Driving circuit board of three-phase direct-current brushless motor

Abstract

The utility model relates to the technical field of electrical equipment, in particular to a driving circuit board of a three-phase direct-current brushless motor. Comprising a motor rotor position acquisition circuit module, a driving chip power supply circuit module, a driving chip enable circuit module, a pulse width modulation wave control circuit module, a driving chip serial communication circuit module and a phase current acquisition calibration circuit module. The separation of the driving circuit and the MCU is realized, and the circuit modification in the subsequent debugging process is facilitated; the pulse width modulation wave control circuit module and the phase current acquisition calibration circuit module are provided with a driving interface and a sampling interface, thereby facilitating direct connection between the driving circuit board and a three-phase bridge driving circuit of the motor, reducing fly line operation, and improving debugging efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, and particularly relates to a driving circuit board of a three-phase DC brushless motor. Background Art

[0002] During the development process of automotive parts, it is necessary to debug the function of driving a three-phase DC brushless motor for the MCU and the control circuit part. If the driving circuit is integrated into the control circuit part, later if the control circuit part needs to be modified, the entire circuit design including the control circuit and the driving circuit needs to be modified as a whole, which is inconvenient to operate, with a large amount of work and being cumbersome.

[0003] In addition, at present, the driving bridge MOSFET of many controllers is integrated on the motor. When the common driving board is used for motor function debugging, jumper wires are required. The operation content of jumper wires is relatively cumbersome, and the manual jumper wire soldering quality has a great influence on the test quality.

[0004] Therefore, it is necessary to design a driving circuit for a three-phase DC brushless motor to separate the driving circuit from the MCU control end, so as to save the time for circuit modification in the subsequent debugging process and improve the development efficiency; at the same time, the jumper wire operation can be reduced and the debugging efficiency can be improved. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a driving circuit board of a three-phase DC brushless motor to separate the driving circuit from the MCU control end, so as to save the time for circuit modification in the subsequent debugging process and improve the development efficiency; at the same time, the jumper wire operation can be reduced and the debugging efficiency can be improved.

[0006] To achieve the above object, the utility model provides a drive circuit board for a three-phase DC brushless motor, which includes a motor rotor position acquisition circuit module, a drive chip power supply circuit module, a drive chip enable circuit module, a pulse width modulation wave control circuit module, a drive chip serial communication circuit module, and a phase current acquisition and calibration circuit module. The motor rotor position acquisition circuit module is provided with four analog signal terminals respectively connected to the 1st to 4th pins of the MCU. The drive chip power supply circuit module is provided with a 12V power supply interface, a 3.3V power supply interface, a power ground interface, and a housing ground interface. The 12V power supply interface of the drive chip power supply circuit module is connected to the power supply terminal of the pulse width modulation wave control circuit module. The 3.3V power supply interface of the drive chip power supply circuit module is connected to the power supply terminals of the motor rotor position acquisition circuit module and the phase current acquisition and calibration circuit module. The drive chip enable circuit module is provided with an enable signal terminal, a sleep signal terminal, and a safety shutdown signal terminal respectively connected to the 5th to 7th pins of the MCU. The pulse width modulation wave control circuit module is provided with six pulse width modulation terminals respectively connected to the 8th to 13th pins of the MCU. The pulse width modulation wave control circuit module is provided with twelve drive interfaces connected to the three-phase bridge drive circuit. The drive chip serial communication circuit module is provided with an output signal terminal, an input signal terminal, a clock signal terminal, and a chip select signal terminal respectively connected to the 17th to 20th pins of the MCU. The phase current acquisition and calibration circuit module is provided with a voltage signal terminal one, a voltage signal terminal two, and a reference voltage signal terminal respectively connected to the 14th to 16th pins of the MCU. The phase current acquisition and calibration circuit module is provided with four sampling interfaces respectively connected to both ends of two sampling resistors of the three-phase bridge drive circuit.

[0007] The motor rotor position acquisition circuit module includes a motor rotor position detection chip, capacitors, resistors, four analog signal terminals, and a power supply terminal. The power supply terminal is divided into three paths and respectively connected to the 2nd pin, 6th pin of the motor rotor position detection chip, and one end of capacitor one. After the 5th pin of the motor rotor position detection chip is connected in series with resistor two, it is divided into two paths and respectively connected to one end of capacitor two and analog signal terminal four. After the 3rd pin of the motor rotor position detection chip is connected in series with resistor one, it is divided into two paths and respectively connected to one end of capacitor four and analog signal terminal three. After the 7th pin of the motor rotor position detection chip is connected in series with resistor three, it is divided into two paths and respectively connected to one end of capacitor three and analog signal terminal two. After the 1st pin of the motor rotor position detection chip is connected in series with resistor four, it is divided into two paths and respectively connected to one end of capacitor five and analog signal terminal one. The other ends of capacitor one, capacitor two, capacitor three, capacitor four, capacitor five, the 4th pin, and the 8th pin of the motor rotor position detection chip are grounded.

[0008] The described driving chip power supply circuit module includes a driving chip, a diode, capacitors, resistors, an inductor, a 12V power supply interface, a 3.3V power supply interface, a power ground interface, and a housing ground interface. The 12V power supply interface is divided into three paths and is respectively connected to one end of capacitor C48, one end of the inductor, and one end of resistor R48. The other end of capacitor C48 is connected to one end of capacitor C49. The other end of the inductor is divided into two paths and is respectively connected to the anode of the diode and one end of capacitor C26. The other end of capacitor C26 is connected to one end of capacitor C27. The cathode of the diode is divided into three paths and is respectively connected to one end of capacitor C46, one end of capacitor C10, and pin 25 of the driving chip. The other end of capacitor C46 is connected to one end of capacitor C47. The other end of capacitor C10 is connected to one end of capacitor C11. The other end of resistor R48 is divided into two paths and is respectively connected to one end of capacitor C28 and pin 20 of the driving chip. The other end of capacitor C28 is connected to one end of capacitor C29. The 3.3V power supply interface is divided into two paths and is respectively connected to one end of capacitor C9 and pin 14 of the driving chip. The other end of capacitor C49 is grounded and connected to the housing ground interface. The other ends of capacitor C27, capacitor C47, capacitor C11, capacitor C29, capacitor C9, pin 1, pin 29, pin 51, pin 63, and pin 65 of the driving chip are grounded and connected to the power ground interface.

[0009] The described driving chip enable circuit module includes a driving chip, capacitors, resistors, an enable signal terminal, a sleep signal terminal, a safety shutdown signal terminal, and a fault monitoring signal terminal. The enable signal terminal and the safety shutdown signal terminal are respectively connected to pin 64 and pin 16 of the driving chip. The sleep signal terminal is divided into two paths and is respectively connected to one end of resistor R45 and one end of resistor R46. The other end of resistor R46 is divided into two paths and is respectively connected to one end of capacitor C7 and pin 24 of the driving chip. Pin 3 of the driving chip is the fault monitoring signal terminal. The other ends of resistor R45 and capacitor C7 are grounded.

