EMS micro-current self-checking circuit and equipment

Abstract

The utility model discloses an EMS micro-current self-checking circuit and equipment, and relates to the technical field of beauty equipment. The EMS micro-current self-checking circuit comprises a boost amplitude modulation circuit, a pulse width modulation circuit, a voltage amplitude feedback circuit and a main controller. The boost amplitude modulation circuit boosts an external power supply voltage into an excitation voltage and then outputs the excitation voltage. And the voltage amplitude feedback circuit outputs a corresponding feedback signal according to the excitation voltage. The main controller outputs a corresponding first control signal and outputs a pulse modulation signal according to the feedback signal. The boost amplitude modulation circuit also adjusts the amplitude of the excitation voltage according to the first control signal, and the pulse width modulation circuit converts the excitation voltage into an EMS electric signal for output according to the pulse modulation signal. According to the utility model, the excitation voltage can be accurately adjusted to be at a preset value, so that the output EMS electric signal can be accurately adjusted, the problem of large output current difference of beauty instruments in the same batch is solved, and the experience consistency of the beauty instruments in the same batch is ensured.

Description

Technical Field

[0001] This utility model relates to the field of beauty equipment technology, and in particular to an EMS microcurrent self-testing circuit and device. Background Technology

[0002] With the development of beauty technology, EMS (Electrical Muscle Stimulation) microcurrent beauty devices have become an important part of non-invasive beauty care. These devices utilize low-level currents to simulate the bio-currents naturally generated by the human body, penetrating the skin and tissues through gentle electrical waves to directly act on facial muscles. This electrical stimulation can promote blood and lymphatic circulation, increase cell activity, thereby accelerating collagen production, making the skin more elastic, facial contours firmer, and helping to eliminate edema and achieve a slimming effect.

[0003] However, in EMS microcurrent beauty devices, the current intensity output by the electrodes typically varies within the range of microamps to milliamps. Although manufacturers strive to ensure consistent performance of products of the same model and batch, the inherent tolerances of electronic components result in significant differences in output current between actual products. This not only affects the consistency of the user experience at the same settings but may also introduce uncertainty into treatment effectiveness and even pose safety hazards. Utility Model Content

[0004] The main purpose of this invention is to provide an EMS microcurrent self-test circuit, which addresses the problem of significant differences in output current among products from the same batch of existing EMS microcurrent beauty devices.

[0005] To achieve the above objectives, the EMS micro-current self-test circuit proposed in this utility model includes:

[0006] A boost amplitude modulation circuit is used to boost the external power supply voltage to the excitation voltage before output;

[0007] A pulse width modulation circuit, wherein the power supply terminal of the pulse width modulation circuit is connected to the output terminal of the boost amplitude modulation circuit, and the output terminal of the pulse width modulation circuit is used for electrode plate connection;

[0008] A voltage amplitude feedback circuit is provided, which is connected to the output terminal of the boost amplitude modulation circuit. The voltage amplitude feedback circuit is used to output a corresponding feedback signal according to the magnitude of the excitation voltage.

[0009] A main controller, which is connected with the signal input end of the boost amplitude modulation circuit, the signal input end of the pulse width modulation circuit and the signal output end of the voltage amplitude feedback circuit respectively; the main controller is used for outputting corresponding first control signals according to the feedback signals and outputting pulse modulation signals;

[0010] The boost amplitude modulation circuit is also used for adjusting the amplitude of the excitation voltage according to the first control signals.

[0011] The pulse width modulation circuit is used for converting the excitation voltage into EMS electrical signals according to the pulse modulation signals; wherein the EMS electrical signals are used for adjusting the pulse current output of the electrode sheet.

[0012] In an embodiment, the EMS micro-current self-checking circuit further comprises:

[0013] An electrode loop detection circuit, which is connected with the detection end of the pulse width modulation circuit, and the signal output end of the electrode loop detection circuit is connected with the main controller; the electrode loop detection circuit is used for outputting corresponding loop detection signals according to the voltage change of the detection end of the pulse width modulation circuit.

