Electric compressor control device

An electric compressor control device that controls a the electric compressor that has a motor mounted in a vehicle, comprising:

• an interlock loop annexed to a connector for connecting the electric compressor to a high-voltage power supply,
• an inverter output circuit that converts DC power supplied from the high-voltage power supply to AC power to drive the motor;
• a smoothing capacitor connected between the inverter output circuit and the connector,
• a voltage detection device that detects a voltage between a power line and a ground line of the connector,
• wherein the control device detects connection/disconnection of the connector on the basis of a state of the interlock loop, and in the case where disconnection of the connector is detected, the control device implements a forced discharge operation by controlling the inverter output circuit so as to forcibly discharge, through a winding of the motor, the residual charge accumulated in the smoothing capacitor,
• wherein on the basis of an output of the voltage detection device, the control device starts again the forced discharge operation by changing the discharge route in the case where a voltage between the power line and the ground line does not drop to a predetermined value even after the forced discharge operation is implemented.