宽电压输入半桥型LLC谐振变换器设计与实验  

Design and Experimental Study for LLC Half-bridge Resonant Converter of Wide Range Input Voltage

作　　者：朱姝姝[1] 刘闯[1] 胡耀华[1] 宁银行[1] 

机构地区：[1]南京航空航天大学,江苏南京210016

出　　处：《电力电子技术》2012年第3期65-67,共3页Power Electronics

基　　金：国家自然科学基金(50977044)~~

摘　　要：半桥型LLC谐振变换器由于拓扑简单、工作效率高而得到广泛研究。此处针对宽电压输入的工作情况,采用脉冲频率调制(PFM),避免了传统PWM控制占空比变化范围大的问题。为了提升变换器效率,对各关键谐振参数进行设计,分析了其对电源输出特性的影响,使得初级开关管实现零电压开通(ZVS),次级二极管实现零电流关断(ZCS)。结合理论数学推导和增益曲线分析,设计了一台100 W的变频半桥型LLC谐振变换器样机,并完成了相关实验,验证了参数设计的正确性,样机的最大效率达到93.95%。同时对变换器进行了损耗分析,以便进一步优化设计。Due to advantages of simple structure and high efficiency,half-bridge LLC resonant converter is widely studied.For wide input voltage application,pulse frequency modulation（PFM） is chosen to avoid pulse width varying in a wide range of pulse width modulation（PWM）.In order to improve the efficiency,the parameters of resonant circuit are designed.The influence of main parameters is analyzed.The converter achieves zero-voltage switching（ZVS） for pri-mary-side switches and zero-current switching（ZCS） for secondary-side diodes.100 W prototype is designed by mathe-matical deduction and gain curve analyses on the condition of wide range input voltage.The experiment is done to verify the design of parameters.The maximum efficiency of prototype reaches 93.95%.Meanwhile,the loss of power is analyzed for optimal design.

关 键 词：变换器 宽电压输入 脉冲频率调制 

分 类 号：TM46[电气工程—电器]