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 pulse light triggering unit, a driving unit, a control unit and a power-off triggering unit. The power failure trigger unit is used for detecting the output voltage of the first power supply branch, power failure detection of the skin treatment device is achieved, when the output voltage of the first power supply branch is smaller than a preset threshold value, a first trigger signal can be output to the control unit, and the control unit stops outputting a drive control signal to the drive unit; therefore, the driving unit is prevented from outputting the driving signal to the pulse light triggering unit, the pulse light triggering unit is stopped from being driven under the condition that the skin treatment device is powered down, the risk that the pulse light triggering unit is damaged is reduced, and the stability of the skin treatment device is improved.

Description

Technical Field

[0001] The present application belongs to the field of circuit protection of skin treatment devices, and in particular, relates to a skin treatment device and a control circuit thereof. Background Art

[0002] At present, most skin treatment devices on the market (such as hair removal devices or skin rejuvenation devices, etc.) are equipped with a pulse light trigger unit for triggering strong pulse light to act on the skin. In actual applications, when the skin treatment device responds to a lighting operation instruction, it is necessary to use a driving unit to send a driving signal to the pulse light trigger unit, thereby controlling the pulse light trigger unit to work.

[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, if the skin treatment device still responds to the lighting operation instruction and uses the driving unit to send a driving signal to the pulse light trigger unit, the driving signal will not be able to make the pulse light trigger unit work normally due to insufficient power supply, thereby increasing the risk of damage to the pulse light trigger unit. It can be seen that the existing skin treatment device control circuit has the problem of poor stability. Utility Model Content

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

[0005] A first aspect of an embodiment of the present application provides a control circuit of a skin treatment device, comprising:

[0006] A power supply unit, comprising a first power supply branch and a second power supply branch, wherein an output voltage of the first power supply branch is lower than an output voltage of the second power supply branch;

[0007] A pulse light trigger unit connected to the second power supply branch;

[0008] A driving unit, one end of which is connected to the first power supply branch and the other end of which is connected to the pulse light triggering unit, and is used to output a driving signal according to a driving control signal;

[0009] A control unit connected to the driving unit, the control unit being configured to stop outputting a driving control signal to the driving unit upon receiving a first trigger signal;

[0010] A power-off trigger unit has one end connected to the first power supply branch and the other end connected to the control unit. The power-off trigger unit is used to output a first trigger signal to the control unit when it detects that the output voltage of the first power supply branch is less than a reference voltage value.

[0011] A second aspect of an embodiment of the present application provides a skin treatment device, which is a hair removal device or a skin rejuvenation device, and includes a control circuit of the skin treatment device provided by the first aspect.

[0012] Compared with the prior art, the embodiment of the utility model has the following beneficial effects: the control circuit of the above-mentioned skin treatment device includes: a power supply unit, a pulse light trigger unit, a driving unit, a control unit and a power-off trigger unit. Among them, the power supply unit includes a first power supply branch and a second power supply branch. Since 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 is connected to the second power supply branch, so that the pulse light trigger unit can trigger the light pulse based on the output voltage of the second power supply branch and the driving signal. One end of the driving unit is connected to the first power supply branch, and the other end is connected to the pulse light trigger unit. The driving unit can output a driving signal to the pulse light trigger unit according to the driving control signal. The control unit is connected to the driving unit, and the control unit is used to stop outputting the driving control signal to the driving unit when receiving the first trigger signal. One end of the power-off trigger unit is connected to the first power supply branch, and the other end is connected to the control unit. The power-off trigger unit is used to output a first trigger signal to the control unit when it is detected that the output voltage of the first power supply branch is less than a preset threshold. The above scheme uses the power-off trigger unit to detect the output voltage of the first power supply branch to realize power-off detection of the skin treatment device. When the output voltage of the first power supply branch is less than a preset threshold, the scheme can output a first trigger signal to the control unit to stop the control unit from outputting the drive control signal to the drive unit, thereby preventing the drive unit from outputting the drive signal to the pulse light trigger unit. In this way, when the skin treatment device loses power, the pulse light trigger unit is stopped from being driven, thereby reducing the risk of damage to the pulse light trigger unit and improving the stability of the skin treatment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of a control circuit of a skin treatment device in a related scheme;

[0014] Figure 2 A schematic diagram of the structure of a control circuit of a skin treatment device provided in an embodiment of the present application;

[0015] Figure 3 The specific structure of the power-off trigger unit in the embodiment of the present application is shown in FIG. Figure 1 ;

[0016] Figure 4 The specific circuit diagram of the comparison unit in the embodiment of the present application is as follows: Figure 1 ;

[0017] Figure 5 The specific circuit diagram of the comparison unit in the embodiment of the present application is as follows: Figure 2 ;

[0018] Figure 6 The specific structure of the power-off trigger unit in the embodiment of the present application is shown in FIG. Figure 2 ;

[0019] Figure 7 A specific circuit diagram of the computing unit in the embodiment of the present application;

[0020] Figure 8 This is a specific circuit diagram of the sampling unit in the embodiment of the present application;

[0021] Fig. 9 A schematic diagram of the structure of a control circuit of a skin treatment device provided by another embodiment of the present application;

[0022] Fig.10 This is a schematic diagram of the specific structure of the pulse light trigger unit in the embodiment of the present application;

[0023] Fig.11 This is a specific circuit diagram of the pulse light trigger unit in the embodiment of the present application;

[0024] Fig.12 This is a schematic diagram of the structure of a skin treatment device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with 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.

