LCC Resonant Multilevel Converter for X-ray Applications

A. M. Pernía, Miguel J. Prieto, Pedro J. Villegas, Juan Díaz and Juan A. Martín-Ramos
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A. M. Pernía: Department of Electrical Engineering, University of Oviedo, 33203 Gijón, Asturias, Spain
Miguel J. Prieto: Department of Electrical Engineering, University of Oviedo, 33203 Gijón, Asturias, Spain
Pedro J. Villegas: Department of Electrical Engineering, University of Oviedo, 33203 Gijón, Asturias, Spain
Juan Díaz: Department of Electrical Engineering, University of Oviedo, 33203 Gijón, Asturias, Spain
Juan A. Martín-Ramos: Department of Electrical Engineering, University of Oviedo, 33203 Gijón, Asturias, Spain

Energies, 2017, vol. 10, issue 10, 1-16

Abstract: 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.

Keywords: AC/DC converter; fluoroscopy; high voltage; multilevel; radioscopy; resonant conversion; X-ray (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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