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YAO Hongtao,SU Mei,DAN Hanbing,XIONG Wenjing,WU Sisheng,HU Ziheng.Input-parallel-output-parallel Wide-range Bidirectional Isolated DC/DC Converter[J].JOURNAL OF POWER SUPPLY,2020,18(3):13-21
Input-parallel-output-parallel Wide-range Bidirectional Isolated DC/DC Converter
Received:December 31, 2019  Revised:March 22, 2020
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DOI:10.13234/j.issn.2095-2805.2020.3.13
Keywords:DC/DC converter  electrical isolation  bidirectional power transmission
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AuthorInstitutionEmail
YAO Hongtao Hunan SANY Intelligent Control Equipment Corporation, Changsha , China
SU Mei School of Automation, Central South University, Changsha , China
DAN Hanbing School of Automation, Central South University, Changsha , China
XIONG Wenjing School of Automation, Central South University, Changsha , China
WU Sisheng School of Automation, Central South University, Changsha , China
HU Ziheng School of Automation, Central South University, Changsha , China
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Abstract:
      At present, DC/DC converters are widely used in the fields of new energy power generation, electric vehicles, as well as lithium batteries. A bidirectional isolated input-parallel-output-parallel DC/DC converter is proposed for the bidirectional power transmission application scenario with low output voltage and high output current, which is composed of two identical two-stage DC/DC converters. A high-efficiency LLC resonant converter is used as a DC transformer at the front stage to achieve electrical isolation while an interleaved Buck/Boost converter is used at the rear stage, thus guaranteeing a wide-range of output voltage and high dynamic performance. The proposed converter can realize bidirectional power transmission. In addition, a modulation strategy is adopted, which does not require the judgment of power flow direction or the changing switch logic when the power flow direction changes. As a result, the control strategy is simplified, and the reliability of the DC/DC converter is improved. A 3 kW experimental device was designed, and experimental results verified the feasibility and effectiveness of the proposed converter and its control method.
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