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Analysis and design of LCL-type series resonant converter

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1 Author(s)
Bhat, A.K.S. ; Dept. of Electr. Eng., Victoria Univ., BC, Canada

A series resonant converter modified by adding an inductor in parallel with the transformer primary (or secondary) is presented. This configuration is referred to as an “LCL-type series resonant converter”. A simplified steady-state analysis using complex AC circuit analysis is presented. Based on the analysis, a simple design procedure is given. Detailed experimental results obtained from a MOSFET-based 640 W converter are presented to verify the analysis. A narrow variation in switching frequency is required to regulate the output voltage for a very wide change in load, and the converter has load short-circuit capability. It is shown that by placing the parallel inductor on the secondary side, the parasitics of the high-frequency transformer can be used profitably

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Industrial Electronics, IEEE Transactions on  (Volume:41 ,  Issue: 1 )