[0010] The pulse width modulation wave control circuit module includes a driving chip, a capacitor, a resistor, a diode, a power supply end, six pulse width modulation ends, and twelve driving interfaces. After the power supply end is connected in series with resistor 66, it is divided into four paths and respectively connected to one end of capacitor 23, pin 36, pin 40, and pin 45 of the driving chip. The pulse width modulation end 1, pulse width modulation end 2, pulse width modulation end 3, pulse width modulation end 4, pulse width modulation end 5, and pulse width modulation end 6 are respectively connected to pin 4, pin 5, pin 7, pin 6, pin 8, and pin 9 of the driving chip. Pin 21 of the driving chip is connected to one end of capacitor 42, and the other end of capacitor 42 is connected to the other end of capacitor 42. One end is divided into two paths and respectively connected to the cathode of diode 2 and pin 22 of the driver chip. Pin 27 of the driver chip is connected to one end of capacitor 43. The other end of capacitor 43 is divided into two paths and respectively connected to one end of resistor 65 and pin 28 of the driver chip. Pin 30 of the driver chip is connected to one end of capacitor 6. Pin 33 of the driver chip is connected in series with resistor 5, resistor 20 and capacitor 39, and then divided into two paths and respectively connected to one end of resistor 17 and drive interface 2. The other end of resistor 17 is connected in series with resistor 7 and then connected to pin 34 of the driver chip. Pin 35 of the driver chip is connected in series with resistor 6 and resistor 16 and then connected to drive interface 1. Pin 31 of the driver chip is connected in series with resistor 5, resistor 20 and capacitor 39. After connecting resistor 8 and resistor 18, they are connected to drive interface 3. After connecting resistor 9 and resistor 19 in series, pin 32 of the drive chip is connected to drive interface 4. After connecting resistor 22, resistor 21 and capacitor 40 in series, pin 41 of the drive chip is connected to one end of resistor 26 and drive interface 6 in two ways. After connecting resistor 27 in series with the other end of resistor 26, pin 42 of the drive chip is connected to drive interface 5. After connecting resistor 24 and resistor 23 in series, pin 43 of the drive chip is connected to drive interface 5. After connecting resistor 29 and resistor 28 in series, pin 38 of the drive chip is connected to drive interface 7. After connecting resistor 31 and resistor 32 in series, pin 37 of the drive chip is connected to drive interface 6. Pin 46 of the driving chip is connected in series with resistor 34, resistor 33, and capacitor 41, and then is divided into two paths and connected to one end of resistor 38 and driving interface 10 respectively. The other end of resistor 38 is connected in series with resistor 39 and then connected to pin 47 of the driving chip. Pin 48 of the driving chip is connected in series with resistor 36 and resistor 35 and then connected to driving interface 9. Pin 50 of the driving chip is connected in series with resistor 41 and resistor 40 and then connected to driving interface 11. Pin 49 of the driving chip is connected in series with resistor 43 and resistor 44 and then connected to driving interface 12. The other end of capacitor 23, the anode of diode 2, the other end of resistor 65, and the other end of capacitor 6 are grounded.

[0011] The described driving interface one is connected to the gate of the high-side MOS transistor one of the three-phase bridge driving circuit. The driving interface two is divided into two paths and is respectively connected to the source of the high-side MOS transistor one and the drain of the low-side MOS transistor one of the three-phase bridge driving circuit. The driving interface three is connected to the gate of the low-side MOS transistor one of the three-phase bridge driving circuit. The driving interface four is divided into four paths and is respectively connected to the source of the low-side MOS transistor one, the sources of the low-side MOS transistor two, the low-side MOS transistor three, and the driving interface twelve of the three-phase bridge driving circuit. The driving interface five is connected to the gate of the high-side MOS transistor two of the three-phase bridge driving circuit. The driving interface six is divided into three paths and is respectively connected to the source of the high-side MOS transistor two, the drain of the low-side MOS transistor two, and the driving interface eight of the three-phase bridge driving circuit. The driving interface seven is connected to the gate of the low-side MOS transistor two. The driving interface nine is connected to the gate of the high-side MOS transistor three. The driving interface ten is divided into two paths and is respectively connected to the source of the high-side MOS transistor three and the drain of the low-side MOS transistor three. The driving interface eleven is connected to the gate of the low-side MOS transistor three. The drains of the high-side MOS transistor one, the high-side MOS transistor two, and the high-side MOS transistor three are connected to the 12V power supply. The sources of the low-side MOS transistor one, the low-side MOS transistor two, and the low-side MOS transistor three are grounded.

[0012] The described driving chip serial communication circuit module includes a driving chip, a resistor, an output signal terminal, an input signal terminal, a clock signal terminal, and a chip select signal terminal. The input signal terminal, the clock signal terminal, and the chip select signal terminal are sequentially connected to the 11th pin, the 13th pin, and the 12th pin of the driving chip respectively. The 10th pin of the driving chip is divided into two paths and is respectively connected to one end of the forty-ninth resistor and the output signal terminal. The other end of the forty-ninth resistor is grounded.

[0013] The described phase current acquisition and calibration circuit module includes a driver chip, resistors, capacitors, a switching triode, a power supply terminal, a voltage signal terminal 1, a voltage signal terminal 2, a reference voltage signal terminal, and four sampling interfaces. The power supply terminal is connected to the 3rd pin of the switching triode. The voltage signal terminal 1 is branched into two paths and respectively connected to one end of resistor R50 and one end of capacitor C14. The other end of resistor R50 is branched into two paths and respectively connected to one end of resistor R51 and the 1st pin of the switching triode. The other end of resistor R51 is connected to the 60th pin of the driver chip. The voltage signal terminal 2 is branched into two paths and respectively connected to one end of resistor R52 and one end of capacitor C15. The other end of resistor R52 is branched into two paths and respectively connected to one end of resistor R53 and the 2nd pin of the switching triode. The other end of resistor R53 is connected to the 58th pin of the driver chip. The reference voltage signal terminal is branched into two paths and respectively connected to one end of resistor R54 and one end of capacitor C16. The other end of resistor R54 is connected to the 59th pin of the driver chip. The 61st pin of the driver chip is branched into three paths and respectively connected to one end of capacitor C30, one end of capacitor C32, and one end of resistor R56. After the other end of resistor R56 is connected in series with resistor R55, it is connected to sampling interface 1. The 62nd pin of the driver chip is branched into three paths and respectively connected to the other end of capacitor C30, one end of capacitor C31, and one end of resistor R58. After the other end of resistor R58 is connected in series with resistor R59, it is connected to sampling interface 2. The 57th pin of the driver chip is branched into three paths and respectively connected to one end of capacitor C33, one end of capacitor C34, and one end of resistor R60. After the other end of resistor R60 is connected in series with resistor R61, it is connected to sampling interface 3. The 56th pin of the driver chip is branched into three paths and respectively connected to the other end of capacitor C33, one end of capacitor C35, and one end of resistor R63. After the other end of resistor R63 is connected in series with resistor R64, it is connected to sampling interface 4. The other ends of capacitor C14, capacitor C15, capacitor C16, capacitor C31, capacitor C32, capacitor C34, capacitor C35, the 17th pin and the 18th pin of the driver chip are grounded.

