chip.

[0125] The sixth switch unit 23 is used for turning on after receiving the third power supply control signal output by the system control chip, changing the control end potential of the fifth switch unit 22 to an on potential, and turning on the fifth switch unit 22.

[0126] The fifth switch unit 22 is used for outputting the system supply voltage VCC through the second end after being turned on.

[0127] The first voltage dividing unit 21 can include one or more resistors, and the fifth switch unit 22 and the sixth switch unit 23 can include a switching element such as a transistor or a triode, or other switch elements that can be controlled to be on or off, which are not limited in the embodiment. The on potential of the fifth switch unit 22 can be a high potential or a low potential, which is not limited in the embodiment.

[0128] After the battery voltage is input to the first voltage dividing unit 21, the battery voltage is output to the key module 30 and the first end of the sixth switch unit 23 after passing through the voltage dividing unit 21. After the key module 30 is powered, the key module 30 outputs a power-on control signal to control the system control chip to be powered on, so that the control end of the sixth switch unit 23 receives the third supply control signal sent by the second control end PC7 of the system control chip, the sixth switch unit 23 is turned on, and the potential of the control end of the fifth switch unit 22 becomes the on potential, so that the fifth switch unit 22 is turned on, and the system supply voltage VCC is output to the system to be powered.

[0129] Figure 4 is another schematic diagram of a power supply control circuit provided by the embodiment of the application, referring to Figure 4 Optionally, the key module 30 includes a second voltage dividing unit 31 and a key 32.

[0130] The first end of the second voltage dividing unit 31 is electrically connected with the first end of the key 32 and the power-on control end PC8 of the system control chip, and the second end is connected with a preset potential.

[0131] The second end of the key 32 is electrically connected with the first output end of the second supply control unit 20.

[0132] Specifically, the preset potential can be set according to the control requirement, and the exemplary preset potential can be zero potential, that is, the second end of the second voltage dividing unit 31 can be grounded. When the key is pressed when the system to be powered is in the power-off state, the second end of the key 32 is grounded, and the first supply control signal Control is output to the fourth switch unit 14, so that the first supply control module 10 is turned on. After the first supply control module 10 is turned on, the battery voltage is input to the key module 30 through the second supply control module 20, the potential between the two ends of the key 32 is changed, the first end of the key 32 outputs the power-on control signal to the power-on control end PC8 of the system control chip, and the system control chip is powered on.

[0133] Figure 5 is a circuit schematic diagram of a first supply control module provided by the embodiment of the application, referring to Figure 5 Optionally, the first switch unit 11 includes a first transistor Q1, a first resistor R1 and a first capacitor C1.

[0134] The second switch unit 12 comprises a second transistor Q2, a second resistor R2 and a third resistor R3;

[0135] The third switch unit 13 comprises a first triode U1, a fourth resistor R4 and a fifth resistor R5;

[0136] The fourth switch unit 14 comprises a second triode U2, a sixth resistor R6 and a first diode D25;

[0137] The first pole of the first transistor Q1 is electrically connected with the first end of the first resistor R1 and the voltage output end of the battery respectively, the second pole is electrically connected with the first end of the first capacitor C1 and the first pole of the second transistor Q2, and the control pole is electrically connected with the second end of the first resistor R1, the first pole of the first triode U1, the first pole of the second triode U2 and the first end of the sixth resistor R6;

[0138] The second end of the first capacitor C1 is electrically connected with the first end of the second resistor R2 and grounded;

[0139] The control pole of the second transistor Q2 is electrically connected with the second end of the second resistor R2 and the first end of the third resistor R3 respectively, and the second pole is electrically connected with the power input end of the second power supply control module;

[0140] The second end of the third resistor R3 is used for receiving an external power signal DC;

[0141] The control pole of the first triode U1 is electrically connected with the first end of the fourth resistor R4 and the first end of the fifth resistor R5 respectively, and the second pole is electrically connected with the second end of the fifth resistor R5 and grounded;

[0142] The second end of the fourth resistor R4 is electrically connected with the first control end PC10 of the system control chip;

[0143] The control end of the second triode U2 is electrically connected with the second end of the sixth resistor R6, and the second pole is electrically connected with the first pole of the first diode D25;

[0144] The second pole of the first diode D25 is electrically connected with the first output end of the key module.

