High-efficiency energy-saving low-power direct-current dual-motor driving device

Abstract

A high-efficiency energy-saving low-power direct-current dual-motor driving device comprises a motor driving main circuit, a buffer amplification circuit used for buffering and amplifying four paths of pulse width modulation (PWM) signals, an auxiliary power supply circuit used for providing reference voltage for the motor driving main circuit and supplying power to the buffer amplification circuit, and a power supply switch circuit used for reducing switch ignition loss. The motor driving main circuit is connected with the power switch circuit, the auxiliary power circuit, the buffer amplification circuit and a motor signal output end, the buffer amplification circuit is connected with the auxiliary power circuit and a four-way PWM signal input end of the MCU, and the auxiliary power circuit is connected with the power switch circuit. And the power switch circuit is connected with the input end of the 5VDC to 30VDC. According to the utility model, high-efficiency driving of the low-power DC motor is realized, the stability and reliability of the system are enhanced by adopting the buffer amplification circuit, and the energy consumption of the device is reduced and the driving efficiency is improved by adopting the power switch circuit and the low-power-consumption driving chip.

Description

Technical Field

[0001] The utility model relates to the technical field of motor drive devices, in particular to a high-efficiency, energy-saving, low-power DC dual-motor drive device. Background Art

[0002] With the development of power electronics technology, microelectronics technology and modern control theory, low-power DC motors have been widely used in people's daily lives, such as household appliances, power tools, vending machines and other scenarios. Traditional brushed DC motors usually use mechanical structures to control the direction and speed of the motor, which not only increases the cost, but also brings more additional losses. With the advancement of motor control technology, numerical control technology that controls brushed DC motors through software and hardware is developing rapidly and gradually replacing traditional mechanical control. However, most of the low-power brushed DC motor drive methods on the market have disadvantages such as low efficiency, difficult control, slow response, and high cost, which cannot meet the market demand for various consumer electronic products. Summary of the invention

[0003] In order to overcome the defects of the prior art, the utility model provides a high-efficiency and energy-saving low-power DC dual-motor driving device, which realizes the efficient driving of the low-power DC motor. At the same time, a buffer amplifier circuit is adopted to enhance the stability and reliability of the system. A power switch circuit and a low-power driving chip are adopted to reduce the energy consumption of the device and improve the driving efficiency.

[0004] The utility model solves the technical problem, and the technical solution adopted is:

[0005] A high-efficiency and energy-saving low-power DC dual-motor driving device comprises a motor driving main circuit, a buffer amplifier circuit for buffering and amplifying four-channel pulse width modulation (PWM) signals, an auxiliary power supply circuit for providing a reference voltage for the motor driving main circuit and powering the buffer amplifier circuit, and a power switch circuit for reducing switch sparking loss, wherein the motor driving main circuit is respectively connected to the power switch circuit, the auxiliary power supply circuit, the buffer amplifier circuit and the motor signal output terminal, the buffer amplifier circuit is respectively connected to the auxiliary power supply circuit and the four-channel PWM signal input terminal of a microcontroller MCU, the auxiliary power supply circuit is connected to the power switch circuit, and the power switch circuit is connected to a 5VDC-30VDC input terminal.

[0006] Further, the power switch circuit includes a first resistor, a first capacitor, a second capacitor, a third capacitor, a diode, a MOS tube, a switch and a power input interface, and the 5VDC-30VDC input end is connected to the power input interface;

[0007] One end of the first capacitor is respectively connected to the cathode of the diode, pin 1 of the switch and the source of the MOS tube, and is connected to pin 2 of the power input interface; the other end of the first capacitor is respectively connected to one end of the first resistor, the negative end of the second capacitor, one end of the third capacitor and pin 1 of the power input interface, and is connected to the ground terminal GND; the anode of the diode is respectively connected to pin 3 of the switch and the other end of the first resistor; pin 2 of the switch is connected to the gate of the MOS tube; the drain of the MOS tube is respectively connected to the positive end of the second capacitor and the other end of the third capacitor, and is led out as the power supply VBAT terminal.

