Improved utilisation of an HF transformer in DC–AC application

De, Dipankar and Ramanarayanan, V (2011) Improved utilisation of an HF transformer in DC–AC application. In: IET Power Electronics, 4 (5). pp. 508-515.

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Abstract

Power conversion using high frequency (HF) link converters is popular because of compact size and light weight of highfrequency transformer. This study focuses on improved utilisation of HF transformer in DC–AC applications. In practical application, the operating condition of the power converter deviates significantly from the designed considerations. These deviating factors are commutation requirements (dead-time, overlap), mismatch in device drops and presence of the fundamental frequency in load current. As a result, the HF transformer handles some amount of low-frequency components (including DC) other than desired HF components. This causes the operating point in B-H curve to shift away from its normal or idealised position and hence results poor utilisation of the HF transformer and unwanted losses. This study investigates the nature of the problem with experimental determination of approximate lumped parameter modelling and saturation behaviour (B-H curve) of the HF transformer. A simple closed-loop control algorithm with online tuning of the controller parameters is proposed to improve the utilisation of the isolation transformer. The simulation and experimental results are presented.

Item Type:	Journal Article
Publication:	IET Power Electronics
Publisher:	IET Power Electronics
Additional Information:	© Copyright IEEE
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	05 Dec 2011 09:16
Last Modified:	05 Dec 2011 09:16
URI:	http://eprints.iisc.ac.in/id/eprint/42548

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