CRM Boost-PFC电路的改进COT控制  

Improved COT Control Strategy for CRM Boost-PFC Circuits

作　　者：肖健 林见文 张家恺 潘广彬 XIAO Jian;LIN Jianwen;ZHANG Jiakai;PAN Guangbin(Longyan Power Supply Company of State Grid Fujian Electric Power Co.,Ltd.,Longyan 364000,China;Aletai Power Supply Company of State Grid Xinjiang Electric Power Co.,Ltd.,Aletai 836300,China;Dazhou Power Supply Company,State Grid Sichuan Electric Power Company,Dazhou 635000,China)

机构地区：[1]国网福建省电力有限公司龙岩供电公司,福建龙岩364000 [2]国网新疆电力有限公司阿勒泰供电公司,新疆阿勒泰836300 [3]国网四川省电力公司达州供电公司,四川达州635000

出　　处：《电器与能效管理技术》2024年第5期10-19,共10页Electrical & Energy Management Technology

摘　　要：针对临界导通模式(CRM)Boost-PFC电路开关管开通电压大导致开通损耗高、开通时d u/d t大导致电磁干扰(EMI)的问题,提出一种改进的软开关恒定导通时间(COT)控制方法。电路的开关管自适应地在低输入电压瞬时值时实现零电压开通(ZVS),在高输入电压瞬时值时实现谷底导通,降低开关管的导通电压,减小了导通损耗;降低导通时开关管的d u/d t,改善了电路的EMI性能。分析CRM Boost-PFC电路及所提控制方法的原理和工作过程,并探讨所提控制方法对电路EMI特性的影响,开展关键参数设计。最后,通过仿真和实验给出了样机的输入输出特性曲线、效率曲线和EMI特性曲线,验证所提控制方法的有效性。An improved soft switching constant on-time(COT)control method is proposed to address the issues of high conduction loss caused by turn-on voltage of the Boost-PFC circuit in critical conduction mode(CRM)and poor EMI caused by high d u/d t during conduction.The circuit switching transistors adaptively realize ZVS at low input voltage instantaneous value and valley conduction at high input voltage instantaneous value.The switching voltage and switching loss of the switching transistor are reduced.The d u/d t of switching transistor is reduced and EMI performance of circuit is improved.The Boost-PFC circuit of CRM,the principle and working process of the proposed control method are analyzed.The influence of the proposed control method on EMI characteristics of the circuit is explored.The key parameters are designed.Finally,the simulation and experiment results show the input and output characteristics,efficiency curves and EMI curves of the prototype,which can verify the effectiveness of the proposed control method.

关 键 词：Boost-PFC电路 改进COT控制 开关损耗 EMI 自适应 

分 类 号：TM46[电气工程—电器]