Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2006-08-15
2006-08-15
Riley, Shawn (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021170
Reexamination Certificate
active
07092261
ABSTRACT:
A switching power supply including an oscillator frequency tuner to enhance its load driving capability is presented. The oscillator frequency tuner includes a plurality of capacitors connected between a reference voltage output of the switching control circuit and a ground terminal, at least one bypass switch coupled across at least one of the capacitors for controlling the charging and discharging operation of the capacitor coupled therewith, and a bypass switch controller for controlling a switching state of the bypass switch. When the switching power supply is operating under a peak load condition, the bypass switch controller receives a feedback control signal and instructs the bypass switch to bypass current, and thus reducing the equivalent timing capacitance of the switching control circuit for increasing the maximum duty cycle of the switching control circuit.
REFERENCES:
patent: 4975823 (1990-12-01), Rilly et al.
patent: 6850422 (2005-02-01), Strijker
Allwyn Jacob D'Cunha
Rupesh Kumar Tandon
Supaporn Ittasakul
Tasi Kuei Hsiang
Delta Electronics (Thailand) Public Company Limited
Delta Electronics , Inc.
Madson & Austin
Riley Shawn
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