A low-cost brushless motor drive circuit with Hall sensor

Abstract

A low-cost brushless motor drive circuit with a Hall sensor includes: a circuit protection module, a power conversion module, a Hall signal conversion module, a logic processing module, a dead-time control module, a three-phase bridge drive switch module, and a three-phase bridge output module. This invention provides a simpler drive solution for BLDC motors with built-in Hall sensors, directly using the motor's own Hall signal output as the drive signal input, and enabling the motor to operate autonomously through a six-step commutation process. This invention uses a simple 3 / 8 decoder and logic controller to fix the logic output, reducing the debugging time of the microcontroller. This invention uses resistors and capacitors to adjust the dead time, preventing the upper and lower transistors of the motor from turning off simultaneously, and uses a high-current output gate to drive the fast switching of the upper and lower bridge arms. The components provided by this invention are simple and inexpensive, offering a significant price advantage.

Description

Technical Field

[0001] This invention relates to the field of circuit design technology, and specifically to a low-cost brushless motor drive circuit with a Hall sensor. Background Technology

[0002] Brushless Direct Current Motor (BLDC) drive systems boast extremely high energy conversion efficiency and exceptionally high speed capabilities. The drivers can achieve millisecond-level response times, precisely controlling the motor's speed and torque. Modern BLDC drive chips primarily employ microcontroller units (MCUs) to implement algorithms and require dedicated electronic controllers (drivers) to operate. This directly increases system complexity and initial investment costs.

[0003] Conventional BLDC driver solutions primarily employ a combination of a microcontroller and a gate driver chip. Microcontrollers are costly, and algorithm debugging is complex. Therefore, they offer limited advantages for applications such as industrial fans and water pumps. Summary of the Invention

[0004] The purpose of this invention is to provide a low-cost brushless motor drive circuit with a Hall sensor, comprising: a circuit protection module, a power conversion module, a Hall signal conversion module, a logic processing module, a dead-time control module, a three-phase bridge drive switch module, and a three-phase bridge output module.

[0005] The circuit protection module is used to provide circuit protection for the input motor power supply.

[0006] The power conversion module is used to convert the input motor power into the input power of the Hall sensor.

[0007] The Hall signal conversion module receives the Hall signal from the Hall sensor based on the input power of the Hall sensor and converts the Hall signal into a corresponding binary output signal.

[0008] The logic processing module is used to perform logical processing on the binary output signal to obtain the logically processed signal.

[0009] The dead time control module is used to control the dead time of the signal after logical processing, so as to obtain the signal after controlling the dead time.

[0010] The three-phase bridge drive switch module receives the signal after the control dead time and generates a three-phase bridge drive signal.

[0011] The three-phase bridge output module receives the three-phase bridge drive signal and generates the input signal for the three-phase lines of the motor.

[0012] Furthermore, the circuit topology of the driving circuit is shown below:

[0013] Let the input motor power supply be VCC-MOTOR and the drive circuit power supply be VCC1.

[0014] The power supply VCC1 is grounded after passing through resistors R1 and R4 in sequence.

[0015] The power supply VCC1 is connected to the -IN interface of comparator U1 after being connected in series with resistor R1, and the V- interface of comparator U1 is grounded.

[0016] The power supply VCC1 is connected in series with resistor R2 and then connected to the OUT interface of comparator U1.

[0017] The V+ interface of the comparator U1 is connected to ground via a series capacitor C1, and the V+ interface of the comparator U1 is connected to ground via a series capacitor C3. The power supply VCC1 is connected to the V+ interface of the comparator U1.

[0018] The power supply VCC1 is connected to the source of the switching transistor Q1, the drain of the switching transistor Q1 is connected to the power supply VCC-MOTOR, the gate of the switching transistor Q1 is connected to the OUT interface of the comparator U1, and the gate of the switching transistor Q1 is connected to ground after being connected in series with resistor R3.

[0019] The IN interface of the LDO module U2 is connected to ground via a series capacitor C7, and the IN interface of the LDO module U2 is connected to ground via a series capacitor C8. The power supply VCC-MOTOR is connected to the IN interface of the LDO module U2.

[0020] The GND interface of the LDO module U2 is grounded, the OUT interface of the LDO module U2 outputs power VCC2, the OUT interface of the LDO module U2 is grounded after being connected in series with capacitor C9, and the OUT interface of the LDO module U2 is grounded after being connected in series with capacitor C10.

[0021] The power supply VCC2 is connected to the G1 interface of the 3 / 8 decoder U4.

[0022] The A interface of the 38 decoder U4 is connected in series with resistor R11 and capacitor C12 and then grounded.

[0023] The A interface of the 3-8 decoder U4 is connected in series with resistor R11 and capacitor C11 before being grounded.

[0024] The power supply VCC2 is connected to the C interface of the 3 / 8 decoder U4 after being connected in series with resistor R9, the power supply VCC2 is connected to the B interface of the 3 / 8 decoder U4 after being connected in series with resistor R10, and the power supply VCC2 is connected to the A interface of the 3 / 8 decoder U4 after being connected in series with resistor R11.

[0025] The G2A#, G2B#, and GND interfaces of the 38 decoder U4 are grounded.

[0026] The VCC interface of the 3-to-8 decoder U4 is connected to ground via a series capacitor C14, and the VCC interface of the 3-to-8 decoder U4 is connected to ground via a series capacitor C17. The power supply VCC2 is connected to the VCC interface of the 3-to-8 decoder U4.

[0027] The Y1, Y2, Y3, Y4, Y5, and Y6 interfaces of the 3-to-8 decoder U4 are respectively connected to the 1A, 2A, 3A, 4A, 5A, and 6A interfaces of the inverter U8.

[0028] The GND interface of inverter U8 is grounded, the VCC interface of inverter U8 is connected to power supply VCC2, the VCC interface of inverter U8 is connected to ground after series capacitor C27, and the VCC interface of inverter U8 is connected to ground after capacitor C28.

[0029] The 1Y interface of the inverter U8 is connected to the 1A interface of the first XOR gate U5, and the 1Y interface of the inverter U8 is connected to the 2A interface of the second XOR gate U7.

[0030] The 2Y interface of the inverter U8 is connected to the 2A interface of the first XOR gate U5, and the 2Y interface of the inverter U8 is connected to the 3B interface of the first XOR gate U5.

[0031] The 3Y interface of the inverter U8 is connected to the 3A interface of the first XOR gate U5.

[0032] The 4Y interface of the inverter U8 is connected to the 4A interface of the first XOR gate U5, and the 4Y interface of the inverter U8 is connected to the 1B interface of the second XOR gate U7.

