Skin treatment device and control circuit thereof

Abstract

The utility model relates to the field of circuit protection of skin treatment devices, and provides a skin treatment device and a control circuit thereof. The control circuit of the skin treatment device comprises a power supply unit, a power receiving unit and a power-off protection unit. The power-off protection unit is used for detecting whether the output voltage of the first power supply branch reaches the preset condition or not so as to determine whether the skin treatment device is in the voltage abnormal state or not, and when the output voltage of the first power supply branch reaches the preset condition, the power receiving unit can be closed to prevent the power receiving unit from making an abnormal response in the output voltage abnormal state; under the condition that the output voltage of the skin treatment device is abnormal, the risk that the power receiving unit is damaged or abnormal response is caused is reduced, and the stability of the skin treatment device is improved.

Description

Technical Field

[0001] This application belongs to the field of circuit protection for skin treatment devices, and particularly relates to a skin treatment device and its control circuit. Background Art

[0002] Currently, most skin treatment devices on the market (such as hair removal devices or skin rejuvenation devices, etc.) are equipped with a power output unit, a sensor unit, a detection and recognition unit, etc., which are respectively used to output power to act on the skin, obtain parameters such as temperature, and perform detection and recognition. For example, the power output unit can be a pulsed light trigger unit, a halogen lamp unit, a microcurrent / radio frequency output unit, or an ultrasonic output unit, etc. In actual applications, when the skin treatment device responds to a power output operation instruction, it is necessary to use a drive unit to send a drive signal to the power output unit, and then the power output unit can be controlled to work. The sensor unit and the detection and recognition unit also need to work under certain voltage conditions to obtain accurate detection and recognition parameters.

[0003] However, in the case of power failure of the skin treatment device, for example, the connection between the skin treatment device and the power adapter is loose, or the plug of the power adapter is loose, etc. If the skin treatment device still responds to the power output operation instruction, on the one hand, using the drive unit to send a drive signal to the power output unit will cause the drive signal to be unable to make the power output unit work properly due to insufficient power supply, and thus increase the risk of damage to the power output unit. On the other hand, the detection and recognition results of the sensor unit and the detection and recognition unit are prone to deviation, affecting normal work. It can be seen that the existing control circuit of the skin treatment device has a problem of poor stability. Summary of the Utility Model

[0004] The purpose of this application is to provide a skin treatment device and its control circuit, aiming to solve the problem of poor stability existing in the control circuit of the above skin treatment device.

[0005] In the first aspect of the embodiments of this application, a control circuit of a skin treatment device is provided, including:

[0006] A power supply unit, including a first power supply branch, and the first power supply branch is used to output a voltage;

[0007] A power receiving unit, connected to the first power supply branch, and the power receiving unit is configured with a controlled node;

[0008] A power-off protection unit, one end is connected to the first power supply branch, and the other end is connected to the controlled node of the power receiving unit. The power-off protection unit is used to output a control signal to the power receiving unit through the controlled node when it detects that the output voltage of the first power supply branch reaches a preset condition; wherein, the control signal is used to turn off the power receiving unit, and / or, make the power supply unit stop supplying power to the power receiving unit.

[0009] In the second aspect of the embodiments of the present application, a skin treatment device is provided, including the control circuit of the skin treatment device provided in the first aspect.

[0010] The beneficial effects of the embodiments of the present utility model compared with the prior art are as follows: The control circuit of the above skin treatment device includes: a power supply unit, a power receiving unit, and a power-off protection unit. Among them, the power supply unit includes a first power supply branch that can output voltage. One end of the power receiving unit is connected to the first power supply branch and is configured with a controlled node and an output node. One end of the power-off protection unit is connected to the first power supply branch, and the other end is connected to the controlled node on the power receiving unit. The power-off protection unit is used to output a control signal to the power receiving unit through the controlled node when it detects that the output voltage of the first power supply branch reaches a preset condition, where the control signal is used to turn off the power receiving unit, and / or make the power supply unit stop supplying power to the power receiving unit, and the power receiving unit stops working. In the above solution, the power-off protection unit is used to detect whether the output voltage of the first power supply branch reaches the preset condition, and then determine whether the skin treatment device is in a voltage abnormal state. When the output voltage of the first power supply branch reaches the preset condition, the power receiving unit can be turned off, avoiding abnormal responses of the power receiving unit in the case of abnormal output voltage, realizing reducing the risk of damage or abnormal responses of the power receiving unit when the output voltage of the skin treatment device is abnormal, and improving the stability of the skin treatment device. Description of the Drawings

[0011] Figure 1 Schematic diagram of the control circuit of the skin treatment device in the related solution;

[0012] Figure 2 Structural schematic of the control circuit of the skin treatment device provided in the embodiments of the present application Figure 1 ;

[0013] Figure 3 Structural schematic of the control circuit of the skin treatment device provided in the embodiments of the present application Figure 2 ;

[0014] Figure 4 Structural schematic of the control circuit of the skin treatment device provided in the embodiments of the present application Figure 3 ;

[0015] Figure 5 Structural schematic of the control circuit of the skin treatment device provided in the embodiments of the present application Figure 4 ;

[0016] Figure 6 Structural schematic of the control circuit of the skin treatment device provided in the embodiments of the present application Figure 5 ;

[0017] Figure 7Schematic diagram of the specific structure of the power-off protection unit in the embodiment of the present application Figure 1 ;

[0018] Figure 8 Schematic diagram of the specific circuit of the power-off protection unit in the embodiment of the present application Figure 1 ;

[0019] Figure 9 Schematic diagram of the specific structure of the power-off protection unit in the embodiment of the present application Figure 2 ;

