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Author

B.N. Brahmendra

Bio: B.N. Brahmendra is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Isolation transformer & Equivalent circuit. The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Papers
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Proceedings ArticleDOI
01 Nov 2011
TL;DR: In this paper, a soft transition push pull converter is proposed, which achieves lossless switching for the two main and two auxiliary switches without increasing the main device current/voltage rating.
Abstract: A novel soft transition push pull converter is proposed in this paper. The proposed circuit achieves loss-less switching for the two main and two auxiliary switches without increasing the main device current/voltage rating. A tapping in the isolation transformer is added for the purpose of commutation. The proposed circuit is capable of operation at elevated switching frequencies of several hundreds of kHz, in a range of line and load variations. Steady state performance, the operating principle and theoretical analysis is outlined for the proposed pushpull converter. The steady state conversion ratio and the equivalent circuit model is presented. Experimental results are presented which verifies the steady state performance of the converter. The experimental waveforms are in agreement with the theoretical.

2 citations


Cited by
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Proceedings ArticleDOI
01 Dec 2012
TL;DR: In this paper, an active soft switching circuit for bridge converters aiming at improving the power conversion efficiency is proposed, which achieves lossless switching for both main and auxiliary switches without increasing the main device current/voltage rating.
Abstract: This paper proposes an active soft-switching circuit for bridge converters aiming at improving the power conversion efficiency. The proposed circuit achieves loss-less switching for both main and auxiliary switches without increasing the main device current/voltage rating. It is capable of operating at elevated switching frequencies of several hundreds of kHz, at low and high power levels with a wide range of load variations. A winding coupled to the primary of power transformer ensures soft switching for the auxiliary switches during turn-on and turn-off. Phase Shifted Full Bridge (PSFB) topology is chosen to validate the design. Operation principle with analytical expressions for the proposed circuit are outlined. The proposed active soft switched PSFB DC-DC converter circuit is designed and implemented for 350 W, switching at 100 kHz. The simulation and experimental results are presented. Experimental results are used to validate the analysis.

4 citations

Journal Article
TL;DR: An active soft-switching circuit for bridge converters aiming to improve the power conversion efficiency and efficiency is proposed, compared with passive soft switched PSFB in terms of efficiency and loss in duty cycle.
Abstract: This paper proposes an active soft-switching circuit for bridge converters aiming to improve the power conversion efficiency. The proposed circuit achieves loss-less switching for both main and auxiliary switches without increasing the main switch current/voltage rating. A winding coupled to the primary of power transformer ensures ZCS for the auxiliary switches during their turn-off. A 350 W, 100 kHz phase shifted full bridge (PSFB) converter is built to validate the analysis and design. Theoretical loss calculations for proposed circuit is presented. The proposed circuit is compared with passive soft switched PSFB in terms of efficiency and loss in duty cycle. Keywords—Active soft switching, passive soft switching, ZVS, ZCS, PSFB.

1 citations