Lamp tube control circuit and skin treatment device

Abstract

A lamp tube control circuit is applied to a skin treatment device, the skin treatment device comprises a power supply module used for providing power supply voltage, and the lamp tube control circuit comprises a lamp tube, a voltage conversion module, a control module and a voltage adjustment module; the voltage conversion module is connected between the power supply module and the lamp tube and is used for converting power supply voltage into first working voltage and second working voltage and providing the first working voltage and the second working voltage to the lamp tube; the voltage adjusting module is connected to the voltage conversion module and is used for enabling the voltage conversion module to output a second working voltage; the control module is connected with the voltage conversion module and the voltage regulation module and is used for outputting a first control signal to the voltage conversion module so as to control the voltage conversion module to convert the power supply voltage into a first working voltage and output the first working voltage to the lamp tube, and the control module is also used for outputting a second control signal to the voltage regulation module; the lamp tube control circuit can improve the safety of the lamp tube by controlling the voltage conversion module to convert the power supply voltage into the second working voltage and outputting the second working voltage to the lamp tube.

Description

Technical Field

[0001] This application relates to the technical field of beauty and skin care, and particularly to a lamp tube control circuit and a skin treatment device. Background Art

[0002] Some skin treatment devices are equipped with lamp tubes to perform specific functions. Tungsten filament lamp tubes are a common choice. The tungsten filament material has the characteristic that its resistivity changes with temperature. At low temperatures, the resistivity of the tungsten filament material is small, and at high temperatures, the resistivity of the tungsten filament material is large. When starting the lamp tube instantaneously, the rated voltage is usually directly supplied to the lamp tube. Since the resistivity of the lamp tube is small at this time, the instantaneous current supplied to the lamp tube is large, which is likely to cause an impact on the lamp tube and affect the safety of the lamp tube. Summary of the Utility Model

[0003] In view of the above, it is necessary to provide a lamp tube control circuit and a skin treatment device, which can improve the safety of the lamp tube.

[0004] In a first aspect, an embodiment of the present application provides a lamp tube control circuit applied to a skin treatment device. The skin treatment device includes a power supply module for providing a power supply voltage. The lamp tube control circuit includes a lamp tube, a voltage conversion module, a control module, and a voltage adjustment module. The voltage conversion module is connected between the power supply module and the lamp tube. The voltage conversion module is used to convert the power supply voltage into a first working voltage and a second working voltage, and supply the first working voltage and the second working voltage to the lamp tube. Among them, the second working voltage is greater than the first working voltage. The voltage adjustment module is connected to the voltage conversion module. The voltage adjustment module is used to make the voltage conversion module output the second working voltage. The control module is connected to the voltage conversion module and the voltage adjustment module. The control module is used to output a first control signal to the voltage conversion module to control the voltage conversion module to convert the power supply voltage into the first working voltage and output the first working voltage to the lamp tube. The control module is further used to output a second control signal to the voltage adjustment module to control the voltage conversion module to convert the power supply voltage into the second working voltage and output the second working voltage to the lamp tube.

[0005] For the lamp tube control circuit of this solution, when starting the lamp tube, the control module outputs a first control signal to the voltage conversion module to control the voltage conversion module to provide a first operating voltage to the lamp tube. The first operating voltage is a smaller voltage less than the second operating voltage. Since the resistivity of the lamp tube is small at this time, the first operating voltage generates a relatively small current, reducing the impact on the lamp tube and enhancing the safety of the lamp tube. As the lamp tube obtains the first operating voltage and its temperature gradually changes, the resistivity of the lamp tube gradually increases. Then, the control module is also used to output a second control signal to the voltage adjustment module to control the voltage conversion module to provide the second operating voltage to the lamp tube, enabling the lamp tube to operate normally at the second operating voltage. During the process of starting the lamp tube, different operating voltages can be provided to the lamp tube according to the change in the resistivity of the lamp tube, reducing the impact on the lamp tube and enhancing the safety of the lamp tube.

[0006] In some embodiments, the voltage adjustment module includes a digital-to-analog conversion circuit. The digital-to-analog conversion circuit is connected between the control module and the voltage conversion module. The digital-to-analog conversion circuit is used to process the second control signal and feedback it to the voltage conversion module to control the voltage output by the voltage conversion module to gradually rise to the second operating voltage.

[0007] In some embodiments, the digital-to-analog conversion circuit is also used to process the second control signal and feedback it to the voltage conversion module to control the voltage output by the voltage conversion module to gradually rise to the first operating voltage.

[0008] In some embodiments, the voltage conversion module includes a voltage conversion unit and an energy storage unit. The voltage conversion unit includes a power input terminal, a voltage output terminal, and a feedback terminal. The power input terminal is connected to the power supply module for receiving the power supply voltage. The voltage output terminal is connected to the lamp tube through the energy storage unit. The voltage output terminal is used to output the first operating voltage or the second operating voltage to the energy storage unit and supply power to the lamp tube through the energy storage unit. The control module includes a control unit. The control unit includes a lamp tube feedback terminal. The lamp tube feedback terminal is connected to the feedback terminal for outputting the second control signal.

[0009] In some embodiments, the voltage conversion unit further includes an enable terminal, and the control unit further includes a lamp tube power control terminal. The lamp tube power control terminal is connected to the enable terminal for outputting a first control signal to turn on the voltage conversion unit. When the lamp tube power control terminal outputs the first control signal to the voltage conversion unit, the voltage conversion unit converts the power supply voltage to the first operating voltage. When the lamp tube feedback terminal outputs the second control signal to the voltage conversion unit, the voltage conversion unit converts the power supply voltage to the second operating voltage.

[0010] In some embodiments, the digital-to-analog conversion circuit includes a first resistor, a second resistor, and a first capacitor. The first resistor and the second resistor are connected in series between the lamp feedback terminal and the feedback terminal. One end of the first capacitor is connected between the first resistor and the second resistor, and the other end of the first capacitor is grounded.

