Patent ID: 9692332
Date: 2017-06-27
CPC Classifications: H02M,H02P,Y02B

Claim:
1. A power conversion device which supplies power to a motor having phases and included in an air conditioner, the power conversion device comprising: an inverter circuit including: a detection circuit connected to the connection node, and configured to detect an induced voltage, of the motor before activation, in at least one of the phases in the motor; and a switching controller capable of activating the motor, by controlling ON and OFF of the upper-arm switching element and the lower-arm switching element, in accordance with a result of the detection by the detection circuit, the switching controller being configured to perform switching control causing at least one of lower-arm switching elements, including the lower-arm switching element corresponding to the one phase intended for the detection of the induced voltage, to alternately turn ON and OFF, at a predetermined frequency higher than a frequency of the induced voltage, when the detection circuit detects the induced voltage.