CN219812091U - Novel alternating current brushless motor driver - Google Patents

Abstract

The utility model discloses a novel alternating current brushless motor driver which comprises an input rectifying and filtering module, an internal power supply module, an MCU control module, a grid driving module, a three-phase inverter module, an overcurrent detection module, an overvoltage detection module, a temperature detection module, a Hall signal detection module and an MCU control module, wherein the grid driving module is connected with the three-phase inverter module and controls the three-phase inverter module to work, the three-phase inverter module is connected with a motor to control the motor to work, the MCU control module is connected with a cooling control unit for controlling a fan to start cooling, an N-channel field effect tube Q8 is arranged in the cooling control unit, the drain electrode of the N-channel field effect tube Q8 is connected with a pin 1 of an interface J2, the source electrode of the N-channel field effect tube Q8 is grounded, the grid electrode of the N-channel field effect tube Q8 is connected with an MCU control chip U8, a pin 2 of the interface J2 is connected with the internal power supply module, and the interface J2 is connected with the fan.

Description

Novel alternating current brushless motor driver

Technical Field

The utility model relates to the field of driving circuits, in particular to a novel alternating current brushless motor driver.

Background

The brushless motor driver is mainly used for enabling the brushless motor to rotate, and the working principle is as follows: the control part firstly determines the sequence of starting (or closing) the power transistors in the inverter according to the position of the motor rotor sensed by the Hall sensor and then according to the stator winding, so that current sequentially flows through the motor coil to generate a forward (or reverse) rotating magnetic field and interact with the magnet of the rotor, and the motor can rotate clockwise/anticlockwise. When the motor rotor rotates to the position that the Hall sensor senses another group of signals, the control part turns on the next group of power transistors again, so that the circulating motor can continue to rotate in the same direction until the control part determines that the motor rotor stops and turns off the power transistors (or turns on only the lower arm power transistors); the power transistors are turned on in reverse order when the motor rotor needs to be controlled to reverse.

At present, a plurality of AC type drivers are used for driving an AC motor in the market, and the AC motor has the defects of large volume, slow starting response, small low-speed moment and the like.

A brushless dc motor driving system disclosed in, for example, CN 105515463 includes an EMI filter unit, a rectifying filter unit, a dc buck converter, a controller, a dc ac inverter, and a hall signal detection unit; the EMI filtering unit is used for eliminating electromagnetic interference in the alternating current; the rectification filter module is used for converting alternating current into high-voltage direct current; the direct-current buck converter is used for converting high-voltage direct current into low-voltage direct current; the direct current-alternating current inverter is used for converting low-voltage direct current into alternating current so as to drive the motor to rotate; the Hall signal detection unit is used for detecting the rotating speed of the motor and outputting a Hall switch signal to the controller; the controller is used for outputting a control signal to the direct current-alternating current inverter according to the Hall switch signal, so that the direct current-alternating current inverter changes the period of alternating current according to the control signal to drive the motor to rotate.

The DC brushless motor driving system finally adopts a DC/AC inverter to convert low-voltage DC into AC to drive the motor to rotate, and the motor is actually an AC motor/motor, and the AC motor/motor has the defects of large volume, slow starting response, small low-speed moment and the like. Meanwhile, the direct current brushless motor driving system has no temperature detection function and no fan heat dissipation function, so that the direct current brushless motor driving system well achieves heat dissipation of an alternating current motor/motor.

In view of this, the present inventors have proposed the following means.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a novel alternating current brushless motor driver.

