Current control circuit of skin care equipment and skin care equipment

Abstract

The utility model discloses a current control circuit of skin care equipment, and the current control circuit of the skin care equipment realizes the output of currents with different frequencies to an electrode assembly through the cooperation of a power supply circuit, a drive circuit and a transformer. The power supply circuit provides electric energy for the system, the drive circuit generates and switches drive signals, the transformer generates current with corresponding frequency according to the drive signals, and finally the current acts on the skin through the electrode assembly, so that the skin care effect is achieved. Through cooperation of the power supply circuit, the driving circuit and the transformer, the skin care equipment can work in different frequency modes, and different skin care requirements are met. Besides, the current of the first frequency and the current of the second frequency share the same current generation circuit to generate the current and share the electrode assembly to output the currents of different frequencies in a time-sharing mode, various skin care effects are achieved, the cost of the current control circuit is reduced, and the skin care equipment is more economical and economical.

Description

Technical Field

[0001] The utility model relates to the field of skin care equipment, in particular to a current control circuit of skin care equipment and skin care equipment. Background Art

[0002] A skin care device is a device used to care for the skin.

[0003] The related art provides a skin care device that cares for the skin by outputting two currents of different frequencies to the skin. The two currents of different frequencies are generated by two different current generating circuits and output by different electrodes, that is, the currents of different frequencies use different hardware circuits, and the electrodes are not shared.

[0004] The above-mentioned skin care device has the following shortcomings in specific applications: currents of different frequencies do not share the current generating circuit and electrode output, which not only increases the hardware cost, but also increases the complexity and volume of the skin care device. Utility Model Content

[0005] The first aspect of the present invention aims to provide a skin care device, which aims to solve the technical problem of high cost of current control circuit in the related art.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the first aspect of the present invention is:

[0007] An electrode assembly, the electrode assembly being used to output current to the skin;

[0008] a current generating circuit, the current generating circuit being electrically connected to the electrode assembly and configured to output a current of a first frequency and a current of a second frequency to the electrode assembly;

[0009] Wherein, the current generating circuit comprises:

[0010] A transformer, wherein an output end of the transformer is electrically connected to the electrode assembly;

[0011] A power circuit, the power circuit being electrically connected to a power input terminal of the transformer to supply power to the transformer;

[0012] a driving circuit, the driving circuit being electrically connected to a signal input terminal of the transformer, and being used for providing the transformer with a driving signal of the first frequency and a driving signal of the second frequency, so as to drive the transformer to output a current of the first frequency and a current of the second frequency to the electrode assembly;

[0013] The first frequency is less than or greater than the second frequency.

[0014] In some embodiments, the first frequency is greater than or equal to 70 kHz and less than or equal to 100 kHz;

[0015] And / or, the second frequency is greater than or equal to 150 kHz and less than or equal to 300 kHz.

[0016] In some embodiments, the current generating circuit further comprises:

[0017] An output control circuit is connected between the signal input terminal of the transformer and the drive circuit to control the output of the transformer.

[0018] In some embodiments, the transformer has two signal input terminals;

[0019] The output control circuits include two, one of which is connected between one of the signal input terminals of the transformer and the drive circuit, and the other of which is connected between the other signal input terminal of the transformer and the drive circuit.

[0020] In some embodiments, the output control circuit includes:

[0021] A switch control unit, one end of which is connected to the signal input end of the transformer;

[0022] An adjustment unit is connected between the driving circuit and the switch control unit to adjust a conduction speed of the switch control unit.

[0023] In some embodiments, the adjustment unit includes a rising edge control circuit and a falling edge control circuit, and the rising edge control circuit and the falling edge control circuit are connected in parallel between the driving circuit and the switch control unit;

[0024] The rising edge control circuit includes a first resistor, the falling edge control circuit includes a first diode, an anode of the first diode is connected to the switch control unit, and a cathode of the first diode is connected to the drive circuit.

[0025] In some embodiments, the falling edge control circuit further includes a second resistor, wherein the second resistor is connected between the anode of the first diode and the switch control unit, or the second resistor is connected between the cathode of the first diode and the drive circuit;

[0026] And / or, the rising edge control circuit also includes a second diode, the anode of the second diode is connected to the drive circuit, and the first resistor is connected between the cathode of the second diode and the switch control unit; or, the cathode of the second diode is connected to the switch control unit, and the first resistor is connected between the anode of the second diode and the drive circuit.

[0027] In some embodiments, the switch control unit is a MOS tube, the gate of the switch control unit is electrically connected to the adjustment unit, the drain of the switch control unit is electrically connected to the signal input end of the transformer, and the source of the switch control unit is grounded.

