正向拓扑中在死区驱动同步整流器的两种方法

APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058) Pub Date : 2000-02-06 DOI:10.1109/APEC.2000.822810

Xie Xuefei, J.C.P. Liu, F. Poon, B. Pong

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引用次数: 25

摘要

传统的自驱动同步整流正向拓扑结构在变压器磁复位过程结束，变压器绕组出现零电压时，不能为自由行同步整流器提供驱动电压。这会导致SR体二极管导通，影响同步整流的性能。本文提出了两种磁流变驱动机制:栅极电荷保留驱动和能量回收电流驱动。这两种机构都能解决该本体二极管的导通问题。该电流驱动方法还提供恒定的驱动电压并允许并联操作。采用这两种方法设计了两个250khz、48v输入、5v / 10a输出的DC-DC模块。两个模块在满载时的效率达到92%。

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Two methods to drive synchronous rectifiers during dead time in forward topologies

Conventional self-driven synchronous rectification forward topology cannot provide drive voltage for freewheeling synchronous rectifier (SR) when transformer magnetic reset process is over and zero voltage appears across the transformer windings. This causes SR body diode turn on and deteriorates the performance of synchronous rectification. In this paper, two SR drive mechanisms, gate charge retention drive and energy recovery current drive are presented. Both mechanisms can solve this body diode turn on problem. The current driven method also provides constant drive voltage and allows parallel operation. Two 250 kHz, 48 V input 5 V/10 A output DC-DC modules are designed using these two methods. 92% efficiency is achieved at full load for both modules.

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APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058)

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