Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2006-01-18
2008-03-04
Sterrett, Jeffrey (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S097000
Reexamination Certificate
active
07339800
ABSTRACT:
A switching power source device of resonance type is provided which comprises an output voltage detector18for detecting output voltage on a load13to produce a detection signal; and a control circuit2for applying on-off signals Vg1, Vg2to each control terminal of first and second MOS-FETs3, 4in response to the detection signal from the output voltage detector18.Control circuit2comprises a frequency control circuit23for controlling the on-off operation of first and second MOS-FETs3, 4in response to the level of detection signal from output voltage detector18to decide the switching frequency of first and second MOS-FETs3, 4.Frequency control circuit23is provided with an on-time control circuit21which more reduces the on-span of one of first and second MOS-FETs3, 4during the light load period in response to the level of detection signal from output voltage detector18than during the non-light load period to control power consumption, reduce switching loss and noise, and improve switching efficiency in electronics.
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Bachman & LaPointe P.C.
Sanken Electric Co. Ltd.
Sterrett Jeffrey
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