| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power factor improvement circuit capable of suppressing reduction in efficiency by reducing a loss at the time of voltage conversion. <P>SOLUTION: A power factor improvement circuit includes control means Cont in which, when a DC rectification voltage Vpfc rectified by rectification means Rc and a given target voltage Vo are compared with each other, and the rectification voltage Vpfc is lower than the target voltage Vo, a second switching element is turned off and a control signal for switching a first switching element Trl is outputted, and, when the rectification voltage Vpfc is higher than the target voltage Vo, the first switching element Tr1 is turned on and a control signal for switching the second switching element Tr2 is outputted. <P>COPYRIGHT: (C)2013,JPO&INPIT |