[0020] Figure 10 Schematic diagram of the specific circuit of the power-off protection unit in the embodiment of the present application Figure 2 ;

[0021] Figure 11 Schematic diagram of the specific structure of the power-off protection unit in the embodiment of the present application Figure 3 ;

[0022] Figure 12 Schematic diagram of the specific circuit of the power-off protection unit in the embodiment of the present application Figure 3 ;

[0023] Figure 13 Schematic diagram of the structure of the control circuit of the skin treatment device provided in the embodiment Figure 6 ;

[0024] Figure 14 Schematic diagram of the structure of the control circuit of the skin treatment device provided in the embodiment Figure 7 ;

[0025] Figure 15 Schematic diagram of the specific structure of the pulse light trigger unit in the embodiment of the present application;

[0026] Figure 16 Schematic diagram of the specific circuit of the pulse light trigger unit in the embodiment of the present application;

[0027] Figure 17 Schematic diagram of the structure of a skin treatment device provided in the embodiment of the present application. Detailed implementation manners

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0032] In the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0033] Currently, most of the skin treatment devices (such as hair removal devices or skin rejuvenation devices, etc.) on the market are configured with a pulsed light trigger unit for triggering intense pulsed light to act on the skin. In actual applications, when the skin treatment device responds to a light emission operation instruction, the pulsed light trigger unit is controlled to work.

[0034] However, in the case where the output voltage of the skin treatment device is abnormal, for example, the connection between the skin treatment device and the power adapter is loose, or the plug of the power adapter is loose, etc., if the skin treatment device still responds to the light emission operation instruction, it will cause the pulsed light trigger unit to fail to work properly due to insufficient power supply, thereby increasing the risk of damage to the pulsed light trigger unit. It can be seen that the existing control circuit of the skin treatment device has a problem of poor stability.

[0035] As an example, Figure 1 shows a schematic diagram of the control circuit of the light treatment device in the related solution. As Figure 1As shown, in some existing solutions, a voltage conversion circuit may be provided in the power supply unit 510 to convert the voltage provided by the power supply and then output at least two direct currents with different voltages. When the optical processing device is suddenly disconnected from the power supply, the voltage conversion circuit in the power supply unit 510 can still output a voltage for the control unit 540 to operate, so that the control unit 540 can still continue to operate briefly when the power is just cut off. That is, the power-off time of the control unit 540 is later than that of the driving unit 530 or later than that of the pulsed light trigger unit 520. At this time, if the control unit 540 responds to the light-on instruction and outputs a driving control signal to the driving unit 530 to instruct the driving unit 530 to output a driving signal, and then drives the pulsed light trigger unit 520 to operate, the driving signal may not be able to make the pulsed light trigger unit 520 operate normally due to insufficient power supply, thereby increasing the risk of damage to the pulsed light trigger unit 520.

[0036] As another example, Figure 1 shows a schematic diagram of the control circuit of the skin treatment device in the related solution. As Figure 1 shown, in some existing solutions, in order to prevent the data stored in the control unit 540 from being lost when the skin treatment device suddenly loses power, a delayed power supply is configured for the control unit in the existing solutions. When the skin treatment device is suddenly disconnected from the power supply, the delayed power supply can supply power to the control unit 540 briefly, leaving enough shutdown time for the control unit 540 to prevent the data stored in the control unit 540 from being lost. In this way, the power-off time of the control unit 540 is later than that of the driving unit 530. At this time, if the control unit 540 responds to the light-on instruction and outputs a driving control signal to the driving unit 530 to instruct the driving unit 530 to output a driving signal, and then drives the pulsed light trigger unit 520 to operate, the driving signal may not be able to make the pulsed light trigger unit 520 operate normally due to insufficient power supply, thereby increasing the risk of damage to the pulsed light trigger unit 520.

[0037] To solve the above technical problems, an embodiment of the present application provides a control circuit for a skin treatment device, including: a power supply unit, a power receiving unit, and a power-off protection unit. Among them, the power supply unit includes a first power supply branch capable of outputting a voltage. One end of the power receiving unit is connected to the first power supply branch and is configured with a controlled node and an output node. One end of the power-off protection unit is connected to the first power supply branch, and the other end is connected to the controlled node on the power receiving unit. The power-off protection unit is configured to output a control signal to the power receiving unit through the controlled node when it detects that the output voltage of the first power supply branch reaches a preset condition, where the control signal is used to turn off the power receiving unit, and / or make the power supply unit stop supplying power to the power receiving unit, and the power receiving unit stops operating.

[0038] In the above solution, the power-off protection unit is used to detect whether the output voltage of the first power supply branch reaches a preset condition, so as to determine whether there is an abnormality in the voltage of the skin treatment device. When the output voltage of the first power supply branch reaches the preset condition, it can be determined that the skin treatment device is in an abnormal voltage state. At this time, the power receiving unit can be turned off, and / or the power supply unit can be made to stop supplying power to the power receiving unit, so as to achieve the purpose of controlling the power receiving unit to stop working, realizing that the power receiving unit is prohibited from working in the case of abnormal voltage of the skin treatment device, thereby reducing the risk of damage to the power receiving unit and improving the stability of the skin treatment device.

[0039] Refer to Figure 2 , Figure 2 which shows a schematic structural diagram of a control circuit of a skin treatment device provided by an embodiment of the present application. For the convenience of description, only the parts related to this embodiment are shown and are described in detail as follows:

[0040] In Figure 2 , the control circuit 100 of the skin treatment device includes: a power supply unit 10, a power receiving unit 20, and a power-off protection unit 30. Specifically:

[0041] The power supply unit 10 includes a first power supply branch 11, and the first power supply branch 11 is used to output voltage;

[0042] The power receiving unit 20 is connected to the first power supply branch 11, and the power receiving unit 20 is configured with a controlled node 21;

[0043] One end of the power-off protection unit 30 is connected to the first power supply branch 11, and the other end is connected to the controlled node 21 of the power receiving unit 20. The power-off protection unit 30 is used to output a control signal to the power receiving unit 20 through the controlled node 21 when it detects that the output voltage of the first power supply branch 11 reaches a preset condition; wherein, the control signal is used to turn off the power receiving unit 20, and / or make the power supply unit 10 stop supplying power to the power receiving unit 20.

