Hair removal instrument assembly with pluggable host and pluggable power supply

Abstract

The invention provides a hair removal instrument assembly with a pluggable host and a pluggable power supply. The hair removal instrument assembly comprises an alternating current-direct current high-voltage power supply module, an alternating current-direct current low-voltage power supply module, a high-voltage power supply auxiliary module, a lamp tube charging capacitor, an on-off detection circuit, a single-chip microcomputer control circuit and a lighting lamp tube circuit, wherein the alternating current-direct current low-voltage power supply module supplies power to the on-off detection circuit and the single-chip microcomputer control circuit; the alternating current-direct current power supply module, the high-voltage power supply auxiliary module, the on-off detection circuit and the lamp tube charging capacitor are all integrated in an independent power supply device, and the single chip microcomputer control circuit and the lighting lamp tube circuit are integrated in the hair removal instrument host; the on-off detection circuit is used for detecting the on-off of the power supply device and the hair removal instrument host, and when the power supply device and the hair removal instrument host are connected, the lamp tube charging capacitor is charged to the working voltage of the lamp tube. The depilation instrument assembly can perfectly solve the problem of long time interval between insertion and extraction and twice lighting.

Description

Background Technology

[0001] Currently, there are two main types of hair removal devices. One type has a low-voltage 12V power output that can be plugged into the device itself, but the interval between two pulses is very long, typically several to over ten seconds, resulting in a poor user experience. The other type has a 320V high-voltage and 12V low-voltage power output integrated with the device itself, making it inconvenient to store. While this type of device significantly reduces the interval between two pulses, it is still greater than 1 second, and the user experience is still not good.

[0002] Currently, there are two types of laser hair removal devices on the market: those that allow the power supply and the main unit to be plugged in and out; and those where the power supply and the main unit are integrated and cannot be plugged in and out.

[0003] like Figure 1The diagram shows a basic principle block diagram of a hair removal device assembly in the prior art that allows for plugging and unplugging of the power supply and the main unit. The hair removal device assembly mainly includes an AC / DC isolated power supply circuit 101, an internal boost circuit 102, a microcontroller control circuit 103, a light lamp circuit 104, and a cooling fan 105. The internal boost circuit 102, microcontroller control circuit 103, light lamp circuit 104, and cooling fan circuit 105 are all integrated inside the main unit of the hair removal device, while the AC / DC isolated power supply circuit 101 is integrated into a separate power supply unit. The main unit and the power supply unit are pluggable. The AC / DC isolated power supply circuit 101 includes a common-mode circuit connected to the live and neutral wires, a rectifier bridge connected to the common-mode circuit, a charging capacitor connected to the output terminal of the rectifier bridge, and the high-voltage side of the primary winding of the transformer. Therefore, the high-voltage side of the charging capacitor and the high-voltage side of the primary winding are the rectified high voltage. In addition, an RCD clamping circuit is connected in parallel across the two ends of the primary winding to suppress the induced voltage spikes. The low-voltage side of the primary winding is grounded through a switching transistor, and the gate of the switching transistor is connected to the Gate pin of the flyback power control chip Chip1, thus forming a flyback switching power supply. The basic working principle and process of the flyback switching power supply are as follows: the flyback chip controls the switching transistor to turn on and off. When the switching transistor is turned on, the current in the primary winding increases, the magnetic field in the core is strengthened and energy is stored. At this time, the secondary winding generates a reverse voltage, the diode does not conduct, and the output capacitor provides a DC voltage of 5-24V to power the hair removal device. When the switching transistor is turned off, the primary winding current is zero, the magnetic field in the core begins to decrease, and a positive voltage is generated in the secondary winding. The diode conducts to charge the capacitor and simultaneously provides a DC (dc) voltage of 5-24V to power the hair removal device. The internal boost circuit 102 of the hair removal device includes a BOOST boost circuit control chip Chip2, which is used to realize the boost control of the circuit. The boosted DC (dc) voltage of 320V is used to charge the lamp charging capacitor C0. The lamp charging capacitor C0 is connected to the lighting lamp circuit 104 to power the lamp. In addition, the microcontroller control circuit 103 has a microcontroller chip Chip3, which is used to realize the working mode control of the hair removal device itself.

[0004] The basic working principle of this type of hair removal device is as follows: AC mains power is converted into low-voltage 5-24V DC power (a safe voltage, so it can be plugged into and unplugged from the hair removal device main unit) through AC / DC isolation power supply circuit 101. The low-voltage DC power enters the hair removal device and is stepped down to power the microcontroller control circuit. Simultaneously, the internal boost circuit 102 boosts the voltage to approximately 320V to charge the 600-1500uF / 350V large-capacity lamp charging capacitor C0. When the large electrolytic capacitor is fully charged, the user presses the light-emitting button switch, and the microcontroller control circuit 103 sends a control command to turn on the light-emitting lamp circuit. The large electrolytic capacitor discharges to the light-emitting lamp, thus emitting light. The strong light is absorbed by the melanin in the hair follicles and converted into heat energy, thereby destroying the hair follicle structure and inhibiting hair regrowth.

[0005] In the circuitry of this type of hair removal device, the mains power is converted to 320V through two stages of circuitry, with each stage having relatively low power to avoid potential safety hazards. Specifically, the peak power of the AC / DC isolated power supply circuit 101 is less than 50W, and the power of the internal boost circuit 102 is also relatively low due to the size limitations of the device itself. This results in a long time (generally several seconds to tens of seconds) required to fully charge the large-capacity lamp charging capacitor C0. The user typically presses the activation button once every 0.2-0.8 seconds. This results in a long waiting time for each activation, especially after each activation, as the large electrolytic capacitor needs to be fully charged before the next activation, leading to a poor user experience. The biggest advantage of this type of hair removal device is that the power supply and the device are detachable, allowing for convenient storage when not in use. However, the disadvantage is the excessively long interval between activations.