[0033] The 5Y interface of the inverter U8 is connected to the 1B interface of the first XOR gate U5.

[0034] The 6Y interface of the inverter U8 is connected to the 1A interface of the second XOR gate U7.

[0035] The Y6 interface of the 3 / 8 decoder U4 is connected to the 2B interface of the first XOR gate U5.

[0036] The Y5 interface of the 3 / 8 decoder U4 is connected to the 4B interface of the first XOR gate U5.

[0037] The Y3 interface of the 3 / 8 decoder U4 is connected to the 2B interface of the second XOR gate U7.

[0038] The GND interfaces of the first XOR gate U5 and the second XOR gate U7 are both grounded, and the VCC interfaces of the first XOR gate U5 and the second XOR gate U7 are both connected to the power supply VCC2.

[0039] The VCC interface of the first XOR gate U5 is connected to ground after series capacitor C13, and the VCC interface of the first XOR gate U5 is connected to ground after series capacitor C16.

[0040] The VCC interface of the second XOR gate U7 is connected to ground after series capacitor C23, and the VCC interface of the second XOR gate U7 is connected to ground after series capacitor C25.

[0041] The 1Y interface of the first XOR gate U5 is connected to the anode of diode D3. The anode of diode D3 is connected to the cathode of diode D3 after series resistor R12. The cathode of diode D3 is connected to the ground after series capacitor C21.

[0042] The 2Y interface of the first XOR gate U5 is connected to the cathode of diode D5. The cathode of diode D5 is connected to the anode of diode D5 after series resistor R15. The anode of diode D5 is connected to the ground after series capacitor C26.

[0043] The 3Y interface of the first XOR gate U5 is connected to the anode of diode D7. The anode of diode D7 is connected to the cathode of diode D7 after series resistor R18. The cathode of diode D7 is connected to the ground after series capacitor C31.

[0044] The 4Y interface of the first XOR gate U5 is connected to the cathode of diode D8. The cathode of diode D8 is connected to the anode of diode D8 after series resistor R21. The anode of diode D8 is connected to the ground after series capacitor C34.

[0045] The 1Y interface of the second XOR gate U7 is connected to the anode of diode D11. The anode of diode D11 is connected to the cathode of diode D11 after being connected in series with resistor R24. The cathode of diode D11 is connected to the ground after being connected in series with capacitor C35.

[0046] The 2Y interface of the second XOR gate U7 is connected to the cathode of diode D12. The cathode of diode D12 is connected to the anode of diode D12 after being connected in series with resistor R25. The anode of diode D12 is connected to ground after being connected in series with capacitor C36.

[0047] The cathode of diode D3 is connected to the INA interface of the first gate driver U3, and the anode of diode D5 is connected to the INB interface of the first gate driver U3.

[0048] The cathode of diode D7 is connected to the INA interface of the second gate driver U6, and the anode of diode D8 is connected to the INB interface of the second gate driver U6.

[0049] The cathode of diode D11 is connected to the INA interface of the third gate driver U9, and the anode of diode D12 is connected to the INB interface of the third gate driver U9.

[0050] The GND interfaces of the first gate driver U3, the second gate driver U6, and the third gate driver U9 are all grounded.

[0051] The VDO interfaces of the first gate driver U3, the second gate driver U6, and the third gate driver U9 are all connected to the power supply VCC-MOTOR.

[0052] The VDO interface of the first gate driver U3 is connected to ground after series capacitor C15, and the VDO interface of the first gate driver U3 is connected to ground after series capacitor C18.

[0053] The VDO interface of the second gate driver U6 is connected to ground after series capacitor C22, and the VDO interface of the second gate driver U6 is connected to ground after series capacitor C24.

[0054] The VDO interface of the third gate driver U9 is connected to ground after series capacitor C29, and the VDO interface of the third gate driver U9 is connected to ground after series capacitor C30.

[0055] The OUTA# interface of the first gate driver U3 is connected to the anode of diode D1, and the anode of diode D1 is connected to the cathode of diode D1 after being connected in series with resistor R6.

[0056] The OUTB# interface of the first gate driver U3 is connected to the cathode of diode D2, and the cathode of diode D2 is connected to the anode of diode D2 after being connected in series with resistor R7.

[0057] The OUTA# interface of the second gate driver U6 is connected to the anode of diode D4, and the anode of diode D4 is connected to the cathode of diode D4 after being connected in series with resistor R14.

[0058] The OUTB# interface of the second gate driver U6 is connected to the cathode of diode D6, and the cathode of diode D6 is connected to the anode of diode D6 after being connected in series with resistor R16.

[0059] The OUTA# interface of the third gate driver U9 is connected to the anode of diode D9, and the anode of diode D9 is connected to the cathode of diode D9 after being connected in series with resistor R20.

[0060] The OUTB# interface of the third gate driver U9 is connected to the cathode of diode D10, and the cathode of diode D10 is connected to the anode of diode D10 after being connected in series with resistor R22.

[0061] The cathode of diode D1 is connected to the gate of switch Q2. The gate of switch Q2 is connected to the source of switch Q2 after series resistor R5. The source of switch Q2 is connected to ground after series capacitor C4. The source of switch Q2 is connected to ground after series capacitor C5. The source of switch Q2 is connected to power supply VCC-MOTOR. The drain of switch Q2 is connected to the first output terminal J1.

[0062] The drain of the switching transistor Q2 is connected to the drain of the switching transistor Q3, the anode of the diode D2 is connected to the gate of the switching transistor Q3, the gate of the switching transistor Q3 is connected to ground after being connected in series with resistor R8, and the source of the switching transistor Q3 is connected to the +IN interface of the comparator U1.

[0063] The cathode of diode D4 is connected to the gate of switching transistor Q4. The gate of switching transistor Q4 is connected to the source of switching transistor Q4 after series resistor R13. The source of switching transistor Q4 is connected to ground after series capacitor C19. The source of switching transistor Q4 is connected to ground after series capacitor C20. The source of switching transistor Q4 is connected to power supply VCC-MOTOR. The drain of switching transistor Q4 is connected to the second output terminal J2.

[0064] The drain of the switching transistor Q4 is connected to the drain of the switching transistor Q5, the anode of the diode D6 is connected to the gate of the switching transistor Q5, the gate of the switching transistor Q5 is connected to ground via a series resistor R17, and the source of the switching transistor Q5 is connected to the +IN interface of the comparator U1.

[0065] The cathode of diode D9 is connected to the gate of switching transistor Q6. The gate of switching transistor Q6 is connected to the source of switching transistor Q6 after series with resistor R19. The source of switching transistor Q6 is connected to ground after series with capacitor C32. The source of switching transistor Q6 is connected to ground after series with capacitor C33. The source of switching transistor Q6 is connected to power supply VCC-MOTOR. The drain of switching transistor Q6 is connected to the third output terminal J3.

