High-Efficiency Self-Driven Technique for Non-Isolated 12V VRs

Description:
The concept of self-driven for synchronous rectifier devices was widely used in isolated topologies, where the voltage across the secondary winding can be used, or partially used as the gate driving source for the rectifiers. The main benefit of self-driven is that the driving circuit is simplified, which results in a low cost solution. However, in conventional buck converter, which is the dominant member in 12V VRM family, it is very difficult to adopt selfdriven scheme. The proposed self-driven topologies are basically buck-derived multi-phase interleaving soft switching topologies, which can use self-driven easily, save driving loss and achieve ZVS. A prototype of 4-phase 12V VRM delivering 1.3V/70A output power is implemented to show its advantages (Cost, Size and Efficiency) over the conventional multi-phase buck converter.This invented circuit is really simple and high efficient. It can be a very good candidate to be used in the field of low voltage high current application such as 12V voltage regulator for microprocessors.

  
Patent Information:
Title App Type Country Serial No. Patent No. File Date Issued Date Expire Date
Bridge-Buck Converter with Self-Driven Synchronous Rectifiers US Utility *United States 10/454,779 6,859,372 6/5/2003 2/22/2005 8/20/2023
Category(s):
Electrical
For Information, Contact:
Li Chen
Licensing Associate
Virginia Tech Intellectual Properties, Inc.
(540) 443-9217
lchen@vtip.org
Inventors:
Jinghai Zhou
Ming Xu
Fred Lee
Keywords:
Power Conversion/Control
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