A control circuit for an epilator

Abstract

The application discloses a control circuit of an epilator, which comprises a voltage boosting module, a function control module, an energy storage module, an energy output control module and a processing module. When the epilator is powered on, the voltage boosting module boosts the voltage of a power supply to charge the energy storage module. When the function control module receives an epilation instruction, the processing module discharges the energy storage module, and the energy output control module makes the output energy density less than a set energy density, thereby prolonging the energy output time length, reducing the burning or pain feeling during epilation, preventing the user's skin from being burned, improving the user experience, and ensuring that the total energy of the output light of the epilator is unchanged and the epilation effect reaches the expected effect. When the voltage of the energy storage module is lower than a preset value, the voltage boosting module boosts the input voltage to charge the energy storage module, so that the epilation work can output light for a sufficient time length.

Description

Technical Field

[0001] The present invention relates to a hair removal device technology, in particular to a control circuit of a hair removal device. Background Art

[0002] As people's living standards continue to improve, they are paying more and more attention to their own image and temperament, and the demand for hair removal, beauty and body care is also increasing. The existing hair removal device is an IPL (Intense Pulsed Light) hair removal device, which uses intense pulsed light to penetrate the epidermis and be absorbed by the hair follicles in the dermis, generating heat energy, destroying the melanin in the hair follicles, inhibiting hair growth, and thus achieving hair removal. When the hair removal device is working, the energy release time of ordinary hair removal devices is very short. The total energy output by the energy storage module of the hair removal device will be fully released within this time. This makes the energy density released per unit time of the hair removal device high (that is, the energy per unit area per unit time is high), resulting in a strong burning or pain sensation in the human body, even beyond the human body's tolerance range. Therefore, the existing hair removal device must be equipped with a refrigeration component. Even after using the function of the refrigeration component, this burning or pain sensation is still unbearable, and the heat dissipation burden of the hair removal device's heat dissipation system is heavy. When the hair removal device is working continuously, the production effect cannot meet the use requirements.

[0003] Therefore existing technology still needs to be improved and improved. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a control circuit for a hair removal device, which can reduce the pain during hair removal.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A control circuit for a hair removal device includes a boost module, a function control module, an energy storage module, an energy output control module, and a processing module. When the hair removal device is turned on, the boost module boosts the power supply voltage to charge the energy storage module. When the function control module receives a hair removal instruction, the processing module discharges the energy storage module. At the same time, the energy output control module makes its output energy density less than a set energy density, thereby extending the energy output duration.

[0007] The control circuit of the hair removal device further includes a skin detection module. When the skin detection module detects that the energy output head of the hair removal device is in contact with the skin, the processing module controls the energy output control module to start.

[0008] The control circuit of the hair removal device also includes a skin color detection module for detecting skin color. The processing module is connected to the skin color detection module, and the energy output control module adjusts its output energy density according to the skin color, and controls the total energy output of the energy output control module according to the skin color.

[0009] In the control circuit of the hair removal device, the energy output control module includes an IGBT switch tube, a unidirectional thyristor, a common-mode inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a first diode and a second diode. The gate of the IGBT switch tube is connected to the energy driving end of the processing module through the first resistor, the collector of the IGBT switch tube is connected to the second pin of the energy output head, the emitter of the IGBT switch tube is connected to the positive electrode of the first diode, and is also connected to the positive electrode of the second diode and the anode of the unidirectional thyristor and the third pin of the common-mode inductor through the first capacitor. One end of the fourth resistor and the control electrode of the unidirectional thyristor are connected to the high-voltage pulse control end of the processing module through the second resistor, and are also connected to the cathode of the unidirectional thyristor and the first pin of the common-mode inductor through the third resistor. The second capacitor is connected in parallel with the third resistor. The second pin of the common-mode inductor is connected to the third pin of the energy output head. The other end of the fourth resistor and the first pin of the energy output head are connected to the positive electrode of the voltage detection module and the energy storage module.

[0010] The control circuit of the hair removal device also includes a voltage detection module for detecting the voltage position of the energy detection module. The voltage detection module includes a first transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor. The base of the first transistor is connected to the discharge drive end of the processing module through the fifth resistor, and the collector of the first transistor is connected to the first pin and the positive pole of the energy output head, one end of the seventh resistor, one end of the eighth resistor and the positive pole of the energy storage module through the sixth resistor. The emitter of the first transistor and the other end of the seventh resistor are grounded, and the other end of the eighth resistor is connected to the voltage detection end of the processing module through the tenth resistor and is also grounded through the ninth resistor.

[0011] In the control circuit of the hair removal device, the skin detection module includes a skin detection sensor interface, a touch chip and an eleventh resistor. The CIN0 pin of the touch chip is connected to the 1st pin of the skin detection sensor interface, the CIN1 pin of the touch chip is connected to the skin detection sensor interface through the eleventh resistor, and the OUT1 pin of the touch chip is connected to the touch detection end of the processing module.