[0011] In some embodiments, the lamp control circuit further includes a switch module. The switch module is electrically connected to the lamp and the control module respectively and is used to turn on or off the lamp. After outputting a first control signal, the control module delays for a preset time to control the switch module to turn on the lamp, so as to control the lamp to enter the startup state with a first operating voltage.

[0012] In some embodiments, the lamp control circuit further includes a voltage detection module. The voltage detection module is connected to the lamp and the control module and is used to detect the current voltage of the lamp. When the voltage detection module detects that the current voltage of the lamp is less than the first operating voltage, the control module controls the switch module to turn off the lamp. When the voltage detection module detects that the current voltage of the lamp is greater than or equal to the first operating voltage, the control module controls the switch module to turn on the lamp, so as to control the lamp to enter the startup state with the first operating voltage.

[0013] In some embodiments, the voltage detection module includes a third resistor, a fourth resistor, a fifth resistor, and a second capacitor. The third resistor and the fourth resistor are connected in series to the input terminal of the lamp. One end of the fifth resistor is connected between the third resistor and the fourth resistor, and the other end of the fifth resistor is connected to the control module. One end of the second capacitor is connected between the fifth resistor and the control module, and the other end of the second capacitor is grounded.

[0014] In some embodiments, the lamp control circuit further includes a current detection module. The current detection module is connected between the voltage conversion module and the lamp and is used to detect the current current of the lamp. The current detection module includes a sampling resistor and a current detection unit. The sampling resistor is connected between the voltage conversion module and the lamp and is used to collect the current current value of the lamp. The current detection unit is connected between the voltage conversion module and the lamp and is also connected to the control module. It is used to obtain the current current value collected by the sampling resistor and feedback it to the control module. The control module controls the working power of the lamp to gradually increase to a preset power according to the current voltage of the lamp detected by the voltage detection module and the current current value of the lamp obtained by the current detection module.

[0015] In some embodiments, the current detection unit includes a first detection terminal, a second detection terminal, and a detection output terminal. The first detection terminal and the second detection terminal are connected between the voltage conversion module and the lamp and are used to obtain the current current value of the lamp. The detection output terminal is connected to the control module and is used to output the current current value to the control module.

[0016] In some embodiments, the lamp tube control circuit further includes a voltage stabilization module, which is connected between the power supply module and the control module and is used to supply the power supply voltage to the control module to power the control module.

[0017] In a second aspect, an embodiment of the present application provides a skin treatment device, including a power supply module and the above-mentioned lamp tube control circuit. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the functional modules of a skin treatment device provided by an embodiment of the present application.

[0019] Figure 2 It is another schematic diagram of the functional modules of the skin treatment device provided by the embodiment of the present application.

[0020] Figure 3 It is a circuit diagram of the lamp tube control circuit provided by an embodiment of the present application.

[0021] Figure 4 It is a schematic diagram of the functional modules of the skin treatment device provided by another embodiment of the present application.

[0022] Figure 5 It is a circuit diagram of the lamp tube control circuit provided by another embodiment of the present application.

[0023] Figure 6 It is a schematic diagram of the functional modules of the skin treatment device provided by still another embodiment of the present application.

[0024] Figure 7 It is a circuit diagram of the lamp tube control circuit provided by still another embodiment of the present application.

[0025] Figure 8 It is a flowchart of the lamp tube control method of the skin treatment device provided by an embodiment of the present application.

[0026] Description of the Main Element Symbols

[0027] Skin treatment device 1 Lamp tube control circuit 100

[0028] Power supply module 200 Lamp tube 10

[0029] Voltage conversion module 20 Control module 30

[0030] Voltage adjustment module 40 Voltage stabilization module 50

[0031] Voltage detection module 60 Switch module 70

[0032] Current detection module 80 Voltage conversion unit U8

[0033] Power input terminal VIN of energy storage unit 22

[0034] Voltage output terminal SW Feedback terminal FB

[0035] Enable terminal EN Control unit U1

[0036] Lamp power control terminal LAMP-PWR-EN Lamp feedback terminal LAMP-FB-ADJ Power supply terminal VDD Voltage detection terminal LAMP-V-DET Switch control terminal LAMP-MOS-EN Current detection terminal LAMP-IA-DET Second power network VMCU_3V3 Energy storage group 23

[0037] Capacitors C48 - C51, C41 - C45 First inductor L3

[0038] First power network VIN_24V Switch unit Q10

[0039] First resistor R50 Second resistor R51

[0040] First capacitor C22 Voltage regulator unit U2

[0041] Third resistor R47 Fourth resistor R48

[0042] Fifth resistor R49 Second capacitor C53

[0043] Sampling resistor RT2 Current detection unit U9

[0044] First detection terminal IN+ Second detection terminal IN-

[0045] Detection output terminal OUT Detection terminals V-LAMP2, V-LAMP3

[0046] Digital-to-analog conversion circuit 42

[0047] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific embodiments

[0048] Hereinafter, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, words such as "exemplary", "or", "for example", etc. are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "or", "for example", etc. is intended to present relevant concepts in a specific manner.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. It should be understood that unless otherwise stated in this application, " / " means "or". For example, A / B may represent A or B. The "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone, these three situations. "At least one" means one or more. "Multiple" means two or more than two. For example, at least one of a, b, or c may represent: a, b, c, a and b, a and c, b and c, a, b, and c, these seven situations.

[0050] Please refer to Figure 1 , the embodiments of the present application provide a skin treatment device 1. In some embodiments, the skin treatment device 1 may but is not limited to be an electronic instrument for beauty and skin care such as a beauty instrument, a skin beautifying instrument, a hair removal instrument, a nursing instrument, etc.

