Muscle electric pulse signal output circuit, electrical equipment and beauty instrument control method

Abstract

The invention relates to the technical field of power electronics, and discloses a muscle electric pulse signal output circuit, electrical equipment and a beauty instrument control method.The circuit comprises a multivibrator circuit, a charging and discharging voltage division circuit and an operational amplifier circuit which are connected in sequence; the multivibrator circuit is used for generating a rectangular pulse signal with a preset frequency; the charging and discharging voltage division circuit is used for shaping the rectangular pulse signal to generate an alternating current wave signal; and the operational amplifier circuit is used for amplifying the alternating current wave signal to generate a muscle electric pulse signal with a preset frequency. The multi-vibrator circuit is used for generating the rectangular pulse signal with the preset frequency so as to control the working frequency of the muscle electric pulse signal, the muscle electric pulse signal can reach the optimal frequency for muscle stimulation, the rectangular pulse signal is shaped by the charging and discharging voltage division circuit and amplified by the operational amplification circuit, and the pulse signal can reach the optimal frequency for muscle stimulation. The muscle electrical pulse signal conforming to the optimal frequency of muscle stimulation is obtained, the user experience effect can be improved, and the performance and competitiveness of an application product are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to a muscle electric pulse signal output circuit, electrical equipment and a beauty instrument control method. Background Art

[0002] Devices on the market that use transformer solutions to generate the electrical muscle stimulation (EMS) signals required for beauty treatments, such as handheld beauty devices, usually use transformer solutions to generate the required EMS signals, and the operating frequency of the EMS generation circuit is generally around 20KHz. However, studies have shown that the optimal frequency for muscle stimulation is 1 to 5KHz, and the traditional EMS signal generation circuit has a poor stimulation effect and poor user experience. Summary of the invention

[0003] In view of this, the present invention provides a muscle electric pulse signal output circuit, electrical equipment and beauty instrument control method to solve the problem in the related art that the EMS generating circuit has a poor muscle stimulation effect due to its high operating frequency, resulting in poor user experience.

[0004] In a first aspect, the present invention provides a muscle electric pulse signal output circuit, comprising: a multivibrator circuit, a charge and discharge voltage divider circuit and an operational amplifier circuit connected in sequence;

[0005] The multivibrator circuit is used to generate a rectangular pulse signal of a preset frequency;

[0006] The charge-discharge voltage divider circuit is used to shape the rectangular pulse signal to generate an AC wave signal;

[0007] The operational amplifier circuit is used to amplify the AC wave signal to generate a muscle electrical pulse signal of the preset frequency.

[0008] The present invention utilizes a multivibrator circuit to generate a rectangular pulse signal of a preset frequency to control the operating frequency of the muscle electric pulse signal so that it can reach the optimal frequency of muscle stimulation, and obtains a muscle electric pulse signal that meets the optimal frequency of muscle stimulation by shaping the rectangular pulse signal through a charge and discharge voltage divider circuit and amplifying it through an operational amplifier circuit. Compared with the traditional EMS generation circuit composed of a transformer, the present invention can greatly enhance the user experience and improve the performance and competitiveness of the muscle electric pulse signal output circuit application products.

[0009] In an optional implementation, the multivibrator circuit includes: a 555 timer, a first resistor, a second resistor, a first capacitor and a first power supply;

[0010] The trigger end and the threshold end of the 555 timer are connected to one end of the first resistor and one end of the first capacitor respectively, the other end of the first resistor is connected to one end of the second resistor and the control end of the 555 timer respectively, and the other end of the first capacitor is grounded;

[0011] The other end of the second resistor is respectively connected to the reset end, the power supply end and the positive electrode of the first power supply of the 555 timer;

[0012] The negative electrode of the first power supply is connected to the ground terminal of the 555 timer and then grounded;

[0013] The output end of the 555 timer is connected to the input of the charge and discharge voltage divider circuit.

[0014] The present invention utilizes a 555 timer to form a multivibrator circuit, and can adjust the frequency of a rectangular pulse wave by adjusting the resistance values ​​of a first resistor and a second resistor and the capacitance value of a first capacitor, thereby adjusting the frequency of an EMS signal, thereby ensuring that the ultimately generated EMS signal is at the optimal frequency for muscle stimulation, thereby improving the user experience.

[0015] In an optional implementation, the multivibrator circuit further includes: a frequency control circuit, the frequency control circuit including: a first controlled switch and an eleventh resistor;

[0016] The first controlled switch is connected to the eleventh resistor and then connected in parallel to both ends of the first resistor.

[0017] The present invention sets a first controlled switch and an eleventh resistor in parallel at both ends of the first resistor, and uses the on and off of the first controlled switch to control the eleventh resistor to access the multivibrator circuit, which is equivalent to changing the resistance value of the first resistor, thereby realizing the adjustment of the frequency of the rectangular pulse wave, changing the frequency of the output EMS signal, and realizing the variable frequency control of the EMS signal, further improving the product experience of users under different needs, enriching the functions of the product, and improving customer satisfaction.

[0018] In an optional implementation, the charge-discharge voltage-dividing circuit includes: a second capacitor, a third resistor, a fourth resistor, a fifth resistor and a third capacitor;

[0019] One end of the second capacitor is connected to the output end of the multivibrator circuit, and the other end is connected to one end of the third resistor, and the other end of the third resistor is respectively connected to one end of the fourth resistor, one end of the fifth resistor, one end of the third capacitor and the input end of the operational amplifier circuit;

[0020] The other end of the fourth resistor is externally connected to an enable control signal, and the other end of the fifth resistor is connected to the other end of the third capacitor and then grounded.