[0044] In this embodiment, the power supply unit 10 can be configured in the main body of the skin treatment device, or can be configured in a power adapter connected to the main body of the device. When the power supply unit 10 is connected to the power supply 110, voltage can be output to the power receiving unit 20 through the first power supply branch 11. Here, the power supply 110 can be alternating current or direct current, and no limitation is made here.

[0045] In specific implementation, the power supply unit 10 can include a voltage conversion circuit for performing voltage conversion according to the voltage provided by the power supply 110, and then outputting a suitable voltage to the power receiving unit 20 through the first power supply branch 11.

[0046] As an example, taking the power supply 110 as the mains power supply, the power supply unit 10 can convert the alternating current output by the mains power supply into direct current, then perform voltage conversion on the direct current, and output the first direct current voltage through the first power supply branch 11. For example, when the power receiving unit 20 is a low-voltage unit such as a driving unit, a sensor unit, or a detection and identification unit, it can specifically be a direct current voltage with a voltage value in the range of 3 to 30V. When the power receiving unit 20 is a high-voltage unit such as a pulsed light trigger unit, it can specifically be a direct current voltage with a voltage value equal to or greater than 300V.

[0047] It is easy to understand that in specific implementation, the power supply unit 10 can configure an AC-DC conversion circuit to convert the alternating current into direct current, and can also configure a DC voltage conversion circuit, etc., to achieve the voltage conversion of the alternating current. Of course, in the power supply unit 10, a multi-stage voltage conversion unit can also be configured to achieve the voltage conversion of the direct current, and then output direct currents with different voltage values as working power for each unit to use. It can be understood that since both the AC-DC conversion and the DC voltage conversion can be implemented by existing conversion circuits or conversion circuits, they will not be elaborated here.

[0048] As Figure 2 shown, one end of the power receiving unit 20 is connected to the first power supply branch 11, that is, the power receiving unit 20 can be provided with working power by the power supply unit 10 through the first power supply branch 11, and then work according to the output voltage of the first power supply branch 11.

[0049] In specific implementation, the power receiving unit 20 can be a load unit, a sensor unit, a detection and identification unit, a driving unit, a main control unit, etc. When the power receiving unit 20 is a load unit, the load unit can work according to the output voltage of the first power supply branch 11. For example, the load unit can be a pulsed light trigger unit, a halogen lamp unit, a microcurrent / radio frequency output unit, or an ultrasonic output unit. When the power receiving unit 20 is a sensor unit, a detection and identification unit, a driving unit, and an active unit, it can work according to the output voltage of the first power supply branch 11 and output corresponding electrical signals. For example, when the power receiving unit 20 is a driving unit, it can output a driving signal according to the output voltage of the first power supply branch 11.

[0050] In Figure 2In the figure, one end of the power-off protection unit 30 is connected to the first power supply branch 11, and the other end of the power-off protection unit 30 is connected to the controlled node 21. The power-off protection unit 30 can turn off the power receiving unit 20 when detecting that the output voltage of the first power supply branch 11 reaches a preset condition, so that the power supply unit 10 stops supplying power to the power receiving unit 20. Here, since one end of the power-off protection unit 30 is connected to the first power supply branch 11, the output voltage of the first power supply branch 11 can be sampled. In a specific implementation, the preset condition can be a reference voltage value greater than 0 and less than the output voltage value of the first power supply branch 11, or a reference voltage value greater than 0 and greater than the output voltage value of the first power supply branch 11.

[0051] In a specific implementation, the power-off protection unit 30 can be implemented by using a sampling circuit, a comparison circuit and an electronic switch. Or it can be implemented by using a sampling circuit, a comparison circuit and a grounding loop.

[0052] For example, the sampling circuit can be used to sample the output voltage of the first power supply branch 11, and then the comparison circuit can be used to compare the sampled output voltage of the first power supply branch 11 with a preset threshold. When the output voltage of the first power supply branch 11 reaches the preset condition, a control signal is sent to the electronic switch to control the electronic switch to disconnect the path between the controlled node 21 and the power supply unit 10, thereby turning off the power receiving unit 20 and causing the power supply unit 10 to stop supplying power to the power receiving unit 20.

[0053] For another example, the sampling circuit can be used to sample the output voltage of the first power supply branch 11, and then the comparison circuit can be used to compare the sampled output voltage of the first power supply branch 11 with a preset threshold. When the output voltage of the first power supply branch 11 reaches the preset condition, a conduction signal is sent to the grounding loop. After the grounding loop is turned on, the loop between the controlled node 21 and the ground is turned on, thereby turning off the power receiving unit 20.

[0054] In some embodiments, as Figure 3 shown, the power receiving unit 20 includes a sensor unit 22. Specifically:

[0055] The enable end of the sensor unit 22 serves as the controlled node 21. The sensor unit 22 is used to output a sampling signal through the sampling signal output end and stop outputting the sampling signal through the sampling signal output end when receiving a control signal.

