A control system for a skin improvement device

Abstract

The utility model discloses a kind of control systems of skin improvement equipment, it is related to skin improvement technical field, including main control unit, output interface CN6, first output bridge circuit, second output bridge circuit and current detection circuit;The negative end of first output bridge circuit and the negative end of second output bridge circuit are electrically connected to form negative end common contact point;The detection end IN+ of current detection circuit is electrically connected with negative end common contact point, and the output end of current detection circuit is electrically connected with the signal end CURR ADC of main control unit;Through the setting of negative end common contact point, current detection circuit can convert the current flowing on different potential into independent relative voltage characteristic of output end, which also simplifies the processing difficulty of analog-digital processing at different times, and also solves the measurement error caused by different loop;On hardware, only need to set a circuit detection circuit, can effectively reduce the amount of hardware, so that the volume of equipment can be relatively reduced, and equipment cost can be correspondingly reduced.

Description

Technical Field

[0001] This utility model relates to the field of skin improvement technology, and in particular to a control system for a skin improvement device. Background Technology

[0002] Chinese utility model patent CN211273154U discloses an electro-wave infusion device for introducing facial mask essence into the skin. Through the physical action of combining the electro-wave infusion device with the facial mask, it achieves effects such as promoting the efficiency of essence infusion into the skin, increasing skin moisture retention, and stimulating collagen production through electro-wave stimulation.

[0003] Because the load is connected to a human body, a current exceeding 10mA will pose a danger to the user; therefore, current detection is necessary to determine the current usage situation.

[0004] However, since the general design involves connecting detection circuits to both ends of the bridge, the cost is relatively high and the hardware usage is relatively large, which is not conducive to the miniaturization design of the product. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution to address the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a control system for a skin improvement device, comprising a main control unit, an output interface CN6, a first output bridge circuit, a second output bridge circuit, and a current detection circuit;

[0007] The positive pulse control terminal PM2 of the main control unit is electrically connected to the signal terminal of the first output bridge circuit, and the output terminal of the first output bridge circuit is electrically connected to the output terminal Out2 of the output interface CN6.

[0008] The positive pulse control terminal PM1 of the main control unit is electrically connected to the signal terminal of the second output bridge circuit, and the output terminal of the first output bridge circuit is electrically connected to the output terminal Out1 of the output interface CN6.

[0009] The negative terminal of the first output bridge circuit is electrically connected to the negative terminal of the second output bridge circuit to form a common negative terminal connection point.

[0010] The current detection circuit's detection terminal IN+ and negative terminal are electrically connected at a common connection point, and the output terminal of the current detection circuit is electrically connected to the main control unit's signal terminal CURR ADC.

[0011] A further technical solution of this utility model: The current detection circuit includes a detection chip U3, a resistor R14, and a resistor R39;

[0012] The IN+ terminal and the negative terminal of the detection chip U3 are electrically connected to the common contact point, and the IN- terminal of the detection chip U3 is electrically connected to the common contact point of the negative terminal through resistor R14;

[0013] The OUT terminal of the detection chip U3 is electrically connected to the negative terminal through resistor R39.

[0014] A further technical solution of this utility model: the detection chip U3 is model number 1NA181A3.

[0015] A further technical solution of this utility model: the current detection circuit also includes a filter circuit;

[0016] The filter circuit includes inductor C22, resistor R40 and inductor R20. The output terminal OUT of the detection chip U3 is electrically connected to the signal terminal CURR ADC of the main control unit through resistor R40.

[0017] One end of inductor C22 is electrically connected to one end of resistor R40, and the other end of inductor C22 is grounded; one end of inductor C20 is electrically connected to the other end of resistor R40, and the other end of inductor C20 is grounded.

[0018] A further technical solution of this utility model: the control system also includes an output load matching circuit;

[0019] The output load matching circuit includes a resistive load R47. One end of the resistive load R47 is electrically connected to the output terminal Out2 of the output interface CN6, and the other end of the resistive load R47 is electrically connected to the output terminal Out1 of the output interface CN6.

[0020] A further technical solution of this utility model includes a boost circuit, which comprises a boost control chip U2, an integral circuit, and a feedback circuit.

[0021] A further technical solution of this utility model: the boost control chip U2 is model AP3012.

