Switching power supply apparatus

Details Switching power supply apparatus Switching power supply apparatus

2006-04-25

2006-04-25

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021080

Reexamination Certificate

active

07035121

ABSTRACT:
An AC power supply supplied from an outlet11is rectified by a rectifying circuit13through an input filter12.The rectified power is supplied to a primary winding N1of a transformer14.A controlling circuit19has a switching device Q1that controls on/off at predetermined timing. An FB signal that represents a power state of a load circuit15is supplied to the controlling circuit19through a transistor Q2.A comparator20compares a rectified voltage V3of a tertiary winding of the transformer with a reference voltage REF3and outputs an error signal. With the error signal, the transistor Q2is controlled. Thus, the voltage for the controlling circuit supplied from the tertiary winding can be prevented from lowering against abrupt load variation. In addition, the output voltage Vo can be prevented from largely varying.

REFERENCES:
patent: 4754386 (1988-06-01), De Weerd
patent: 6456510 (2002-09-01), Patel et al.
patent: 0 749 199 (1996-12-01), None
patent: 11-224132 (1999-08-01), None
patent: 2001-224166 (2001-08-01), None
patent: 2004-112992 (2004-04-01), None
International Search Report Jun. 8, 2004.

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