电子器件2018，Vol.41Issue(3)：621-624,4.DOI:10.3969/j.issn.1005-9490.2018.03.015
PWM控制LLC谐振变换器一种常见MOSFET失效分析及对策
A Common MOSFET Failure Analysis and Solution about LLC Resonant Converter in PWM State
摘要
Abstract
In wide output voltage and load range applications,since the non-monotonic phenomenon in high frequency region of the LLC resonant converter and considering of limiting the too high switching frequency,a simple frequency control is difficult to satisfy need and the usual approach is to introduce PWM control on the basis of PFM. The LLC resonant converter exists such a operating state under certain conditions of PWM control mode,that is,during body diode reverse recovery of the upper MOSFET of bridge circuit,the lower MOSFET is turned on simultaneously,the instantaneous pass-through phenomenon will cause excessive voltage and current stress and lead to MOSFET failure. The mechanism failure is analyzed,the solution is proposed and makes experimental tests are made and get real results.关键词
LLC谐振变换器/PWM/体二极管反向恢复/MOSFET失效Key words
LLC resonant converter/PWM/body diode reverse recovery/MOSFET failure分类
信息技术与安全科学引用本文复制引用
包尔恒,邓桂芳,何玲,周小义..PWM控制LLC谐振变换器一种常见MOSFET失效分析及对策[J].电子器件,2018,41(3):621-624,4.基金项目
广东水利电力职业技术学院"一流高职"科学研究和社会服务能力建设项目( cy06040301) （ cy06040301）
