Synchronized rectification circuit and switching power...

Details Synchronized rectification circuit and switching power... Synchronized rectification circuit and switching power...

2007-09-18

2007-09-18

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021160, C363S089000

Reexamination Certificate

active

11448662

ABSTRACT:
A synchronized rectification circuit and a switching power supply device having little power loss with respect to a wide range of input voltages and having a high efficiency, comprising first and second switch elements, first and second capacitors connected with each other capable to equalize held voltages thereof in response to sift of an input AC voltage to intermediate voltage (for example 0V), a first driving circuit for turning on a switch element according to the held voltage changed in response to shift the input AC voltage to 0V from a negative polarity voltage and turning off the switch element earlier than a time where the input voltage shifts to the negative polarity voltage from 0V, and a second driving circuit to drive a switch element in the same way but in reverse phase.

REFERENCES:
patent: 5708571 (1998-01-01), Shinada
patent: 6130828 (2000-10-01), Rozman
patent: 6188592 (2001-02-01), Farrington et al.
patent: 6594159 (2003-07-01), Schlecht
patent: 6731520 (2004-05-01), Schlecht
patent: 6894468 (2005-05-01), Bretz et al.
patent: 6995991 (2006-02-01), Yang et al.
patent: 7035120 (2006-04-01), Tobita
patent: 7119524 (2006-10-01), Bretz et al.

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