Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2007-11-27
2007-11-27
Sterrett, Jeffrey (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021160, C363S056100
Reexamination Certificate
active
11372768
ABSTRACT:
A quasi resonant type switching power supplying unit includes an overcurrent limiting circuit and an oscillation level comparison circuit. The overcurrent limiting circuit (i.e., a level determining circuit and a reference voltage generating circuit) receives a reverse electromotive voltage generated from an auxiliary winding which is electromagnetically connected with a primary winding when a MOSFET is in an OFF state, and produces a reference voltage stepwise based on the reverse electromotive voltage. The oscillation level comparison circuit receives a feedback voltage corresponding to electric power supplied to a load, and produces a control signal that switches the MOSFET into an OFF state when the feedback voltage exceeds the reference voltage.
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Fujimura Yoshio
Noguchi Yasunari
Osha & Liang LLP
Sanyo Electric Co,. Ltd.
Sterrett Jeffrey
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