电器与能效管理技术 ›› 2024, Vol. 0 ›› Issue (5): 10-19.doi: 10.16628/j.cnki.2095-8188.2024.05.002

• 研究与分析 • 上一篇    下一篇

CRM Boost-PFC电路的改进COT控制

肖健1, 林见文1, 张家恺2, 潘广彬3   

  1. 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
  • 收稿日期:2024-01-31 出版日期:2024-05-30 发布日期:2024-06-25
  • 作者简介:肖 健(1995—),男,工程师,主要从事电力电子变流技术和电气工程设计工作。|林见文(1996—),男,工程师,主要从事电力电子变流技术和电气工程设计工作。|张家恺(1995—),男,工程师,主要从事电气工程设计工作。

Improved COT Control Strategy for CRM Boost-PFC Circuits

XIAO Jian1, LIN Jianwen1, ZHANG Jiakai2, PAN Guangbin3   

  1. 1. Longyan Power Supply Company of State Grid Fujian Electric Power Co.,Ltd., Longyan 364000, China
    2. Aletai Power Supply Company of State Grid Xinjiang Electric Power Co.,Ltd., Aletai 836300, China
    3. Dazhou Power Supply Company,State Grid Sichuan Electric Power Company, Dazhou 635000, China
  • Received:2024-01-31 Online:2024-05-30 Published:2024-06-25

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du/dt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du/dt,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。

关键词: Boost-PFC电路, 改进COT控制, 开关损耗, EMI, 自适应

Abstract:

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 du/dt 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 du/dt 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.

Key words: Boost-PFC circuit, improved COT control, switching loss, EMI, adaptively

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