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Open AccessArticle

A Four-Phase High Voltage Conversion Ratio Bidirectional DC-DC Converter for Battery Applications

School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
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Academic Editor: Joeri Van Mierlo
Energies 2015, 8(7), 6399-6426; https://doi.org/10.3390/en8076399
Received: 30 April 2015 / Revised: 17 June 2015 / Accepted: 18 June 2015 / Published: 25 June 2015
(This article belongs to the Special Issue Advances in Plug-in Hybrid Vehicles and Hybrid Vehicles)
This study presents a four-phase interleaved high voltage conversion ratio bidirectional DC-DC converter circuit based on coupled inductors and switched capacitors, which can eliminate the defects of conventional high voltage conversion ratio bidirectional DC-DC converters in terms of high-voltage/current stress, less efficiency and low-power limitation. Parallel channels are used to reduce current stress at the low-voltage side and series connected switched capacitors are used to enlarge voltage conversion ratio, reduce voltage stress and achieve auto current sharing. This paper proposes the operation principle, feature analysis and optimization design considerations. On this basis the objectives of high voltage conversion ratio, low voltage/current stress, high power density, high efficiency and high-power applications can be achieved. Some experimental results based on a 500 W prototype converter (24 V to 48 V at low-voltage side, 400 V at high-voltage side) are given to verify the theoretical analysis and the effectiveness of the proposed converter. View Full-Text
Keywords: battery; bidirectional DC-DC converter; high conversion ratio; interleaved; switched capacitor; coupled inductor battery; bidirectional DC-DC converter; high conversion ratio; interleaved; switched capacitor; coupled inductor
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Xue, L.-K.; Wang, P.; Wang, Y.-F.; Bei, T.-Z.; Yan, H.-Y. A Four-Phase High Voltage Conversion Ratio Bidirectional DC-DC Converter for Battery Applications. Energies 2015, 8, 6399-6426.

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