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Circuit-Parameter-Based Audiosusceptibility Model for Series Resonant Converter

Joshi, Subhash TG and John, Vinod (2018) Circuit-Parameter-Based Audiosusceptibility Model for Series Resonant Converter. In: IEEE TRANSACTIONS ON POWER ELECTRONICS, 34 (6). pp. 5927-5939.

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Official URL: https://doi.org/ 10.1109/TPEL.2018.2869428

Abstract

Models that accurately predict the output voltage ripple magnitude are essential for applications with stringent performance target for it. Impact of the dc input ripple on the output ripple for a frequency-controlled series resonant converter (SRC) using a discrete-domain exact discretization modeling method is analyzed in this paper. A novel discrete state-space model along with a small-signal model for the SRC considering three state variables is presented. The audiosusceptibility (AS) transfer function that relates the input-to-output ripple is derived from the small-signal model. Analysis of the AS transfer function indicates a resonance peak and an expression is derived connecting the AS resonance frequency for the input ripple based on the SRC component values. Further analysis is done to show that a set of values for the SRC parameter exists, which forms a design space, for which the normalized gain offered by the SRC for the input ripple is less than unity at any input ripple frequency. A test setup to introduce the variable frequency ripple at the input of the SRC for the experimental evaluation of the AS transfer function is developed. Influence of stray parameters on the AS gain, AS resonance frequency, and on the SRC tank resonance frequency is evaluated. An SRC is designed at a power level of 10 kW. The analysis using the derived analyticalmodel, simulations, and experimental results are found to be closely matching.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords: Audiosusceptibility (AS); sampled data modeling; series resonant converter (SRC); small-signal model
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Depositing User: LIS Interns
Date Deposited: 23 May 2019 09:39
Last Modified: 23 May 2019 09:39
URI: http://eprints.iisc.ac.in/id/eprint/62713

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