Improved Direct-Coupled High-Bandwidth Voltage Amplifier for B-H Characterization of Magnetic Materials

Ahmad, SS and Raj, A and Narayanan, G (2022) Improved Direct-Coupled High-Bandwidth Voltage Amplifier for B-H Characterization of Magnetic Materials. In: 10th IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2022, 14-17 December 2022, Jaipur.

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Abstract

B-H characteristics of magnetic materials are an essential input to the design of electrical machines and magnetics in power converters. Wide frequency range operation of machines and converters increasingly requires experimental characterization of the magnetic core material at low as well as high frequencies. Therefore, power amplifiers having wide bandwidth, high voltage and current gains, along with low output offset are needed for characterization. Linear closed-loop multistage amplifiers are often used. Direct coupling of amplifier stages is desirable to characterize the magnetic materials at very low frequencies. The middle stage of such linear multi-stage amplifiers provides the voltage gain. A conventional common-emitter based middle voltage gain stage is reviewed first. A folded cascode amplifier with buffered output is proposed as an alternative. This is capable of direct-coupling with the input (differential), and output (current amplification) stages. The proposed amplifier is shown experimentally to yield a high gain-bandwidth product. Experimental results of the proposed voltage amplifier and the closed loop power amplifier are presented. © 2022 IEEE.

Item Type:	Conference Paper
Publication:	10th IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2022
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Analog circuits; Bandwidth; Cascode amplifiers; Coremaking; Gain measurement; Magnetic cores; Power converters; Voltage regulators, Buffered folded cascode; Closed-loop; Common emitter; Direct coupled; Direct coupling; Folded-cascode; Magnetic characterization; Multistage amplifiers; Voltage amplifiers; Voltage gain, Power amplifiers
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	11 May 2023 09:16
Last Modified:	11 May 2023 09:16
URI:	https://eprints.iisc.ac.in/id/eprint/81622

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