| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switching power supply apparatus with high noise immunity so that off-resonance may be surely prevented without malfunctions, thereby providing stable operations of transistors which constitute a switching element. <P>SOLUTION: A control circuit is configured to: detect whether a resonance current detected by a current detection unit is beyond (below) a first detection level over a predetermined time period; when beyond (below) the first detection level, further detect whether the resonance current is below (beyond) a second detection level; and, when below (beyond) the second detection level, invert levels of a drive control signal at which a first switching element and a second switching element are turned on or off. <P>COPYRIGHT: (C)2013,JPO&INPIT |
