Primary sampling current controlled synchronous rectifying...

Details Primary sampling current controlled synchronous rectifying... Primary sampling current controlled synchronous rectifying...

2009-02-17

2011-12-13

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021060, C363S021140, C363S089000

Reexamination Certificate

active

08077481

ABSTRACT:
A primary winding current controlled synchronous rectifying drive circuit including a current sampling circuit that detects a current signal in a primary winding of a transformer and forwards it to a signal shaping and reset circuit, and a current compensation signal circuit that compensates a magnetizing current in the primary winding of the transformer, wherein the signal shaping and reset circuit converts a sample of the current signal into a voltage signal and shapes it into a pulse signal, and then forwards the current signal to a logic control and power drive circuit that converts the pulse signal into one or more drive signal(s) through logic control, then the drive signal(s) are amplified to drive a corresponding synchronous rectifier.

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Datasheet for UCC3808. “Low Power Current Mode Push-Pull PWM”. Unitrode Products from Texas Instruments. Apr. 1999, Revised Aug. 2002.

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