Current sharing in parallel connected boost converters

M.R. Geetha; R. Suja Mani Malar; T. Ahilan

Current sharing in parallel connected boost converters

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Author(s): M.R. Geetha¹ ; R. Suja Mani Malar² ; T. Ahilan³
- Affiliations: 1: Department of ECE , Ponjesly College of Engineering , Alamparai, Nagercoil , India ;
  2: Department of Electrical and Electronics Engineering , Narayanaguru Siddhartha College of Engineering , Nattalam, Kanyakumari District , India ;
  3: Department of Mechanical Engineering , Immanuel Arasar JJ College of Engineering , Marthandam, Kanyakumari District , India
Source: Volume 2016, Issue 12, December 2016, p. 444 – 452
DOI: 10.1049/joe.2016.0238 , Online ISSN 2051-3305

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)

Received 26/08/2016, Accepted 19/09/2016, Published 28/10/2016

Parallel connection of converter modules results in generation of higher output current. Improper current sharing takes place if parameters of two converter modules are different. This study proposes a new current-sharing scheme for parallel connected boost converters. This current-sharing scheme control converter output by proper selection of transistor switch current. In this case, converter duty ratio is not adjusted directly. The adjustment of converter duty ratio depends on inductor current, capacitor voltage and power input voltage of converter. Stability of the proposed current-sharing scheme is increased by adding artificial ramp to transistor switch current. The effects of adding artificial ramp are analysed and discussed. The proposed current-sharing scheme is compared with existing current-sharing scheme whose converter output is regulated by direct choice of duty ratio. The proposed system is implemented in real time using PIC16F877A. Simulation and experimental results verify the effectiveness of the proposed current-sharing scheme.

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