[0051] The skin treatment device 1 may include a lamp tube control circuit 100 and a power supply module 200. The lamp tube control circuit 100 is used to control the startup of the lamp tube, and the power supply module 200 is used to store electrical energy and provide a power supply voltage to the lamp tube control circuit 100. In some embodiments, the power supply module 200 may be a rechargeable battery or a capacitor bank.

[0052] In an embodiment of a related technology, the lamp tube control circuit 100 may include a lamp tube 10, a voltage conversion module 20, and a control module 30.

[0053] The lamp tube 10 is connected to the power supply module 200 through the voltage conversion module 20 to obtain the power supply voltage from the power supply module 200 through the voltage conversion module 20. In some embodiments, the lamp tube 10 may be, but is not limited to, a tungsten filament lamp tube, including a lamp core made of tungsten filament material. It can be understood that the resistivity of the tungsten filament material usually changes with temperature. At relatively low temperatures, the resistivity of the tungsten filament material is small; at relatively high temperatures, the resistivity of the tungsten filament material is large. In some embodiments, the relationship between the tungsten filament resistance value and temperature can be expressed by the formula: R = R0(1 + αΔT), where R is the tungsten filament resistance value, R0 is the tungsten filament resistance value at room temperature, α is the temperature coefficient of the tungsten filament material, α = 0.0045, and ΔT is the temperature change. In some embodiments, when the tungsten filament lamp tube is turned on or off, the tungsten filament will experience rapid temperature changes of cooling and heating. Also, due to the anisotropy of the internal crystals of the tungsten filament showing thermal stress, when the thermal stress exceeds the elastic limit of the material at high temperatures, local plastic deformation will occur. After a certain number of cycles, thermal fatigue cracks may be caused. The fatigue cracks combine to form main cracks, and these areas become stress-sensitive areas. If stress concentration suddenly appears, the cracks can extend in depth, leading to the breakage of the tungsten filament at the point of extinction.

[0054] The voltage conversion module 20 is connected between the power supply module 200 and the lamp tube 10. The voltage conversion module 20 is used to convert the power supply voltage provided by the power supply module 200 to a preset working voltage and provide the preset working voltage to the lamp tube 10. In some embodiments, the preset working voltage may be the working voltage of the lamp tube 10.

[0055] The control module 30 is connected to the voltage conversion module 20. The control module 30 is used to control the voltage conversion module 20 to turn on to convert the power supply voltage provided by the power supply module 200 to a preset working voltage.

[0056] When the lamp tube control circuit 100 is started to operate the lamp tube 10, the control module 30 controls the voltage conversion module 20 to turn on. The voltage conversion module 20 converts the power supply voltage provided by the power supply module 200 to a preset working voltage and provides the preset working voltage to the lamp tube 10, so that the lamp tube 10 obtains the preset working voltage and starts and enters the working state. However, if the lamp tube 10 is in a non-working state for a certain period of time, the temperature of the lamp tube 10 is relatively low. At relatively low temperatures, the resistivity of the tungsten filament material is small. At the moment when the lamp tube 10 obtains the preset working voltage, due to the small resistivity of the tungsten filament material of the lamp tube 10, the instantaneous current provided to the lamp tube 10 is large, which is likely to cause an impact on the lamp tube 10 and affect the safety of the lamp tube 10.

[0057] Please refer to Figure 2 , the lamp tube control circuit 100 provided by the embodiment of the present application may include a lamp tube 10, a voltage conversion module 20, a control module 30, and a voltage adjustment module 40.

[0058] The lamp tube 10 is connected to the power supply module 200 through the voltage conversion module 20 to obtain the power supply voltage from the power supply module 200 through the voltage conversion module 20. In some embodiments, the lamp tube 10 may be, but is not limited to, a tungsten filament lamp tube, including a lamp core made of tungsten filament material. It can be understood that the resistivity of the tungsten filament material usually changes with temperature. At relatively low temperatures, the resistivity of the tungsten filament material is small; at relatively high temperatures, the resistivity of the tungsten filament material is large.

[0059] The voltage conversion module 20 is connected between the power supply module 200 and the lamp tube 10. The voltage conversion module 20 is used to convert the power supply voltage provided by the power supply module 200 into a first operating voltage and a second operating voltage, and provide the first operating voltage and the second operating voltage to the lamp tube 10. In some embodiments, the second operating voltage is greater than the first operating voltage. Among them, the first operating voltage may be the starting voltage of the lamp tube 10, and the second operating voltage may be the operating voltage of the lamp tube 10.

[0060] The voltage adjustment module 40 is connected to the voltage conversion module 20. The voltage adjustment module 40 is used to make the voltage conversion module 20 output the second operating voltage.

[0061] The control module 30 is connected to the voltage conversion module 20 and the voltage adjustment module 40. The control module 30 is used to output a first control signal to the voltage conversion module 20 to control the voltage conversion module 20 to turn on to convert the power supply voltage provided by the power supply module 200 into the first operating voltage, and output the first operating voltage to the lamp tube 10. The control module 30 is also used to output a second control signal to the voltage adjustment module 40 to control the voltage conversion module 20 to convert the power supply voltage into the second operating voltage, and output the second operating voltage to the lamp tube 10.