[0145] Figure 6 It is a kind of circuit diagram of key module and second power supply control module provided by the embodiment of the application, reference Figure 6 , the first voltage division unit 21 comprises seventh resistor R7 and eighth resistor R8;The fifth switch unit 22 comprises third transistor Q3, the sixth switch unit 23 comprises ninth resistor R9, tenth resistor R10, eleventh resistor R11 and third triode U3;

[0146] The first end of the seventh resistor R7 is electrically connected with the output end of the first power supply control module 10 and the first electrode of the third transistor Q3, and the second end is respectively electrically connected with the first end of the eighth resistor R8, the control end of the third transistor Q3 and the first end of the ninth resistor R9;

[0147] The second end of the eighth resistor R8 is electrically connected with the first end of the key;

[0148] The second end of the ninth resistor R9 is electrically connected with the first end of the third triode U3;

[0149] The second electrode of the third triode U3 is connected with the first end of the eleventh resistor R11 and grounded, and the control electrode is electrically connected with the second end of the eleventh resistor R11 and the first end of the tenth resistor R10;

[0150] The second end of the tenth resistor R10 is electrically connected with the second control end PC7 of the system control chip;

[0151] The second voltage dividing unit 31 includes the twelfth resistor R12 and the second capacitor C2, the first end of the twelfth resistor R12 is electrically connected with the first end of the second capacitor C2 and the second end of the key 32, and the second end of the twelfth resistor R12 and the second end of the second capacitor C2 are electrically connected and grounded.

[0152] Specifically, referring to Figure 5 and Figure 6 , the BAT-12 is the battery voltage, when the system is in the shutdown state, and the key 32 is not pressed, the gate of the first transistor Q1 is connected with the battery by the pull-up resistor (the first resistor R1), the first transistor Q1 is in the cut-off state, and the battery 40 is in the disconnected state with the system to be powered.

[0153] When the system needs to start (no external power supply), the potential of the base of the second triode U2 is pulled high by the sixth resistor R6, and after the button 32 is pressed, the second triode U2 is connected to the first power supply control signal Control, the second triode U2 is turned on, and the collector of the second triode U2 is pulled low to make the gate potential of the first transistor Q1 be pulled low to be turned on. The second triode Q2 is turned on by pulling the gate potential low through the second resistor R2. The battery voltage BAT-12 is output to the seventh resistor R7 and the third transistor Q3 through the first transistor Q1 and the second transistor Q2. At this time, the button 32 is in the pressed state, and a sustained high level is output to the start control end PC8 of the system control chip through the resistors R7, R8 and R12, and the system control chip starts after 3S. After starting, the first control end PC10 of the system control chip outputs a high level, the base potential of the first triode U1 is pulled high, the first triode U1 is turned on, and the gate potential of the first triode Q1 is continuously pulled low to be in the turned-on state. At the same time, the first triode U1 pulls the collector and base potential of the second triode U2 low to be cut off, so as not to affect the subsequent circuit. At the same time, the second control end PC7 of the system control chip also outputs a high level, the base potential of the third triode U3 is pulled high to be turned on, the gate potential of the third transistor Q3 is pulled low to be turned on, and the standby power supply system obtains the system power supply voltage VCC to complete the start.

[0154] When the standby power supply system is in the start state, when the system needs to be turned off, the button 32 is pressed for a long time, the start control end PC8 of the system control chip obtains a high level, and the system control chip is turned off after 3S. All pins are released, the first control end PC10 and the second control end PC7 of the system control chip no longer output control signals, at this time, the button 32 is released, the gate of the first transistor Q1 is connected with the battery 40 through the first resistor R1, the gate potential is pulled high by the first resistor R1 to make the first transistor Q1 be in the cut-off state, and the battery 40 is automatically disconnected with the standby power supply system when the standby power supply system is turned off. At the same time, the base potential of the second triode U2 is pulled high by the sixth resistor R6 to be in the standby turned-on state, and the next system start is prepared.

[0155] When the standby power supply system is in the start state, after the external power supply is connected, the gate potential of the second transistor Q2 is pulled high by the third resistor R3 to be cut off, the battery 40 is disconnected with the standby power supply system, and the external power supply supplies power to the standby power supply system through the second power supply control module.

[0156] Figure 7 is another power supply control circuit provided by the embodiment of the application, Figure 8 is a voltage adjustment module provided by the embodiment of the application, and Figure 7 and Figure 8The power supply control system further comprises a voltage adjustment module 70, an input end of the voltage adjustment module 70 being electrically connected with an output end of the first power supply control module 10, and an output end being electrically connected with a power input end of the second power supply control module 20; the voltage adjustment module 70 is used for adjusting the battery voltage output by the first power supply control module 20.

