Tri-state Modulation with Operating Losses Minimization for a Soft-switching Bidirectional DC-DC Converter  

作　　者：Jiaqi Yu Yong Li Jianghu Wan Feng Zhou Mingmin Zhang Lihua Cao 

机构地区：[1]the College of Electronic Information and Electrical Engineering,Changsha University,Changsha 410022,China [2]the College of Electrical and Information Engineering,Hunan University,Changsha 410082,China [3]the School of Automation,Central South University,Changsha 410083,China

出　　处：《Protection and Control of Modern Power Systems》2024年第6期58-70,共13页现代电力系统保护与控制(英文)

基　　金：supported by the National Natural Science Foundation of China(No.52207076);the Natural Science Foundation of Hunan Province(No.2023JJ50025).

摘　　要：This paper introduces a tri-state modulation technique for a soft-switching bidirectional DC-DC converter (BDC). This method maintains the soft-switching condition and introduces a freewheeling interval that reduces the rise and fall times of the inductor current, effectively suppressing inductor current ripples. Additionally,the tri-state modulation provides an extra degree of freedom, enabling optimization for reduced operating losses. The paper details the operation principles of tri-state modulation in both buck and boost modes and discusses optimization strategies for minimizing losses. An experimental setup is developed to validate the tri-state modulation approach, where switching waveforms and efficiency are measured. The experimental results confirm that the proposed method achieves soft-switching conditions, suppresses inductor current ripples, and provides higher efficiency compared to conventional hard-switching BDC and typical soft-switching BDC.

关 键 词：Terms—Bidirectional DC-DC converter SOFT-SWITCHING inductor current ripples tri-state control efficiency improvement. 

分 类 号：TM4[电气工程—电器]