[0028] In some embodiments, the electrode assembly includes at least two electrodes, and the output end of the transformer is connected to the at least two electrodes.

[0029] The second aspect of the present invention aims to provide a skin care device, the skin care device comprising:

[0030] A shell, one end of which is formed with a beauty head;

[0031] As in the current control circuit of the aforementioned skin care device, the electrode assembly is at least partially exposed outside the beauty head to output current to the skin.

[0032] In the technical solution of this embodiment, the current control circuit of the skin care device realizes the output of currents of different frequencies to the electrode assembly through the cooperation of the power supply circuit, the drive circuit and the transformer. The power supply circuit provides electrical energy to the system, the drive circuit generates and switches the drive signal, and the transformer generates a current of the corresponding frequency according to the drive signal, and finally acts on the skin through the electrode assembly to achieve the effect of skin care. Through the cooperation of the power supply circuit, the drive circuit and the transformer, the skin care device can operate in different frequency modes to meet different skin care needs. In addition, the current of the first frequency and the current of the second frequency share the same current generating circuit to generate current, and share the electrode assembly to output currents of different frequencies in time, which not only achieves a variety of skin care effects, but also reduces the cost of the current control circuit, making the skin care device more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0034] Figure 1 It shows a schematic diagram of electrical connection of a current control circuit module of a skin care device in one embodiment of the utility model;

[0035] Figure 2 It shows a schematic diagram of electrical connection of a current control circuit module of a skin care device in one embodiment of the utility model;

[0036] Figure 3 It shows a schematic diagram of electrical connection of a current control circuit module of a skin care device in one embodiment of the utility model;

[0037] Figure 4 A schematic diagram of electrical connection of a current control circuit module of a skin care device in another embodiment of the utility model is shown.

[0038] Description of Figure Numbers:

[0039] 100, electrode assembly; 200, current generating circuit; 210, output control circuit; 220, transformer; 220a, signal input terminal; 220b, output terminal of transformer; 220c, power input terminal of transformer

[0040] 230, power supply circuit; 240, drive circuit; 250, switch control unit; 260, adjustment unit; 262, rising edge control circuit; R1, first resistor; D2, second diode; 264, falling edge control circuit; D1, first diode; R2, second resistor. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] The skin care device provided in this embodiment is mainly used for skin care, where the skin care can be cosmetic or therapeutic. The skin can be the skin of a human body or the skin of an animal. The skin of a human body can be the skin of the face, the skin of the hands, the skin of the legs, the skin of the abdomen, or the skin of other parts of the human body.

[0043] See also Figure 1 , Figure 1 A schematic diagram of electrical connection of a current control circuit module of a skin care device in one embodiment of the utility model is shown.

[0044] The current control circuit of the skin care device provided in the embodiment of the utility model comprises:

[0045] The electrode assembly 100 is used to output current to the skin;

[0046] A current generating circuit 200, the current generating circuit 200 is electrically connected to the electrode assembly 100, and is used to output a current of a first frequency and a current of a second frequency to the electrode assembly 100;

[0047] The current generating circuit 200 includes:

[0048] A transformer 220, wherein an output end 220b of the transformer is electrically connected to the electrode assembly 100;

[0049] A power circuit 230, the power circuit 230 is electrically connected to the power input terminal 220c of the transformer to supply power to the transformer 220;

[0050] A driving circuit 240, the driving circuit 240 is electrically connected to the signal input terminal 220a of the transformer, and is used to provide a driving signal of a first frequency and a driving signal of a second frequency to the transformer 220, so as to drive the transformer to output a current of the first frequency and a current of the second frequency to the electrode assembly 100;

[0051] The first frequency is less than or greater than the second frequency.

[0052] In the present embodiment, the electrode assembly 100 is mainly used as the part in direct contact with the skin, and the electrode assembly 100 is responsible for safely and effectively transferring the current to the skin surface. It can adopt an electrode pad or an electrode pen made of medical grade materials to ensure comfort and biocompatibility. For example, silver / silver chloride (Ag / AgCl), which is a commonly used bioelectrode material, is widely used because of its good conductivity and stable electrochemical properties. Silver / silver chloride electrodes are very effective for recording potentials in diagnostic tools such as electrocardiograms (ECG), electroencephalograms (EEG) and electromyograms (EMG). Of course, not limited to this, the material of the electrode assembly 100 can also be tungsten, platinum and other materials.