[0157] Specifically, the power supply adjustment module 70 can boost or step down the battery voltage to match the system to be powered. The embodiment takes the voltage adjustment module 70 as a boost module as an example for description. Figure 9 is a schematic diagram of an external power socket circuit provided by the embodiment of the application. Exemplarily, reference is made to Figures 5-7 and Figure 9 After the first transistor Q1 and the second transistor Q2 are turned on, the battery voltage VAT-12 is boosted to BAT22V by the voltage adjustment module, 22V is obtained through the diode D14, and is output to the seventh resistor R7 and the third transistor Q3.

[0158] When the adapter is connected to the DC seat J1, the external power supply signal is connected to the system, DC22V is powered first, and the second transistor Q2 is disconnected. After DC22V is powered, 22V is obtained through the diode D23.

[0159] In addition, reference is made to Figure 6 The key module can further comprise a diode D26, a resistor R40 and a resistor R111. Reference is made to Figure 8 The voltage adjustment module can comprise a boost chip U6 and an inductor, a plurality of resistors and a plurality of capacitors, and the specific circuit form of the voltage adjustment module is not specifically limited in the embodiment.

[0160] Optionally, reference is made to Figure 7 The power supply control circuit further comprises:

[0161] a charging module 50 and a charging control module 60;

[0162] The charging control module 60 comprises a comparison unit 61, a seventh switch unit 62 and an eighth switch unit 63;

[0163] A first input end of the comparison unit 61 is electrically connected with a third output end NOT of the second power supply control module 20, a first input end is connected with a preset potential, and an output end is electrically connected with a control end of the seventh switch unit 62;

[0164] A first end of the seventh switch unit 62 is electrically connected with a first end of the eighth switch unit 63, and a second end is electrically connected with a control end of the eighth switch unit 63;

[0165] A first end of the eighth switch unit 63 is used for receiving an external power supply signal DC, and a second end is electrically connected with an input end of the charging module 50;

[0166] The output end of the charging module 50 is electrically connected with the battery 40;

[0167] The second power supply control module 20 is used for outputting a first charging control signal to the comparison unit 61 when the system control chip is powered off and the external power signal DC is received;

[0168] The comparison unit 61 outputs a second charging control signal to the seventh switch unit 62 after receiving the charging control signal;

[0169] The seventh switch unit 62 is used for turning on after receiving the second charging control signal, so that the control end of the eighth switch unit 63 becomes a turn-on potential, the first end and the second end of the eighth switch unit 63 are turned on, and the second end of the eighth switch unit 63 outputs the charging voltage;

[0170] The charging module 50 is used for charging the battery 40 after receiving the charging voltage.

[0171] Specifically, the second power supply control module 20 outputs the first charging control signal to the comparison unit 61 only when the system control chip is powered off and the external power signal DC is received, so that the charging module 50 charges the battery 40. The turn-on potential of the eighth switch unit 63 can be a high potential or a low potential, which is not limited in the embodiment.

[0172] Figure 10 is a circuit schematic diagram of a charging control module provided by the embodiment of the application, referring to Figure 10 The seventh switch unit 62 includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16 and a fourth triode U4;

[0173] The eighth switch unit 63 includes a fourth transistor Q4 and a seventeenth resistor R17;

[0174] The first end of the thirteenth resistor R13 is used for receiving the external power signal, and the first end is electrically connected with the first pole of the fourth transistor Q4, and the second end is electrically connected with the control pole of the fourth transistor Q4 and the first end of the fourteenth resistor R14;

[0175] The second end of the fourteenth resistor R14 is electrically connected with the first pole of the fourth triode U4;

[0176] The control pole of the fourth triode U4 is electrically connected with the first end of the sixteenth resistor R16 and the first end of the fifteenth resistor R15 respectively;

[0177] The second end of the fifteenth resistor R15 is electrically connected with the second pole of the fourth triode U4 and the first end of the seventeenth resistor R17 respectively and grounded;

[0178] The second end of the sixteenth resistor R16 is electrically connected with the comparison unit 61.

[0179] The second pole of the fourth transistor Q4 is electrically connected with the second end of the seventeenth resistor R17 and the input end of the charging module.

