| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric power conversion device capable of improving distortion of a current waveform by performing switching in proper timing according to the current. <P>SOLUTION: An electric power conversion device 10 includes a reactor 12 connected to respective phase lines of a three-phase AC power source; two smoothing capacitors 14a, 14b connected in series between DC terminals of a three-phase rectifier 13; switching elements SW1, SW2, and SW3 each corresponding to each phase and having one end connected to an output end of each reactor 12 and the other end connected to a middle point between the two smoothing capacitors 14a, 14b; and a switching control part 15. The switching control part 15 switches the switching elements SW1, SW2, and SW3 within a predetermined angle range within an angle range of -30° or more and +60° or less when a zero-cross point of a voltage waveform of each phase is 0°, and the predetermined angle range is varied according to a maximum amplitude of a last half-wave current waveform in each phase. <P>COPYRIGHT: (C)2012,JPO&INPIT |
