隔离式双向全桥DC-DC变换器的功率控制特性比较与分析

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摘要针对非谐振和谐振式带隔离的双向全桥DC-DC变换器的不同特点, 推导了这两种DC-DC变换器功率传输的统一表达式, 该功率表达式可以统一描述这两种不同拓扑的功率传输特性。针对隔离式双向全桥DC-DC变换器的开关器件在高频工况下的强迫开通/关断方式, 带来较大的开关损耗, 造成变换器效率下降的问题, 本文以一种带隔离的LC谐振式DC-DC变换器为研究对象, 提出了一种移相控制的DC-DC变换器控制策略, 在该策略下, DC-DC变换器的功率器件能够实现零电压开通, 并且通过谐振减小了功率器件的关断损耗, 从而提高了系统的效率。仿真和实验结果验证了文中所提出控制策略的有效性。

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	武琳
	刘志刚
	洪祥

关键词 ：双向全桥DC-DC变换器, 串联谐振, 软开关, 基波分析法, 电压增益

Abstract：For the different characteristics of non-resonant and resonant isolated bidirectional full bridge DC-DC converter, a unified expression of power transmissions is derived from the two DC-DC converters. The power transfer characteristics could be unified described through the power expression. The problem of isolated bidirectional DC-DC converter is that the switching loss increases and the converter efficiency declines with the forced turn-on or turn-off of switch devices in high frequency situation. In this paper, to solve this problem, an isolated LC series resonant transformer full bridge DC-DC converter is taken as research object, a phase-shift control strategy which could realize zero voltage turn-on and decrease the turn-off current of the power devices to decrease switching loss and increase the efficiency is proposed. The validity of proposed control strategy is verified through simulation and experiment results.

Key words： Bidirectional full bridge DC-DC converter series resonant soft-switching technology first harmonic analysis voltage gain

收稿日期: 2013-01-08 出版日期: 2014-03-25

PACS:

TM464

基金资助:国家自然科学基金重点基金资助项目(U1134204)

作者简介: 武琳男, 1982年生, 博士研究生, 主要研究方向为大功率电力电子变换器和DC-DC电源。刘志刚男, 1961年生, 博士, 教授, 博士生导师, 主要研究方向为电力电子与机车传动, 牵引供电系统和机车网络控制。

引用本文:

武琳, 刘志刚, 洪祥. 隔离式双向全桥DC-DC变换器的功率控制特性比较与分析[J]. 电工技术学报, 2013, 28(10): 179-187. Wu Lin, Liu Zhigang, Hong Xiang. Comparison and Analysis of Power Control Characteristic for Isolated Bidirectional Full-Bridge DC-DC Converter. Transactions of China Electrotechnical Society, 2013, 28(10): 179-187.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I10/179

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