[0012] The control circuit of the hair removal device also includes a cooling DC-DC step-down module, which is connected to the processing module and the cooling plate of the hair removal device to reduce the output voltage to a preset voltage and load it to the cooling plate, and the processing module controls the working state of the cooling plate; the cooling DC-DC step-down module includes a step-down chip, an inductor, a first MOS tube, a third capacitor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a seventeenth resistor. The SEN pin of the step-down chip is grounded through the twelfth resistor, the RT pin of the step-down chip is grounded through the thirteenth resistor, the FB pin of the step-down chip is connected to one end of the inductor and the second pin of the cooling plate interface through the fourteenth resistor, and is also grounded through the fifteenth resistor. The other end of the inductor is connected to the SW pin of the step-down chip and is also grounded through the third capacitor. The gate of the first MOS tube is connected to the cooling control end of the processing module through the sixteenth resistor and is also grounded through the seventeenth resistor. The drain of the first MOS tube is connected to the first pin of the cooling plate interface, and the source of the first MOS tube is grounded.

[0013] In the control circuit of the hair removal device, the boost module includes a power factor correction chip, a transformer, a second MOS tube, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a fourth capacitor, a fifth capacitor, a third diode, a fourth diode, a fifth diode, and a sixth diode. The INV pin of the power factor correction chip is connected to the cathode of the third diode, one end of the fourth capacitor, and one end of the nineteenth resistor. The anode of the third diode is connected to the boost control end of the processing module through the eighteenth resistor. The COMP pin of the power factor correction chip is connected to the other end of the fourth capacitor. The CS pin of the power factor correction chip is connected to the source of the second MOS tube and is also grounded through the twentieth resistor. The ZCD pin of the power factor correction chip is connected to the opposite-name end of the secondary winding of the transformer and the positive pole of the sixth diode through the twenty-fourth resistor. The negative pole of the sixth diode is connected to the positive pole of the energy storage module and is also connected to the same-name end of the secondary winding of the transformer and the ground through the sixth capacitor. The GD pin of the power factor correction chip is connected to the gate of the second MOS tube through the twenty-first resistor. The drain of the second MOS tube is connected to the opposite-name end of the primary winding of the transformer and the positive pole of the fifth diode. The VCC pin of the power factor correction chip is connected to the positive pole of the fourth diode. The negative pole of the fourth diode is connected to the power interface and the same-name end of the primary winding of the transformer through the twenty-second resistor. The negative pole of the fifth diode is connected to the same-name end of the primary winding of the transformer through the twenty-third resistor. The fifth capacitor is connected in parallel with the twenty-third resistor.

[0014] In the control circuit of the hair removal device, the skin color detection module includes: an amplifier chip, a second transistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a light emitting diode and a light receiving diode. The base of the second transistor is connected to the light-emitting control end of the processing module through the twenty-fifth resistor, the collector of the second transistor is connected to the cathode of the light-emitting diode, the anode of the light-emitting diode is connected to the VDD power supply end and the VCC pin of the amplifier chip through the twenty-sixth resistor, the OUT1 pin of the amplifier chip is connected to the skin color detection end of the processing module and is also connected to the cathode of the light receiving diode through the twenty-seventh resistor, and the anode of the light receiving diode is grounded.

[0015] The control circuit of the hair removal device further includes a fan driving module connected to the processing module. The fan driving module is controlled by the processing module to control the on / off state and speed of the fan.

[0016] Compared to the existing technology, the control circuit of the hair removal device provided by the present invention, upon receiving a hair removal instruction, causes the processing module to discharge the energy storage module. Simultaneously, the energy output control module causes the energy density of the output to be less than the set energy density, thereby extending the energy output duration. This reduces the burning or pain sensation during hair removal, prevents burns to the user's skin, and improves the user experience. Furthermore, the total energy of the hair removal device's output light remains unchanged, and the hair removal effect can achieve the desired effect. Furthermore, when the voltage of the energy storage module is lower than a preset value, the boost module boosts the input voltage to charge the energy storage module, ensuring that light output lasts for a sufficient period of time during hair removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a circuit schematic diagram of the energy storage module, boost module, energy output control module, fan drive module, and voltage detection module of the control circuit of the hair removal device provided by the present invention.

[0018] Figure 2 This is a circuit schematic diagram of the processing module and switch module of the control circuit of the hair removal device provided by the present invention.

[0019] Figure 3 This is a circuit schematic diagram of the skin detection module of the control circuit of the hair removal device provided by the present invention.

