Patent ID: 8456866

Claim:
A power conversion device comprising: an inverter circuit which converts DC power into AC power and which includes a plurality of switching devices constituting an upper arm and a lower arm; a control circuit which controls the plurality of switching devices; a drive circuit which drives the plurality of switching devices based on a signal from the control circuit; and a power supply circuit which supplies power to the drive circuit; wherein: the control circuit controls a power supply voltage to be outputted from the power supply circuit to the drive circuit; the drive circuit drives the plurality of switching devices based on a carrier frequency and the power supply voltage; the power supply circuit includes a transformer and a feedback output circuit, the transformer including a primary coil to which a voltage is supplied from a battery, and a plurality of secondary coils to which voltages are supplied through the primary coil respectively; among the secondary coils, a first secondary coil outputs a voltage to the drive circuit; among the secondary coils, a second secondary coil outputs a voltage to the feedback output circuit; and the feedback output circuit includes a dummy load circuit which controls the voltage to be outputted to the primary coil based on a change of the carrier frequency.