一种加辅助网络的移相全桥ZVS PWM变换器  

A Novel Phase-shifted Full-bridge ZVS PWM Converter Employing an Auxiliary Net

作　　者：张沛然[1] 李敏远[1] 

机构地区：[1]西安理工大学,自动化与信息工程学院,陕西西安710048

出　　处：《电力电子技术》2013年第2期67-69,100,共4页Power Electronics

摘　　要：通过对移相全桥零电压开关(ZVS)PWM变换器引入一个辅助网络,使滞后桥臂在一个较宽的负载范围内实现了软开关。由辅助网络替代了传统的谐振电感后,通过全桥电路斜对角两只开关管的导通箝位作用,消除了整流二极管上的电压尖峰,同时也减少了变压器次级占空比的丢失。分析了电路工作原理,并讨论了对传统全桥变换器缺陷的改善,给出了辅助网络的设计方法,并通过一台2.7 kW/270 V样机进行了实验验证。This paper introduces an auxiliary net to help the phase-shifted full-bridge zero voltage switching（ZVS） PWM converter＇s lagging leg to achieve soft switching in a wide load range.Mter the resonator inductance is replaced by the auxiliary net, the voltage overshoot on the rectifier diodes is eliminated, meanwhile the duty loss of the transformer second side is reduced.The principle of the operation is analyzed, how the disadvantages are ameliorated is discussed and the design procedure of the auxiliary net is provided.Finally ,the theoretical analysis is verified by experiments on a 2.7 kW/270 V prototype.

关 键 词：变换器 全桥 辅助网络 零电压开关 

分 类 号：TM46[电气工程—电器]