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| Multi-Phase Interleaved Bidirectional DC-DC Converter with Coupled Inductors and Current Sharing Control Strategy |
| Su Bing, Wang Yubin, Wang Fan, Guo Zheng, Dong Yuxiang |
| School of Electrical Engineering Shandong University Jinan 250061 China |
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Abstract With the increase of phase number, multi-phase interleaved and magnetically integrated bidirectional DC-DC converter with single-core coupled inductor has several problems, such as asymmetrical parameters, high manufacturing cost, difficult design of the multi-phase magnetic core, and so on. In this paper, a multi-phase interleaved bidirectional DC-DC converter with two-winding coupled inductors is proposed. Taking four-phase interleaved bidirectional DC-DC converter as an example, this paper uses four two-winding coupled inductors instead of single-core coupled inductors. The steady-state and transient performance is then studied in detail. Meanwhile, the difference in phase circuit parameters may cause uneven current among phases, which makes excessive thermal and device stress in heavy-load phase, thereby deteriorating the whole system reliability. Therefore, a phase-decoupled current sharing control strategy is proposed. Finally, simulation and the prototype experiment have verified the superiority, reliability and practicability of the proposed converter and current sharing control strategy.
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Received: 10 September 2019
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2020, Vol. 35 
