Method and apparatus for providing an initial bias and...

Details Method and apparatus for providing an initial bias and... Method and apparatus for providing an initial bias and...

2008-03-27

2011-10-04

Behm, Harry (Department: 2838)

Electric power conversion systems

Current conversion

With starting arrangement

C363S021080, C323S901000

Reexamination Certificate

active

08031494

ABSTRACT:
The invention relates to a switch-mode power converter including a bias circuit. A power converter power transformer includes a magnetic core. The switch-mode power converter power transformer also includes an initial bias primary winding and an initial bias secondary winding, both wound on the magnetic core, wherein the initial bias secondary winding shares at least one magnetic path in common with the initial bias primary winding. A driver is configured to drive the initial bias primary winding with high frequency pulses when enabled by an enable signal. A rectifier and capacitor are configured to provide a voltage to power a control circuit during a power converter start-up. A method provides an initial bias power for a power converter output side referenced controller, powering the output side referenced controller from the initial bias windings.

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patent: 2002/0122320 (2002-09-01), Brkovic
patent: 2004/0037098 (2004-02-01), Konno

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