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Energy based closed form solution of ZCS multiresonant series-parallel converters

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3 Author(s)
Farhangi, S. ; Dept. of Electr. Eng., Tehran Univ., Iran ; Kirchenberger, U. ; Schroeder, D.

Under-resonant operation of an ideal multi-resonant series-parallel power converter (MRSPC) with a capacitive output filter is modeled in this paper. This operation allows zero current switching (ZCS), which is convenient for bipolar devices. The capacitive output filtering reduces the recovery effect of the rectifier diodes and is suitable for high output voltage applications. A closed-form solution is found for this power converter, based on state space analysis using energy concepts. This approach simplifies the mathematical operations and gives better physical insight of the system variables. Based on the model, the steady-state characteristics of this power converter are derived by a simulation program, which are discussed and compared with the series resonant half-bridge power converter (SRHC). The optimum power converter parameters are found for given design requirements using computerized optimization routines. Several design examples are presented and compared with SRHC. The validity of the model is verified by SPICE simulations

Published in:

Power Electronics, IEEE Transactions on  (Volume:11 ,  Issue: 2 )

Date of Publication:

Mar 1996

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