In order to solve the technical problems, the utility model adopts the following technical scheme: the novel AC brushless motor driver comprises an input rectifying and filtering module, an internal power supply module, a grid driving module, a three-phase inverter module, an overcurrent detection module, an overvoltage detection module, a temperature detection module, a Hall signal detection module and an MCU control module, wherein the grid driving module, the three-phase inverter module, the overcurrent detection module, the overvoltage detection module, the temperature detection module and the Hall signal detection module are all connected with the MCU control module, the grid driving module is connected with the three-phase inverter module and controls the three-phase inverter module to work, the three-phase inverter module is connected with a motor to control the motor to work, an MCU control chip U8 of the MCU control module is connected with a cooling control unit for controlling a fan to start cooling, an N-channel field effect transistor Q8 is arranged in the cooling control unit, a drain electrode of the N-channel field effect transistor Q8 is connected with a 1 pin of an interface J2, a source electrode of the N-channel field effect transistor Q8 is grounded, a grid of the N-channel field effect transistor Q8 is connected with the MCU control chip U8, a 2 pin of the interface J2 is connected with the internal power supply module, and the interface J2 is connected with the fan.

Furthermore, in the above technical solution, the gate driving module includes a gate driving chip U1, a gate driving chip U2, and a gate driving chip U5, which are connected to the MCU control module and the three-phase inverter module; the three-phase inverter module comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q4, a field effect transistor Q5, a field effect transistor Q6 and a field effect transistor Q7, wherein the grid of the field effect transistor Q1 and the grid of the field effect transistor Q2 are connected with a grid driving chip U1 and are controlled to be conducted by the grid driving chip U1; the source electrode of the field effect tube Q1 and the drain electrode of the field effect tube Q2 are connected and connected with the U end, and the grid electrode of the field effect tube Q4 and the grid electrode of the field effect tube Q5 are connected with the grid electrode driving chip U2 and are controlled to be conducted by the grid electrode driving chip U2; the source electrode of the field effect tube Q4 and the drain electrode of the field effect tube Q5 are connected and connected with the V end, the grid electrode of the field effect tube Q6 and the grid electrode of the field effect tube Q7 are connected with the grid electrode driving chip U5, and the grid electrode driving chip U5 controls the connection; the source electrode of the field effect transistor Q6 is connected with the drain electrode of the field effect transistor Q7 and the W end; the drains of the field effect transistor Q1, the field effect transistor Q4 and the field effect transistor Q6 are all connected with a direct current power supply end.

Furthermore, in the above technical solution, the three-phase inverter module further includes a bleeder resistor R6 and a bleeder resistor R8 disposed on the source of the fet Q1 and used for protecting a circuit, and a sampling resistor R38 disposed on the source of the fet Q2, the fet Q5, and the fet Q7, where the sampling resistor R38 is further grounded, and the sampling resistor R38 is used for converting a current signal into a voltage signal and feeding the voltage signal back to the current detection filter unit of the overcurrent detection module.

Furthermore, in the above technical scheme, the input rectifying and filtering module includes an input protection unit, a rectifying unit, an anti-surge current unit and a filtering unit, which are sequentially connected, the internal power supply module is connected to a dc power supply end of the filtering unit, and the input protection unit includes a fuse F1 and an X safety capacitor X1.

Furthermore, in the above technical solution, the anti-surge current unit includes a thermistor NTC1 and a relay unit connected in parallel to two ends of the thermistor NTC1, where the relay unit includes a relay K1 and an N-channel field effect transistor Q3 connected between the relay K1 and the internal power supply module.

Furthermore, in the above technical solution, the internal power supply module includes a transformer T1 connected to the dc power supply end of the input rectifying and filtering module, a dc power supply unit disposed at one end of the transformer T1, and a power management chip U6 connected between the transformer T1 and the dc power supply unit, where the dc power supply unit is provided with a +12v output pin and a +3v output pin.

Furthermore, in the above technical solution, the overcurrent detection module includes a comparator U4A and a comparator U4B, and the pin 2 of the comparator U4A and the pin 6 of the comparator U4B are both connected to the sampling resistor R38 to be used for collecting a voltage value at one end of the sampling resistor R38 of the three-phase inverter module; the 3 pin of the comparator U4A is connected with a reference voltage unit, the 5 pin of the comparator U4B is connected with a reference voltage unit, and the reference voltage unit are both connected with the same pin of the MCU control chip U8 in the MCU control module; and a pin 1 of the comparator U4A and a pin 7 of the comparator U4B are respectively connected with two pins of the MCU control chip U8.