[0021] The present invention uses the second capacitor to shape the rectangular pulse wave output by the multivibrator circuit into a positive and negative symmetrical rectangular wave, and then uses the third resistor, the fourth resistor, the fifth resistor and the third capacitor to form an RC charging and discharging circuit and a voltage divider circuit, so that the positive and negative symmetrical rectangular wave becomes a quasi-sine wave through the RC charging and discharging circuit, and the fourth resistor is controlled by an external enable control signal to form a voltage divider circuit with the third resistor and the fifth resistor, thereby changing the voltage amplitude at the third capacitor to generate AC wave signals with different amplitudes, thereby realizing the adjustment of the amplitude, that is, the intensity of the final EMS signal.

[0022] In an optional implementation, the operational amplifier circuit includes: a fourth capacitor, an operational amplifier, a second power supply, a sixth resistor, a seventh resistor, a fifth capacitor, a sixth capacitor and a seventh capacitor;

[0023] One end of the fourth capacitor is connected to the output end of the charge-discharge voltage divider circuit, and the other end is connected to the positive electrode of the second power supply and the positive end of the operational amplifier respectively;

[0024] The reverse end of the operational amplifier is connected to one end of the sixth resistor and the seventh resistor respectively, the power supply end is connected to the positive electrode of the second power supply, and the negative electrode of the second power supply is grounded;

[0025] The other end of the sixth resistor is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded;

[0026] The other end of the seventh resistor is connected to one end of the sixth capacitor and one end of the seventh capacitor respectively, the other end of the sixth capacitor is grounded, and the other end of the seventh capacitor outputs the muscle electric pulse signal of the preset frequency.

[0027] The present invention changes the voltage on the other side of the fourth capacitor by inputting an AC wave with a changing amplitude into the fourth capacitor, so that the voltage at the input terminal of the operational amplifier changes with the change of the AC wave, and the input voltage of the operational amplifier is constituted by superimposing the voltage of the second power supply. The reverse end of the operational amplifier is connected to the output end through an RC impedance network composed of a sixth resistor, a seventh resistor, and a fifth capacitor. Since the voltage at the sixth capacitor end cannot change suddenly, the waveform at the output terminal of the operational amplifier is guaranteed to be a quasi-sine wave. When the AC part of the AC wave with a changing amplitude input into the fourth capacitor changes from being higher than the average value to being lower than the average value, the output of the operational amplifier cannot be low immediately. The waveform output by the operational amplifier is converted into a positively and negatively symmetrical quasi-sine wave through the output of the seventh capacitor, and its frequency is the same as the output frequency of the 555 timer, thereby obtaining a preset frequency EMS signal.

[0028] In an optional implementation, the operational amplifier circuit further includes: an eighth resistor and a voltage divider circuit;

[0029] One end of the eighth resistor is connected to the other end of the seventh resistor, and the other end is connected to one end of the sixth capacitor;

[0030] The input end of the voltage divider circuit is connected to the positive electrode of the second power supply, and the output end is connected to the other end of the fourth capacitor.

[0031] The present invention realizes the regulation of the voltage amplitude of the connected operational amplifier circuit by setting a voltage divider circuit, and realizes the circuit current limiting function by setting an eighth resistor, thereby ensuring the safe operation of the circuit.

[0032] In an optional embodiment, the muscle electric pulse signal output circuit also includes: a second controlled switch, one end of the second controlled switch is connected to the output end of the operational amplifier circuit, and the other end is connected to the driving load of the muscle electric pulse signal output circuit.

[0033] The present invention flexibly controls the output of the muscle electric pulse signal by setting a second controlled switch, thereby realizing the output of the muscle electric pulse signal on demand and further improving the user experience.

[0034] In a second aspect, the present invention provides an electrical device, comprising: a muscle electric pulse signal output circuit as described in the first aspect and any optional embodiment thereof.

[0035] The present invention utilizes a multivibrator circuit to generate a rectangular pulse signal of a preset frequency to control the operating frequency of the muscle electric pulse signal so that it can reach the optimal frequency of muscle stimulation, and obtains a muscle electric pulse signal that meets the optimal frequency of muscle stimulation by shaping the rectangular pulse signal through a charge and discharge voltage divider circuit and amplifying it through an operational amplifier circuit. Compared with the traditional EMS generation circuit composed of a transformer, the present invention can greatly enhance the user experience and improve the performance and competitiveness of electrical equipment.

[0036] In an optional implementation, the electrical device is a beauty instrument.

[0037] The beauty instrument provided by the present invention can generate an EMS signal with an optimal frequency for muscle stimulation, thereby improving the beauty effect of the beauty instrument and enhancing the user's experience and satisfaction with the product.

[0038] In a third aspect, the present invention provides a beauty instrument control method, the beauty instrument includes a muscle electric pulse signal output circuit, the muscle electric pulse signal output circuit is the muscle electric pulse signal output circuit described in an optional manner of the first aspect, wherein the operational amplifier circuit includes: a fourth capacitor, an operational amplifier, a second power supply, a sixth resistor, a seventh resistor, a fifth capacitor, a sixth capacitor and a seventh capacitor; one end of the fourth capacitor is connected to the output end of the charge and discharge voltage divider circuit, and the other end is respectively connected to the positive electrode of the second power supply and the positive end of the operational amplifier; the reverse end of the operational amplifier is respectively connected to one end of the sixth resistor and the seventh resistor, the power supply end is connected to the positive electrode of the second power supply, and the negative electrode of the second power supply is grounded; the other end of the sixth resistor is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded; the other end of the seventh resistor is respectively connected to one end of the sixth capacitor and one end of the seventh capacitor, the other end of the sixth capacitor is grounded, and the other end of the seventh capacitor outputs the muscle electric pulse signal of the preset frequency; the method includes:

[0039] Get the current gear signal after the beauty instrument is turned on;

[0040] outputting a corresponding enable control signal to the other end of the fourth resistor based on the current gear position signal;

[0041] Controlling the first power supply and the second power supply to supply power, and controlling the first controlled switch to be disconnected, so that the beauty instrument operates for a first preset time;

[0042] After the beauty instrument runs for a first preset time, controlling the first power supply and the second power supply to stop supplying power, and controlling the beauty instrument to run for a second preset time;

[0043] After the beauty instrument runs for a second preset time, the first power supply and the second power supply are controlled to resume power supply, the first controlled switch is controlled to close, and the beauty instrument is controlled to run for a third preset time. The present invention realizes frequency-converting adaptive control of the muscle electric pulse signal of the beauty instrument by controlling the two power supplies and the first controlled switch of the beauty instrument according to the beauty instrument gear signal selected by the user, and avoids discomfort such as tingling on the user's skin by combining different operating time cycles and different frequencies. The beauty effect of the user can be further improved, and the user's use experience and satisfaction can be improved.

[0044] In an optional embodiment, after the beauty instrument has been running for a third preset time, the method further includes: re-executing the step of controlling the first power supply and the second power supply to supply power, and controlling the first controlled switch to disconnect, so that the beauty instrument runs for the first preset time, until the beauty instrument runs for the third preset time reaches a preset number of times, controlling the first power supply and the second power supply to stop supplying power, and controlling the first controlled switch to disconnect.

[0045] The present invention realizes automatic operation control of the beauty instrument by cyclically executing frequency conversion control, thereby improving the user experience.

[0046] In an optional implementation, outputting a corresponding enable control signal to the other end of the fourth resistor based on the current gear position signal includes:

[0047] When the current gear position signal corresponds to a high gear position, the corresponding enable control signal output to the other end of the fourth resistor is a high level signal;

[0048] When the current gear position signal corresponds to a low gear position, the corresponding enable control signal output to the other end of the fourth resistor is a low level signal.

[0049] The present invention controls the amplitude, i.e., the intensity, of the muscle electric pulse signal by controlling the enable control signal connected to the fourth resistor, thereby satisfying the user's beauty experience at different gears, achieving different gear adjustments, and further improving the user's usage experience and satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 is a schematic diagram of the structure of a muscle electric pulse signal output circuit according to an embodiment of the present invention;

[0052] Figure 2 is a schematic structural diagram of another muscle electric pulse signal output circuit according to an embodiment of the present invention;

[0053] Figure 3 is a structural block diagram of an electrical device according to an embodiment of the present invention;

[0054] Figure 4 is a flow chart of a beauty instrument control method according to an embodiment of the present invention;

[0055] Figure 5 is a schematic diagram of a specific operation process of a beauty instrument according to an embodiment of the present invention;

[0056] Figure 6 It is a schematic diagram of the hardware structure of the main control chip of the electrical equipment according to the embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0058] At present, the handheld beauty instrument solution mainly uses transformers to boost the voltage to generate the required EMS signal, but the operating frequency is generally high, generally around 20KHz, while research shows that the optimal frequency for muscle stimulation is 1-5KHz. The traditional EMS signal generation circuit has poor stimulation effect and poor user experience. Moreover, when the parameters are determined, variable frequency cannot be achieved.

[0059] The embodiment of the present invention is based on the demand of existing beauty instrument products for 1-5KHz frequency EMS signals and the demand for developing multiple frequency EMS signal coverage to improve the effect. A muscle electric pulse signal output circuit that can be applied to beauty instruments and a variable frequency control scheme for beauty instruments are proposed. EMS microcurrent signals with specific variable frequencies can be generated. The frequency range can be designed according to actual conditions, and the widest can reach 0.1KHz to 1000KHz, among which the optimal frequency band is 1-5KHz. Through the combination of multiple frequencies in the optimal frequency band, the needs of multiple skin stimulation can be met, so that the EMS microcurrent performance can be optimized.

[0060] According to an embodiment of the present invention, a muscle electric pulse signal output circuit embodiment is provided, such as Figure 1 As shown, the muscle electric pulse signal output circuit includes:

[0061] A multivibrator circuit 101, a charge-discharge voltage divider circuit 102 and an operational amplifier circuit 103 connected in sequence;

[0062] The multivibrator circuit 101 is used to generate a rectangular pulse signal of a preset frequency;

[0063] The charge and discharge voltage divider circuit 102 is used to shape the rectangular pulse signal to generate an AC wave signal;

[0064] The operational amplifier circuit 103 is used to amplify the AC wave signal to generate a muscle electrical pulse signal of a preset frequency.

[0065] The embodiment of the present invention utilizes a multivibrator circuit 101 to generate a rectangular pulse signal of a preset frequency to control the operating frequency of the muscle electric pulse signal so that it can reach the optimal frequency of muscle stimulation, and obtains a muscle electric pulse signal that meets the optimal frequency of muscle stimulation by shaping the rectangular pulse signal through a charge and discharge voltage divider circuit 102 and amplifying it through an operational amplifier circuit 103. Compared with the traditional EMS generating circuit using a transformer, the user experience can be greatly improved, and the performance and competitiveness of the muscle electric pulse signal output circuit application products can be improved.