[0022] A further technical solution of this utility model: The integrating circuit includes a resistor R36 and a capacitor C19;

[0023] The FB terminal of the boost control chip U2 is connected to one end of resistor R36 through resistor R12, and the other end of resistor R36 is connected to the control terminal PWM of the main control unit.

[0024] One end of capacitor C19 is connected to the common voltage point of resistors R12 and R36, and the other end of capacitor C19 is grounded.

[0025] A further technical solution of this utility model: the boost circuit also includes a PMOS switch Q11;

[0026] The drain (D) of PMOS switch Q11 is electrically connected to the SHDN terminal of boost control chip U2, and the gate (G) of PMOS switch Q11 is electrically connected to the control terminal / PumpEN of the main control unit.

[0027] A further technical solution of this utility model includes an output protection circuit;

[0028] The output protection circuit includes a resistive load R10. The control terminal SW of the boost control chip U2 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to one end of the resistive load R10. The other end of the resistive load R10 is electrically connected to the input terminals of the second output bridge circuit and the first output bridge circuit.

[0029] Compared with the prior art, the beneficial effects of this technical solution are: by setting the negative terminal common contact point as described above, the current detection circuit can convert the current flowing through different potentials into independent relative voltage characteristics of the output terminal. This simplifies the processing difficulty of different electrical systems when converting analog to digital, and also solves the measurement error caused by different circuits.

[0030] In terms of hardware, only one circuit detection circuit needs to be set up, which can effectively reduce the amount of hardware used, thereby reducing the size of the device and correspondingly reducing the cost of the device.

[0031] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

[0033] Figure 1 This is the circuit schematic diagram of this utility model;

[0034] Figure 2 This is the circuit schematic diagram of the main control unit of this utility model;

[0035] Figure 3 This is a circuit diagram of the boost circuit and output protection circuit of this utility model;

[0036] Figure 4 The circuit diagram shows the output interface CN6, the first output bridge circuit, the second output bridge circuit, the current detection circuit, and the output load matching circuit of this utility model. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Please see Figure 1-4 A control system for a skin improvement device includes a main control unit, an output interface CN6, a first output bridge circuit, a second output bridge circuit, and a current detection circuit.

[0039] The positive pulse control terminal PM2 of the main control unit is electrically connected to the signal terminal of the first output bridge circuit, and the output terminal of the first output bridge circuit is electrically connected to the output terminal Out2 of the output interface CN6.

[0040] The positive pulse control terminal PM1 of the main control unit is electrically connected to the signal terminal of the second output bridge circuit, and the output terminal of the first output bridge circuit is electrically connected to the output terminal Out1 of the output interface CN6.

[0041] The negative terminal of the first output bridge circuit is electrically connected to the negative terminal of the second output bridge circuit to form a common negative terminal connection point.

[0042] The current detection circuit's detection terminal IN+ and negative terminal are electrically connected at a common connection point, and the output terminal of the current detection circuit is electrically connected to the main control unit's signal terminal CURR ADC.

[0043] In some embodiments, the current detection circuit includes a detection chip U3 of model number 1NA181A3.

[0044] The IN+ terminal and the negative terminal of the detection chip U3 are electrically connected at a common contact point. The IN- terminal of the detection chip U3 is electrically connected to the negative terminal at a common contact point through resistor R14. The current flowing through resistor R14 generates a voltage drop, which is then converted into a voltage output by the detection chip U3.

[0045] By setting the negative terminal common contact point as described above, the detection chip U3 can convert the current flowing through different potentials into independent relative voltage characteristics at the output terminal. This simplifies the processing difficulty of handling different electrical systems when converting from analog to digital, and also solves the measurement error caused by different circuits.

[0046] In terms of hardware, only one circuit detection circuit needs to be set up, which can effectively reduce the amount of hardware used, thereby reducing the size of the device and correspondingly reducing the cost of the device.

[0047] In some embodiments, the OUT terminal of the detection chip U3 is electrically connected to the negative terminal via resistor R39 through a common contact point.

[0048] In some embodiments, the current detection circuit further includes a filter circuit, which includes an inductor C22, a resistor R40 and an inductor R20. The output terminal OUT of the detection chip U3 is electrically connected to the signal terminal CURR ADC of the main control unit through the resistor R40.