[0180] Specifically, the comparison unit 61 can include a comparator U11. Figure 11 is a schematic diagram of a charging module provided by an embodiment of the present application, which is combined with Figure 6 , Figures 9-11 The charging process of the battery 40 is described as follows: when the power supply system is in a shutdown state and the battery 40 does not supply power to the outside, the adapter is connected to the DC seat J1, DC 22V is powered first, and 22V is powered after passing through the diode D23. At this time, the key 32 is not pressed, the third transistor Q3 is cut off by the seventh resistor R7, the collector voltage of the third transistor U3 is 22V, the IN+ pin of the comparator U11 is connected, the voltage of the IN- pin of the comparator U11 is fixed at 11V by resistance division, the voltage of IN+ is greater than that of IN- at this time, the output end of the comparator U11 is high impedance, the output end is pulled to 22V by the pull-up resistor R109, the voltage is controlled to 3.6V by the voltage stabilizing diode D22, and finally the base of the fourth transistor U4 is output, so that the base of the fourth transistor U4 is high level, the fourth transistor U4 is in a conductive state, the gate of the fourth transistor Q4 is pulled low, and the voltage difference between the source and the gate of the fourth transistor Q4 is formed to satisfy the conduction of the fourth transistor Q4. The fourth transistor Q4 is turned on, CH-22V is powered, a charging voltage CH-22V is provided for the charging module, and the battery is charged.

[0181] In addition, with reference to Figure 6 and Figure 10 When the key 32 is pressed while charging, a high level is obtained through the startup control end PC8 of the system control chip, the system control chip is started after 3S, the system is started, the second control end PC7 of the system control chip outputs a high level, the third transistor U3 is turned on, the collector potential of the third transistor U3 is pulled low, the signal output to the IN+ pin of the comparator U11 becomes low level, the voltage of IN+ is less than that of IN- at this time, the output end of the comparator U11 is low level, the base of the fourth transistor U4 is pulled low to turn off the fourth transistor U4, the gate of the fourth transistor Q4 is pulled up to DC 22V through the thirteenth resistor R13 to turn off the fourth transistor Q4. The potential of the second pole of the fourth transistor Q4 is continuously pulled low by the seventeenth resistor R17, the charging voltage CH-22V output to the charging module is stopped, and the charging of the charging module is terminated. The gate of Q3 is pulled low to turn on, the system obtains the voltage VCC to complete the startup.

[0182] The charging control module and the charging module in the embodiment do not allow the battery to be charged after the system control chip is started and the whole power supply system is started, so as to ensure the safety of the system.

[0183] It should be noted that the charging module can include a charging management chip U5, a P-channel MOS tube U7, and a plurality of resistors, a plurality of diodes, and an inductor, and the specific circuit form of the charging module is not limited in the embodiment.

[0184] In addition, the first, second, third, and fourth triodes can all be NPN triodes, and the first, second, third, and fourth transistors can all be P-channel MOS tubes. D14, D20, D21, D23, D24, D25, and D26 in the circuit are all anti-backflow diodes, which prevent current from flowing from the cathode to the anode of the diode.

[0185] Figure 12 is a schematic diagram of a voltage detection circuit provided by an embodiment of the application, referring to Figure 12 The power supply control circuit further includes a battery voltage detection module 70.

[0186] The detection end of the battery voltage detection module 70 is electrically connected with the voltage output end of the battery, and the output end is electrically connected with the detection end PC5 of the system control chip.

[0187] The battery voltage detection module 70 is used for detecting the battery voltage BAT-12 and sending the battery voltage BAT-12 to the system control chip.

[0188] Specifically, the system control chip collects the battery voltage BAT-12 in real time through the detection end PC5 to prevent over-discharge of the battery.

[0189] The embodiment of the application further provides a beauty instrument including the power supply control circuit described in any embodiment of the application.

[0190] It should be understood that the various forms of flow shown above can be reordered, added, or deleted. For example, the steps described in the application can be executed in parallel, in sequence, or in different orders, as long as the desired results of the technical solutions of the application can be achieved, and the present application does not limit this. The above detailed description does not constitute a limitation on the scope of protection of the application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the application shall be included in the scope of protection of the application.

