Patent ID: 9692312
Date: 2017-06-27
CPC Classifications: F24F,F25B,H02M,H02P,Y02B

Claim:
1. A power conversion apparatus comprising: a rectifier configured to rectify an alternating-current voltage supplied from an alternating-current power supply; a converter including a reactor connected to an output terminal of the rectifier, a reverse current prevention element connected in series with the reactor, and a switching element connected between the reactor and the reverse current prevention element, and configured to raise a rectified voltage rectified by the rectifier and output the rectified voltage as an output voltage; a smoothing capacitor configured to smooth the output voltage output from the converter; a current detector configured to detect a reactor current flowing to the reactor; a voltage detector configured to detect the output voltage output from the converter; and a converter control unit configured to control operation of the switching element of the converter, wherein the converter control unit includes a switching command calculation unit configured to calculate a switching command value responsive to a ratio of the rectified voltage to the output voltage in accordance with the output voltage detected by the voltage detector and the reactor current detected by the current detector, a switching control unit configured to control operation of the switching element in accordance with the switching command value calculated by the switching command calculation unit, and a supply abnormality determination unit configured to determine occurrence of a momentary power failure or a momentary voltage sag in accordance with the switching command value, wherein, when the supply abnormality determination unit determines that a momentary power failure or a momentary voltage sag has occurred, the switching command calculation unit outputs a preset restriction switching command value, and wherein the switching control unit controls driving of the switching element in accordance with the restriction switching command value.