[0014] The main controller is also used for determining whether the electrode sheet forms a loop with the skin according to the loop detection signals.

[0015] In an embodiment, the boost amplitude modulation circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a boost chip.

[0016] Wherein one end of the first resistor is connected with the first control end of the main controller, the other end of the first resistor and one end of the first capacitor are connected with one end of the second resistor, the other end of the second resistor, one end of the third resistor and one end of the fourth resistor are connected with the signal input end of the boost chip, the other end of the third resistor is connected with the output end of the boost chip, and the other end of the fourth resistor is grounded with the other end of the first capacitor.

[0017] In an embodiment, the voltage amplitude feedback circuit comprises a fifth resistor and a sixth resistor.

[0018] Wherein one end of the fifth resistor is connected with the other end of the third resistor, the other end of the fifth resistor and one end of the sixth resistor are connected with the main controller, and the other end of the sixth resistor is grounded.

[0019] In an embodiment, the boost chip is MT3608 chip, and the boost amplitude modulation circuit further comprises a first diode and a first inductor.

[0020] The IN pin of the MT3608 chip is connected with one end of the first inductor, the other end of the first inductor and the SW pin of the MT3608 chip are connected with the positive electrode of the first diode, and the negative electrode of the first diode is the output end of the boost amplitude modulation circuit.

[0021] In an embodiment, the pulse width modulation circuit comprises a first triode, a second triode, a third triode, a fourth triode, a fifth triode and a sixth triode.

[0022] The base of the first triode is connected with the second control end of the main controller, the base of the second triode is connected with the third control end of the main controller, the collector of the first triode, the base of the third triode, the emitter of the third triode, the collector of the second triode, the base of the fourth triode, the emitter of the fourth triode and the output end of the boost amplitude modulation circuit are connected, the emitter of the first triode and the emitter of the second triode are grounded, the collector of the third triode, the first output end of the pulse width modulation circuit and the collector of the fifth triode are connected, the base of the fifth triode is connected with the third control end of the main controller, the collector of the fourth triode, the second output end of the pulse width modulation circuit and the collector of the sixth triode are connected, the base of the sixth triode is connected with the second control end of the main controller, and the emitter of the fifth triode and the emitter of the sixth triode are connected; wherein the second control end of the main controller and the third control end of the main controller are used for outputting pulse modulation signals which are opposite to each other.

[0023] In an embodiment, the first triode, the second triode, the fifth triode and the sixth triode are NPN triodes, and the third triode and the fourth triode are PNP triodes.

[0024] In an embodiment, the electrode loop detection circuit comprises:

[0025] A voltage acquisition circuit, which is connected with the detection end of the pulse width modulation circuit, is used for acquiring the voltage of the detection end of the pulse width modulation circuit and outputting a corresponding detection signal.

[0026] An operational amplifier circuit, of which the input end is connected with the signal output end of the voltage acquisition circuit, and the output end is connected with the main controller, is used for amplifying the detection signal as the loop detection signal output.

[0027] In an embodiment, the voltage acquisition circuit comprises a seventh resistor and an eighth resistor, one end of the seventh resistor is connected with the detection end of the pulse width modulation circuit, the other end of the seventh resistor and one end of the eighth resistor are connected with the input end of the operational amplifier circuit, and the other end of the eighth resistor is grounded.

[0028] The utility model discloses still provide a kind of equipment, including electrode sheet and the EMS micro-current self-checking circuit as described above.

