Patent ID: 9614456
Date: 2017-04-04
CPC Classifications: H02M,H02P

Claim:
1. A power conversion apparatus, comprising: a rectifier for rectifying an AC voltage supplied from an AC power supply; a first smoothing capacitor and a second smoothing capacitor connected in parallel to each other, and configured to smooth an output from the rectifier and charge thereof; an inrush current preventing circuit connected in series to the first smoothing capacitor, the inrush current preventing circuit including a second relay connected in series to the second smoothing capacitor; an inverter circuit configured to convert the output smoothed by the first smoothing capacitor and the second smoothing capacitor into an AC voltage and output the AC voltage to a load; an interphase voltage detecting device configured to detect an interphase voltage of the AC voltage supplied from the AC power supply, which is caused based on a state of the load; a transformer unit arranged between the rectifier and each of the first smoothing capacitor and the second smoothing capacitor, and configured to transform a voltage output from the rectifier based on the state of the load and output the voltage; and a relay controller configured to control a switching operation of each of the first relay and the second relay, the relay controller being configured to