Furthermore, in the above technical solution, the overvoltage detection module includes a voltage dividing resistor R2, a voltage dividing resistor R4, a voltage dividing resistor R7 and a voltage dividing resistor R12 connected to the input rectifying and filtering module, where the voltage dividing resistor R2, the voltage dividing resistor R4, the voltage dividing resistor R7 and the voltage dividing resistor R12 are sequentially connected in series, the voltage dividing resistor R12 is grounded at the other end of the voltage dividing resistor R12, and a connection line between the voltage dividing resistor R7 and the voltage dividing resistor R12 is connected to the MCU control chip U8 of the CU control module.

Furthermore, in the above technical solution, the temperature detection module includes a thermistor NTC2, a resistor R51 and a capacitor C27, wherein one end of the thermistor NTC2 is connected to the internal power supply module, the other end of the thermistor NTC2 is connected to the MCU control chip U8 of the MCU control module, and the resistor R51 and the capacitor C27 are connected to the other end of the thermistor NTC 2.

Furthermore, in the above technical solution, the hall signal detection module includes a hall signal filtering unit for filtering signals of the hall sensor inside the motor and connecting the signals to the MCU control chip U8 of the MCU control module.

By adopting the technical scheme, compared with the prior art, the utility model has the following beneficial effects: the utility model is mainly applied to the AC brushless motor driver, is used for replacing the AC brushless motor driver used for driving the AC motor in the market, and is used for obtaining the AC brushless motor driver with smaller volume, faster starting response and large low-speed moment under the same power. The temperature detection module is used for detecting the real-time temperature of the three-phase inverter module, when the temperature exceeds a preset value, the MCU control module controls the cooling control unit to work so as to control the fan to start, thereby realizing cooling, when the temperature exceeds an abnormal value, the MCU control module controls the grid driving module to control the motor and stop rotating, and simultaneously sends out an alarm signal, so that the stability and the safety of work are ensured.

Drawings

FIG. 1 is a circuit diagram of an input rectifying and filtering module in the present utility model;

FIG. 2 is a circuit diagram of an internal power module of the present utility model;

FIG. 3 is a circuit diagram of a gate driving module according to the present utility model;

fig. 4 is a circuit diagram of a three-phase inverter module in the present utility model;

FIG. 5 is a circuit diagram of an overcurrent detection module according to the present utility model;

FIG. 6 is a circuit diagram of an overvoltage detection module according to the present utility model;

FIG. 7 is a circuit diagram of a temperature detection module of the present utility model;

FIG. 8 is a circuit diagram of a Hall signal detection module of the present utility model;

FIG. 9 is a circuit diagram of the MCU control module of the present utility model;

fig. 10 is a circuit diagram of the peripheral auxiliary circuit module in the present utility model.

Description of the embodiments

The utility model will be further described with reference to specific examples and figures.

Referring to fig. 1 to 10, there is shown a novel ac type brushless motor driver comprising: the three-phase motor control system comprises an input rectifying and filtering module 1, an internal power supply module 2, a grid driving module 3, a three-phase inverter module 4, an overcurrent detection module 5, an overvoltage detection module 6, a temperature detection module 7, a Hall signal detection module 8 and an MCU control module 9, wherein the grid driving module 3, the three-phase inverter module 4, the overcurrent detection module 5, the overvoltage detection module 6, the temperature detection module 7 and the Hall signal detection module 8 are all connected with the MCU control module 9, and the grid driving module 3 is connected with the three-phase inverter module 4 and controls the three-phase inverter module 4 to work, and the three-phase inverter module 4 is connected with a motor to control the motor to work.