[0008] Furthermore, the auxiliary power supply circuit includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first voltage stabilizing chip and a second voltage stabilizing chip;

[0009] One end of the fourth capacitor is connected to pin 1 of the first voltage regulator chip and to the power supply VBAT terminal, the other end of the fourth capacitor is respectively connected to pin 2 of the first voltage regulator chip and one end of the fifth capacitor, and is connected to the ground terminal GND, the other end of the fifth capacitor is connected to pin 3 of the first voltage regulator chip and is led out as the power supply VCC5V terminal, and pin 4 of the first voltage regulator chip is connected to the ground terminal GND; one end of the sixth capacitor is connected to pin 1 of the second voltage regulator chip and is connected to the power supply VBAT terminal, the other end of the sixth capacitor is respectively connected to pin 2 of the second voltage regulator chip and one end of the seventh capacitor, and is connected to the ground terminal GND, the other end of the seventh capacitor is connected to pin 3 of the second voltage regulator chip and is led out as the reference voltage VREF terminal, and pin 4 of the second voltage regulator chip is connected to the ground terminal GND.

[0010] Furthermore, the buffer amplifier circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, an eighth capacitor, a buffer driver chip and a signal input interface;

[0011] Pin 1 of the buffer driver chip is connected to pins 4, 7, 10 and 13 respectively, and is connected to the ground terminal GND, pin 2 of the buffer driver chip is connected to one end of the second resistor, and is connected to the signal input port PWM1, pin 3 of the buffer driver chip is led out as the PWM signal output port IN1, pin 5 of the buffer driver chip is connected to one end of the fourth resistor, and is connected to the signal input port PWM2, pin 6 of the buffer driver chip is led out as the PWM signal output port IN2, pin 8 of the buffer driver chip is led out as the PWM signal output port IN3, pin 9 of the buffer driver chip is connected to the fifth One end of the resistor is connected and connected to the signal input port PWM3, the 11th pin of the buffer driver chip is led out as the PWM signal output port IN4, the 12th pin of the buffer driver chip is connected to one end of the third resistor and connected to the signal input port PWM4, the 14th pin of the buffer driver chip is connected to the positive end of the eighth capacitor and connected to the power supply VCC5V terminal, the other end of the second resistor is connected to the other end of the fourth resistor and connected to the ground terminal GND, the other end of the third resistor is connected to the other end of the fifth resistor and connected to the ground terminal GND, and the negative end of the eighth capacitor is connected to the ground terminal GND.

[0012] Furthermore, the motor drive main circuit includes a first motor drive chip, a second motor drive chip, a sixth resistor, a seventh resistor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a first signal output interface, and a second signal output interface;

[0013] Pin 1 of the first motor driver chip is connected to the ground terminal GND, pin 2 of the first motor driver chip is connected to the PWM signal output port IN2, pin 3 of the first motor driver chip is connected to the PWM signal output port IN1, pin 4 of the first motor driver chip is connected to one end of the ninth capacitor and to the reference voltage VREF terminal, pin 5 of the first motor driver chip is respectively connected to one end of the tenth capacitor and the positive end of the eleventh capacitor, and to the power supply VBAT terminal, pin 6 of the first motor driver chip is led out as the signal output port OUT1, pin 7 of the first motor driver chip is connected to one end of the sixth resistor, pin 8 of the first motor driver chip is led out as the signal output port OUT2, pin 9 of the first motor driver chip is connected to the ground terminal GND, the other end of the ninth capacitor is connected to the ground terminal GND, the other end of the tenth capacitor is connected to the ground terminal GND, the negative end of the eleventh capacitor is connected to the ground terminal GND, and the other end of the sixth resistor is connected to the ground terminal GND. Pin 1 of the second motor driver chip is connected to the ground terminal GND, pin 2 of the second motor driver chip is connected to the PWM signal output port IN4, pin 3 of the second motor driver chip is connected to the PWM signal output port IN3, pin 4 of the second motor driver chip is connected to one end of the twelfth capacitor and to the reference voltage VREF terminal, pin 5 of the second motor driver chip is respectively connected to one end of the thirteenth capacitor and the positive end of the fourteenth capacitor, and is connected to the power supply VBAT terminal, pin 6 of the second motor driver chip is led out as the signal output port OUT3, pin 7 of the second motor driver chip is connected to one end of the seventh resistor, pin 8 of the second motor driver chip is led out as the signal output port OUT4, pin 9 of the second motor driver chip is connected to the ground terminal GND, the other end of the twelfth capacitor is connected to the ground terminal GND, the other end of the thirteenth capacitor is connected to the ground terminal GND, the negative end of the fourteenth capacitor is connected to the ground terminal GND, and the other end of the seventh resistor is connected to the ground terminal GND; signal output ports OUT1, OUT2, OUT3, and OUT4 are all connected to the motor signal output terminal.