[0066] The drain of the switching transistor Q6 is connected to the drain of the switching transistor Q7, the anode of the diode D10 is connected to the gate of the switching transistor Q7, the gate of the switching transistor Q7 is connected to ground after being connected in series with resistor R23, and the source of the switching transistor Q7 is connected to the +IN interface of the comparator U1.

[0067] The first output terminal J1, the second output terminal J2, and the third output terminal J3 are connected to the three-phase lines of the motor.

[0068] Furthermore, the driving circuit also includes a driving circuit power supply filtering module.

[0069] The power supply filtering module of the drive circuit is used to filter the power supply VCC1 of the drive circuit.

[0070] Furthermore, the circuit topology of the power supply filtering module of the driving circuit is shown below:

[0071] The power supply VCC1 is connected in series with capacitor C2 and then grounded, and the power supply VCC1 is connected in series with capacitor C6 and then grounded.

[0072] Furthermore, the power supply VCC1 includes a 12V power supply.

[0073] Furthermore, all of the switching transistors Q1-Q7 are MOSFETs.

[0074] Furthermore, the power supply VCC2 includes a 5V power supply.

[0075] Furthermore, the A, B, and C interfaces of the 3-to-8 decoder U4 are used to receive Hall signals from the Hall sensor.

[0076] Furthermore, the drive circuit also includes a fuse.

[0077] The fuse is used to protect the drive circuit.

[0078] Furthermore, one end of the fuse F1 is grounded, and the other end is connected to the +IN interface of the comparator U1.

[0079] The technical effect of this invention is undeniable. This invention provides a simpler driving solution for BLDC motors with built-in Hall sensors, directly using the motor's own Hall signal output as the driving signal input, and enabling the motor to work automatically through a six-step commutation method.

[0080] This invention uses a simple 3 / 8 decoder and logic controller to fix the logic output, reducing the debugging time of the microcontroller.

[0081] This invention uses resistors and capacitors to adjust the dead time so that the upper and lower transistors of the motor will not be turned off at the same time, and uses a high-current output gate to drive the upper and lower bridge arms to switch quickly.

[0082] The device provided by this invention is simple and inexpensive, and has a significant price advantage. Attached Figure Description

[0083] Figure 1 This is a schematic diagram of a low-cost brushless motor drive circuit with Hall sensor.

[0084] Figure 2 A front view of the PCB for a low-cost brushless motor drive circuit with Hall sensor;

[0085] Figure 3 A PCB back view of a low-cost brushless motor drive circuit with Hall sensor;

[0086] Figure 4A front view of a low-cost brushless motor drive circuit with Hall sensor.

[0087] Figure 5 This is a back view of a low-cost brushless motor drive circuit with a Hall sensor. Detailed Implementation

[0088] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0089] Example 1:

[0090] See Figures 1 to 5 A low-cost brushless motor drive circuit with Hall sensor includes: a circuit protection module, a power conversion module, a Hall signal conversion module, a logic processing module, a dead time control module, a three-phase bridge drive switch module, and a three-phase bridge output module.

[0091] The circuit protection module is used to provide circuit protection for the input motor power supply.

[0092] The power conversion module is used to convert the input motor power into the input power of the Hall sensor.

[0093] The Hall signal conversion module receives the Hall signal from the Hall sensor based on the input power of the Hall sensor and converts the Hall signal into a corresponding binary output signal.

[0094] The logic processing module is used to perform logical processing on the binary output signal to obtain the logically processed signal.

[0095] The dead time control module is used to control the dead time of the signal after logical processing, so as to obtain the signal after controlling the dead time.

[0096] The three-phase bridge drive switch module receives the signal after the control dead time and generates a three-phase bridge drive signal.

[0097] The three-phase bridge output module receives the three-phase bridge drive signal and generates the input signal for the three-phase lines of the motor.

[0098] Example 2:

[0099] A low-cost brushless motor drive circuit with a Hall sensor is described in Embodiment 1. Further, the circuit topology of the drive circuit is shown below:

[0100] Let the input motor power supply be VCC-MOTOR and the drive circuit power supply be VCC1.

[0101] The power supply VCC1 is grounded after passing through resistors R1 and R4 in sequence.

[0102] The power supply VCC1 is connected to the -IN interface of comparator U1 after being connected in series with resistor R1, and the V- interface of comparator U1 is grounded.

[0103] The power supply VCC1 is connected in series with resistor R2 and then connected to the OUT interface of comparator U1.

[0104] The V+ interface of the comparator U1 is connected to ground via a series capacitor C1, and the V+ interface of the comparator U1 is connected to ground via a series capacitor C3. The power supply VCC1 is connected to the V+ interface of the comparator U1.

[0105] The power supply VCC1 is connected to the source of the switching transistor Q1, the drain of the switching transistor Q1 is connected to the power supply VCC-MOTOR, the gate of the switching transistor Q1 is connected to the OUT interface of the comparator U1, and the gate of the switching transistor Q1 is connected to ground after being connected in series with resistor R3.

[0106] The IN interface of the LDO module U2 is connected to ground via a series capacitor C7, and the IN interface of the LDO module U2 is connected to ground via a series capacitor C8. The power supply VCC-MOTOR is connected to the IN interface of the LDO module U2.

[0107] The GND interface of the LDO module U2 is grounded, the OUT interface of the LDO module U2 outputs power VCC2, the OUT interface of the LDO module U2 is grounded after being connected in series with capacitor C9, and the OUT interface of the LDO module U2 is grounded after being connected in series with capacitor C10.

[0108] The power supply VCC2 is connected to the G1 interface of the 3 / 8 decoder U4.

[0109] The A interface of the 38 decoder U4 is connected in series with resistor R11 and capacitor C12 and then grounded.

[0110] The A interface of the 3-8 decoder U4 is connected in series with resistor R11 and capacitor C11 before being grounded.

[0111] The power supply VCC2 is connected to the C interface of the 3 / 8 decoder U4 after being connected in series with resistor R9, the power supply VCC2 is connected to the B interface of the 3 / 8 decoder U4 after being connected in series with resistor R10, and the power supply VCC2 is connected to the A interface of the 3 / 8 decoder U4 after being connected in series with resistor R11.

[0112] The G2A#, G2B#, and GND interfaces of the 38 decoder U4 are grounded.

[0113] The VCC interface of the 3-to-8 decoder U4 is connected to ground via a series capacitor C14, and the VCC interface of the 3-to-8 decoder U4 is connected to ground via a series capacitor C17. The power supply VCC2 is connected to the VCC interface of the 3-to-8 decoder U4.

