PWM control current output electrolysis water driving circuit

Abstract

The application provides a PWM control current output electrolytic water driving circuit, which comprises a working circuit, a power supply driving circuit and a PWM generating circuit; the power supply driving circuit is connected with the PWM generating circuit to input power supply; one end of the PWM generating circuit is connected with the working circuit; and the output end of the working circuit is connected with a load; the PWM generating circuit comprises a conversion circuit, a control circuit, a comparison circuit and an input circuit; the first end of the conversion circuit is connected with the working circuit; the second end of the conversion circuit is connected with the first end of the control circuit; the second end of the control circuit is connected with the first end of the comparison circuit; the second end of the comparison circuit is connected with the first end of the input circuit; and the second end of the input circuit is connected with the working circuit. The application has the advantages of long service life, high efficiency, small size, low cost and wide application range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, and particularly relates to a PWM control current output electrolysis water driving circuit. BACKGROUND

[0002] With the continuous progress of society, the demand for electrical equipment is also developing. At present, LED is more and more common in lighting applications, especially in machine vision systems, LED has become the most commonly used light source when shooting high-definition images. And LD laser has been widely used in optical fiber communication, laser fuse, laser radar, laser detection, laser guidance, industrial processing and other fields. In order to obtain high efficiency and high stability of LED light source or LD laser output, their common characteristics are to use constant current or constant current pulse for driving.

[0003] The prior art LED control controls the electrolysis water load current size through the 0-10V signal output voltage size, and needs to manually control the potentiometer. The control current is small and the operation is complicated. The service life is short, the efficiency is low, the volume is large, the cost is high, and therefore the use range is limited. SUMMARY

[0004] In view of the above related technical problems, the present application provides a PWM control current output electrolysis water driving circuit which has large control current, long service life, high efficiency and low cost.

[0005] In order to solve the above technical problems, the present application provides a PWM control current output electrolysis water driving circuit, which comprises: a working circuit, a power supply driving circuit and a PWM generating circuit; the power supply driving circuit is connected with the PWM generating circuit for input power supply, one end of the PWM generating circuit is connected with the working circuit, and the output end of the working circuit is connected with a load.

[0006] The PWM generating circuit comprises: a conversion circuit, a control circuit, a comparison circuit and an input circuit, the first end of the conversion circuit is connected with the working circuit, the second end of the conversion circuit is connected with the first end of the control circuit, the second end of the control circuit is connected with the first end of the comparison circuit, the second end of the comparison circuit is connected with the first end of the input circuit, and the second end of the input circuit is connected with the working circuit.

[0007] Preferably, the power supply driving circuit comprises a U1 chip, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode and a first inductor, the first resistor, the second resistor, the positive electrode of the first diode, the positive electrode of the second diode and the second capacitor are electrically connected to the U1 chip respectively, the first capacitor is connected in parallel to the first resistor, the first inductor is connected to VCC in series with the negative electrode of the first diode, and one end of the third capacitor is grounded.

[0008] Preferably, the working circuit comprises a plurality of capacitors connected in series, a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a light emitting diode, a second inductor, a third inductor and a plurality of resistors, the first field effect transistor is connected in parallel to the second field effect transistor, the drain electrode of the third field effect transistor is connected to an input Vin+, the source electrode of the third field effect transistor is connected to an input Vin-, the drain electrode of the fourth field effect transistor is connected to the input Vin+, the source electrode of the fourth field effect transistor is connected to the input Vin-, the second inductor and the third inductor are connected in parallel to the input Vin+, the positive electrode of the light emitting diode is connected to the end of the second inductor, the negative electrode of the light emitting diode is connected to the input Vin-, and one end of the input Vin- is connected to the first end of the conversion circuit.