[0014] The beneficial effects of the utility model are:

[0015] The utility model realizes 5VDC-30VDC wide voltage power supply, controls the direction and speed of the motor through four-way pulse width modulation PWM signals, has strong adaptability, simple control and fast response; adopts a power switch circuit to reduce the loss when the switch is ignited, and prevents excessive energy consumption caused by repeated switching; adopts an auxiliary power supply circuit to realize the power supply of the buffer amplifier circuit and the motor drive main circuit, wherein the first voltage regulator chip provides VCC5V power to the buffer drive chip, and the second voltage regulator chip provides the reference voltage VREF to the motor drive chip; adopts a buffer amplifier circuit to realize the buffering and amplification of the four-way PWM signal, when the motor drive signal is cut off, due to the inertia motor will continue to rotate, during the rotation period will generate an induced voltage, forming a current backflow, in order to prevent the current backflow from damaging the microcontroller MCU, a buffer drive chip is used to protect the MCU, and the chip also has the characteristics of low power consumption; the motor drive main circuit realizes efficient driving and energy saving of the motor, can drive a small power brush motor under a power supply voltage of 4.5V to 44V, and supports multiple power supply modes including USB power supply, battery power supply, etc., in addition, the chip can automatically enter the standby mode when the motor stops running, reduce energy consumption and extend the battery life of the battery-powered device;

[0016] Since, except for the power input interface U1, the PWM signal input interface U4, the motor signal output interfaces U8 and U9 and the switch SW1, the remaining components of the device are all packaged in surface mount form, the device is compact and easy to integrate with other circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the electrical structure of the utility model.

[0018] Figure 2 The utility model relates to a power switch circuit.

[0019] Figure 3 The utility model is an auxiliary power supply circuit.

[0020] Figure 4 The utility model relates to a buffer amplifier circuit.

[0021] Figure 5 The utility model is a main circuit for driving a motor.

[0022] Figure 6 This is an example diagram of the drive signal when OUT1 and OUT2 output the motor in forward rotation.

[0023] Figure 7 This is an example diagram of the drive signal when OUT1 and OUT2 output the motor in reverse rotation. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown, a high-efficiency and energy-saving low-power DC dual-motor driving device includes a motor driving main circuit, a buffer amplifier circuit for buffering and amplifying four-way pulse width modulation (PWM) signals, an auxiliary power supply circuit for providing a reference voltage for the motor driving main circuit and powering the buffer amplifier circuit, and a power switch circuit for reducing switch spark loss. The motor driving main circuit is respectively connected to the power switch circuit, the auxiliary power supply circuit, the buffer amplifier circuit and the motor signal output terminal, the buffer amplifier circuit is respectively connected to the auxiliary power supply circuit and the four-way PWM signal input terminal of the microcontroller MCU, the auxiliary power supply circuit is connected to the power switch circuit, and the power switch circuit is connected to the 5VDC-30VDC input terminal. The auxiliary power supply circuit and the motor drive main circuit are powered by the power switch circuit. The auxiliary power supply circuit provides reference voltages to the motor drive main circuits and powers the buffer amplifier circuits. The four PWM signals at the four PWM signal input ends of the microcontroller MCU are buffered and amplified. After being amplified by the motor drive main circuit, two PWM signals with strong driving capabilities are generated to control the speed and direction of the two DC motors respectively. The speed of the DC motor is controlled by changing the duty cycle of the input PWM signal, and the direction of the DC motor is controlled by switching the PWM signal input.