[0029] The utility model technical scheme adopts a kind of EMS micro-current self-checking circuit, including boost amplitude modulation circuit, pulse width modulation circuit, voltage amplitude feedback circuit and main controller.Outside power voltage is boosted as excitation voltage by boost amplitude modulation circuit and is output, and voltage amplitude feedback circuit can detect the size of excitation voltage, and output corresponding feedback signal, and main controller can export corresponding first control signal according to feedback signal.Boost amplitude modulation circuit adjusts the boost amplitude of excitation voltage according to first control signal. In this way, main controller can accurately adjust the working state of boost amplitude modulation circuit, to ensure accurate excitation voltage level.Main controller is also used to output pulse modulation signal, and pulse width modulation circuit converts stable excitation voltage into EMS electric signal output according to pulse modulation signal. In this way, the actual size of excitation voltage is detected in this embodiment, and this information is fed back to main controller, to ensure that excitation voltage can be accurately adjusted to set value regardless of the change of external power voltage or environmental condition, deviation caused by electronic component tolerance can be compensated, and the consistency of EMS electric signal output in the same gear between different equipment is guaranteed. In this way, the EMS electric signal of the utility model can be accurately adjusted, the problem that the difference of output current of product of the same batch of existing beauty instrument is relatively obvious is solved, and the experience of product of the same batch of users in the same gear is ensured to be consistent. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structure shown in the drawings without creative labor for those skilled in the art.

[0031] Figure 1 The structure diagram of an embodiment of the EMS micro-current self-checking circuit provided by the utility model is shown;

[0032] Figure 2 The electronic circuit diagram of another embodiment of the EMS micro-current self-checking circuit provided by the utility model is shown;

[0033] Figure 3The utility model provides an electronic circuit diagram of another embodiment of EMS micro current self inspection circuit.

[0034] Explanation of reference numerals:

[0035]

[0036]

[0037] The realization, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0039] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0040] In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0041] In the EMS micro current beauty instrument, the current intensity output by the electrode usually varies in the range of microamperes to milliamperes. Although manufacturers strive to ensure that the performance of products of the same model and batch is consistent, due to the inherent tolerance of electronic components, the difference in output current between actual products is obvious. This not only affects the consistency of user experience at the same level, but also may cause uncertainty to the treatment effect, and even bring safety hazards.

[0042] The utility model provides a kind of EMS micro current self inspection circuit.

[0043] Please refer to Figure 1In an embodiment of the utility model, the EMS micro-current self-checking circuit comprises:

[0044] The boost amplitude modulation circuit 10 is used for boosting an external power supply voltage to an excitation voltage and then outputting;

[0045] The pulse width modulation circuit 20 is connected with the output end of the boost amplitude modulation circuit 10, and the output end of the pulse width modulation circuit 20 is used for connecting the electrode piece;

[0046] The voltage amplitude feedback circuit 30 is connected with the output end of the boost amplitude modulation circuit 10, and the voltage amplitude feedback circuit 30 is used for outputting a corresponding feedback signal according to the size of the excitation voltage;

[0047] The main controller 40 is connected with the signal input end of the boost amplitude modulation circuit 10, the signal input end of the pulse width modulation circuit 20 and the signal output end of the voltage amplitude feedback circuit 30 respectively, and the main controller 40 is used for outputting a corresponding first control signal according to the feedback signal and outputting a pulse modulation signal;

[0048] The boost amplitude modulation circuit 10 is also used for adjusting the amplitude of the excitation voltage according to the first control signal;

[0049] The pulse width modulation circuit 20 is used for converting the excitation voltage into an EMS electric signal output according to the pulse modulation signal, and the EMS electric signal is used for adjusting the pulse current output of the electrode piece.

[0050] It should be noted that the EMS micro-current self-checking circuit can be applied to a micro-current beauty instrument, the micro-current beauty instrument comprises an electrode piece, the electrode piece can be directly attached to a muscle area needing treatment or training, and the EMS electric signal generated by the EMS micro-current self-checking circuit is transmitted to muscle tissue in the form of current. This current stimulation can promote blood and lymph circulation, improve cell activity, and thus accelerate the generation of collagen.

