CLLLC谐振变换器变频移相混合控制方法  

PFM+PSM hybrid control of CLLLC resonant converter

作　　者：邓钦瑞 何英杰[1,2] 雷超 刘进军 DENG Qinrui;HE Yingjie;LEI Chao;LIU Jinjun(College of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710000,China;Electrical Engineering College,Aalborg University,Aalborg 9200,The Kingdom of Denmark)

机构地区：[1]西安交通大学电气工程学院,陕西西安710000 [2]奥尔堡大学能源系,丹麦奥尔堡9200

出　　处：《电力自动化设备》2022年第2期148-154,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51777158);陕西省自然科学基金资助项目(2018JM5008);台达科教发展基金资助项目(DREG2017011)。

摘　　要：针对CLLLC谐振变换器存在脉冲频率调制的电压增益范围不足、相移调制的效率较低的问题,提出了一种可同时调节开关管占空比与开关频率的变频移相混合控制方法。该方法可以根据输入电压范围与负载功率变化范围自由切换混合控制模态以实现宽范围软开关与高运行效率,具有极高的调节自由度,且通过移相控制降低了启动时的冲击电流从而实现了软启动。最后,基于时域分析建立了CLLLC谐振变换器的模型,并搭建了一台基于碳化硅(SiC)的1 kW级CLLLC谐振变换器实验平台,实验结果验证了所提混合控制方法的可行性和优越性,整机在宽范围内效率可达96%。Aiming at the problem of CLLLC resonant converter,such as insufficient voltage gain range with pulse-frequency modulation and low efficiency with phase-shift modulation,a PFM+PSM(Pulse-Frequency Modulation and Phase-Shift Modulation)hybrid control method is proposed,which can adjust the duty ratio of switch tube and the switching frequency at the same time.This method can freely switch the hybrid control mode according to the input voltage range and load power variation range to achieve wide-range soft switching and high operating efficiency,with very high freedom degree of regulation.The soft start is achieved by reducing the impulse current during start-up stage with phase-shift control.Finally,the model of CLLLC resonant converter is established based on time-domain analysis,and the experimental platform of 1 kW CLLLC resonant converter based on SiC(Silicon Carbide)is built.Experimental results verify the feasibility and superiority of the proposed hybrid control method,and the efficiency of the whole machine can reach 96%in a wide range.

关 键 词：CLLLC谐振变换器 宽范围软开关 时域分析法 变频移相混合控制 

分 类 号：TM46[电气工程—电器]