[0056] In specific implementation, the sensor unit 22 can be a temperature sensor unit. The temperature sensor unit samples temperature parameters and outputs the collected temperature parameters through the sampling signal output terminal. When the enable terminal of the temperature sensor unit receives a control signal, the temperature sensor is turned off, and the output of temperature parameters through the sampling signal output terminal is stopped, avoiding the output of abnormal temperature parameters by the temperature sensor unit in the case of abnormal operating voltage and improving stability.

[0057] In some embodiments, as Figure 4 shown, the power receiving unit 20 includes a load unit 23. Specifically:

[0058] The controlled terminal of the load unit 23 serves as the controlled node 21. The load unit 23 is used to operate according to the output voltage. When it receives a control signal, it blocks the input of the output voltage to the load unit 23 and stops operating.

[0059] In specific implementation, the load unit 23 can be a pulse light trigger unit. The pulse light trigger unit receives the output voltage of the first power supply branch 11 and generates pulse light according to the output voltage. When the controlled terminal of the pulse light trigger unit receives a control signal, it can block the input of the output voltage, thereby preventing the pulse light trigger unit from generating pulse light and stopping operating, avoiding abnormal operation of the pulse light trigger unit in the case of abnormal output voltage and reducing the risk of damage.

[0060] In some embodiments, as Figure 5 shown, the power receiving unit 20 includes a driving unit 24. Specifically:

[0061] The enable terminal of the driving unit 24 serves as the controlled node 21. The driving unit 24 is used to output a driving signal through the driving signal output terminal. When it receives a control signal, it stops outputting the driving signal through the driving signal output terminal.

[0062] In specific implementation, the driving unit 24 can be connected to the load unit, and its driving signal output terminal can output a driving signal, and the driving signal can drive the load unit to operate. When the enable terminal of the driving unit 24 receives a control signal, it stops outputting the driving signal through the driving signal output terminal. Consequently, the load unit cannot receive the driving signal and stops operating, avoiding the load unit from operating under abnormal voltage.

[0063] In some embodiments, as Figure 6 shown, the power receiving unit 20 includes a driving unit 24 and a control unit 25. Specifically:

[0064] The driving unit 24 is configured to output a driving signal through the driving signal output terminal when it receives a driving control signal output by the control unit 25;

[0065] The control unit 25 is used to be connected to the drive unit 24. A drive control node is configured between the drive unit 24 and the control unit 25, and the drive control node serves as the controlled node 21. The control unit 25 is used to output a drive control signal to the drive unit 24 through the drive control node, and when a control signal is received at the drive control node, it is opened by the power-off protection unit 30.

[0066] As Figure 6 shown, one end of the drive unit 24 is connected to the first power supply branch 11, that is, the drive unit 24 can be supplied with working power by the power supply unit 10 through the first power supply unit 11. Moreover, the other end of the drive unit 24 can be connected to the load unit, and the drive unit 24 can output a drive signal according to the drive control signal output by the control unit 25. In a specific implementation, the drive unit 24 can be implemented by building a corresponding drive circuit using an existing drive chip. Among them, the drive chip can be controlled by the drive control signal output by the control unit 25, and then output a drive signal for driving the load unit. Here, the drive signal can specifically be an electrical signal including high and low levels.

[0067] The control unit 25 is connected to the drive unit 24, and a drive control node is configured between the drive unit 24 and the control unit 25, and the drive control node can serve as the controlled node 21. Based on this, the control unit 25 can send a drive control signal to the drive unit 24, and then can make the drive unit 24 output a drive signal to the load unit according to the drive control signal to make it work.

[0068] Figure 7 shows the specific structural schematic of the power-off protection unit in the embodiment of the present application Figure 1 As Figure 7 shown, based on any of the above embodiments, as an embodiment, the power-off protection unit 30 includes: a sampling unit 31, a first switch unit 32, and a second switch unit 33.

[0069] The sampling unit 31 is connected to the first power supply branch 11 and is used to sample the output voltage of the first power supply branch 11. The first switch unit 32 is connected between the sampling unit 31 and the second switch unit 33. The first switch unit 32 is used to output a conduction signal to the second switch unit 33 when the output voltage of the first power supply branch 11 is less than a preset threshold. The second switch unit 33 is connected between the controlled node 21 and the ground and is used to conduct the path between the controlled node 21 and the ground according to the conduction signal to turn off the power receiving unit 20.

[0070] When the output voltage of the first power supply branch 11 is greater than or equal to a preset threshold, the sampling unit 31 and the second switch unit 33 are not conducted. The second switch unit 33 is connected between the controlled node 21 and the ground. When the sampling unit 31 and the second switch unit 33 are not conducted, the connection between the controlled node 21 and the ground is also not conducted, and the power receiving unit 20 remains on.

[0071] In a specific implementation, the sampling unit 31 can be implemented by building a corresponding sampling circuit using a sampling circuit, and is used to sample the output voltage of the first power supply branch 11 of the power supply unit 10. Both the first switch unit 32 and the second switch unit 33 can be constructed with switching tubes to build corresponding switching circuits.

[0072] As an example, the first switch unit 32 is in an open state when the sampling unit 31 samples that the output voltage of the first power supply branch 11 is equal to or greater than a preset threshold, and switches to a conducting state when the sampling unit 31 samples that the output voltage of the first power supply branch 11 is less than the preset threshold, and then outputs a conducting signal to the second switch unit 33 to control the second switch unit 33 to conduct the path between the controlled node 21 and the ground, so that the output voltage of the controlled node 21 flows to the ground, and further stops the power supply unit 10 from supplying power to the power receiving unit 20 and turns off the power receiving unit 20.

