Micro-current constant-power control device and beauty instrument

Abstract

The utility model relates to the technical field of beauty instruments, and discloses a micro-current constant power control device and a beauty instrument, and the control device comprises a micro-current generation circuit which is used for generating micro-current output to skin; the control circuit is connected with the micro-current generation circuit and is used for controlling the micro-current generation circuit to output the micro-current; the detection circuit is electrically connected with the micro-current generation circuit and is used for acquiring a voltage signal in a skin contact micro-current path of the beauty instrument; the power adjusting circuit is connected with the control circuit; the control circuit is also used for receiving the voltage signal in the micro-current path and outputting a control signal to the power regulation circuit according to the voltage signal in the micro-current path; the power adjusting circuit is used for being controlled by the control circuit to adjust the voltage and the current of the micro-current output by the micro-current generating circuit so as to maintain constant power output and realize constant power output, the stability and the safety of the micro-current output are effectively improved, the pricking feeling formed in the beautifying process is reduced, and the user experience is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of beauty instrument technology, and in particular to a microcurrent constant power control device and a beauty instrument. Background Technology

[0002] In the field of microcurrent applications, especially in devices that come into contact with human skin, stable and appropriate microcurrent output is crucial. Currently, most existing technologies use a boost output method to control the microcurrent. However, the impedance of the device electrodes in contact with the skin is affected by a variety of complex factors, such as the contact area between the electrodes and the skin, whether gel is used, the degree of adhesion, skin humidity, temperature, and electrode material. These factors cause a large range of variations in skin impedance, resulting in significant differences in the user's sensation each time they use the device, leading to inconsistent user experience. Moreover, poor contact between the device electrodes and the user's skin can easily cause a stinging sensation, affecting the user's experience.

[0003] Therefore, improvements to existing technologies are necessary. Utility Model Content

[0004] This invention provides a microcurrent constant power control device and a beauty instrument to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A microcurrent constant power control device for use in a beauty instrument, comprising:

[0007] Microcurrent generation circuit, used to generate a microcurrent that is output to the skin;

[0008] A control circuit, and the microcurrent generating circuit, are used to control the output of a microcurrent by the microcurrent generating circuit;

[0009] The detection circuit is electrically connected to the microcurrent generation circuit and is used to acquire the voltage signal in the microcurrent path when the beauty device comes into contact with the skin.

[0010] The power regulation circuit is connected to the control circuit;

[0011] The control circuit is also used to receive the voltage signal in the micro-current path and output a control signal to the power regulation circuit according to the voltage signal in the micro-current path; the power regulation circuit is used to adjust the voltage and current of the micro-current output by the micro-current generation circuit under the control of the control circuit, so as to maintain a constant power output.

[0012] Optionally, the power regulation circuit includes:

[0013] A voltage regulation sub-circuit is electrically connected to the control circuit and the micro-current generation circuit, respectively, and is used to regulate the voltage of the micro-current output by the micro-current generation circuit under the control of the control circuit.

[0014] The current regulating sub-circuit is electrically connected to both the control circuit and the micro-current generating circuit, and is used to regulate the current of the micro-current output by the micro-current generating circuit under the control of the control circuit.

[0015] Optionally, the detection circuit includes: a filter circuit and a sampling resistor network;

[0016] The sampling resistor network is used to acquire the voltage signal in the micro-current path, and the filtering circuit is used to filter the voltage signal in the micro-current path.

[0017] Optionally, the voltage signal in the microcurrent path is the sampling voltage Vc of the sampling resistor network;

[0018] The control circuit is used to determine the lower voltage Vd of the microcurrent generation circuit based on the voltage sampling value Vc and the resistance value of the sampling resistor network, and to calculate the skin impedance according to the formula R=(Vv-Vd) / (Vi / Ri) based on the lower voltage Vd of the microcurrent generation circuit, the control voltage Vi output by the control circuit to the power regulation circuit, the driving voltage Vv of the microcurrent generation circuit, and the constant current resistance Ri of the current regulation sub-circuit.

[0019] Optionally, the voltage regulation sub-circuit includes a boost circuit sub-circuit and a voltage regulation matching sub-circuit. The voltage regulation matching sub-circuit is electrically connected to the control circuit and is used to adjust the output voltage of the boost circuit sub-circuit under the control of the control circuit.

