半桥LLC变换器谐振参数及ZVS失效分析  

LLC Resonant Parameters of Half-bridge Converter and Analysis of ZVS Failure

作　　者：郑雪钦[1,3] 万志群[1] 张凌涛 王春阳[1] 

机构地区：[1]厦门理工学院,电气工程与自动化学院,福建厦门361024 [2]厦门拓宝科技有限公司,福建厦门361009 [3]厦门理工学院,福建省高电压技术重点实验室,福建厦门361024

出　　处：《电力电子技术》2016年第5期86-88,101,共4页Power Electronics

基　　金：福建省自然科学基金计划项目(2015J01650);厦门理工学院国家基金预研项目(XYK201403)~~

摘　　要：采用基波近似原理推导出LLC谐振变换器等效模型,深入分析半桥LLC工作状态。根据等效模型,重点研究了主要谐振参数对变换器直流增益的影响。通过仿真分析变换器零电压开通(ZVS)失效与负载和频率的关系,并对变换器各参数进行优化和限定最大输出功率,避免了ZVS失效。最后设计出150 W/48 V的变换器,仿真及实验均达到预期效果,进一步验证了该方法的正确性和可行性。The equivalent model of half-bridge LLC resonant converter is developed based on fundamental approxim- tion principles.The working conditions of half-bridge LLC are deeply analyzed.The influence of resonant parameters on DC gain is studied.The relationship between zero voltage switching turning-on（ZVS） failure and load and frequency is analyzed based on simulation by which the parameters of the converter is optimized and the maximum output power is limited,which can avoid ZVS failure.Finally,the converter of 150 W/48 V is designed.The simulation and experimental results are up to expectations.

关 键 词：变换器 直流增益 零电压开通 

分 类 号：TM46[电气工程—电器]