To achieve efficiency improvement, power-factor improvement, and resolution of high-frequency problems at a high level.
A DC power-supply device 11A includes: first and second rectifier circuits 17a and 17b converting AC power from an AC power supply 13 into DC power; a reactor 15 connected to the first and second rectifier circuits 17a and 17b; a switching section 19 short-circuiting the AC power supply 13 via the reactor 15; an input-current acquisition section 27 acquiring a current from the AC power supply 13; an input-voltage acquisition section 25 acquiring a voltage across the AC power supply 13; a DC-output-voltage acquisition section 31 acquiring a DC output voltage across the first and second rectifier circuits 17a and 17b; and a switching control section 43 determining a short-circuit time width of the switching section 19 on the basis of a short-circuit timing of the switching section 19, the DC output voltage, the voltage across the AC power supply 13, and information of the current from the AC power supply.
TAMURA MASAHIRO
TAMURA KENJI
TSUKII KOJI
IWAKI TOSHIAKI
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Etsuo Tada