[0009] Preferably, the conversion circuit comprises an IC3 chip, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a sliding resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fifth field effect transistor, a sixth field effect transistor, a fourth inductor and a terminal, the third resistor and the fourth capacitor are connected to the pins of the IC3 chip respectively, the fourth resistor is connected to one end of the fourth capacitor, the eighth resistor is connected in series with the fourth resistor, one end of the eighth resistor is connected to the collector electrode of the fifth field effect transistor, the fifth capacitor, the fifth resistor and the ninth resistor are connected in series, one end of the ninth resistor is connected to the collector electrode of the fifth field effect transistor, the base electrode of the fifth field effect transistor is connected between the collector electrode of the sixth field effect transistor and the seventh resistor, one end of the seventh resistor is connected to VCC, the base electrode of the sixth field effect transistor is connected between the sixth resistor and the tenth resistor, the emitter electrode of the fifth field effect transistor and the emitter electrode of the sixth field effect transistor are grounded respectively, the sixth resistor and the tenth resistor are connected to the fourth inductor respectively, and the other end of the fourth inductor is connected to the terminal.

[0010] Preferably, the model of the IC3 chip is SGM8551XN.

[0011] Preferably, the control circuit comprises: an IC1 chip, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor and a third diode connected to pins of the IC1 chip respectively, and a positive pole of the third diode is connected to the IC3 chip and a negative pole of the third diode is connected to the IC1 chip.

[0012] Preferably, the IC1 chip is of a model TL494BD / SO-16.

[0013] Preferably, the comparison circuit comprises: an IC2 chip, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twelfth capacitor and a thirteenth capacitor connected to pins of the IC2 chip respectively, one end of the twenty-third resistor is grounded, the twenty-first resistor is connected to one end of the control circuit and VCC, the twelfth capacitor and the thirteenth capacitor are connected in series, the twelfth capacitor and the thirteenth capacitor are grounded between them, and one end of the twelfth capacitor is connected to the input circuit.

[0014] Preferably, the IC2 chip is of a model LM393SO-8.

[0015] Preferably, the input circuit comprises: a U2, a twenty-fourth resistor, a twenty-fifth resistor and a fourteenth capacitor connected to pins of the U2 respectively.

[0016] Compared with the prior art, the power driving circuit is connected to the PWM generating circuit to input power, one end of the PWM generating circuit is connected to the working circuit, and an output end of the working circuit is connected to a load; the PWM generating circuit comprises: a conversion circuit, a control circuit, a comparison circuit and an input circuit, a first end of the conversion circuit is connected to the working circuit, a second end of the conversion circuit is connected to a first end of the control circuit, a second end of the control circuit is connected to a first end of the comparison circuit, a second end of the comparison circuit is connected to a first end of the input circuit, and a second end of the input circuit is connected to the working circuit; the control circuit controls the current to be large, has a long service life, high efficiency, small size, low cost and a wider use range. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other aspects of the present application will become more apparent and more readily appreciated by referring to the following detailed description of the application, taken in conjunction with the accompanying drawings. In the drawings:

[0018] Figure 1 It is a module diagram of the PWM control current output electrolytic water driving circuit of the present application.

[0019] Figure 2 The overall circuit diagram of the PWM control current output electrolysis water driving circuit of the present application;

[0020] Figure 3 The circuit diagram of the power supply driving circuit of the present application;

[0021] Figure 4 The circuit diagram of the working circuit of the present application;

[0022] Figure 5 The circuit diagram of the conversion circuit of the PWM generation circuit of the present application;

[0023] Figure 6 The circuit diagram of the control circuit of the PWM generation circuit of the present application;

[0024] Figure 7 The circuit diagram of the comparison circuit of the PWM generation circuit of the present application;

[0025] Figure 8 The circuit diagram of the input circuit of the PWM generation circuit of the present application.

[0026] In the figure, 100, PWM control current output electrolysis water driving circuit, 1, power supply driving circuit, 2, working circuit, 3, PWM generation circuit, 31, conversion circuit, 32, control circuit, 33, comparison circuit, 34, input circuit. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0028] The specific embodiments / examples described herein are specific embodiments of the present application, used to illustrate the concept of the present application, and are explanatory and exemplary, and should not be interpreted as limiting the embodiments of the present application and the scope of the present application. In addition to the examples described herein, those skilled in the art can also employ other technical solutions based on the disclosure of the claims and the specification of the present application, which include technical solutions that make any obvious substitutions and modifications to the examples described herein, and are within the scope of protection of the present application.

