CN-121984383-A - Brushless motor control driving circuit with high voltage-resistant isolation strength

CN121984383ACN 121984383 ACN121984383 ACN 121984383ACN-121984383-A

Abstract

The invention relates to a brushless motor driving circuit, in particular to a brushless motor control driving circuit with high pressure-resistant isolation strength, which comprises a control circuit, a sampling circuit and a detection circuit, wherein the control circuit is used for receiving and processing voltage signals fed back by the sampling circuit and the detection circuit and outputting control signals to the driving circuit; the brushless motor driving circuit comprises a driving circuit, a sampling circuit, a control circuit, a detection circuit, a control circuit and a control circuit, wherein the driving circuit outputs a driving signal under the action of a control signal to drive the brushless motor to perform phase change or start and stop, the sampling circuit detects a current signal when the driving circuit works and converts the current signal into a first voltage signal to be sent to the control circuit so as to enable the control circuit to monitor three-phase current of the brushless motor in real time, the detection circuit detects a Hall signal of the brushless motor with a Hall sensor and converts a phase change state of the brushless motor into a second voltage signal to be sent to the control circuit so as to enable the control circuit to detect the rotor position in real time, and the technical scheme provided by the invention can overcome the defects that the environment adaptability is poor and the accurate driving of the brushless motor is difficult to realize in the prior art.

Inventors

ZHANG MINGZHI
LU HAOXIANG
LU XIN

Assignees

安徽贝科邦生物科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (7)

