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Analysis of a Fifth-Order Resonant Converter for High-Voltage DC Power Supplies

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5 Author(s)
Shafiei, N. ; Dept. of Electr. Eng., Islamic Azad Univ., Najafabad, Iran ; Pahlevaninezhad, M. ; Farzanehfard, H. ; Bakhshai, A.
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Power transformer is one of the most complex parts of power converters. The complicated behavior of the transformer is usually neglected in the power converter analysis and a simple model is mostly used to analyze the converter. This paper presents a precise analysis of a fifth-order resonant converter which has incorporated the resonant circuit into the transformer. The derived model, which is based on the accurate model of the power transformer, can fully predict the behavior of the fifth-order resonant converter. The proposed fifth-order resonant converter is able to effectively reduce the range of phase-shift angle from no load to full load for a fixed-frequency phase-shift control approach. Therefore, the converter is able to operate under zero voltage switching during entire load range with a fixed-frequency control method. Also, the proposed converter offers a high gain which leads to a lower transformer turns ratio. A 10-kVDC, 1.1-kW prototype has been prepared to evaluate the performance of the proposed converter. The experimental results exhibit the excellent accuracy of the proposed model and the superiority of the performance compared to the lower order resonant converters, especially for high-voltage applications.

Published in:

Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 1 )

Date of Publication:

Jan. 2013

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