[0014] A W-phase phase current sampling resistor of the three-phase bridge drive circuit is connected in series between sampling interface 1 and sampling interface 2, and a V-phase phase current sampling resistor of the three-phase bridge drive circuit is connected in series between sampling interface 3 and sampling interface 4.

[0015] The model of the MCU is RH850U2A16, the model of the motor rotor position detection chip is TAS2142, and the model of the driver chip is TLE9183QK.

[0016] Compared with the prior art, the utility model realizes the separation of the drive circuit and the MCU by setting up the motor rotor position acquisition circuit module, the drive chip power supply circuit module, the drive chip enable circuit module, the pulse width modulation wave control circuit module, the drive chip serial communication circuit module and the phase current acquisition and calibration circuit module, which is convenient for circuit modification during subsequent debugging; the pulse width modulation wave control circuit module and the phase current acquisition and calibration circuit module are provided with drive interfaces and sampling interfaces, which are convenient for the direct connection of the drive circuit board to the three-phase bridge drive circuit of the motor, reducing the flying wire operation and improving the debugging efficiency. Brief Description of the Drawings

[0017] Figure 1 It is a circuit schematic diagram of the connection of each circuit module of the utility model with the MCU and the three-phase bridge drive circuit.

[0018] Figure 2 It is a circuit diagram of the motor rotor position acquisition circuit module of the utility model.

[0019] Figure 3 It is a circuit diagram of the drive chip power supply circuit module of the utility model.

[0020] Figure 4 It is a circuit diagram of the drive chip enable circuit module of the utility model.

[0021] Figure 5 It is a circuit diagram of the pulse width modulation wave control circuit module of the utility model.

[0022] Figure 6 It is a circuit diagram of the drive chip serial communication circuit module of the utility model.

[0023] Figure 7 It is a circuit diagram of the phase current acquisition and calibration circuit module of the utility model.

[0024] Figure 8 It is a circuit diagram of the three-phase bridge drive circuit.

[0025] Figure 9 It is a schematic diagram of the pin connection of the MCU. Detailed Embodiment

[0026] Now, the utility model will be further described in conjunction with the accompanying drawings.

[0027] See Figure 1 、 Figure 9, the utility model is a driving circuit board of a three-phase DC brushless motor, including a motor rotor position acquisition circuit module, a driving chip power supply circuit module, a driving chip enable circuit module, a pulse width modulation wave control circuit module, a driving chip serial communication circuit module, and a phase current acquisition and calibration circuit module. The motor rotor position acquisition circuit module 1 is provided with four analog signal terminals respectively connected to the 1st to 4th pins of the MCU8. The driving chip power supply circuit module 2 is provided with a 12V power supply interface, a 3.3V power supply interface, a power ground interface, and a shell ground interface. The 12V power supply interface of the driving chip power supply circuit module 2 is connected to the power supply terminal of the pulse width modulation wave control circuit module 4. The 3.3V power supply interface of the driving chip power supply circuit module 2 is connected to the power supply terminals of the motor rotor position acquisition circuit module 1 and the phase current acquisition and calibration circuit module 6. The driving chip enable circuit module 3 is provided with an enable signal terminal, a sleep signal terminal, and a safety shutdown signal terminal respectively connected to the 5th to 7th pins of the MCU8. The pulse width modulation wave control circuit module 4 is provided with six pulse width modulation terminals respectively connected to the 8th to 13th pins of the MCU8. The pulse width modulation wave control circuit module 4 is provided with twelve driving interfaces connected to the three-phase bridge driving circuit 7 to facilitate driving a three-phase motor. The driving chip serial communication circuit module 5 is provided with an output signal terminal, an input signal terminal, a clock signal terminal, and a chip select signal terminal respectively connected to the 17th to 20th pins of the MCU8. The phase current acquisition and calibration circuit module 6 is provided with a voltage signal terminal one, a voltage signal terminal two, and a reference voltage signal terminal respectively connected to the 14th to 16th pins of the MCU8. The phase current acquisition and calibration circuit module 6 is provided with four sampling interfaces respectively connected to both ends of two sampling resistors of the three-phase bridge driving circuit 7 to facilitate sampling the phase current of the three-phase motor.

[0028] See Figure 2 , the motor rotor position acquisition circuit module 1 includes a motor rotor position detection chip, capacitors, resistors, four analog signal terminals, and a power supply terminal. The power supply terminal is divided into three paths and respectively connected to the 2nd pin, 6th pin of the motor rotor position detection chip, and one end of the capacitor C1. After the 5th pin of the motor rotor position detection chip is connected in series with the resistor R2, it is divided into two paths and respectively connected to one end of the capacitor C2 and the analog signal terminal four. After the 3rd pin of the motor rotor position detection chip is connected in series with the resistor R1, it is divided into two paths and respectively connected to one end of the capacitor C4 and the analog signal terminal three. After the 7th pin of the motor rotor position detection chip is connected in series with the resistor R3, it is divided into two paths and respectively connected to one end of the capacitor C3 and the analog signal terminal two. After the 1st pin of the motor rotor position detection chip is connected in series with the resistor R4, it is divided into two paths and respectively connected to one end of the capacitor C5 and the analog signal terminal one. The other ends of the capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, the 4th pin, and the 8th pin of the motor rotor position detection chip are grounded.

[0029] Among them, the first analog signal terminal, the second analog signal terminal, the third analog signal terminal, and the fourth analog signal terminal are sequentially connected to the 1st pin, 2nd pin, 3rd pin, and 4th pin of the MCU8 respectively.

[0030] The power supply terminal accesses a 3.3V voltage from the driving chip power supply circuit module 2, passes through the 2nd pin and 6th pin of the motor rotor position detection chip, and after passing through the filtering capacitor C1, supplies power to the motor rotor position detection chip. The motor rotor position collected by the motor rotor position detection chip passes through four analog signal terminals, and respectively passes through the capacitor-resistor filtering circuits composed of resistor R2 and capacitor C2, resistor R1 and capacitor C4, resistor R3 and capacitor C3, and resistor R4 and capacitor C5, and is input to the analog-to-digital conversion module of the control circuit in the form of four-way analog signals, so that the control circuit can perform analog-to-digital conversion and then perform motor rotor position calculation.