[0020] Figure 4 This is a circuit schematic diagram of the cooling DC-DC step-down module of the control circuit of the hair removal device provided by the present invention.

[0021] Figure 5 This is a circuit schematic diagram of the skin color detection module of the function control module of the control circuit of the hair removal device provided by the present invention.

[0022] Figure 6 This is a circuit schematic diagram of the functional control module of the control circuit of the hair removal device provided by the present invention.

[0023] Description of the accompanying drawings:

[0024] Switch module 1, function control module 2, energy storage module 3, boost module 4, energy output control module 5, skin detection module 6, skin color detection module 61, processing module 7, cooling DC-DC step-down module 8, fan drive module 9, voltage detection module 10, energy output head I PL, I GBT switch tube Q1, unidirectional thyristor SCR1, common-mode inductor L1, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, first capacitor C1, second capacitor C2, high-voltage capacitor C01, first diode D1, second diode D2, first transistor Q2, fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R8, ninth resistor R9, tenth resistor R10, skin detection sensor interface J1, microprocessor U1, touch chip U2, eleventh resistor R11, step-down chip U3, inductor L2, first MOS tube Q3, third capacitor C3, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, sixteenth resistor R16, seventeenth resistor R17, cooling plate interface J2, power factor correction chip U4, transformer T1, second MOS tube Q4, eighteenth resistor R18, nineteenth resistor R1 9. Twentieth resistor R20, twenty-first resistor R21, twenty-second resistor R22, twenty-third resistor R23, twenty-fourth resistor R24, fourth capacitor C4, fifth capacitor C5, third diode D3, fourth diode D4, fifth diode D5, sixth diode D6, amplifier chip U5, second transistor Q5, twenty-fifth resistor R25, twenty-sixth resistor R26, twenty-seventh resistor R27, light-emitting diode D7, light-receiving diode D8, third MOS transistor Q6, twenty-eighth resistor R28, twenty-ninth resistor R29, seventh diode D9, charging port J3, fan port J4, touch chip U6, thirtieth resistor R30, thirty-first resistor R31, thirty-second resistor R32, thirty-third resistor R33, thirty-fourth resistor R34, first touch electrode P1, second touch electrode P2, third touch electrode P3, fourth touch electrode P4, fifth touch electrode P5 DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] See also Figure 1 、 Figure 2 and Figure 6The control circuit of the hair removal device provided by the present invention includes a switch module 1, a function control module 2, an energy storage module 3, a boost module 4, an energy output control module 5 and a processing module 7. The switch module 1, the function control module 2, the energy storage module 3, the boost module 4 and the energy output control module 5 are all connected to the processing module 7, and the boost module 4 and the energy output control module 5 are connected to the energy storage module 3.

[0027] When the voltage of the energy storage module 3 is lower than the preset value or the hair removal device is turned on, the boost module 4 boosts the input voltage to charge the energy storage module 3, ensuring that the light can be output for a sufficient period of time during hair removal. When the function control module 2 receives the hair removal instruction given by the user, the processing module 7 discharges the energy storage module 3 and boosts the voltage through the boost module 4. At the same time, the energy output control module 5 makes its output energy density less than the set energy density, thereby extending the energy output duration. In other words, the processing module 7 controls the output power of the energy output control module 5 to be less than the rated power and extends the energy output time, so that the total energy of the light output by the energy output control module 5 remains unchanged. Even without releasing all the energy stored in the energy storage module 3, the hair removal effect can be achieved.

[0028] For example, the light energy output of the existing hair removal device is 16 joules, and the output duration is 3 milliseconds, which means the energy density is set to 53 joules / cm 2 / second, the present invention uses the energy output control module 5 to keep the light energy 16 joules unchanged, by reducing the energy density per unit time (such as 40 joules / cm 2 The device's output light energy lasts longer than 4 milliseconds, minimizing the sensation of heat or pain during hair removal, preventing burns and improving the user experience. Furthermore, the pain is within human tolerance, eliminating the need for cooling during use, and even eliminating the cooling module, thus reducing product costs. Furthermore, the total light energy output remains unchanged, and the hair removal effect remains as expected.

[0029] Please also refer to Figure 3 The control circuit of the hair removal device of the present invention also includes a skin detection module 6. When the skin detection module 6 detects that the energy output head IPL of the hair removal device is in contact with the skin, the processing module 7 controls the energy output control module 5 to turn on, thereby avoiding the hair removal device from outputting light when it is not in contact with the skin, thereby saving electric energy, ensuring the duration of each lighting, and avoiding strong light irritating the eyes of the user or operator.