[0053] The current generating circuit 200 in this embodiment is the core component of this embodiment, which is mainly responsible for generating a current of a specific frequency. Exemplarily, the current generating circuit 200 can use an integrated PWM controller and a power amplifier as control to generate precise first frequency and second frequency currents. For example, the current generating circuit 200 in this embodiment includes a transformer 220, a power supply circuit 230 and a drive circuit 240, wherein:

[0054] The transformer 220 is mainly used to boost the power supply, for example, it uses the magnetic coupling between the primary coil and the secondary coil to transmit and convert electrical energy. When the current passes through the primary coil, it will generate a changing magnetic flux on the magnetic core, and this changing magnetic flux will induce a voltage in the secondary coil, thereby realizing the transmission and conversion of electrical energy.

[0055] It should be understood that the primary coil receives the electric energy from the power circuit 230 and generates a magnetic field, while the secondary coil induces a voltage from the magnetic field of the primary coil. At this time, the electrode assembly 100 connected to the secondary coil generates current as a load to complete the energy transfer. At the same time, under the two frequency drive of the driving circuit 240, the output frequency of the transformer changes accordingly to meet different beauty needs.

[0056] It can be understood that, in this embodiment, only two frequencies are used as examples. Of course, in other embodiments, multiple frequencies can be used to control the transformer to output currents of corresponding frequencies.

[0057] The power supply circuit 230 in this embodiment provides a stable power supply for the transformer 220 and the electrode assembly 100. It can adopt a switching power supply module to provide a high-efficiency and stable power supply. It is understandable that the power supply circuit 230 can also be used to power the drive circuit 240, and of course the drive circuit 240 can also be powered by an independent power supply circuit.

[0058] The driving circuit 240 in this embodiment is mainly used to control the working state of the transformer 220 and provide driving signals of the first frequency and the second frequency. The driving circuit 240 in this embodiment can be implemented by a dual-channel driver, for example, a half-bridge driver (IR2101 / IR2104), which is suitable for driving a push-pull or half-bridge MOS tube. Another example is a high-performance half-bridge driver (LM5109B), which has high noise immunity and high switching speed.

[0059] During operation of the current control circuit of the skin care device in this embodiment, the power circuit 230 is connected to the power input terminal 220c of the transformer, and is responsible for providing necessary power to the transformer 220. The power circuit 230 can be a DC power supply or an AC power supply, which provides stable voltage and current after rectification and filtering.

[0060] The drive circuit 240 is connected to the signal input terminal 220a of the transformer and is responsible for generating drive signals. These drive signals include a drive signal of a first frequency and a drive signal of a second frequency. The drive circuit 240 may include or be electrically connected to a frequency generator or a PWM controller for generating a signal of a desired frequency.

[0061] These driving signals can adjust the switching frequency of the MOS tube, and the switching frequency of the MOS tube directly determines the frequency of the transformer output current. Specifically, the driving signal of the first frequency and the driving signal of the second frequency control the switching frequency of the MOS tube, so that the conduction or shutdown of the MOS tube controls the current conduction and shutdown in the primary winding of the transformer 220. This current change generates an alternating electromagnetic field in the primary winding of the transformer 220. The secondary winding of the transformer 220 senses this alternating electromagnetic field and converts it into corresponding currents of the first frequency and the second frequency. This current is transmitted to the electrode assembly 100 through the output terminal 220b of the transformer.

[0062] The electrode assembly 100 is electrically connected to the secondary winding of the transformer and receives the current input by the transformer 220. According to the driving signal provided by the driving circuit 240, the electrode assembly 100 can output the current of the first frequency or the current of the second frequency. In this way, through the frequency adjustment of the current generating circuit 200, the skin care device can work in different frequency modes to meet different skin care needs.

[0063] Furthermore, during the frequency switching and control process, the drive circuit 240 can switch the frequency of the drive signal according to a preset program or user input. In some applications, the first frequency may be used to promote blood circulation, while the second frequency may be used for deep skin stimulation and care. The selection and switching of the frequency can be achieved by a logic circuit or a microcontroller in the control circuit.

[0064] In the technical solution of the utility model, the current control circuit of the skin care device realizes the output of currents of different frequencies to the electrode assembly 100 through the cooperation of the power supply circuit 230, the drive circuit 240 and the transformer 220. The power supply circuit 230 provides electrical energy to the system, the drive circuit 240 generates and switches the drive signal, and the transformer 220 generates a current of the corresponding frequency according to the drive signal, and finally acts on the skin through the electrode assembly 100 to achieve the effect of skin care. Through the cooperation of the power supply circuit 230, the drive circuit 240 and the transformer 220, the skin care device can work in different frequency modes to meet different skin care needs. In addition, the current of the first frequency and the current of the second frequency share the same current generating circuit to generate current, and share the electrode assembly 100 to output currents of different frequencies in time, which not only achieves a variety of skin care effects, but also reduces the cost of the current control circuit, making the skin care device more economical.