[0031] See Figure 3 , the driving chip power supply circuit module 2 includes a driving chip, a diode, a capacitor, a resistor, an inductor, a 12V power supply interface, a 3.3V power supply interface, a power ground interface, and a shell ground interface. The 12V power supply interface is divided into three paths and is respectively connected to one end of capacitor C48, one end of inductor L22, and one end of resistor R48. The other end of capacitor C48 is connected to one end of capacitor C49. The other end of inductor L22 is divided into two paths and is respectively connected to the anode of diode D3 and one end of capacitor C26. The other end of capacitor C26 is connected to one end of capacitor C27. The cathode of diode D3 is divided into three paths and is respectively connected to one end of capacitor C46, one end of capacitor C10, and the 25th pin of the driving chip. The other end of capacitor C46 is connected to one end of capacitor C47. The other end of capacitor C10 is connected to one end of capacitor C11. The other end of resistor R48 is divided into two paths and is respectively connected to one end of capacitor C28 and the 20th pin of the driving chip. The other end of capacitor C28 is connected to one end of capacitor C29. The 3.3V power supply interface is divided into two paths and is respectively connected to one end of capacitor C9 and the 14th pin of the driving chip. The other end of capacitor C49 is grounded and connected to the shell ground interface. The other ends of capacitor C27, capacitor C47, capacitor C11, capacitor C29, capacitor C9, the 1st pin, 29th pin, 51st pin, 63rd pin, and 65th pin of the driving chip are grounded and connected to the power ground interface. The shell ground and the power ground are connected through a group of capacitors to minimize coupling interference.

[0032] The 12V power supply interface accesses a 12V voltage from the outside. After being filtered by capacitor twenty-six C26, capacitor twenty-seven C27, capacitor forty-eight C48, capacitor forty-nine C49 and inductor L22, it supplies power to the drive chip through pin 25 of the drive chip, passing through anti-reverse diode D3 and filtering capacitors forty-six C46, capacitor forty-seven C47, capacitor ten C10 and capacitor eleven C11; through pin 20 of the drive chip, after passing through the capacitor-resistor filter circuit composed of resistor forty-eight R48, capacitor twenty-eight C28 and capacitor twenty-nine C29, it supplies power to the drive chip. The 3.3V power supply interface accesses a 3.3V voltage from the control circuit and supplies power to the drive chip through pin 14 of the drive chip after passing through filtering capacitor nine C9.

[0033] See Figure 4 , the drive chip enable circuit module 3 includes a drive chip, capacitors, resistors, an enable signal terminal, a sleep signal terminal, a safety shutdown signal terminal, and a fault monitoring signal terminal. The enable signal terminal and the safety shutdown signal terminal are respectively connected to pin 64 and pin 16 of the drive chip. The sleep signal terminal is divided into two paths and is respectively connected to one end of resistor forty-five R45 and one end of resistor forty-six R46. The other end of resistor forty-six R46 is divided into two paths and is respectively connected to one end of capacitor seven C7 and pin 24 of the drive chip. Pin 3 of the drive chip is the fault monitoring signal terminal, which is used to output the fault monitoring signal to the control circuit. The other end of resistor forty-five R45 and the other end of capacitor seven C7 are grounded.

[0034] Among them, the enable signal terminal, the sleep signal terminal, and the safety shutdown signal terminal are sequentially connected to pin 5, pin 6, and pin 7 of MCU8 respectively.

[0035] The enable signal output by MCU8 is input to the drive chip through pin 64 of the drive chip for enable control, which is effective when the enable signal is at a high level; the sleep signal output by MCU8 passes through pin 24 of the drive chip, and after passing through the capacitor-resistor filter circuit composed of resistor forty-five R45, resistor forty-six R46 and capacitor seven C7, it is input to the drive chip for power-on and power-off control. When pin 24 of the drive chip is at a low level, the internal power-off program of the drive chip will start and the power supply will also be deactivated; the safety shutdown signal output by MCU8 is input to the drive chip through pin 16 of the drive chip for safety shutdown control of the MOSFET in the drive bridge circuit; the fault monitoring signal output by the drive chip is output to the control circuit through pin 3 of the drive chip. When a fault is detected, pin 3 of the drive chip will be set low, thereby feeding back the fault diagnosis result of the drive chip.

[0036] See Figure 5, the pulse width modulation wave control circuit module 4 includes a driving chip, capacitors, resistors, diodes, a power supply terminal, six pulse width modulation terminals, and twelve driving interfaces. After the power supply terminal is connected in series with resistor R66, it is divided into four paths and connected to one end of capacitor C23, pin 36, pin 40, and pin 45 of the driving chip respectively. Pulse width modulation terminal 1, pulse width modulation terminal 2, pulse width modulation terminal 3, pulse width modulation terminal 4, pulse width modulation terminal 5, and pulse width modulation terminal 6 are sequentially connected to pin 4, pin 5, pin 7, pin 6, pin 8, and pin 9 of the driving chip respectively. Pin 21 of the driving chip is connected to one end of capacitor C42. The other end of capacitor C42 is divided into two paths and connected to the cathode of diode D1 and pin 22 of the driving chip respectively. Pin 27 of the driving chip is connected to one end of capacitor C43. The other end of capacitor C43 is divided into two paths and connected to one end of resistor R65 and pin 28 of the driving chip respectively. Pin 30 of the driving chip is connected to one end of capacitor C6. After pin 33 of the driving chip is connected in series with resistor R5, resistor R20, and capacitor C39, it is divided into two paths and connected to one end of resistor R17 and driving interface 2 respectively. The other end of resistor R17 is connected in series with resistor R7 and then connected to pin 34 of the driving chip. Pin 35 of the driving chip is connected in series with resistor R6 and resistor R16 and then connected to driving interface 1. Pin 31 of the driving chip is connected in series with resistor R8 and resistor R18 and then connected to driving interface 3. Pin 32 of the driving chip is connected in series with resistor R9 and resistor R19 and then connected to driving interface 4. Pin 41 of the driving chip is connected in series with resistor R22, resistor R21, and capacitor C40, and then divided into two paths and connected to one end of resistor R26 and driving interface 6 respectively. The other end of resistor R26 is connected in series with resistor R27 and then connected to pin 42 of the driving chip. Pin 43 of the driving chip is connected in series with resistor R24 and resistor R23 and then connected to driving interface 5. Pin 38 of the driving chip is connected in series with resistor R29 and resistor R28 and then connected to driving interface 7. Pin 37 of the driving chip is connected in series with resistor R31 and resistor R32 and then connected to driving interface 8. Pin 46 of the driving chip is connected in series with resistor R34, resistor R33, and capacitor C41, and then divided into two paths and connected to one end of resistor R38 and driving interface 10 respectively. The other end of resistor R38 is connected in series with resistor R39 and then connected to pin 47 of the driving chip. Pin 48 of the driving chip is connected in series with resistor R36 and resistor R35 and then connected to driving interface 9. Pin 50 of the driving chip is connected in series with resistor R41 and resistor R40 and then connected to driving interface 11.The 49th pin of the drive chip is connected to the drive interface twelve after being serially connected with resistor forty-three R43 and resistor forty-four R44. The other end of capacitor twenty-three C23, the anode of diode two D1, the other end of resistor sixty-five R65, and the other end of capacitor six C6 are grounded.