[0051] In the embodiment, the boost amplitude modulation circuit 10 outputs the external power voltage after boosting the external power voltage to an excitation voltage, the voltage amplitude feedback circuit 30 can detect the size of the excitation voltage and output a corresponding feedback signal, and the main controller 40 can output a corresponding first control signal according to the feedback signal. The boost amplitude modulation circuit 10 adjusts the boost amplitude of the excitation voltage according to the first control signal. In this way, the main controller 40 can accurately adjust the working state of the boost amplitude modulation circuit 10 to ensure an accurate excitation voltage level. The main controller 40 is also used to output a pulse modulation signal, and the pulse width modulation circuit 20 converts the stable excitation voltage into an EMS electrical signal output according to the pulse modulation signal. Specifically, when the pulse modulation signal is high, the pulse width modulation circuit 20 outputs a current through the electrode sheet under the action of the excitation voltage to stimulate the target muscle. When the pulse modulation signal is low, the current path is cut off and the stimulation is stopped. The pulse width modulation circuit 20 can change the width of the output current according to the different duty cycles of the pulse modulation signal, thereby affecting the duration of the stimulation, and can change the direction of the current according to the different phases of the pulse modulation signal, so that the current can flow back and forth between the two electrodes of the electrode sheet to produce different stimulation effects. In this way, the pulse width modulation circuit 20 can output EMS electrical signals of different directions and widths to the electrode sheet, output pulse currents of different frequencies, waveforms, amplitudes, and durations through the electrode sheet, and then stimulate the muscle tissue in different ways to achieve the effect of beauty. The embodiment detects the actual size of the excitation voltage and feeds back this information to the main controller 40, ensuring that the excitation voltage can be accurately adjusted to the set value regardless of changes in the external power voltage or environmental conditions, which can compensate for deviations caused by electronic component tolerances and ensure the consistency of EMS electrical signals output by devices at the same level. In this way, the embodiment can accurately adjust the output EMS electrical signal, solve the problem of obvious differences in output current of products of the same batch of existing beauty instruments, ensure that products of the same batch have consistent user experience at the same level, and have better treatment effect and stronger safety.

[0052] The utility model discloses, boost amplitude modulation circuit 10 is boosted to the external power voltage as excitation voltage and exports, voltage amplitude feedback circuit 30 can detect the size of excitation voltage, and export corresponding feedback signal, and main controller 40 can according to feedback signal, export corresponding first control signal. Boost amplitude modulation circuit 10 is adjusted according to first control signal, and the boost amplitude of excitation voltage. Thus, main controller 40 can accurately adjust the working condition of boost amplitude modulation circuit 10 to guarantee accurate excitation voltage level. Main controller 40 is still used for outputting pulse modulation signal, and pulse width modulation circuit 20 will stable excitation voltage be converted into EMS electric signal output according to pulse modulation signal. Thus, the actual size of excitation voltage is detected in this embodiment, and this information is fed back to main controller 40, and it is guaranteed that no matter how external power voltage or environmental condition changes, excitation voltage can be accurately regulated to set value, and the deviation caused by electronic component tolerance can be compensated, and the consistency of EMS electric signal of different equipment between the same gear output is guaranteed. Thus, the utility model can accurately regulate the EMS electric signal of output, solves the problem that the difference of output current of the product of the same batch of the existing beauty instrument is more obvious, guarantees the experience of the product of the same batch to user under the same gear, and the treatment effect is better, and the safety is stronger.

[0053] Please refer to Figure 2 In an embodiment of the utility model, EMS micro-current self-checking circuit further includes:

[0054] Electrode loop detection circuit 50 is connected with the detection end of pulse width modulation circuit 20, and the signal output end of electrode loop detection circuit 50 is connected with main controller 40. Electrode loop detection circuit 50 is used for outputting corresponding loop detection signal according to the voltage change of the detection end of pulse width modulation circuit 20.

[0055] Main controller 40 is further used for determining whether the electrode sheet and the skin form a loop according to the loop detection signal.

[0056] In the embodiment, if the electrode patch is in good contact with the skin and forms a complete loop, an expected voltage drop will occur between the electrodes, and a corresponding voltage change will occur at the detection end of the pulse width modulation circuit 20, for example, the voltage change at the detection end of the pulse width modulation circuit 20 exceeds the preset standby range. On the contrary, if the contact is poor or a complete loop is not formed, the expected voltage change will not occur, and the voltage change at the detection end of the pulse width modulation circuit 20 is within the preset standby range. In this way, the main controller 40 can determine the voltage change range of the detection end of the pulse width modulation circuit 20 according to the loop detection signal output by the electrode loop detection circuit 50, so as to determine whether the electrode patch forms a loop with the skin. In this way, the embodiment can detect whether the electrode patch forms a loop with the skin, can monitor the connection quality between the electrode patch and the skin in real time, can respond in time in the case of poor contact or false triggering, and can ensure the safety, effectiveness and user experience of the electrical stimulation process.