[0066] In some optional embodiments, such as Figure 1 As shown, the multivibrator circuit 101 includes: a 555 timer U1, a first resistor R4, a second resistor R2, a first capacitor C4 and a first power supply DC1;

[0067] The trigger end and the threshold end of the 555 timer U1 are connected to one end of the first resistor R4 and one end of the first capacitor C4 respectively, the other end of the first resistor R4 is connected to one end of the second resistor R2 and the control end of the 555 timer U1 respectively, and the other end of the first capacitor C4 is grounded;

[0068] The other end of the second resistor R2 is respectively connected to the reset end, the power supply end and the positive electrode of the first power supply DC1 of the 555 timer U1;

[0069] The negative electrode of the first power supply DC1 is connected to the ground terminal of the 555 timer U1 and then grounded;

[0070] The output of the 555 timer U1 is connected to the input of the charge and discharge voltage divider circuit 102.

[0071] The embodiment of the present invention utilizes the 555 timer U1 to form a multivibrator circuit 101, and adjusts the resistance values ​​of the first resistor R4 and the second resistor R2 and the capacitance value of the first capacitor C4 to adjust the frequency of the rectangular pulse wave, thereby adjusting the frequency of the EMS signal, ensuring that the ultimately generated EMS signal is at the optimal frequency for muscle stimulation, thereby improving the user experience.

[0072] For example, Figure 1As shown, when R2 is 10KΩ, R4 is 100KΩ, and C4 is 4700pf, the high level t1 of the rectangular pulse is (R2+R4)C4*ln2=358us, the low level t2 is R4*C4*ln2=326us, the period T is (R2+2R4)C4*ln2=684us, and the frequency f1 is 1 / T=1 / ((R2+2R4)C4*ln2)=1.46Khz, where ln2 represents the base of the natural logarithm, and its value is about 0.7. It can be seen from this example that by selecting appropriate resistance and capacitance parameters, a rectangular wave of the desired frequency can be generated. At the same time, the amplitude of the rectangular waveform is the amplitude of DC1.

[0073] In some optional embodiments, such as Figure 2 As shown, the multivibrator circuit 101 further includes: a frequency control circuit, the frequency control circuit includes: a first controlled switch K1 and an eleventh resistor R13;

[0074] The first controlled switch K1 is connected to the eleventh resistor R13 and then connected in parallel to both ends of the first resistor R4.

[0075] Specifically, the first controlled switch K1 is a switch device with a circuit on-off function, such as an optocoupler, a relay, a triode, a MOS tube, etc., but the present invention is not limited thereto. In practical applications, the frequency control circuit further includes a peripheral circuit of the switch device, and its specific peripheral circuit composition is a prior art and will not be described in detail here. The resistance value of the eleventh resistor R13 can be flexibly set according to the actual frequency conversion frequency requirement, and the specific selection method can refer to the frequency calculation formula in the above example, which will not be described in detail here.

[0076] In the embodiment of the present invention, a first controlled switch K1 and an eleventh resistor R13 are connected in parallel at both ends of the first resistor R4, and the on and off of the first controlled switch K1 are used to control the eleventh resistor R13 to be connected to the multivibrator circuit 101, which is equivalent to changing the resistance value of the first resistor R4, thereby adjusting the frequency of the rectangular pulse wave, changing the frequency of the output EMS signal, and realizing the variable frequency control of the EMS signal, further improving the product experience of users under different needs, enriching the functions of the product, and improving customer satisfaction.

[0077] Specifically, Figure 2As shown, by connecting R13 in parallel at R4 and adding the first controlled switch K1, the output frequency of the multivibrator composed of the 555 timer U1 can be changed, thereby changing the frequency of the output EMS micro-current signal. Among them, the switch K1 can be a common control component such as an optocoupler and a relay. Exemplarily, when R2 is 10KΩ, R4 and R13 are 100KΩ, C4 is 4700pf, and K1 is closed, the high level t1 of the rectangular pulse is (R2+R4 / / R13)C4*ln2=195us, the low level t2 is (R4 / / R13)*C4*ln2=163us, the period T is (R2+2(R4 / / R13))C4*ln2=358us, and the frequency f2 is 1 / T=1 / ((R2+2(R4 / / R13))C4*ln2)=2.79Khz. In combination with another example provided in an embodiment of the present invention, it can be seen that when K1 is disconnected, the output frequency is 1.46KHz, and when K1 is closed, the output frequency is 2.79KHz, thereby achieving variable frequency output and meeting the optimal muscle stimulation frequency requirement of 1 to 5KHz.

[0078] In some optional embodiments, such as Figure 1 As shown, the above-mentioned charge and discharge voltage divider circuit 102 includes: a second capacitor C2, a third resistor R5, a fourth resistor R1, a fifth resistor R6 and a third capacitor C5;

[0079] One end of the second capacitor C2 is connected to the output end of the multivibrator circuit 101, and the other end is connected to one end of the third resistor R5. The other end of the third resistor R5 is respectively connected to one end of the fourth resistor R1, one end of the fifth resistor R6, one end of the third capacitor C5 and the input end of the operational amplifier circuit 103;

[0080] The other end of the fourth resistor R1 is externally connected to the enable control signal, and the other end of the fifth resistor R6 is connected to the other end of the third capacitor C5 and then grounded.

[0081] For example, Figure 1 As shown in the figure, C2 shapes the rectangular wave with a low level of about 0V into a positive and negative symmetrical rectangular wave; R5, C5, R6 and R1 form an RC charge and discharge circuit and a voltage divider circuit. The positive and negative symmetrical rectangular wave becomes a quasi-sine wave through the RC charge and discharge circuit. R1 is controlled by the signal MCU_CTRL of the main control chip MCU. When it is not enabled, the signal is left floating. When enabled, MCU_CTRL is set low, and together with R5 and R6, a voltage divider circuit is formed to change the voltage amplitude at C5. When MCU_CTRL is set low, R1 is grounded, and R1 is connected in parallel with R6, which reduces the voltage divider resistance, resulting in a decrease in the amplitude of the waveform at the positive end of C5, which in turn affects the amplitude of the EMS waveform output in the end.