[0006] like Figure 2The diagram shows the basic principle block diagram of a conventional hair removal device assembly where the power supply and the main unit are integrated and cannot be detached. The hair removal device assembly mainly includes an AC / DC power supply circuit 201, a microcontroller control circuit 202, a light lamp circuit 203, and a heat dissipation and semiconductor cooling circuit 204. The microcontroller control circuit 202, the light lamp circuit 203, and the heat dissipation and semiconductor cooling circuit 204 are all integrated inside the main unit. The AC / DC power supply circuit 201 is separately integrated and fixedly connected to the main unit via a non-detachable connection cable; therefore, the power supply and the main unit cannot be detached. The AC / DC power supply circuit 201 includes a common-mode circuit connected to the live and neutral wires, a rectifier bridge connected to the common-mode circuit, and the high-voltage side of a charging capacitor connected to the output of the rectifier bridge. The high-voltage side of this charging capacitor is also connected to the high-voltage side of the primary windings of two transformers. An RCD clamping circuit is connected in parallel across the two ends of each primary winding to suppress induced voltage spikes. The low-voltage side of each primary winding is grounded through a switching transistor, and the gate of the switching transistor is connected to the Gate pin of the flyback power control chip Chip1. This allows the primary winding to supply power to the secondary winding when the switching transistor is off, thus achieving a flyback switching power supply and suppressing electromagnetic interference to the power grid. One secondary winding receives a DC voltage of 320V, which is connected to the lamp charging capacitor C0 to charge it. The lamp charging capacitor C0 is connected to the lighting circuit 104 to power the lamp. The other secondary winding receives a DC voltage of 12V, which is connected to the heat dissipation and semiconductor cooling circuit 204 and the microcontroller control circuit 202 to power both. Furthermore, the microcontroller control circuit 202 has a microcontroller chip Chip3 for controlling the operating mode of the hair removal device itself.

[0007] The basic working principle of this type of hair removal device is as follows: AC mains power is supplied to the microcontroller control circuit via a low-voltage 12V circuit (AC / DC power circuit 201) after being stepped down. This low voltage also directly powers the cooling fan and semiconductor cooling circuit. A high-voltage 320V circuit directly charges the large-capacity 1000-4000uF / 350V lamp charging capacitor C0 in the power supply unit (this high-voltage capacitor cannot be plugged into or unplugged from the main unit). Once the lamp charging capacitor C0 is fully charged, the user presses the illumination button. The microcontroller control circuit 202 sends a control command to activate the illumination lamp circuit, causing the large electrolytic capacitor to discharge into the lamp, thus illuminating it. The intense light is absorbed by the melanin in the hair follicles and converted into heat energy, thereby damaging the hair follicle structure and inhibiting hair regrowth.

[0008] In the circuitry of this type of hair removal device, the AC / DC power supply circuit 201 outputs a 320V high voltage, and the size of the power supply unit is not limited. The peak power of the high-voltage section can reach 100 watts, so the charging speed for large electrolytic capacitors is faster than that of hair removal device components that allow the power supply and the hair removal device unit to be plugged in and out, generally achieving a full charge in 1-3 seconds. However, users still need to wait a relatively long time after each use of this type of hair removal device. Although the interval between two uses is significantly shorter than that of hair removal device components that allow the power supply and the hair removal device unit to be plugged in and out, users still need to wait noticeably, resulting in a less than ideal user experience. The biggest drawback of this type of hair removal device is that the power supply unit and the hair removal device unit are fixedly connected (i.e., not pluggable), making storage extremely inconvenient for users. Summary of the Invention

[0009] The purpose of this invention is to provide a hair removal device assembly with a pluggable main unit and power supply, so as to achieve safe pluggable and unpluggable power supply and hair removal device main unit, while greatly shortening the time interval of light application.

[0010] To achieve the above objectives, the present invention provides a hair removal device assembly with a pluggable main unit and power supply, comprising an AC-DC high-voltage power supply module, an AC-DC low-voltage power supply module powered by the AC-DC high-voltage power supply module, a high-voltage power supply auxiliary module, and a lamp charging capacitor, a continuity detection circuit and a microcontroller control circuit powered by the AC-DC low-voltage power supply module, and a lighting lamp circuit connected to the lamp charging capacitor; wherein, the AC-DC high-voltage power supply module, the AC-DC low-voltage power supply module, the high-voltage power supply auxiliary module, the continuity detection circuit, and the lamp charging capacitor are all integrated in a separate power supply device, the microcontroller control circuit and the lighting lamp circuit are integrated in the hair removal device main unit, and the power supply device and the hair removal device main unit are pluggable; the continuity detection circuit is used to detect the continuity between the power supply device and the hair removal device main unit, and when the power supply device and the hair removal device main unit are connected, the lamp charging capacitor is charged to the lamp operating voltage.

[0011] The AC-DC high-voltage power supply module includes a preliminary AC-DC conversion circuit, a power factor correction BOOST boost circuit and an LLC resonant half-bridge circuit that can be switched between an operating state and a shutdown state. The common voltage output terminal of the preliminary AC-DC conversion circuit and the power factor correction BOOST boost circuit serves as the first power supply terminal. The voltage input terminal of the LLC resonant half-bridge circuit is connected to the first power supply terminal, and its output terminal is connected to the lamp charging capacitor. The AC-DC low-voltage power supply module and the high-voltage power supply auxiliary module are both connected to the first power supply terminal.

[0012] The on / off detection circuit includes a reference voltage comparison circuit and a microcontroller activation judgment circuit. The reference voltage comparison circuit is configured to detect the detection ground voltage of the negative terminal of the working device of the microcontroller control circuit and the cooling circuit, and when the detection ground voltage exceeds the reference voltage, it determines that the detection AC-DC low voltage power supply module is connected to the hair removal device host and triggers the first trigger-type switching device. The microcontroller activation judgment circuit is configured to detect the level of the activation output pin of the microcontroller control circuit, so as to output an activation logic signal to trigger the second trigger-type switching device when the microcontroller control circuit is in the working state.

[0013] The continuity detection circuit includes a first trigger switch and a second trigger switch connected in series. If the power supply and the hair removal device are connected, both the first trigger switch and the second trigger switch are triggered to conduct, so that the lamp charging capacitor is charged to the lamp operating voltage by the output voltage of the LLC resonant half-bridge circuit; otherwise, the lamp charging capacitor stops charging.