[0114] The Y1, Y2, Y3, Y4, Y5, and Y6 interfaces of the 3-to-8 decoder U4 are respectively connected to the 1A, 2A, 3A, 4A, 5A, and 6A interfaces of the inverter U8.

[0115] The GND interface of inverter U8 is grounded, the VCC interface of inverter U8 is connected to power supply VCC2, the VCC interface of inverter U8 is connected to ground after series capacitor C27, and the VCC interface of inverter U8 is connected to ground after capacitor C28.

[0116] The 1Y interface of the inverter U8 is connected to the 1A interface of the first XOR gate U5, and the 1Y interface of the inverter U8 is connected to the 2A interface of the second XOR gate U7.

[0117] The 2Y interface of the inverter U8 is connected to the 2A interface of the first XOR gate U5, and the 2Y interface of the inverter U8 is connected to the 3B interface of the first XOR gate U5.

[0118] The 3Y interface of the inverter U8 is connected to the 3A interface of the first XOR gate U5.

[0119] The 4Y interface of the inverter U8 is connected to the 4A interface of the first XOR gate U5, and the 4Y interface of the inverter U8 is connected to the 1B interface of the second XOR gate U7.

[0120] The 5Y interface of the inverter U8 is connected to the 1B interface of the first XOR gate U5.

[0121] The 6Y interface of the inverter U8 is connected to the 1A interface of the second XOR gate U7.

[0122] The Y6 interface of the 3 / 8 decoder U4 is connected to the 2B interface of the first XOR gate U5.

[0123] The Y5 interface of the 3 / 8 decoder U4 is connected to the 4B interface of the first XOR gate U5.

[0124] The Y3 interface of the 3 / 8 decoder U4 is connected to the 2B interface of the second XOR gate U7.

[0125] The GND interfaces of the first XOR gate U5 and the second XOR gate U7 are both grounded, and the VCC interfaces of the first XOR gate U5 and the second XOR gate U7 are both connected to the power supply VCC2.

[0126] The VCC interface of the first XOR gate U5 is connected to ground after series capacitor C13, and the VCC interface of the first XOR gate U5 is connected to ground after series capacitor C16.

[0127] The VCC interface of the second XOR gate U7 is connected to ground after series capacitor C23, and the VCC interface of the second XOR gate U7 is connected to ground after series capacitor C25.

[0128] The 1Y interface of the first XOR gate U5 is connected to the anode of diode D3. The anode of diode D3 is connected to the cathode of diode D3 after series resistor R12. The cathode of diode D3 is connected to the ground after series capacitor C21.

[0129] The 2Y interface of the first XOR gate U5 is connected to the cathode of diode D5. The cathode of diode D5 is connected to the anode of diode D5 after series resistor R15. The anode of diode D5 is connected to the ground after series capacitor C26.

[0130] The 3Y interface of the first XOR gate U5 is connected to the anode of diode D7. The anode of diode D7 is connected to the cathode of diode D7 after series resistor R18. The cathode of diode D7 is connected to the ground after series capacitor C31.

[0131] The 4Y interface of the first XOR gate U5 is connected to the cathode of diode D8. The cathode of diode D8 is connected to the anode of diode D8 after series resistor R21. The anode of diode D8 is connected to the ground after series capacitor C34.

[0132] The 1Y interface of the second XOR gate U7 is connected to the anode of diode D11. The anode of diode D11 is connected to the cathode of diode D11 after being connected in series with resistor R24. The cathode of diode D11 is connected to the ground after being connected in series with capacitor C35.

[0133] The 2Y interface of the second XOR gate U7 is connected to the cathode of diode D12. The cathode of diode D12 is connected to the anode of diode D12 after being connected in series with resistor R25. The anode of diode D12 is connected to ground after being connected in series with capacitor C36.

[0134] The cathode of diode D3 is connected to the INA interface of the first gate driver U3, and the anode of diode D5 is connected to the INB interface of the first gate driver U3.

[0135] The cathode of diode D7 is connected to the INA interface of the second gate driver U6, and the anode of diode D8 is connected to the INB interface of the second gate driver U6.

[0136] The cathode of diode D11 is connected to the INA interface of the third gate driver U9, and the anode of diode D12 is connected to the INB interface of the third gate driver U9.

[0137] The GND interfaces of the first gate driver U3, the second gate driver U6, and the third gate driver U9 are all grounded.

[0138] The VDO interfaces of the first gate driver U3, the second gate driver U6, and the third gate driver U9 are all connected to the power supply VCC-MOTOR.

[0139] The VDO interface of the first gate driver U3 is connected to ground after series capacitor C15, and the VDO interface of the first gate driver U3 is connected to ground after series capacitor C18.

[0140] The VDO interface of the second gate driver U6 is connected to ground after series capacitor C22, and the VDO interface of the second gate driver U6 is connected to ground after series capacitor C24.

[0141] The VDO interface of the third gate driver U9 is connected to ground after series capacitor C29, and the VDO interface of the third gate driver U9 is connected to ground after series capacitor C30.

[0142] The OUTA# interface of the first gate driver U3 is connected to the anode of diode D1, and the anode of diode D1 is connected to the cathode of diode D1 after being connected in series with resistor R6.

[0143] The OUTB# interface of the first gate driver U3 is connected to the cathode of diode D2, and the cathode of diode D2 is connected to the anode of diode D2 after being connected in series with resistor R7.

[0144] The OUTA# interface of the second gate driver U6 is connected to the anode of diode D4, and the anode of diode D4 is connected to the cathode of diode D4 after being connected in series with resistor R14.

[0145] The OUTB# interface of the second gate driver U6 is connected to the cathode of diode D6, and the cathode of diode D6 is connected to the anode of diode D6 after being connected in series with resistor R16.

[0146] The OUTA# interface of the third gate driver U9 is connected to the anode of diode D9, and the anode of diode D9 is connected to the cathode of diode D9 after being connected in series with resistor R20.

[0147] The OUTB# interface of the third gate driver U9 is connected to the cathode of diode D10, and the cathode of diode D10 is connected to the anode of diode D10 after being connected in series with resistor R22.

[0148] The cathode of diode D1 is connected to the gate of switch Q2. The gate of switch Q2 is connected to the source of switch Q2 after series resistor R5. The source of switch Q2 is connected to ground after series capacitor C4. The source of switch Q2 is connected to ground after series capacitor C5. The source of switch Q2 is connected to power supply VCC-MOTOR. The drain of switch Q2 is connected to the first output terminal J1.

