| 摘要 |
PROBLEM TO BE SOLVED: To provide a power converter which can bring about an operation state that the optimum reduction of a harmonic always becomes possible irrespective of the number of power converters connected to a commercial power supply. SOLUTION: The power converter includes a short-circuit switch 16 which inputs an AC voltage input from the commercial power supply 11 via reactor 12 and rectifies it by a rectification circuit 13, converts a DC voltage smoothed by a smoothing capacitor 14 to an AC voltage by using an inverter 15 and feeds it to a load, and short-circuits the commercial power supply 11 via the reactor 12 by bypassing the rectification circuit 13. A voltage zero-cross point of the AC voltage input from the commercial power supply 11 is detected by a voltage zero-cross point detection part 18, a current warpage rate of an alternate current is detected by a current warpage-rate detection part 19, and a short-circuit switching control part 20 controls a switching time of the short-circuit switch 16 so that the current distortion rate becomes smallest in a range from a voltage zero-cross point to a zero-cross point at the next timing. COPYRIGHT: (C)2011,JPO&INPIT
|