[0026] 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.

[0027] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] At present, most skin treatment devices on the market (such as hair removal devices or skin rejuvenation devices, etc.) are equipped with a pulse light trigger unit for triggering strong pulse light to act on the skin. In actual applications, when the skin treatment device responds to a lighting operation instruction, it is necessary to use a driving unit to send a driving signal to the pulse light trigger unit, thereby controlling the pulse light trigger unit to work.

[0030] 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, if the skin treatment device still responds to the lighting operation instruction and uses the driving unit to send a driving signal to the pulse light trigger unit, the driving signal will not be able to make the pulse light trigger unit work normally due to insufficient power supply, thereby increasing the risk of damage to the pulse light trigger unit. It can be seen that the existing skin treatment device control circuit has the problem of poor stability.

[0031] As an example, Figure 1 FIG. 2 shows a schematic diagram of a control circuit of a light processing device in a related solution. Figure 1 As shown, in some existing solutions, a voltage conversion circuit may be provided in the power supply unit 10 for converting the voltage provided by the power supply, and then outputting at least two direct currents with different voltages. When the light processing device is suddenly disconnected from the power supply, the voltage conversion circuit in the power supply unit 10 can still output voltage for the control unit 40 to work, so that when the power is just cut off, the control unit 40 can still continue to work for a short time. That is, the power-off time of the control unit 40 is later than the power-off time of the drive unit 30, or later than the power-off time of the pulse light trigger unit 20. At this time, if the control unit 40 responds to the lighting instruction and outputs a drive control signal to the drive unit 30 to instruct the drive unit 30 to output a drive signal, and then drives the pulse light trigger unit 20 to work, the drive signal will not be able to make the pulse light trigger unit 20 work normally due to insufficient power supply, thereby increasing the risk of damage to the pulse light trigger unit 20.

[0032] As another example, Figure 1 FIG. 2 shows a schematic diagram of a control circuit of a skin treatment device in a related solution. Figure 1As shown, in some existing solutions, in order to avoid the loss of data stored in the control unit 40 when the skin treatment device suddenly loses power, a delayed power supply is configured for the control unit in the existing solution. When the skin treatment device is suddenly disconnected from the power supply, the delayed power supply can briefly power the control unit 40, and reserve enough shutdown time for the control unit 40 to avoid the loss of data stored in the control unit 40. In this way, the power-off time of the control unit 40 is later than the power-off time of the driving unit 30. At this time, if the control unit 40 responds to the lighting instruction and outputs a driving control signal to the driving unit 30 to instruct the driving unit 30 to output a driving signal, thereby driving the pulse light trigger unit 20 to work, the driving signal will not be able to make the pulse light trigger unit 20 work normally due to insufficient power supply, thereby increasing the risk of damage to the pulse light trigger unit 20.

[0033] In order to solve the above technical problems, the embodiment of the present application provides a control circuit of a skin treatment device, including: a power supply unit, a pulse light trigger unit, a driving unit, a control unit and a power-off trigger unit. Among them, the power supply unit includes a first power supply branch and a second power supply branch. Since 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 is connected to the second power supply branch, so that the pulse light trigger unit can trigger the light pulse based on the output voltage of the second power supply branch and the driving signal. One end of the driving unit is connected to the first power supply branch, and the other end is connected to the pulse light trigger unit. The driving unit can output a driving signal to the pulse light trigger unit according to the driving control signal. The control unit is connected to the driving unit, and the control unit is used to stop outputting the driving control signal to the driving unit when receiving the first trigger signal. One end of the power-off trigger unit is connected to the first power supply branch, and the other end is connected to the control unit. The power-off trigger unit is used to output a first trigger signal to the control unit when it detects that the output voltage of the first power supply branch is less than a preset threshold.

[0034] The above scheme uses the power-off trigger unit to detect the output voltage of the first power supply branch to realize power-off detection of the skin treatment device. When the output voltage of the first power supply branch is less than a preset threshold, the scheme can output a first trigger signal to the control unit to stop the control unit from outputting the drive control signal to the drive unit, thereby preventing the drive unit from outputting the drive signal to the pulse light trigger unit. In this way, when the skin treatment device loses power, the pulse light trigger unit is stopped from being driven, thereby reducing the risk of damage to the pulse light trigger unit and improving the stability of the skin treatment device.

[0035] See also Figure 2 , Figure 2 The following is a schematic diagram showing the structure of a control circuit of a skin treatment device provided by an embodiment of the present application. For ease of explanation, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0036] exist Figure 2 In the embodiment, the control circuit 100 of the skin treatment device includes: a power supply unit 10, a pulse light trigger unit 20, a drive unit 30, a control unit 40 and a power-off trigger unit 50. Specifically:

[0037] The power supply unit 10 includes a first power supply branch 11 and a second power supply branch 12 , and the output voltage of the first power supply branch 11 is lower than the output voltage of the second power supply branch 12 .

[0038] The pulse light triggering unit 20 is connected to the second power supply branch 12 .

[0039] The driving unit 30 has one end connected to the first power supply branch 11 and the other end connected to the pulse light triggering unit 20, and is used to output a driving signal according to a driving control signal.

[0040] The control unit 40 is connected to the driving unit 30 , and is used for stopping outputting the driving control signal to the driving unit 30 when receiving the first trigger signal.