[0082] In the embodiment of the present invention, the second capacitor C2 is used to shape the rectangular pulse wave output by the multivibrator circuit 101 into a positive and negative symmetrical rectangular wave, and then the third resistor R5, the fourth resistor R1, the fifth resistor R6 and the third capacitor C5 are used to form an RC charge and discharge circuit and a voltage divider circuit, so that the positive and negative symmetrical rectangular wave becomes a quasi-sine wave through the RC charge and discharge circuit, and the fourth resistor R1 is controlled by an external enable control signal to form a voltage divider circuit with the third resistor R5 and the fifth resistor R6, thereby changing the voltage amplitude at the third capacitor C5 to generate AC wave signals of different amplitudes, thereby realizing the adjustment of the amplitude, that is, the intensity of the final EMS signal.

[0083] In some optional embodiments, such as Figure 1 As shown, the operational amplifier circuit 103 includes: a fourth capacitor C6, an operational amplifier U2, a second power supply DC2, a sixth resistor R10, a seventh resistor R9, a fifth capacitor C7, a sixth capacitor C9 and a seventh capacitor C8;

[0084] One end of the fourth capacitor C6 is connected to the output end of the charge-discharge voltage divider circuit 102, and the other end is connected to the positive electrode of the second power supply DC2 and the positive terminal of the operational amplifier U2 respectively;

[0085] The reverse end of the operational amplifier U2 is connected to one end of the sixth resistor R10 and the seventh resistor R9 respectively, the power supply end is connected to the positive electrode of the second power supply DC2, and the negative electrode of the second power supply DC2 is grounded;

[0086] The other end of the sixth resistor R10 is connected to one end of the fifth capacitor C7, and the other end of the fifth capacitor C7 is grounded;

[0087] The other end of the seventh resistor R9 is connected to one end of the sixth capacitor C9 and one end of the seventh capacitor C8 respectively, the other end of the sixth capacitor C9 is grounded, and the other end of the seventh capacitor C8 outputs a muscle electrical pulse signal of a preset frequency.

[0088] For example, since the AC voltage amplitude at C6 cannot meet the requirements of the output EMS, the operational amplifier U2 and the surrounding circuits are required to amplify and shape the AC voltage amplitude to form the amplitude and waveform required by the EMS. Figure 1 As shown in the figure, due to the AC characteristics of C6, the change of the voltage amplitude at C5 will also cause the voltage on the right side of C6 to change, that is, the voltage at the positive end of U2 will change accordingly. That is, the AC wave (quasi-sine wave) generated here finally enters one end of U2. R7 and R8 divide the DC power supply DC2, and the voltage is V1=R7 / (R7+R8)*DC2. Then the positive end of the operational amplifier U2 is the superposition of the DC voltage of V1 and the power supply entering C6.

[0089] The output terminals R9, R10, and C7 are RC impedance networks. The voltage of C9 (R11 is a current limiting resistor, and its value is generally not more than 1Ω, and the typical value is 0.1Ω) cannot change suddenly. Therefore, when the AC part entering the positive end of U2 exceeds the average value, the output OUTA of U2 cannot be high immediately. The main charging circuit is R9, R10, and C7. The function of the charging circuit is to prevent the output waveform from changing suddenly, and it is a quasi-sine wave, rather than outputting a sudden waveform, such as a rectangular wave, to ensure that the output waveform meets the EMS signal requirements. Similarly, when the AC part entering C6 changes from being higher than the average value to being lower than the average value, the output terminal of U2 cannot be low immediately. The waveform output from the output terminal of U2 is converted into a positive and negative symmetrical quasi-sine wave through the output of C8, and its frequency is the same as the output frequency of the 555 timer U1. This output waveform is the required EMS waveform.

[0090] In the embodiment of the present invention, an AC wave with a changing amplitude is input to the fourth capacitor C6 to change the voltage on the other side of the fourth capacitor C6, so that the voltage at the input terminal of the operational amplifier U2 changes with the change of the AC wave. The input voltage of the operational amplifier U2 is formed by superimposing the voltage of the second power supply DC2. The reverse end of the operational amplifier U2 is connected to the output end through an RC impedance network composed of a sixth resistor R10, a seventh resistor R9, and a fifth capacitor C7. Since the voltage at the end of the sixth capacitor C9 cannot change suddenly, the waveform at the output terminal of the operational amplifier U2 is guaranteed to be a quasi-sine wave. When the AC part of the AC wave with a changing amplitude input to the fourth capacitor C6 changes from being higher than the average value to being lower than the average value, the output of the operational amplifier U2 cannot be low immediately. The waveform output by the operational amplifier U2 becomes a positive and negative symmetrical quasi-sine wave through the output of the seventh capacitor C8, and its frequency is the same as the output frequency of the 555 timer U1, thereby obtaining a preset frequency EMS signal.

[0091] In some optional embodiments, such as Figure 1 As shown, the operational amplifier circuit 103 further includes: an eighth resistor R11 and a voltage divider circuit;

[0092] One end of the eighth resistor R11 is connected to the other end of the seventh resistor R9, and the other end is connected to one end of the sixth capacitor C9;

[0093] The input end of the voltage divider circuit is connected to the positive electrode of the second power supply DC2, and the output end is connected to the other end of the fourth capacitor C6.