[0049] One end of inductor C22 is electrically connected to one end of resistor R40, and the other end of inductor C22 is grounded. One end of inductor C20 is electrically connected to the other end of resistor R40, and the other end of inductor C20 is grounded.

[0050] Inductor C22, resistor R40, and inductor R20 form a π-type filter circuit, providing a relatively stable signal for the main control unit to perform ADC conversion.

[0051] In some embodiments, the first output bridge circuit includes resistors R23 and R24, transistor Q8, resistors R18 and R45, transistor Q5, diode D5, MOSFET switch Q13, resistors R22 and R44, and the base of transistor Q8 is electrically connected to the positive pulse control terminal PM2 of the main control unit through resistor R23.

[0052] The second output bridge circuit includes resistors R25 and R26, transistor Q8, resistors R17 and R46, transistor Q4, diode D3, MOSFET switch Q12, resistors R21 and R43. The base of transistor Q9 is electrically connected to the negative pulse control terminal PM1 of the main control unit through resistor R25.

[0053] The source of MOSFET switch Q12 is electrically connected to the source of MOSFET switch Q13 to form the aforementioned negative terminal common connection point.

[0054] like Figure 4 As shown, MOSFET switches Q12 and Q13 are both N-channel MOSFET switches.

[0055] In some embodiments, the output interface CN6 is, for example, a PJ-234 type plug-in interface.

[0056] In some embodiments, the control system further includes an output load matching circuit, which includes a resistive load R47. One end of the resistive load R47 is electrically connected to the output terminal Out2 of the output interface CN6, and the other end of the resistive load R47 is electrically connected to the output terminal Out1 of the output interface CN6.

[0057] Since the output terminal is in contact with the human body, a relatively high output voltage will occur when there is no load. Adding a resistive load R47 can reduce the output voltage. When the output terminal is in contact with the human body, the output pulse energy only accumulates and has no release circuit. Therefore, the output load matching circuit can regulate the current of the loop.

[0058] When connected to the output interface CN6, the output load matching circuit uses only the resistive load R47 connected in parallel with the human body load to achieve the adjustment characteristic, which is equivalent to using the damping characteristic to perform a balancing operation with the load.

[0059] When the aforementioned bridge is energized, the resistive load R47 will not participate in the energy output. When the aforementioned bridge is de-energized, the resistive load R47 will release the output energy through the output terminals Out1 and Out2 of output interface CN6, ensuring that the output energy does not accumulate excessively.

[0060] In this embodiment, by setting the output load matching circuit, the output characteristics can be adjusted with fewer components involved, which is more conducive to cost reduction and product miniaturization design.

[0061] In some embodiments, the control system further includes a boost circuit, which comprises a boost control chip U2, an integrator circuit, and a feedback circuit. A fixed duty cycle is generated using PWM, and then a smoother voltage is produced through an RC integrator circuit.

[0062] The boost circuit integrates a basic integrator circuit and is paired with a constant boost control chip U2. The output voltage is adjusted through the feedback mechanism that affects the boost control chip.

[0063] In some embodiments, the boost control chip U2 is model AP3012.

[0064] In some embodiments, the integrating circuit includes a resistor R36 and a capacitor C19. The FB terminal of the boost control chip U2 is connected to one end of the resistor R36 through a resistor R12, and the other end of the resistor R36 is connected to the control terminal PWM of the main control unit; one end of the capacitor C19 is connected to the common voltage point of the resistor R12 and the resistor R36, and the other end of the capacitor C19 is grounded.

[0065] In some embodiments, the feedback circuit includes resistors R32 and R33.

[0066] In some embodiments, a set of PMOS switches Q11 is added at the front end of the boost circuit. These switches can be used to turn off the boost circuit operation; boost is enabled when / PumpEN is low and disabled when / PumpEN is high. Figure 3As shown, the drain (D) of PMOS switch Q11 is electrically connected to the SHDN terminal of boost control chip U2, and the gate (G) of PMOS switch Q11 is electrically connected to the control terminal / PumpEN of the main control unit.

[0067] In some embodiments, when the boosted voltage directly drives the load, an abnormal short circuit at the load end can cause the output voltage to drop and generate a large current, indirectly leading to power supply system malfunctions. Prolonged short circuits can cause overheating and burnout of the boost circuit, system reset, and rapid aging of the power supply battery. Therefore, the control system also includes an output protection circuit.

