期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 30, 期 2, 页码 757-770出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2014.2307329
关键词
Bidirectional; energy storage system (ESS); high efficiency; LLC; resonant converter
资金
- National Nature Science Foundation of China [51277161, 51007081]
- National High Technology Research and Development Program of China 863 Program [2011AA050402]
This paper proposes an improved bidirectional LLC resonant topology with a new control scheme. All the switches in the proposed topology can achieve soft switching. Compared with traditional isolated bidirectional dc-dc converters such as dual active bridge converter, the reverse energy and turn-off loss are reduced dramatically, and the conversion efficiency can be much improved. With the proposed new control scheme, the power flow direction and output power of the proposed converter can be changed automatically and continuously, which is attractive for energy storage systems to balance the energy and to keep the dc-bus voltage constant. Performance of the proposed circuit is validated by the experimental results from a 1-kW prototype. Over 97% efficiency is achieved at full load condition based on the prototype.
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