[0094] Specifically, Figure 1As shown, the voltage divider circuit is composed of a ninth resistor R8 and a tenth resistor R7, and the selection of the specific resistance value can be flexibly set according to the voltage division requirement and the supply voltage of the second power supply DC2. Similarly, the resistance value of the eighth resistor R11 is also set according to the current limiting requirement of the actual circuit, which will not be repeated here. The voltage divider circuit directly follows the reverse end of the operational amplifier U2 by providing a DC voltage divider to the operational amplifier U2. That is, the voltage value of the reverse end is increased, thereby changing the voltage at the output end of the operational amplifier U2.

[0095] The embodiment of the present invention achieves adjustment of the voltage amplitude of the circuit connected to the operational amplifier U2 by setting a voltage divider circuit, and achieves the function of circuit current limiting by setting the eighth resistor R11, thereby ensuring the safe operation of the circuit.

[0096] In some optional embodiments, the muscle electric pulse signal output circuit provided in the embodiment of the present invention also includes: a second controlled switch K2, one end of the second controlled switch K2 is connected to the output end of the operational amplifier circuit 103, and the other end is connected to the driving load of the muscle electric pulse signal output circuit.

[0097] Specifically, the second controlled switch K2 is a switch device with a circuit on-off function, such as an optical coupler, a relay, a triode, a MOS tube, etc., but the present invention is not limited thereto. In practical applications, the peripheral circuit of the switch device can be flexibly arranged according to the circuit structure, and the specific peripheral circuit composition is a prior art and will not be described in detail here.

[0098] The embodiment of the present invention flexibly controls the output of the muscle electric pulse signal by setting the second controlled switch K2, thereby realizing the output of the muscle electric pulse signal on demand and further improving the user experience.

[0099] According to an embodiment of the present invention, there is also provided an electrical device, such as Figure 3 As shown, the electrical device includes: a muscle electric pulse signal output circuit 301 provided in another embodiment of the present invention.

[0100] The embodiment of the present invention utilizes a multivibrator circuit to generate a rectangular pulse signal of a preset frequency to control the operating frequency of the muscle electric pulse signal so that it can reach the optimal frequency of muscle stimulation, and obtains a muscle electric pulse signal that meets the optimal frequency of muscle stimulation by shaping the rectangular pulse signal through a charge and discharge voltage divider circuit and amplifying it through an operational amplifier circuit. Compared with the traditional EMS generating circuit composed of a transformer, the user experience can be greatly improved, and the performance and competitiveness of electrical equipment can be improved.

[0101] Specifically, in practical applications, the above-mentioned electrical equipment is a beauty instrument.

[0102] The beauty instrument provided by the embodiment of the present invention can generate an EMS signal with an optimal frequency for muscle stimulation, thereby improving the beauty effect of the beauty instrument and enhancing the user's experience and satisfaction with the product.

[0103] Furthermore, the electrical device also includes: a main control chip, which is connected to the muscle electric pulse signal output circuit, and is used to control the first power supply, the second power supply, the first controlled switch, the second controlled switch and other circuit components in the muscle electric pulse signal output circuit, and output an enable control signal to the circuit to achieve operation control of the entire muscle electric pulse signal output circuit. Exemplarily, the control can be a control chip such as an MCU or a single-chip microcomputer. In actual applications, when the electrical device is a beauty instrument, the main control chip is a control chip built into the beauty instrument.

[0104] According to an embodiment of the present invention, a beauty instrument control method is also provided, which is applied to a main control chip of a beauty instrument such as an MCU, a single chip microcomputer, etc. The beauty instrument includes: Figure 2 The muscle electric pulse signal output circuit shown in FIG. Figure 4 As shown, the beauty instrument control method includes the following steps:

[0105] Step S401, obtaining a current gear position signal after the beauty instrument is turned on.

[0106] Specifically, the beauty instrument can set one or more gears according to product design requirements to provide users with different functional beauty services. In the embodiment of the present invention, the high and low gears are used as examples for description. This is only an example, and the present invention is not limited to this.

[0107] Step S402: outputting a corresponding enable control signal to the other end of the fourth resistor based on the current gear position signal.

[0108] Specifically, the above step S402 includes:

[0109] When the current gear position signal corresponds to a high gear, the corresponding enable control signal output to the other end of the fourth resistor is a high level signal; when the current gear position signal corresponds to a low gear, the corresponding enable control signal output to the other end of the fourth resistor is a low level signal.

[0110] The embodiment of the present invention controls the amplitude, i.e., the intensity, of the muscle electrical pulse signal by controlling the enable control signal connected to the fourth resistor, thereby satisfying the user's beauty experience at different gears, achieving different gear adjustments, and further improving the user's usage experience and satisfaction.

[0111] Step S403, controlling the first power supply and the second power supply to supply power, and controlling the first controlled switch to be disconnected, so that the beauty instrument runs for a first preset time.

[0112] Step S404, after the beauty instrument runs for a first preset time, the first power supply and the second power supply are controlled to stop supplying power, and the beauty instrument is controlled to run for a second preset time.

[0113] Step S405, after the beauty instrument runs for a second preset time, control the first power supply and the second power supply to resume power supply, control the first controlled switch to close, and control the beauty instrument to run for a third preset time.

[0114] Step S406, after the beauty instrument has run for the third preset time, return to the step of controlling the first power supply and the second power supply to supply power, and controlling the first controlled switch to disconnect, so that the beauty instrument runs for the first preset time, until the beauty instrument runs for the third preset time reaches the preset number of times, then control the first power supply and the second power supply to stop supplying power, and control the first controlled switch to disconnect.