[0149] The drain of the switching transistor Q2 is connected to the drain of the switching transistor Q3, the anode of the diode D2 is connected to the gate of the switching transistor Q3, the gate of the switching transistor Q3 is connected to ground after being connected in series with resistor R8, and the source of the switching transistor Q3 is connected to the +IN interface of the comparator U1.

[0150] The cathode of diode D4 is connected to the gate of switching transistor Q4. The gate of switching transistor Q4 is connected to the source of switching transistor Q4 after series resistor R13. The source of switching transistor Q4 is connected to ground after series capacitor C19. The source of switching transistor Q4 is connected to ground after series capacitor C20. The source of switching transistor Q4 is connected to power supply VCC-MOTOR. The drain of switching transistor Q4 is connected to the second output terminal J2.

[0151] The drain of the switching transistor Q4 is connected to the drain of the switching transistor Q5, the anode of the diode D6 is connected to the gate of the switching transistor Q5, the gate of the switching transistor Q5 is connected to ground via a series resistor R17, and the source of the switching transistor Q5 is connected to the +IN interface of the comparator U1.

[0152] The cathode of diode D9 is connected to the gate of switching transistor Q6. The gate of switching transistor Q6 is connected to the source of switching transistor Q6 after series with resistor R19. The source of switching transistor Q6 is connected to ground after series with capacitor C32. The source of switching transistor Q6 is connected to ground after series with capacitor C33. The source of switching transistor Q6 is connected to power supply VCC-MOTOR. The drain of switching transistor Q6 is connected to the third output terminal J3.

[0153] The drain of the switching transistor Q6 is connected to the drain of the switching transistor Q7, the anode of the diode D10 is connected to the gate of the switching transistor Q7, the gate of the switching transistor Q7 is connected to ground after being connected in series with resistor R23, and the source of the switching transistor Q7 is connected to the +IN interface of the comparator U1.

[0154] The first output terminal J1, the second output terminal J2, and the third output terminal J3 are connected to the three-phase lines of the motor.

[0155] Example 3:

[0156] A low-cost brushless motor drive circuit with a Hall sensor is provided. The main technical contents are described in any one of Embodiments 1 and 2. Furthermore, the drive circuit also includes a drive circuit power supply filtering module.

[0157] The power supply filtering module of the drive circuit is used to filter the power supply VCC1 of the drive circuit.

[0158] Example 4:

[0159] A low-cost brushless motor drive circuit with a Hall sensor is provided. The main technical details are described in any one of embodiments 1 to 3. Furthermore, the circuit topology of the power supply filtering module of the drive circuit is as follows:

[0160] The power supply VCC1 is connected in series with capacitor C2 and then grounded, and the power supply VCC1 is connected in series with capacitor C6 and then grounded.

[0161] Example 5:

[0162] A low-cost brushless motor drive circuit with Hall sensor is provided. The main technical contents are described in any one of embodiments 1 to 4. Furthermore, the power supply VCC1 includes a 12V power supply.

[0163] Example 6:

[0164] A low-cost brushless motor drive circuit with Hall sensor is provided. The main technical contents are described in any one of embodiments 1 to 5. Furthermore, the switching transistors Q1-Q7 are all MOSFETs.

[0165] Example 7:

[0166] A low-cost brushless motor drive circuit with Hall sensor is provided. The main technical contents are described in any one of embodiments 1 to 6. Furthermore, the power supply VCC2 includes a 5V power supply.

[0167] Example 8:

[0168] A low-cost brushless motor drive circuit with a Hall sensor is provided. The main technical contents are described in any one of embodiments 1 to 7. Furthermore, the A, B, and C interfaces of the 3-8 decoder U4 are used to receive the Hall signal from the Hall sensor.

[0169] Example 9:

[0170] A low-cost brushless motor drive circuit with a Hall sensor is provided. The main technical contents are described in any one of embodiments 1 to 8. Furthermore, the drive circuit also includes a fuse.

[0171] The fuse is used to protect the drive circuit.

[0172] Example 10:

[0173] A low-cost brushless motor drive circuit with Hall sensor is described in any one of embodiments 1 to 9. Further, one end of the fuse F1 is grounded and the other end is connected to the +IN interface of the comparator U1.

[0174] Example 11:

[0175] See Figures 1 to 5A low-cost brushless motor drive circuit with a Hall sensor is mainly composed of a 3 / 8 decoder (U4), an inverter (U8), XOR gates (U5, U7), gate drivers (U3, U6, U9), an LDO (U2), a comparator (U1), MOSFETs (Q1, Q2, Q3, Q4, Q5, Q6, Q7), connectors (CN1, H1), a fuse (F1), output terminals (J1, J2, J3), diodes (D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12), and resistors (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10). The circuit consists of resistors R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, and R25, and capacitors (C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33, C34, C35, and C36). A 3-to-8 decoder is used to convert the Hall signal into its corresponding binary output. Inverters and XOR gates are mainly used for logical processing of binary signals. The gate driver is mainly used to drive the upper and lower power MOSFETs of the three-phase bridge. The LDO is mainly used to power the motor's built-in Hall sensor. The fuse and comparator are mainly used for circuit protection. The diodes accelerate the turn-off of the MOSFETs and generate dead time. The output is connected to the three-phase lines of the motor. Connector CN1 is used as the power supply interface. H1 is used as the Hall sensor interface to provide the power required by the Hall sensor and to receive the ABC output. Resistors R1 and R4 form a voltage divider at the negative input of the comparator, which acts as an overcurrent protection condition. The voltage across the fuse is converted into current for comparison. If there is an overcurrent, Q1 at the output is turned off. R2 is the pull-up resistor for the output of U1. R3 is the pull-down resistor for the gate of Q1, making the initial state low voltage. R5, R13, and R19 are pull-up resistors at the front end of the upper bridge arm of the gate driver, making the initial default state of the upper bridge arm high level and the upper bridge arm off. R8, R17, and R23 are pull-down resistors at the front end of the lower bridge arm of the gate driver, making the initial default state of the lower bridge arm low level and the lower bridge arm off. R6, R7, R14, R16, R20, and R22 serve as the pre-stage resistors for the gate driver to eliminate ringing. Diodes D1, D2, D4, D6, D9, and D10 accelerate turn-off. R12, C21, R15, C26, R18, C31, R21, C34, R24, C35, R25, and C36 are paired together for dead-time control. D3, D5, D7, D8, D11, and D12 control the dead-time path for rapid turn-off. R9, R10, and R11 act as pull-up capacitors for the HALL signal output, and the remaining capacitors are filter capacitors.A 3 / 8 decoder, inverter, XOR gate, and gate driver together constitute a low-cost brushless motor drive solution with Hall sensor.