Claims

1. A power supply control circuit, characterized in that, include: The system comprises a first power supply control module, a second power supply control module, and a button module. The input terminal of the first power supply control module is electrically connected to the voltage output terminal of the battery, the output terminal is electrically connected to the power input terminal of the second power supply control module, the first control terminal is electrically connected to the first output terminal of the button module, and the second control terminal is electrically connected to the first control terminal of the system control chip. The control terminal of the second power supply control module is electrically connected to the second control terminal of the system control chip, the first output terminal is electrically connected to the input terminal of the button module, and the second output terminal is electrically connected to the system to be powered. The second output terminal of the button module is electrically connected to the power-on control terminal of the system control chip; The button module includes a button, and the button module is used to output a first power supply control signal to the first power supply control module when the button is pressed. The first power supply control module is used to disconnect the connection between the battery and the second power supply control module when the system control chip is powered off, and to connect the connection between the battery and the second power supply control module after receiving the first power supply control signal, so that the battery voltage of the battery is output to the second power supply control module and the button module. The button module is also used to output a power on / off control signal to the system control chip after receiving the battery voltage, so that the system control chip outputs a second power supply control signal to the first power supply control module and a third power supply control signal to the second power supply control module after starting. The first power supply control module is also used to, after receiving the second power supply control signal, continuously maintain the connection path between the battery and the second power supply control module after the button is released; The second power supply control module is used to output the system power supply voltage to the system to be powered after receiving the third power supply control signal.

2. The circuit according to claim 1, characterized in that: The third control terminal of the first power supply control module and the power input terminal of the second power supply control module are both used to receive external power signals. The first power supply control module is used to disconnect the connection between the battery and the second power supply control module when the third control terminal receives an external power supply signal, and to stop outputting the battery voltage to the second power supply control module.

3. The circuit according to claim 2, characterized in that: The first power supply control module includes a first switch unit, a second switch unit, a third switch unit, and a fourth switch unit; The first terminal of the first switching unit is electrically connected to the voltage output terminal of the battery, the second terminal is electrically connected to the first terminal of the second switching unit, the third terminal is connected to the first control terminal of the second switching unit and then grounded, and the control terminal is electrically connected to the first terminal of the third switching unit and the first terminal of the fourth switching unit respectively. The second terminal of the second switching unit is electrically connected to the voltage input terminal of the second power supply control module, and the second control terminal is used to receive external power supply signals; The second terminal of the third switching unit is grounded, and the control terminal is electrically connected to the first control terminal of the system control chip. The control terminal of the fourth switch unit is electrically connected to the first output terminal of the button module; The fourth switch unit is used to turn on after receiving the first power supply control signal output by the button module, so that the potential of the control terminal of the first switch unit becomes the conduction potential, so that the first switch unit is turned on, connecting the first terminal of the second switch unit and the voltage output terminal of the battery. The second switching unit is used to turn on after the first switching unit is turned on, so that the battery voltage of the battery is output to the second power supply control module, and to turn off when an external source signal is received; The third switch unit is used to turn on after receiving the second power supply control signal sent by the system control chip, so that the potential of the control terminal of the first switch unit is maintained at the on-state potential, and the first switch unit continues to be on when the button is released.

4. The circuit according to claim 1, characterized in that: The second power supply control module includes a first voltage divider unit, a fifth switching unit, and a sixth switching unit; The first end of the first voltage divider unit is electrically connected to the output end of the first power supply control module and the first end of the fifth switch unit, the second end is electrically connected to the input end of the button module, and the third end is electrically connected to the control end of the fifth switch unit and the first end of the sixth switch unit. The second terminal of the sixth switch unit is grounded, and the control terminal is electrically connected to the second control terminal of the system control chip. The sixth switch unit is used to turn on after receiving the third power supply control signal output by the system control chip, and to change the potential of the control terminal of the fifth switch unit to the conduction potential, so that the fifth switch unit is turned on. The fifth switching unit is used to output the system power supply voltage through the second terminal after being turned on.

5. The circuit according to claim 1 or 4, characterized in that: The button module includes a second voltage divider unit and a button; The first end of the second voltage divider unit is electrically connected to the first end of the button and the power-on control terminal of the system control chip, and the second end is connected to a preset potential; The second end of the button is electrically connected to the first output end of the second power supply control unit.