The input rectifying and filtering module 1 comprises an input protection unit 11, a rectifying unit 12, an anti-surge current unit 13 and a filtering unit 14 which are sequentially connected, the internal power supply module 2 is connected to a direct current power supply end 140 of the filtering unit 14, and the input protection unit 11 comprises a fuse F1 and an X safety capacitor X1. The anti-surge current unit 13 comprises a thermistor NTC1 and a relay unit 15 connected in parallel with two ends of the thermistor NTC1, and the relay unit 15 comprises a relay K1 and an N-channel field effect transistor Q3 connected with the relay K1 and the internal power supply module 2. When in operation, the device comprises: the 220V ac is subjected to EMI filtering by the X1 safety capacitor and then is input to the ZDL1 rectifier bridge as the rectifying unit 12 to obtain a pulsating dc, and then is subjected to filtering by the capacitor C2 to obtain a smoother 310V dc, so as to supply power to the subsequent circuit, i.e. the 310V dc is used as the dc power supply terminal 140. The fuse F1, the thermistor NTC1 and the relay K1 all play a role of a protection circuit.

The dc power supply terminal 140 refers to +310V in the circuit diagram.

The internal power supply module 2 comprises a transformer T1 connected with the dc power supply end 140 of the input rectifying and filtering module 1, a dc power supply unit 21 arranged at one end of the transformer T1, and a power management chip U6 connected with the transformer T1 and the dc power supply unit 21, wherein the dc power supply unit 21 is provided with a +12v output pin and a +3v output pin. When in operation, the device comprises: the working frequency of the transformer T1 is controlled by the power management chip U6 to convert 310V direct current into alternating current, the alternating current is rectified and filtered by the diode D6, the capacitor C14, the capacitor C10 and the capacitor C11 to be changed into internal direct current power supply +12V, and then the +12V feeds voltage back to the 3 pin of the power management chip U6 through the voltage stabilizing tube D12 and is reduced to +3.3V through the linear voltage stabilizer U3.

The grid driving module 3 comprises a grid driving chip U1, a grid driving chip U2 and a grid driving chip U5 which are connected with the MCU control module 9 and the three-phase inverter module 4, wherein the grid driving chip U1 is used for driving a field effect transistor Q1 and a field effect transistor Q2 of the three-phase inverter module 4, the grid driving chip U2 is used for driving a field effect transistor Q4 and a field effect transistor Q5 of the three-phase inverter module 4, and the grid driving chip U5 is used for driving a field effect transistor Q6 and a field effect transistor Q7 of the three-phase inverter module 4. During operation, the MCU control chip U8 of the MCU control module 9 outputs PWM signals to the three gate driving chips U1, U2 and U5 (each chip receives two paths of PWM signals), and then the three gate driving chips U1, U2 and U5 respectively drive the field effect transistor Q1 and the field effect transistor Q2, the field effect transistor Q4 and the field effect transistor Q5 and the field effect transistor Q6 and the field effect transistor Q7 of the three-phase inverter module 4 to work.

