POWER CONVERSION DEVICE

Provided is a power conversion device which can ensure a suitable operational voltage for a drive unit and a voltage detection unit of each unit converter of a multilevel converter, and which can thereby simplify the configuration and lower the cost of the device.Each unit converter of the multilevel converter includes first and second output terminals, a plurality of switch elements, a capacitor connected to the first and second output terminals via the switch elements, a drive unit which is actuated by the voltage of the capacitor and drives the individual switch elements on/off in accordance with a drive signal from a control unit, and a voltage detection unit which is actuated by an operational voltage output from a power supply unit for control of the control unit and detects the voltage of the capacitor. A plurality of levels of direct-current voltages are output by the selective formation of a plurality of conduction paths created by on/off of the individual switch elements. The control unit outputs the drive signal to the drive unit on the basis of a detection result of the voltage detection unit of each unit converter.