[0176] The drive circuit consists of a 3 / 8 decoder, an inverter, an XOR gate, a gate driver, and a MOSFET. The Hall signal is controlled by the 3 / 8 decoder to achieve logic control of the brushless motor's rotation.

[0177] Pull-up and pull-down resistors are added to the front end of the upper and lower bridge arms to keep the upper and lower bridge arms completely off when there is no signal.

[0178] Small resistors are added to the front ends of the upper and lower bridge arms to suppress ringing, and a high-current output is used in the gate driver to accelerate the switching speed of the MOSFETs. A dead-time circuit is added to the front end of the gate driver to prevent the upper and lower MOSFETs from conducting simultaneously.

[0179] The current protection current is set by means of a resistance wire. The resistance wire and MOSFET can be changed to match the parameters of different motors, making it more flexible.

[0180] Example 12:

[0181] See Figures 1 to 5A low-cost brushless motor drive circuit with a Hall sensor is mainly composed of a 3 / 8 decoder (U4), an inverter (U8), XOR gates (U5, U7), gate drivers (U3, U6, U9), an LDO (U2), a comparator (U1), MOSFETs (Q1, Q2, Q3, Q4, Q5, Q6, Q7), connectors (CN1, H1), a fuse (F1), output terminals (J1, J2, J3), diodes (D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12), and resistors (R1, R2, R3, R4, R5, R6, R7, R8, R9, R1). The circuit consists of R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, and R25, and capacitors (C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33, C34, and C35). A 3-to-8 decoder is used to convert the Hall signal into its corresponding binary output. Inverters and XOR gates are mainly used for logical processing of binary signals. The gate driver is mainly used to drive the upper and lower power MOSFETs of the three-phase bridge. The LDO is mainly used to power the motor's built-in Hall sensor. The fuse and comparator are mainly used for circuit protection. The diodes accelerate the turn-off of the MOSFETs and generate dead time. The output is connected to the three-phase lines of the motor. Connector CN1 is used as the power supply interface. H1 is used as the Hall sensor interface to provide the power required by the Hall sensor and to receive the ABC output. Resistors R1 and R4 form a voltage divider at the negative input of the comparator, which acts as an overcurrent protection condition. The voltage across the fuse is converted into current for comparison. If there is an overcurrent, Q1 at the output is turned off. R2 is the pull-up resistor for the output of U1. R3 is the pull-down resistor for the gate of Q1, making the initial state low voltage. R5, R13, and R19 are pull-up resistors at the front end of the upper bridge arm of the gate driver, making the initial default state of the upper bridge arm high level and the upper bridge arm off. R8, R17, and R23 are pull-down resistors at the front end of the lower bridge arm of the gate driver, making the initial default state of the lower bridge arm low level and the lower bridge arm off. R6, R7, R14, R16, R20, and R22 serve as the pre-stage resistors for the gate driver to eliminate ringing. Diodes D1, D2, D4, D6, D9, and D10 accelerate turn-off. R12, C21, R15, C26, R18, C31, R21, C34, R24, C35, R25, and C36 are paired together for dead-time control. D3, D5, D7, D8, D11, and D12 control the dead-time path for rapid turn-off. R9, R10, and R11 act as pull-up capacitors for the HALL signal output, and the remaining capacitors are filter capacitors.A 3 / 8 decoder, inverter, XOR gate, and gate driver together constitute a low-cost brushless motor drive solution with Hall sensor.

[0182] The power supply on / off control is achieved by using a fuse sampling and comparator to control the switching of the PMOS transistor.

[0183] A 3-to-8 decoder is used to analyze the Hall signal to determine the current motor position.

[0184] Inverters and XOR gates are used as logic controls to switch the upper and lower bridge arms on and off.

[0185] The upper and lower bridge arms are operated by using gate drivers to output high current and high voltage for fast action.

[0186] Example 13:

[0187] See Figures 1 to 5 A low-cost brushless motor drive circuit with Hall sensor, the main technical contents of which include:

[0188] like Figure 1 As shown, the schematic mainly consists of a 3-to-8 decoder, an inverter, two XOR gates, three gate drivers, seven MOSFETs, a comparator, a low dropout regulator module (LDO), several resistors and capacitors, and several terminals.

[0189] Working mechanism: The 3-to-8 decoder U4 has three input signal terminals A, B, and C, which receive Hall signals and convert them into a binary representation of the current position for output. Low output is active. The truth table is shown in Table 1.

[0190] Table 1 Truth Table of the 38 Decoder

[0191]

[0192] Output of inverter U8

[0193]

[0194] The truth table is shown in Table 2.

[0195] Table 2 Truth Table for Inverters

[0196]

[0197] The expressions for XOR gates U5 and U6 are:

[0198]

[0199] The truth table is shown in Table 3.

[0200] Table 3 Truth Table for XOR Gates

[0201]

[0202] The output of the gate driver corresponds to the HALL signal to switch the upper and lower bridge arms of the three phase lines. UP represents the upper logic of phase U, UN represents the lower logic of phase U, VP represents the upper logic of phase V, VN represents the lower logic of phase V, WP represents the upper logic of phase W, and WN represents the lower logic of phase W. The truth table is shown in Table 4.

[0203] Table 4 Truth Table for Gate Drivers

[0204]

[0205] Three Hall sensors are typically installed at 120° electrical angles apart. When the rotor poles (N or S) sweep across the sensors, the Hall values ​​Ha, Hb, and Hc output a high level (1) or a low level (0). These three signals combine to form a representation of the rotor's current position. The core principle of the six-step commutation of a brushless DC motor (BLDC) with Hall sensors is to use three Hall sensors (A, B, C) to detect the position of the rotor poles in real time and determine the energizing sequence of the motor's three-phase windings (U, V, W) based on the six different combinations of their output states. This generates a continuously rotating magnetic field to drive the rotor and thus the motor.

[0206] Table 5 Six-Step Commutation Table

[0207]

[0208] When using a 3x8 decoder to convert the Hall output of a BLDC motor, connecting Ha to the C input of the decoder, Hb to the B input, and Hc to the A input enables six-step commutation. Considering the abnormal states of all logic 0s if the Hall output is damaged, or all logic 1s if short-circuited, the subsequent logic of the 3x8 decoder does not use all logic 0s or all logic 1s output states. In this case, the upper and lower arms of the three-phase bridge are at their default potentials, with signals provided by pull-up or pull-down resistors, indirectly providing effective protection for the BLDC motor.

