Triple-Mode Average Current Control with Valley Current Shaping for DCM/CRM/CCM Boost PFC Converter

Liangliang Lu, Gaoshuai Shen, Haoran Xu, Qiaoling Tong, Run Min, Qiao Zhang (), Jun Yuan and Ningyu Liu
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Liangliang Lu: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Gaoshuai Shen: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Haoran Xu: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Qiaoling Tong: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Run Min: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Qiao Zhang: School of Automation, Wuhan University of Technology, Wuhan 430070, China
Jun Yuan: Hubei Jiufengshan Laboratory, Wuhan 430070, China
Ningyu Liu: Hubei Jiufengshan Laboratory, Wuhan 430070, China

Energies, 2022, vol. 15, issue 19, 1-23

Abstract: This paper presents a triple-mode average current control (TACC) strategy to achieve unity power factor and reduce the current stress for a boost PFC converter. The controller switches among different modes in each half-line cycle, and smooth transition is ensured by mapping of the operation region. By adaptive mode shifting, it reduces the current stress and current distortion caused by non-linear effects. With valley current shaping and comparisons, the TACC controller accordingly incorporates three control laws to adapt different modes. In discontinuous conduction mode (DCM), a variable on-time is calculated while the modulation is equivalent to PWM. In critical conduction mode (CRM), a constant on-time is derived, while the switching cycle is modified to regulate the current average value. For both DCM and CRM, the switching cycle is slightly extended to realize valley switching. Furthermore, with valley current shaping, the proposed controller reuses the CRM calculation to form continuous conduction mode (CCM) control law. To make the control laws compatible, normalized mapping and design rules are provided with respect to mode boundaries. This allows the TACC controller to automatically switch among different modes. Finally, experimental results prove the effectiveness of the controller in reducing the current stress and enlarging the preferable power range.

Keywords: boost; CCM; CRM; current mode control; current stress; DCM; harmonic distortion; power factor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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