[0029] Please refer to Figures 1-8 , wherein, Figure 1 The module diagram of the PWM control current output electrolysis water driving circuit of the present application; Figure 2 The overall circuit diagram of the PWM control current output electrolysis water driving circuit of the present application;

[0030] Figure 3 The circuit diagram of the power supply driving circuit of the present application; Figure 4 The circuit diagram of the working circuit of the present application;Figure 5 Circuit diagram of a conversion circuit of the PWM generation circuit of the present application; Figure 6 Circuit diagram of a control circuit of the PWM generation circuit of the present application; Figure 7 Circuit diagram of a comparison circuit of the PWM generation circuit of the present application; Figure 8 Circuit diagram of an input circuit of the PWM generation circuit of the present application.

[0031] The embodiment of the present application provides a PWM control current output electrolytic water driving circuit 100, comprising a working circuit 2, a power supply driving circuit 1 and a PWM generation circuit 3; the power supply driving circuit 1 is connected with the PWM generation circuit 3 to input power supply, one end of the PWM generation circuit 3 is connected with the working circuit 2, and the output end of the working circuit 2 is connected with a load (LED+, LED-). The PWM generation circuit 3 comprises a conversion circuit 31, a control circuit 32, a comparison circuit 33 and an input circuit 34, the first end of the conversion circuit 31 is connected with the working circuit 2, the second end of the conversion circuit 31 is connected with the first end of the control circuit 32, the second end of the control circuit 32 is connected with the first end of the comparison circuit 33, the second end of the comparison circuit 33 is connected with the first end of the input circuit 34, and the second end of the input circuit 34 is connected with the working circuit 2.

[0032] Specifically, the power supply driving circuit 1 is used for connecting external power supply to supply power for the PWM generation circuit 3. The working circuit 2 is used for providing working voltage for an output load, and the PWM generation circuit 3 is used for generating PWM current, and the size of the PWM signal is controlled through the PWM generation circuit 3, so that the current is long in service life and high in efficiency.

[0033] Specifically, the conversion circuit 31 is used for converting a voltage signal through the input circuit 34 loop passing through a sampling resistor, and the voltage signal is input into an operational amplifier through a filter composed of a resistor and a capacitor, and then compared with a PWM signal at the negative input end of the operational amplifier. The control circuit 32 is used for providing a fixed frequency and a pulse width modulation convenient control circuit 32 for the voltage signal converted by the conversion circuit 31. The comparison circuit 33 is used for outputting a high pulse square wave signal output by the control circuit 32 to the input circuit 34 through a filter composed of a resistor and a capacitor after filtering. The input circuit 34 provides energy for the load.

[0034] Specifically, the power supply driving circuit 1 is connected with the PWM generating circuit 3 to input power, one end of the PWM is connected with the working circuit 2; the PWM generating circuit 3 comprises: a conversion circuit 31, a control circuit 32, a comparison circuit 33 and an input circuit 34, the first end of the conversion circuit 31 is connected with the working circuit 2, the second end of the conversion circuit 31 is connected with the first end of the control circuit 32, the second end of the control circuit 32 is connected with the first end of the comparison circuit 33, the second end of the comparison circuit 33 is connected with the first end of the input circuit 34, and the second end of the input circuit 34 is connected with a load; the control circuit 32 controls current, has long service life, high efficiency, small size, low cost and wide use range.

[0035] In the embodiment, the power supply driving circuit 1 comprises: a U1 chip, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C3, a third capacitor C4, a first diode D1, a second diode D2 and a first inductor L1, the first resistor R1, the second resistor R2, the positive pole of the first diode D1, the positive pole of the second diode D2 and the second capacitor C3 are electrically connected with the U1 chip respectively, the first capacitor C1 is connected in parallel with the first resistor R1, the first inductor L1 is connected with the negative pole of the first diode D1 in series and then connected with VCC, and one end of the third capacitor C4 is grounded.