[0014] The first and second trigger switches are connected in series between the output voltage of the high-voltage power supply auxiliary module and the power supply pins of the BOOST boost circuit and the LLC resonant half-bridge circuit chip; or, the first and second trigger switches are connected in series between the voltage input terminal and the first power supply terminal of the LLC resonant half-bridge circuit; or, the first and second trigger switches are connected in series between the voltage output terminal and the lamp charging capacitor of the LLC resonant half-bridge circuit; or, the first and second trigger switches are connected in series between the rectifier bridge of the preliminary AC-DC conversion circuit and the power factor correction BOOST circuit; or, the first and second trigger switches are connected in series between the AC input terminal and the rectifier bridge of the preliminary AC-DC conversion circuit.

[0015] The continuity detection circuit includes a first trigger switch and a second trigger switch connected in parallel, with one end of each trigger switch grounded so that when the circuit is on, the voltage at the other end of the first trigger switch and the second trigger switch is pulled down to ground. If the power supply and the hair removal device are connected, both the first trigger switch and the second trigger switch are triggered to disconnect so that the lamp charging capacitor is charged to the lamp operating voltage by the output voltage of the LLC resonant half-bridge circuit. Otherwise, the lamp charging capacitor stops charging.

[0016] The first and second trigger-type switching devices are connected in parallel, with one end grounded and the other end connected between the output voltage of the high-voltage power supply auxiliary module and the power supply pin of the LLC resonant half-bridge circuit chip.

[0017] The first and second trigger-type switching devices include at least one of optocouplers, relays, thyristors, and MOSFETs.

[0018] The AC-DC low-voltage power supply module is an isolated power circuit module powered by the first power supply terminal Vbus, which adopts a flyback switching power supply; the high-voltage power supply auxiliary module is a non-isolated power circuit module powered by the first power supply terminal Vbus, which adopts a BUCK circuit module.

[0019] The power supply unit integrates a fast discharge circuit connected to the lamp charging capacitor. When the source device and the hair removal device main unit are detected to be disconnected, the fast discharge circuit discharges the charge on the lamp charging capacitor. In addition, the hair removal device main unit integrates a cooling circuit powered by an AC-DC low-voltage power supply module.

[0020] Using this power supply allows for easy plugging and unplugging of the hair removal device main unit for convenient storage by the user. At the same time, it can reduce the minimum interval between two light treatments of the hair removal device to within 100ms (the interval between two light treatments is shortened to a time that the user cannot perceive as a significant waiting time).

[0021] This invention mainly solves the problems of inconvenient storage and inability to quickly apply light to hair removal devices. The hair removal device component of this invention can perfectly solve the problems of long insertion and removal times and long intervals between two light applications, which can be kept within 100ms. It can also effectively reduce the capacitance value of large capacitors. Attached Figure Description

[0022] Figure 1 This is a basic principle block diagram of a hair removal device component that supports plugging and unplugging of the power supply and the main unit of the hair removal device in the existing technology.

[0023] Figure 2 This is a basic principle block diagram of a hair removal device component that integrates the power supply and the main unit, making it non-removable, in existing technologies.

[0024] Figure 3 This is a basic principle block diagram of a hair removal device assembly with a pluggable host and power supply according to the present invention. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] Figure 3 This is a basic principle block diagram of a hair removal device assembly with a detachable main unit and power supply according to the present invention. Figure 3As shown, a hair removal device assembly with a pluggable main unit and power supply according to the present invention includes an AC-DC high-voltage power supply module 10, an AC-DC low-voltage power supply module 20 powered by the AC-DC high-voltage power supply module 10, a high-voltage power supply auxiliary module 30, and a lamp charging capacitor C0, a continuity detection circuit 40, a microcontroller control circuit 60, a cooling circuit 70 powered by the AC-DC low-voltage power supply module 20, and a lighting lamp circuit 80 connected to the lamp charging capacitor C0. The lamp start switch in the lighting lamp circuit 80 is connected to a pin of the microcontroller control circuit 60 to trigger the switch. The lamp charging capacitor C0 is also connected to a fast discharge circuit 50 to discharge charge when the power supply and the hair removal device main unit are disconnected.

[0027] Among them, the AC-DC high voltage power supply module 10, AC-DC low voltage power supply module 20, high voltage power supply auxiliary module 30, continuity detection circuit 40, and fast discharge circuit 50 are all integrated into an independent power supply unit. The microcontroller control circuit 60, cooling circuit 70, and light lamp circuit 80 are integrated into the hair removal device main unit, and the power supply unit and the hair removal device main unit are pluggable.

[0028] The AC-DC high-voltage power supply module 10 includes a preliminary AC-DC conversion circuit 11, a power factor correction (PFC) boost circuit 12 switchable between operating and off states, and an LLC resonant half-bridge circuit 13. The common voltage output terminal of the preliminary AC-DC conversion circuit 11 and the power factor correction boost circuit 12 serves as the first power supply terminal Vbus. The voltage input terminal Vin1 of the LLC resonant half-bridge circuit 13 is connected to the first power supply terminal Vbus, and its output terminal is connected to the lamp charging capacitor C0. The high-voltage side of the lamp charging capacitor C0 is connected to the positive terminal of the lamp in the lighting circuit 80 to supply power to the lamp. The lamp is preferably an IPL laser lamp.

[0029] The preliminary AC-DC conversion circuit 11 includes a common-mode circuit, a rectifier bridge, one end of a first filter capacitor C1, a first inductor L1, a first diode D1, and one end of a second filter capacitor C2, all connected in sequence to the AC input terminal. The other ends of both the first filter capacitor C1 and the second filter capacitor C2 are grounded. The connection point of the first diode D1 and the second filter capacitor C2 is the first power supply terminal Vbus.

[0030] The power factor correction BOOST boost circuit 12 includes a first switching transistor M1, a first inductor L1, a first diode D1, and a second filter capacitor C2. The drain of the first switching transistor M1 is connected to the junction of the first inductor L1 and the first diode D1, the source of the first switching transistor M1 is grounded through a resistor, and the gate of the first switching transistor M1 is connected to the power factor correction circuit control chip U1. The power factor correction circuit control chip U1 is an NCP1654, suitable for BOOST boost circuits. It has a power supply pin VCC, a ground pin GND (grounded), an undervoltage lockout pin BO, a bus monitoring pin BM (grounded through a parallel capacitor and resistor, and grounded to the input terminal of the first inductor L1 through a resistor), a gate pin GATE, a current sampling pin CS (connected to the source of the first switching transistor M1), a feedback pin FB (connected to the voltage divider signal of the first power supply terminal Vbus), and an input voltage synchronization pin Vcos (grounded through a parallel capacitor and resistor).

