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Analysis of CLL Voltage-Output ResonantConverters Using Describing Functions

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5 Author(s)
Martin P. Foster ; Dept. of Electron. & Electr. Eng., Sheffield Univ., Sheffield ; Christopher R. Gould ; Adam J. Gilbert ; David A. Stone
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A new AC equivalent circuit for the CLL voltage-output resonant converter is presented, that offers improved accuracy compared with traditional FMA-based techniques. By employing describing function techniques, the nonlinear interaction of the parallel inductor, rectifier and load is replaced by a complex impedance, thereby facilitating the use of AC equivalent circuit analysis methodologies. Moreover, both continuous and discontinuous rectifier-current operating conditions are addressed. A generic normalized analysis of the converter is also presented. To further aid the designer, error maps are used to demonstrate the boundaries for providing accurate behavioral predictions. A comparison of theoretical results with those from simulation studies and experimental measurements from a prototype converter, are also included as a means of clarifying the benefits of the proposed techniques.

Published in:

IEEE Transactions on Power Electronics  (Volume:23 ,  Issue: 4 )