drive

  • The CPU port is connected to the controller.On the one hand to provide U, V,W PWM control signal,.On the one hand, the motor encoder signal, phase current, phase voltage, feedback to the CPU controller. And do a good job of signal isolation operation, weak current control strong current common operation.

Brushless motor encoder

1.1 Driver – encoder part

  • HU: The input of Motor_EA_HU encoder is output to the controller by optical coupling isolation
  • HV: Motor_EA_HV encoder input is output to the controller by optical coupling isolation
  • HW: Motor_EA_HW encoder input is output to the controller by optical coupler isolation

  • Corresponding to J4 in the figure above, the encoded signal is converted into HU, HV/HW on the driver after photoelectric isolation

1.2 CPU controller – Encoder part

1.3 Motor linewithBrushless motor drive plateThe connection(Encoder signal HIU/HIV/HIW input, strong electric drive U/V/W output)

1.4 The CPU controllerwithBrushless motor drive plateConnection (Weak current controls strong current)

  • HU: The input of Motor_EA_HU encoder is output to the controller by optical coupling isolation
  • HV: Motor_EA_HV encoder input is output to the controller by optical coupling isolation
  • HW: Motor_EA_HW encoder input is output to the controller by optical coupler isolation
  • U+:Motor_U+ controller output signal, then, the drive board on the first optocoupler isolation, and then output to the MOS driver (IR2110STRPBF)
  • U-:Motor_U- Controller output signal, then, the drive board on the first optocoupler isolation, then output to the MOS driver (IR2110STRPBF)
  • V+:Motor_V+ controller output signal, then, the drive board on the first optocoupler isolation, then output to the MOS driver (IR2110STRPBF)
  • V-:Motor_V- controller output signal, then, the drive board on the first optocoupler isolation, then output to the MOS driver (IR2110STRPBF)
  • W+:Motor_W+ controller output signal, then, the drive board on the first optocoupler isolation, and then output to the MOS driver (IR2110STRPBF)
  • V-:Motor_V- controller output signal, then, the drive board on the first optocoupler isolation, then output to the MOS driver (IR2110STRPBF)

2 Strong electric drive U/V/W output

2.1 the corresponding

  • The CPU controller

  • Brushless motor drive plate

2.2 CPU Controller Input Signal Isolation (Motor_U+/Motor_U-)

2.3 Full bridge drive

  • U are the bridge

  • V phase bridge

  • W phase bridge

3 sampling circuit design

3.1 Partial voltage sampling of electromotive force

3.2 Current Sampling

4 Isolation circuit

4.1 U phase emf isolation

4.2 Power supply voltage detection and isolation