[0057] Referring to Figure 2 In an embodiment of the present application, the voltage amplitude feedback circuit 30 comprises a fifth resistor R5 and a sixth resistor R6.

[0058] In an embodiment of the present application, the voltage amplitude feedback circuit 30 comprises a fifth resistor R5 and a sixth resistor R6.

[0059] In the embodiment, the main controller 40 can change the excitation voltage output by the output end of the voltage boosting chip U1 by outputting a first control signal to change the voltage of the signal input end of the voltage boosting chip U1. The first resistor R1 and the first capacitor C1 constitute a low-pass filter, which can filter the first control signal. The voltage boosting chip U1 has a feedback adjustment function, which can automatically adjust the working state of the internal device, such as changing the switching frequency or duty cycle, under the joint action of the sampling voltage sampled by the third resistor R3 and the fourth resistor R4 and the first control signal, to dynamically adjust the size of the excitation voltage to reach the preset level. In this way, the embodiment realizes precise control of the excitation voltage and provides stable and reliable power support for the output of the EMS electrical signal.

[0060] Referring to Figure 2 In an embodiment of the present application, the voltage amplitude feedback circuit 30 comprises a fifth resistor R5 and a sixth resistor R6.

[0061] One end of the fifth resistor R5 is connected with the other end of the third resistor R3, the other end of the fifth resistor R5 and one end of the sixth resistor R6 are connected with the main controller 40, and the other end of the sixth resistor R6 is grounded.

[0062] In the embodiment, the excitation voltage of the output end of the boost chip U1 is monitored by the voltage division network composed of the fifth resistor R5 and the sixth resistor R6, and the information is fed back to the main controller 40. In the embodiment, the main controller 40 can generate a PWM signal with a frequency lower than 10KHz, and the duty cycle of the signal can be dynamically adjusted according to the size of the feedback signal. The generated PWM signal is filtered by the low-pass filter composed of the first resistor R1 and the first capacitor C1, and the cut-off frequency of the filter can be 5.3KHz. The filtered PWM signal is converted into an average DC voltage, and the size of the average DC voltage depends on the duty cycle of the original PWM signal. A higher average voltage is generated by a higher duty cycle, and a lower average voltage is generated by a lower duty cycle. The filtered DC voltage is superimposed on the signal input end of the boost chip U1. The original feedback network is composed of the third resistor R3 and the fourth resistor R4, which provides a fixed voltage division ratio to set the initial output voltage level. When the average voltage of the PWM signal is superimposed on the signal input end of the boost chip U1, it will change the total value of the feedback voltage. If the average voltage of the PWM signal is high, the superimposed feedback voltage will also increase accordingly. According to the negative feedback principle, when the feedback voltage increases, the boost chip U1 will reduce its output to maintain the set voltage level. Therefore, if the deviation caused by the tolerance of electronic components is detected to cause the excitation voltage to be greater than the preset value, the main controller 40 outputs a PWM signal with a larger duty cycle, and the average voltage of the PWM signal increases, and the excitation voltage output by the boost chip U1 decreases. Similarly, if the deviation caused by the tolerance of electronic components is detected to cause the excitation voltage to be less than the preset value, the main controller 40 outputs a PWM signal with a smaller duty cycle, and the average voltage of the PWM signal decreases, and the excitation voltage output by the boost chip U1 increases. In this way, the embodiment can compensate for the deviation caused by the tolerance of electronic components, and if the excitation voltage level is detected to be out of the preset range, the working of the boost chip U1 can be controlled to adjust the output excitation voltage, and the consistency of the EMS electrical signals output by different devices at the same gear can be ensured.