[0065] In one implementation, the driving circuit 240 may include an MCU chip and a driver chip, and the driver chip is connected between the MCU chip and the output control circuit 210 .

[0066] In this embodiment, the microcontroller unit (MCU) chip is a single-chip microcomputer that integrates a processor, memory, and input / output peripherals. It is responsible for generating control signals, executing programs, and processing user inputs. The driver chip is specifically used to amplify and transmit the control signal generated by the MCU to ensure that the signal strength and level are suitable for driving the components (such as MOS tubes) of the output control circuit 210.

[0067] MCU chips have powerful processing capabilities and programming flexibility, and can implement complex control algorithms and precise time control to generate high-precision PWM signals. Driver chips can amplify the low-voltage control signal of the MCU to a level suitable for driving MOS tubes. If the MCU output is used directly to drive the MOS tube, insufficient current may cause incomplete or delayed switching, affecting circuit performance.

[0068] In this embodiment, the driver chip usually integrates protection functions such as short circuit protection, overcurrent protection and overheat protection, which enhances the reliability and safety of the system. In this embodiment, the signal amplification task is assigned to the driver chip, which can reduce the load of the MCU and improve the stability and efficiency of the system.

[0069] Further, the first frequency is greater than or equal to 70 kHz and less than or equal to 100 kHz;

[0070] And / or, the second frequency is greater than or equal to 150 kHz and less than or equal to 300 kHz.

[0071] The first frequency is set to be greater than or equal to 70kHz and less than or equal to 100kHz because this frequency range is suitable for promoting blood circulation and surface skin care. The current of the first frequency can gently stimulate the skin, promote blood flow, and improve the metabolism and nutrition supply of the skin.

[0072] The second frequency is greater than or equal to 150kHz and less than or equal to 300kHz, which is suitable for deep skin care. The higher frequency current can penetrate the surface of the skin and act on the deeper layers of the skin, stimulating the production of collagen and improving the elasticity and firmness of the skin.

[0073] In this embodiment, by selecting reasonable first frequency current and second frequency current, adopting a common circuit and a common electrode head design for the first frequency current and the second frequency current, and controlling the output of the first frequency current and the second frequency current through software time-sharing, the system design is more economical and can provide a variety of skin care effects.

[0074] See also Figure 2 , Figure 2 A schematic diagram of electrical connection of a current control circuit module of a skin care device in one embodiment of the utility model is shown.

[0075] In this embodiment, the current generating circuit 200 further includes:

[0076] The output control circuit 210 is connected between the signal input terminal 220a of the transformer and the driving circuit 240 to control the output of the transformer.

[0077] In this embodiment, the output control circuit 210 plays a key role in the current control circuit of the skin care device. Under the driving signal of the driving circuit 240, it enables the transformer to output current of the correct frequency to achieve precise control of the frequency of the output current to meet the needs of different skin care modes.

[0078] The output control circuit 210 can be implemented by a variety of devices, such as MOSFET or IGBT, which are suitable for controlling large currents and high voltages. MOSFET is suitable for high-frequency applications, and IGBT is suitable for high-voltage and medium-frequency applications. For another example, some typical devices can be used, such as IRF540, IRLZ44N (MOSFET), IGBT, etc.

[0079] In this embodiment, the output control circuit 210 is connected between the signal input terminal 220a of the transformer and the driving circuit 240, and is responsible for controlling and adjusting the output frequency of the transformer under the driving signal of the driving circuit 240. The output control circuit 210 may include a switch, a voltage regulator or a filter to ensure the stability and accuracy of the signal, thereby accurately controlling the output of the transformer.

[0080] See also Figure 3 , Figure 3 A schematic diagram of electrical connection of a current control circuit module of a skin care device in one embodiment of the utility model is shown.

[0081] In this embodiment, the transformer has two signal input terminals 220a;

[0082] The output control circuits 210 include two output control circuits 210 , one of which is connected between a signal input terminal 220 a of the transformer and the driving circuit 240 , and the other of which is connected between another signal input terminal 220 a of the transformer and the driving circuit 240 .