[0031] Therefore, when the power factor correction circuit control chip U1 is working, the power factor correction circuit control chip U1, the first switching transistor M1, the first inductor L1, the first diode D1, and the feedback network together form the power factor correction BOOST boost circuit 12, realizing the boost function. The output terminal of the BOOST boost circuit has a large electrolytic capacitor (i.e., the first inductor L1), so the output voltage is not pulled down too much when supplying power to the outside, thus providing sufficient energy to the subsequent LLC in a short time.

[0032] The LLC resonant half-bridge circuit 13 includes a first half-bridge switch Q1, a second half-bridge switch Q2, and ground connected in series from the first power supply terminal Vbus. The connection point of the first half-bridge switch Q1 and the second half-bridge switch Q2 is connected in series to the resonant inductor Lr, the primary coil Np of the transformer, the resonant capacitor Cr, and ground. The primary coil Np of the transformer is positioned relative to the two series-connected secondary windings NS1 and NS2 of the transformer. Each of the secondary windings NS1 and NS2 is connected to a rectifier diode D2 and a rectifier diode D3. The common output terminal of the rectifier diodes D2 and D3 serves as the output terminal of the LLC resonant half-bridge circuit 13 and is connected to the lamp charging capacitor C0. The negative terminal of the lamp charging capacitor C0 is connected to the connection point of the secondary windings NS1 and NS2. The gates of the first half-bridge switch Q1 and the second half-bridge switch Q2 are connected to the first gate pin GATEA and the second gate pin GATEB of the LLC resonant half-bridge control chip U2. The LLC resonant half-bridge control chip U2 is model NCP13992. It is used to drive the first half-bridge switch Q1 and the second half-bridge switch Q2 to convert the output voltage (i.e., 450V) of the power factor correction BOOST boost circuit 12 into a 320V voltage.

[0033] Therefore, when the BOOST power factor correction (PFC) circuit 12 and the LLC resonant half-bridge circuit 13 are in the off state, the voltage value of the first power supply terminal Vbus is the rectified voltage obtained by the preliminary AC-DC conversion circuit 11, which is 220V × 1.414. When the BOOST power factor correction (PFC) circuit 12 and the LLC resonant half-bridge circuit 13 are in the working state, the voltage value of the first power supply terminal Vbus is the output voltage of the BOOST power factor correction (PFC) circuit 12, which is a DC voltage of 450V. The voltage of the first power supply terminal Vbus is used to supply the LLC resonant half-bridge circuit 13, the AC-DC low-voltage power supply module 20, and the high-voltage power supply auxiliary module 30. The BOOST power factor correction (PFC) circuit 12 boosts the 90-265V AC mains voltage to a DC voltage of 450V, so that the input AC voltage and current are in phase, making the power factor close to 1, reducing grid harmonic pollution, reducing grid reactive power, reducing THD, and increasing the PF value to make the power supply meet regulatory requirements.

[0034] The AC-DC low-voltage power supply module 20 and the high-voltage power supply auxiliary module 30 are both connected to and powered by the first power supply terminal Vbus. The AC-DC low-voltage power supply module 20 is an isolated power circuit module powered by the first power supply terminal Vbus. It preferably uses a flyback switching power supply, and its main function is to control the second switching transistor M2 to isolate and convert a 450V voltage to a 12V voltage. The isolated 12V output voltage powers the continuity detection circuit 40, the microcontroller control circuit 60, and the cooling circuit 70. In this embodiment, the AC-DC low-voltage power supply module 20 includes a high-voltage side of the primary winding NL1 of the low-voltage section connected to the first power supply terminal Vbus. An RCD clamping circuit is connected in parallel across the two ends of the primary winding NL1 of the low-voltage section to suppress the induced voltage spikes. The low-voltage side of the primary winding NL1 of the low-voltage section is grounded through a second switch M2 and a resistor. The gate of the second switch M2 is connected to the Gate pin of the flyback control chip U5. The primary winding NL1 of the low-voltage section is positioned relative to the secondary winding NL2 of the low-voltage section. The high-voltage end of the secondary winding NL2 of the low-voltage section is connected to the output diode D4. The output end of the output diode D4 is connected to the low-voltage side of the secondary winding NL2 of the low-voltage section through the low-voltage power supply output capacitor CL. The low-voltage side of the secondary winding NL2 of the low-voltage section is grounded.

[0035] The flyback control chip U5 is used to ensure that the primary winding NL1 of the low-voltage section supplies power to the secondary winding NL2 of the low-voltage section when the second switching transistor M2 is turned off, thereby achieving voltage isolation between the flyback switching power supply and the secondary winding. The voltage obtained by the secondary winding is a DC (dc) voltage of 12V. The 12V voltage generated by the AC-DC low-voltage power supply module 20 is isolated from the first power supply terminal Vbus. The 12V voltage is used to power the continuity detection circuit 40 and to power the microcontroller control circuit 60 and the cooling circuit 70 when the power supply unit and the hair removal device are connected. The cooling circuit 70 includes a semiconductor cooling chip and a cooling fan. Because the power supply unit and the hair removal device are pluggable, the 12V is isolated mainly to ensure safety when supplying power to the microcontroller control circuit 60 and the cooling circuit 70. By using the AC-DC low-voltage power supply module 20, if a short circuit or other abnormal situation occurs in the circuit, there will be no risk of electric shock if a person touches the 12V pin or socket, because the 12V is isolated from the input power grid through the flyback switching power supply.