[0115] The embodiment of the present invention realizes automatic operation control of the beauty instrument by cyclically executing frequency conversion control, thereby improving the user experience.

[0116] Specifically, when the EMS signal is used on the skin, long-term use may cause the following side effects: skin irritation. Long-term use of the EMS function may irritate the skin, causing redness, itching or pain; muscle fatigue. Excessive use of EMS may cause muscle fatigue and may even cause muscle pain or soreness; nerve damage. Long-term high-intensity electrical stimulation may damage the nerves, causing paresthesia or paralysis; dry skin: during electrical stimulation, the skin may become dry and require proper hydration. Therefore, in daily use (i.e., daily use), the duration usually does not exceed 6 minutes. Some beauty devices are used for an extended period of time once a week, but the duration is generally within 10 minutes. Therefore, the first preset duration T1 is the time for outputting low frequency f1 in one cycle, usually 1-180s; the third preset duration T3 is the time for outputting high frequency f3 in one cycle, usually 1-180s; the second preset duration T2 is the time to stop output when switching frequency. The purpose of stopping output is to prevent the frequency from switching directly, resulting in abnormally high signals and causing skin tingling. To avoid interrupting the output for too long and achieve a better user experience, the second preset time length T2 is generally not greater than 1s; at the same time, to ensure that no abnormally high signal is generated, the second preset time length T2 is generally greater than 15ms.

[0117] The embodiment of the present invention realizes variable frequency adaptive control of the muscle electric pulse signal of the beauty instrument by controlling the two power supplies and the first controlled switch of the beauty instrument according to the beauty instrument gear signal selected by the user, and avoids discomfort such as tingling on the user's skin by combining different operating time cycles and different frequencies. The beauty effect of the user can be further improved, and the user experience and satisfaction can be improved.

[0118] The working principle and working process of the beauty instrument control method provided by the embodiment of the present invention will be described in detail below in conjunction with specific application examples.

[0119] For example, with Figure 2 Taking the handheld beauty instrument with the muscle electric pulse signal output circuit shown in FIG. as an example, the specific working process of the handheld beauty instrument realizing frequency conversion output to provide beauty services to users is as follows: Figure 5 shown.

[0120] After the beauty instrument is turned on, the gear signal is read. The corresponding product design parameters of the beauty instrument product include the preset duration T1, T2, T3 and the number of cycles N0;

[0121] The control state of the MCU_CTRL of the IO port of the main control chip of the beauty instrument is determined according to the gear signal. If the gear is high, MCU_CTRL is set to high impedance, and R1 does not participate in the parallel voltage division; if the gear is low, MCU_CTRL is set to 0, R1 and R5 are connected in parallel, and the voltage division is reduced. It should be noted that in the embodiment of the present invention, the beauty instrument with high and low gears is used as an example for description. If the beauty instrument needs to add more gears, it only needs to increase the IO port control accordingly. The specific implementation process will not be repeated here.

[0122] When DC1 and DC2 are powered on and K1 is disconnected, the EMS micro-current signal outputs a lower frequency f1;

[0123] If the EMS microcurrent signal running time reaches T1, DC1 and DC2 are turned off and the output of the EMS microcurrent signal is stopped; the purpose of stopping the output is to prevent the frequency from switching directly, resulting in an abnormally high signal, causing skin tingling and affecting the user experience.

[0124] When the output stops for T2, DC1 and DC2 are powered on, and K1 is closed, the EMS microcurrent signal outputs a higher frequency f2. To avoid interrupting the output for too long and achieve a better user experience, T2 is generally not greater than 1s; at the same time, to ensure that no abnormally high signal is produced, T2 is generally greater than 15ms.

[0125] When the output frequency f2 reaches T3, a cycle is satisfied, and the number of cycles N increases by 1. When N≥N0, the EMS signal output ends, otherwise, it enters the next cycle.

[0126] Since the degree of skin dryness varies greatly among consumers, and the degree of skin dryness varies greatly among consumers in different seasons, the degree of skin adaptability to the amplitude of the EMS signal varies among users. It should be noted that in this example, the amplitude of the EMS signal is controlled by controlling DC1 and DC2 to control whether the EMS signal is output or not. In actual applications, only one of DC1 or DC2 can be controlled to achieve the same purpose. Alternatively, a corresponding switch control can be added to the EMS signal output OUT terminal, such as Figure 2 K2 shown can also achieve the same purpose.

[0127] See also Figure 6 , Figure 6 is a schematic diagram of the structure of a main control chip of an electrical device provided by an optional embodiment of the present invention, such as Figure 6 As shown, the main control chip includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 6 A processor 10 is taken as an example.

[0128] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0129] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0130] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0131] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0132] The main control chip also includes a communication interface 30, which is used for the main control chip to communicate with other devices or communication networks.

[0133] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor main control chip or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0134] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A muscle electric pulse signal output circuit, characterized in that: include: A multivibrator circuit, a charge-discharge voltage divider circuit and an operational amplifier circuit connected in sequence; The multivibrator circuit is used to generate a rectangular pulse signal of a preset frequency; The charge-discharge voltage divider circuit is used to shape the rectangular pulse signal to generate an AC wave signal; The operational amplifier circuit is used to amplify the AC wave signal to generate a muscle electrical pulse signal of the preset frequency.

