Synchronous rectification circuit

Details Synchronous rectification circuit Synchronous rectification circuit

2007-07-17

2007-07-17

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C363S053000

Reexamination Certificate

active

11475969

ABSTRACT:
A synchronous rectification circuit of a switching power supply device where circuit elements such as rectification switch elements are protected when an abnormality occurs in an output of a transformer, wherein a (fault) detecting circuit detects an abnormality of a trigger signal transmitted from a transformer, a shutoff circuit quickly cuts off a discharge route of an inductor (coil) forming a gate drive signal source of a first transistor (NMOS transistor) when the (fault) detecting circuit detects an abnormality, and a (linear) driver holds (clamps) a drain-source voltage of the NMOS transistor at a constant voltage and turns on the NMOS transistor by that constant voltage so as to prevent it from turning off immediately when the detecting circuit detects an abnormality.

REFERENCES:
patent: 6169683 (2001-01-01), Farrington
patent: 6445597 (2002-09-01), Boylan et al.
patent: 6785151 (2004-08-01), Ingman et al.
patent: 6980441 (2005-12-01), Man-ho
patent: 2003-189608 (2003-07-01), None

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