| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a three-phase rectification device that reduces high frequency switching noise superimposed on an input current while improving a power factor. <P>SOLUTION: An interconnection point of both diodes of each series circuit in a rectification circuit and a negative output end of the rectification circuit are intermittently short-circuited at a frequency N1 on a front edge side of a positive level phase of an input current from a three-phase AC power supply, and are intermittently short-circuited at a frequency N2 on a rear edge side of the same phase. The interconnection point of both diodes of each series circuit in the rectification circuit and a positive output end of the rectification circuit are intermittently short-circuited at the frequency N1 on a front edge side of a negative level phase of the input current from the three-phase AC power supply, and are intermittently short-circuited at the frequency N2 on a rear edge side of the same phase. A ratio N1/N2 of the frequencies N1, N2 is changed in accordance with input power. <P>COPYRIGHT: (C)2013,JPO&INPIT |
