LLC谐振变换器PFM+PWM混合控制方法研究  

The Research on PFM+PWM Hybrid Control Method of LLC Resonant Converter

作　　者：包尔恒[1] 郑大成 何玲[1] BAO Erheng;ZHENG Dacheng;HE Ling(Department qf Automation Engineering Guangdong Technical College of Water Resources and Electric Engineering,Guangzhou Guangdong 510925,China;Shenzhen Huarui New Energy Technology Co.,Ltd.,Shenzhen Guangdong 518110,China)

机构地区：[1]广东水利电力职业技术学院自动化工程系,广东广州510925 [2]深圳市华瑞新能源技术有限公司,广东深圳518110

出　　处：《电子器件》2022年第1期102-105,共4页Chinese Journal of Electron Devices

基　　金：2020年度广东省普通高校特色创新项目(2020KTSCX261)。

摘　　要：LLC谐振变换器在特定的谐振腔参数设计及电路寄生参数的影响下,通常会出现高频段频率对增益的调节作用大大减弱甚至失去调节作用的现象,造成其在宽范围输出电压应用场合的设计困难,在数字化控制电源中,PFM结合移相控制或PWM控制是有效的解决途径。分析了特定条件下LLC谐振变换器采用单一的PFM或PWM控制时存在的问题,提出了有效的PFM+PWM混合控制设计方法,并以2 000 W宽范围输出电压LLC谐振变换器设计实践为例进行了实验验证。Under the influence of specific resonant tank parameter design and circuit parasitic parameters, the LLC resonant converter usually has such a problem that the frequency adjustment effect on the circuit gain is greatly weakened or even lost adjustment, this makes it difficult to design LLC resonant converter in a wide range of output voltage applications. In the digital control power supply, the PFM combined with phase shift control or PWM control is an effective solution. The problems existing when LLC resonant converter adopts single PFM or PWM control under certain conditions are analyzed, and effective hybrid control design methods are put forward. At last, the design practice of 2 000 W LLC resonant converter with a wide range of output voltage is used as an example for experimental verification.

关 键 词：LLC谐振变换器 脉冲宽度调制 脉冲频率调制 混合控制 

分 类 号：TM46[电气工程—电器]