2.1 Interfaces

  • Main power supply input and output: All circuits on the driver board and the control board are powered by the main power supply. As mentioned in the Overview, the input interface is used to receive the main power supply while the output interface is used to transmit the main power supply.

    The rated voltage of the main power supply is DC 24V ~ 48V.

  • Driver power supply input: On the control board, a DC/DC takes in the main power supply and generates the power supply of the MOSFET driver circuit. This power supply is DC 12V and transmitted to the driver board through the driver power supply input interface.
  • PWM input: The motor control PWM signals generated by the control board are received by the PWM input interface.
  • DC bus voltage output: The DC bus voltage is transmitted to the control board through this output interface. The DC bus voltage is then sampled on the control board for control of the motor, or for diagnostic purposes. Moreover, the DC bus voltage of the mandatory driver board is used as the power supply for all control circuits.
  • Back EMF output: The output voltages of the three half-bridges on the driver board are transmitted through the back EMF output interface. This signal can be used by some motor control applications, such as zero-crossing point detection.
  • Motor power output: This interface is used to connect the motor power lines.
  • Phase current sample output: Each phase current is sampled by a shunt resistor at the lower bridge arm and transmitted by the phase current sample output interface. The sample signals are used by the control board to obtain current feedback information.
  • DC bus current sample output: The lower side DC bus current is sampled by a shunt resistor and transmitted by the DC bus current sample output interface. The sample signal can be used to reconstruct the phase currents of the motor, or to trigger the over-current event.