Self-Driven Synchronous Rectifier By Retention Of Gate Charge
A Synchronous Rectifier Is Disclosed, Which Makes Use Of Gate Charge Retention Technique. In A Forward Converter After The Main Transformer Is Reset Its Secondary Voltage Diminishes To Zero. For Self-Driven Synchronous Rectifiers The Driving Voltage Is Lost And Current Is Forced To Go Through Body Diode With High Conduction Loss. Active Clamp Is A Method To Get Around The Problem But It Requires An Active Switch On The Primary Side. The Present Invention Introduces Gate Charge Retention Method By, Which No Additional Active Switch Is Required On The Primary Side. Synchronous Rectifiers Are Kept On Even After The Main Transformer Is Reset And Secondary Voltage Diminished To Zero. This Synchronous Rectifier Avoids Effect Of Leakage Inductance In Converter Transformer Windings And Operates At High Efficiency. This Synchronous Rectifier Can Operate In A Number Of Circuit Topologies.
Patent Number: US6377477B1
Application Number: US2001615382A
Inventor: Xie, Xue Fei | Poon, Ngai Kit | Liu, Pong | Pong, Hay
Priority Date: 16 Jul 1999
Priority Number: US6377477B1
Application Date: 21 Feb 2001
Publication Date: 23 Apr 2002
IPC Current: H02M0003335
US Class: 36302114 | 363020 | 36302106 | 36302112
Assignee Applicant: The University of Hong Kong
Title: Self-driven synchronous rectifier by retention of gate charge
Usefulness: Self-driven synchronous rectifier by retention of gate charge
Summary: For synchronous rectification of high efficiency converter.
Novelty: Synchronous rectifier system for power converter, allows synchronous switch to remain in conduction state at zero transformer secondary volts and switch to non-conductive state, when another switch is in conductive state
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香港
