FHA-based voltage gain function with harmonic compensation for LLC resonant converter

This paper discusses how to improve the accuracy of the gain expression obtained from the First Harmonic Approximation (FHA) for LLC resonant half bridge converter design. By reviewing the approximation, a gain compensation method is developed to improve the accuracy based on harmonic compensation. Theoretical analysis, computer simulation and bench test are presented to demonstrate the effectiveness of the proposed method.

[1]  R. Martinelli,et al.  Steady-state analysis of the LLC series resonant converter , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[2]  C. Adragna,et al.  Design guideline for magnetic integration in LLC resonant converters , 2008, 2008 International Symposium on Power Electronics, Electrical Drives, Automation and Motion.

[3]  Robert L. Steigerwald.  A comparison of half-bridge resonant converter topologies , 1987 .

[4]  Yan Liang,et al.  Optimal design methodology for LLC resonant converter , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[5]  T. Duerbaum.  First harmonic approximation including design constraints , 1998, INTELEC - Twentieth International Telecommunications Energy Conference (Cat. No.98CH36263).

[6]  Hangseok Choi.  Analysis and Design of LLC Resonant Converter with Integrated Transformer , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[7]  C. Adragna,et al.  Design-oriented steady-state analysis of LLC resonant converters based on FHA , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..