[0036] Specifically, the U1 chip is a switching step-down DC-DC conversion chip, which provides VCC voltage for other IC working. The positive pole of the second diode D2 is an input Vin, the cathode of the second diode D2 is connected with the second capacitor C3 (electrolytic capacitor) for filtering and energy storage, and then input to the 1 pin of the U1 chip, the 3 and 6 pins of the U1 chip are connected with 0V, the 5 pin of the U1 chip is an enable pin, which works in low level and is closed in high level, so it is connected with 0V. The 4 pin of the U1 chip is a feedback pin of output voltage, which is connected with the first resistor R1 in parallel with the first capacitor C1 and the second resistor R2 to form a voltage dividing network, detects the output voltage for adjustment, the 2 pin of the U1 chip is connected with one end of the first inductor L1, the other end of the first inductor L1 is connected with the third capacitor C4 (electrolytic capacitor) for filtering and energy storage as the output end of VCC, the first diode D1 is a freewheeling diode, the first inductor L1 is a step-down inductor, and the negative poles of the second capacitor C3 and the third capacitor C4 are connected with 0V of the U1 ground.

[0037] In the embodiment, the working circuit 2 comprises a plurality of capacitors in series, a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a fourth field effect transistor Q4, a light emitting diode D3, a second inductor L3, a third inductor L4, and a plurality of resistors. The first field effect transistor Q1 and the second field effect transistor Q2 are connected in parallel. The drain of the third field effect transistor Q3 is connected to an input Vin+, and the source of the third field effect transistor Q3 is connected to an input Vin-. The drain of the fourth field effect transistor Q4 is connected to the input Vin+, and the source of the fourth field effect transistor Q4 is connected to the input Vin-. The second inductor L3 and the third inductor L4 are connected in parallel to the input Vin+. The anode of the light emitting diode D3 is connected to the end of the second inductor L3, and the cathode of the light emitting diode D3 is connected to the input Vin-. One end of the input Vin- is connected to the first end of the conversion circuit. One end of the working circuit is connected to LED+(PCB-24M4), and the other end is connected to LED-(PCB-24M4).

[0038] The plurality of capacitors comprise a capacitor EC1, a capacitor EC2, a capacitor EC3, a capacitor C26, a capacitor C28, a capacitor C8, a capacitor C22, a capacitor C24, a capacitor EC5, a capacitor EC6, a capacitor EC7, and a capacitor EC8. The plurality of resistors comprise a resistor R7, a resistor R3, a resistor R11, a resistor R13, a resistor R14, a resistor R32, and a resistor R12.

[0039] In the embodiment, the conversion circuit 31 comprises: an IC3 chip, a third resistor R18, a fourth resistor R34, a fifth resistor R26, a sixth resistor R33, a seventh resistor R28, an eighth resistor R29, a ninth resistor R27, a tenth resistor R35, a sliding resistor R4, a fourth capacitor C20, a fifth capacitor C19, a sixth capacitor C18, a fifth field effect transistor Q5, a sixth field effect transistor Q6, a fourth inductor L2, and a terminal, the third resistor R18 and the fourth capacitor C20 are connected to the pins of the IC3 chip, the fourth resistor R34 is connected with one end of the fourth capacitor C20, the eighth resistor is connected with the fourth resistor R34 in series, one end of the eighth resistor R29 is connected to the collector of the fifth field effect transistor Q5, the fifth capacitor C19, the fifth resistor R26, and the ninth resistor R27 are connected in series, one end of the ninth resistor R27 is connected to the collector of the fifth field effect transistor Q5, the base of the fifth field effect transistor Q5 is connected between the collector of the sixth field effect transistor Q6 and the seventh resistor R28, one end of the seventh resistor R28 is connected to VCC, the base of the sixth field effect transistor Q6 is connected between the sixth resistor R33 and the tenth resistor R35, the emitter of the fifth field effect transistor Q5 and the emitter of the sixth field effect transistor Q6 are grounded respectively, the sixth resistor R33 and the tenth resistor R35 are connected to the fourth inductor L2 respectively, the other end of the fourth inductor L2 is connected to the terminal C3.

[0040] Specifically, the IC3 chip is a rail-to-rail high-precision operational amplifier, the 5-pin is VCC, connected to the 14-pin 5V reference voltage output of the IC1 chip, the 2-pin is grounded to 0V, the 3-pin is the positive input terminal of the internal operational amplifier, inputs a signal, and is connected to the output negative end LED- of the sampling resistor in parallel connection of R14 and R32 through the filter composed of the third resistor R18 and the fourth capacitor C20, the other end of the parallel sampling resistor is the input negative end Vin-, the 4-pin is the negative input terminal of the internal operational amplifier, and the adjustable resistor is connected to the ground through the external sliding resistor R4, the size of the output current is controlled by the size of the sliding resistor R4, the external fifth resistor R26 inputs the PWM signal to control the output current, the PWM signal is input to the 4-pin operational amplifier negative and the 3-pin operational amplifier positive for comparison, and a rail-to-rail signal is output from the 1-pin output end of the operational amplifier to the feedback 3-pin of the IC1 through D4.

