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Analysis, Design, and Experimentation on Constant-Frequency DC-DC Resonant Converters With Magnetic Control

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5 Author(s)
Alonso, J.M. ; Electr. & Electron. Eng. Dept., Univ. de Oviedo, Gijon, Spain ; Perdigão, M.S. ; Vaquero, D.G. ; Calleja, A.J.
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In this paper, a new technique for controlling dc-dc resonant converters is investigated. A variable inductance is used to control and regulate the dc output voltage maintaining constant switching frequency for the half-bridge transistors. The output voltage characteristics of the series resonant and parallel resonant converters under the proposed magnetic control are obtained and analyzed. In order to evaluate the proposed technique, a laboratory prototype for a 48 V-input 5 V/10 A-output 500 kHz parallel resonant converter is presented. A methodology for obtaining the converter dynamic response using a step response test is carried out. From the dynamic response, a compensator for operating the converter at closed loop is developed and tested in the laboratory. The results prove that the proposed technique is suitable for controling resonant inverters at constant frequency using a low-cost half-bridge inverter.

Published in:

Power Electronics, IEEE Transactions on  (Volume:27 ,  Issue: 3 )

Date of Publication:

March 2012

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