| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable output voltage power unit which enables the control of harmonic waves while maintaining high power factor in simple constitution. SOLUTION: This power unit is equipped with an AC power source 1, a bridge rectifying circuit 6 which is made of four pieces of diodes 2-5 that rectify the full waves of the AC from the AC power source 1, a reactor 8 which is connected between the AC power source 1 and the AC input end 6a of the above bridge rectifying circuit 6, a capacitor 10 which is connected between an AC input end 6b and a DC output end 6d via a bidirectional switch 9, a smoothing capacitor 7, a diode 15 which is connected between the junction 9a between the above bidirectional switch 9 and the above capacitor 10 and the above smoothing capacitor 7, a zero cross detecting means 12, a bidirectional switch driving signal generating means 13, and a bidirectional switch driving means 14. Hereby, the residual charge in the capacitor 10 ceases to flow through the bidirectional switch 9, which enables the downsizing of the element of the bidirectional switch 9 and the mitigation of burden to a power system. COPYRIGHT: (C)2006,JPO&NCIPI
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