Circuit and method for predicting a valley timing for a...

Details Circuit and method for predicting a valley timing for a... Circuit and method for predicting a valley timing for a...

2011-03-15

2011-03-15

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021130, C323S283000, C323S284000

Reexamination Certificate

active

07907425

ABSTRACT:
Disclosed are circuits and methods for use in a control circuit of a switching mode power supply for turning on a switching device in the switching mode power supply when the voltage across the switching device is at a minimum. A voltage detector is provided for detecting the voltage across the switching device to produce a detection voltage which is a function of the voltage across the switching device, and circuit arrangement is used to predict a valley timing for the voltage across the switching device by evaluating the time period that the detection voltage falls down from a first threshold to a second threshold.

REFERENCES:
patent: 6445598 (2002-09-01), Yamada
patent: 6958920 (2005-10-01), Mednik et al.
patent: 2006/0250823 (2006-11-01), Murata et al.

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