[0030] Further, please also refer to Figure 5The control circuit of the hair removal device of the present invention also includes a skin color detection module 61 for detecting skin color. The processing module 7 is connected to the skin color detection module 61 and controls the energy output control module to adjust its output energy density according to the skin color, and controls the total energy output of the energy output control module according to the skin color. Specifically, when the skin color of the human body is detected to be dark, the processing module 7 controls the energy output control module to reduce the output power to reduce the energy density. For example, the darker the skin color, the lower the output energy density, and the total energy acting on dark skin is also less than that on light skin. In other words, when the present invention is removing hair on dark skin, it only needs to determine the required light energy output based on the skin color and control the energy output control module to output the corresponding energy, without releasing all the energy. This reduces the stinging sensation for users with dark skin and avoids burns to the skin of users with dark skin. The present invention detects the skin color of the human body through the skin color detection module 61, and realizes the control of the light energy density and the total energy output according to different skin colors, thereby protecting users with dark skin.

[0031] Optionally, the control circuit of the hair removal device may further include a fan drive module 9 connected to the processing module 7. The fan drive module 9 is controlled by the processing module 7 to control the on / off state and speed of the fan, thereby quickly dissipating the heat output when the hair removal device is turned on to extend the product life.

[0032] Furthermore, the control circuit of the hair removal device may also include a voltage detection module 10, which is connected to the energy storage module 3 and the processing module 7 and is used to detect the voltage level of the energy storage module 3, thereby controlling the charging level of the energy storage module 3. That is, when the voltage of the energy storage module 3 is at a low level, the processing module 7 uses a high voltage and a large current to charge the energy storage module 3 to prevent the high-voltage capacitor from over-discharging; conversely, when the voltage of the energy storage module 3 is at a high level, the processing module 7 uses a low voltage and a small current to charge the energy storage module 3, so that the energy storage module 3 is first charged quickly and then slowly, and finally fully charged.

[0033] Please continue reading Figure 1 and Figure 2 In the control circuit of the hair removal device of the present invention, the processing module 7 may include a CMS89F1232 microprocessor U1, a motherboard temperature detection resistor RT, and other components. When the temperature reported by the motherboard temperature detection resistor RT is excessive, the hair removal device enters a shutdown state for overheating protection. The energy storage module 3 may utilize a supercapacitor, which has a fast charging time, high current discharge capability, and a long service life. In this embodiment, the rated voltage of the energy storage module 3 can reach 480V.

[0034] The energy output control module 5 includes an IGBT switch tube Q1, a unidirectional thyristor SCR1, a common-mode inductor L1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a first diode D1 and a second diode D2. The model of the IGBT switch tube Q1 can be XNS25N120T, the model of the unidirectional thyristor SCR1 can be MCR100-8, and the third resistor R3 and the second capacitor C2 constitute an RC filter.

[0035] The gate of the IGBT switch tube Q1 is connected to the energy driving end of the processing module 7 (i.e., the RA1 / AN1 pin of the microprocessor U1) through the first resistor R1. The collector of the IGBT switch tube Q1 is connected to the second pin of the energy output header IPL. The emitter of the IGBT switch tube Q1 is connected to the anode of the first diode D1, and is also connected to the anode of the second diode D2, the anode of the thyristor SCR1, and the third pin of the common-mode inductor L1 through the first capacitor C1. One end of the fourth resistor R4 and the control electrode of the thyristor SCR1 are connected to the high-voltage pulse control end of the processing module 7 (i.e., the RA1 / AN1 pin of the microprocessor U1) through the second resistor R2, and are also connected to the cathode of the thyristor SCR1 and the first pin of the common-mode inductor L1 through the third resistor R3. The second capacitor C2 is connected in parallel with the third resistor R3. The second pin of the common-mode inductor L1 is connected to the third pin of the energy output header IPL. The other end of the fourth resistor R4 and the first pin of the energy output header IPL are connected to the voltage detection module 10 and the positive electrode of the energy storage module 3. The corresponding high-voltage pulse signal is output by the RA1 / AN1 pin of the microprocessor U1, which turns on the unidirectional thyristor SCR1 for rectification. After being filtered by the common-mode inductor L1 and the high-voltage capacitor C01, it is loaded to the third pin of the energy output head IPL. At the same time, the RA1 / AN1 pin of the microprocessor U1 outputs a high level to turn on the IGBT switch tube Q1, and the conduction time and output current can be controlled by the RA1 / AN1 pin. By turning on the IGBT switch tube Q1, the energy output head IPL is adjusted to output light with lower energy density and longer duration, such as making the light energy density per unit time lower than 40 joules / CM 2 / second, and the output duration is longer than 4 milliseconds, thereby reducing the hot or painful sensation during hair removal, preventing burns to the user's skin, and improving the user experience.

