Switching electric source device

Details Switching electric source device Switching electric source device

2006-05-09

2006-05-09

Nguyen, Matthew V. (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021020

Reexamination Certificate

active

07042739

ABSTRACT:
A switching electric source device includes a first synchronous rectifier control circuit, which detects the resonance state developed based on the exciting energy of the primary winding after the main switching element switches off, and causes a first synchronous rectifier to switch on earlier during the time period from the completion of the resonance state to the switching on of the main switching element. Thus, the first synchronous rectifier switches on during the time period, and thus, current is prevented from flowing through a body diode, so that a voltage caused by the voltage drop in the body diode is prevented from being induced in the secondary winding and the third winding. As a result, variations in the output voltage, which is caused by the induced voltage of the third winding, can be prevented. The output voltage can be stabilized.

REFERENCES:
patent: 6061255 (2000-05-01), Chik et al.
patent: 6295214 (2001-09-01), Matsumoto et al.
patent: 6351396 (2002-02-01), Jacobs
patent: 2003/0048643 (2003-03-01), Lin et al.
patent: 2005/0243481 (2005-11-01), Williams et al.
patent: 2001-025245 (2001-01-01), None

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