[0036] The high-voltage power supply auxiliary module 30 is a non-isolated power circuit module powered by the first power supply terminal Vbus. It preferably uses a BUCK circuit module to convert AC to DC and provide the power supply voltage for the BOOST boost circuit 12 and LLC resonant half-bridge circuit 13 (specifically, chips U1 and U2 of these two circuits). Since the high-voltage power supply auxiliary module 30 is non-isolated, meaning the 18V ground is the same as the rectifier bridge ground, the generated 18V voltage primarily powers chips U1 and U2. The auxiliary power supply uses a non-isolated 18V to power the internal chips U1 and U2. The power supply is ultimately housed in a plastic casing, preventing human contact with the 18V voltage and thus eliminating the risk of electric shock. In this embodiment, the BUCK circuit module includes a BUCK buck control chip U6 (model LP2061), which includes an input pin C (connected to the first power supply terminal Vbus), a feedback pin FB (connected to the output voltage 18V through a resistor), a control pin GND (connected to the switching node SW), and a VCC clamp / undervoltage protection pin (connected to the switching node through a protection capacitor). The switching node SW is grounded through a reverse diode and connected to the output terminal of the high-voltage power supply auxiliary module 30 through an inductor. The output terminal of the high-voltage power supply auxiliary module 30 is grounded through an output capacitor.

[0037] As mentioned above, the power supply terminals of the continuity detection circuit 40 and the microcontroller control circuit 60 are both connected to the AC-DC low-voltage power supply module 20.

[0038] The continuity detection circuit 40 is used to detect the continuity between the power supply device and the hair removal device main unit. When the power supply device and the hair removal device main unit are connected, the lamp charging capacitor C0 in the power supply device is charged to the lamp working voltage (i.e., 320V).

[0039] The continuity detection circuit 40 includes a reference voltage comparison circuit 41 and a microcontroller activation judgment circuit 42. The reference voltage comparison circuit 41 detects the detection ground voltage of the negative terminals of the working devices in the microcontroller control circuit 60 and the cooling circuit 70. When the detection ground voltage exceeds the reference voltage, it determines that the AC-DC low-voltage power supply module 20 is connected to the hair removal device host and that the first optocoupler U3 is turned on. The microcontroller activation judgment circuit 42 detects the level of the activation output pin PB5 of the microcontroller control circuit 60, so that when the microcontroller control circuit 60 is in the working state, it outputs an activation logic signal (i.e., a low level) to drive the second optocoupler U4 to turn on. When both the first optocoupler U3 and the second optocoupler U4 are turned on, the power supply voltage causes the power factor correction BOOST boost circuit 12 and the LLC resonant half-bridge circuit 13 to switch to the working state, charging the lamp charging capacitor C0 through the output terminal of the LLC resonant half-bridge circuit 13. Therefore, only when the power supply and the hair removal device are connected will the reference voltage comparison circuit 41 and the microcontroller activation judgment circuit 42 control the first optocoupler U3 and the second optocoupler U4 to conduct simultaneously, thereby supplying 18V voltage to chips U1 and U2. This causes the power factor correction BOOST boost circuit 12 and the LLC resonant half-bridge circuit 13 to switch to working state. At this time, the output of the LLC resonant half-bridge circuit 13 will charge the lamp charging capacitor C0, and the output of the LLC resonant half-bridge circuit 13 will generate 320V high-voltage DC power. When the power supply is not connected to the hair removal device, the first optocoupler U3 and the second optocoupler U4 will not conduct simultaneously, the power factor correction BOOST boost circuit 12 and the LLC resonant half-bridge circuit 13 will not work, and the output of the LLC resonant half-bridge circuit 13 will not output high voltage. The lamp charging capacitor C0 cannot be charged, thus ensuring no risk of electric shock during operation and ensuring absolute personnel safety.

[0040] In this embodiment, both the first optocoupler U3 and the second optocoupler U4 include phototransistors U3B and U4B and photodiodes U3A and U4A. When the photodiode is turned on, it emits light and triggers the corresponding phototransistor to turn on, at which point the corresponding optocoupler is turned on. The phototransistors U3B and U4B of the first optocoupler U3 and the second optocoupler U4 are connected in series via their collector and emitter terminals to the power supply pin VCC of the high-voltage power supply auxiliary module 30 (18V) and the power factor correction circuit control chip U1 and the LLC resonant half-bridge control chip U2, which are electrically connected to each other. Therefore, when both optocouplers U3 and U4 are conducting, the output voltage (18V) of the high-voltage power supply auxiliary module 30 is connected to the power supply pin VCC of the chips (i.e., the power factor correction circuit control chip U1 and the LLC resonant half-bridge control chip U2) of the power factor correction BOOST boost circuit 12 and the LLC resonant half-bridge circuit 13, causing the power factor correction BOOST boost circuit 12 and the LLC resonant half-bridge circuit 13 to switch to the operating state. If optocouplers U3 and U4 are not conducting, the power supply pin VCC is left floating, and the power factor correction BOOST boost circuit 12 and the LLC resonant half-bridge circuit 13 switch to the off state.

[0041] The reference voltage comparison circuit 41 includes a comparator and a switching transistor. The comparator compares the reference voltage Vref with the detection ground GND. If the voltage of the detection ground GND is higher than the reference voltage Vref, the comparator drives the switching transistor to conduct, causing the switching transistor to conduct to ground and drive the photodiode U3A of the first optocoupler U3 to conduct. The reference voltage comparison circuit 41 is preferably implemented using a TL431 reference chip, whose comparator and switching transistor can achieve the above functions. The detection ground GND is located at the negative terminal of the working device of the microcontroller control circuit 60 and the cooling circuit 70, and is connected to the signal ground (i.e., the triangle without GND in the figure) through the current sensing resistor RCS, so that the reference voltage comparison circuit 41 can detect whether the AC-DC low voltage power supply module 20 is connected to the hair removal device host according to the voltage of the detection ground GND. Therefore, after the hair removal device is connected to the power supply, the output voltage of the AC-DC low-voltage power supply module 20 (12V) supplies power to the continuity detection circuit 40, the microcontroller control circuit 60, and the cooling circuit 70, causing the microcontroller control circuit 60 and the cooling circuit 70 to work and generate a current of 0.8-1.5A. This generates a detection ground voltage (50mV) on the current detection resistor RCS when the low-voltage power supply module 20 is connected to the hair removal device. This detection ground voltage (50mV) is higher than the reference voltage Vref, causing the reference voltage comparison circuit 41 to drive the photodiode U3A of the first optocoupler U3 to conduct, which in turn causes the collector and emitter of the phototransistor U3B of the first optocoupler U3 to conduct. In other words, the entire first optocoupler U3 is conducted so that the output voltage (18V) of the high-voltage power supply auxiliary module 30 is connected to the power supply pin VCC of the power factor correction circuit control chip U1 and the LLC resonant half-bridge control chip U2, which are electrically connected to each other.