[0020] Optionally, the current regulating sub-circuit includes:

[0021] transistor;

[0022] An operational amplifier, wherein the non-inverting output terminal of the operational amplifier is connected to the control terminal of the transistor, and the inverting input terminal is connected to one end of a constant current resistor Ri, for receiving the control voltage Vi output by the control circuit to control the conduction level of the transistor;

[0023] The constant current resistor Ri is connected in series with both the transistor and the microcurrent generation circuit, thereby forming a microcurrent output path;

[0024] The operational amplifier, transistor, and constant current resistor Ri form a closed-loop feedback structure. After the control circuit outputs the control voltage Vi, the current regulation sub-circuit is used to form deep negative feedback, so that the current on the constant current resistor Ri tends to be constant at Vi / Ri.

[0025] Optionally, the control circuit can be any one of a microcontroller circuit, an MCU, or an FPGA.

[0026] Optionally, the microcurrent generation circuit includes an H-bridge circuit, which includes multiple pairs of switching transistors. Each switching transistor is connected to a control circuit and is used to switch on and off under the control of the control circuit to generate a bi-phase symmetrical square wave.

[0027] Optionally, the control circuit is further configured to acquire a preset working level and, based on the skin impedance information and the power level corresponding to the preset working level, control the power adjustment circuit to output corresponding voltage and current.

[0028] This utility model also provides a beauty device, including the microcurrent constant power control device as described in any of the preceding claims.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] This utility model provides a microcurrent constant power control device and beauty instrument. It obtains the voltage signal in the microcurrent path in real time through the detection circuit, and dynamically adjusts the output voltage and current in combination with the control circuit to achieve constant power output. This effectively improves the stability and safety of microcurrent output, reduces the stinging sensation during the beauty process, and greatly improves the user experience.

[0031] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is an architectural diagram of a micro-current constant power control device provided in an embodiment of the present invention;

[0034] Figure 2 This is a circuit diagram of the power regulation circuit in a micro-current constant power control device provided in this embodiment of the utility model;

[0035] Figure 3This is a circuit diagram of the H-bridge circuit, current regulating sub-circuit, and detection circuit in a micro-current constant power control device provided in this embodiment of the utility model;

[0036] Figure 4 yes Figure 3 A magnified view of a portion of the image;

[0037] Figure 5 This is a comparison curve of skin impedance in constant power control and constant voltage control in the prior art provided by the embodiment of the present utility model.

[0038] Figure reference numerals: 100, detection circuit; 200, control circuit; 300, power regulation circuit; 301, voltage regulation sub-circuit; 3011, voltage regulation matching sub-circuit; 302, current regulation sub-circuit; 400, micro-current generation circuit; 410, H-bridge circuit. Detailed Implementation

[0039] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0040] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0041] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0042] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0043] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0044] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0045] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0046] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0047] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0048] Please refer to Figure 1 This utility model provides a micro-current constant power control device, comprising:

[0049] Microcurrent generating circuit 400 is used to generate a microcurrent that is output to the skin;

[0050] The control circuit 200 and the microcurrent generating circuit 400 are used to control the microcurrent generating circuit 400 to output a microcurrent.

[0051] The detection circuit 100 is electrically connected to the microcurrent generation circuit 400 and is used to acquire the voltage signal in the microcurrent path when the beauty device comes into contact with the skin.

[0052] The power regulation circuit 300 is connected to the control circuit 200. Under the control of the control circuit 200, it regulates the voltage and current of the micro-current to maintain constant power output.

[0053] The control circuit 200 is also used to receive the voltage signal in the micro-current path and output a control signal to the power adjustment circuit 300 based on the voltage signal in the micro-current path; the power adjustment circuit 300 is used to adjust the voltage and current of the micro-current output by the micro-current generation circuit 400 under the control of the control circuit 200, so as to maintain a constant power output.

[0054] By detecting the voltage signal in the microcurrent path when the beauty device comes into contact with the skin and dynamically adjusting the voltage and current, constant power output of microcurrent is achieved, effectively solving the problem of power fluctuation caused by changes in skin impedance in existing technologies, and improving the stability and comfort of users during use.

[0055] In some embodiments, the power regulation circuit 300 includes:

[0056] The voltage regulation sub-circuit 301 is electrically connected to the control circuit 200 and the micro-current generation circuit 400 respectively, and is used to adjust the voltage of the micro-current output by the micro-current generation circuit 400 under the control of the control circuit 200.

[0057] The current regulating sub-circuit 302 is electrically connected to the control circuit 200 and the micro-current generating circuit 400, respectively, and is used to regulate the current of the micro-current output by the micro-current generating circuit 400 under the control of the control circuit 200.