[0073] As an example, the first switch unit 32 is configured to output a high-level signal as a conducting signal when the output voltage of the first power supply branch 11 is less than a preset threshold. The second switch unit 33 is configured to conduct the path between the controlled node 21 and the ground according to the high-level signal and output a low-level signal to the controlled node 21 to turn off the power receiving unit 20. That is, when the output voltage of the first power supply branch 11 is less than the preset threshold, the first switch unit 32 switches to a conducting state and outputs a high-level signal. The second switch unit 33 receives the high-level signal, then conducts the path between the controlled node 21 and the ground, makes the output voltage of the controlled node 21 flow to the ground, outputs a low-level signal, and turns off the power receiving unit 20.

[0074] Figure 8 Shows the specific circuit schematic of the power-off protection unit in the embodiment of the present application Figure 1 . Such as Figure 8As shown, as an embodiment, the sampling unit 31 includes: a first resistor R1, a second resistor R2, a third resistor R3, a capacitor C, and a diode D1. The first end of the first resistor R1 and the first end of the second resistor R2 are commonly connected to the first power supply branch 11. The second end of the first resistor R1 and the first end of the third resistor R3 are commonly connected to the first end of the diode D1. The second end of the second resistor R2 is connected to the controlled end of the first switch unit 32. The second end of the third resistor R3 and the first end of the capacitor C are commonly grounded. The second end of the capacitor C is connected to the second end of the diode D1 to form a potential node P1 for connecting the first potential end of the first switch unit 32.

[0075] As Figure 8 shown, as an embodiment, the first switch unit 32 includes: a first switch transistor Q1, a fourth resistor R4, and a fifth resistor R5. The controlled end of the first switch transistor Q1 is the controlled end of the first switch unit 32. The first high potential end of the first switch transistor Q1 is the first potential end of the first switch unit 32. The low potential end of the first switch transistor Q1 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5 to form a conduction signal output node P2. The second end of the fifth resistor R5 is grounded.

[0076] As Figure 8 shown, as an embodiment, the second switch unit 33 includes: a second switch transistor Q2 and a sixth resistor R6. The controlled end of the second switch transistor Q2 is connected to the conduction signal output node P2. The high potential end of the second switch transistor Q2 is connected to the first end of the sixth resistor R6. The second end of the sixth resistor R6 is connected to the controlled node 21. The low potential end of the second switch transistor Q2 is grounded.

[0077] In this embodiment, the capacitor C in the sampling unit 31 is charged according to the output voltage of the first power supply branch 11. Under the action of the diode D1 and the capacitor C, when the output voltage of the first power supply branch 11 is normal, the voltage of the potential node P1 remains unchanged. When the output voltage of the first power supply branch 11 is less than a preset threshold, the voltage of the potential node P1 changes, causing the first switch transistor Q1 in the first switch unit 32 to conduct, and then a conduction signal is output through the conduction signal output node P2, further controlling the second switch unit 33 to conduct the path between the controlled node 21 and the ground, so that the output voltage of the controlled node 21 flows to the ground, and further causing the power supply unit 10 to stop supplying power to the power receiving unit 20 and turning off the power receiving unit 20.

[0078] Figure 9 shows the specific structural schematic of the power-off protection unit in the embodiment of the present application Figure 2 . As Figure 9 shown, based on any of the above embodiments, as an embodiment, the power-off protection unit 30 includes: a comparison unit 34 and a path unit 35.

[0079] The comparison unit 34 is connected to the first power supply branch 11, and is used to sample the output voltage of the first power supply branch 11 to obtain a sampled voltage, and when the sampled voltage is less than a preset threshold, an on signal is output.

[0080] The path unit 35 is connected to the comparison unit 34 and is connected between the controlled node 21 and the ground, and is used to conduct the path between the controlled node 21 and the ground according to the on signal, so that the power supply unit 10 stops supplying power to the power receiving unit 20.

[0081] In this embodiment, the comparison unit 34 can be implemented by building a corresponding comparison circuit with a comparator. Among them, the comparator can use the output voltage of the first power supply branch 11 as one input and a preset reference voltage as the other input. Here, the reference voltage corresponds to the preset threshold.

[0082] It can be understood that the comparison unit 34 can also prohibit the output of the on signal when the sampled voltage is equal to or greater than the preset threshold. That is, it prohibits controlling the path unit 35 to conduct, disconnects the path between the controlled node 21 and the ground, and enables the power supply unit 10 to supply power to the power receiving unit 20.

[0083] Figure 10 The specific circuit diagram of the power-off protection unit in the embodiment of the present application is shown Figure 2 . As Figure 10 shown, as an embodiment, the comparison unit 34 includes: a comparator D2.

[0084] The first input terminal of the comparator D2 is connected to the first power supply branch 11, the second input terminal of the comparator D2 is used to input a preset reference voltage Vref, and the output terminal of the comparator D2 is connected to the path unit 35.

[0085] The path unit 35 includes: a third switching transistor Q3 and a seventh resistor R7;

[0086] The controlled terminal of the third switching transistor Q3 is connected to the output terminal of the comparator D2, the high-potential terminal of the third switching transistor Q3 is connected to the first terminal of the seventh resistor R7, the second terminal of the seventh resistor R7 is connected to the controlled node 21, and the low-potential terminal of the third switching transistor Q3 is grounded.

[0087] In this embodiment, the second input terminal of comparator D2 is used to input a preset reference voltage Vref. Here, the voltage value of the preset reference voltage Vref can be equal to the output voltage value of the first power supply branch 11 when the power supply unit 10 is normally connected to the power supply 110. The first input terminal of comparator D2 is used to sample the output voltage of the first power supply branch 11. When the sampled voltage obtained by sampling is less than the preset reference voltage Vref, it can be determined that the output voltage value of the first power supply branch 11 is less than the preset threshold, and then a conduction signal is output through the output terminal of comparator D2. The third switch tube Q3 in the path unit 35 conducts the path between the controlled node 21 and the ground under the action of this conduction signal, so that the output voltage of the controlled node 21 flows to the ground, and then the power supply unit 10 stops supplying power to the power receiving unit 20, and the power receiving unit 20 is turned off.