[0041] The power-off trigger unit 50 has one end connected to the first power supply branch 11 and the other end connected to the control unit 40. The power-off trigger unit 50 is used to output a first trigger signal to the control unit when it detects that the output voltage of the first power supply branch 11 is less than a reference voltage value.

[0042] In this embodiment, the power supply unit 10 can be configured in the host body of the skin treatment device, or in a power adapter connected to the host body. Since the power supply unit 10 includes a first power supply branch 11 and a second power supply branch 12, when the power supply unit 10 is connected to the power supply 110, at least two voltages can be output through the first power supply branch 11 and the second power supply branch 12. Here, the power supply 110 can be alternating current or direct current, which is not limited here. Since the output voltage of the first power supply branch 11 is less than the output voltage of the second power supply branch 12, in a specific implementation, each unit can be connected to the first power supply branch 11 or to the second power supply branch 12 according to the working voltage requirements of each unit in the control circuit 100 of the skin treatment device.

[0043] In all embodiments of the present application, since the pulse light trigger unit 20 is used to output intense pulse light, the pulse light trigger unit 20 can be connected to the second power supply branch 12. The operating voltage required by the drive unit 30, the control unit 40 and the power-off trigger unit 50 is relatively small, so the drive unit 30, the control unit 40 and the power-off trigger unit 50 can all be connected to the first power supply branch 11. In a specific implementation, the power supply unit 10 may include a voltage conversion circuit for performing voltage conversion according to the voltage provided by the power supply 110, and then outputting at least two voltages through the first power supply branch 11 and the second power supply branch 12.

[0044] As an example, taking the case where the power source 110 is a city power supply, the power supply unit 10 can convert the alternating current output by the city power supply to obtain direct current, then perform voltage conversion on the direct current, and then output a first direct current voltage through the first power supply branch 11, and output a second direct current voltage through the second power supply branch 12. For example, the first direct current voltage output by the first power supply branch 11 can be a direct current voltage with a voltage value in the range of 3 to 30V, and the second direct current voltage output by the second power supply branch 12 can be a direct current voltage with a voltage value equal to or greater than 300V.

[0045] It is easy to understand that, in a specific implementation, the power supply unit 10 can be configured with an AC / DC conversion circuit to convert AC power into DC power, and can also be configured with a DC voltage conversion circuit to achieve voltage conversion of AC power. Of course, the power supply unit 10 can also be configured with a multi-stage voltage conversion unit to achieve voltage conversion of DC power, and then output DC power with different voltage values ​​as working power for use by each unit.

[0046] Based on the above example, on the basis of the first DC voltage output through the first power supply branch 11, a DC voltage conversion unit, such as a DC-DC voltage conversion circuit, can be configured at the output end of the power supply unit 10 to output a third DC voltage based on the first DC voltage as the power supply voltage for specific components in the circuit. For example, the specific DC voltage can be a DC voltage with a voltage value in the range of 5 to 3.3V.

[0047] It is understandable that since both AC-DC conversion and DC voltage conversion can be implemented by using existing conversion circuits or transformation circuits, they will not be described in detail here.

[0048] like Figure 2 As shown, one end of the driving unit 30 is connected to the first power supply branch 11, that is, the driving unit 30 can be provided with working power by the power supply unit 10 through the first power supply branch 11. In addition, the other end of the driving unit 30 is connected to the pulse light triggering unit 20, and can output a driving signal according to a driving control signal. Here, the driving control signal is output by the control unit 40.

[0049] In combination with the above examples, in a specific implementation, the driving unit 30 can be implemented by using an existing driving chip to build a corresponding driving circuit. The driving chip can be controlled by the driving control signal output by the control unit 40, and then output a driving signal for driving the pulse light triggering unit 20. The driving chip can specifically use the direct current provided by the above DC-DC voltage conversion circuit as working power, and the driving signal can specifically include an electrical signal of high and low levels.

[0050] In this embodiment, the control unit 40 can send a driving control signal to the driving unit 30, and then the driving unit 30 can output a driving signal to the pulse light trigger unit 20 according to the driving control signal. The pulse light trigger unit 20 outputs pulse light under the output voltage of the second power supply branch 12 and the driving signal.

[0051] exist Figure 2 In the embodiment, one end of the power-off trigger unit 50 is connected to the first power supply branch 11, and the other end of the power-off trigger unit 50 is connected to the control unit 40. The power-off trigger unit 50 can output a first trigger signal to the control unit 40 when it is detected that the output voltage of the first power supply branch 11 is less than the reference voltage value. When the control unit 40 receives the first trigger signal, it stops outputting the drive control signal to the drive unit 30. Here, since one end of the power-off trigger unit 50 is connected to the first power supply branch 11, the output voltage of the first power supply branch 11 can be sampled, and by comparing the sampled voltage value with the reference voltage value, it is determined whether the skin treatment device is in a power-off state.

