Title: Analysis, design and control of a two stage improved power quality telecommunication power supply

Authors: Shikha Singh; G. Bhuvaneswari; Bhim Singh

Addresses: Department of Electrical Engineering, I.I.T. Delhi, New Delhi 110016, India ' Department of Electrical Engineering, I.I.T. Delhi, New Delhi 110016, India ' Department of Electrical Engineering, I.I.T. Delhi, New Delhi 110016, India

Abstract: This paper deals with the power quality improvement at the utility interface of a telecommunication switched mode power supply (SMPS) of 12 kW rating. The first stage of this SMPS consists of a 6-pulse diode bridge converter that performs ac-dc conversion yielding an unregulated dc voltage. In the second stage, two boost rectifiers are connected together which feed to a boost dc-dc full bridge converter connected to the output load. By means of a closed loop control, appropriate value of third harmonic component of the current is injected using a zig-zag transformer to reduce the current harmonics distortion at the utility interface. A detailed design procedure is presented to select various components of the SMPS system.

Keywords: power quality; boost rectifier; total harmonic distortion; THD; switched mode power supply; SMPS; power factor; boost dc-dc full bridge converter; telecommunications power supply; quality improvement; zig-zag transformers.

DOI: 10.1504/IJPELEC.2012.052428

International Journal of Power Electronics, 2012 Vol.4 No.6, pp.523 - 540

Received: 29 May 2012
Accepted: 02 Dec 2012

Published online: 02 Mar 2013 *

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