[0062] When the lamp tube control circuit 100 starts to operate the lamp tube 10, the control module 30 outputs a first control signal to the voltage conversion module 20 to control the voltage conversion module 20 to convert the power supply voltage provided by the power supply module 200 into a first operating voltage and supply the first operating voltage to the lamp tube 10, so that the lamp tube 10 obtains the first operating voltage and starts. In some embodiments, when the lamp tube 10 does not operate for more than a preset time, such as 2 hours, the internal resistance RL (resistance value of tungsten wire material) of the lamp tube 10 is small, such as less than or equal to 0.6 ohms (Ω), and the lamp tube 10 obtains the first operating voltage and starts. In some embodiments, the first operating voltage can be, but is not limited to, 3 volts (V). At this time, the starting current of the lamp tube 10 can be 5.0 amperes (A), and the starting current will not cause too much impact on the lamp tube 10, ensuring the safety of the lamp tube 10. As the lamp tube 10 obtains the first operating voltage and starts, the temperature of the lamp tube 10 rises, and the internal resistance RL (resistance value of tungsten wire material) of the lamp tube 10 increases accordingly, such as approximately 4 ohms. The control module 30 outputs a second control signal to the voltage adjustment module 40 to control the voltage conversion module 20 to convert the power supply voltage provided by the power supply module 200 into a second operating voltage and supply the second operating voltage to the lamp tube 10, so that the lamp tube 10 obtains the second operating voltage and enters the operating state. In some embodiments, the second operating voltage can be, but is not limited to, 12V. At this time, the starting current of the lamp tube 10 can be 3.0A, and the operating current can make the lamp tube 10 work normally. Moreover, the current fluctuation between the operating current and the starting current is small and will not cause too much impact on the lamp tube 10, ensuring the safety of the lamp tube 10.

[0063] Please refer to Figure 2 and Figure 3 , the voltage adjustment module 40 of the embodiment of the present application may include a digital-to-analog conversion circuit 42.

[0064] The digital-to-analog conversion circuit 42 is connected between the control module 30 and the voltage conversion module 20. The digital-to-analog conversion circuit 42 is used to process the second control signal and feedback it to the voltage conversion module 20 to control the voltage output by the voltage conversion module 20 to gradually rise to the second operating voltage. In some embodiments, the digital-to-analog conversion circuit 42 processes the second control signal output by the control module 30, such as performing digital-to-analog conversion, and feeds the converted second control signal back to the voltage conversion module 20 to control the voltage output by the voltage conversion module 20 to gradually rise to the second operating voltage, such as controlling the voltage output by the voltage conversion module 20 to gradually or smoothly rise to 12V, thereby reducing the impact of the voltage output by the voltage conversion module 20 on the lamp tube control circuit 100 and slowing down the oscillation of the circuit system.

[0065] In some embodiments, the digital-to-analog conversion circuit 42 is further configured to process the second control signal output by the control module 30, for example, perform digital-to-analog conversion, and feedback the converted second control signal to the voltage conversion module 20 to control the voltage output by the voltage conversion module 20 to gradually rise to the first operating voltage. For example, control the voltage output by the voltage conversion module 20 to gradually or smoothly rise to 3V, so as to reduce the impact of the voltage output by the voltage conversion module 20 on the lamp control circuit 100 and slow down the oscillation of the circuit system. In some embodiments, the gradual or smooth rise may but is not limited to being a linear rise. It can be understood that in other embodiments, the voltage adjustment module 40 may also be a voltage adjustment circuit composed of a potentiometer or a transistor.

[0066] Please refer to Figure 3 , in the circuit diagram of the lamp control circuit provided by the embodiment of the present application, the voltage conversion module 20 includes a voltage conversion unit U8 and an energy storage unit 22.

[0067] The voltage conversion unit U8 is connected between the power supply module 200 and the energy storage unit 22. The voltage conversion unit U8 is configured to convert the power supply voltage provided by the power supply module 200 into a first operating voltage and a second operating voltage, and provide the first operating voltage and the second operating voltage to the energy storage unit 22. The voltage conversion unit U8 is also connected to the control module 30. The control module 30 can be configured to control the voltage conversion unit U8 to convert the power supply voltage provided by the power supply module 200 into the first operating voltage. The voltage conversion unit U8 is also connected to the control module 30 through the digital-to-analog conversion circuit 42. The control module 30 can be configured to output a second control signal through the digital-to-analog conversion circuit 42 and provide it to the voltage conversion unit U8 to control the voltage conversion unit U8 to convert the power supply voltage provided by the power supply module 200 into the second operating voltage. The energy storage unit 22 is connected between the voltage conversion unit U8 and the lamp 10, and is configured to store the first operating voltage and the second operating voltage output by the voltage conversion unit U8 and provide them to the lamp 10.

[0068] In some embodiments, the voltage conversion unit U8 may but is not limited to being a voltage conversion chip. The voltage conversion unit U8 may include a power supply input terminal VIN, a voltage output terminal SW, a feedback terminal FB, and an enable terminal EN.

[0069] The power supply input terminal VIN can be connected to the power supply module 200 for receiving the power supply voltage from the power supply module 200. The voltage output terminal SW is connected to the lamp 10 through the energy storage unit 22. The voltage output terminal SW is configured to output the first operating voltage and the second operating voltage to the energy storage unit 22 and provide the first operating voltage and the second operating voltage to the lamp 10 through the energy storage unit 22.

[0070] The control module 30 may include a control unit U1. The control unit U1 may be, but is not limited to, a control chip, a controller, or a processor, such as a microcontroller unit (MCU) or a microprocessor. The control unit U1 may include a lamp power control terminal LAMP-PWR-EN and a lamp feedback terminal LAMP-FB-ADJ.

[0071] The lamp power control terminal LAMP-PWR-EN is connected to the enable terminal EN. The control unit U1 may output a first control signal to the voltage conversion unit U8 through the lamp power control terminal LAMP-PWR-EN. The voltage conversion unit U8 receives the first control signal through the enable terminal EN to turn on, and the voltage conversion unit U8 converts the power supply voltage provided by the power supply module 200 into a first operating voltage. In some embodiments, the first control signal may be, but is not limited to, an enable signal. The lamp feedback terminal LAMP-FB-ADJ is connected to the feedback terminal FB through the digital-to-analog conversion circuit 42. The control unit U1 may output a second control signal to the voltage conversion unit U8 through the lamp feedback terminal LAMP-FB-ADJ. The digital-to-analog conversion circuit 42 performs digital-to-analog conversion on the second control signal and feeds the converted second control signal back to the voltage conversion unit U8. The voltage conversion unit U8 receives the second control signal through the feedback terminal FB and converts the power supply voltage provided by the power supply module 200 into a second operating voltage.