[0037] See Figure 8 , the drive interface one is connected to the gate of the high-side MOS transistor one Q1 of the three-phase bridge drive circuit 7, the drive interface two is divided into two paths and respectively connected to the source of the high-side MOS transistor one Q1 and the drain of the low-side MOS transistor one Q2 of the three-phase bridge drive circuit 7, the drive interface three is connected to the gate of the low-side MOS transistor one Q2 of the three-phase bridge drive circuit 7, the drive interface four is divided into four paths and respectively connected to the source of the low-side MOS transistor one Q2, the source of the low-side MOS transistor two Q4, the source of the low-side MOS transistor three Q6, and the drive interface twelve, the drive interface five is connected to the gate of the high-side MOS transistor two Q3 of the three-phase bridge drive circuit 7, the drive interface six is divided into three paths and respectively connected to the source of the high-side MOS transistor two Q3, the drain of the low-side MOS transistor two Q4, and the drive interface eight, the drive interface seven is connected to the gate of the low-side MOS transistor two Q4, the drive interface nine is connected to the gate of the high-side MOS transistor three Q5, the drive interface ten is divided into two paths and respectively connected to the source of the high-side MOS transistor three Q5 and the drain of the low-side MOS transistor three Q6, the drive interface eleven is connected to the gate of the low-side MOS transistor three Q6, the drains of the high-side MOS transistor one Q1, the high-side MOS transistor two Q3, and the high-side MOS transistor three Q5 are connected to the 12V power supply, and the sources of the low-side MOS transistor one Q2, the low-side MOS transistor two Q4, and the low-side MOS transistor three Q6 are grounded.

[0038] Among them, the pulse width modulation terminal one, the pulse width modulation terminal two, the pulse width modulation terminal three, the pulse width modulation terminal four, the pulse width modulation terminal five, and the pulse width modulation terminal six are sequentially connected to the 8th pin, 9th pin, 10th pin, 11th pin, 12th pin, and 13th pin of the MCU8 respectively.

[0039] The power supply terminal accesses 12V voltage from the drive chip power supply circuit module 2, and supplies power to the three-phase bridge drive circuit 7 after passing through the capacitor-resistor filter circuit composed of resistor sixty-six R66 and capacitor twenty-three C23 through the 36th pin, 40th pin, and 45th pin of the drive chip.

[0040] The six-way pulse width modulation wave PWM signals are respectively input to the driving chip through the six pulse width modulation terminals through the No. 4 pin, the No. 5 pin, the No. 7 pin, the No. 6 pin, the No. 8 pin, and the No. 9 pin of the driving chip; the PWM signal for controlling the operation of the three-phase bridge driving circuit 7 obtained by the driving chip after calculation conversion passes through the No. 35 pin and the No. 34 pin, the No. 31 pin and the No. 32 pin, the No. 43 pin and the No. 42 pin, the No. 38 pin and the No. 37 pin, the No. 48 pin and the No. 47 pin, the No. 50 pin and the No. 49 pin, through the resistor six R6 and the resistor sixteen R16, the resistor seven R7 and the resistor seventeen R 17. After filtering, resistor eight R8 and resistor eighteen R18, resistor nine R9 and resistor nineteen R19, resistor twenty-four R24 ​​and resistor twenty-three R23, resistor twenty-seven R27 and resistor twenty-six R26, resistor twenty-nine R29 and resistor twenty-eight R28, resistor thirty-one R31 and resistor thirty-two R32, resistor thirty-six R36 and resistor thirty-five R35, resistor thirty-nine R39 and resistor thirty-eight R38, resistor forty-one R41 and resistor forty R40, resistor forty-three R43 and resistor forty-four R44 are used to drive the six MOS tubes of the three-phase bridge drive circuit 7 to turn on and off.

[0041] The bootstrap circuits of the three high-side MOS tubes of the three-phase bridge drive circuit 7 are connected to the source of the corresponding high-side MOS tube through the external bootstrap capacitor circuits composed of the 33rd pin, the 41st pin, and the 46th pin of the drive chip, respectively, through the resistor 5 R5, the resistor 20 R20 and the capacitor 39 C39, the resistor 22 R22, the resistor 21 R21 and the capacitor 40 C40, the resistor 34 R34, the resistor 33 R33 and the capacitor 41 C41. The capacitor 42 C42 and the capacitor 43 C43 are charge pump charging bootstrap capacitors, the purpose of which is to quickly turn on the high-side MOS tube.

[0042] See also Figure 6 The driver chip serial communication circuit module 5 includes a driver chip, a resistor, an output signal terminal, an input signal terminal, a clock signal terminal, and a chip select signal terminal. The input signal terminal, the clock signal terminal, and the chip select signal terminal are respectively connected to pin No. 11, pin No. 13, and pin No. 12 of the driver chip. Pin No. 10 of the driver chip is divided into two paths and is respectively connected to one end of resistor No. 49 R49 and the output signal terminal. The other end of resistor No. 49 R49 is grounded.

[0043] Among them, the output signal terminal, input signal terminal, clock signal terminal, and chip select signal terminal are respectively connected to pin No. 17, pin No. 18, pin No. 19, and pin No. 20 of MCU8 to achieve communication with MCU8.