[0083] In this embodiment, the driving circuit 240 generates driving signals of the first frequency and the second frequency according to a preset program or user input. The two output control circuits 210 are driven to work in a time-sharing manner, and the two output control circuits 210 control the transformer output frequency through the two signal input terminals 220a of the transformer;

[0084] Specifically, the drive circuit 240 can use control logic or a microcontroller to implement time-sharing alternating control of the two output control circuits 210. In a predetermined time period, the first frequency drive signal drives the two output control circuits 210 to work alternately, thereby driving the signal input terminal 220a of the transformer, so that the transformer outputs a current of a first frequency (greater than or equal to 70kHz and less than or equal to 100kHz). In another time period, the second frequency drive signal drives the two output control circuits 210 to work alternately, thereby controlling the transformer to output a current of a second frequency (greater than or equal to 150kHz and less than or equal to 300kHz).

[0085] At this time, the two primary windings of the transformer receive driving signals from the two output control circuits 210 respectively and generate an alternating electromagnetic field. The secondary winding of the transformer senses the alternating electromagnetic field and converts it into a current of a corresponding frequency, which is transmitted to the electrode assembly 100 through the output terminal 220b of the transformer.

[0086] In this embodiment, through this time-sharing alternating control, the output of the first frequency current and the second frequency current can be achieved on the same transformer and electrode assembly 100, making the system design more economical and saving, while being able to provide a variety of skin care effects.

[0087] Continue reading Figure 3 In this embodiment, the output control circuit 210 includes:

[0088] A switch control unit 250, one end of the switch control unit 250 is connected to the signal input end 220a of the transformer;

[0089] The adjustment unit 260 is connected between the driving circuit 240 and the switch control unit 250 to adjust the conduction speed of the switch control unit 250 .

[0090] In this embodiment, one end of the switch control unit 250 is connected to the signal input terminal 220a of the transformer, and the other end is connected to the adjustment unit 260. The switch control unit 250 is mainly used to switch on and off under the control of the drive signal, thereby controlling the output current of the transformer. Among them, the switch control unit 250 can be implemented by some devices, such as MOSFET, IGBT or relay. Among them, MOSFET and IGBT are suitable for the second frequency current application, and the relay is suitable for the second frequency current application.

[0091] The adjustment unit 260 is connected between the driving circuit 240 and the switch control unit 250, and is used to adjust the conduction speed of the switch control unit 250. By adjusting the conduction speed, the switch performance can be optimized, and the power consumption and electromagnetic interference can be reduced. The devices that can be used include operational amplifiers, RC networks, variable resistors, capacitors, etc., which are not particularly limited here.

[0092] In this embodiment, the addition of the adjustment unit 260 can adjust the rising edge of the signal. Specifically, when the driving signal passes through the adjustment unit 260, the voltage rises at a rate of the time constant, so that the slope of the rising edge of the signal can be controlled.

[0093] Furthermore, the slope of the rising edge can be precisely adjusted by changing the value of the adjustment unit 260, thereby controlling the conduction speed of the switch control unit 250. For example, a larger resistance value will make the rising edge slower and the conduction speed slower; a smaller resistance value will make the rising edge steeper and the conduction speed faster.

[0094] In this embodiment, the driving signal is first transmitted to the adjustment unit 260. The adjustment unit 260 adjusts the characteristics of the signal according to preset adjustment parameters (such as resistance and capacitance values), mainly adjusting the conduction speed and time constant of the signal to optimize the efficiency and stability of signal transmission.

[0095] The adjusted signal is transmitted to the switch control unit 250. The switch control unit 250 decides to turn on or off according to the output signal of the adjustment unit 260. When the switch control unit 250 is turned on, the current of the power supply circuit 230 passes through the signal input terminal 220a of the transformer (primary winding), so that the transformer outputs a current of the corresponding frequency (secondary winding). When the switch control unit 250 is turned off, the drive signal is cut off and the transformer stops outputting current.

[0096] In the process of time-sharing alternating control, the time-sharing alternating control of the two output control circuits 210 can be realized by control logic or microcontroller (drive circuit 240). In a predetermined time period, the two output control circuits 210 are activated alternately (including their switch control units 250 and adjustment units 260) to control the transformer to output a current of a first frequency. In another time period, the two output control circuits 210 are activated alternately to control the transformer to output a current of a second frequency. In this way, the time-sharing alternating output of the current of the first frequency and the current of the second frequency is realized.

