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YANG Yugang,SUN Binbin,YAN Xiaoheng.Optimal Design of Half-bridge LLC Resonant Converter Considering Parasitic Capacitance[J].JOURNAL OF POWER SUPPLY,2019,17(2):57-62
Optimal Design of Half-bridge LLC Resonant Converter Considering Parasitic Capacitance
Received:February 24, 2017  Revised:August 24, 2018
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DOI:10.13234/j.issn.2095-2805.2019.2.57
Keywords:LLC resonant converter  parasitic capacitance  ZVS  optimal design
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
        
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YANG Yugang Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao , China
SUN Binbin Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao , China 1779369046@qq.com
YAN Xiaoheng Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao , China
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Abstract:
      An isolation-type converter with a transformer is prone to be affected by parasitic capacitance, thus reducing the stability of system operation. In this paper, an equivalent circuit model containing transformer parasitic parameters is set up for an LLC resonant converter, and the formula for voltage gain is derived. From the comparison of voltage gain curve with and without parasitic parameters, the influence of parasitic inductance on the selection of inductance ratio and quality factor is analyzed. The effect of parasitic capacitance is considered in the design of parameters, the condition of realizing ZVS for a switching tube is analyzed, and the calculation method for inductance ratio and the range of quality factor are derived. The inductance ratio and quality factor are optimized, thus optimizing various resonance parameters. An experimental prototype was set up, which verified the correctness and feasibility of the optimization method.
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