[0036] Please continue reading Figure 1 and Figure 2The voltage detection module 10 includes a first transistor Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The first transistor Q2 is an NPN transistor. When its base is at a high level, the first transistor Q2 is turned on. The eighth resistor R8 and the ninth resistor R9 constitute a voltage sampling resistor, which provides real-time feedback of the voltage value of the energy storage module 3 to the processing module 7, thereby enabling the microprocessor U1 to control the voltage and current of the RA1 / AN1 pin according to the voltage level of the energy storage module 3.

[0037] Specifically, the base of the first transistor Q2 is connected to the discharge drive end of the processing module 7 (i.e., the RA2 / AN2 pin of the microprocessor U1) through the fifth resistor R5, the collector of the first transistor Q2 is connected to the first pin and the positive electrode of the energy output head IPL, one end of the seventh resistor R7, one end of the eighth resistor R8, and the positive electrode of the energy storage module 3 through the sixth resistor R6, the emitter of the first transistor Q2 and the other end of the seventh resistor R7 are grounded, and the other end of the eighth resistor R8 is connected to the voltage detection end of the processing module 7 (i.e., the RA0 / AN0 pin of the microprocessor U1) through the tenth resistor R10 and is also grounded through the ninth resistor R9.

[0038] When the hair removal device is turned off or the voltage level of the energy storage module 3 changes from high to low, the RA2 / AN2 pin of the microprocessor U1 outputs a high level, turning on the first transistor Q2, thereby causing the voltage output by the boost module 4 to discharge the energy storage module 3 (i.e., the supercapacitor begins to charge). The voltage of the energy storage module 3 is then detected by the PB1 pin of the microprocessor U1. For example, if the voltage level of the energy storage module 3 is a high voltage of 280-380V, when the detected voltage level is less than 300V, the boost circuit discharges the energy storage module 3, i.e., the energy storage module 3 begins to charge.

[0039] Please also refer to Figure 3 The skin detection module 6 includes a skin detection sensor interface J1, a touch chip U2, and an eleventh resistor R11. The touch chip U2 can be a touch sensing chip model SC02B. The CIN1 pin of the touch chip U2 is connected to the skin detection sensor interface J1 via the eleventh resistor R11. The OUT1 pin of the touch chip U2 is connected to the touch detection terminal of the processing module 7 (i.e., the RA4 / AN4 pin of the microprocessor U1). When the skin detection sensor connected to the skin detection sensor interface J1 detects that the energy output head IPL contacts the skin, the sensor connected to the skin detection sensor interface J1 detects the skin, and the OUT1 pin of the touch chip U2 outputs a low level. This causes the RA1 / AN1 pin of the microprocessor U1 to receive feedback, causing its RA1 / AN1 pin to output a high level, thereby activating the energy output control module 5, thereby preventing waste of light energy and damage to the operator or user's eyes.

[0040] Please also refer to Figure 4 The control circuit of the hair removal device also includes a cooling DC-DC step-down module 8, which is connected to the processing module 7 and the cooling plate of the hair removal device, so that the output voltage is reduced to a preset voltage and loaded onto the cooling plate. The processing module 7 controls the working state of the cooling plate, and the DC-DC step-down module enables the cooling plate to cool while lighting, further reducing the user's pain.

[0041] The cooling DC-DC step-down module 8 includes a step-down chip U3, an inductor L2, a first MOS tube Q3, a third capacitor C3, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16 and a seventeenth resistor R17. The step-down chip U3 can be a step-down chip U3 with a model number of SC3987.

[0042] The SEN pin of the buck chip U3 is grounded through a twelfth resistor R12, the RT pin of the buck chip U3 is grounded through a thirteenth resistor R13, the FB pin of the buck chip U3 is connected to one end of the inductor L2 and the second pin of the cooling plate interface J2 through a fourteenth resistor R14, and is also grounded through a fifteenth resistor R15. The other end of the inductor L2 is connected to the SW pin of the buck chip U3 and is also grounded through a third capacitor C3. The gate of the first MOS transistor Q3 is connected to the cooling control end of the processing module 7 (i.e., the RA3 / AN3 pin of the microprocessor U1) through a sixteenth resistor R16 and is also grounded through a seventeenth resistor R17. The drain of the first MOS transistor Q3 is connected to the first pin of the cooling plate interface J2, and the source of the first MOS transistor Q3 is grounded. When the cooling function is turned on, the RA3 / AN3 pin of the microprocessor U1 outputs a high level to turn on the first MOS tube Q3. The voltage and current output by the buck chip U3 are loaded onto the cooling plate, which reduces the temperature of the energy output head, thereby further reducing the pain of human skin and further improving the user experience.

[0043] Please continue reading Figure 1 and Figure 2 The boost module 4 includes a power factor correction chip U4, a transformer T1, a second MOS tube Q4, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a fourth capacitor C4, a fifth capacitor C5, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6.