[0097] Continue reading Figure 3 In this embodiment, the adjustment unit 260 includes a rising edge control circuit 262 and a falling edge control circuit 264, and the rising edge control circuit 262 and the falling edge control circuit 264 are connected in parallel between the driving circuit 240 and the switch control unit 250;

[0098] The rising edge control circuit 262 includes a first resistor R1 , and the falling edge control circuit 264 includes a first diode D1 . The anode of the first diode D1 is connected to the switch control unit 250 , and the cathode of the first diode D1 is connected to the drive circuit 240 .

[0099] In this embodiment, the rising edge control circuit 262 includes a first resistor R1 connected between the driving circuit 240 and the switch control unit 250. When the voltage of the driving signal rises from a low level to a high level, the current passes through the first resistor R1. This process adjusts the rising speed of the signal through the impedance of the resistor.

[0100] The larger the resistance of the first resistor R1 is, the slower the rising edge is, and vice versa. By adjusting the resistance of the first resistor R1, the slope of the rising edge of the signal can be controlled, thereby adjusting the conduction speed of the switch control unit 250.

[0101] The falling edge control circuit 264 includes a first diode D1, the anode of the diode is connected to the switch control unit 250, and the cathode is connected to the drive circuit 240. When the voltage of the drive signal drops from a high level to a low level, the current passes through the first diode D1. The presence of the first diode D1 ensures that the signal can be quickly transmitted at the falling edge, because the resistance of the diode in the on state is very small, and the transmission of the signal is almost not delayed. Therefore, the falling edge control circuit 264 enables the signal to drop quickly, reducing the closing time of the switch control unit 250.

[0102] In this implementation, taking the switch control unit 250 as a MOS tube as an example, the rising edge control circuit 262 and the falling edge control circuit 264 can adjust the peak signal and signal oscillation at the DS end. Specifically, in the switch control unit 250, the signal changes at the D (drain) and S (source) ends of the MOSFET are controlled by the driving signal.

[0103] The rising edge of the driving signal becomes slow due to the action of the rising edge control circuit 262 (first resistor R1), and this slow change reduces the sudden change of current, thereby reducing the peak voltage caused by the inductance effect.

[0104] The falling edge control circuit 264 (first diode D1) ensures that the signal changes quickly when falling, which reduces the switching time and the transition time of the MOSFET at the moment of cutoff, thereby reducing oscillation and spike voltage. Through different control of the rising edge and the falling edge, the spike signal and signal oscillation at the DS end can be effectively reduced, thereby improving the stability and reliability of the circuit.

[0105] See also Figure 4 , Figure 4A schematic diagram of electrical connection of a current control circuit module of a skin care device in another embodiment of the utility model is shown.

[0106] In this embodiment, the falling edge control circuit 264 further includes a second resistor R2, and the second resistor R2 is connected between the anode of the first diode D1 and the switch control unit 250, or the second resistor R2 is connected between the cathode of the first diode D1 and the drive circuit 240;

[0107] And / or, the rising edge control circuit 262 also includes a second diode D2, the anode of the second diode D2 is connected to the drive circuit 240, and the first resistor R1 is connected between the cathode of the second diode D2 and the switch control unit 250; or, the cathode of the second diode D2 is connected to the switch control unit 250, and the first resistor R1 is connected between the anode of the second diode D2 and the drive circuit 240.

[0108] In this embodiment, when the voltage of the driving signal rises from a low level to a high level, the level signal passes through the second diode D2 and the first resistor R1. The first resistor R1 adjusts the rising speed of the signal, and the second diode D2 ensures that the signal rises and passes, thereby effectively controlling the rising edge of the signal. By increasing the resistance value, the rising edge of the signal becomes slower, reducing the sudden change of the current, thereby reducing the DS spike voltage (the drain and source of the MOS tube) caused by the inductance effect.

[0109] The falling edge control circuit 264 includes a second resistor R2 and a first diode D1. The anode of the first diode D1 is connected to the switch control unit 250, and the cathode is connected to the drive circuit 240. The second resistor R2 can be connected between the anode of the first diode D1 and the switch control unit 250, or between the cathode of the first diode D1 and the drive circuit 240. When the drive signal drops from a high level to a low level, the level signal passes through the second resistor R2 and the first diode D1. The existence of the second resistor R2 adjusts the falling speed of the signal, and controls the falling slope of the signal by introducing appropriate impedance to avoid oscillation and spikes caused by too fast voltage changes. The function of the second resistor R2 is to further smooth the falling process of the signal and reduce electromagnetic interference and switching noise.

[0110] See also Figure 3 and Figure 4 In this embodiment, the switch control unit 250 is a MOS tube, the gate of the switch control unit 250 is electrically connected to the adjustment unit 260, the drain of the switch control unit 250 is electrically connected to the signal input terminal 220a of the transformer, and the source of the switch control unit 250 is grounded.

