POWER CONVERSION APPARATUS, MOTOR DRIVE APPARATUS, AND REFRIGERATING AND AIR-CONDITIONING APPARATUS

摘要

A power conversion apparatus includes: a three phase AC reactor that is connected to a three phase AC power supply; a three phase diode bridge; a plurality of smoothing capacitors that are mutually connected in series; bidirectional power switches provided between the AC input side of the three phase diode bridge and an intermediate point of the plurality of smoothing capacitors; and a controller that controls the bidirectional power switches. The controller makes the bidirectional power switch corresponding to the phase of the three phase AC power supply at intermediate electrical potential perform its switching operation for a predetermined interval.