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Energies 2015, 8(3), 1848-1864; doi:10.3390/en8031848

A Linearized Large Signal Model of an LCL-Type Resonant Converter

Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau SAR, China
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Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 10 January 2015 / Revised: 27 February 2015 / Accepted: 27 February 2015 / Published: 5 March 2015
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Abstract

In this work, an LCL-type resonant dc/dc converter with a capacitive output filter is modeled in two stages. In the first high-frequency ac stage, all ac signals are decomposed into two orthogonal vectors in a synchronous rotating d–q frame using multi-frequency modeling. In the dc stage, all dc quantities are represented by their average values with average state-space modeling. A nonlinear two-stage model is then created by means of a non-linear link. By aligning the transformer voltage on the d-axis, the nonlinear link can be eliminated, and the whole converter can be modeled by a single set of linear state-space equations. Furthermore, a feedback control scheme can be formed according to the steady-state solutions. Simulation and experimental results have proven that the resulted model is good for fast simulation and state variable estimation. View Full-Text
Keywords: resonant converter; multi-frequency modeling; soft-switching resonant converter; multi-frequency modeling; soft-switching
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, H.-Y.; Li, X.; Lu, M.; Hu, S. A Linearized Large Signal Model of an LCL-Type Resonant Converter. Energies 2015, 8, 1848-1864.

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