[0042] The microcontroller control circuit 60 includes a microcontroller chip U7, which is used for controlling the working mode of the hair removal device itself. Its specific working principle is consistent with existing technology. As with existing technology, the power supply pin VDD of the microcontroller chip U7 is connected to the output voltage (12V) of the AC-DC low-voltage power supply module 20 through a voltage regulator protection circuit 61. Its pin PA0 is connected to a light button switch circuit 62 with a light button switch, and its pin PA4 is used to trigger the lamp start switch in the illumination lamp circuit 80. After the lamp charging capacitor C0 is fully charged, when the user presses the illumination button switch, the microcontroller chip U7 sends a control command to control the illumination button switch to conduct, activating the illumination lamp circuit 80. The lamp charging capacitor C0 discharges to the illumination lamp, thus achieving illumination. The only difference between the microcontroller control circuit 60 and existing technology is that the microcontroller chip U7 has an activation output pin PB5 for continuously outputting an activation logic signal (i.e., a low level) for detection by the on / off detection circuit 40.

[0043] The rapid discharge circuit 50 is used to discharge the charge on the lamp charging capacitor C0 when the continuity detection circuit 40 detects that the source device and the hair removal device main unit are disconnected, so as to avoid danger when personnel come into contact with it. In this embodiment, the rapid discharge circuit 50 includes a discharge switch transistor M3 whose gate is connected to the activation output pin PB5 of the microcontroller control circuit 60. The drain of the discharge switch transistor M3 is connected to the high-voltage side of the lamp charging capacitor C0 and its source is grounded. The discharge switch transistor M3 is an NMOS transistor. Therefore, when the microcontroller control circuit 60 is in the working state (i.e., when it receives the activation logic signal), the discharge switch transistor M3 is turned off to maintain the charge on the lamp charging capacitor C0; when the microcontroller control circuit 60 ends its working state, it is turned on to discharge the charge on the lamp charging capacitor C0.

[0044] The working principle of the hair removal device assembly with pluggable host and power supply of the present invention is as follows: When AC mains power is supplied, the AC-DC high-voltage power supply module 10 is not working. Only the high-voltage power supply auxiliary module 30 and the AC-DC low-voltage power supply module 20 are working. The high-voltage power supply auxiliary module 30 generates 18V, and the AC-DC low-voltage power supply module 20 outputs an isolated 12V voltage. The AC-DC low-voltage power supply module 20 uses a flyback control chip U5 to provide an isolated 12V output voltage to power the continuity detection circuit 40, the microcontroller control circuit 60, and the cooling circuit 70.

[0045] The continuity detection circuit 40 detects the continuity between the power supply and the hair removal device main unit through a reference voltage comparison circuit 41 and a microcontroller activation judgment circuit 42. The reference voltage comparison circuit 41 detects whether the AC-DC low-voltage power supply module 20 is connected to the hair removal device main unit based on the detection ground GND of the negative terminal of the working device of the microcontroller control circuit 60 and the cooling circuit 70. Upon detecting that the AC-DC low-voltage power supply module 20 is connected to the hair removal device main unit, it controls the first optocoupler U3 to conduct. The microcontroller activation judgment circuit 42 is configured to detect the level of the activation output pin PB5 of the microcontroller control circuit 60 to drive the second optocoupler U4 to conduct when the microcontroller control circuit 60 is in working state. After the microcontroller chip U7 of the hair removal device main unit completes its power-on self-test, the activation output pin PB5 of the microcontroller chip U7 outputs an activation logic signal (i.e., a low level) to drive the second optocoupler U4 to conduct.

[0046] Only when the first optocoupler U3 and the second optocoupler U4 are simultaneously turned on can the output voltage 18V of the high-voltage power supply auxiliary module 30 supply power to the power supply pins VCC of chips U1 and U2 of the power factor correction BOOST boost circuit 12 and LLC resonant half-bridge circuit 13, so that the power factor correction BOOST boost circuit 12 and LLC resonant half-bridge circuit 13 switch to the working state. The power factor correction BOOST boost circuit 12 achieves high power factor and low THD, while boosting the voltage of the first power supply terminal Vbus to 450V. The LLC resonant half-bridge circuit 13 outputs 320V (instantaneous power of 400-600W) to charge the 1000-4000uF / 350V lamp charging capacitor C0 (full charge time is less than 100ms). After the lamp charging capacitor C0 is fully charged, the user presses the illumination button switch. The microcontroller chip U7 sends a control command to turn on the illumination button switch, activating the illumination lamp circuit 80. The lamp charging capacitor C0 then discharges to the illumination lamp, thus achieving illumination. The strong light is absorbed by the melanin in the hair follicles and converted into heat energy, thereby damaging the hair follicle structure and inhibiting hair regeneration.

[0047] When the power supply is disconnected from the hair removal device, but the power input is still connected to the AC mains, the continuity detection circuit 40 detects the disconnection and simultaneously disconnects the first optocoupler U3 and the second optocoupler U4, causing them to cease operation. Chips U1 and U2 in the AC-DC high-voltage power module 10 also stop working. Only the AC-DC low-voltage power module 20 operates normally. After the hair removal device is disconnected from the power supply, the lamp charging capacitor C0 still retains a residual 320V high voltage. At this time, the rapid discharge circuit 50 conducts, providing a rapid discharge channel for the residual charge in the lamp charging capacitor C0, reducing the voltage from 320V to a safe voltage below 36V within a few seconds. Based on the above principles, the power supply of this invention enables safe plugging and unplugging while ensuring that the interval between two light applications is less than 100ms.