[0041] The logic function of IC3: the output current loop passes through a sampling resistor, and is converted into a voltage signal which is input into the positive input terminal of an operational amplifier through a filter composed of a third resistor R18 and a fourth capacitor C20. A signal at the positive input terminal of the operational amplifier is compared with a PWM signal at the negative input terminal of the operational amplifier, and a signal which is opposite to the signal at the negative input terminal of the operational amplifier is output from the output terminal of the operational amplifier to the pin 3 of IC1. When the signal at the positive input terminal of the operational amplifier rises, the signal at the negative input terminal of the operational amplifier is low. When the signal at the positive input terminal of the operational amplifier falls, the signal at the negative input terminal of the operational amplifier is high. The fifth capacitor C19 is a network compensation for the output terminal.

[0042] The external PWM signal is input through the C3 terminal, filtered through a common-mode inductor L2, and output to a voltage dividing circuit composed of a sixth resistor R33 and a tenth resistor R35 to control the base of a sixth field effect transistor Q6. The emitter of the sixth field effect transistor Q6 is connected to ground 0V. The collector of the sixth field effect transistor Q6 is connected to VCC through a seventh resistor R28. The collector output signal of the sixth field effect transistor Q6 is opposite to the base signal of the sixth field effect transistor Q6, and is output to the base of a fifth field effect transistor Q5. The emitter of the fifth field effect transistor Q5 is connected to ground 0V. The collector of the fifth field effect transistor Q5 is connected to a reference voltage 5V through an eighth resistor R29. The collector output signal of the fifth field effect transistor Q5 is opposite to the base signal of the fifth field effect transistor Q5. Therefore, the collector output signal of the fifth field effect transistor Q5 is consistent with the PWM signal. The collector output signal of the fifth field effect transistor Q5 is connected to the fifth resistor R26 through the ninth resistor R27, and then to the pin 4 of IC3. The sixth capacitor C18 connected between the ninth resistor R27 and the fifth resistor R26 is a filter capacitor. The collector signal of the fifth field effect transistor Q5 is input into the pin 4 of IC3 through the ninth resistor R27, the fifth resistor R26 and the sixth capacitor C18.

[0043] The logic function of PWM: the PWM signal is input into the base of the fifth field effect transistor Q5 through the collector output signal of the sixth field effect transistor Q6 which is opposite to the base signal of the fifth field effect transistor Q5. The collector of the fifth field effect transistor Q5 outputs a signal which is opposite to the base signal of the fifth field effect transistor Q5 and is input into the PWM signal twice, and becomes a positive signal. Finally, the collector output signal of the fifth field effect transistor Q5 is consistent with the input PWM signal. The collector output signal of the fifth field effect transistor Q5 is input into the negative input terminal of the operational amplifier of IC3 through the ninth resistor R27, the fifth resistor R26 and the slide resistor R4. The greater the resistance of the slide resistor R4, the greater the input signal of the negative input terminal, and the greater the output current of the load. The smaller the resistance of the slide resistor R4, the smaller the input signal of the negative input terminal, and the smaller the output current of the load.

[0044] In the embodiment, the model of the IC3 chip is SGM8551XN.

[0045] In the embodiment, the control circuit 32 comprises: an IC1 chip, an eleventh resistor R25, a twelfth resistor R20, a thirteenth resistor R21, a fourteenth resistor R36, a fifteenth resistor RT1, a sixteenth resistor R31, a seventeenth resistor R19, an eighteenth resistor R23, a sixth capacitor C17, a seventh capacitor C2, an eighth capacitor C12, a ninth capacitor C13, a tenth capacitor C14, an eleventh capacitor C16 and a third diode D4 connected to pins of the IC1 chip respectively, wherein a positive pole of the third diode D4 is connected to the IC3 chip and a negative pole of the third diode D4 is connected to the IC1 chip.

