Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 1, Pages 81-88Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2397455
Keywords
Bidirectional dc/dc converter (BDC); high voltage conversion ratio (HVCR); interleaved; three-phase dc/dc converter (TPDC); Y-Delta connected transformer
Categories
Funding
- National Natural Science Foundation of China [51377080]
- Fok Ying Tong Education Foundation [131056]
- Natural Science Foundation for Distinguished Young Scholars of Jiangsu Province [BK20130036]
- Research Fund for the Doctoral Program of Higher Education of China [133218110015]
- Aeronautical Science Foundation of China [2013ZC52035]
- Lite-On Power Electronics Technology Research Fund
- Jiangsu Key Laboratory of New Energy Generation and Power Conversion Open Research Fund
- Nanjing University of Aeronautics and Astronautics Fundamental Research Funds [NE2013102]
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In order to solve the problem of high voltage conversion ratio between dc bus and energy storage unit, a novel bidirectional three-phase dc/dc converter applicable to high-power condition is proposed in this paper. With the new PWM strategy and inherent ability of increasing voltage conversion ratio of Y-Delta connected transformer, the voltage conversion ratio is doubled. With the new PWM strategy, the effective duty cycle range of three-phase dc/dc converter is expanded, which results in halved filter inductance. Three-phase full-bridge structure is connected to the dc bus, while current-tripler unit is connected to the battery. As three-phase interleaved structure is adopted, not only current stress of switches decreases but also the frequency of input and output current ripple increases to three times of switching frequency, which leads to smaller filters and extended lives cycle of batteries. The operating principle and characteristics of the converter are analyzed in detail. A prototype with the 360-V dc bus converted to 48 V/42 A batteries was built and the results are given based on the experiments.
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