摘要
针对LLC谐振槽双向DC/DC变换器反向运行归一化电压增益小于1,致使正向运行输入电压范围受限的问题,提出了一种新型反向运行升压驱动方式。该升压驱动方式通过在恰当时间开通整流开关管构造出谐振元件储能回路,实现最大归一化增益为2的升压。介绍了该双向LLC谐振变换器的工作原理,细致分析了反向工作过程,并在Matlab中进行建模仿真和验证。样机测试结果表明,该双向LLC谐振变换器正向运行效率高,反向运行时多数开关管保持了软开关、实现了高效率。
A novel step-up driving method is proposed to solve the problem of the normalized voltage gain less than 1 when the bi-directional LLC resonant converter works in backward mode.This step-up control method turns on rectifier switches to help resonant components recover their energy and improves the normalized voltage gain to 2.Working principle of the bi-directional LLC resonant converter is introduced firstly.The working procedures under continuous and discontinuous mode are analyzed and deduced.The Matlab simulation and experiment results show that this novel bi-directional LLC resonant circuit works with a high efficiency and most of the switching devices can still achieve soft switching at the same time in the backward operation.
出处
《电力电子技术》
CSCD
北大核心
2017年第10期1-5,共5页
Power Electronics
基金
深圳市科技计划项目(JCYJ20140417172417103)~~
关键词
变换器
电压增益
升压驱动
converter
voltage gain
step-up driving