[0046] Specifically, the IC1 is a fixed frequency, pulse width modulation control circuit. The twelfth pin is a VCC input, the ninth capacitor C13 is connected as a filter capacitor, the eighth and eleventh pins are IC internal BJT collector inputs connected to the VCC pin, the seventh pin is a GMD connected to ground 0V, the fifth and sixth pins are connected to the eleventh capacitor C16. The sixteenth resistor R31 is used to set the oscillator frequency, the fourth pin is connected to C2, the fourteenth resistor R36 is a dead zone control comparator input, the third pin is a feedback input, the fourteenth pin is an IC internal output of a 5V reference voltage source, the eighth capacitor C12 is connected as a filter capacitor, the first pin is a non-inverting input of error amplifier 1 connected to ground, the second pin is an inverting input to error amplifier 1, the sixth capacitor C17 is connected as a filter capacitor to the 5V reference voltage source, the sixteenth pin is a non-inverting input of error amplifier 2, the twelfth resistor R20 and the eleventh resistor R25 are connected, the fifteenth pin is an inverting input to error amplifier 2, the thirteenth resistor R21 and the fifteenth resistor RT1 are connected, the thirteenth pin selects single-ended / parallel output or push pulse operation. Ground, the ninth and tenth pins are IC internal BJT emitter outputs, the eighteenth resistor R23 is connected, the seventeenth resistor R19 and the tenth capacitor C14 form a filter to output a pulse square wave signal.

[0047] The logic function of IC1: 2-pin amplifier 1 negative input 5V, 1-pin amplifier 1 positive input 0V, negative greater than positive, amplifier 1 output low is connected to the IC internal PWM comparator positive input through internal diode isolation, 15-pin amplifier 2 negative input 3.8V (divided through the thirteenth resistor R21 and the fifteenth resistor RT1), 16-pin amplifier 2 positive input 2.5V (divided through the twelfth resistor R20 and the eleventh resistor R25), negative greater than positive, amplifier 2 output low is connected to the IC internal PWM comparator positive input, here, the amplifier 1 and the amplifier 2 always maintain output low, which has no effect and is not concerned, the signal of IC3 is input to the feedback pin through the reverse isolation of D4, the feedback pin is connected to the IC internal PWM comparator positive input, the external sixteenth resistor R31 and the eleventh capacitor C16 (external frequency setting) of the IC internal oscillator are connected to generate a high-frequency triangular wave signal output to the IC internal PWM comparator negative input and the signal of the comparator positive input, and the comparator output high-frequency signal is output to the BJT emitter through the internal circuit to output a fixed frequency, pulse width square wave.

[0048] In the embodiment, the model of the IC1 chip is TL494BD / SO-16.

[0049] In the embodiment, the comparison circuit 33 comprises an IC2 chip, a nineteenth resistor R15, a twentieth resistor R16, a twenty-first resistor R17, a twenty-second resistor R22, a twenty-third resistor R24, a twelfth capacitor C11 and a thirteenth capacitor C15 connected to the pins of the IC2 chip respectively, one end of the twenty-third resistor R24 is grounded, one end of the twenty-first resistor R17 is connected to VCC and the control circuit, the twelfth capacitor C11 and the thirteenth capacitor C15 are connected in series, the twelfth capacitor C11 and the thirteenth capacitor C15 are grounded, and one end of the twelfth capacitor C11 is connected to the input circuit.

[0050] Specifically, the IC2 is a double comparator, the eighth pin is VCC input, the thirteenth capacitor C15 is connected as a filter capacitor, the fourth pin is grounded to 0V, the third pin is the positive input of comparator 1 connected to the input signal of point C, the sixth pin is the negative input of comparator 2 connected to the input signal of point C, the second pin is the negative input of comparator 1, VCC is divided through the twentieth resistor R17, the twenty-second resistor R22 and the twenty-third resistor R24 to input a signal of 2 / 3VCC to the second pin, the first pin is the output of comparator 1, the nineteenth resistor R15 is connected as a pull-up resistor, the fifth pin is the positive input of comparator 2 connected to the signal of 1 / 3VCC input through the twenty-second resistor R22 and the twenty-third resistor R24, and the seventh pin is the output of comparator 2 connected to the twentieth resistor R16 as a pull-up resistor.

