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| Tri-State Modulation with Operating Losses Minimization for a Soft-Switching Bidirectional DC-DC Converter |
| Jiaqi Yu,Yong Li, Senior Member, IEEE,Jianghu Wan,Feng Zhou,Mingmin Zhang,Lihua Cao |
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| Abstract: |
| This paper introduces a tri-state modulation technique for a soft-switching bidirectional DC-DC con-verter (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 con-firm 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. |
| Key words: Bidirectional DC-DC converter, soft-switching, inductor current ripples, tri-state control, efficiency improvement |
| DOI：10.23919/PCMP.2023.000248 |
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| Fund:This work is supported by the National Natural Sci
ence Foundation of China (No. 52207076) and the
Natural Science Foundation of Hunan Province (No.
2023JJ50025). |
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