[0063] Please refer to Figure 2 In an embodiment of the utility model, the boost chip U1 is MT3608 chip, and the boost amplitude modulation circuit 10 further includes the first diode D1 and the first inductor L1.

[0064] The IN pin of the MT3608 chip is connected with one end of the first inductor L1, the other end of the first inductor L1 and the SW pin of the MT3608 chip are connected with the anode of the first diode D1, and the cathode of the first diode D1 is the output end of the boost amplitude modulation circuit 10.

[0065] In the embodiment, the MT3608 chip is used to output the excitation voltage, has a wide input voltage range, multiple safety mechanisms such as built-in overheat protection, short circuit protection and overload protection, good linear and load regulation characteristics and the like, and can ensure the stability and accuracy of the output excitation voltage. The first inductor L1 and the SW pin of the MT3608 chip jointly act to store and release energy, so as to smooth the output voltage waveform. The first diode D1 acts as a freewheeling diode to prevent the inductive back electromotive force from damaging the circuit and to ensure unidirectional current flow and improve the stability of the output voltage. When the main controller 40 adjusts the output voltage through the PWM signal, the MT3608 chip can quickly respond to the changes and output a stable level of excitation voltage at the SW pin, so as to ensure that the same gear of different devices has consistent performance.

[0066] Please refer to Figure 3 In the embodiment of the utility model, pulse width modulation circuit 20 includes first triode Q1, second triode Q2, third triode Q3, fourth triode Q4, fifth triode Q5 and sixth triode Q6;

[0067] The base of the first triode Q1 is connected with the second control end P2 of the main controller 40, the base of the second triode Q2 is connected with the third control end P3 of the main controller 40, the collector of the first triode Q1, the base of the third triode Q3, the emitter of the third triode Q3, the collector of the second triode Q2, the base of the fourth triode Q4, the emitter of the fourth triode Q4 and the output end of the boost amplitude modulation circuit 10 are connected, the emitter of the first triode Q1 and the emitter of the second triode Q2 are grounded, the collector of the third triode Q3, the first output end EMS1 of the pulse width modulation circuit 20 and the collector of the fifth triode Q5 are connected, the base of the fifth triode Q5 is connected with the third control end P3 of the main controller 40, the collector of the fourth triode Q4, the second output end EMS2 of the pulse width modulation circuit 20 and the collector of the sixth triode Q6 are connected, the base of the sixth triode Q6 is connected with the second control end P2 of the main controller 40, the emitter of the fifth triode Q5 and the emitter of the sixth triode Q6 are connected, wherein the second control end P2 of the main controller 40 and the third control end P3 of the main controller 40 are used to output mutually inverse pulse modulation signals.

[0068] In an embodiment, the first transistor Q1, the second transistor Q2, the fifth transistor Q5 and the sixth transistor Q6 are NPN transistors, and the third transistor Q3 and the fourth transistor Q4 are PNP transistors.

[0069] In the embodiment, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5 and the sixth transistor Q6 form an H-bridge circuit, which can control the direction and duration of the current through the electrode piece in both directions. The first transistor Q1 and the second transistor Q2 control the working state of each transistor in the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5 and the sixth transistor Q6 by receiving the mutually inverted pulse modulation signals output by the second control terminal P2 of the main controller 40 and the third control terminal P3 of the main controller 40, thereby further controlling the direction and duration of the current. In the embodiment, the width of the pulse current output to the electrode piece (i.e., the proportion of the high level time in the entire period) can be changed by adjusting the duty cycle of the pulse modulation signal output by the main controller 40. At the same time, since the H-bridge circuit can switch the direction of the current, the main controller 40 can reverse the direction of the current by alternately activating different combinations of transistors, thereby achieving bidirectional current flow. In this way, a multi-segment pulse current waveform that varies with the period can be generated, different treatment effects can be achieved, and the user's experience when using the micro-current beauty instrument can be significantly improved.