[0052] In a specific implementation, the reference voltage value may be a preset voltage value that is greater than 0 and less than the output voltage value of the first power supply branch 11. It should be noted that, in actual applications, when the power supply unit 10 is disconnected from the power supply 110, since the power supply unit 10 performs AC / DC conversion and / or voltage change on the input voltage provided by the power supply 110, the voltage outputted by the power supply unit 10 through the first power supply branch 11 and the second power supply branch 12 will not drop to 0V instantly, but will gradually approach 0V. At this time, the power-off trigger unit 50 samples the output voltage of the first power supply branch 11, and the sampled voltage obtained must be less than the output voltage of the first power supply branch 11 under normal circumstances, that is, it must be less than the reference voltage value. Based on this, the power-off trigger unit 50 can determine that the power supply unit 10 is disconnected from the power supply 110 when the output voltage of the first power supply branch 11 is less than the reference voltage value by comparing the output voltage of the first power supply branch 11 with the reference voltage value. At this time, the power-off trigger unit 50 outputs a first trigger signal to the control unit 40, so that the control unit 40 can stop outputting the drive control signal to the drive unit 30 when receiving the first trigger signal, thereby preventing the drive unit 30 from outputting the drive signal to the pulse light trigger unit 20.

[0053] As an embodiment, the power-off trigger unit 50 is also used to stop outputting the first trigger signal to the control unit 40 when it is detected that the output voltage of the first power supply branch 11 is greater than or equal to the reference voltage value, or to output the second trigger signal to the control unit 40 when it is detected that the output voltage of the first power supply branch 11 is greater than or equal to the reference voltage value.

[0054] Correspondingly, the control unit 40 is further configured to output a driving control signal to the driving unit 30 when the first trigger signal is not received, or output a driving control signal to the driving unit 30 when the second trigger signal is received.

[0055] In a specific implementation, the power-off trigger unit 50 can be implemented using a sampling circuit, a comparison circuit and a constant voltage power supply. For example, the output voltage of the first power supply branch 11 can be sampled using a sampling circuit, and the voltage output by the constant voltage power supply is used as a reference voltage value, and then the sampled output voltage of the first power supply branch 11 is compared with the reference voltage value using a comparison circuit. When the output voltage of the first power supply branch 11 is less than the reference voltage value, a first trigger signal is output to the control unit 40 through the comparison circuit. The control unit 40 can stop outputting a drive control signal to the drive unit 30 when receiving the first trigger signal, thereby preventing the drive unit 30 from outputting a drive signal to the pulse light trigger unit 20.

[0056] For another example, the output voltage of the first power supply branch 11 can be sampled by a sampling circuit, and then the sampled output voltage of the first power supply branch 11 can be compared with the voltage output by the constant voltage power supply as a reference voltage value by a comparison circuit, and when the output voltage of the first power supply branch 11 is equal to or greater than the reference voltage value, the first trigger signal is stopped from being output to the control unit 40, that is, the power-off trigger unit 50 does not output any signal. The control unit 40 can output a driving control signal to the drive unit 30 when the first trigger signal is not received, so that the drive unit 30 can output a driving signal to the pulse light trigger unit 20. Alternatively, when the output voltage of the first power supply branch 11 is equal to or greater than the reference voltage value, the power-off trigger unit 50 outputs a second trigger signal to the control unit 40. The control unit 40 can output a driving control signal to the drive unit 30 when the second trigger signal is received, so that the drive unit 30 can output a driving signal to the pulse light trigger unit 20.

[0057] Figure 3 The specific structure of the power-off trigger unit in the embodiment of the present application is shown in FIG. Figure 1 .like Figure 3 As shown, based on any of the above embodiments, as an embodiment, the power-off trigger unit 50 includes: a sampling unit 51 and a comparing unit 52 .

[0058] The sampling end of the sampling unit 51 is connected to the first power supply branch 11, and the output end of the sampling unit 51 is connected to the comparison unit 52. The sampling unit 51 is used to sample the output voltage of the first power supply branch 11 to obtain a sampled voltage. The comparison unit 52 is connected between the control unit 40 and the sampling unit 51, and is used to output a first trigger signal to the control unit 40 when the sampled voltage is less than the reference voltage value.

[0059] In this embodiment, the sampling unit 51 is connected between the first power supply branch 11 and the comparison unit 52 , and can sample the output voltage of the first power supply branch 11 and transmit the sampled voltage to the comparison unit 52 .

[0060] In a specific implementation, the sampling unit 51 may include an existing voltage-dividing branch, such as a voltage-dividing branch composed of multiple resistors, connected between the first power supply branch 11 and the comparison unit 52, and divide the output voltage of the first power supply branch 11, and then use the voltage to ground of a voltage-dividing node in the voltage-dividing branch as the sampling voltage and transmit it to the comparison unit 52.

[0061] Accordingly, the input end of the comparison unit 52 is connected to the sampling unit 51, and the output end of the comparison unit 52 is connected to the control unit 40. In a specific implementation, the comparison unit 52 may have a corresponding reference voltage value built in, and when the sampling unit 51 transmits the sampled voltage to the comparison unit 52, the comparison unit 52 may compare the voltage value of the sampled voltage with the reference voltage value, and then output a first trigger signal to the control unit 40 when the voltage value of the sampled voltage is less than the reference voltage value.

[0062] It can be understood that, in some embodiments, when the sampled voltage is equal to or greater than the reference voltage value, the comparison unit 52 also stops outputting the first trigger signal to the control unit 40, or outputs the second trigger signal to the control unit 40. Accordingly, the control unit 40 may output a drive control signal to the drive unit 30 when the first trigger signal is not received, or output a drive control signal to the drive unit 30 when the second trigger signal is received.