[0058] The voltage regulation sub-circuit 301 includes a PWM drive circuit and a boost circuit, which are used to regulate the output voltage of micro-current.

[0059] Specifically, the PWM drive circuit receives the PWM signal output by the control circuit 200. Under the control of the PWM drive circuit, the boost circuit increases the voltage of the micro-current to adapt to the voltage requirements under different impedance conditions. The boost circuit based on real-time PWM control can achieve efficient and precise voltage output regulation, avoiding energy waste or skin discomfort caused by a fixed output voltage.

[0060] In some embodiments, the current regulating sub-circuit 302 is used to regulate the magnitude of the micro-current. It is located at the ground-facing position of the micro-current generating circuit 400, specifically on the ground-facing side of the lower end of the H-bridge circuit 410. The current regulating sub-circuit 302 receives the Vi signal output by the control circuit 200 and controls the magnitude of the output current. Based on the aforementioned structure, dual-dimensional voltage and current regulation is achieved, ensuring that the micro-current is always output at an appropriate amplitude, avoiding overcurrent problems caused by impedance changes, and improving equipment safety.

[0061] In some embodiments, the current regulating sub-circuit 302 includes a transistor, an operational amplifier, and a constant current resistor Ri.

[0062] The non-inverting output of the operational amplifier is connected to the control terminal of the transistor to receive the control voltage Vi output by the control circuit 200, so as to control the conduction level of the transistor.

[0063] One end of the constant current resistor Ri is connected to the inverting input of the operational amplifier, and is connected in series with both the transistor and the micro-current generation circuit 400, thereby forming a micro-current output path.

[0064] The operational amplifier, transistor, and constant current resistor Ri form a closed-loop feedback structure. After the control circuit 200 outputs the control voltage Vi, the current regulation sub-circuit 302 is used to form deep negative feedback, so that the current on the constant current resistor Ri tends to be constant at Vi / Ri.

[0065] Specifically, the transistor, acting as a current regulation actuator, is connected to the ground terminal of the H-bridge circuit 410. The operational amplifier, also acting as a current regulation actuator, receives the signal converted from the PWM or DAC signal output by the control circuit 200 to control the conduction level of the transistor.

[0066] Furthermore, the current regulating sub-circuit 302 also includes a feedback resistor, which is used to monitor the actual output current of the microcurrent to form a current feedback signal and transmit the current feedback signal to the control circuit 200 to form a closed-loop control.

[0067] Please refer to Figure 2Furthermore, the voltage regulation sub-circuit 301 includes a boost circuit sub-circuit and a voltage regulation matching sub-circuit 3011. The voltage regulation matching sub-circuit 3011 is electrically connected to the control circuit 200 and is used to adjust the output voltage of the boost circuit sub-circuit under the control of the control circuit 200.

[0068] Closed-loop constant current control enhances the system's dynamic response capability, ensuring stable power output even when user operation changes or skin condition fluctuates, further reducing stinging sensation and thus improving user comfort.

[0069] In this embodiment, the detection circuit 100 includes:

[0070] Filtering circuit and sampling resistor network;

[0071] A sampling resistor network is used to acquire the voltage signal in the micro-current path, and a filtering circuit is used to filter the voltage signal in the micro-current path.

[0072] The sampling resistor network can be a voltage divider resistor network, and its output is connected to the ADC input terminal of the control circuit 200.

[0073] Based on this, the aforementioned structure enables rapid voltage sampling and high-precision impedance calculation, which is beneficial for providing a basis for subsequent dynamic power adjustment, thereby avoiding the defects of traditional beauty devices such as poor skin contact leading to stinging sensation.

[0074] Please refer to Figure 3 In some implementations, the voltage signal in the microcurrent path is the sampling voltage Vc of the sampling resistor network;

[0075] The control circuit 200 is used to determine the lower voltage Vd of the microcurrent generating circuit based on the voltage sampling value Vc and the resistance value of the sampling resistor network, and to calculate the skin impedance according to the formula R=(Vv-Vd) / (Vi / Ri) based on the lower voltage Vd of the microcurrent generating circuit, the control voltage Vi output by the control circuit 200 to the power regulation circuit 300, the drive voltage Vv of the microcurrent generating circuit, and the constant current resistance Ri of the current regulation sub-circuit 302.

[0076] Where Vv is the H-bridge drive voltage, which is preset by the control circuit 200; Vi is the voltage signal for controlling the current, specifically output by the DAC module of the control circuit 200; and Ri is the hardware constant current resistor.

