Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2005-07-26
2005-07-26
Riley, Shawn (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021150, C363S021180
Reexamination Certificate
active
06922345
ABSTRACT:
A switching power supply includes a control circuit disposed between a feedback winding and a switching device. The control circuit includes an on-period control circuit that, in an operation under a non-low load condition, controls an on-period of the switching device such that the on-period decreases with decreasing load, a minimum on-period setting circuit that disables the on-period control circuit in an operation under a low load condition so that the on-period of the switching device does not become shorter than a predetermined minimum on-period, and an off-period control circuit that controls an off-period of the switching device in the operation under the low load condition such that the off-period increases with decreasing load. As a result, the output voltage is maintained at a constant value in accordance with a feedback signal.
REFERENCES:
patent: 4849869 (1989-07-01), Tanuma et al.
patent: 6529391 (2003-03-01), Yoshinaga et al.
patent: 7-015958 (1995-01-01), None
patent: 2000-278945 (2000-10-01), None
patent: 2001-16849 (2001-01-01), None
Nishida Akio
Takemura Hiroshi
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Riley Shawn
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