Automatic multi-phase digital pulse width modulator

Simon Effler, Mark Halton, Karl Rinne

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Current demands on switched-mode power supplies to deliver higher output power with improved efficiency are leading to an increased use of multi-phase power converters. With an increasing number of phases, special multi-phase digital pulse width modulators (DPWMs) prove advantageous over the parallel use of conventional DPWMs. In this paper a "smart" multi-phase DPWM is presented which incorporates a duty cycle distribution algorithm. This algorithm is based on the fastest execution of the duty cycle input command with respect to the number of switching actions per phase and switching cycle. The system provides good dynamic current sharing during transients and enables the use of "faster" digital loop compensators. Intrinsic support of a variable number of active phases (phaseshedding operation) and improved scalability over conventional designs complete the feature set. The proposed system has been implemented on an FPGA system and tested with a four-phase buck converter.

Original languageEnglish
Title of host publicationAPEC 2010 - 25th Annual IEEE Applied Power Electronics Conference and Exposition
Pages1087-1092
Number of pages6
DOIs
Publication statusPublished - 2010
Event25th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2010 - Palm Springs, CA, United States
Duration: 21 Feb 201025 Feb 2010

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Conference

Conference25th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2010
Country/TerritoryUnited States
CityPalm Springs, CA
Period21/02/1025/02/10

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