[0077] By employing a clear mathematical model to calculate skin impedance, real-time and quantitative assessment of impedance is achieved, avoiding human error and thus improving the accuracy of dynamic power adjustment.

[0078] The control circuit 200 can be any of a microcontroller circuit, MCU, or FPGA; its signal acquisition port is connected to the sampling resistor network to receive the voltage value Vd.

[0079] In some embodiments, the control circuit 200 is further configured to acquire a preset working level and, based on skin impedance information and the power level corresponding to the preset working level, control the power adjustment circuit 300 to output the corresponding voltage and current.

[0080] Specifically, the control circuit 200 obtains the preset working level selected by the user to determine the output voltage, and calculates the target output power P in combination with the measured skin impedance. Based on the formula P=U×I, it generates PWM signal and DAC signal to control the voltage and current of the power regulation circuit 300 respectively, thereby achieving dynamic control.

[0081] Please refer to this again. Figure 1 In this embodiment, the voltage control method is the same as that of a normal constant voltage scheme. The output voltage is controlled by the PWM signal of the MCU to control the boost voltage.

[0082] Please refer to this again. Figure 3 In some embodiments, the microcurrent generation circuit 400 includes an H-bridge circuit 410. The H-bridge circuit 410 includes at least two pairs of switching transistors, such as MOSFETs or bipolar transistors; the switching transistors are connected to the control circuit 200 and alternately conduct under the drive of the PWM signal of the control circuit 200 to generate a bi-phase symmetrical square wave. For example, when Q11 and Q14 are on, the current is opposite to that when Q12 and Q13 are on, realizing alternating microcurrent output.

[0083] The symmetrical waveform output generated by the H-bridge circuit 410 is more suitable for skin contact scenarios, avoiding cumulative irritation to the skin caused by unidirectional current, and improving the comfort and uniformity of current stimulation.

[0084] Please refer to Figure 4 It is understandable that the implementation of the two-phase symmetrical square wave is similar to that of the constant voltage scheme, which obtains the two-phase symmetrical square wave by switching the transistors on and off using the H-bridge switch. Unlike the ordinary constant voltage scheme, this embodiment adds a current regulation sub-circuit 302 to the H-bridge to ground, and the MCU adjusts the magnitude of the micro-current by outputting a PWM or DAC signal.

[0085] The following describes the workflow of a micro-current constant power control device, using MCU as an example of control circuit 200:

[0086] The first step is to detect the impedance of the skin-mounted device. Here, Vd is the MCU's sampled value, Vi is the voltage value used by the MCU to control the micro-current, Vv is the MCU's drive voltage for the H-bridge, and the constant current resistor Ri is the hardware's resistance value.

[0087] As shown in Table 1 below, the MCU obtains Vd=2.5V through the sampling resistor network, with preset Vi=0.255V, Vv=5V, and Ri=51Ω;

[0088] Calculate the skin impedance R = (5 - 2.5) * 51 / 0.255 = 500Ω.

[0089] Table 1:

[0090]

[0091] Step 2: The MCU dynamically adjusts the output voltage and current according to different gear levels, thereby constantly controlling the output power of the micro-current.

[0092] As shown in the table below, if the user selects the high setting (P=0.8W), the MCU calculates the target voltage U=0.8×500=20V and the target current I=0.8 / 500=0.04A; it outputs a PWM signal to the boost circuit to adjust the output voltage to 20V, and at the same time outputs Vi=2.04V (Vi=Ri×I=51×0.04) to the constant current source to control the current to stabilize at 0.04A.

[0093]

[0094] Taking a constant power output of 0.8W from the MCU as an example, the following shows the power changes of constant power control and constant voltage control under different skin impedances.

[0095]

[0096] Based on the table above, when the skin impedance changes to 600Ω, the feedback resistor detects the current fluctuation, and the MCU automatically adjusts Vi to 1.86V. Through closed-loop control, the power is maintained at a constant 0.8W. The actual calculation process is as follows: U=0.8×600≈21.9V, which is dynamically adjusted through the boost circuit.

[0097] By combining user-defined needs with the actual condition of the skin, highly adaptable microcurrent output parameters are generated, enabling more intelligent and personalized microcurrent care. As shown in Figure 5, compared to constant voltage control, the constant power control scheme provided by the microcurrent constant power control device of this invention can greatly improve the stability of microcurrent output power.

[0098] This utility model embodiment also provides a beauty device, which includes the above-mentioned microcurrent constant power control device, and also includes conductive silicone electrodes and a control panel. The conductive silicone material is used in conjunction with the gel to identify impedance changes in real time.