[0072] In some embodiments, the energy storage unit 22 may include a plurality of capacitors C48 - C51 connected in parallel. The voltage output terminal SW may be connected to the energy storage unit 22 through the first inductor L3. The first operating voltage or the second operating voltage output by the voltage conversion unit U8 through the voltage output terminal SW may be charged to the energy storage unit 22 by the current passing through the first inductor L3.

[0073] The power input terminal VIN is used to connect to the power supply module 200. In some embodiments, the power input terminal VIN is connected to the first power network VIN_24V through the energy storage group 23. The first power network VIN_24V may be the power supply voltage output port of the power supply module 200. The energy storage group 23 may include a plurality of capacitors C41 - C45 connected in parallel. The voltage conversion unit U8 obtains the power supply voltage from the power supply module 200 through the power input terminal VIN.

[0074] The digital-to-analog conversion circuit 42 may include a first resistor R50, a second resistor R51, and a first capacitor C22. The first resistor R50 and the second resistor R51 are connected in series between the lamp feedback terminal LAMP-FB-ADJ and the feedback terminal FB. One end of the first capacitor C22 is connected between the first resistor R50 and the second resistor R51, and the other end of the first capacitor C22 is grounded.

[0075] In some embodiments, the control unit U1 can output a first control signal to the voltage conversion unit U8 through the lamp power supply control terminal LAMP-PWR-EN. The voltage conversion unit U8 receives the first control signal through the enable terminal EN to turn on, and the voltage conversion unit U8 converts the power supply voltage provided by the power supply module 200 into a first operating voltage. The control unit U1 also outputs a second control signal to the digital-to-analog conversion circuit 42 through the lamp feedback terminal LAMP-FB-ADJ. The digital-to-analog conversion circuit 42 receives and processes the second control signal, and feeds it back to the voltage conversion unit U8 through the feedback terminal FB, so as to control the voltage output by the voltage conversion unit U8 through the voltage output terminal SW to gradually or smoothly rise to the first operating voltage and provide it to the energy storage unit 22.

[0076] In some embodiments, as the lamp tube 10 is started with the first operating voltage, the temperature of the lamp tube 10 rises, and the internal resistance RL (the resistance value of the tungsten wire material) of the lamp tube 10 increases accordingly. The control unit U1 also outputs a second control signal to the digital-to-analog conversion circuit 42 through the lamp feedback terminal LAMP-FB-ADJ. The digital-to-analog conversion circuit 42 receives and processes the second control signal, and feeds it back to the voltage conversion unit U8 through the feedback terminal FB, so as to control the voltage output by the voltage conversion unit U8 through the voltage output terminal SW to gradually or smoothly rise to the second operating voltage and provide it to the energy storage unit 22.

[0077] Please refer to Figure 2 , the lamp control circuit 100 of the embodiment of the present application may further include a voltage stabilizing module 50. The voltage stabilizing module 50 is connected between the power supply module 200 and the control module 30, and is used to provide the power supply voltage output by the power supply module 200 to the control module 30 to supply power to the control module 30.

[0078] The control unit U1 may further include a power supply terminal VDD for obtaining an operating voltage. The voltage stabilizing module 50 may include a voltage stabilizing unit U2, and the voltage stabilizing unit U2 may be used to stabilize the power supply voltage output by the power supply module 200 and then output it to the control module 30. The first end of the voltage stabilizing unit U2 is connected to the first power supply network VIN_24V to receive the power supply voltage of the power supply module 200. The second end of the voltage stabilizing unit U2 is grounded. The third end of the voltage stabilizing unit U2 is connected to the power supply terminal VDD. In some embodiments, the third end of the voltage stabilizing unit U2 may be connected to the power supply terminal VDD through the second power supply network VM CU_3V3.

[0079] Please refer to Figure 4, in some other embodiments of the present application, the lamp control circuit 100 may include a switch module 70. The switch module 70 is connected to the lamp 10 and the control module 30 and is used to turn on or off the lamp 10. After a preset time delay after the control module 30 outputs the first control signal, the control module 30 controls the switch module 70 to turn on the lamp 10 so as to control the lamp 10 to enter the startup state with the first operating voltage. In some embodiments, during the period when the control module 30 outputs the first control signal to the voltage conversion module 20 and controls the voltage output by the voltage conversion module 20 to gradually rise to the first operating voltage, the lamp 10 may not stably obtain the first operating voltage, which may easily cause the entire lamp control circuit 100 to work unstably. At this time, the control module 30 can control the switch module 70 to turn off the lamp 10. Therefore, after a preset time delay after the control module 30 outputs the first control signal, the control module 30 controls the switch module 70 to turn on the lamp 10 again to preheat the lamp 10 and control the lamp 10 to enter the startup state with the first operating voltage. Thus, it is possible to avoid the oscillating operating state of the power conversion module 20 caused by the lamp 10 during cold startup, and further ensure the stable operation of the lamp control circuit 100.

[0080] Please refer to Figure 4 , the lamp control circuit 100 provided by another embodiment of the present application may further include a voltage detection module 60.

[0081] The voltage detection module 60 is connected to the lamp 10 and the control module 30 and is used to detect the current voltage of the lamp 10. The switch module 70 is connected to the lamp 10 and the control module 30 and is used to turn on or off the lamp 10. After the control module 30 outputs the first control signal and when the voltage detection module 60 detects that the current voltage of the lamp 10 is less than the first operating voltage, the control module 30 controls the switch module 70 to turn off the lamp 10; when the voltage detection module 60 detects that the current voltage of the lamp 10 is greater than or equal to the first operating voltage, the control module 30 controls the switch module 70 to turn on the lamp 10 so that the lamp 10 enters the startup state with the first operating voltage. Thus, when the voltage detection module 60 detects that the current voltage of the lamp 10 is greater than or equal to the first operating voltage, it feeds back to the control module 30 in a timely manner, enabling the control module 30 to more accurately control the conduction of the lamp 10 and realizing the gradual increase of the voltage provided to the lamp 10. Please refer to Figure 5 , the control unit U1 may further include a voltage detection terminal LAMP-V-DET and a switch control terminal LAMP-MOS-EN. The voltage detection module 60 may include a third resistor R47, a fourth resistor R48, a fifth resistor R49 and a second capacitor C53. Through the voltage detection module 60, the output voltage of the voltage conversion unit U8 can be monitored more accurately to control the lamp 10 more timely. In the embodiments provided with the analog-to-digital conversion circuit, the output voltage of the voltage conversion unit U8 can be controlled to increase gradually and smoothly more accurately, ensuring the stability of the system.

