| 摘要 |
There are provided a DC power-supply device configured to remove a DC component from an AC power supply, and an application system using the DC power-supply device. The DC power-supply device converts an AC voltage into a DC voltage to output the converted DC voltage, and includes a switching element (302, 312) configured to short-circuit an AC power supply (1) through a reactor (2), a current detector unit (3) configured to detect a current flowing from the AC power supply and output the detected AC current as current information; and a control unit (8) configured to turn the switching element on and off such that a waveform of a current represented by the current information detected by the current detector unit becomes a substantially sinusoidal wave. The control unit extracts an AC power supply frequency component contained in the DC voltage to be output, and corrects an on-off ratio of the switching element to be turned on and off in accordance with the extracted AC power supply frequency component. |
