| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC power supply device that inexpensively implements higher efficiency.SOLUTION: The DC power supply device includes: three or more reactors 3 connected to an output terminal of a rectifier 2 for rectifying an AC voltage of an AC power supply 1 to a DC voltage; a capacitor 6 connected to each reactor 3 via a diode 5 to smooth DC power; three or more switch elements 4 connected to the respective reactors 3 to form power short circuit paths via the rectifier 2; and control means 10 for generating operation signals to operate the switch elements with different phase differences on the basis of a single carrier and a plurality of modulation waves. The operation signal for each switch element 4 is generated to an operating frequency of the three or more switch elements on the basis of a pseudo carrier whose frequency is the frequency of the carrier times the number of switch elements. The control means 10 generates the operation signal by changing on and off conditions of the signal in periods of different waveform rise/fall relations between the carrier and the pseudo carrier. |