[0082] The third resistor R47 and the fourth resistor R48 are connected in series. One end of the third resistor R47 is connected to the input end of the lamp tube 10, and one end of the fourth resistor R48 is grounded. One end of the fifth resistor R49 is connected between the third resistor R47 and the fourth resistor R48, and the other end of the fifth resistor R49 is connected to the voltage detection terminal LAMP-V-DET of the control unit U1. One end of the second capacitor C53 is connected between the fifth resistor R49 and the voltage detection terminal LAMP-V-DET, and the other end of the second capacitor C53 is grounded. The voltage detection module 60 can obtain the supply voltage obtained by the lamp tube 10 currently by detecting the current voltage at the input end of the lamp tube 10, and feedback it to the control unit U1 through the voltage detection terminal LAMP-V-DET.

[0083] The switch module 70 may include a switch unit Q10. One end of the switch unit Q10 is connected to the lamp tube 10, and the other end of the switch unit Q10 is connected to the switch control terminal LAMP-MOS-EN of the control unit U1.

[0084] During the process that the voltage conversion unit U8 outputs from zero to the first operating voltage, the voltage output through the voltage output terminal SW charges the energy storage unit 22 through the first inductor L3, and then the energy storage unit 22 discharges to the lamp tube 10. During this process, the lamp tube 10 continuously consumes the energy of the energy storage unit 22 during the cold start time, and the lamp tube 10 does not stably obtain the first operating voltage, which easily causes the entire lamp tube control circuit 100 to work unstably. To solve this problem, when the voltage detection module 60 detects that the current voltage output from the energy storage unit 22 to the lamp tube 10 stably reaches the first operating voltage, the control unit U1 outputs a switch signal to the switch unit Q10 through the switch control terminal LAMP-MOS-EN to turn on the lamp tube 10 so that the lamp tube is in the working state. Thus, the lamp tube 10 can obtain a stable first operating voltage (i.e., the start-up voltage of the lamp tube 10), enabling the lamp tube 10 to start stably and ensuring the stable operation of the lamp tube control circuit 100.

[0085] Please refer to Figure 6 The lamp tube control circuit 100 provided by another embodiment of the present application may further include a current detection module 80. The current detection module 80 is connected between the voltage conversion module 20 and the lamp tube 10 and is used to detect the current of the lamp tube 10.

[0086] Please refer to together Figure 7, the control unit U1 may further include a current detection terminal LAMP-IA-DET. The current detection module 80 may include a sampling resistor RT2 and a current detection unit U9. The sampling resistor RT2 is connected between the energy storage unit 22 and the lamp tube 10 for collecting the current value of the lamp tube 10. The current detection unit U9 is connected between the energy storage unit 22 and the lamp tube 10, and is connected to both ends of the sampling resistor RT2. The current detection unit U9 is also connected to the control unit U1. The current detection unit U9 can be used to obtain the current value collected by the sampling resistor RT2 and feedback it to the control unit U1. Through the current detection module 80, the current flowing through the lamp tube 10 can be monitored to more accurately ensure that the working power of the lamp tube 10 gradually increases to the rated power, ensuring the stability of the system.

[0087] The current detection unit U9 may include a first detection terminal IN+, a second detection terminal IN−, and a detection output terminal OUT. The first detection terminal IN+ and the second detection terminal IN− are respectively connected between the energy storage unit 22 and the lamp tube 10 through the detection terminals V-LAMP2 and V-LAMP3, and are connected to both ends of the sampling resistor RT2 for obtaining the current value of the lamp tube 10. The detection output terminal OUT is connected to the current detection terminal LAMP-IA-DET of the control unit U1 for feeding back the detected current value of the lamp tube 10 to the control unit U1.

[0088] When the voltage detection module 60 detects that the current voltage output from the energy storage unit 22 to the lamp tube 10 stably reaches the second working voltage, the control unit U1 outputs a second switch signal to the switch unit Q10 through the switch control terminal LAMP-MOS-EN to turn on the lamp tube 10 so that the lamp tube is in the working state. At this time, the voltage detection module 60 continues to detect the current voltage value output from the energy storage unit 22 to the lamp tube 10, and the current detection unit U9 detects the current value collected by the sampling resistor RT2, that is, the current value flowing through the lamp tube 10. According to the power calculation formula P = UI, the power value of the lamp tube 10 is obtained. The control unit U1 performs a linear design according to the power value and the time curve to linearly increase the working power of the lamp tube 10 to a preset power, thereby reducing the impact on the lamp tube 10 and ensuring the stability of the lamp tube control circuit 100. In some embodiments, the preset power may be the rated working power set according to the characteristics of the tungsten wire material in the lamp tube 10.

[0089] Please refer to Figure 8 , for the lamp tube control method of the skin treatment device provided by an embodiment of the present application. Exemplarily, Figure 8 The lamp tube control method shown can be executed by Figure 6 and Figure 7 the skin treatment device 1 and the lamp tube control circuit 100 shown, and includes the following steps.

[0090] Step S811: The control module outputs a first control signal to the voltage conversion module to control the voltage conversion module to turn on. The voltage conversion module converts the power supply voltage provided by the power supply module to a first operating voltage and supplies the first operating voltage to the lamp tube.