[0044] The INV pin of the power factor correction chip U4 is connected to the cathode of the third diode D3, one end of the fourth capacitor C4 and one end of the nineteenth resistor R19. The anode of the third diode D3 is connected to the boost control end of the processing module 7 (i.e., the AN13 / RB0 pin of the microprocessor U1) through the eighteenth resistor R18. The COMP pin of the power factor correction chip U4 is connected to the other end of the fourth capacitor C4. The CS pin of the power factor correction chip U4 is connected to the source of the second MOS tube Q4 and is also grounded through the twentieth resistor R20. The ZCD pin of the power factor correction chip U4 is connected to the opposite-name end of the secondary winding of the transformer T1 and the anode of the sixth diode D6 through the twenty-fourth resistor R24. The cathode of the sixth diode D6 is connected to The positive electrode of the energy storage module 3 is connected, and the same-name terminal of the secondary winding of the transformer T1 and the ground are also connected through the sixth capacitor. The GD pin of the power factor correction chip U4 is connected to the gate of the second MOS tube Q4 through the twenty-first resistor R21. The drain of the second MOS tube Q4 is connected to the opposite-name terminal of the primary winding of the transformer T1 and the positive electrode of the fifth diode D5. The VCC pin of the power factor correction chip U4 is connected to the positive electrode of the fourth diode D4. The cathode of the fourth diode D4 is connected to the power interface and the same-name terminal of the primary winding of the transformer T1 through the twenty-second resistor R22. The cathode of the fifth diode D5 is connected to the same-name terminal of the primary winding of the transformer T1 through the twenty-third resistor R23. The fifth capacitor C5 is connected in parallel with the twenty-third resistor R23.

[0045] The power factor correction chip U4 can be an integrated circuit model L6562D. The transformer T1 is a step-up transformer, the second MOS transistor Q4 is an N-channel MOS transistor, and the AN13 / RB0 pin of the microprocessor U1 is a boost control pin. When the hair removal device is powered on, the AN13 / RB0 pin of the microprocessor U1 outputs a high level to stop the boost. Alternatively, when the hair removal device is powered off, the AN13 / RB0 pin of the microprocessor U1 outputs a low level to enable the boost circuit to boost the voltage and charge the energy storage module.

[0046] Please also refer to Figure 1 、 Figure 2 and Figure 5The skin color detection module includes: an amplifier chip U5, a second transistor Q5, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a light emitting diode D7, and a light receiving diode D8. The base of the second transistor Q5 is connected to the light control terminal of the processing module U1 (i.e., the AN9 / RB4 pin of the microprocessor U1) through the twenty-fifth resistor R25. The collector of the second transistor Q5 is connected to the cathode of the light emitting diode D7. The anode of the light emitting diode D7 is connected to the VDD power supply terminal and the VCC pin of the amplifier chip U5 through the twenty-sixth resistor R26. The OUT1 pin of the amplifier chip U5 is connected to the skin color detection terminal of the processing module (i.e., the RA3 / AN3 pin of the microprocessor U1) and is also connected to the cathode of the light receiving diode D8 through the twenty-seventh resistor R27. The anode of the light receiving diode D8 is grounded. The energy output control module 5 is arranged around the energy output head IPL. When the energy output control module 5 is working, the AN9 / RB4 of the microprocessor U1 outputs a high level to turn on the second transistor Q5, causing the light emitting diode D7 to emit light, and the light receiving diode D8 receives the reflected light energy, and generates a corresponding voltage signal to be fed back to the RA3 / AN3 pin of the microprocessor U1. The user's skin color is analyzed based on the energy difference between the light energy emitted by the light emitting diode D7 and the light receiving diode D8.

[0047] Please continue reading Figure 1 The fan drive module 9 includes a third MOS transistor Q6, a twenty-eighth resistor R28, a twenty-ninth resistor R29, and a seventh diode D9. The gate of the third MOS transistor Q6 is connected to the AN11 / RB2 pin of the microprocessor U1 via the twenty-eighth resistor R28. The source of the third MOS transistor Q6 is grounded. The drain of the third MOS transistor Q6 is connected to the first pin of the fan interface J4 and the anode of the seventh diode D9. The second pin of the fan interface J4 is connected to the AN10 / RB3 pin of the microprocessor U1 via the twenty-ninth resistor R29. The cathode of the seventh diode D9 is connected to the charging port J3. The AN10 / RB3 pin of the microprocessor U1 is used to control the fan speed, and the AN11 / RB2 pin of the microprocessor U1 controls whether the fan is turned on or off.

