Development of a switch mode assisted linear amplifier for use as a high fidelity voltage source

Nielsen, Shawn D., Walker, Geoffrey R., & Bailey, Michael L. (2015) Development of a switch mode assisted linear amplifier for use as a high fidelity voltage source. In Power Electronics and Drive Systems (PEDS), 2015 IEEE 11th International Conference on, IEEE (Institute of Electrical and Electronics Engineers), Sydney, Australia, pp. 188-193.

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Abstract

Frequency Domain Spectroscopy (FDS) is one of the major techniques used for determining the condition of the cellulose based paper and pressboard components in large oil/paper insulated power transformers. This technique typically makes use of a sinusoidal voltage source swept from 0.1 mHz to 1 kHz. The excitation test voltage source used must meet certain characteristics, such as high output voltage, high fidelity, low noise and low harmonic content. The amplifier used; in the test voltage source; must be able to drive highly capacitive loads. This paper proposes that a switch-mode assisted linear amplifier (SMALA) can be used in the test voltage source to meet these criteria. A three level SMALA prototype amplifier was built to experimentally demonstrate the effectiveness of this proposal. The developed SMALA prototype shows no discernable harmonic distortion in the output voltage waveform, or the need for output filters, and is therefore seen as a preferable option to pulse width modulated digital amplifiers. The lack of harmonic distortion and high frequency switching noise in the output voltage of this SMALA prototype demonstrates its feasibility for applications in FDS, particularly on highly capacitive test objects such as transformer insulation systems.

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ID Code: 86674
Item Type: Conference Paper
Refereed: No
Keywords: Switch Mode, Amplifier, Transformer, Frequency Domain Spectroscopy, Low Frequency
DOI: 10.1109/PEDS.2015.7203395
ISBN: 9781479944026
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Circuits and Systems (090601)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Power and Energy Systems Engineering (excl. Renewable Power) (090607)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright ©2015 Crown
Deposited On: 20 Aug 2015 05:38
Last Modified: 21 Aug 2015 01:33

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