[0091] In some embodiments, after the skin treatment device 1 is powered on and when the lamp tube control circuit 100 starts to operate the lamp tube 10, the control module 30 outputs a first control signal to the voltage conversion module 20 to control the voltage conversion module 20 to turn on. The voltage conversion module 20 converts the power supply voltage provided by the power supply module 200 to a first operating voltage and supplies the first operating voltage to the lamp tube 10, so that the lamp tube 10 obtains the first operating voltage and starts.

[0092] In some embodiments, when the lamp tube 10 does not work for more than a preset time, such as 2 hours, the internal resistance RL (the resistance value of the tungsten wire material) of the lamp tube 10 is small, such as less than or equal to 0.6 ohm, and the lamp tube 10 obtains the first operating voltage and starts. In some embodiments, the first operating voltage can be but is not limited to 3 volts (V). At this time, the starting current of the lamp tube 10 can be 5.0 amperes (A), and the starting current will not cause too much impact on the lamp tube 10, ensuring the safety of the lamp tube 10.

[0093] In some embodiments, in step S811, it may further include that the voltage stabilizing module 50 supplies the power supply voltage output by the power supply module 200 to the control module 30 to supply power to the control module 30.

[0094] Step S812: The control module outputs a second control signal to the voltage adjustment module to control the voltage conversion module to convert the power supply voltage provided by the power supply module to a second operating voltage and supply the second operating voltage to the lamp tube.

[0095] In some embodiments, as the lamp tube 10 obtains the first operating voltage and starts, the temperature of the lamp tube 10 rises, and the internal resistance RL (the resistance value of the tungsten wire material) of the lamp tube 10 increases accordingly, such as approximately 4 ohms. The control module 30 outputs a second control signal to the voltage adjustment module 40 to control the voltage conversion module 20 to convert the power supply voltage provided by the power supply module 200 to a second operating voltage and supply the second operating voltage to the lamp tube 10, so that the lamp tube 10 obtains the second operating voltage. In some embodiments, the second operating voltage can be but is not limited to 12V. At this time, the starting current of the lamp tube 10 can be 3.0A, and the operating current can make the lamp tube 10 work normally, and the current fluctuation between the operating current and the starting current is small and will not cause too much impact on the lamp tube 10, ensuring the safety of the lamp tube 10.

[0096] Step S813: The voltage detection module detects whether the current voltage output from the energy storage unit to the lamp tube reaches the first operating voltage, or the control module determines whether the delay preset time is reached after outputting the first control signal.

[0097] In some embodiments, after the control module 30 outputs the first control signal, the control module 30 determines whether the delay preset time is reached. Alternatively, the voltage detection module 60 can continuously detect the current voltage output from the energy storage unit 22 to the lamp tube 10 and determine whether the current voltage reaches the first operating voltage. When it is determined that the current voltage does not reach the first operating voltage or the control module 30 determines that the delay preset time is not reached after outputting the first control signal, step S813 is repeatedly executed; when it is determined that the current voltage reaches the first operating voltage or the control module 30 determines that the delay preset time is reached after outputting the first control signal, step S815 is executed.

[0098] In some embodiments, during the process that the voltage conversion unit U8 of the voltage conversion module 20 outputs the first operating voltage from zero output to turn-on, the voltage output through the voltage output terminal SW charges the energy storage unit 22 through the first inductor L3, and then the energy storage unit 22 discharges to the lamp tube 10. During this process, the lamp tube 10 continuously consumes the energy of the energy storage unit 22 during the cold start time, and the lamp tube 10 does not stably obtain the first operating voltage, which easily causes the entire lamp tube control circuit 100 to work unstably. To solve this problem, the lamp tube 10 will not be turned on, so as to ensure the stable operation of the lamp tube control circuit 100.

[0099] Step S814: The control module outputs a second switch signal to the switch module to make the lamp tube in an operating state.

[0100] In some embodiments, when the voltage detection module 60 detects that the current voltage output from the energy storage unit 22 to the lamp tube 10 stably reaches the first operating voltage, the control unit U1 of the control module 30 outputs a second switch signal to the switch unit Q10 of the switch module 70 through the switch control terminal LAMP-MOS-EN to turn on the lamp tube 10 to make the lamp tube in an operating state. Thus, the lamp tube 10 can obtain a stable first operating voltage (i.e., the starting voltage of the lamp tube 10), and the lamp tube 10 starts to work, which can ensure the stable operation of the lamp tube control circuit 100.

[0101] Step S815: The current detection module detects the current value of the lamp tube, and the control module controls the operating power of the lamp tube to gradually increase to the preset power according to the detected current voltage value and current value of the lamp tube.

[0102] In some embodiments, when the voltage detection module 60 detects that the current voltage output from the energy storage unit 22 to the lamp tube 10 has stably reached the second operating voltage, the control unit U1 outputs a second switching signal to the switching unit Q10 through the switch control terminal LAMP-MOS-EN to turn on the lamp tube 10 so that when the lamp tube is in the operating state, the voltage detection module 60 continues to detect the current voltage value output from the energy storage unit 22 to the lamp tube 10, and the current detection unit U9 detects the current value collected by the sampling resistor RT2, that is, the current value flowing through the lamp tube 10, and the power value of the lamp tube 10 is obtained according to the power calculation formula P = UI. The control unit U1 performs linear design according to the power value and the time curve to control the operating power of the lamp tube 10 to linearly increase to a preset power, thereby reducing the impact on the lamp tube 10 and ensuring the stability of the lamp tube control circuit 100. In some embodiments, the preset power may be the rated operating power set according to the characteristics of the tungsten wire material in the lamp tube 10.

[0103] From the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0104] In several embodiments provided in the present application, it should be understood that the disclosed system can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0105] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present application, the present application can be implemented in other specific forms. Therefore, as long as it is within the scope of the essential spirit of the present application, the appropriate changes and variations made to the above embodiments should fall within the scope of the present application claimed.

