DC POWER-SUPPLY DEVICE AND REFRIGERATION-CYCLE APPLICATION DEVICE INCLUDING THE SAME

摘要

The DC power-supply device includes a rectifier circuit rectifying an alternating current, a reactor connected to an input or output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, and a charging unit that selectively charges one or both of the first capacitor and the second capacitor. A ratio, to a period obtained by combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor, of the non-charging period, is controlled according to an operating condition of the load, to change a charging frequency of the first capacitor and the second capacitor based on the ratio, at the time of controlling an output voltage to the load.

主权项

1. A DC power-supply device that converts an alternating current into a direct current and supplies the direct current to a load while having a reactor on a conversion path thereof, the DC power-supply device comprising:
a first capacitor and a second capacitor serially connected between output terminals to the load; a charging unit to selectively charge one or both of the first capacitor and the second capacitor; and a control unit to control the charging unit to change a charging frequency based on a ratio, to a period obtained by combining a charging period and a non-charging period when a pair of the first capacitor and the second capacitor is charged, of the non-charging period, the charging frequency being, an inverse number of the period obtained by combining the charging period and the non-charging period, and thereby to control an output voltage to the load.