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Energies 2017, 10(10), 1573;

LCC Resonant Multilevel Converter for X-ray Applications

Department of Electrical Engineering, University of Oviedo, 33203 Gijón, Asturias, Spain
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 25 July 2017 / Revised: 12 September 2017 / Accepted: 9 October 2017 / Published: 12 October 2017
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Medical X-ray appliances use high-voltage power supplies that must be able to work with very different energy requirements. Two techniques can be distinguished in X-ray medical imaging: fluoroscopy and radioscopy. The former involves low power radiation with a long exposure time, while radioscopy requires large power during short radiographic exposure times. Since the converter has to be designed by taking into account the maximum power specification, it will exhibit a poor efficiency when operating at low power levels. Such a problem can be solved by using a new multilevel LCC topology. This topology is based on a classical series-parallel resonant topology, but includes an additional low-voltage auxiliary transformer whose function depends on the X-ray technique considered. When radioscopy operation is selected, the transformer will allow the power to be shared between two full-bridges. If fluoroscopy mode is activated, the auxiliary full bridge is disconnected and the magnetizing inductance of the auxiliary transformer is used to increase the resonant inductor in order to reduce the resonant currents, thus improving the efficiency of the converter. View Full-Text
Keywords: AC/DC converter; fluoroscopy; high voltage; multilevel; radioscopy; resonant conversion; X-ray AC/DC converter; fluoroscopy; high voltage; multilevel; radioscopy; resonant conversion; X-ray

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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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Pernía, A.M.; Prieto, M.J.; Villegas, P.J.; Díaz, J.; Martín-Ramos, J.A. LCC Resonant Multilevel Converter for X-ray Applications. Energies 2017, 10, 1573.

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