Claims

1. A lamp control circuit, applied to a skin treatment device, wherein the skin treatment device comprises a power module for providing a power supply voltage, characterized in that: The lamp control circuit includes a lamp, a voltage conversion module, a control module and a voltage adjustment module; The voltage conversion module is connected between the power module and the lamp tube, and is used to convert the power voltage into a first working voltage and a second working voltage, and provide the first working voltage and the second working voltage to the lamp tube; wherein the second working voltage is greater than the first working voltage; The voltage adjustment module is connected to the voltage conversion module, and the voltage adjustment module is used to make the voltage conversion module output the second working voltage; The control module is connected to the voltage conversion module and the voltage adjustment module. The control module is used to output a first control signal to the voltage conversion module to control the voltage conversion module to convert the power supply voltage to the first working voltage and output the first working voltage to the lamp tube. The control module is also used to output a second control signal to the voltage adjustment module to control the voltage conversion module to convert the power supply voltage to the second working voltage and output the second working voltage to the lamp tube.

2. The lamp control circuit according to claim 1, characterized in that: The voltage adjustment module includes a digital-to-analog conversion circuit, which is connected between the control module and the voltage conversion module. The digital-to-analog conversion circuit is used to process the second control signal and feed it back to the voltage conversion module to control the voltage output by the voltage conversion module to gradually rise to the second operating voltage.

3. The lamp control circuit according to claim 2, characterized in that: The digital-to-analog conversion circuit is further used to process the second control signal and feed it back to the voltage conversion module to control the voltage output by the voltage conversion module to gradually increase to the first operating voltage.

4. The lamp control circuit according to any one of claims 1 to 3, characterized in that: The voltage conversion module includes a voltage conversion unit and an energy storage unit. The voltage conversion unit comprises a power input terminal, a voltage output terminal and a feedback terminal, wherein the power input terminal is connected to the power module and is used to receive the power supply voltage, the voltage output terminal is connected to the lamp tube through the energy storage unit, and the voltage output terminal is used to output the first working voltage and the second working voltage to the energy storage unit, and supply power to the lamp tube through the energy storage unit; The control module includes a control unit, and the control unit includes a lamp feedback end, and the lamp feedback end is connected to the feedback end and is used to output the second control signal.

5. The lamp control circuit according to claim 4, characterized in that: The voltage conversion unit further includes an enable terminal, and the control unit further includes a lamp power control terminal, wherein the lamp power control terminal is connected to the enable terminal and is used to output the first control signal to turn on the voltage conversion unit. When the first control signal is output to the voltage conversion unit at the lamp tube power control end, the voltage conversion unit converts the power supply voltage to the first working voltage; when the second control signal is output to the voltage conversion unit at the lamp tube feedback end, the voltage conversion unit converts the power supply voltage to the second working voltage.

6. The lamp control circuit according to claim 2 or 3, characterized in that: The digital-to-analog conversion circuit includes a first resistor, a second resistor and a first capacitor. The first resistor and the second resistor are connected in series between the feedback end of the lamp tube and the feedback end. One end of the first capacitor is connected between the first resistor and the second resistor, and the other end of the first capacitor is grounded.

7. The lamp control circuit according to claim 2 or 3, characterized in that: The lamp control circuit further comprises a switch module, which is electrically connected to the lamp and the control module respectively and is used to turn on or off the lamp; The control module delays a preset time after outputting the first control signal, and controls the switch module to turn on the lamp, so as to control the lamp to enter a start-up state with the first working voltage.

8. The lamp control circuit according to claim 7, characterized in that: The lamp control circuit further includes a voltage detection module, which is connected to the lamp and the control module and is used to detect the current voltage of the lamp; When the voltage detection module detects that the current voltage of the lamp is less than the first working voltage, the control module controls the switch module to turn off the lamp; When the voltage detection module detects that the current voltage of the lamp is greater than or equal to the first working voltage, the control module controls the switch module to turn on the lamp, so as to control the lamp to enter a start-up state with the first working voltage.

9. The lamp control circuit according to claim 8, characterized in that: The voltage detection module includes a third resistor, a fourth resistor, a fifth resistor and a second capacitor. The third resistor and the fourth resistor are connected in series at the input end of the lamp tube, one end of the fifth resistor is connected between the third resistor and the fourth resistor, the other end of the fifth resistor is connected to the control module, one end of the second capacitor is connected between the fifth resistor and the control module, and the other end of the second capacitor is grounded.

10. The lamp control circuit according to claim 8, characterized in that: The lamp control circuit further includes a current detection module, which is connected between the voltage conversion module and the lamp and is used to detect the current current of the lamp; The current detection module includes a sampling resistor and a current detection unit. The sampling resistor is connected between the voltage conversion module and the lamp tube, and is used to collect the current current value of the lamp tube; The current detection unit is connected between the voltage conversion module and the lamp tube, and is connected to the control module, and is used to obtain the current current value collected by the sampling resistor and feed it back to the control module; The control module controls the working power of the lamp to gradually increase to a preset power according to the current voltage of the lamp detected by the voltage detection module and the current current value of the lamp acquired by the current detection module.

11. The lamp control circuit according to claim 10, characterized in that: The current detection unit includes a first detection end, a second detection end and a detection output end. The first detection end and the second detection end are connected between the voltage conversion module and the lamp tube to obtain the current current value of the lamp tube; the detection output end is connected to the control module to output the current current value to the control module.

12. The lamp control circuit according to claim 1, characterized in that: The lamp control circuit further includes a voltage stabilizing module, which is connected between the power module and the control module and is used to provide a power supply voltage to the control module to power the control module.

13. A skin treatment device, characterized in that: The skin treatment device comprises a power module and a lamp control circuit as claimed in any one of claims 1 to 12.

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