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YAN Zhixing,ZENG Jun,LAI Zhen,LIU Junfeng.High Voltage-gain Bidirectional DC-DC Converter Based on Built-in Transformer[J].JOURNAL OF POWER SUPPLY,2020,18(3):4-12
High Voltage-gain Bidirectional DC-DC Converter Based on Built-in Transformer
Received:December 27, 2019  Revised:March 02, 2020
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DOI:10.13234/j.issn.2095-2805.2020.3.4
Keywords:bidirectional DC-DC converter  built-in transformer  interleaved technique  high voltage-gain  soft-switching
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
           
AuthorInstitutionEmail
YAN Zhixing School of Electric Power Engineering, South China University of Technology, Guangzhou , China
ZENG Jun School of Electric Power Engineering, South China University of Technology, Guangzhou , China
LAI Zhen School of Electric Power Engineering, South China University of Technology, Guangzhou , China
LIU Junfeng School of Automation Science and Engineering, South China University of Technology, Guangzhou , China
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Abstract:
      In this paper, a bidirectional DC-DC converter(BDC) with high voltage-gain, low voltage stress, and wide soft-switching range is proposed for energy storage systems. By integrating a built-in transformer into a flying-clamped structure and two interleaved buck/boost structures, the high voltage-gain and reduced voltage stress can be realized simultaneously. The feature of the built-in transformer is that a balanced magnetic flux exists in the magnetic core to avoid magnetic saturation, which allows for a smaller size of magnetic core. The current ripple on the low-voltage side is significantly reduced by adopting an interleaved structure. Moreover, the voltage-matching on both sides of the built-in transformer is realized by adjusting the duty cycle, thus reducing the current loop. Meanwhile, by employing phase-shift control, the power transmission can be regulated monotonously. The soft-switching of all MOSFETs within a wide range of battery voltage is realized by reasonably configuring parameters. The operational principle and steady-state analysis were given in detail, and a prototype of 1 kW rated power was designed to verify the effectiveness of the proposed converter. It is found that the efficiencies of the prototype in boost and buck modes are similar, indicating that the conversion efficiency is not sensitive to the power flow direction. In addition, the efficiency is insensitive to the variation in voltage on the low-voltage side. Therefore, the proposed BDC is suitable for the energy storage system with high voltage gain and wide voltage range.
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