[0048] The main unit and the pluggable hair removal device assembly of the present invention have the following advantages:

[0049] 1) The two main types of hair removal devices on the market previously had long activation times for two separate activation cycles, resulting in a poor user experience (for example, with the second type, pressing and releasing the activation button repeatedly would prevent the device from activating, requiring a noticeable waiting time, typically exceeding 1.5 seconds). The BOOST boost circuit and LLC resonant half-bridge circuit utilize high-power-capable circuitry. The two-stage architecture of the BOOST boost circuit and LLC resonant half-bridge circuit, with a 450V output voltage, allows the BOOST boost circuit to maintain power supply to the LLC resonant half-bridge circuit (320V) for a certain period when its output voltage is pulled down. Therefore, the hair removal device has higher power, capable of providing 400-600W of power instantaneously. Using the components of this invention, the hair removal device has even higher power, allowing users to activate the device at will (each press and release of the activation button typically exceeds 100ms), eliminating waiting time. The user can completely control the interval between activations; simultaneously, it effectively reduces the capacitance value of C0 required for the capacitor, allowing for simultaneous charging and discharging. For example, if the original 2200uF / 350V energy storage capacitor is replaced with this power supply, the capacitor value can be reduced by half (for IPL laser lamps with a discharge time of 10-20ms), thus making the hair removal device main unit more compact.

[0050] 2) When the continuity detection circuit of this invention detects that the power supply is not connected to the hair removal device main unit, the AC-DC high-voltage power supply module 10 does not work, ensuring that there is no high voltage on the lamp charging capacitor at this time. Only when the power supply is detected to be connected to the hair removal device main unit will the AC-DC high-voltage power supply module 10 be controlled to output 320V voltage to charge the lamp charging capacitor. Therefore, when using the hair removal device with this power supply, the user can unplug the power supply and the hair removal device, and the power supply and the hair removal device main unit can be stored separately, which is convenient for storage and retrieval.

[0051] 3) When the power supply is disconnected from the main unit of the hair removal device, the fast discharge circuit of the present invention provides a discharge channel for the charging capacitor of the lamp tube, so that the residual voltage is quickly reduced from 320V to a safe voltage below 36V, ensuring that there is no risk of electric shock if a person touches the power output plug.

[0052] In other embodiments, the first optocoupler U3 and the second optocoupler U4 can be replaced by other types of trigger-type switching devices such as relays, thyristors, and MOSFETs, as the first and second trigger-type switching devices.

[0053] Furthermore, in other embodiments, the positions of the first and second trigger-type switching devices can also be changed as needed.

[0054] For example, in another embodiment, the first and second trigger-type switches are connected in series at the voltage input terminal Vin1 of the LLC resonant half-bridge circuit 13, so that the voltage input terminal Vin1 is connected to the first power supply terminal Vbus through the first and second trigger-type switches. Thus, when the hair removal device is detected to be connected to the power supply, the first and second trigger-type switches at the voltage input terminal Vin1 of the LLC resonant half-bridge circuit 13 are turned on, causing the LLC resonant half-bridge circuit 13 to operate and output 320V. When the hair removal device is detected to be disconnected from the power supply, the first and second trigger-type switches are controlled to disconnect the input voltage of the LLC resonant half-bridge circuit 13, thereby causing the LLC resonant half-bridge circuit 13 to stop operating and use the output voltage to charge the lamp charging capacitor C0.

[0055] In another embodiment, the first and second trigger-type switching devices are connected in series at the voltage output terminal Vout1 of the LLC resonant half-bridge circuit 13, so that the voltage output terminal Vout1 is connected to the lamp charging capacitor C0 through the first and second trigger-type switching devices. Therefore, when the hair removal device is detected to be connected to the power supply, the first and second trigger-type switching devices are controlled to charge the lamp charging capacitor C0. When the hair removal device is detected to be disconnected from the power supply, the relay or MOS is controlled to stop working, thereby cutting off the 320V to the large electrolytic charging circuit.

[0056] In other words, the on / off detection circuit 40 may include a first trigger switch and a second trigger switch connected in series; if the power supply and the hair removal device are connected, both the first trigger switch and the second trigger switch are triggered to conduct so that the lamp charging capacitor C0 is charged to the lamp working voltage by the output voltage of the LLC resonant half-bridge circuit 13; otherwise, the lamp charging capacitor stops charging. In this scheme, the first and second trigger switches are connected in series between the output voltage of the high-voltage power supply auxiliary module and the power supply pins of the BOOST boost circuit and LLC resonant half-bridge circuit chip; or, the first and second trigger switches are connected in series between the voltage input terminal and the first power supply terminal of the LLC resonant half-bridge circuit; or, the first and second trigger switches are connected in series between the voltage output terminal and the lamp charging capacitor of the LLC resonant half-bridge circuit; or, the first and second trigger switches are connected in series between the rectifier bridge of the preliminary AC-DC conversion circuit and the power factor correction BOOST circuit; or, the first and second trigger switches are connected in series between the AC input terminal and the rectifier bridge of the preliminary AC-DC conversion circuit.

[0057] In another embodiment, the first and second trigger-type switching devices are disposed between the output voltage (18V) of the high-voltage power supply auxiliary module 30 and the power supply pin VCC of the power factor correction circuit control chip U1 and the LLC resonant half-bridge control chip U2, which are electrically connected to each other. The first and second trigger-type switching devices are connected in parallel, with one end grounded and the other end connected between the output voltage (18V) of the high-voltage power supply auxiliary module 30 and the power supply pin VCC. Thus, by short-circuiting the output voltage (18V) of the high-voltage power supply auxiliary module 30 to ground using the first and second trigger-type switching devices, the operation of the power factor correction BOOST boost circuit 12 and the LLC resonant half-bridge circuit 13 is controlled. After detecting the BOOST boost circuit 12 and LLC resonant half-bridge circuit 13 for power factor correction, the first and second trigger switches are turned off, causing the BOOST boost circuit 12 and LLC resonant half-bridge circuit 13 for power factor correction to be in working state; when the hair removal device host is detected to be disconnected from the power supply, the first and second trigger switches are turned on to short-circuit the output voltage (18V) of the VCC voltage high-voltage power supply auxiliary module 30, and the BOOST boost circuit 12 and LLC resonant half-bridge circuit 13 for power factor correction to stop working, thus failing to provide the output voltage 320V of the LLC resonant half-bridge control chip U2.