[0026] like Figure 2 As shown, the power switch circuit: the 5VDC-30VDC input end is connected to the power input interface U1, one end of the first capacitor C1 is respectively connected to the cathode of the diode D1, the 1st pin of the switch SW1 and the source of the MOS tube Q1, and is connected to the 2nd pin VCC of the power input interface U1, the other end of the first capacitor C1 is respectively connected to one end of the first resistor R1, the negative end of the second capacitor C2, one end of the third capacitor C3 and the 1st pin of the power input interface U1, and is connected to the ground terminal GND, the anode of the diode D1 is respectively connected to the 3rd pin of the switch SW1 and the other end of the first resistor R1, the 2nd pin of the switch SW1 is connected to the gate of the MOS tube Q1, the drain of the MOS tube Q1 is respectively connected to the positive end of the second capacitor C2 and the other end of the third capacitor C3, and is led out as the power VBAT end.

[0027] like Figure 3As shown, the auxiliary power supply circuit: one end of the fourth capacitor C4 is connected to the 1st pin of the first voltage stabilizing chip U2, and is connected to the power supply VBAT terminal, the other end of the fourth capacitor C4 is respectively connected to the 2nd pin of the first voltage stabilizing chip U2 and one end of the fifth capacitor C5, and is connected to the ground terminal GND, the other end of the fifth capacitor C5 is connected to the 3rd pin of the first voltage stabilizing chip U2, and is led out as the power supply VCC5V terminal, and the 4th pin of the first voltage stabilizing chip U2 is connected to the ground terminal GND. One end of the sixth capacitor C6 is connected to the 1st pin of the second voltage stabilizing chip U3, and is connected to the power supply VBAT terminal, the other end of the sixth capacitor C6 is respectively connected to the 2nd pin of the second voltage stabilizing chip U3 and one end of the seventh capacitor C7, and is connected to the ground terminal GND, the other end of the seventh capacitor C7 is connected to the 3rd pin of the second voltage stabilizing chip U3, and is led out as the reference voltage VREF terminal, and the 4th pin of the second voltage stabilizing chip U3 is connected to the ground terminal GND. The models of the first voltage stabilizing chip U2 and the second voltage stabilizing chip U3 are both LM2940S-5.0.

[0028] like Figure 4 As shown, the four-channel PWM signal input end of the microcontroller MCU includes a PWM signal input chip U4, and the pins 1, 5, 6 and 2 of the PWM signal input chip U4 are respectively connected to the signal input ports PWM1, PWM2, PWM3 and PWM4; the pins 3 and 4 of the PWM signal input chip U4 are both connected to the ground terminal GND.

[0029] The buffer amplifier circuit: Pin 1 of the buffer driver chip U5 is connected to Pin 4, Pin 7, Pin 10 and Pin 13 respectively, and is connected to the ground terminal GND; Pin 2 of the buffer driver chip U5 is connected to one end of the second resistor R2, and is connected to the signal input port PWM1; Pin 3 of the buffer driver chip U5 is led out as the PWM signal output port IN1; Pin 5 of the buffer driver chip U5 is connected to one end of the fourth resistor R4, and is connected to the signal input port PWM2; Pin 6 of the buffer driver chip U5 is led out as the PWM signal output port IN2; Pin 8 of the buffer driver chip U5 is led out as the PWM signal output port IN3; Pin 9 of the buffer driver chip U5 is connected to the PWM signal output port IN4; The buffer driver chip U5 is connected to one end of the fifth resistor R5 and is connected to the signal input port PWM3. The 11th pin of the buffer driver chip U5 is led out as the PWM signal output port IN4. The 12th pin of the buffer driver chip U5 is connected to one end of the third resistor R3 and is connected to the signal input port PWM4. The 14th pin of the buffer driver chip U5 is connected to the positive end of the eighth capacitor C8 and is connected to the power supply VCC5V. The other end of the second resistor R2 is connected to the other end of the fourth resistor R4 and is connected to the ground terminal GND. The other end of the third resistor R3 is connected to the other end of the fifth resistor R5 and is connected to the ground terminal GND. The negative end of the eighth capacitor C8 is connected to the ground terminal GND. The model of the buffer driver chip U5 is SN74HC125PWR.

