基于半桥LLC谐振的AC-DC变换器研究与设计  

Research and design half-bridge LLC resonant for AC-DC converter

作　　者：吕清松 许宜申 倪兆麟 马仕哲 Lv Qingsong;Xu Yishen;Ni Zhaolin;Ma Shizhe(School of Optoelectronic Science and Engineering,Soochow University,Suzhou,Jiangsu 215006)

机构地区：[1]苏州大学光电科学与工程学院

出　　处：《电气技术》2019年第10期35-40,共6页Electrical Engineering

基　　金：苏州大学2017年高等教育教学改革研究资助项目(5731502218);苏州大学大学生创新创业训练计划项目(201810285085X)

摘　　要：随着电力电子技术的飞速发展,高效、高功率密度已成为功率变换器的主要发展方向,而传统脉冲宽度调制功率变换器采用硬开关技术,开关损耗大、效率较低。本文针对这一实际问题以及适应宽范围电压输入的应用需求,采用“APFC+LLC+SR”拓扑结构,设计了一款具备宽电压输入、高功率因数和高效率特点的AC-DC变换器,并完成了200W/24V系统样机设计。测试结果表明,当市电输入时,样机功率因数可达0.98,且系统在全负载范围内的平均效率达到92%以上,验证了设计方案的有效性,可满足一定范围内的实际应用需求。With the rapid development of power electronics technology,high efficiency and high power density have become the main development directions of power converters,while traditional PWM power converters use hard switching technology,which has large switching losses and low efficiency.In view of this practical problem and the application requirements for wide-range voltage input,an AC-DC converter with wide voltage input,high power factor and high efficiency is designed by using APFC+LLC+SR topology structure,and a prototype of 200W/24V system is built.The test results show that the prototype power factor can reach 0.98 at 220V/50Hz input,and the average efficiency of the system in the entire load range is over 92%,which verifies the effectiveness of the design scheme and can meet the practical application requirements within a certain range.

关 键 词：AC-DC变换器 软开关 半桥LLC谐振 同步整流 高效率 

分 类 号：TM4[电气工程—电器]