2. The muscle electric pulse signal output circuit according to claim 1, characterized in that: The multivibrator circuit comprises: a 555 timer, a first resistor, a second resistor, a first capacitor and a first power supply; The trigger end and the threshold end of the 555 timer are connected to one end of the first resistor and one end of the first capacitor respectively, the other end of the first resistor is connected to one end of the second resistor and the control end of the 555 timer respectively, and the other end of the first capacitor is grounded; The other end of the second resistor is respectively connected to the reset end, the power supply end and the positive electrode of the first power supply of the 555 timer; The negative electrode of the first power supply is connected to the ground terminal of the 555 timer and then grounded; The output end of the 555 timer is connected to the input of the charge and discharge voltage divider circuit.

3. The muscle electric pulse signal output circuit according to claim 2, characterized in that: The multivibrator circuit further comprises: a frequency control circuit, the frequency control circuit comprising: a first controlled switch and an eleventh resistor; The first controlled switch is connected to the eleventh resistor and then connected in parallel to both ends of the first resistor.

4. The muscle electric pulse signal output circuit according to claim 1, characterized in that: The charge-discharge voltage-dividing circuit comprises: a second capacitor, a third resistor, a fourth resistor, a fifth resistor and a third capacitor; One end of the second capacitor is connected to the output end of the multivibrator circuit, and the other end is connected to one end of the third resistor, and the other end of the third resistor is respectively connected to one end of the fourth resistor, one end of the fifth resistor, one end of the third capacitor and the input end of the operational amplifier circuit; The other end of the fourth resistor is externally connected to an enable control signal, and the other end of the fifth resistor is connected to the other end of the third capacitor and then grounded.

5. The muscle electric pulse signal output circuit according to claim 1, characterized in that: The operational amplifier circuit comprises: a fourth capacitor, an operational amplifier, a second power supply, a sixth resistor, a seventh resistor, a fifth capacitor, a sixth capacitor and a seventh capacitor; One end of the fourth capacitor is connected to the output end of the charge-discharge voltage divider circuit, and the other end is connected to the positive electrode of the second power supply and the positive end of the operational amplifier respectively; The reverse end of the operational amplifier is connected to one end of the sixth resistor and the seventh resistor respectively, the power supply end is connected to the positive electrode of the second power supply, and the negative electrode of the second power supply is grounded; The other end of the sixth resistor is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded; The other end of the seventh resistor is connected to one end of the sixth capacitor and one end of the seventh capacitor respectively, the other end of the sixth capacitor is grounded, and the other end of the seventh capacitor outputs the muscle electric pulse signal of the preset frequency.

6. The muscle electric pulse signal output circuit according to claim 5, characterized in that: The operational amplifier circuit further includes: an eighth resistor and a voltage divider circuit; One end of the eighth resistor is connected to the other end of the seventh resistor, and the other end is connected to one end of the sixth capacitor; The input end of the voltage divider circuit is connected to the positive electrode of the second power supply, and the output end is connected to the other end of the fourth capacitor.

7. The muscle electric pulse signal output circuit according to any one of claims 1 to 6, characterized in that: Also includes: A second controlled switch, one end of the second controlled switch is connected to the output end of the operational amplifier circuit, and the other end is connected to the driving load of the muscle electric pulse signal output circuit.

8. An electrical device, characterized in that: include: A muscle electric pulse signal output circuit as described in any one of claims 1 to 7.

9. The electrical device according to claim 8, characterized in that: The electrical device is a beauty instrument.

10. A beauty instrument control method, characterized in that: The beauty instrument includes a muscle electric pulse signal output circuit, and the muscle electric pulse signal output circuit is the muscle electric pulse signal output circuit as claimed in claim 3, wherein the operational amplifier circuit includes: a fourth capacitor, an operational amplifier, a second power supply, a sixth resistor, a seventh resistor, a fifth capacitor, a sixth capacitor and a seventh capacitor; one end of the fourth capacitor is connected to the output end of the charge and discharge voltage divider circuit, and the other end is respectively connected to the positive electrode of the second power supply and the positive end of the operational amplifier; the reverse end of the operational amplifier is respectively connected to one end of the sixth resistor and the seventh resistor, the power supply end is connected to the positive electrode of the second power supply, and the negative electrode of the second power supply is grounded; the other end of the sixth resistor is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded; the other end of the seventh resistor is respectively connected to one end of the sixth capacitor and one end of the seventh capacitor, the other end of the sixth capacitor is grounded, and the other end of the seventh capacitor outputs the muscle electric pulse signal of the preset frequency; the method includes: Get the current gear signal after the beauty instrument is turned on; outputting a corresponding enable control signal to the other end of the fourth resistor based on the current gear position signal; Controlling the first power supply and the second power supply to supply power, and controlling the first controlled switch to be disconnected, so that the beauty instrument operates for a first preset time; After the beauty instrument runs for a first preset time, controlling the first power supply and the second power supply to stop supplying power, and controlling the beauty instrument to run for a second preset time; After the beauty instrument runs for a second preset time, the first power supply and the second power supply are controlled to resume power supply, the first controlled switch is controlled to close, and the beauty instrument is controlled to run for a third preset time.

11. The method according to claim 10, characterized in that After the beauty device runs for a third preset time, the method further includes: Re-execute the steps of controlling the first power supply and the second power supply to supply power, and controlling the first controlled switch to disconnect, so that the beauty instrument runs for a first preset time length, until the beauty instrument runs for a third preset time length for a preset number of times, control the first power supply and the second power supply to stop supplying power, and control the first controlled switch to disconnect.

12. The method according to claim 10, characterized in that The outputting a corresponding enable control signal to the other end of the fourth resistor based on the current gear position signal includes: When the current gear position signal corresponds to a high gear position, the corresponding enable control signal output to the other end of the fourth resistor is a high level signal; When the current gear position signal corresponds to a low gear position, the corresponding enable control signal output to the other end of the fourth resistor is a low level signal.

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