[0111] In this embodiment, the switch control unit 250 is a MOS transistor, specifically an N-channel MOS transistor. The reason why the N-channel MOS transistor is used is that it has a lower on-resistance and a higher switching speed. In this circuit, the gate (G) of the N-channel MOS transistor is electrically connected to the drive circuit 240, the drain (D) is electrically connected to the signal input terminal 220a of the transformer, and the source (S) is grounded.

[0112] In this embodiment, the control signal generated by the driving circuit 240 is transmitted to the gate of the N-channel MOS transistor through the adjustment unit 260 .

[0113] When the driving signal is at a high level, the N-channel MOS transistor is turned on, and a low impedance path is formed between the drain and the source. At this time, the power supply of the power supply circuit 230 can flow to the negative electrode through the primary winding and the N-channel MOS transistor in sequence, and an alternating electromagnetic field will be generated in the primary winding during this process. The secondary winding of the transformer 220 will sense this alternating electromagnetic field and convert it into a corresponding current of the first frequency and a current of the second frequency. This current is transmitted to the electrode assembly 100 through the output terminal 220b of the transformer. When the driving signal is at a low level, the N-channel MOS transistor is turned off, and the impedance between the drain and the source is extremely high, preventing the current from passing, thereby cutting off the primary winding current of the transformer.

[0114] By controlling the on and off of the N-channel MOS tube, the driving circuit 240 can accurately control the input signal of the transformer, thereby achieving control of the transformer outputting the current of the first frequency and the current of the second frequency.

[0115] In this embodiment, the driving circuit 240 generates PWM signals of different frequencies, and the adjustment unit 260 adjusts the rising edge and the falling edge of the signal to accurately control the on and off of the N-channel MOS tube.

[0116] The coordinated use of the rising edge control circuit 262 (including the first resistor R1 and the second diode D2) and the falling edge control circuit 264 (including the second resistor R2 and the first diode D1) further optimizes the switching performance of the MOS tube, reduces spikes and oscillations during the switching process, and improves the stability and efficiency of the system.

[0117] When the control signal generated by the driving circuit 240 is of the first frequency, the N-channel MOS transistor is turned on and off at the first frequency, and the transformer outputs a first frequency current (70 kHz to 100 kHz).

[0118] When the control signal generated by the driving circuit 240 is of the second frequency, the N-channel MOS transistor is turned on and off at the second frequency, and the transformer outputs a current of the second frequency (150 kHz to 300 kHz).

[0119] Through time-sharing alternating control, flexible switching between the first frequency current and the second frequency current is achieved in the same current control circuit to meet different skin care needs.

[0120] By using an N-channel MOS transistor as the switch control unit 250, combined with the rising edge and falling edge control circuit 264 of the adjustment unit 260, efficient current control and stable output are ensured. The rising edge and falling edge control circuit 264 of the adjustment unit 260 further optimizes the switching performance of the MOS transistor, reduces spikes and oscillations, and improves the precise control capability of the circuit.

[0121] See also Figure 3 and Figure 4 In this embodiment, the electrode assembly 100 includes at least two electrodes, and the output end 220b of the transformer is connected to at least two of the electrodes.

[0122] In this embodiment, the electrode assembly 100 includes a plurality of electrodes for contacting the skin and outputting current. As for the number of electrodes, at least two electrodes may be connected to the output end 220b of the transformer, and the current generated by the transformer is transmitted to the skin through these electrodes. The use of multiple electrodes can provide a more comprehensive and uniform current distribution, cover a larger skin surface area, and enhance the care effect.

[0123] These electrodes can be of different shapes and sizes to meet the skin care needs of different parts. For example, the electrodes can be designed to be round, square, strip, etc.

[0124] During operation, the output terminal 220b of the transformer is connected to at least two electrodes. When the transformer outputs current, the current is transmitted to the skin through the electrodes. In different working modes, the drive circuit 240 controls the on and off frequency of the N-channel MOS tube, thereby adjusting the current frequency output by the transformer.

[0125] The rising edge control circuit 262 (including the first resistor R1 and the second diode D2) and the falling edge control circuit 264 (including the second resistor R2 and the first diode D1) optimize the switching performance of the MOS tube, reduce the peak and oscillation, and ensure the stable output of the current. The electrode assembly 100 transmits the first frequency current and the second frequency current output by the transformer to the skin to achieve different care effects.

