INVERTER DEVICE AND METHOD FOR CONTROLLING THE SAME

摘要

It is possible to provide an inverter device which can protect electronic parts of both of a battery and an inverter with a sufficient reliability. Provided also is a method for controlling the inverter device. The inverter device includes a battery (3) for power supply backup in a DC bus of the inverter separately from a power supply system and drives an AC motor (2). The inverter device includes: a voltage level judgment device (4) which detects a transient voltage of the inverter DC bus and a transient voltage of the battery; a comparison circuit (9) which compares the transient voltage of the inverter DC bus to the transient voltage of the battery; and an inverter control unit (6) which switches a reduction operation pattern of the AC motor according to a differential voltage as the comparison result obtained by the comparison circuit.