反激变换器有源钳位技术  

Research on Active Clamping Technique for Flyback Converter

作　　者：孙馗苡 王京梅[1] SUN Kuiyi;WANG Jingmei(School of Integrated Circuit Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学集成电路科学与工程学院,四川成都611731

出　　处：《电子科技》2025年第5期76-82,共7页Electronic Science and Technology

基　　金：四川省科技计划重点研发项目(2022YFG0319)。

摘　　要：针对在反激式变换器中,变压器漏感导致开关管需要承受较大应力、能量损耗大、漏感能量无法回收以及电源工作效率偏低等问题,文中研究了反激式变换器的有源钳位技术,分析了反激式变换器中有源钳位电路的工作原理和各阶段工作过程,阐述了在反激变换器中引入有源钳位技术的优势。以反激式变换器设计方法为基础,梳理有源钳位反激变换器(Active Clamp Flyback,ACF)的设计过程,给出有源钳位反激变换器的设计案例,并制作样机进行测试。测试结果表明,样机的原边开关管在工作过程中实现了零电压开通(Zero Voltage Switching,ZVS),对比无源钳位反激电路效率提升了约3%。研究结果表明,在反激变换器中引入有源钳位技术能有效改善由于变压器漏感造成的电压尖峰、能量损耗问题,降低了开关管电压应力,实现了ZVS,有效提高了电源系统的效率和稳定性。In view of the problems in flyback converter,transformer leakage leads to the switch tube need to bear greater stress,large energy loss,failure to recover leakage energy and low efficiency of power supply,this study investigates the active clamping technology of flyback converter,analyzes the working principle and working process of active clamping circuit in flyback converter.The advantages of introducing active clamping technology in flyback converter are described.Based on flyback converter design method,the design process of ACF(Active Clamp Flyback)is reviewed,a design case of ACF is given,and a prototype is made for testing.The test results show that the prototype realizes ZVS(Zero Voltage Switching)in the working process,and the efficiency is increased by about 3%when compared with the passive clamp flyback circuit.The research results show that the introduction of active clamping technology in flyback converter can effectively improve the voltage spike and energy loss caused by transformer leakage,reduce the voltage stress of switching tube,realize ZVS,and effectively improve the efficiency and stability of power supply system.

关 键 词：反激变换器 高频变压器 有源钳位 ACF 软开关 ZVS 无源钳位 漏感 

分 类 号：TN86[电子电信—信息与通信工程]