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SU Mei,CAI Zhiqiang,XIE Shiming,XU Guo,DENG Guoliang,CHEN Xiaoying.Bidirectional LLC-DCX Converter with Constant Voltage Gain and Automatic Power Limitation and Its Modulation Strategy[J].JOURNAL OF POWER SUPPLY,2020,18(3):22-30
Bidirectional LLC-DCX Converter with Constant Voltage Gain and Automatic Power Limitation and Its Modulation Strategy
Received:December 31, 2019  Revised:April 15, 2020
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DOI:10.13234/j.issn.2095-2805.2020.3.22
Keywords:bidirectional isolated DC-DC converter  automotive dual-power system  battery voltage equalization  co-nstant power limitation  constant voltage gain
Fund Project:This work was supported in part by the Project of Innovation-Driven Plan in Central South University under Grant 2019CX003; in part by the Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid under Grant 2018TP1001; in part by the Major Project of Changzhutan Self-Dependent Innovation Demonstration Area under Grant 2018XK2002; and in part by the National Natural Science Foundation of China under Grant 51907206
                 
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SU Mei School of Automation, Central South University, Changsha , China
CAI Zhiqiang School of Automation, Central South University, Changsha , China
XIE Shiming School of Automation, Central South University, Changsha , China
XU Guo School of Automation, Central South University, Changsha , China
DENG Guoliang School of Automation, Central South University, Changsha , China
CHEN Xiaoying School of Automation, Central South University, Changsha , China
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Abstract:
      The dual-power supply(48 V/12 V) system architecture has become a solution for the transition from a 12 V to a 48 V power supply system used in an automotive low-voltage auxiliary power supply system. To improve the efficiency and realize automatic voltage equalization of battery packs, the topology of a bidirectional isolated DC-DC converter with low output voltage and large output current and its control method are studied. Firstly, to reduce the power capacity of the DC-DC converter and the number of battery packs, a hybrid power supply architecture is proposed. Secondly, with the combination of the novel architecture, a synchronized turn-on and turn-off modulation strategy is proposed, which can achieve constant voltage gain of LLC-DCX converters. Thirdly, clamping diodes are added to the conventional LLC converters to limit the inrush current during start-up. In addition, constant power limitation is achieved under the over-load condition. Finally, experiments based on a 720 W(output of 12 V/60 A) LLC converter prototype were conducted th-rough pure analog control to verify the modulation strategy, power distribution and characteristics such as battery voltage equalization, which demonstrates the effectiveness of the proposed solution.
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