摘要
为适应变流产品高频化、高功率密度化的发展趋势,重点介绍了LLC谐振软开关电路的工作原理,研究了LLC谐振网络主要数学关系,分析了软开关实现的理论条件。提出了LLC谐振软开关电路在工程上实现软开关的3个约束,结电容放电时间约束、一次侧电流过零约束和频率匹配约束。在此基础上搭建了1台60kW基于LLC谐振软开关的DC/DC变换器,并通过试验验证了设计的可行性。
In order to adapt to the development trend of high frequency and high power density of converter products,the working principle of LLC resonant soft-switching circuit was mainly introduced,the main mathematical relationship of LLC resonant network was studied,and the theoretical conditions of soft-switching realization were analyzed.Three constraints of LLC resonant softswitching circuit,including the time constraints of junction capacitance discharge,zero-crossing constraints of primary current and frequency matching constraints,were proposed.On this basis,a 60 kW DC/DC converter based on LLC resonant soft-switching was built,and the feasibility of the design was verified by experiments.
作者
张小勇
张庆
饶沛南
耿志东
罗盼
ZHANG Xiaoyong;ZHANG Qing;RAO Peinan;GENG Zhidong;LUO Pan(Zhuzhou CRRC Times Electric Co.,Ltd.,Zhuzhou,Hunan 412001,China)
出处
《机车电传动》
北大核心
2019年第3期95-98,119,共5页
Electric Drive for Locomotives
关键词
LLC谐振
软开关
DC/DC变换器
软开关工程约束
结电容放电时间
一次侧电流过零时间
频率匹配
LLC-resonant
soft switching
DC/DC converter
soft switch engineering constraints
junction capacitance discharge time
time for primary current to cross zero
frequency matching