[0209] This embodiment separates the dead time adjustment, taking into account the flexibility of use. The gate driver can be matched with power MOSFETs that adapt to different voltages or currents. At the same time, the power supply is separated, and the motor speed can be adjusted by the current. For motors with different signals, only the corresponding fuse and MOSFET need to be replaced to match the motor parameters. The Hall signal interface can be provided by the microcontroller as an extended external square wave signal for flexible control, enabling more complex and precise designs, and enhancing scalability and reusability.

Claims

1. A low-cost brushless motor drive circuit with a Hall sensor, characterized in that, include: Circuit protection module, power conversion module, Hall signal conversion module, logic processing module, dead time control module, three-phase bridge drive switch module, three-phase bridge output module; The circuit protection module is used to protect the input motor power supply. The power conversion module is used to convert the input motor power into the input power of the Hall sensor; The Hall signal conversion module receives the Hall signal from the Hall sensor based on the input power of the Hall sensor and converts the Hall signal into a corresponding binary output signal. The logic processing module is used to perform logical processing on the binary output signal to obtain the logically processed signal. The dead time control module is used to control the dead time of the signal after logic processing, so as to obtain the signal after controlling the dead time. The three-phase bridge drive switch module receives the signal after the control dead time and generates a three-phase bridge drive signal. The three-phase bridge output module receives the three-phase bridge drive signal and generates the input signal for the three-phase lines of the motor.

2. The low-cost brushless motor drive circuit with Hall sensor according to claim 1, characterized in that, The circuit topology of the driving circuit is shown below: Let the input motor power supply be VCC-MOTOR and the drive circuit power supply be VCC1; The power supply VCC1 is grounded after passing through resistors R1 and R4 in sequence. The power supply VCC1 is connected to the -IN interface of comparator U1 after being connected in series with resistor R1, and the V- interface of comparator U1 is grounded. The power supply VCC1 is connected to the OUT interface of comparator U1 after being connected in series with resistor R2. The V+ interface of the comparator U1 is connected to ground after being connected in series with capacitor C1, and the V+ interface of the comparator U1 is connected to ground after being connected in series with capacitor C3. The power supply VCC1 is connected to the V+ interface of the comparator U1. The power supply VCC1 is connected to the source of the switching transistor Q1, the drain of the switching transistor Q1 is connected to the power supply VCC-MOTOR, the gate of the switching transistor Q1 is connected to the OUT interface of the comparator U1, and the gate of the switching transistor Q1 is connected to ground after being connected in series with resistor R3. The IN interface of the LDO module U2 is connected to ground via a series capacitor C7, and the IN interface of the LDO module U2 is connected to ground via a series capacitor C8. The power supply VCC-MOTOR is connected to the IN interface of the LDO module U2. The GND interface of the LDO module U2 is grounded, the OUT interface of the LDO module U2 outputs power VCC2, the OUT interface of the LDO module U2 is grounded after being connected in series with capacitor C9, and the OUT interface of the LDO module U2 is grounded after being connected in series with capacitor C10. The power supply VCC2 is connected to the G1 interface of the 3 / 8 decoder U4; The A interface of the 3 / 8 decoder U4 is connected to ground after a resistor R11 and a capacitor C12 are connected in series. The A interface of the 3 / 8 decoder U4 is connected to ground after a resistor R11 and a capacitor C11 are connected in series. The power supply VCC2 is connected to the C interface of the 3-to-8 decoder U4 after series resistor R9, the power supply VCC2 is connected to the B interface of the 3-to-8 decoder U4 after series resistor R10, and the power supply VCC2 is connected to the A interface of the 3-to-8 decoder U4 after series resistor R11. The G2A#, G2B#, and GND interfaces of the 3 / 8 decoder U4 are grounded; The VCC interface of the 3-to-8 decoder U4 is connected to ground via a series capacitor C14, and the VCC interface of the 3-to-8 decoder U4 is connected to ground via a series capacitor C17. The power supply VCC2 is connected to the VCC interface of the 3-to-8 decoder U4. The Y1, Y2, Y3, Y4, Y5, and Y6 interfaces of the 3-to-8 decoder U4 are respectively connected to the 1A, 2A, 3A, 4A, 5A, and 6A interfaces of the inverter U8; The GND interface of inverter U8 is grounded, the VCC interface of inverter U8 is connected to power supply VCC2, the VCC interface of inverter U8 is connected to ground after series capacitor C27, and the VCC interface of inverter U8 is connected to ground after capacitor C28. The 1Y interface of the inverter U8 is connected to the 1A interface of the first XOR gate U5, and the 1Y interface of the inverter U8 is connected to the 2A interface of the second XOR gate U7. The 2Y interface of the inverter U8 is connected to the 2A interface of the first XOR gate U5, and the 2Y interface of the inverter U8 is connected to the 3B interface of the first XOR gate U5. The 3Y interface of the inverter U8 is connected to the 3A interface of the first XOR gate U5; The 4Y interface of the inverter U8 is connected to the 4A interface of the first XOR gate U5, and the 4Y interface of the inverter U8 is connected to the 1B interface of the second XOR gate U7. The 5Y interface of the inverter U8 is connected to the 1B interface of the first XOR gate U5; The 6Y interface of the inverter U8 is connected to the 1A interface of the second XOR gate U7; The Y6 interface of the 3 / 8 decoder U4 is connected to the 2B interface of the first XOR gate U5; The Y5 interface of the 3 / 8 decoder U4 is connected to the 4B interface of the first XOR gate U5; The Y3 interface of the 3-to-8 decoder U4 is connected to the 2B interface of the second XOR gate U7; The GND interfaces of the first XOR gate U5 and the second XOR gate U7 are both grounded, and the VCC interfaces of the first XOR gate U5 and the second XOR gate U7 are both connected to the power supply VCC2. The VCC interface of the first XOR gate U5 is connected to ground after series capacitor C13, and the VCC interface of the first XOR gate U5 is connected to ground after series capacitor C16. The VCC interface of the second XOR gate U7 is connected to ground after series capacitor C23, and the VCC interface of the second XOR gate U7 is connected to ground after series capacitor C25. The 1Y interface of the first XOR gate U5 is connected to the anode of diode D3. The anode of diode D3 is connected to the cathode of diode D3 after series resistor R12. The cathode of diode D3 is connected to the ground after series capacitor C21. The 2Y interface of the first XOR gate U5 is connected to the cathode of diode D5. The cathode of diode D5 is connected to the anode of diode D5 after series resistor R15. The anode of diode D5 is connected to the ground after series capacitor C26. The 3Y interface of the first XOR gate U5 is connected to the anode of diode D7. The anode of diode D7 is connected to the cathode of diode D7 after series resistor R18. The cathode of diode D7 is connected to the ground after series capacitor C31. The 4Y interface of the first XOR gate U5 is connected to the cathode of diode D8. The cathode of diode D8 is connected to the anode of diode D8 after series resistor R21. The anode of diode D8 is connected to the ground after series capacitor C34. The 1Y interface of the second XOR gate U7 is connected to the anode of diode D11. The anode of diode D11 is connected to the cathode of diode D11 after series resistor R24. The cathode of diode D11 is connected to the ground after series capacitor C35. The 2Y interface of the second XOR gate U7 is connected to the cathode of diode D12. The cathode of diode D12 is connected to the anode of diode D12 after being connected in series with resistor R25. The anode of diode D12 is connected to the ground after being connected in series with capacitor C36. The cathode of diode D3 is connected to the INA interface of the first gate driver U3, and the anode of diode D5 is connected to the INB interface of the first gate driver U3. The cathode of diode D7 is connected to the INA interface of the second gate driver U6, and the anode of diode D8 is connected to the INB interface of the second gate driver U6. The cathode of diode D11 is connected to the INA interface of the third gate driver U9, and the anode of diode D12 is connected to the INB interface of the third gate driver U9. The GND interfaces of the first gate driver U3, the second gate driver U6, and the third gate driver U9 are all grounded; The VDO interfaces of the first gate driver U3, the second gate driver U6, and the third gate driver U9 are all connected to the power supply VCC-MOTOR; The VDO interface of the first gate driver U3 is connected to ground after series capacitor C15, and the VDO interface of the first gate driver U3 is connected to ground after series capacitor C18. The VDO interface of the second gate driver U6 is connected to ground after series capacitor C22, and the VDO interface of the second gate driver U6 is connected to ground after series capacitor C24. The VDO interface of the third gate driver U9 is connected to ground after series capacitor C29, and the VDO interface of the third gate driver U9 is connected to ground after series capacitor C30. The OUTA# interface of the first gate driver U3 is connected to the anode of diode D1, and the anode of diode D1 is connected to the cathode of diode D1 after being connected in series with resistor R6. The OUTB# interface of the first gate driver U3 is connected to the cathode of diode D2, and the cathode of diode D2 is connected to the anode of diode D2 after being connected in series with resistor R7. The OUTA# interface of the second gate driver U6 is connected to the anode of diode D4, and the anode of diode D4 is connected to the cathode of diode D4 after being connected in series with resistor R14. The OUTB# interface of the second gate driver U6 is connected to the cathode of diode D6, and the cathode of diode D6 is connected to the anode of diode D6 after being connected in series with resistor R16. The OUTA# interface of the third gate driver U9 is connected to the anode of diode D9, and the anode of diode D9 is connected to the cathode of diode D9 after being connected in series with resistor R20. The OUTB# interface of the third gate driver U9 is connected to the cathode of diode D10, and the cathode of diode D10 is connected to the anode of diode D10 after being connected in series with resistor R22. The cathode of diode D1 is connected to the gate of switch Q2. The gate of switch Q2 is connected to the source of switch Q2 after series resistor R5. The source of switch Q2 is connected to ground after series capacitor C4. The source of switch Q2 is connected to ground after series capacitor C5. The source of switch Q2 is connected to power supply VCC-MOTOR. The drain of switch Q2 is connected to the first output terminal J1. The drain of the switching transistor Q2 is connected to the drain of the switching transistor Q3, the anode of the diode D2 is connected to the gate of the switching transistor Q3, the gate of the switching transistor Q3 is connected to ground after being connected in series with resistor R8, and the source of the switching transistor Q3 is connected to the +IN interface of the comparator U1. The cathode of diode D4 is connected to the gate of switch Q4. The gate of switch Q4 is connected to the source of switch Q4 after series resistor R13. The source of switch Q4 is connected to ground after series capacitor C19. The source of switch Q4 is connected to ground after series capacitor C20. The source of switch Q4 is connected to power supply VCC-MOTOR. The drain of switch Q4 is connected to the second output terminal J2. The drain of the switching transistor Q4 is connected to the drain of the switching transistor Q5, the anode of the diode D6 is connected to the gate of the switching transistor Q5, the gate of the switching transistor Q5 is connected to ground after being connected in series with resistor R17, and the source of the switching transistor Q5 is connected to the +IN interface of the comparator U1. The cathode of diode D9 is connected to the gate of switch Q6. The gate of switch Q6 is connected to the source of switch Q6 after series with resistor R19. The source of switch Q6 is connected to ground after series with capacitor C32. The source of switch Q6 is connected to ground after series with capacitor C33. The source of switch Q6 is connected to power supply VCC-MOTOR. The drain of switch Q6 is connected to the third output terminal J3. The drain of the switching transistor Q6 is connected to the drain of the switching transistor Q7, the anode of the diode D10 is connected to the gate of the switching transistor Q7, the gate of the switching transistor Q7 is connected to ground after being connected in series with resistor R23, and the source of the switching transistor Q7 is connected to the +IN interface of the comparator U1. The first output terminal J1, the second output terminal J2, and the third output terminal J3 are connected to the three-phase lines of the motor.