1. A brushless motor control driving circuit with high voltage-resistant isolation strength is characterized by comprising a power isolation circuit, a first power conversion circuit, a second power conversion circuit, a control circuit, a driving circuit, a sampling circuit and a detection circuit; The power isolation circuit enhances the voltage-resistant isolation strength and the anti-interference capability of the output voltage of the direct-current power supply, and outputs the isolated voltage to the driving circuit for power supply; the first power supply conversion circuit is used for reducing the voltage output by the power supply isolation circuit and outputting the reduced voltage to the driving circuit for supplying power; the second power supply conversion circuit is used for carrying out secondary voltage reduction on the voltage output by the first power supply conversion circuit and outputting the voltage subjected to secondary voltage reduction to the control circuit, the sampling circuit and the detection circuit for power supply; The control circuit receives and processes the voltage signals fed back by the sampling circuit and the detection circuit and outputs control signals to the driving circuit; The driving circuit comprises a three-phase bridge driving circuit consisting of a half-bridge driving chip and an NMOS chip, and outputs a driving signal under the action of a control signal so as to drive the brushless motor to commutate or start and stop; The sampling circuit detects a current signal when the driving circuit works and converts the current signal into a first voltage signal to be sent to the control circuit so that the control circuit monitors three-phase current of the brushless motor in real time; The detection circuit detects a Hall signal of the brushless motor with the Hall sensor, converts the phase change state of the brushless motor into a second voltage signal and sends the second voltage signal to the control circuit so that the control circuit detects the position of the rotor in real time; The sampling circuit comprises a U-phase sampling circuit, a V-phase sampling circuit and a W-phase sampling circuit, the U-phase sampling circuit, the V-phase sampling circuit and the W-phase sampling circuit have the same structure, and the W-phase sampling circuit comprises a first operational amplifier chip U6, a twenty-second capacitor C22, an eighteenth resistor R18 and a twentieth resistor R20; The VCC pin of the first operational amplifier chip U6 is connected with +5V direct current, the VSS pin of the first operational amplifier chip U6 is connected with ground, and after the W-phase current signal IW is converted into W-phase sampling voltage through a seventh resistor R7, the W-phase sampling voltage is input into the +IN pin of the first operational amplifier chip U6 through a nineteenth resistor R19; the-IN pin of the first operational amplifier chip U6 is connected with the ground through a twenty-second resistor R20, the VCC pin of the first operational amplifier chip U6 is connected with the ground through a twenty-second capacitor C22, the OUT pin and the-IN pin of the first operational amplifier chip U6 are respectively connected with two ends of an eighteenth resistor R18, the OUT pin of the first operational amplifier chip U6 is connected with the PD3 (HS)/TIM2_CH2 [ ADC_ETR ] pin of the control chip U4, and a first W-phase voltage signal is sent to the control chip U4.
2. The brushless motor control driving circuit with high voltage isolation strength according to claim 1, wherein the power isolation circuit comprises a power isolation chip U1, a first fuse F1, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a first diode D1; One end of the first fuse F1 is connected with a +24VIN direct current power supply, the other end of the first fuse F1 is connected with one end of the first capacitor C1, the other end of the first capacitor C1 is connected with the ground, the vin+ pin of the power isolation chip U1 is connected with one end of the first capacitor C1, and the VIN-pin of the power isolation chip U1 is connected with the other end of the first capacitor C1; The VO+ pin of the power isolation chip U1 is connected with one end of the second capacitor C2, the VO-pin of the power isolation chip U1 is connected with the other end of the second capacitor C2, one end of the second capacitor C2, the anode of the third capacitor C3 and the cathode of the first diode D1 are connected, +24V direct current is output to the driving circuit and the first power conversion circuit, and the other end of the second capacitor C2, the cathode of the third capacitor C3 and the anode of the first diode D1 are connected with the ground.
3. The brushless motor control driving circuit with high voltage isolation strength according to claim 2, wherein the first power conversion circuit has the same structure as the second power conversion circuit, and comprises a first power conversion chip U2, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first inductor L1 and a second diode D2; The VIN pin of the first power conversion chip U2, one end of the sixth capacitor C6 and the positive electrode of the fifth capacitor C5 are connected with +24V direct current, the GND pin and the ON/OFF pin of the first power conversion chip U2, the other end of the sixth capacitor C6 and the negative electrode of the fifth capacitor C5 are connected with the ground; The OUTPUT pin of the first power conversion chip U2 is connected with one end of the first inductor L1 and the cathode of the second diode D2, the anode of the second diode D2 and the cathode of the fourth capacitor C4 are connected with the ground, the FEEDBACK pin of the first power conversion chip U2 is connected with the anode of the fourth capacitor C4, the other end of the first inductor L1 and the anode of the fourth capacitor C4 are connected, and +12V direct current is OUTPUT to the driving circuit and the second power conversion circuit.
4. The brushless motor control driving circuit having high withstand voltage separating strength according to claim 3, wherein the second power converting circuit converts +12V DC power into +5V DC power and outputs to the control circuit, the sampling circuit and the detecting circuit.
5. The brushless motor control driving circuit with high voltage isolation strength according to claim 4, wherein the control circuit comprises a control chip U4, tenth to seventeenth capacitors C10 to C17, a first resistor R1, a second resistor R2, and a first crystal oscillator X1; The two ends of the first crystal oscillator X1 are respectively connected with the ground through a tenth capacitor C10 and an eleventh capacitor C11, the first crystal oscillator X1 is connected with a first resistor R1 in parallel, and an OSCIN/PA1 pin of the control chip U4 are respectively connected with the two ends of the first resistor R1; one end of each of the twelfth capacitor C12 to the fifteenth capacitor C15 is connected with +5V direct current, and the other ends of the twelfth capacitor C12 to the fifteenth capacitor C15 are connected with ground; The NRST pin of the control chip U4 is connected with +5V direct current through the second resistor R2, the NRST pin and the VSS pin of the control chip U4 are respectively connected with two ends of the sixteenth capacitor C16, the VSS pin of the control chip U4 is connected with the ground, the VCAP pin of the control chip U4 is connected with the ground through the seventeenth capacitor C17, and the VDD pin, the VDDIO pin and the VDDA pin of the control chip U4 are connected with +5V direct current.
6. The brushless motor control driving circuit with high voltage isolation strength according to claim 5, wherein the driving circuit comprises a driving chip U5, a U-phase driving circuit, a V-phase driving circuit and a W-phase driving circuit, the U-phase driving circuit, the V-phase driving circuit and the W-phase driving circuit have the same structure, and the W-phase driving circuit comprises a first NMOS chip Q1, an eighteenth capacitor C18, third to seventh resistors R3 to R7 and a fourth diode D4; The HIN3 pin and the LIN3 pin of the driving chip U5 are respectively connected with the PC3 (HS)/TIM1_CH3 pin and the [ TIM1_CH3N ] AIN2/PB2 pin of the control chip U4, and receive W-phase control signals PWM_WH and PWM_WL sent by the control chip U4; the positive electrode of the fourth diode D4 is connected with +12V direct current, the negative electrode of the fourth diode D4 is connected with the VB3 pin of the driving chip U5, and the VB3 pin and the VS3 pin of the driving chip U5 are respectively connected with the two ends of the eighteenth capacitor C18; The DC motor driving circuit comprises a first NMOS chip Q1, a driving chip U5, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fourth resistor R4, a fourth resistor R6, a fifth resistor R4, a fourth resistor R4, a fifth resistor R5, a brushless motor W and a driving signal W, wherein the D2 pin of the first NMOS chip Q1 is connected with +24V DC power, the HO3 pin of the driving chip U5 is connected with the G2 pin of the first NMOS chip Q1 through the third resistor R3, the VS3 pin of the driving chip U5 is connected with the D1 pin of the first NMOS chip Q1, the LO3 pin of the driving chip U5 is connected with the G3 pin of the first NMOS chip Q1 through the fourth resistor R4, the G2 pin of the first NMOS chip Q1 is connected with the G1 pin of the first NMOS chip Q1 through the fourth resistor R4, the D1 pin of the first NMOS chip Q1 is connected with the two ends of the fifth resistor R5, the D1 pin of the D1 of the first NMOS chip Q1 is connected with the two ends of the first NOMS chip Q1, the G1 is connected with the two ends of the sixth resistor R6 respectively, the S1 pin of the S1 of the first NMOS chip Q1 is connected with the ground through the seventh resistor R7.
7. The brushless motor control driving circuit with high voltage isolation strength according to claim 6, wherein VCC pin of the driving chip U5 is connected with +12V DC, COM pin of the driving chip U5 is connected with ground, VCC pin and COM pin of the driving chip U5 are respectively connected with twenty-first capacitor C21.