The grid driving module 3 comprises a grid driving chip U1, a grid driving chip U2 and a grid driving chip U5 which are connected with the MCU control module 9 and the three-phase inverter module 4; the three-phase inverter module 4 comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q4, a field effect transistor Q5, a field effect transistor Q6 and a field effect transistor Q7, wherein the grid of the field effect transistor Q1 and the grid of the field effect transistor Q2 are connected with a grid driving chip U1 and are controlled to be conducted by the grid driving chip U1; the source electrode of the field effect tube Q1 and the drain electrode of the field effect tube Q2 are connected and connected with the U end, and the grid electrode of the field effect tube Q4 and the grid electrode of the field effect tube Q5 are connected with the grid electrode driving chip U2 and are controlled to be conducted by the grid electrode driving chip U2; the source electrode of the field effect tube Q4 and the drain electrode of the field effect tube Q5 are connected and connected with the V end, the grid electrode of the field effect tube Q6 and the grid electrode of the field effect tube Q7 are connected with the grid electrode driving chip U5, and the grid electrode driving chip U5 controls the connection; the source electrode of the field effect transistor Q6 is connected with the drain electrode of the field effect transistor Q7 and the W end; the drains of the field effect transistor Q1, the field effect transistor Q4 and the field effect transistor Q6 are all connected to the dc power supply terminal 140. The three-phase inverter module 4 further includes a bleeder resistor R6 and a bleeder resistor R8 disposed on the source of the fet Q1 and used for protecting a circuit, and a sampling resistor R38 disposed on the sources of the fet Q2, the fet Q5, and the fet Q7, where the sampling resistor R38 is further grounded, and the sampling resistor R38 is used for converting a current signal into a voltage signal and feeding the voltage signal back to the current detection filter unit 52 of the overcurrent detection module 5. When in operation, the device comprises: the MCU control chip U8 controls the on and off of the field effect transistor Q1, the field effect transistor Q2, the field effect transistor Q4, the field effect transistor Q5 and the field effect transistor Q6 and the field effect transistor Q7 through the three grid driving chips U1, U2 and U5 so as to control the motor to rotate, wherein R6 and R8 are bleeder resistors, and R38 is a sampling resistor.

The U end, the V end and the W end are connected with 3 pins of the interface J4 and are used for being connected with a brushless motor.

The overcurrent detection module 5 comprises a comparator U4A and a comparator U4B, wherein a pin 2 of the comparator U4A and a pin 6 of the comparator U4B are both connected with the sampling resistor R38 so as to be used for collecting the voltage value at one end of the sampling resistor R38 of the three-phase inverter module 4; the 3 pin of the comparator U4A is connected with the reference voltage unit 51, the 5 pin of the comparator U4B is connected with the reference voltage unit 53, and the reference voltage unit 51 and the reference voltage unit 53 are both connected with the same pin (namely 46 pins) of the MCU control chip U8 in the MCU control module 9; and a pin 1 of the comparator U4A and a pin 7 of the comparator U4B are respectively connected with two pins of the MCU control chip U8. The 1 pin of the comparator U4A is connected with the 33 pin of the MCU control chip U8 of the MCU control module 9, and the 7 pin of the comparator U4B is connected with the 25 pin of the MCU control chip U8 of the MCU control module 9. When in operation, the device comprises: the voltage shunt_i collected by the sampling resistor R38 in the three-phase inverter module 4 is transmitted to the 2 pin of the comparator U4A and the 6 pin of the comparator U4B, and then is compared with the voltage values of the reference voltage unit 51 on the 3 pin of the comparator U4A and the reference voltage unit 53 on the 5 pin of the comparator U4B, respectively, and finally the comparison result is transmitted to the MCU control module 9.

For unexpected extremely high current conditions, such as: the utility model adopts the phase short-circuit protection technology, namely, the voltage SHUNT_I on the sampling resistor R38 is sent to the 6 pin of the comparator U4B, so that the voltage is compared with the reference voltage of the 5 pin of the comparator U4B, the obtained result is sent to the MCU control chip U8 of the MCU control module 9 through the 7 pin of the comparator U4B, the MCU control module 9 monitors the condition of excessive current according to the signal sent by the SHUNT_I, and if the condition exceeds the set maximum current, the control circuit performs single protection to prevent burning drive and fire. That is, the utility model adopts the wave-by-wave current limiting technology, which is realized by the MCU control module, the voltage SHUNT_I obtained by collecting the bus peak current through the sampling resistor R38 is compared with the current limiting reference voltage, the true and false result is obtained, the MCU control module turns off the driving circuit, and the current is limited near the set current, which protects the motor while protecting the driver, and simultaneously limits the torque output by the motor within a certain range, reduces the overcurrent alarm under normal conditions, and reduces the maintenance work of clients. Therefore, the performance is met, better cost control is achieved, and better cost performance can be given to customers.