[0030] like Figure 5 As shown, the motor driving main circuit: Pin 1 of the first motor driving chip U6 is connected to the ground terminal GND, Pin 2 of the first motor driving chip U6 is connected to the PWM signal output port IN2, Pin 3 of the first motor driving chip U6 is connected to the PWM signal output port IN1, Pin 4 of the first motor driving chip U6 is connected to one end of the ninth capacitor C9, and is connected to the reference voltage VREF end, Pin 5 of the first motor driving chip U6 is respectively connected to one end of the tenth capacitor C10 and the positive end of the eleventh capacitor C11, and is connected to the power supply VBAT end, Pin 6 of the first motor driving chip U6 is led out as the signal output port OUT1, Pin 7 of the first motor driving chip U6 is connected to one end of the sixth resistor R6, Pin 8 of the first motor driving chip U6 is led out as the signal output port OUT2, Pin 9 of the first motor driving chip U6 is connected to the ground terminal GND, the other end of the ninth capacitor C9 is connected to the ground terminal GND, the other end of the tenth capacitor C10 is connected to the ground terminal GND, the negative end of the eleventh capacitor C11 is connected to the ground terminal GND, and the other end of the sixth resistor R6 is connected to the ground terminal GND. Pin 1 of the second motor driver chip U7 is connected to the ground terminal GND, pin 2 of the second motor driver chip U7 is connected to the PWM signal output port IN4, pin 3 of the second motor driver chip U7 is connected to the PWM signal output port IN3, pin 4 of the second motor driver chip U7 is connected to one end of the twelfth capacitor C12, and is connected to the reference voltage VREF terminal, pin 5 of the second motor driver chip U7 is respectively connected to one end of the thirteenth capacitor C13 and the positive end of the fourteenth capacitor C14, and is connected to the power supply VBAT terminal, pin 6 of the second motor driver chip U7 is led out as the signal output port OUT3, pin 7 of the second motor driver chip U7 is connected to one end of the seventh resistor R7, pin 8 of the second motor driver chip U7 is led out as the signal output port OUT4, pin 9 of the second motor driver chip U7 is connected to the ground terminal GND, the other end of the twelfth capacitor C12 is connected to the ground terminal GND, the other end of the thirteenth capacitor C13 is connected to the ground terminal GND, the negative end of the fourteenth capacitor C14 is connected to the ground terminal GND, and the other end of the seventh resistor R7 is connected to the ground terminal GND. The first motor driver chip U6 and the second motor driver chip U7 are both TB67H450FNG. The motor signal output end includes two motor signal output interfaces, the 1st and 2nd pins of the motor signal output interface U8 are connected to the signal output ports OUT1 and OUT2 respectively, and the 1st and 2nd pins of the motor signal output interface U9 are connected to the signal output ports OUT3 and OUT4 respectively.

[0031] Take U8 as the motor drive signal output port as an example. Figure 6 This is an example of the motor drive signal waveform when the motor connected to U8 rotates forward. OUT1 outputs a PWM signal and OUT2 outputs a low level, then the motor rotates forward.

[0032] like Figure 7This is an example of the motor drive signal waveform when the motor connected to U8 reverses. OUT1 outputs a low level and OUT2 outputs a PWM signal, then the motor reverses.