[0068] In some embodiments, the output protection circuit includes a resistive load R10. The control terminal SW of the boost control chip U2 is electrically connected to the anode of diode D1, the cathode of diode D1 is electrically connected to one end of the resistive load R10, and the other end of the resistive load R10 is electrically connected to the input terminals of the second output bridge circuit and the first output bridge circuit.

[0069] For example, the other end of the resistive load R10 is electrically connected to the emitter of transistor Q4, and the other end of the resistive load R10 is electrically connected to the emitter of transistor Q5.

[0070] Connect a resistive load R10 before connecting the load to limit the maximum output current.

[0071] In some embodiments, while satisfying the above-described functions, the device can be configured as a more portable wearable device, such as a wrist-worn device, thanks to the reduction in size.

[0072] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A control system for a skin improvement device, characterized in that, It includes a main control unit, output interface CN6, first output bridge circuit, second output bridge circuit and current detection circuit; The positive pulse control terminal PM2 of the main control unit is electrically connected to the signal terminal of the first output bridge circuit, and the output terminal of the first output bridge circuit is electrically connected to the output terminal Out2 of the output interface CN6. The positive pulse control terminal PM1 of the main control unit is electrically connected to the signal terminal of the second output bridge circuit, and the output terminal of the first output bridge circuit is electrically connected to the output terminal Out1 of the output interface CN6. The negative terminal of the first output bridge circuit is electrically connected to the negative terminal of the second output bridge circuit to form a common negative terminal connection point. The current detection circuit's detection terminal IN+ and negative terminal are electrically connected at a common connection point, and the output terminal of the current detection circuit is electrically connected to the main control unit's signal terminal CURR ADC.

2. The control system according to claim 1, characterized in that, The current detection circuit includes a detection chip U3, resistor R14, and resistor R39. The IN+ terminal and the negative terminal of the detection chip U3 are electrically connected to the common contact point, and the IN- terminal of the detection chip U3 is electrically connected to the common contact point of the negative terminal through resistor R14; The OUT terminal of the detection chip U3 is electrically connected to the negative terminal through resistor R39.

3. The control system according to claim 2, characterized in that, The detection chip U3 is model number 1NA181A3.

4. The control system according to claim 2, characterized in that, The current detection circuit also includes a filter circuit; The filter circuit includes inductor C22, resistor R40 and inductor R20. The output terminal OUT of the detection chip U3 is electrically connected to the signal terminal CURR ADC of the main control unit through resistor R40. One end of inductor C22 is electrically connected to one end of resistor R40, and the other end of inductor C22 is grounded; one end of inductor C20 is electrically connected to the other end of resistor R40, and the other end of inductor C20 is grounded.

5. The control system according to claim 1, characterized in that, The control system also includes an output load matching circuit; The output load matching circuit includes a resistive load R47. One end of the resistive load R47 is electrically connected to the output terminal Out2 of the output interface CN6, and the other end of the resistive load R47 is electrically connected to the output terminal Out1 of the output interface CN6.

6. The control system according to claim 1, characterized in that, It also includes a boost circuit, which consists of a boost control chip U2, an integrator circuit, and a feedback circuit.

7. The control system according to claim 6, characterized in that, The boost control chip U2 is model AP3012.

8. The control system according to claim 6, characterized in that, The integrating circuit includes resistor R36 and capacitor C19; The FB terminal of the boost control chip U2 is connected to one end of resistor R36 through resistor R12, and the other end of resistor R36 is connected to the control terminal PWM of the main control unit. One end of capacitor C19 is connected to the common voltage point of resistors R12 and R36, and the other end of capacitor C19 is grounded.

9. The control system according to claim 6, characterized in that, The boost circuit also includes a PMOS switch Q11; The drain (D) of PMOS switch Q11 is electrically connected to the SHDN terminal of boost control chip U2, and the gate (G) of PMOS switch Q11 is electrically connected to the control terminal / PumpEN of the main control unit.

10. The control system according to claim 6, characterized in that, It also includes output protection circuitry; The output protection circuit includes a resistive load R10. The control terminal SW of the boost control chip U2 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to one end of the resistive load R10. The other end of the resistive load R10 is electrically connected to the input terminals of the second output bridge circuit and the first output bridge circuit.

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