[0048] Please also refer to Figure 6The function control module 2 includes a touch chip U6, a 30th resistor R30, a 31st resistor R31, a 32nd resistor R32, a 33rd resistor R33, a 34th resistor R34, a first touch electrode P1, a second touch electrode P2, a third touch electrode P3, a fourth touch electrode P4 and a fifth touch electrode P5. The TCH4 pin of the touch chip U6 is connected to the first touch electrode P1 through the 30th resistor R30, and the TCH3 pin of the touch chip U6 is connected to the first touch electrode P1 through the 31st resistor R31. The resistor R31 is connected to the second touch electrode P2, the TCH2 pin of the touch chip U6 is connected to the third touch electrode P3 through the thirty-second resistor R32, the TCH1 pin of the touch chip U6 is connected to the fourth touch electrode P4 through the thirty-third resistor R33, and the TCH0 pin of the touch chip U6 is connected to the fifth touch electrode P5 through the thirty-fourth resistor R34. The D4 pin, D3 pin, D2 pin, D1 pin, and D01 pin of the touch chip U6 are respectively connected to RA5 / AN5 of the microprocessor U1.

[0049] In an optional embodiment, the touch chip U6 can be an integrated chip of SC1066K, which receives the user's touch instructions such as continuous printing, gear increase, on / off, gear decrease, cooling, etc. through the first touch electrode P1, the second touch electrode P2, the third touch electrode P3, the fourth touch electrode P4, and the fifth touch electrode P5, and then the touch chip U6 feeds back to the microprocessor U1 to control the function of the hair removal device.

[0050] In summary, the control circuit of the hair removal device provided by the present invention, upon receiving a hair removal instruction, causes the processing module to discharge the energy storage module. Simultaneously, the energy output control module causes the energy density of the output to be less than the set energy density, thereby extending the energy output duration. This reduces the sensation of scalding or pain during hair removal, prevents burns to the user's skin, and improves the user experience. Furthermore, when the voltage of the energy storage module falls below a preset value or the hair removal device is turned off, the boost module boosts the input voltage to charge the energy storage module, ensuring that light output lasts for a sufficient period of time during hair removal.

[0051] In addition, the present invention can also use a fan to dissipate the heat generated by the hair removal device when it is emitting light, thereby preventing the internal temperature of the hair removal device from being too high. At the same time, a cooling DC-DC step-down module is added to cool down the device during the light output period, thereby further reducing the user's pain.

[0052] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A control circuit of a hair removal device, comprising a boost module, a function control module and an energy storage module, characterized in that: Also includes: Energy output control module, processing module and voltage detection module for detecting the voltage gear of the energy detection module. When the hair removal device is turned on, the boost module boosts the power supply voltage to charge the energy storage module. When the function control module receives the hair removal instruction, the processing module discharges the energy storage module. At the same time, the energy output control module makes its output energy density less than the set energy density, extending the energy output time. Specifically, the processing module controls the output power of the energy output control module to be less than the rated power and extends the energy output time, so that the total energy of the light output by the energy output control module remains unchanged, reducing the energy density per unit time; The energy output control module includes an IGBT switch tube, a unidirectional thyristor, a common-mode inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a first diode and a second diode. The gate of the IGBT switch tube is connected to the energy driving end of the processing module through the first resistor, the collector of the IGBT switch tube is connected to the second pin of the energy output head, the emitter of the IGBT switch tube is connected to the positive electrode of the first diode, and is also connected to the positive electrode of the second diode and the anode of the unidirectional thyristor and the third pin of the common-mode inductor through the first capacitor. One end of the fourth resistor and the control electrode of the unidirectional thyristor are connected to the high-voltage pulse control end of the processing module through the second resistor and are also connected to the unidirectional thyristor through the third resistor. The cathode of the energy output head and the first pin of the common-mode inductor are connected, the second capacitor is connected in parallel with the third resistor, the second pin of the common-mode inductor is connected to the third pin of the energy output head, and the other end of the fourth resistor and the first pin of the energy output head are connected to the positive electrode of the voltage detection module and the energy storage module; the RA1 / AN1 pin of the microprocessor outputs a corresponding high-voltage pulse signal, which turns on and rectifies the unidirectional thyristor, and is loaded to the third pin of the energy output head after filtering by the common-mode inductor and the high-voltage capacitor. At the same time, the RA1 / AN1 pin of the microprocessor outputs a high level to turn on the IGBT switch tube, and the conduction time and output current can be controlled by the RA1 / AN1 pin. The energy output head IPL is adjusted to output light with lower energy density and longer duration by turning on the IGBT switch tube; The voltage detection module includes a first transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor. The base of the first transistor is connected to the discharge drive end of the processing module through the fifth resistor. The collector of the first transistor is connected to the first pin of the energy output head and the positive electrode, one end of the seventh resistor, one end of the eighth resistor, and the positive electrode of the energy storage module through the sixth resistor. The emitter of the first transistor and the other end of the seventh resistor are grounded. The other end of the eighth resistor is connected to the voltage detection end of the processing module through the tenth resistor and is also grounded through the ninth resistor. The first transistor is an NPN transistor. When its base is at a high level, the first transistor is turned on. The eighth and ninth resistors constitute a voltage sampling resistor, which feeds back the voltage value of the energy storage module to the processing module in real time, so that the microprocessor controls the voltage and current of the RA1 / AN1 pin according to the voltage level of the energy storage module.