[0063] Figure 4 The specific circuit diagram of the comparison unit in the embodiment of the present application is shown in FIG. Figure 1 . Combined Figure 3 and Figure 4 As an embodiment, the comparison unit 52 includes: a first comparator D1. Figure 4 As shown, the input terminal in of the first comparator D1 is connected to the sampling unit 51 , and the output terminal out of the first comparator D1 is connected to the control unit 40 .

[0064] In a specific implementation, an existing chip with a voltage comparison function can be selected as the first comparator D1, and since the first comparator D1 can be pre-configured with a reference voltage value, it is only necessary to connect its input terminal in with the output terminal out of the sampling unit 51 to input the sampling voltage and compare it with the reference voltage value. When the voltage value of the sampling voltage is less than the reference voltage value, the first comparator D1 outputs a first trigger signal to the control unit 40 through its output terminal out.

[0065] It can be understood that, in some embodiments, the first comparator D1 can also stop outputting the first trigger signal to the control unit 40 when the voltage value of the sampled voltage is equal to or greater than the reference voltage value. Alternatively, the first comparator D1 can also output the second trigger signal to the control unit 40 when the voltage value of the sampled voltage is equal to or greater than the reference voltage value. Accordingly, the control unit 40 can output the drive control signal to the drive unit 30 when the first trigger signal is not received, or output the drive control signal to the drive unit 30 when the second trigger signal is received.

[0066] Figure 5 The specific circuit diagram of the comparison unit in the embodiment of the present application is shown in FIG. Figure 2 As an embodiment, the comparison unit 52 includes: a second comparator D2.

[0067] A first input terminal of the second comparator D2 is connected to the sampling unit 51 , a second input terminal of the second comparator D2 is used to connect to the reference voltage node Vref to obtain a reference voltage value, and an output terminal of the second comparator D2 is connected to the control unit 40 .

[0068] In this embodiment, the second input terminal of the second comparator D2 is used to input a reference voltage node, where the reference voltage node Vref may be a reference voltage provided by a preset power supply. The voltage value of the reference voltage provided by the preset power supply may be equal to the sampled voltage value obtained by sampling the voltage of the first power supply branch 11 by the sampling unit 51 when the power supply unit 10 is normally connected to the power supply 110.

[0069] It can be understood that since the sampling unit 51 may include a voltage divider branch in actual applications, when the power supply unit 10 is normally connected to the power supply 110, the sampled voltage value sampled by the sampling unit 51 may be smaller than the voltage value actually output by the first power supply branch 11.

[0070] As an embodiment, the control unit 40 may be specifically an MCU, and the reference voltage node Vref may be specifically a voltage input terminal of the MCU. Here, the MCU refers to a processor, that is, a processing chip.

[0071] For example, in a specific implementation, a DC-DC voltage conversion circuit can be used to convert the voltage output by the first power supply branch 11, and then provide the MCU with a working voltage, that is, input the working voltage to the voltage input terminal of the MCU. Since the voltage input terminal of the MCU can be obtained after voltage conversion based on the voltage output by the first power supply branch 11, when the connection between the power supply unit 10 and the power supply 110 is disconnected, although the voltage output by the first power supply branch 11 is lower than the normal voltage, the DC-DC voltage conversion circuit can still provide the MCU with a working voltage within a certain period of time, so the time taken for the voltage input terminal of the MCU to drop to 0V will be longer than the time taken for the output voltage of the first power supply branch 11 to drop to 0V. Based on this, the voltage input terminal of the MCU can be used as a reference voltage node Vref, and then a reference voltage value is provided for comparison with the sampled voltage.

[0072] In some embodiments, the second comparator D2 may also stop outputting the first trigger signal to the control unit 40 when the voltage value of the sampled voltage is equal to or greater than the reference voltage value. Alternatively, the second comparator D2 may also output the second trigger signal to the control unit 40 when the voltage value of the sampled voltage is equal to or greater than the reference voltage value. Accordingly, the control unit 40 may output the drive control signal to the drive unit 30 when the first trigger signal is not received, or output the drive control signal to the drive unit 30 when the second trigger signal is received.

[0073] Figure 6 The specific structure of the power-off trigger unit in the embodiment of the present application is shown in FIG. Figure 2 .like Figure 6 As shown, based on any of the above embodiments, as an embodiment, the power-off trigger unit 50 includes: a sampling unit 51 and a computing unit 53 .

[0074] The sampling end of the sampling unit 51 is connected to the first power supply branch 11, and the output end of the sampling unit 51 is connected to the operation unit 53. The sampling unit 51 is used to sample the output voltage of the first power supply branch 11 to obtain the sampled voltage. The first input end of the operation unit 53 is connected to the sampling unit 51 to input the sampled voltage; the second input end of the operation unit 53 is used to connect to the reference voltage node Vref to obtain the reference voltage value; the output end of the operation unit 53 is connected to the control unit 40, and the operation unit 53 is used to output a first trigger signal to the control unit 40 when the sampled voltage is less than the reference voltage value.

[0075] In this embodiment, the operation unit 53 in the power-off trigger unit 50 is connected between the sampling unit 51 and the driving unit 30. The operation unit 53 takes the output voltage of the first power supply branch 11 and the voltage of the reference voltage node Vref as input, and the operation unit 53 outputs a first trigger signal to the control unit 40 when the sampled voltage is less than the reference voltage value.