[0051] The logic function of IC2: the high-frequency pulse square wave signal outputted by IC1 passes through the filter composed of the seventeenth resistor R19 and the tenth capacitor C14, and is filtered to the positive input of the comparator 1 at pin 3 and the negative input of the comparator 2 at pin 6, the negative input of the comparator 1 is 1 / 3 (the voltage divided by R17, R22 and R24) of VCC, the positive input of the comparator 1 is higher than the negative input, Drv1 outputs high, the positive input of the comparator 1 is lower than the negative input, Drv1 outputs low, the positive input of the comparator 2 is 1 / 3 (the voltage divided by R17, R22 and R24) of VCC, the positive input of the comparator 2 is higher than the negative input, Drv2 outputs high, the positive input of the comparator 2 is lower than the negative input, Drv2 outputs low, therefore, when the high-frequency pulse square wave signal input is high, Drv1 outputs high and Drv2 outputs low, and when the high-frequency pulse square wave signal input is low, Drv1 outputs low and Drv2 outputs high.

[0052] In the embodiment, the model of the IC2 chip is LM393SO-8.

[0053] In the embodiment, the input circuit 34 comprises U2, the twenty-fourth resistor R8 and the fifteenth capacitor C10 connected to the pins of U2 respectively. U2 is a high-frequency, 100V half-bridge N-channel power MOSFET driver, the pin 1 is the VCC input, the twelfth capacitor C11 is externally connected as a filter capacitor, the pin 7 is connected to 0V as IC ground, the pin 6 is the control signal input of the low-side driver, the pin 5 is the control signal input of the floating driver, the pin 4 is the exchange node, connected to D point, the pin 2 is the positive power supply of the internal floating high-side MOSFET driver, a bypass fifteenth capacitor C10 is connected between the pin 2 and the pin 4, the pin 3 is the floating drive output, the twenty-fifth resistor R5 is externally connected as a current-limiting drive resistor to A point, and the pin 8 is the low-side drive output, the twenty-fourth resistor R8 is externally connected as a current-limiting drive resistor to B point.

[0054] The logic function of U2: when Drv1 input is high and Drv2 input is low, A point output is high, the first field effect tube Q1 and the second field effect tube Q2 are turned on to charge the second inductor L3, the third inductor L4 and the electrolytic capacitors EC5, EC6, EC7 and EC8, and at the same time, energy is provided to the load, B point output is low, the third field effect tube Q3 and the fourth field effect tube Q4 are turned off. When Drv1 input is low and Drv2 input is high, A point output is low, the first field effect tube Q1 and the second field effect tube Q2 are turned off, B point output is high, the third field effect tube Q3 and the fourth field effect tube Q4 are turned on to discharge the second inductor L3, the third inductor L4 and the electrolytic capacitors EC5, EC6, EC7 and EC8, and at the same time, energy is provided to the load (LED+, LED-).

[0055] Optionally, the model of U2 is MP18021 chip.

[0056] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, and improvement made in the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A PWM-controlled current output electrolysis water drive circuit, characterized in that, It includes: a working circuit, a power drive circuit, and a PWM generation circuit; the power drive circuit is connected to the PWM generation circuit for inputting power, one end of the PWM generation circuit is connected to the working circuit, and the output end of the working circuit is connected to the load. The PWM generation circuit includes a conversion circuit, a control circuit, a comparison circuit, and an input circuit. The first terminal of the conversion circuit is connected to the working circuit, the second terminal of the conversion circuit is connected to the first terminal of the control circuit, the second terminal of the control circuit is connected to the first terminal of the comparison circuit, the second terminal of the comparison circuit is connected to the first terminal of the input circuit, and the second terminal of the input circuit is connected to the working circuit. The conversion circuit is used to convert the input circuit loop through a sampling resistor into a voltage signal, which is then filtered by a resistor and capacitor and input to the positive input terminal of the transport amplifier circuit for comparison with the PWM signal at the negative input terminal of the operational amplifier. The control circuit is used to provide the voltage signal converted by the conversion circuit with a fixed frequency and convenient pulse width modulation. The comparison circuit is used to filter the high-pulse square wave signal output by the control circuit through a resistor and capacitor and output it to the input circuit, so as to provide energy to the load through the input circuit.