[0126] The utility model further proposes a skin care device, comprising a housing and the above-mentioned current control circuit. The specific structure of the current control circuit refers to the above-mentioned embodiment. Since the skin care device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the technical effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. A beauty head is formed at one end of the housing, and the electrode assembly 100 is at least partially exposed outside the beauty head for outputting current to the skin.

[0127] The skin care device in this embodiment integrates the current control circuit in a compact housing, ensuring the portability and ease of use of the device. Users can easily carry and operate the device, making it suitable for home use and travel.

[0128] Through the precise control of the N-channel MOS tube and the adjustment unit 260 in the current control circuit, the device can output a stable current of the first frequency and the second frequency, effectively promoting blood circulation and deep skin care, and improving skin health and beauty. At the same time, the electrode assembly 100 includes multiple electrodes partially exposed outside the beauty head, which can evenly cover the skin surface, provide a more comprehensive and uniform current distribution, and enhance the care effect. The multi-electrode design also enables the device to adapt to the skin care needs of different parts.

[0129] Furthermore, the beauty head can be designed into an ergonomic shape to ensure the comfort and ease of operation of the device during use.

[0130] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent scheme changes made by using the contents of the utility model specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A current control circuit for a skin care device, characterized in that: include: An electrode assembly, the electrode assembly being used to output current to the skin; a current generating circuit, the current generating circuit being electrically connected to the electrode assembly and configured to output a current of a first frequency and a current of a second frequency to the electrode assembly; Wherein, the current generating circuit comprises: A transformer, wherein an output end of the transformer is electrically connected to the electrode assembly; A power circuit, the power circuit being electrically connected to a power input terminal of the transformer to supply power to the transformer; a driving circuit, the driving circuit being electrically connected to a signal input terminal of the transformer, and being used for providing the transformer with a driving signal of the first frequency and a driving signal of the second frequency, so as to drive the transformer to output a current of the first frequency and a current of the second frequency to the electrode assembly; The first frequency is less than or greater than the second frequency.

2. The current control circuit of the skin care device according to claim 1, characterized in that: The first frequency is greater than or equal to 70 kHz and less than or equal to 100 kHz; and / or, The second frequency is greater than or equal to 150 kHz and less than or equal to 300 kHz.

3. The current control circuit of the skin care device according to claim 1 or 2, characterized in that: The current generating circuit further comprises: An output control circuit is connected between the signal input terminal of the transformer and the drive circuit to control the output of the transformer.

4. The current control circuit of the skin care device according to claim 3, characterized in that: The transformer has two signal input terminals; The output control circuits include two, one of which is connected between one of the signal input terminals of the transformer and the drive circuit, and the other of which is connected between the other signal input terminal of the transformer and the drive circuit.

5. The current control circuit of the skin care device according to claim 3, characterized in that: The output control circuit comprises: A switch control unit, one end of which is connected to the signal input end of the transformer; An adjustment unit is connected between the driving circuit and the switch control unit to adjust a conduction speed of the switch control unit.

6. The current control circuit of the skin care device according to claim 5, characterized in that: The adjustment unit comprises a rising edge control circuit and a falling edge control circuit, wherein the rising edge control circuit and the falling edge control circuit are connected in parallel between the driving circuit and the switch control unit; The rising edge control circuit includes a first resistor, the falling edge control circuit includes a first diode, an anode of the first diode is connected to the switch control unit, and a cathode of the first diode is connected to the drive circuit.

7. The current control circuit of the skin care device according to claim 6, characterized in that: The falling edge control circuit further includes a second resistor, wherein the second resistor is connected between an anode of the first diode and the switch control unit, or the second resistor is connected between a cathode of the first diode and the drive circuit; and / or, The rising edge control circuit also includes a second diode, the anode of the second diode is connected to the drive circuit, and the first resistor is connected between the cathode of the second diode and the switch control unit; or, the cathode of the second diode is connected to the switch control unit, and the first resistor is connected between the anode of the second diode and the drive circuit.

8. The current control circuit of the skin care device according to claim 5, characterized in that: The switch control unit is a MOS tube, a gate of the switch control unit is electrically connected to the adjustment unit, a drain of the switch control unit is electrically connected to the signal input end of the transformer, and a source of the switch control unit is grounded.

9. The current control circuit of the skin care device according to claim 1 or 2, characterized in that: The electrode assembly includes at least two electrodes, and the output end of the transformer is connected to the at least two electrodes.

10. A skin care device, characterized in that: include: A shell, one end of which is formed with a beauty head; According to the current control circuit of the skin care device as described in any one of claims 1 to 9, the electrode assembly is at least partially exposed outside the beauty head to output current to the skin.

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