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Analysis and Implementation of a Fixed-Frequency LCLC Resonant Converter With Capacitive Output Filter

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4 Author(s)
Shafiei, N. ; Inf. & Commun. Technol. Inst., Isfahan Univ. of Technol., Isfahan, Iran ; Pahlevaninezhad, M. ; Farzanehfard, H. ; Motahari, S.R.

This paper presents the steady-state analysis of a fixed-frequency phase-shift LCLC resonant converter with a capacitive output filter which is a very attractive topology for high-voltage applications. A conventional modeling procedure cannot thoroughly describe the converter behavior particularly at the load side. A comprehensive converter analysis is presented, and the obtained analytical expressions precisely describe the converter behavior. This paper shows that the range of zero-voltage-switching operation would extend significantly since the variations of the phase shift can be reduced by this topology. Therefore, high efficiency is achievable for a wide range of operation. This paper also provides some converter practical description for high-voltage implementation. The experimental results obtained from a 1.8-kW prototype verify the theoretical analysis and demonstrate the validity and accuracy of the employed model.

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Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 10 )