[0088] Figure 11 The specific structural schematic diagram of the power-off protection unit in the embodiment of the present application is shown Figure 3 . As Figure 11 shown, when the power receiving unit 20 includes a driving unit 24 and a control unit 25, as an embodiment, the power-off protection unit 30 includes: an arithmetic unit 36.

[0089] The first input terminal 361 of the arithmetic unit 36 is connected to the first power supply branch 11 to input the output voltage of the first power supply branch. The second input terminal 362 of the arithmetic unit 36 is connected to the controlled node 21 to input a drive control signal. The output terminal of the arithmetic unit 36 is connected to the driving unit 24. The arithmetic unit 36 is configured to prohibit outputting the drive control signal to the driving unit 24 when it detects that the output voltage of the first power supply branch 11 is less than the preset threshold.

[0090] In this embodiment, the arithmetic unit 36 in the power-off protection unit 30 is connected in series between the driving unit 24 and the controlled node 21. The arithmetic unit 36 takes the output voltage of the first power supply branch 11 and the drive control signal as inputs, and only when the first power supply branch 11 normally outputs voltage and receives the drive control signal, will it transmit the drive control signal to the driving unit 24.

[0091] Figure 12 The specific circuit schematic diagram of the power-off protection unit in the embodiment of the present application is shown Figure 3 . As Figure 10 shown, as an embodiment, the arithmetic unit 36 includes an AND gate U1.

[0092] The first input terminal in1 of the AND gate U1 is the first input terminal of the arithmetic unit 36, the second input terminal in2 of the AND gate U1 is the second input terminal of the arithmetic unit 36, and the output terminal out of the AND gate U1 is the output terminal of the arithmetic unit 36.

[0093] It can be understood that when the first input terminal in1 of the AND gate U1 inputs the normal output voltage of the first power supply branch 11, the value of the first input terminal in1 of the AND gate U1 is "1". When the voltage input to the first input terminal in1 of the AND gate U1 is not equal to the normal output voltage of the first power supply branch 11, the value of the first input terminal in1 of the AND gate U1 is "0". At this time, the value of the output terminal out of the AND gate U1 is "0", and the driving signal is prohibited from being output to the driving unit 24 through the AND gate U1.

[0094] Here, only when the value of the first input terminal in1 of the AND gate U1 is "1" and the value of the second input terminal in2 of the AND gate U1 is also "1", the value of the output terminal out of the AND gate U1 is "1". At this time, the driving signal can be output to the driving unit 24 through the AND gate U1. That is, when the first input terminal in1 of the AND gate U1 inputs the normal output voltage of the first power supply branch 11 and the second input terminal in2 of the AND gate U1 inputs the driving control signal, the value of the first input terminal in1 of the AND gate U1 is "1", the value of the second input terminal in2 of the AND gate U1 is also "1", and at this time, the value of the output terminal out of the AND gate U1 is "1", and the driving signal can be output to the driving unit 24 through the AND gate U1.

[0095] As Figure 13 shown, when the power receiving unit includes the driving unit 24, the control circuit of the skin treatment device further includes a pulsed light trigger unit 40. Specifically:

[0096] The power supply unit 10 further includes a second power supply branch 12, and the output voltage of the first power supply branch 11 is less than the output voltage of the second power supply branch 12;

[0097] One end of the pulsed light trigger unit 40 is connected to the second power supply branch 12, and the other end is connected to the driving unit 24. The pulsed light trigger unit 40 is configured to output pulsed light based on the electric energy provided by the second power supply branch 12 when receiving the driving signal output by the driving unit 24.

[0098] As Figure 14 shown, when the power receiving unit includes the driving unit 24 and the control unit 25, the control circuit of the skin treatment device further includes a pulsed light trigger unit 40. Specifically:

[0099] The power supply unit 10 further includes a second power supply branch 12, and the output voltage of the first power supply branch 11 is less than the output voltage of the second power supply branch 12;

[0100] The pulsed light trigger unit 40 is connected to the second power supply branch 12 at one end and to the drive unit 24 at the other end. The pulsed light trigger unit 40 is configured to output pulsed light based on the electrical energy provided by the second power supply branch 12 when receiving a drive signal output by the drive unit 24.

[0101] Figure 15 FIG. shows a specific structural schematic diagram of the pulsed light trigger unit in an embodiment of the present application. As an embodiment, in Figure 15 the pulsed light trigger unit 40 includes: an energy storage unit 41, a light emitting unit 42, and a switching unit 43. Specifically:

[0102] The energy storage unit 41 is connected to the second power supply branch 12 and is configured to store electrical energy based on the output voltage of the second power supply branch 12. The light emitting unit 42 is connected to the energy storage unit 41 at one end. The switching unit 43 is connected to the drive unit 24 and is connected between the light emitting unit 42 and the ground, and is configured to conduct the path between the light emitting unit 42 and the ground according to the drive signal, so that the light emitting unit 42 is powered by the energy storage unit 41, and when the path between the light emitting unit 42 and the ground is conducted, pulsed light is triggered.

[0103] In specific implementation, the energy storage unit 41 may specifically adopt an energy storage circuit composed of energy storage elements. For example, at least one capacitor is used to store electrical energy based on the output voltage of the second power supply branch 12. Of course, according to actual requirements, two or more capacitors may be connected in parallel to form the energy storage unit 41 and then store electrical energy based on the output voltage of the second power supply branch 12.