[0076] As an embodiment, the control unit 40 may be specifically an MCU, and the reference voltage node Vref may be specifically a voltage input terminal of the MCU. Here, the MCU refers to a processor, that is, a processing chip.

[0077] Exemplarily, in a specific implementation, a DC-DC voltage conversion circuit can be used to convert the voltage output by the first power supply branch 11, and then provide the MCU with a working voltage, that is, input the working voltage to the voltage input terminal of the MCU. Since the voltage input terminal of the MCU can be obtained after voltage conversion based on the voltage output by the first power supply branch 11, when the connection between the power supply unit 10 and the power supply 110 is disconnected, although the voltage output by the first power supply branch 11 is lower than the normal voltage, for the DC-DC voltage conversion circuit, it can still provide the MCU with a working voltage within a certain time. Therefore, the time taken for the voltage input terminal of the MCU to drop to 0V will be longer than the time taken for the output voltage of the first power supply branch 11 to drop to 0V. Based on this, the voltage input terminal of the MCU can be used as a reference voltage node Vref, and then a reference voltage value is provided for comparison with the sampled voltage. It can be understood that in some embodiments, when the sampled voltage is equal to or greater than the reference voltage value, the operation unit 53 also stops outputting the first trigger signal to the control unit 40, or outputs the second trigger signal to the control unit 40. Accordingly, the control unit 40 may output a driving control signal to the driving unit 30 when the first trigger signal is not received, or output a driving control signal to the driving unit 30 when the second trigger signal is received.

[0078] Figure 7 FIG. 2 shows a specific circuit diagram of the computing unit in the embodiment of the present application. Figure 7 As shown, as an embodiment, the operation unit 53 includes a NAND gate U1.

[0079] The first input terminal in1 of the NAND gate U1 is the first input terminal of the operation unit 53 , the second input terminal in2 of the NAND gate U1 is the second input terminal of the operation unit 53 , and the output terminal out of the NAND gate U1 is the output terminal of the operation unit 53 .

[0080] In all embodiments of the present application, the power supply of the reference voltage node Vref may be provided by the power supply unit 10, and when the power supply unit 10 is disconnected from the power source 110, the voltage of the reference voltage node Vref may be maintained for a certain period of time before being powered down to 0. For example, a charge-discharge circuit may be constructed using energy storage components, and by charging the charge-discharge circuit, when the power supply unit 10 is disconnected from the power source 110, the charge-discharge circuit may be maintained for a certain period of time before being powered down to 0.

[0081] For another example, a voltage stabilizing circuit may be used to stabilize the voltage of the reference voltage node Vref when the power supply unit 10 is disconnected from the power source 110 , and the voltage is powered off to zero after a certain period of time.

[0082] In this embodiment, when the power supply unit 10 and the power supply 110 are disconnected, since the voltage of the reference voltage node Vref is 0 after a certain period of time, the NAND gate can compare the sampled voltage inputted at the first input terminal in1 with the reference voltage value of the reference voltage node Vref within the certain period of time. That is, when the voltage inputted at the first input terminal in1 of the NAND gate U1 is not equal to the normal output voltage of the first power supply branch 11, it indicates that the power supply unit 10 and the power supply 110 are disconnected, and the value of the first input terminal in1 of the NAND gate U1 is "0". On this basis, regardless of whether the voltage of the reference voltage node Vref is 0, at this time, the value of the output terminal out of the NAND gate U1 is "1", that is, the first trigger signal is outputted to the control unit 40.

[0083] When the first input terminal in1 of the NAND gate U1 inputs the normal output voltage of the first power supply branch 11, it indicates that the power supply unit 10 is not disconnected from the power source 110, and the reference voltage node Vref can certainly provide a reference voltage value, so when the second input terminal in2 of the NAND gate U1 inputs the reference voltage value provided by the reference voltage node Vref, the value of the output terminal out of the NAND gate U1 is "0", that is, the first trigger signal is stopped from being output to the control unit 40, or the second trigger signal is stopped from being output to the control unit 40.

[0084] Figure 8 FIG. 2 shows a specific circuit diagram of the sampling unit in the embodiment of the present application. Figure 8 As shown, as an embodiment, the sampling unit 51 includes: a first resistor R1 and a second resistor R2. The first end of the first resistor R1 serves as a sampling end of the sampling unit 51, the second end of the first resistor R1 is connected to the first end of the second resistor R2 to form an output node P1, the output node P1 serves as the output end of the sampling unit 51, and the second end of the second resistor R2 is grounded.

[0085] exist Figure 8 In the embodiment, the first resistor R1 and the second resistor R2 are connected in series, so as to divide the output voltage of the first power supply branch 11 and output the sampled voltage through the output node P1.

[0086] Here, combined Figures 3 to 5 In the embodiment, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the output node P1 formed is connected to the comparison unit 52, specifically connected to the input end of the first comparator D1, or connected to the first input end of the second comparator D2. Figure 6 to Figure 7 In the embodiment, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the output node P1 formed is connected to the operation unit 53, specifically connected to the first input terminal in1 of the NAND gate U1.

[0087] Fig. 9 FIG. 2 shows a schematic diagram of a control circuit of a skin treatment device provided by another embodiment of the present application. Fig. 9 As shown, the control circuit 100 of the skin treatment device further includes a voltage conversion unit 60 .