2. The control circuit of the hair removal device according to claim 1, characterized in that: It also includes a skin detection module. When the skin detection module detects that the energy output head of the hair removal device is in contact with the skin, the processing module controls the energy output control module to start.

3. The control circuit of the hair removal device according to claim 2, characterized in that: It also includes a skin color detection module for detecting skin color. The processing module is connected to the skin color detection module, and the energy output control module adjusts its output energy density according to the skin color, and controls the total energy output of the energy output control module according to the skin color.

4. The control circuit of the hair removal device according to claim 2, characterized in that: The skin detection module includes a skin detection sensor interface, a touch chip and an eleventh resistor. The CIN1 pin of the touch chip is connected to the skin detection sensor interface through the eleventh resistor, and the OUT1 pin of the touch chip is connected to the touch detection end of the processing module.

5. The control circuit of the hair removal device according to claim 1, characterized in that: It also includes a cooling DC-DC step-down module, which is connected to the processing module and the cooling plate of the hair removal device, so that the output voltage is reduced to a preset voltage and loaded onto the cooling plate, and the processing module controls the working state of the cooling plate; the cooling DC-DC step-down module includes a step-down chip, an inductor, a first MOS tube, a third capacitor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a seventeenth resistor. The SEN pin of the step-down chip is grounded through the twelfth resistor, the RT pin of the step-down chip is grounded through the thirteenth resistor, the FB pin of the step-down chip is connected to one end of the inductor and the second pin of the cooling plate interface through the fourteenth resistor, and is also grounded through the fifteenth resistor. The other end of the inductor is connected to the SW pin of the step-down chip and is also grounded through the third capacitor. The gate of the first MOS tube is connected to the cooling control end of the processing module through the sixteenth resistor and is also grounded through the seventeenth resistor. The drain of the first MOS tube is connected to the first pin of the cooling plate interface, and the source of the first MOS tube is grounded.

6. The control circuit of the hair removal device according to claim 1, characterized in that: The boost module includes a power factor correction chip, a transformer, a second MOS tube, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a fourth capacitor, a fifth capacitor, a third diode, a fourth diode, a fifth diode, and a sixth diode. The INV pin of the power factor correction chip is connected to the cathode of the third diode, one end of the fourth capacitor, and one end of the nineteenth resistor. The anode of the third diode is connected to the boost control end of the processing module through the eighteenth resistor. The COMP pin of the power factor correction chip is connected to the other end of the fourth capacitor. The CS pin of the power factor correction chip is connected to the source of the second MOS tube and is also grounded through the twentieth resistor. The ZCD pin is connected to the opposite-name end of the secondary winding of the transformer and the positive pole of the sixth diode through the twenty-fourth resistor. The negative pole of the sixth diode is connected to the positive pole of the energy storage module and is also connected to the same-name end of the secondary winding of the transformer and the ground through the sixth capacitor. The GD pin of the power factor correction chip is connected to the gate of the second MOS tube through the twenty-first resistor. The drain of the second MOS tube is connected to the opposite-name end of the primary winding of the transformer and the positive pole of the fifth diode. The VCC pin of the power factor correction chip is connected to the positive pole of the fourth diode. The negative pole of the fourth diode is connected to the power interface and the same-name end of the primary winding of the transformer through the twenty-second resistor. The negative pole of the fifth diode is connected to the same-name end of the primary winding of the transformer through the twenty-third resistor. The fifth capacitor is connected in parallel with the twenty-third resistor.

7. The control circuit of the hair removal device according to claim 3, characterized in that: The skin color detection module includes: an amplifier chip, a second transistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a light emitting diode, and a light receiving diode. The base of the second transistor is connected to the light-emitting control terminal of the processing module via the twenty-fifth resistor, the collector of the second transistor is connected to the cathode of the light emitting diode, the anode of the light emitting diode is connected to the VDD power supply terminal and the VCC pin of the amplifier chip via the twenty-sixth resistor, the OUT1 pin of the amplifier chip is connected to the skin color detection terminal of the processing module and is also connected to the cathode of the light receiving diode via the twenty-seventh resistor, and the anode of the light receiving diode is grounded.

8. The control circuit of the hair removal device according to claim 1, characterized in that: It also includes a fan driving module connected to the processing module. The fan driving module is controlled by the processing module to control the opening and closing state and the speed of the fan.

Images