The overvoltage detection module 6 comprises a voltage dividing resistor R2, a voltage dividing resistor R4, a voltage dividing resistor R7 and a voltage dividing resistor R12 which are connected with the input rectifying and filtering module 1, and the voltage dividing resistor R12 of the overvoltage detection module 6 is used for connecting the divided voltage value to a 19 pin of an MCU control chip U8 of the MCU control module 9. When in operation, the device comprises: the power supply voltage is divided by a voltage dividing resistor R2, a voltage dividing resistor R4, a voltage dividing resistor R7 and a voltage dividing resistor R12, and then the divided voltage value is directly sent to a 19 pin of an MCU control chip U8 of the MCU control module 9 from the voltage dividing resistor R12 for real-time monitoring.

The temperature detection module 7 comprises a thermistor NTC2, a resistor R51 and a capacitor C27, wherein one end of the thermistor NTC2 is connected with the internal power supply module 2, the other end of the thermistor NTC2 is connected with a pin 10 of an MCU control chip U8 of the MCU control module 9, and the resistor R51 and the capacitor C27 are connected with the other end of the thermistor NTC 2; the cooling control unit 71 for controlling the fan to start and cool is arranged on the 14 pins of the MCU control chip U8 of the MCU control module 9, an N-channel field effect tube Q8 is arranged in the cooling control unit 71, the drain electrode of the N-channel field effect tube Q8 is connected with the 1 pin of the interface J2, the source electrode of the N-channel field effect tube Q8 is grounded, the grid electrode of the N-channel field effect tube Q8 is connected with the MCU control chip U8, the 2 pin of the interface J2 is connected with the internal power supply module 2, and the interface J2 is connected with the fan. When in operation, the device comprises: the temperature detection is composed of a thermistor NTC2, a resistor R51 and a capacitor C27, and is used for detecting the real-time temperature of the three-phase inverter module 4 and transmitting the real-time temperature to a pin 10 of an MCU control chip U8 of the MCU control module 9. When the temperature exceeds the preset value, the MCU control chip U8 of the MCU control module 9 sends a signal to the cooling control unit 71 to drive the N-channel field effect transistor Q8 to be conducted, so that the fan is started to cool. When the temperature exceeds an abnormal value, the MCU control chip U8 of the MCU control module 9 controls the motor through the control grid driving module 3 and stops rotating, and simultaneously sends out an alarm signal.

The Hall signal detection module 8 comprises a Hall signal filtering unit 82, and the Hall signal filtering unit 82 filters signals of a Hall sensor in the motor and then connects the signals to pins 16, 17 and 18 of an MCU control chip U8 of the MCU control module 9. When in operation, the device comprises: and signals are transmitted to pins 16, 17 and 18 of the MCU control chip U8 of the internal MCU control module 9 through three Hall sensors in the motor, so that the running position of the motor is monitored in real time.

The MCU control module 9 is configured to receive all signals from the inside and the outside, monitor and process the signals appropriately, and output various signals for controlling the motor rotation, the fan rotation, the green LED lamp display, etc. As shown in fig. 10, the present utility model further includes a peripheral auxiliary circuit module.

The MCU control module 9 is additionally provided with an external connection panel ship-shaped switch SW1 and a potentiometer knob RT1 so as to control the start and stop of the motor and adjust the rotating speed, and meanwhile, the MCU control module 9 is additionally provided with an indication LED so that the observable panel green LED1 receives indication such as an alarm, and the device has the characteristics of low speed, large torque, wider speed regulation range, simplicity, convenience and rapidness in operation, high response speed and the like.