2. The PWM-controlled current output electrolysis water drive circuit as described in claim 1, characterized in that, The power drive circuit includes: a U1 chip, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, and a first inductor. The first resistor, the second resistor, the anode of the first diode, the anode of the second diode, and the second capacitor are electrically connected to the U1 chip. The first capacitor is connected in parallel with the first resistor. The first inductor is connected in series with the cathode of the first diode and then connected to VCC. One end of the third capacitor is grounded.

3. The PWM-controlled current output electrolysis water drive circuit as described in claim 1, characterized in that, The operating circuit includes: multiple capacitors connected in series, a first field-effect transistor (FET), a second FET, a third FET, a fourth FET, a light-emitting diode (LED), a second inductor, a third inductor, and multiple resistors. The first FET and the second FET are connected in parallel. The drain of the third FET is connected to the input Vin+, and the source of the third FET is connected to the input Vin-. The drain of the fourth FET is connected to the input Vin+, and the source of the fourth FET is connected to the input Vin-. The second inductor and the third inductor are connected in parallel to the input Vin+. The anode of the LED is connected to the end of the second inductor, and the cathode of the LED is connected to the input Vin-. One end of the input Vin- is connected to the first terminal of the conversion circuit.

4. The PWM-controlled current output electrolysis water drive circuit as described in claim 1, characterized in that, The conversion circuit includes: an IC3 chip, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a sliding resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fifth field-effect transistor (FET), a sixth FET, a fourth inductor, and terminals. The third resistor and the fourth capacitor are respectively connected to the pins of the IC3 chip. One end of the fourth resistor is connected to the fourth capacitor. The eighth resistor is connected in series with the fourth resistor. One end of the eighth resistor is connected to the collector of the fifth FET. The fifth capacitor, the fifth resistor, and the ninth resistor are connected in series. One end of the ninth resistor is connected to the collector of the fifth FET. The base of the fifth FET is connected between the collector of the sixth FET and the seventh resistor. One end of the seventh resistor is connected to VCC. The base of the sixth FET is connected between the sixth resistor and the tenth resistor. The emitters of the fifth and sixth FETs are respectively grounded. The sixth resistor and the tenth resistor are respectively connected to the fourth inductor. The other end of the fourth inductor is connected to the terminals.

5. The PWM-controlled current output electrolysis water drive circuit as described in claim 4, characterized in that, The IC3 chip is model SGM8551XN.

6. The PWM-controlled current output electrolysis water drive circuit as described in claim 4, characterized in that, The control circuit includes: an IC1 chip, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth resistors, a sixth, seventh, eighth, ninth, tenth, and eleventh capacitors, and a third diode, all connected to the pins of the IC1 chip. The anode of the third diode is connected to the IC3 chip, and the cathode of the third diode is connected to the IC1 chip.

7. The PWM-controlled current output electrolysis water drive circuit as described in claim 6, characterized in that, The IC1 chip is model number TL494BD / SO-16.

8. The PWM-controlled current output electrolysis water drive circuit as described in claim 1, characterized in that, The comparator circuit includes: an IC2 chip, and nineteenth, twentieth, twenty-first, twenty-second, and twenty-third resistors, a twelfth capacitor, and a thirteenth capacitor respectively connected to the pins of the IC2 chip. One end of the twelfth resistor is grounded, the twelfth resistor is connected to one end of the control circuit and connected to VCC, the twelfth capacitor and the thirteenth capacitor are connected in series, and the twelfth capacitor and the thirteenth capacitor are grounded. One end of the twelfth capacitor is connected to the input circuit.

9. The PWM-controlled current output electrolysis water drive circuit as described in claim 8, characterized in that, The IC2 chip is model LM393SO-8.

10. The PWM-controlled current output electrolysis water drive circuit as described in claim 8, characterized in that, The input circuit includes: U2, a 24th resistor, a 25th resistor, and a 14th capacitor, which are respectively connected to the pins of U2.

Images