[0044] See also Figure 7, the current acquisition and calibration circuit module 6 includes a driving chip, resistors, capacitors, switching transistors, a power supply terminal, a first voltage signal terminal, a second voltage signal terminal, a reference voltage signal terminal, and four sampling interfaces. The power supply terminal is connected to the 3rd pin of the switching transistor D8. The first voltage signal terminal is branched into two paths and respectively connected to one end of the resistor R50 and one end of the capacitor C14. The other end of the resistor R50 is branched into two paths and respectively connected to one end of the resistor R51 and the 1st pin of the switching transistor D8. The other end of the resistor R51 is connected to the 60th pin of the driving chip. The second voltage signal terminal is branched into two paths and respectively connected to one end of the resistor R52 and one end of the capacitor C15. The other end of the resistor R52 is branched into two paths and respectively connected to one end of the resistor R53 and the 2nd pin of the switching transistor D8. The other end of the resistor R53 is connected to the 58th pin of the driving chip. The reference voltage signal terminal is branched into two paths and respectively connected to one end of the resistor R54 and one end of the capacitor C16. The other end of the resistor R54 is connected to the 59th pin of the driving chip. The 61st pin of the driving chip is branched into three paths and respectively connected to one end of the capacitor C30, one end of the capacitor C32, and one end of the resistor R56. After the other end of the resistor R56 is connected in series with the resistor R55, it is connected to the first sampling interface. The 62nd pin of the driving chip is branched into three paths and respectively connected to the other end of the capacitor C30, one end of the capacitor C31, and one end of the resistor R58. After the other end of the resistor R58 is connected in series with the resistor R59, it is connected to the second sampling interface. The 57th pin of the driving chip is branched into three paths and respectively connected to one end of the capacitor C33, one end of the capacitor C34, and one end of the resistor R60. After the other end of the resistor R60 is connected in series with the resistor R61, it is connected to the third sampling interface. The 56th pin of the driving chip is branched into three paths and respectively connected to the other end of the capacitor C33, one end of the capacitor C35, and one end of the resistor R63. After the other end of the resistor R63 is connected in series with the resistor R64, it is connected to the fourth sampling interface. The other ends of the capacitors C14, C15, C16, C31, C32, C34, C35, the 17th pin and the 18th pin of the driving chip are grounded.

[0045] A W-phase phase current sampling resistor R67 of the three-phase bridge driving circuit 7 is connected in series between the first sampling interface and the second sampling interface. A V-phase phase current sampling resistor R68 of the three-phase bridge driving circuit 7 is connected in series between the third sampling interface and the fourth sampling interface.

[0046] Among them, the first voltage signal terminal, the second voltage signal terminal, and the reference voltage signal terminal are respectively connected to the 14th pin, the 15th pin, and the 16th pin of the MCU 8.

[0047] The current acquisition and calibration circuit module 6 calculates the phase current by collecting the voltages of the W-phase phase current sampling resistor R67 and the V-phase phase current sampling resistor R68, so as to achieve the purpose of closed-loop control. The positive voltage signal and the negative voltage signal of the W-phase phase current sampling resistor R67 pass through the resistor-capacitor filtering circuit composed of the resistor fifty-five R55, the resistor fifty-six R56 and the capacitor thirty-two C32 grounded respectively, and the resistor fifty-eight R58, the resistor fifty-nine R59 and the capacitor thirty-one C31 grounded respectively, and then are input to the 61st pin and the 62nd pin of the drive chip to monitor the magnitude of the W-phase phase current of the motor; the positive voltage signal and the negative voltage signal of the V-phase phase current sampling resistor R68 pass through the resistor-capacitor filtering circuit composed of the resistor sixty R60, the resistor sixty-one R61 and the capacitor thirty-four C34 grounded respectively, and the resistor sixty-three R63, the resistor sixty-four R64 and the capacitor thirty-five C35 grounded respectively, and then are input to the 57th pin and the 56th pin of the drive chip to monitor the magnitude of the V-phase phase current of the motor; the two voltage signals VO1 and VO2 calculated by the drive chip pass through the 60th pin and the 58th pin respectively, and after passing through the resistor-capacitor filtering circuit composed of the resistor fifty R50, the resistor fifty-one R51 and the capacitor fourteen C14 grounded respectively and the resistor-capacitor filtering circuit composed of the resistor fifty-two R52, the resistor fifty-three R53 and the capacitor fifteen C15 grounded respectively, are input to the MCU18. The reference voltage signal passes through the 59th pin of the drive chip, and after passing through the resistor-capacitor filtering circuit composed of the resistor fifty-four R54 and the capacitor sixteen C16 grounded respectively, is input to the MCU18. The MCU18 calculates the three-phase phase current.

[0048] The model of the MCU8 is RH850U2A16, and the model of the motor rotor position detection chip is TAS2142. The SIN and COS signals output by it can be calculated to obtain the position of the motor rotor. The model of the drive chip is TLE9183QK. After being powered by 12V and the enable signal is input, it can output the PWM signal as a signal that can drive the MOS tube, which is used to drive the three-phase motor.

[0049] By setting the motor rotor position acquisition circuit module, the drive chip power supply circuit module, the drive chip enable circuit module, the pulse width modulation wave control circuit module, the drive chip serial communication circuit module and the phase current acquisition and calibration circuit module, the present utility model realizes the separation of the drive circuit and the MCU, which is convenient for circuit modification during subsequent debugging; the pulse width modulation wave control circuit module and the phase current acquisition and calibration circuit module are provided with drive interfaces and sampling interfaces, which are convenient for the direct connection between the drive circuit board and the three-phase bridge drive circuit module of the motor, reducing the flying wire operation and improving the debugging efficiency.

Claims

1. A driving circuit board for a three-phase brushless DC motor, comprising a motor rotor position acquisition circuit module, a drive chip power supply circuit module, a drive chip enabling circuit module, a pulse width modulation wave control circuit module, a drive chip serial communication circuit module, and a phase current acquisition and calibration circuit module, characterized in that: The motor rotor position acquisition circuit module (1) is provided with four analog signal terminals respectively connected to pins 1 to 4 of the MCU (8); the driver chip power supply circuit module (2) is provided with a 12V power supply interface, a 3.3V power supply interface, a power grounding interface, and a shell grounding interface; the 12V power supply interface of the driver chip power supply circuit module (2) is connected to the power supply terminal of the pulse width modulation wave control circuit module (4); the 3.3V power supply interface of the driver chip power supply circuit module (2) is connected to the power supply terminal of the motor rotor position acquisition circuit module (1) and the power supply terminal of the phase current acquisition and calibration circuit module (6); the driver chip enable circuit module (3) is provided with an enable signal terminal, a sleep signal terminal, and a safety shutdown signal terminal respectively connected to pins 5 to 7 of the MCU (8); The pulse width modulation wave control circuit module (4) is provided with six pulse width modulation terminals respectively connected to pins 8 to 13 of the MCU (8); the pulse width modulation wave control circuit module (4) is provided with twelve drive interfaces connected to the three-phase bridge drive circuit (7); the drive chip serial communication circuit module (5) is provided with an output signal terminal, an input signal terminal, a clock signal terminal, and a chip selection signal terminal respectively connected to pins 17 to 20 of the MCU (8); the phase current acquisition and calibration circuit module (6) is provided with a voltage signal terminal 1, a voltage signal terminal 2, and a reference voltage signal terminal respectively connected to pins 14 to 16 of the MCU (8); and the phase current acquisition and calibration circuit module (6) is provided with four sampling interfaces respectively connected to two ends of two sampling resistors of the three-phase bridge drive circuit (7).

