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Achieving Constant Frequency Operation in DC-DC Resonant Converters through Magnetic Control

Álvarez, J. ; Perdigão, M. ; Gacio, D. Gacio ; Campa, L. Campa ; Saraiva, E. S.

Achieving Constant Frequency Operation in DC-DC Resonant Converters through Magnetic Control, Proc IEEE Energy Conversion Congress and Exposition - ECCE, Atlanta, United States, Vol. xx, pp. xx - xx, September, 2010.

Digital Object Identifier: 10.1109/ECCE.2010.5618109

Abstract
In this paper a new solution to operate dc-dc resonant converters at constant frequency is investigated. The proposed converter is based on the use of a variable inductor to achieve output voltage control and regulation at constant switching frequency. The output voltage characteristics for two typical dc-dc resonant converters operating under this so-called magnetic control are analyzed. As an example, the design of a 48V input 5V/10A output, 500 kHz prototype was carried out. Also, the dynamic behavior of this prototype was investigated by performing a step response test. From this result, a compensator for operating in closed loop was designed and experimented. The obtained results showed that the proposed control method could be a good possibility to achieve constant frequency operation in dc-dc resonant converters.