Valley detecting circuit and method for a voltage across a...

Details Valley detecting circuit and method for a voltage across a... Valley detecting circuit and method for a voltage across a...

2007-11-02

2011-10-18

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S284000, C323S285000, C363S021070

Reexamination Certificate

active

08040119

ABSTRACT:
A valley detecting circuit and method are provided for a voltage across a switching device, which detect a voltage across the switching device to produce a first voltage proportional to the voltage across the switching device, clamp the first voltage to produce a second voltage, level shift the second voltage to produce a third voltage, and compare the second voltage with the third voltage to determine a valley for the first voltage.

REFERENCES:
patent: 2005/0213355 (2005-09-01), Koike

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