2. The driving circuit board of a three-phase brushless DC motor according to claim 1, characterized in that: The motor rotor position acquisition circuit module (1) comprises a motor rotor position detection chip, a capacitor, a resistor, four analog signal terminals, and a power supply terminal. The power supply terminal is divided into three paths and respectively connected to pin No. 2, pin No. 6, and one end of capacitor 1 (C1) of the motor rotor position detection chip. After pin No. 5 of the motor rotor position detection chip is connected in series with resistor 2 (R2), it is divided into two paths and respectively connected to one end of capacitor 2 (C2) and analog signal terminal 4. After pin No. 3 of the motor rotor position detection chip is connected in series with resistor 1 (R1), it is divided into two paths and respectively connected to one end of capacitor 4 (C4) and analog signal terminal 5 (C6). After the No. 7 pin of the motor rotor position detection chip is connected in series with resistor three (R3), it is divided into two paths and connected to one end of capacitor three (C3) and analog signal terminal two respectively. After the No. 1 pin of the motor rotor position detection chip is connected in series with resistor four (R4), it is divided into two paths and connected to one end of capacitor five (C5) and analog signal terminal one respectively. The other end of capacitor one (C1), the other end of capacitor two (C2), the other end of capacitor three (C3), the other end of capacitor four (C4), the other end of capacitor five (C5), pins 4 and 8 of the motor rotor position detection chip are grounded.

3. The driving circuit board of a three-phase brushless DC motor according to claim 1, characterized in that: The driver chip power supply circuit module (2) comprises a driver chip, a diode, a capacitor, a resistor, an inductor, a 12V power supply interface, a 3.3V power supply interface, a power grounding interface, and a shell grounding interface. The 12V power supply interface is divided into three paths, which are respectively connected to one end of capacitor 48 (C48), one end of inductor (L22), and one end of resistor 48 (R48). The other end of capacitor 48 (C48) is connected to one end of capacitor 49 (C49). The other end of inductor (L22) is divided into two paths, which are respectively connected to the anode of diode (D3) and one end of capacitor 26 (C26). The other end of capacitor 26 (C26) is connected to one end of capacitor 27 (C27). The cathode of diode (D3) is divided into three paths, which are respectively connected to one end of capacitor 46 (C46), one end of capacitor 10 (C10), and pin 25 of the driver chip. The other end of capacitor 46 (C46) is connected to capacitor 4 One end of capacitor seventeen (C47) is connected, the other end of capacitor ten (C10) is connected to one end of capacitor eleven (C11), the other end of resistor forty-eight (R48) is divided into two paths and respectively connected to one end of capacitor twenty-eight (C28) and pin 20 of the driver chip, the other end of capacitor twenty-eight (C28) is connected to one end of capacitor twenty-nine (C29), the 3.3V power supply interface is divided into two paths and respectively connected to one end of capacitor nine (C9) and pin 14 of the driver chip, the other end of capacitor forty-nine (C49) is grounded and connected to the shell grounding interface, the other end of capacitor twenty-seven (C27), the other end of capacitor forty-seven (C47), the other end of capacitor eleven (C11), the other end of capacitor twenty-nine (C29), the other end of capacitor nine (C9), pin 1, pin 29, pin 51, pin 63, and pin 65 of the driver chip are grounded and connected to the power grounding interface.

4. The driving circuit board of a three-phase brushless DC motor according to claim 1, characterized in that: The driver chip enabling circuit module (3) comprises a driver chip, a capacitor, a resistor, an enabling signal terminal, a sleep signal terminal, a safety shutdown signal terminal, and a fault monitoring signal terminal. The enabling signal terminal and the safety shutdown signal terminal are respectively connected to pin 64 and pin 16 of the driver chip. The sleep signal terminal is divided into two paths and respectively connected to one end of resistor 45 (R45) and one end of resistor 46 (R46). The other end of resistor 46 (R46) is divided into two paths and respectively connected to one end of capacitor 7 (C7) and pin 24 of the driver chip. Pin 3 of the driver chip is a fault monitoring signal terminal. The other end of resistor 45 (R45) and the other end of capacitor 7 (C7) are grounded.

5. The driving circuit board of a three-phase brushless DC motor according to claim 1, characterized in that: The pulse width modulation wave control circuit module (4) comprises a driving chip, a capacitor, a resistor, a diode, a power supply terminal, six pulse width modulation terminals, and twelve driving interfaces. After the power supply terminal is connected in series with resistor sixty-six (R66), it is divided into four paths and respectively connected to one end of capacitor twenty-three (C23), pin 36, pin 40, and pin 45 of the driving chip. The pulse width modulation terminal 1, pulse width modulation terminal 2, pulse width modulation terminal 3, pulse width modulation terminal 4, pulse width modulation terminal 5, and pulse width modulation terminal 6 are respectively connected to pin 4, pin 5, pin 7, pin 6, pin 8, and pin 9 of the driving chip. Pin 21 of the driving chip is connected to one end of capacitor forty-two (C42). The other end of capacitor forty-two (C42) is divided into two paths and respectively connected to the cathode of diode two (D1) and pin 22 of the driver chip. Pin 27 of the driver chip is connected to one end of capacitor forty-three (C43). The other end of capacitor forty-three (C43) is divided into two paths and respectively connected to one end of resistor sixty-five (R65) and pin 28 of the driver chip. Pin 30 of the driver chip is connected to one end of capacitor six (C6). Pin 33 of the driver chip is connected in series with resistor five (R5), resistor twenty (R20), and capacitor thirty-nine (C39), and then divided into two paths and respectively connected to one end of resistor seventeen (R17) and driver interface two. The other end of resistor seventeen (R17) is connected in series with resistor seven (R7) and connected to pin 34 of the driver chip. Pin connection, after connecting resistor six (R6) and resistor sixteen (R16) in series on pin 35 of the driver chip, it is connected to driver interface one, after connecting resistor eight (R8) and resistor eighteen (R18) in series on pin 31 of the driver chip, it is connected to driver interface three, after connecting resistor nine (R9) and resistor nineteen (R19) in series on pin 32 of the driver chip, it is connected to driver interface four, after connecting resistor twenty-two (R22), resistor twenty-one (R21) and capacitor forty (C40) in series on pin 41 of the driver chip, it is divided into two paths and connected to one end of resistor twenty-six (R26) and driver interface six respectively, after connecting the other end of resistor twenty-six (R26) in series with resistor twenty-seven (R27), it is connected to pin 42 of the driver chip, the driver chip Pin 43 of the driver chip is connected in series with resistor 24 (R24) and resistor 23 (R23), and then connected to drive interface 5. Pin 38 of the driver chip is connected in series with resistor 29 (R29) and resistor 28 (R28), and then connected to drive interface 7. Pin 37 of the driver chip is connected in series with resistor 31 (R31) and resistor 32 (R32), and then connected to drive interface 8. Pin 46 of the driver chip is connected in series with resistor 34 (R34), resistor 33 (R33), and capacitor 41 (C41), and then connected to one end of resistor 38 (R38) and drive interface 10 in two ways. The other end of resistor 38 (R38) is connected in series with resistor 39 (R39), and then connected to pin 47 of the driver chip.Pin 48 of the driver chip is connected in series with resistor 36 (R36) and resistor 35 (R35), and then connected to driver interface 9. Pin 50 of the driver chip is connected in series with resistor 41 (R41) and resistor 40 (R40), and then connected to driver interface 11. Pin 49 of the driver chip is connected in series with resistor 43 (R43) and resistor 44 (R44), and then connected to driver interface 12. The other end of capacitor 23 (C23), the anode of diode 2 (D1), the other end of resistor 65 (R65), and the other end of capacitor 6 (C6) are grounded.

