| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC power supply device that can adjust the imbalance of a three-phase AC power supply. SOLUTION: The device is provided with: the three-phase AC power supply 1; a bridge rectifying circuit 3; a smoothing capacitor 4; a reactor 2 connected to the three-phase AC power supply 1; a capacitor 7 connected between AC input terminals and DC output terminals of respective phases in the bridge rectifying circuit 3 via a bidirectional switch 6; a zero-cross detection means 8 that detects the zero point of the voltage in the three-phase AC power supply 1; a DC voltage detection means 9 that detects DC voltages at both ends of the smoothing capacitor 4; a phase voltage detection means 11 that detects the voltage values of the respective phases of the three-phase AC power supply 1; a phase current detection means 12 that detects the current values of the respective phases of the three-phase AC power supply 1; a control signal correction means 13 that adjusts the control signal based on the outputs of the phase voltage detection means 11 and the phase current detection means 12; and a bidirectional switch control means 10 that drives the bidirectional switch 6, based on the signal of the control signal correction means 13. Thus, the unbalance of the three-phase AC power supply 1 can be adjusted. COPYRIGHT: (C)2007,JPO&INPIT
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