POWER CONVERSION DEVICE AND MOTOR DRIVE DEVICE, FAN, AND COMPRESSOR EACH PROVIDED WITH SAME, AND AIR-CONDITIONING MACHINE, REFRIGERATOR, AND FREEZING MACHINE EACH PROVIDED WITH FAN AND/OR COMPRESSOR

摘要

A power conversion device is provided with: an inverter 4a for driving a motor 5a by using a first carrier signal fc_a; an inverter 4b connected in parallel with the inverter 4a and driving a motor 5b by using a second carrier signal fc_b; respective phase lower-arm shunt resistors 441a, 442a, 443a for detecting first currents flowing through the inverter 4a; respective phase lower-arm shunt resistors 441b, 442b, 443b for detecting second currents flowing through the inverter 4b; and a control unit 7 for controlling the inverters 4a, 4b. When controlling the inverters 4a, 4b, a phase difference is set between the first carrier signal fc_a and the second carrier signal fc_b so that the detection periods of the first currents in the first carrier signal fc_a and the detection periods of the second currents in the second carrier signal fc_b are not overlapped with each other.