Analytic solutions for LLCC parallel resonant converter unify the design and analysis of two- and three-element converters

A practical method for the steady-state design of parallel resonant DC/DC power converters is presented. The method uses a set of pre-derived equations from an LLCC-type series-parallel resonant converter (LLCC-SPRC). Although four tank elements are used in an LLCC-SPRC, only two ratios of these tank elements are needed during design. The values of the four tank elements can be found from the design results. In addition to designing an LLCC-SPRC, the prederived equations can also be used to design and analyze conventional LCC-type series-parallel (LCC-SPRC), LLC-type parallel (LLC-PRC), and LC-type parallel (LC-PRC) resonant power converters. In other words, four power converters can be designed by the same equations. A design procedure along with design examples is given. Experimental circuits are implemented and measured based on the design results to verify the validity of the derived equations and the design procedure.

[1]  Issa Batarseh,et al.  Resonant converter topologies with three and four energy storage elements , 1994 .

[2]  R. Oruganti.  State-plane analysis of resonant converters , 1987 .

[3]  Arthur F. Witulski,et al.  Simple design of selected 3-element converters by scaling the solution of the LC parallel resonant converter , 1996, Proceedings of Applied Power Electronics Conference. APEC '96.

[4]  C. Q. Lee,et al.  Steady state analysis of the parallel resonant converter with LLCC-type commutation network , 1989, 20th Annual IEEE Power Electronics Specialists Conference.

[5]  Robert W. Erickson,et al.  Steady-state analysis and design of the parallel resonant converter , 1986, 1986 17th Annual IEEE Power Electronics Specialists Conference.

[6]  K. Harada,et al.  Resonant converter controlled by variable capacitance devices , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.

[7]  I. Batarseh,et al.  Steady state analysis and performance characteristics of the LLC-type parallel resonant converter , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[8]  R. P. Severns,et al.  Topologies for three-element resonant converters , 1992 .

[9]  Marian K. Kazimierczuk,et al.  State-plane analysis of zero-current-switching resonant DC/DC power converters , 1989 .

[10]  K. Harada,et al.  A new method to regulate resonant converters , 1988 .

[11]  Ashoka K. S. Bhat.  Analysis and design of a series-parallel resonant converter , 1993 .