Interleaved Buck Converter with Variable Number of Active Phases and a Predictive Current Sharing Scheme

Jakobsen, L.T. and García Suárez, Oscar and Oliver Ramírez, Jesús Angel and Alou Cervera, Pedro and Cobos Márquez, José Antonio and Andersen, M.A.E. (2008). Interleaved Buck Converter with Variable Number of Active Phases and a Predictive Current Sharing Scheme. In: "39th IEEE Power Electronics Specialists Conference (PESC)", 15/06/2008-19/06/2008, Rodas (Grecia). ISBN 978-1-4244-1668-4. pp. 3360-3366.

Description

Title: Interleaved Buck Converter with Variable Number of Active Phases and a Predictive Current Sharing Scheme
Author/s:
  • Jakobsen, L.T.
  • García Suárez, Oscar
  • Oliver Ramírez, Jesús Angel
  • Alou Cervera, Pedro
  • Cobos Márquez, José Antonio
  • Andersen, M.A.E.
Item Type: Presentation at Congress or Conference (Article)
Event Title: 39th IEEE Power Electronics Specialists Conference (PESC)
Event Dates: 15/06/2008-19/06/2008
Event Location: Rodas (Grecia)
Title of Book: Proceedings of IEEE Power Electronics Specialists Conference, 2008 : PESC 2008
Date: 2008
ISBN: 978-1-4244-1668-4
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Automática, Ingeniería Electrónica e Informática Industrial [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The efficiency of an interleaved Buck converter is typically low at light load conditions because of the switching losses in each of the switching stages. Improvements in the converter efficiency can be achieved by dynamically changing the number of active phases depending on the load current. This paper addresses the issues related to the transient response of the converter when the number of active phases is changed by a digital control scheme. The problem arises because the current in the individual phases of the interleaved Buck converter will not be equal immediately after the controller has changed the number of active phases. This paper proposes a current equalisation scheme that adjusts the duty cycle of each phase in a manner that ensures equal average inductor current in all active phases in one or two PWM periods. The current equalisation scheme relies on the measurement of the output current and the knowledge of a few converter parameters and it does not require a measurement of the current in each phase. A digital PWM modulator has been designed that allows the current equalisation scheme to work. Simulations and measurements for a four phase interleaved Buck converter are presented and shows that the predictive current equalisation scheme can equalise the phase currents in a single PWM period.

More information

Item ID: 3359
DC Identifier: http://oa.upm.es/3359/
OAI Identifier: oai:oa.upm.es:3359
Official URL: http://www.thierry-lequeu.fr/data/PESC/PESC2008/index.html
Deposited by: Memoria Investigacion
Deposited on: 16 Jun 2010 10:44
Last Modified: 20 Apr 2016 12:54
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