3. The low-cost brushless motor drive circuit with Hall sensor according to claim 2, characterized in that, The driving circuit also includes a driving circuit power supply filtering module; The power supply filtering module of the drive circuit is used to filter the power supply VCC1 of the drive circuit.

4. The low-cost brushless motor drive circuit with Hall sensor according to claim 3, characterized in that, The circuit topology of the power supply filtering module of the drive circuit is shown below: The power supply VCC1 is connected in series with capacitor C2 and then grounded, and the power supply VCC1 is connected in series with capacitor C6 and then grounded.

5. A low-cost brushless motor drive circuit with Hall sensor according to claim 4, characterized in that, The power supply VCC1 includes a 12V power supply.

6. A low-cost brushless motor drive circuit with Hall sensor according to claim 2, characterized in that, The switching transistors Q1-Q7 are all MOSFETs.

7. A low-cost brushless motor drive circuit with Hall sensor according to claim 2, characterized in that, The power supply VCC2 includes a 5V power supply.

8. A low-cost brushless motor drive circuit with Hall sensor according to claim 2, characterized in that, The A, B, and C interfaces of the 3-to-8 decoder U4 are used to receive Hall signals from the Hall sensor.

9. A low-cost brushless motor drive circuit with Hall sensor according to claim 2, characterized in that, The drive circuit also includes a fuse; The fuse is used to protect the drive circuit.

10. A low-cost brushless motor drive circuit with Hall sensor according to claim 9, characterized in that, One end of the fuse F1 is grounded, and the other end is connected to the +IN interface of the comparator U1.

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