[0104] It can be understood that when the power receiving unit 20 includes a drive unit 24 and a control unit 25, the Figure 15 power receiving unit 20 in can be replaced with the corresponding form.

[0105] Figure 16 FIG. shows a specific circuit schematic diagram of the pulsed light trigger unit in this embodiment. As an embodiment, in Figure 16 the light emitting unit 42 includes a lamp tube D and a trigger L1. The lamp tube D and the trigger L1 are commonly connected in parallel between the energy storage unit 41 and the switching unit 43, and both the lamp tube D and the trigger L1 are supplied with operating voltage by the energy storage unit 41. The trigger L1 is configured to apply a target voltage to the lamp tube D according to the operating voltage to ionize the gas in the lamp tube D. The lamp tube D is configured to trigger pulsed light according to the operating voltage.

[0106] Such as Figure 16As shown, in this embodiment, the energy storage unit 41 may specifically include a capacitor C1. The first end of the capacitor C1 is used to connect to the second power supply branch 12, and the second end of the capacitor C1 is used to connect to the lamp tube D and the trigger L1. The capacitor C1 can store electrical energy based on the output voltage of the second power supply branch 12, and provide operating voltages to the lamp tube D and the trigger L1 respectively through the connection node with the lamp tube D and the trigger L1.

[0107] As Figure 16 shown, as an embodiment, the switch unit 43 includes a switching transistor Q. The controlled end of the switching transistor Q is connected to the driving unit 24, the first potential end of the switching transistor Q is connected to the light emitting unit 42, and the second potential end of the switching transistor Q is grounded.

[0108] In specific implementation, the switching transistor Q can be an IGBT transistor. As an example, in specific implementation, the lamp tube D can be a xenon lamp tube. The trigger L1 applies a target voltage to the lamp tube D according to the operating voltage, thereby ionizing the xenon gas in the lamp tube D. Subsequently, the driving unit 24 outputs a driving signal to the switching transistor Q, thereby controlling the switching transistor Q to conduct and disconnect the path between the light emitting unit 42 and the ground. Here, when the switching transistor Q conducts the path between the light emitting unit 42 and the ground, the lamp tube D and the trigger L1 are connected in parallel between the capacitor C1 and the ground, and then trigger pulsed light according to the operating voltage. When the switching transistor Q disconnects the path between the light emitting unit 42 and the ground, both the lamp tube D and the trigger L1 are in an open circuit state, and then stop triggering pulsed light.

[0109] Figure 17 shows a schematic structural diagram of a skin treatment device provided by an embodiment of the present application. As Figure 17 shown, the skin treatment device 200 includes the control circuit 100 of the skin treatment device provided by any one of the embodiments of the present application.

[0110] It can be understood that in Figure 17 the shown embodiment, since the improvement points and specific implementation manners related to the present application have been described in detail in Figures 2 to 16 the corresponding embodiment, they will not be elaborated here.

[0111] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0112] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A control circuit for a skin treatment device, characterized in that, The control circuit includes: A power supply unit, including a first power supply branch for outputting a voltage; A power receiving unit connected to the first power supply branch, and the power receiving unit is configured with a controlled node; A power-off protection unit, with one end connected to the first power supply branch and the other end connected to the controlled node of the power receiving unit. The power-off protection unit is used to output a control signal to the power receiving unit through the controlled node when it detects that the output voltage of the first power supply branch reaches a preset condition. Wherein, the control signal is used to turn off the power receiving unit and / or stop the power supply unit from supplying power to the power receiving unit.

2. The control circuit of the skin treatment device according to claim 1, characterized in that The power receiving unit includes a sensor unit; The enable terminal of the sensor unit serves as the controlled node; The sensor unit is used to output a sampling signal through a sampling signal output terminal and stop outputting the sampling signal through the sampling signal output terminal when receiving the control signal.

3. The control circuit of the skin treatment device according to claim 1, characterized in that, The power receiving unit includes a load unit; The controlled terminal of the load unit serves as the controlled node; The load unit is used to operate according to the output voltage, block the input of the output voltage and stop operating when receiving the control signal.

4. The control circuit of the skin treatment device according to claim 1, wherein The power receiving unit includes a driving unit; The enable terminal of the driving unit serves as the controlled node; The driving unit is used to output a driving signal through a driving signal output terminal and stop outputting the driving signal through the driving signal output terminal when receiving the control signal.

5. The control circuit of the skin treatment device according to claim 1, characterized in that, The power receiving unit includes a driving unit and a control unit; The driving unit is used to output a driving signal through a driving signal output terminal when receiving a driving control signal output by the control unit; The control unit is connected to the driving unit, and a driving control node is configured between the driving unit and the control unit. The driving control node serves as the controlled node. The control unit is used to output the driving control signal to the driving unit through the driving control node, and is short-circuited by the power-off protection unit when the driving control node receives the control signal.

6. The control circuit of the skin treatment device according to any one of claims 2-5, characterized in that, The power-off protection unit includes: a sampling unit, a first switch unit and a second switch unit; The sampling unit is connected to the first power supply branch for sampling the output voltage of the first power supply branch; The first switch unit is connected between the sampling unit and the second switch unit. The first switch unit is used to output a conduction signal to the second switch unit when the output voltage of the first power supply branch is less than a preset threshold; The second switch unit is connected between the controlled node and the ground, and is used to conduct the path between the controlled node and the ground according to the conduction signal to turn off the power receiving unit; The first switch unit is further used to prevent the sampling unit and the second switch unit from conducting when the output voltage of the first power supply branch is greater than or equal to the preset threshold; The second switch unit is connected between the controlled node and the ground. When the sampling unit and the second switch unit are not conducting, the connection between the controlled node and the ground is not conducting, and the power receiving unit is turned on.