In summary, the present utility model is mainly applied to the ac brushless motor driver, and is used to replace the ac brushless motor driver used for driving the ac motor in the market, so as to obtain the ac brushless motor driver with smaller volume, faster starting response and large low-speed moment under the same power. The utility model can be used for detecting the real-time temperature of the three-phase inverter module 4 through the temperature detection module, when the temperature exceeds a preset value, the MCU control module 9 controls the cooling control unit 71 to work so as to control the fan to start, thereby realizing cooling, when the temperature exceeds an abnormal value, the MCU control module 9 controls the grid driving module 3 to control the motor and stop rotating, and simultaneously sends out an alarm signal, so that the stability and the safety of the work are ensured. The utility model adopts the 6-step phase-change technology through the three-phase inverter module 4, is simple and practical, can be compatible with most brushless motors in the market, and the MCU control module can calculate the rotating speed by reading the Hall sensor on the motor, so that the speed closed-loop control can be carried out, the speed steady-state precision is better than 0.5%, the rotating speed is from 200RPM to tens of thousands of revolutions, and the most market demands are met. Aiming at the overload problem, the utility model adopts a wave-by-wave current limiting technology, which is realized by an MCU control module, a voltage SHUNT_I obtained by collecting bus peak current through a sampling resistor R38 is compared with a current limiting reference voltage, and the obtained true and false result is obtained by closing a driving circuit by the MCU control module, so that the current is limited near the set current, the motor is protected while the driver is protected, the torque output by the motor can be limited within a certain range, the overcurrent alarm is reduced under the normal condition, and the maintenance work of a client is reduced. Therefore, the performance is met, better cost control is achieved, and better cost performance can be given to customers.

It is understood that the foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, but rather is to be accorded the full scope of all such modifications and equivalent structures, features and principles as set forth herein.

Claims (10)

1. The utility model provides a novel alternating current type brushless motor driver, a serial communication port, it includes input rectification filter module (1), inside power module (2), grid drive module (3), three-phase inverter module (4), overcurrent detection module (5), overvoltage detection module (6), temperature detection module (7), hall signal detection module (8), MCU control module (9), this grid drive module (3), three-phase inverter module (4), overcurrent detection module (5), overvoltage detection module (6), temperature detection module (7), hall signal detection module (8) all are connected with MCU control module (9), three-phase inverter module (4) are connected in grid drive module (3) and control this three-phase inverter module (4) work, this three-phase inverter module (4) are connected the motor and are used for controlling motor work, MCU control chip U8 of MCU control module (9) is connected with cooling control unit (71) that are used for controlling the fan and start the cooling, be provided with N channel field effect transistor Q8 in this cooling control unit (71), the drain electrode connection interface J2 of N channel field effect transistor Q8, the 1 foot of this N channel field effect transistor Q8, this grid connection J2 of this N channel field effect transistor Q8 connects the fan interface J2.

2. A novel ac brushless motor driver according to claim 1, wherein: the grid driving module (3) comprises a grid driving chip U1, a grid driving chip U2 and a grid driving chip U5 which are connected with the MCU control module (9) and the three-phase inverter module (4); the three-phase inverter module (4) comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q4, a field effect transistor Q5, a field effect transistor Q6 and a field effect transistor Q7, wherein the grid electrode of the field effect transistor Q1 and the grid electrode of the field effect transistor Q2 are connected with a grid electrode driving chip U1 and are controlled to be conducted by the grid electrode driving chip U1; the source electrode of the field effect tube Q1 and the drain electrode of the field effect tube Q2 are connected and connected with the U end, and the grid electrode of the field effect tube Q4 and the grid electrode of the field effect tube Q5 are connected with the grid electrode driving chip U2 and are controlled to be conducted by the grid electrode driving chip U2; the source electrode of the field effect tube Q4 and the drain electrode of the field effect tube Q5 are connected and connected with the V end, the grid electrode of the field effect tube Q6 and the grid electrode of the field effect tube Q7 are connected with the grid electrode driving chip U5, and the grid electrode driving chip U5 controls the connection; the source electrode of the field effect transistor Q6 is connected with the drain electrode of the field effect transistor Q7 and the W end; and the drains of the field effect transistor Q1, the field effect transistor Q4 and the field effect transistor Q6 are connected with a direct current power supply end (140).

