Switching power supply device

Details Switching power supply device Switching power supply device

2011-06-21

2011-06-21

Sterrett, Jeffrey L (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S016000, C363S019000, C363S021160

Reexamination Certificate

active

07965523

ABSTRACT:
In a switching power supply device, a first switch element, which defines a main switch element of a DC-DC converter, and a third switch element, which defines a switch element of a power-factor correcting circuit, are controlled such that turn-on timings are synchronized while on-period control is independently performed to thereby prevent an increase in switching frequency and prevent noise by eliminating intermittent oscillation. Thus, it is possible to prevent intermittent oscillation control due to an increase in switching frequency of the first switch element under a light load state or a no load state. This eliminates problems of the frequency of intermittent oscillation that falls within an audible frequency range causing noise and increasing ripple voltage.

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Official Communication issued in International Patent Application No. PCT/JP2008/063728, mailed on Oct. 28, 2008.

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