7. The control circuit of the skin treatment device according to claim 6, wherein The first switch unit is configured to output a high-level signal as the conduction signal when the output voltage of the first power supply branch is less than a preset threshold. The second switch unit is configured to, according to the high-level signal, conduct the path between the controlled node and the ground and output a low-level signal to the controlled node to turn off the power receiving unit.

8. The control circuit of the skin treatment device according to claim 6, characterized in that, The sampling unit includes: a first resistor, a second resistor, a third resistor, a capacitor, and a diode. The first end of the first resistor and the first end of the second resistor are commonly connected to the first power supply branch. The second end of the first resistor and the first end of the third resistor are commonly connected to the first end of the diode. The second end of the second resistor is connected to the controlled end of the first switch unit. The second end of the third resistor and the first end of the capacitor are commonly grounded. The second end of the capacitor is connected to the second end of the diode to form a potential node for connecting to the first potential end of the first switch unit.

9. The control circuit of the skin treatment device according to claim 8, characterized in that, The first switch unit includes: a first switch transistor, a fourth resistor, and a fifth resistor. The controlled end of the first switch transistor is the controlled end of the first switch unit. The first high-potential end of the first switch transistor is the first potential end of the first switch unit. The low-potential end of the first switch transistor is connected to the first end of the fourth resistor. The second end of the fourth resistor and the first end of the fifth resistor are connected to form a conduction signal output node, and the second end of the fifth resistor is grounded.

10. The control circuit of the skin treatment device according to claim 9, wherein, The second switch unit includes: a second switch transistor and a sixth resistor. The controlled end of the second switch transistor is connected to the conduction signal output node. The high-potential end of the second switch transistor is connected to the first end of the sixth resistor. The second end of the sixth resistor is connected to the controlled node. The low-potential end of the second switch transistor is grounded.

11. The control circuit of the skin treatment device according to claim 6, characterized in that, The power-off protection unit includes: a comparison unit and a path unit. The comparison unit is connected to the first power supply branch and is configured to sample the output voltage of the first power supply branch to obtain a sampled voltage, and output a conduction signal when the sampled voltage is less than the preset threshold. The path unit is connected to the comparison unit and is connected between the controlled node and the ground, and is configured to, according to the conduction signal, conduct the path between the controlled node and the ground to turn off the power receiving unit.

12. The control circuit of the skin treatment device according to claim 11, wherein, The comparison unit includes: a comparator. The first input terminal of the comparator is connected to the first power supply branch. The second input terminal of the comparator is used to input a preset reference voltage. The output terminal of the comparator is connected to the path unit. The path unit includes: a second switch transistor and a sixth resistor. The controlled end of the second switch transistor is connected to the output terminal of the comparator. The high-potential end of the second switch transistor is connected to the first end of the sixth resistor. The second end of the sixth resistor is connected to the controlled node. The low-potential end of the second switch transistor is grounded.

13. The control circuit of the skin treatment device according to claim 5, characterized in that, The power-off protection unit includes: an arithmetic unit. The first input terminal of the arithmetic unit is connected to the first power supply branch to input the output voltage of the first power supply branch; The second input terminal of the arithmetic unit is connected to the drive control node to input the drive control signal; The output terminal of the arithmetic unit is connected to the drive unit. The arithmetic unit is configured to prohibit outputting the drive control signal to the drive unit when it detects that the output voltage of the first power supply branch is less than a preset threshold.

14. The control circuit of the skin treatment device according to claim 13, characterized in that, The arithmetic unit includes an AND gate; The first input terminal of the AND gate is the first input terminal of the arithmetic unit, the second input terminal of the AND gate is the second input terminal of the arithmetic unit, and the output terminal of the AND gate is the output terminal of the arithmetic unit.

15. The control circuit of the skin treatment device according to claim 4 or 5, characterized in that, The control circuit further includes: a pulse light trigger unit; The power supply unit further includes a second power supply branch, and the output voltage of the first power supply branch is less than the output voltage of the second power supply branch; The pulse light trigger unit, one end is connected to the second power supply branch, and the other end is connected to the drive unit. The pulse light trigger unit is configured to output pulse light based on the electric energy provided by the second power supply branch when receiving the drive signal output by the drive unit.

16. The control circuit of the skin treatment device according to claim 15, characterized in that, The pulse light trigger unit includes: An energy storage unit, connected to the second power supply branch, for storing electric energy based on the output voltage of the second power supply branch; A light emitting unit, one end is connected to the energy storage unit; A switch unit, connected to the power receiving unit and connected between the light emitting unit and the ground, for conducting the path between the light emitting unit and the ground according to the drive signal output by the power receiving unit, so that the light emitting unit is powered by the energy storage unit, and when the path between the light emitting unit and the ground is conducted, triggering pulse light.

17. The control circuit of the skin treatment device according to claim 16, wherein, The light emitting unit includes a lamp tube and a trigger; The lamp tube and the trigger are commonly connected in parallel between the energy storage unit and the switch unit, and both the lamp tube and the trigger are provided with a working voltage by the energy storage unit; The trigger is configured to apply a target voltage to the lamp tube according to the working voltage to ionize the gas in the lamp tube; The lamp tube is configured to trigger pulse light according to the working voltage.

18. The control circuit of the skin treatment device according to claim 16, characterized in that, The switch unit includes a switching tube; The controlled terminal of the switching tube is connected to the power receiving unit, the first potential terminal of the switching tube is connected to the light emitting unit, and the second potential terminal of the switching tube is grounded.

19. A skin treatment device, characterized in that, The skin treatment device is a hair removal device or a skin rejuvenation device, and includes the control circuit of the skin treatment device according to any one of claims 1 to 18.

Images