Journal of East China Normal University(Natural Sc ›› 2013, Vol. 2013 ›› Issue (5): 119-129.

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Simplified time domain model of full-bridge LLC resonant converter and its application

XIAO Wen-ying, DONG Hai-bing   

  1. School of Electrical and Information Engineering, Hunan Institute of Technology, Hengyang Hunan 421002, China
  • Received:2012-11-01 Revised:2013-02-01 Online:2013-09-25 Published:2013-09-30

Abstract: Full bridge LLC resonant converter was studied, and a simplified time domain model was proposed based on the state equation of different modes and their related boundary equations based on deep analyze of time domain working mode of LLC resonant converter. Based on this model, gain curve of LLC resonant converter was deduced which is very important for the design of LLC resonant design. Using this presented model and its relating gain curve, LLC resonant tank design method based on magnetizing inductance Lm and inductance ratio h was proposed. Finally, a three-hundred-watt prototype was designed and build, simulated and experimental result verified the accuracy of the time domain model and the feasibility of the design method.

Key words: LLC resonant converter, simplified time domain model, gain curve, design of resonant converter tank

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