Description

Brushless motor control driving circuit with high voltage-resistant isolation strength Technical Field The present invention relates to a brushless motor driving circuit, and more particularly, to a brushless motor control driving circuit having high voltage-resistant isolation strength. Background Brushless motors are widely used in a variety of fields because of their advantages of high efficiency, long life, low noise, etc. The driving circuit is used as an important component of the operation of the brushless motor, and the performance of the driving circuit directly influences the stability and reliability of the operation of the brushless motor. Currently, a driving circuit for a brushless motor on the market is generally composed of three parts, i.e., a power supply circuit, a control circuit, and a driving circuit. However, the brushless motor driving circuit with the traditional structure has the defects of low integration level, relatively independent circuit modules, larger overall volume, larger limitation in application scenes with limited installation space, more complex circuit structure, increased difficulty of circuit design and high production and maintenance cost. In addition, in practical applications, brushless motors face various complex operating conditions and environmental disturbances. The existing brushless motor driving circuit is poor in pressure-resistant isolation strength and anti-interference capability, and stable operation of the motor under severe conditions such as high pressure, strong interference and the like is difficult to ensure. Meanwhile, the functions of current monitoring and rotor position detection of the motor are not perfect, accurate driving of the brushless motor cannot be achieved, and the performance and service life of the motor are easily affected. Therefore, the brushless motor control driving circuit which has high integration level, small volume, simple structure, high pressure-resistant isolation strength and strong anti-interference capability and can accurately monitor the motor current and the rotor position is developed, and has important practical significance and application value. Disclosure of Invention (One) solving the technical problems In view of the above-mentioned drawbacks of the prior art, the present invention provides a brushless motor control driving circuit with high voltage-resistant isolation strength, which can effectively overcome the defects of poor environmental adaptability and difficulty in realizing accurate driving of a brushless motor in the prior art. (II) technical scheme In order to achieve the above purpose, the invention is realized by the following technical scheme: a brushless motor control driving circuit with high voltage-resistant isolation strength comprises a power isolation circuit, a first power conversion circuit, a second power conversion circuit, a control circuit, a driving circuit, a sampling circuit and a detection circuit; The power isolation circuit enhances the voltage-resistant isolation strength and the anti-interference capability of the output voltage of the direct-current power supply, and outputs the isolated voltage to the driving circuit for power supply; the first power supply conversion circuit is used for reducing the voltage output by the power supply isolation circuit and outputting the reduced voltage to the driving circuit for supplying power; the second power supply conversion circuit is used for carrying out secondary voltage reduction on the voltage output by the first power supply conversion circuit and outputting the voltage subjected to secondary voltage reduction to the control circuit, the sampling circuit and the detection circuit for power supply; The control circuit receives and processes the voltage signals fed back by the sampling circuit and the detection circuit and outputs control signals to the driving circuit; The driving circuit comprises a three-phase bridge driving circuit consisting of a half-bridge driving chip and an NMOS chip, and outputs a driving signal under the action of a control signal so as to drive the brushless motor to commutate or start and stop; The sampling circuit detects a current signal when the driving circuit works and converts the current signal into a first voltage signal to be sent to the control circuit so that the control circuit monitors three-phase current of the brushless motor in real time; The detection circuit detects a Hall signal of the brushless motor with the Hall sensor, converts the phase change state of the brushless motor into a second voltage signal and sends the second voltage signal to the control circuit so that the control circuit detects the position of the rotor in real time; The sampling circuit comprises a U-phase sampling circuit, a V-phase sampling circuit and a W-phase sampling circuit, the U-phase sampling circuit, the V-phase sampling circuit and the W-phase sampling circuit have the same structure, and t