[0033] The working process of the utility model is as follows:

[0034] Take 12V DC power supply as an example. When 12V DC is input, the auxiliary power supply circuit and the motor drive main circuit are powered through the power switch circuit. When the switch SW1 is thrown to the 1 side, the MOS tube is cut off and the power switch circuit stops supplying power; when the switch SW1 is thrown to the 3 side, the MOS tube is turned on and the power switch circuit supplies power normally. The auxiliary power supply circuit converts 12V DC into 5V DC through the first voltage regulator chip U2, and supplies it to the buffer driver chip U5. Then, the 12V DC is converted into 5V reference voltage VREF through the second voltage regulator chip U3, and supplies it to the two motor driver chips U6 and U7 respectively to set the maximum output current of the motor driver chip. When the four-way PWM signals input by the microcontroller MCU are buffered and amplified, and then amplified by the motor drive main circuit, two PWM signals with strong driving capabilities are generated to control the speed and direction of the two DC motors respectively. The speed of the DC motor is controlled by changing the duty cycle of the input PWM signal. If the duty cycle increases, the motor speed increases, and if the duty cycle decreases, the motor speed decreases. The direction of the DC motor is controlled by switching the PWM signal input. Taking the motor signal output interface U8 as the motor drive signal output port as an example, if OUT1 outputs a PWM signal and OUT2 outputs a low level, the motor rotates forward. If OUT1 outputs a low level and OUT2 outputs a PWM signal, the motor rotates reversely.

[0035] The motor drive device of the utility model has the advantages of small size, high efficiency, simple control, fast response, low cost and certain application value.

Claims

1. A high-efficiency, energy-saving, low-power DC dual-motor drive device, characterized in that: The device comprises a motor driving main circuit, a buffer amplifier circuit for buffering and amplifying four-way pulse width modulation (PWM) signals, an auxiliary power supply circuit for providing a reference voltage for the motor driving main circuit and powering the buffer amplifier circuit, and a power switch circuit for reducing switch sparking loss. The motor driving main circuit is respectively connected to the power switch circuit, the auxiliary power supply circuit, the buffer amplifier circuit and the motor signal output end, the buffer amplifier circuit is respectively connected to the auxiliary power supply circuit and the four-way PWM signal input end of the microcontroller MCU, the auxiliary power supply circuit is connected to the power switch circuit, and the power switch circuit is connected to the 5VDC-30VDC input end.

2. The high-efficiency, energy-saving, low-power DC dual-motor driving device according to claim 1, characterized in that: The power switch circuit includes a first resistor, a first capacitor, a second capacitor, a third capacitor, a diode, a MOS tube, a switch and a power input interface, and the 5VDC-30VDC input end is connected to the power input interface; One end of the first capacitor is respectively connected to the cathode of the diode, pin 1 of the switch and the source of the MOS tube, and is connected to pin 2 of the power input interface; the other end of the first capacitor is respectively connected to one end of the first resistor, the negative end of the second capacitor, one end of the third capacitor and pin 1 of the power input interface, and is connected to the ground terminal GND; the anode of the diode is respectively connected to pin 3 of the switch and the other end of the first resistor; pin 2 of the switch is connected to the gate of the MOS tube; the drain of the MOS tube is respectively connected to the positive end of the second capacitor and the other end of the third capacitor, and is led out as the power supply VBAT terminal.

3. The high-efficiency, energy-saving, low-power DC dual-motor driving device according to claim 2, characterized in that: The auxiliary power supply circuit includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first voltage stabilizing chip and a second voltage stabilizing chip; One end of the fourth capacitor is connected to pin 1 of the first voltage regulator chip and to the power supply VBAT terminal, the other end of the fourth capacitor is respectively connected to pin 2 of the first voltage regulator chip and one end of the fifth capacitor, and is connected to the ground terminal GND, the other end of the fifth capacitor is connected to pin 3 of the first voltage regulator chip and is led out as the power supply VCC5V terminal, and pin 4 of the first voltage regulator chip is connected to the ground terminal GND; one end of the sixth capacitor is connected to pin 1 of the second voltage regulator chip and is connected to the power supply VBAT terminal, the other end of the sixth capacitor is respectively connected to pin 2 of the second voltage regulator chip and one end of the seventh capacitor, and is connected to the ground terminal GND, the other end of the seventh capacitor is connected to pin 3 of the second voltage regulator chip and is led out as the reference voltage VREF terminal, and pin 4 of the second voltage regulator chip is connected to the ground terminal GND.