6. The driving circuit board of a three-phase brushless DC motor according to claim 5, characterized in that: The driving interface 1 is connected to the gate of the high-side MOS tube 1 (Q1) of the three-phase bridge driving circuit (7); the driving interface 2 is divided into two paths and respectively connected to the source of the high-side MOS tube 1 (Q1) and the drain of the low-side MOS tube 1 (Q2) of the three-phase bridge driving circuit (7); the driving interface 3 is connected to the gate of the low-side MOS tube 1 (Q2) of the three-phase bridge driving circuit (7); the driving interface 4 is divided into four paths and respectively connected to the source of the low-side MOS tube 1 (Q2), the source of the low-side MOS tube 2 (Q4), the source of the low-side MOS tube 3 (Q6) and the driving interface 12 of the three-phase bridge driving circuit (7); the driving interface 5 is connected to the gate of the high-side MOS tube 2 (Q3) of the three-phase bridge driving circuit (7); the driving interface 6 is divided into three paths and respectively connected to the gate of the high-side MOS tube 2 (Q3) of the three-phase bridge driving circuit (7); The source of the high-side MOS tube 2 (Q3) of 7, the drain of the low-side MOS tube 2 (Q4), and the driving interface 8 are connected, the driving interface 7 is connected to the gate of the low-side MOS tube 2 (Q4), the driving interface 9 is connected to the gate of the high-side MOS tube 3 (Q5), the driving interface 10 is respectively connected to the source of the high-side MOS tube 3 (Q5) and the drain of the low-side MOS tube 3 (Q6), the driving interface 11 is connected to the gate of the low-side MOS tube 3 (Q6), the drain of the high-side MOS tube 1 (Q1), the drain of the high-side MOS tube 2 (Q3), and the drain of the high-side MOS tube 3 (Q5) are connected to the 12V power supply, and the source of the low-side MOS tube 1 (Q2), the source of the low-side MOS tube 2 (Q4), and the source of the low-side MOS tube 3 (Q6) are grounded.

7. The driving circuit board of a three-phase brushless DC motor according to claim 1, characterized in that: The driver chip serial communication circuit module (5) comprises a driver chip, a resistor, an output signal terminal, an input signal terminal, a clock signal terminal, and a chip select signal terminal. The input signal terminal, the clock signal terminal, and the chip select signal terminal are respectively connected to pin No. 11, pin No. 13, and pin No. 12 of the driver chip in sequence. Pin No. 10 of the driver chip is divided into two paths and is respectively connected to one end of resistor No. 49 (R49) and the output signal terminal. The other end of resistor No. 49 (R49) is grounded.

8. The driving circuit board of a three-phase brushless DC motor according to claim 1, characterized in that: The phase current acquisition and calibration circuit module (6) comprises a driving chip, a resistor, a capacitor, a switching transistor, a power supply end, a voltage signal end 1, a voltage signal end 2, a reference voltage signal end, and four sampling interfaces. The power supply end is connected to pin 3 of the switching transistor (D8). The voltage signal end 1 is divided into two paths and respectively connected to one end of a resistor fifty (R50) and one end of a capacitor fourteen (C14). The other end of the resistor fifty (R50) is divided into two paths and respectively connected to one end of a resistor fifty-one (R51) and pin 1 of the switching transistor (D8). The other end of the resistor fifty-one (R51) is connected to pin 60 of the driving chip. The voltage signal end 2 is divided into two paths and respectively connected to the resistor fifty-two ( The reference voltage signal end is connected to one end of resistor 54 (R54) and one end of capacitor 16 (C16) in two ways, and one end of capacitor 15 (C15) in three ways, and one end of capacitor 30 (C30) and one end of capacitor 32 (C32) in three ways, respectively. One end is connected, the other end of resistor fifty-six (R56) is connected in series with resistor fifty-five (R55) and then connected to sampling interface one, pin 62 of the driver chip is divided into three paths and respectively connected to the other end of capacitor thirty (C30), one end of capacitor thirty-one (C31), and one end of resistor fifty-eight (R58), the other end of resistor fifty-eight (R58) is connected in series with resistor fifty-nine (R59) and then connected to sampling interface two, pin 57 of the driver chip is divided into three paths and respectively connected to one end of capacitor thirty-three (C33), one end of capacitor thirty-four (C34), and one end of resistor sixty (R60), the other end of resistor sixty (R60) is connected in series with resistor sixty-one (R61) and then connected to sampling interface two. Sampling interface three is connected, pin 56 of the driver chip is divided into three paths and respectively connected to the other end of capacitor thirty-three (C33), one end of capacitor thirty-five (C35), and one end of resistor sixty-three (R63). The other end of resistor sixty-three (R63) is connected in series with resistor sixty-four (R64) and then connected to sampling interface four. The other end of capacitor fourteen (C14), the other end of capacitor fifteen (C15), the other end of capacitor sixteen (C16), the other end of capacitor thirty-one (C31), the other end of capacitor thirty-two (C32), the other end of capacitor thirty-four (C34), the other end of capacitor thirty-five (C35), pins 17 and 18 of the driver chip are grounded.

9. The driving circuit board of a three-phase brushless DC motor according to claim 8, characterized in that: A W-phase current sampling resistor (R67) of a three-phase bridge drive circuit (7) is connected in series between the sampling interface 1 and the sampling interface 2, and a V-phase current sampling resistor (R68) of a three-phase bridge drive circuit (7) is connected in series between the sampling interface 3 and the sampling interface 4.

10. A driving circuit board for a three-phase brushless DC motor according to claims 1 to 5, 7 to 8, characterized in that: The model of MCU (8) is RH850U2A16, the model of the motor rotor position detection chip is TAS2142, and the model of the driver chip is TLE9183QK.

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