[0088] In this embodiment, one end of the voltage conversion unit 60 is connected to the first power supply branch 11, and the other end of the voltage conversion unit 60 is connected to the control unit 40 to form a reference voltage node Vref. The voltage conversion unit 60 is used to perform voltage conversion on the output voltage of the first power supply branch 11 to output converted direct current; wherein the voltage of the converted direct current is less than the output voltage of the first power supply branch 11.

[0089] In this embodiment, the voltage conversion unit 60 takes the output voltage of the first power supply branch 11 as input, and after performing DC voltage conversion, the voltage value can be outputted less than the voltage value outputted by the first power supply branch 11. In various practical applications, when the power supply unit 10 is disconnected from the power supply 110, since the DC power outputted by the first power supply branch 11 does not directly return to 0V, it can be assumed that the timing starts after the power supply unit 10 is disconnected from the power supply 110, and the time required for the DC power outputted by the first power supply branch 11 to be 0V is T1. In addition, because the voltage conversion unit 60 can still output the converted DC power in the process that the DC power outputted by the first power supply branch 11 gradually tends to 0V, it can be assumed that the timing starts after the power supply unit 10 is disconnected from the power supply 110, and the time required for the DC power outputted by the voltage conversion unit 60 through the reference voltage node Vref to be 0V is T2, where T2 is greater than T1, that is, the time when the voltage of the reference voltage node Vref is equal to 0V is later than the time when the first power supply branch 11 is equal to 0V. Based on this, a node formed by connecting the other end of the voltage conversion unit 60 and the control unit 40 can be used as a reference voltage node Vref, and the voltage of the reference voltage node Vref can be used as a reference voltage value.

[0090] In specific implementation, the voltage conversion unit 60 can be implemented by using an existing DC-DC voltage conversion circuit, which will not be described in detail here.

[0091] Fig.10 FIG. 2 shows a schematic diagram of the specific structure of the pulse light trigger unit in the embodiment of the present application. As an embodiment, in Fig.10 In the embodiment, the pulse light triggering unit 20 includes: an energy storage unit 21, a light emitting unit 22 and a switch unit 23. Specifically:

[0092] The energy storage unit 21 is connected to the second power supply branch 12 and is used to store electric energy based on the output voltage of the second power supply branch 12. The light emitting unit 22 is connected to the energy storage unit 21 at one end. The switch unit 23 is connected to the driving unit 30 and is connected between the light emitting unit 22 and the ground, and is used to open and close the path between the light emitting unit 22 and the ground according to the driving signal, so that the light emitting unit 22 is powered by the energy storage unit 21, and when the path between the light emitting unit 22 and the ground is connected, the pulse light is triggered.

[0093] In a specific implementation, the energy storage unit 21 can specifically adopt an energy storage circuit composed of energy storage elements, for example, at least one capacitor is used to store electric energy based on the output voltage of the second power supply branch 12. Of course, according to actual needs, two or more capacitors can be connected in parallel to form an energy storage unit 21, and then electric energy can be stored based on the output voltage of the second power supply branch 12.

[0094] Fig.11 FIG. 2 shows a specific circuit diagram of the pulse light trigger unit in this embodiment. As an embodiment, Fig.11 In the embodiment, the light emitting unit 22 includes a lamp tube D and a trigger L1. The lamp tube D and the trigger L1 are connected in parallel between the energy storage unit 21 and the switch unit 23, and the lamp tube D and the trigger L1 are both provided with working voltage by the energy storage unit 21. The trigger L1 is used to apply a target voltage to the lamp tube D according to the working voltage to ionize the gas in the lamp tube D. The lamp tube D is used to trigger the pulse light according to the working voltage.

[0095] like Fig.11 As shown, in this embodiment, the energy storage unit 21 may specifically include a capacitor C1, and a first end of the capacitor C1 is used to connect the second power supply branch 12, and a second end of the capacitor C1 is used to connect the lamp D and the trigger L1. The capacitor C1 can store electric energy based on the output voltage of the second power supply branch 12, and provide working voltages to the lamp D and the trigger L1 respectively through the connection node with the lamp D and the trigger L1.

[0096] like Fig.11As shown, as an embodiment, the switch unit 23 includes a switch tube Q. The controlled end of the switch tube Q is connected to the driving unit 30, the first potential end of the switch tube Q is connected to the light emitting unit 22, and the second potential end of the switch tube Q is grounded.

[0097] In a specific implementation, the switch tube Q can be an IGBT transistor. As an example, in a 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 working voltage, thereby ionizing the xenon gas in the lamp tube D. Subsequently, the driving unit 30 outputs a driving signal to the switch tube Q, thereby controlling the switch tube Q to turn on and off the path between the light-emitting unit 22 and the ground. Here, when the switch tube Q turns on the path between the light-emitting unit 22 and the ground, the lamp tube D and the trigger L1 are connected in parallel between the capacitor C1 and the ground, thereby triggering the pulse light according to the working voltage. When the switch tube Q disconnects the path between the light-emitting unit 22 and the ground, the lamp tube D and the trigger L1 are both in an open circuit state, thereby stopping the triggering of the pulse light.

[0098] Fig.12 FIG. 1 is a schematic diagram showing the structure of a skin treatment device provided in an embodiment of the present application. Fig.12 As 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.

[0099] It is understandable that in Fig.11 In the embodiment shown, due to the improvements and specific implementations related to the present application, Figures 2 to 11 The corresponding embodiments are described in detail, so they will not be described again here.

[0100] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be assigned 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. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units.

