Protection circuit of drive system for motor

摘要

A grounded terminal of a motor driver for controlling an actuator motor is connected to a ground terminal of a control unit through a grounded wire, and therefore connected to a grounded point. Since a ground wire of the stabilized power supply circuit is connected to the ground wire of the control unit, the stabilized power-supply circuit also has its ground connected with the grounded point disposed outside the control unit. A cut-wire avoidance diode is connected between the ground wire of the stabilized power supply circuit and a power transistor unit in a manner such that its cathode is connected to the power transistor unit, which enables the stabilized power-supply circuit to remain grounded even when the control unit is disconnected from the grounded point.