[0070] Please refer to Figure 2 In an embodiment of the utility model, the electrode loop detection circuit 50 comprises:

[0071] The voltage acquisition circuit 51 is connected with the detection end of the pulse width modulation circuit 20, and the voltage acquisition circuit 51 is used to acquire the voltage of the detection end of the pulse width modulation circuit 20 and output corresponding detection signals;

[0072] The operational amplifier circuit 52 is connected with the signal output end of the voltage acquisition circuit 51, and the output end of the operational amplifier circuit 52 is connected with the main controller 40; the operational amplifier circuit 52 is used to amplify the detection signals into loop detection signals and output.

[0073] In an embodiment, the voltage acquisition circuit 51 comprises the seventh resistor R7 and the eighth resistor R8, one end of the seventh resistor R7 is connected with the detection end of the pulse width modulation circuit 20, the other end of the seventh resistor R7 and one end of the eighth resistor R8 are connected with the input end of the operational amplifier circuit 52, and the other end of the eighth resistor R8 is grounded.

[0074] In the embodiment, the detection end of the pulse width modulation circuit 20 is the connection between the collector of the fifth transistor Q5 and the collector of the sixth transistor, and the operational amplifier circuit 52 comprises an operational amplifier chip U2. When the beauty instrument is in standby, a loop is formed after the electrode piece is connected to the skin, at this time, any one of the second output end P2 of the main controller 40 or the third output end P3 of the main controller 40 can be controlled to be high level, and the high level time is determined according to the detection processing of the main controller 40, which can be tens to hundreds of milliseconds. In order to avoid that the voltage is too high to be perceived by the skin and affect the experience, the first output end P1 of the main controller 40 can be controlled to output the minimum excitation voltage during standby. At this time, the loop current signal is sampled through the seventh resistor R7 and the eighth resistor R8, and since the current signal of the detection signal is very weak, the operational amplifier circuit 52 is used for amplification and filtering processing, and the loop detection signal is output to the main controller 40. The output loop detection signal can be within the resolution 4096 of the 12-bit AD converter, so as to prevent data overflow and affect processing. In this way, the electrode loop detection circuit 50 can detect whether the electrode forms a loop with the skin, so as to detect whether the treatment head electrode piece of the beauty instrument is in complete contact with the skin, and prevent false triggering.

[0075] The utility model also proposes a kind of equipment, and the equipment includes electrode piece and EMS micro-current self-checking circuit, and the specific structure of the EMS micro-current self-checking circuit refers to above-mentioned embodiment, since the equipment adopts all technical solutions of above-mentioned embodiment, it at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, and here is not repeated one by one.Need to be explained, the equipment can be beauty instrument or other beauty equipment, not limited here.

[0076] The above-mentioned is only the exemplary implementation of the utility model, and not therefore limit the patent range of the utility model, any equivalent structural transformation made by using the utility model specification and drawing contents, or direct / indirectly applied in other related technical fields are included in the patent protection range of the utility model.

Claims

1. An EMS micro-current self-test circuit, comprising: The EMS micro-current self-checking circuit comprises: a boost amplitude modulation circuit, which is used for boosting an external power supply voltage into an excitation voltage and then outputting the excitation voltage; a pulse width modulation circuit, a power supply end of which is connected with an output end of the boost amplitude modulation circuit, and an output end of the pulse width modulation circuit is used for connecting with an electrode piece; a voltage amplitude feedback circuit, which is connected with the output end of the boost amplitude modulation circuit, and is used for outputting a corresponding feedback signal according to the size of the excitation voltage; a main controller, which is connected with a signal input end of the boost amplitude modulation circuit, a signal input end of the pulse width modulation circuit and a signal output end of the voltage amplitude feedback circuit respectively, and is used for outputting a corresponding first control signal according to the feedback signal and outputting a pulse modulation signal; the boost amplitude modulation circuit is further used for adjusting the amplitude of the excitation voltage according to the first control signal; the pulse width modulation circuit is used for converting the excitation voltage into an EMS electric signal output according to the pulse modulation signal, wherein the EMS electric signal is used for adjusting the pulse current output of the electrode piece.