3. A novel ac brushless motor driver according to claim 2, wherein: the three-phase inverter module (4) further comprises a bleeder resistor R6 and a bleeder resistor R8 which are arranged on the source electrode of the field effect tube Q1 and used for protecting a circuit, and a sampling resistor R38 which is arranged on the source electrodes of the field effect tube Q2, the field effect tube Q5 and the field effect tube Q7, wherein the sampling resistor R38 is further grounded, and the sampling resistor R38 is used for converting a current signal into a voltage signal and feeding the voltage signal back to a current detection filter unit (52) of the overcurrent detection module (5).

4. A novel ac brushless motor driver according to claim 1, wherein: the input rectifying and filtering module (1) comprises an input protection unit (11), a rectifying unit (12), an anti-surge current unit (13) and a filtering unit (14) which are sequentially connected, the internal power supply module (2) is connected to a direct-current power supply end (140) of the filtering unit (14), and the input protection unit (11) comprises a fuse F1 and an X safety capacitor X1.

5. A novel ac brushless motor driver according to claim 4, wherein: the anti-surge current unit (13) comprises a thermistor NTC1 and a relay unit (15) connected in parallel with two ends of the thermistor NTC1, wherein the relay unit (15) comprises a relay K1 and an N-channel field effect transistor Q3 connected with the relay K1 and the internal power supply module (2).

6. A novel ac brushless motor driver according to any one of claims 1-4, wherein: the internal power supply module (2) comprises a transformer T1 connected with a direct current power supply end (140) of the input rectifying and filtering module (1), a direct current power supply unit (21) arranged at one end of the transformer T1 and a power management chip U6 connected between the transformer T1 and the direct current power supply unit (21), wherein the direct current power supply unit (21) is provided with a +12V output pin and a +3V output pin.

7. A novel ac brushless motor driver according to claim 3, wherein: the overcurrent detection module (5) comprises a comparator U4A and a comparator U4B, wherein a pin 2 of the comparator U4A and a pin 6 of the comparator U4B are both connected with the sampling resistor R38 so as to be used for collecting a voltage value at one end of the sampling resistor R38 in the three-phase inverter module (4); the 3 pin of the comparator U4A is connected with a reference voltage unit (51), the 5 pin of the comparator U4B is connected with a reference voltage unit (53), and the reference voltage unit (51) and the reference voltage unit (53) are both connected with the same pin of the MCU control chip U8 in the MCU control module (9); and a pin 1 of the comparator U4A and a pin 7 of the comparator U4B are respectively connected with two pins of the MCU control chip U8.

8. A novel ac brushless motor driver according to claim 7, wherein: the overvoltage detection module (6) comprises a voltage dividing resistor R2, a voltage dividing resistor R4, a voltage dividing resistor R7 and a voltage dividing resistor R12 which are connected with the input rectifying and filtering module (1), the voltage dividing resistor R2, the voltage dividing resistor R4, the voltage dividing resistor R7 and the voltage dividing resistor R12 are sequentially connected in series, the voltage dividing resistor R12 is oppositely connected with the other end of the voltage dividing resistor R7 and grounded, and a connecting line between the voltage dividing resistor R7 and the voltage dividing resistor R12 is connected with the MCU control chip U8 of the CU control module (9).

9. A novel ac brushless motor driver according to any one of claims 1-4, wherein: the temperature detection module (7) comprises a thermistor NTC2, a resistor R51 and a capacitor C27, wherein one end of the thermistor NTC2 is connected with the internal power supply module (2), the other end of the thermistor NTC2 is connected with an MCU control chip U8 of the MCU control module (9), and the resistor R51 and the capacitor C27 are connected with the other end of the thermistor NTC 2.

10. A novel ac brushless motor driver according to any one of claims 1-4, wherein: the Hall signal detection module (8) comprises a Hall signal filtering unit (82) which is used for connecting signals of a Hall sensor in the motor to the MCU control chip U8 of the MCU control module (9) after filtering.