[0058] In other words, the continuity detection circuit includes a first trigger switch and a second trigger switch connected in parallel, with one end of each trigger switch grounded so that when the circuit is on, the voltage at the other end of the first trigger switch and the second trigger switch is pulled down to ground; if the power supply and the hair removal device are connected, both the first trigger switch and the second trigger switch are triggered to disconnect so that the lamp charging capacitor is charged to the lamp operating voltage by the output voltage of the LLC resonant half-bridge circuit; otherwise, the lamp charging capacitor stops charging.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Various variations can be made to the above embodiments of the present invention. All simple and equivalent changes and modifications made in accordance with the claims and description of this application fall within the protection scope of the claims of this patent. All aspects not described in detail in this invention are conventional technical content.

Claims

1. A hair removal device assembly with a detachable main unit and power supply, characterized in that, It includes an AC-DC high voltage power supply module, an AC-DC low voltage power supply module powered by the AC-DC high voltage power supply module, a high voltage power supply auxiliary module, and a lamp charging capacitor, a continuity detection circuit and a microcontroller control circuit powered by the AC-DC low voltage power supply module, and a lighting lamp circuit connected to the lamp charging capacitor. The AC-DC high-voltage power supply module, AC-DC low-voltage power supply module, high-voltage power supply auxiliary module, continuity detection circuit, and lamp charging capacitor are all integrated into a single power supply unit. The microcontroller control circuit and the lamp circuit are integrated into the hair removal device main unit, and the power supply unit and the hair removal device main unit are pluggable. The continuity detection circuit is used to detect the continuity between the power supply unit and the hair removal device main unit. When the power supply unit and the hair removal device main unit are connected, the lamp charging capacitor is charged to the lamp operating voltage.

2. The hair removal device assembly with a detachable host and power supply according to claim 1, characterized in that, The AC-DC high-voltage power supply module includes a preliminary AC-DC conversion circuit, a power factor correction BOOST boost circuit and an LLC resonant half-bridge circuit that can be switched between an operating state and a shutdown state. The common voltage output terminal of the preliminary AC-DC conversion circuit and the power factor correction BOOST boost circuit serves as the first power supply terminal. The voltage input terminal of the LLC resonant half-bridge circuit is connected to the first power supply terminal and the output terminal is connected to the lamp charging capacitor. Both the AC-DC low-voltage power supply module and the high-voltage power supply auxiliary module are connected to the first power supply terminal.

3. The hair removal device assembly with a detachable host and power supply according to claim 2, characterized in that, The on / off detection circuit includes a reference voltage comparison circuit and a microcontroller activation judgment circuit. The reference voltage comparison circuit is configured to detect the detection ground voltage of the negative terminal of the working device of the microcontroller control circuit and the cooling circuit, and when the detection ground voltage exceeds the reference voltage, it determines that the detection AC-DC low voltage power supply module is connected to the hair removal device host and triggers the first trigger-type switching device. The microcontroller activation judgment circuit is configured to detect the level of the activation output pin of the microcontroller control circuit, so as to output an activation logic signal to trigger the second trigger-type switching device when the microcontroller control circuit is in the working state.

4. The hair removal device assembly with a detachable host and power supply according to claim 3, characterized in that, The continuity detection circuit includes a first trigger switch and a second trigger switch connected in series. If the power supply and the hair removal device are connected, both the first trigger switch and the second trigger switch are triggered to conduct, so that the lamp charging capacitor is charged to the lamp operating voltage by the output voltage of the LLC resonant half-bridge circuit; otherwise, the lamp charging capacitor stops charging.

5. The hair removal device assembly with a detachable host and power supply according to claim 4, characterized in that, The first and second trigger-type switching devices are connected in series between the output voltage of the high-voltage power supply auxiliary module and the power supply pins of the BOOST boost circuit and LLC resonant half-bridge circuit chip for power factor correction. Alternatively, the first and second trigger-type switching devices are connected in series between the voltage input terminal and the first power supply terminal of the LLC resonant half-bridge circuit; the first trigger-type switching device and the second trigger-type switching device; Alternatively, the first and second trigger-type switching devices are connected in series between the voltage output terminal of the LLC resonant half-bridge circuit and the lamp charging capacitor. Alternatively, the first and second trigger switching devices are connected in series between the rectifier bridge and the power factor correction BOOST circuit of the initial AC-DC conversion circuit; Alternatively, the first and second trigger switches are connected in series between the AC input terminal and the rectifier bridge of the preliminary AC-DC conversion circuit.

6. The hair removal device assembly with a detachable host and power supply according to claim 3, characterized in that, The continuity detection circuit includes a first trigger switch and a second trigger switch connected in parallel, with one end of each trigger switch grounded so that when the circuit is on, the voltage at the other end of the first trigger switch and the second trigger switch is pulled down to ground. If the power supply and the hair removal device are connected, both the first trigger switch and the second trigger switch are triggered to disconnect so that the lamp charging capacitor is charged to the lamp operating voltage by the output voltage of the LLC resonant half-bridge circuit. Otherwise, the lamp charging capacitor stops charging.

7. The hair removal device assembly with a detachable main unit and power supply according to claim 6, characterized in that, One end of the first and second trigger-type switching devices is grounded, and the other end is connected between the output voltage of the high-voltage power supply auxiliary module and the power supply pin of the LLC resonant half-bridge circuit chip.

8. The hair removal device assembly with a detachable main unit and power supply according to claim 4 or 6, characterized in that, The first and second trigger-type switching devices include at least one of optocouplers, relays, thyristors, and MOSFETs.

9. The hair removal device assembly with a detachable main unit and power supply according to claim 1, characterized in that, The AC-DC low-voltage power supply module is an isolated power circuit module powered by the first power supply terminal Vbus, which adopts a flyback switching power supply; the high-voltage power supply auxiliary module is a non-isolated power circuit module powered by the first power supply terminal Vbus, which adopts a BUCK circuit module.

10. The hair removal device assembly with a detachable host and power supply according to claim 1, characterized in that, The power supply unit integrates a fast discharge circuit connected to the lamp charging capacitor. When the power supply unit and the hair removal device main unit are disconnected, the fast discharge circuit discharges the charge on the lamp charging capacitor. Furthermore, the hair removal device's main unit integrates a cooling circuit powered by an AC-DC low-voltage power supply module.

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