2. The EMS micro-current self-test circuit of claim 1, wherein, The EMS micro-current self-checking circuit further comprises: an electrode loop detection circuit, which is connected with a detection end of the pulse width modulation circuit, and a signal output end of the electrode loop detection circuit is connected with the main controller, and the electrode loop detection circuit is used for outputting a corresponding loop detection signal according to the voltage change of the detection end of the pulse width modulation circuit; the main controller is further used for determining whether a loop is formed between the electrode piece and the skin according to the loop detection signal.

3. The EMS micro-current self-test circuit of claim 1, wherein, The boost amplitude modulation circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a boost chip. One end of the first resistor is connected with a first control end of the main controller, the other end of the first resistor and one end of the first capacitor are connected with one end of the second resistor, the other end of the second resistor, one end of the third resistor and one end of the fourth resistor are connected with a signal input end of the boost chip, the other end of the third resistor is connected with an output end of the boost chip, and the other end of the fourth resistor is grounded.

4. The EMS micro-current self-test circuit of claim 3, wherein, The voltage amplitude feedback circuit comprises a fifth resistor and a sixth resistor. One end of the fifth resistor is connected with the other end of the third resistor, the other end of the fifth resistor and one end of the sixth resistor are connected with the main controller, and the other end of the sixth resistor is grounded.

5. The EMS micro-current self-test circuit of claim 3, wherein, The boost chip is an MT3608 chip, and the boost amplitude modulation circuit further comprises a first diode and a first inductor. An IN pin of the MT3608 chip is connected with one end of the first inductor, the other end of the first inductor and a SW pin of the MT3608 chip are connected with a positive electrode of the first diode, and a negative electrode of the first diode is an output end of the boost amplitude modulation circuit.

6. The EMS micro-current self-test circuit of claim 1, wherein, The pulse width modulation circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor; The base of the first transistor is connected with the second control end of the main controller, the base of the second transistor is connected with the third control end of the main controller, the collector of the first transistor, the base of the third transistor, the emitter of the third transistor, the collector of the second transistor, the base of the fourth transistor, the emitter of the fourth transistor and the output end of the voltage amplitude modulation circuit are connected, the emitter of the first transistor and the emitter of the second transistor are grounded, the collector of the third transistor, the first output end of the pulse width modulation circuit and the collector of the fifth transistor are connected, the base of the fifth transistor is connected with the third control end of the main controller, the collector of the fourth transistor, the second output end of the pulse width modulation circuit and the collector of the sixth transistor are connected, the base of the sixth transistor is connected with the second control end of the main controller, and the emitter of the fifth transistor and the emitter of the sixth transistor are connected; wherein the second control end of the main controller and the third control end of the main controller are used for outputting pulse modulation signals which are opposite to each other.

7. The EMS micro-current self-test circuit of claim 6, wherein, The first transistor, the second transistor, the fifth transistor and the sixth transistor are NPN transistors, and the third transistor and the fourth transistor are PNP transistors.

8. The EMS micro-current self-test circuit of claim 2, wherein, The electrode loop detection circuit comprises: a voltage acquisition circuit, which is connected with the detection end of the pulse width modulation circuit, and is used for acquiring the voltage of the detection end of the pulse width modulation circuit and outputting a corresponding detection signal; an operational amplifier circuit, whose input end is connected with the signal output end of the voltage acquisition circuit, and whose output end is connected with the main controller; the operational amplifier circuit is used for amplifying the detection signal into the loop detection signal output.

9. The EMS micro-current self-test circuit of claim 8, wherein, The voltage acquisition circuit comprises a seventh resistor and an eighth resistor, one end of the seventh resistor is connected with the detection end of the pulse width modulation circuit, the other end of the seventh resistor and one end of the eighth resistor are connected with the input end of the operational amplifier circuit, and the other end of the eighth resistor is grounded.

10. An apparatus, comprising: The electrode sheet and the EMS micro-current self-detection circuit according to any one of claims 1 to 9 are comprised.

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