[0101] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions 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 comprises: A power supply unit, comprising a first power supply branch and a second power supply branch, wherein an output voltage of the first power supply branch is lower than an output voltage of the second power supply branch; A pulse light trigger unit connected to the second power supply branch; A driving unit, one end of which is connected to the first power supply branch and the other end of which is connected to the pulse light triggering unit, and is used to output a driving signal according to a driving control signal; a control unit connected to the driving unit, wherein the control unit is configured to stop outputting the driving control signal to the driving unit upon receiving a first trigger signal; A power-off trigger unit has one end connected to the first power supply branch and the other end connected to the control unit. The power-off trigger unit is used to output the first trigger signal to the control unit when it detects that the output voltage of the first power supply branch is less than a reference voltage value.

2. The control circuit of the skin treatment device according to claim 1, characterized in that: The power-off trigger unit is further configured to, when detecting that the output voltage of the first power supply branch is greater than or equal to a reference voltage value, stop outputting the first trigger signal to the control unit, or, when detecting that the output voltage of the first power supply branch is greater than or equal to a reference voltage value, output a second trigger signal to the control unit; The control unit is further configured to output the drive control signal to the drive unit when the first trigger signal is not received, or output the drive control signal to the drive unit when the second trigger signal is received.

3. The control circuit of the skin treatment device according to claim 1, characterized in that: The power-off trigger unit comprises: a sampling unit and a comparison unit; The sampling end of the sampling unit is connected to the first power supply branch, the output end of the sampling unit is connected to the comparison unit, and the sampling unit is used to sample the output voltage of the first power supply branch to obtain a sampled voltage; The comparison unit is connected between the control unit and the sampling unit, and is used to output the first trigger signal to the control unit when the sampling voltage is less than a reference voltage value.

4. The control circuit of the skin treatment device according to claim 3, characterized in that: The comparison unit comprises: a first comparator; The input end of the first comparator is connected to the sampling unit, and the output end of the first comparator is connected to the control unit.

5. The control circuit of the skin treatment device according to claim 3, characterized in that: The comparison unit comprises: a second comparator; The first input terminal of the second comparator is connected to the sampling unit, the second input terminal of the second comparator is used to connect to a reference voltage node to obtain the reference voltage value, and the output terminal of the second comparator is connected to the control unit.

6. The control circuit of the skin treatment device according to claim 1, characterized in that: The power-off trigger unit comprises: a sampling unit and a computing unit; The sampling end of the sampling unit is connected to the first power supply branch, the output end of the sampling unit is connected to the operation unit, and the sampling unit is used to sample the output voltage of the first power supply branch to obtain a sampled voltage; The first input terminal of the operation unit is connected to the sampling unit to input the sampling voltage; The second input terminal of the operation unit is used to connect to the reference voltage node to obtain the reference voltage value; The output end of the operation unit is connected to the control unit, and the operation unit is used to output the first trigger signal to the control unit when the sampling voltage is less than the reference voltage value.

7. The control circuit of the skin treatment device according to claim 6, characterized in that: The operation unit includes a NAND gate; The first input end of the NAND gate is the first input end of the operation unit, the second input end of the NAND gate is the second input end of the operation unit, and the output end of the NAND gate is the output end of the operation unit.

8. The control circuit of the skin treatment device according to claim 5 or 6, characterized in that: Also includes: A voltage conversion unit, one end of which is connected to the first power supply branch, and the other end of which is connected to the control unit to form the reference voltage node, wherein the voltage conversion unit is used to perform voltage conversion on the output voltage of the first power supply branch to output converted direct current; wherein the voltage of the converted direct current is less than the output voltage of the first power supply branch.

9. The control circuit of the skin treatment device according to claim 3 or 6, characterized in that: The sampling unit comprises: a first resistor and a second resistor; The first end of the first resistor serves as the sampling end of the sampling unit, the second end of the first resistor is connected to the first end of the second resistor to form an output node, the output node serves as the output end of the sampling unit, and the second end of the second resistor is grounded.

10. The control circuit of the skin treatment device according to any one of claims 1 to 7, characterized in that: The pulse light triggering unit comprises: an energy storage unit, connected to the second power supply branch, and configured to store electric energy based on the output voltage of the second power supply branch; A light emitting unit, one end of which is connected to the energy storage unit; A switch unit is connected to the driving unit and connected between the light-emitting unit and the ground, and is used to open and close the path between the light-emitting unit and the ground according to a driving signal, 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 turned on, a pulse light is triggered.

11. The control circuit of the skin treatment device according to claim 10, characterized in that: The light-emitting unit includes a lamp tube and a trigger; The lamp tube and the trigger are connected in parallel between the energy storage unit and the switch unit, and the energy storage unit provides working voltage for both the lamp tube and the trigger; The trigger is used 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 used to trigger pulse light according to the working voltage; the switch unit includes a switch tube; The controlled end of the switch tube is connected to the driving unit, the first potential end of the switch tube is connected to the light-emitting unit, and the second potential end of the switch tube is grounded.

12. The control circuit of the skin treatment device according to claim 5 or 6, characterized in that: The control unit is an MCU, and the reference voltage node is a voltage input terminal of the MCU.

13. A skin treatment device, characterized in that: The skin treatment device is a hair removal device or a skin rejuvenation device, comprising the control circuit of the skin treatment device according to any one of claims 1 to 12.

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