Optimum Trajectory Switching Control for Series-Parallel Resonant Converter

The series-parallel resonant converter (SPRC) is known to have combined merits of the series resonant converter (SRC) and PRC. However, the SPRC has a three-element LCC structure with complex transient dynamics, and without control of the resonant circuit's dynamics, the converter's closed-loop bandwidth to switching-frequency ratio will be much reduced compared to that of pulsewidth-modulation (PWM) converters. This paper presents the optimal trajectory enabling any SPRC's steady state be achieved within one cycle. Dynamics using the state-plane analysis is presented, and the optimal state trajectory for transients is derived. Experimental results with comparison to frequency control show much reduced resonant circuit response time for step changes in output voltage. This improved resonant circuit control allows subsequent current and voltage-loop controls of the SPRC to be treated as that of a conventional PWM voltage source

[1]  Fred C. Lee,et al.  Resonant Power Processors, Part II-Methods of Control , 1985, IEEE Transactions on Industry Applications.

[2]  Vivek Agarwal,et al.  Small signal analysis of the LCC-type parallel resonant converter using discrete time domain modeling , 1995, IEEE Trans. Ind. Electron..

[3]  Fred C. Lee,et al.  Implementation of optimal trajectory control of series resonant converter , 1987, IEEE Power Electronics Specialists Conference.

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

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

[6]  Vivek Agarwal,et al.  Large signal analysis of the LCC-type parallel resonant converter using discrete time domain modeling , 1994 .

[7]  King Jet Tseng,et al.  Optimum trajectory switching control for series parallel resonant converter , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[8]  Marian K. Kazimierczuk,et al.  Analysis of series-parallel resonant converter , 1993 .

[9]  C. Q. Lee,et al.  High-frequency high-order parallel resonant converter , 1989 .

[10]  Y.K.E. Ho,et al.  Dynamic characteristics and closed-loop performance of the series-parallel resonant converter , 1996 .

[11]  S.B. Dewan,et al.  Analysis and design of a high frequency resonant converter using LCC type commutation , 1986, 1986 17th Annual IEEE Power Electronics Specialists Conference.

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

[13]  Y.K.E. Ho,et al.  High performance control of the series-parallel resonant converter , 1997 .

[14]  Ramesh Oruganti,et al.  Resonant-tank control of parallel resonant converter , 1993 .

[15]  F. Lee,et al.  Resonant power processors. II - Methods of control , 1984 .