4. The high-efficiency, energy-saving, low-power DC dual-motor driving device according to claim 3, characterized in that: The buffer amplifier circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, an eighth capacitor, a buffer driver chip and a signal input interface; Pin 1 of the buffer driver chip is connected to pins 4, 7, 10 and 13 respectively, and is connected to the ground terminal GND, pin 2 of the buffer driver chip is connected to one end of the second resistor, and is connected to the signal input port PWM1, pin 3 of the buffer driver chip is led out as the PWM signal output port IN1, pin 5 of the buffer driver chip is connected to one end of the fourth resistor, and is connected to the signal input port PWM2, pin 6 of the buffer driver chip is led out as the PWM signal output port IN2, pin 8 of the buffer driver chip is led out as the PWM signal output port IN3, pin 9 of the buffer driver chip is connected to the fifth One end of the resistor is connected and connected to the signal input port PWM3, the 11th pin of the buffer driver chip is led out as the PWM signal output port IN4, the 12th pin of the buffer driver chip is connected to one end of the third resistor and connected to the signal input port PWM4, the 14th pin of the buffer driver chip is connected to the positive end of the eighth capacitor and connected to the power supply VCC5V terminal, the other end of the second resistor is connected to the other end of the fourth resistor and connected to the ground terminal GND, the other end of the third resistor is connected to the other end of the fifth resistor and connected to the ground terminal GND, and the negative end of the eighth capacitor is connected to the ground terminal GND.

5. The high-efficiency, energy-saving, low-power DC dual-motor driving device according to claim 4, characterized in that: The motor drive main circuit includes a first motor drive chip, a second motor drive chip, a sixth resistor, a seventh resistor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a first signal output interface and a second signal output interface; Pin 1 of the first motor driver chip is connected to the ground terminal GND, pin 2 of the first motor driver chip is connected to the PWM signal output port IN2, pin 3 of the first motor driver chip is connected to the PWM signal output port IN1, pin 4 of the first motor driver chip is connected to one end of the ninth capacitor and to the reference voltage VREF terminal, pin 5 of the first motor driver chip is respectively connected to one end of the tenth capacitor and the positive end of the eleventh capacitor, and is connected to the power supply VBAT terminal, pin 6 of the first motor driver chip is led out as the signal output port OUT1, pin 7 of the first motor driver chip is connected to one end of the sixth resistor, pin 8 of the first motor driver chip is led out as the signal output port OUT2, pin 9 of the first motor driver chip is connected to the ground terminal GND, the other end of the ninth capacitor is connected to the ground terminal GND, the other end of the tenth capacitor is connected to the ground terminal GND, the negative end of the eleventh capacitor is connected to the ground terminal GND, and the other end of the sixth resistor is connected to the ground terminal GND; pin 1 of the second motor driver chip is connected to the ground terminal GND , pin 2 of the second motor driver chip is connected to the PWM signal output port IN4, pin 3 of the second motor driver chip is connected to the PWM signal output port IN3, pin 4 of the second motor driver chip is connected to one end of the twelfth capacitor and is connected to the reference voltage VREF end, pin 5 of the second motor driver chip is respectively connected to one end of the thirteenth capacitor and the positive end of the fourteenth capacitor, and is connected to the power supply VBAT end, pin 6 of the second motor driver chip is led out as the signal output port OUT3, pin 7 of the second motor driver chip is connected to one end of the seventh resistor, pin 8 of the second motor driver chip is led out as the signal output port OUT4, pin 9 of the second motor driver chip is connected to the ground terminal GND, the other end of the twelfth capacitor is connected to the ground terminal GND, the other end of the thirteenth capacitor is connected to the ground terminal GND, the negative end of the fourteenth capacitor is connected to the ground terminal GND, and the other end of the seventh resistor is connected to the ground terminal GND; signal output ports OUT1, OUT2, OUT3, and OUT4 are all connected to the motor signal output end.

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