6. The circuit according to claim 3, characterized in that: The first switching unit includes a first transistor, a first resistor, and a first capacitor; The second switching unit includes a second transistor, a second resistor, and a third resistor; The third switching unit includes a first transistor, a fourth resistor, and a fifth resistor; The fourth switching unit includes a second transistor, a sixth resistor, and a first diode; The first terminal of the first transistor is electrically connected to the first end of the first resistor and the voltage output terminal of the battery, the second terminal is electrically connected to the first end of the first capacitor and the first terminal of the second transistor, and the control terminal is electrically connected to the second end of the first resistor, the first terminal of the first transistor, the first terminal of the second transistor and the first end of the sixth resistor. The second terminal of the first capacitor is electrically connected to the first terminal of the second resistor and then grounded. The control electrode of the second transistor is electrically connected to the second terminal of the second resistor and the first terminal of the third resistor, respectively, and the second electrode is electrically connected to the power input terminal of the second power supply control module. The second end of the third resistor is used to receive external power supply signals; The control terminal of the first transistor is electrically connected to the first terminal of the fourth resistor and the first terminal of the fifth resistor, respectively, and the second terminal is electrically connected to the second terminal of the fifth resistor and then grounded. The second end of the fourth resistor is electrically connected to the first control terminal of the system control chip. The control terminal of the second transistor is electrically connected to the second terminal of the sixth resistor, and the second terminal is electrically connected to the first terminal of the first diode; The second terminal of the first diode is electrically connected to the first output terminal of the button module.

7. The circuit according to claim 5, characterized in that: The first voltage divider unit includes the seventh resistor and the eighth resistor; the fifth switching unit includes the third transistor; and the sixth switching unit includes the ninth resistor, the tenth resistor, the eleventh resistor, and the third transistor. The first end of the seventh resistor is electrically connected to the output end of the first power supply control module and the first electrode of the third transistor, and the second end is electrically connected to the first end of the eighth resistor, the control end of the third transistor, and the first end of the ninth resistor, respectively. The second end of the eighth resistor is electrically connected to the first end of the button; The second end of the ninth resistor is electrically connected to the first end of the third transistor; The second terminal of the third transistor is connected to the first terminal of the eleventh resistor and then grounded; the control terminal is electrically connected to the second terminal of the eleventh resistor and the first terminal of the tenth resistor. The second terminal of the tenth resistor is electrically connected to the second control terminal of the system control chip. The second voltage divider unit includes a twelfth resistor and a second capacitor. The first end of the twelfth resistor is electrically connected to the first end of the second capacitor and the second end of the button. The second end of the twelfth resistor and the second end of the second capacitor are electrically connected and then grounded.

8. The circuit according to claim 2, characterized in that, Also includes: Charging module and charging control module; The charging control module includes a comparison unit, a seventh switch unit, and an eighth switch unit; The first input terminal of the comparison unit is electrically connected to the third output terminal of the second power supply control module, the first input terminal is connected to a preset potential, and the output terminal is electrically connected to the control terminal of the seventh switch unit. The first end of the seventh switch unit is electrically connected to the first end of the eighth switch unit, and the second end is electrically connected to the control end of the eighth switch unit. The first end of the eighth switch unit is used to receive an external power signal, and the second end is electrically connected to the input end of the charging module. The output terminal of the charging module is electrically connected to the battery. The second power supply control module is used to output a first charging control signal to the comparison unit when the system control chip is powered off and an external power supply signal is received; After receiving the charging control signal, the comparison unit outputs a second charging control signal to the seventh switch unit; The seventh switch unit is used to turn on after receiving the second charging control signal, so that the potential of the control terminal of the eighth switch unit becomes the conduction potential, so that the first terminal and the second terminal of the eighth switch unit are turned on, and the second terminal of the eighth switch unit outputs the charging voltage. The charging module is used to charge the battery after receiving the charging voltage.

9. The circuit according to claim 8, characterized in that: The seventh switching unit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a fourth transistor; The eighth switching unit includes a fourth transistor and a seventeenth resistor; The first end of the thirteenth resistor is used to receive an external power supply signal, and the first end is electrically connected to the first electrode of the fourth transistor, and the second end is electrically connected to the control electrode of the fourth transistor and the first end of the fourteenth resistor. The second terminal of the fourteenth resistor is electrically connected to the first terminal of the fourth transistor; The control terminal of the fourth transistor is electrically connected to the first terminal of the sixteenth resistor and the first terminal of the fifteenth resistor, respectively. The second terminal of the fifteenth resistor is electrically connected to the second terminal of the fourth transistor and the first terminal of the seventeenth resistor, respectively, and then grounded. The second terminal of the sixteenth resistor is electrically connected to the comparison unit; The second terminal of the fourth transistor is electrically connected to the second terminal of the seventeenth resistor and the input terminal of the charging module.

10. A beauty device, characterized in that, Includes the power supply control circuit as described in any one of claims 1-9.

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