MOTOR POWER CONTROL CIRCUIT

摘要

A motor power control circuit is provided to interrupt an overvoltage without delay through a Zener diode and a transistor when the overvoltage is applied due to increment of a DC voltage. A motor power control circuit includes a power control device and a motor control device. The power control device rectifies AC power supplied from the outside, smoothes the rectified power, and converts the smoothed power into a predetermined DC power. The motor control device includes a second switching unit(Q2) and a first switching unit(Q1). The second switching unit is turned on when an overvoltage exceeding a predetermined constant voltage is applied from the power control device. The first switching unit supplies power by being turned on when the constant voltage is applied and interrupts the power by being turned off by on-operation of the second switching unit when the overvoltage is applied. The motor control device further includes a resistor(R9) and a Zener diode(ZD1) connected between one side of a smoothing capacitor(C1) of the power control device and the second switching unit.