[0099] Users can switch power levels via the control panel. The device has three power adjustment levels. After the user selects the level via the touch panel, the control circuit 200 automatically adjusts the voltage and current to achieve constant power output and realize personalized microcurrent care.

[0100] The beauty device provided in this embodiment of the invention can intelligently adapt the current output according to the user's skin condition, significantly improving the care experience and reducing burning and stinging sensations.

[0101] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A microcurrent constant power control device for use in a beauty instrument, characterized in that, include: Microcurrent generation circuit, used to generate a microcurrent that is output to the skin; A control circuit, and the microcurrent generating circuit, are used to control the output of a microcurrent by the microcurrent generating circuit; The detection circuit is electrically connected to the microcurrent generation circuit and is used to acquire the voltage signal in the microcurrent path when the beauty device comes into contact with the skin. The power regulation circuit is connected to the control circuit; The control circuit is also used to receive the voltage signal in the micro-current path and output a control signal to the power regulation circuit according to the voltage signal in the micro-current path; the power regulation circuit is used to adjust the voltage and current of the micro-current output by the micro-current generation circuit under the control of the control circuit, so as to maintain a constant power output.

2. The micro-current constant power control device according to claim 1, characterized in that, The power regulation circuit includes: A voltage regulation sub-circuit is electrically connected to the control circuit and the micro-current generation circuit, respectively, and is used to regulate the voltage of the micro-current output by the micro-current generation circuit under the control of the control circuit. The current regulating sub-circuit is electrically connected to both the control circuit and the micro-current generating circuit, and is used to regulate the current of the micro-current output by the micro-current generating circuit under the control of the control circuit.

3. The micro-current constant power control device according to claim 2, characterized in that, The detection circuit includes: a filter circuit and a sampling resistor network; The sampling resistor network is used to acquire the voltage signal in the micro-current path, and the filtering circuit is used to filter the voltage signal in the micro-current path.

4. The micro-current constant power control device according to claim 3, characterized in that, The voltage signal in the microcurrent path is the sampling voltage Vc of the sampling resistor network; The control circuit is used to determine the lower voltage Vd of the microcurrent generation circuit based on the voltage sampling value Vc and the resistance value of the sampling resistor network, and to calculate the skin impedance according to the formula R=(Vv-Vd) / (Vi / Ri) based on the lower voltage Vd of the microcurrent generation circuit, the control voltage Vi output by the control circuit to the power regulation circuit, the driving voltage Vv of the microcurrent generation circuit, and the constant current resistance Ri of the current regulation sub-circuit.

5. The micro-current constant power control device according to claim 2, characterized in that, The voltage regulation sub-circuit includes a boost circuit sub-circuit and a voltage regulation matching sub-circuit. The voltage regulation matching sub-circuit is electrically connected to the control circuit and is used to adjust the output voltage of the boost circuit sub-circuit under the control of the control circuit.

6. The micro-current constant power control device according to claim 2, characterized in that, The current regulating sub-circuit includes: transistor; An operational amplifier, wherein the non-inverting output terminal of the operational amplifier is connected to the control terminal of the transistor, and is used to receive the control voltage Vi output by the control circuit to control the conduction level of the transistor; A constant current resistor Ri, one end of which is connected to the inverting input terminal of the operational amplifier, and is connected in series with both the transistor and the micro-current generation circuit, thereby forming a micro-current output path; The operational amplifier, transistor, and constant current resistor Ri form a closed-loop feedback structure. After the control circuit outputs the control voltage Vi, the current regulation sub-circuit is used to form deep negative feedback, so that the current on the constant current resistor Ri tends to be constant at Vi / Ri.

7. The micro-current constant power control device according to claim 1, characterized in that, The control circuit can be any one of a microcontroller circuit, MCU, or FPGA.

8. The micro-current constant power control device according to claim 1, characterized in that, The microcurrent generation circuit includes an H-bridge circuit, which includes multiple pairs of switching transistors. Each switching transistor is connected to a control circuit and is used to switch on and off under the control of the control circuit to generate a bi-phase symmetrical square wave.

9. The micro-current constant power control device according to claim 1, characterized in that, The control circuit is also used to acquire a preset working level, and to control the power adjustment circuit to output corresponding voltage and current based on the skin impedance information and the power of the level corresponding to the preset working level.

10. A beauty device, characterized in that, Includes the microcurrent constant power control device as described in any one of claims 1 to 9.

Images