DSP-based control of multi-rail DC-DC converter systems with non-integer switching frequency ratios

James Mooney, Simon Effler, Mark Halton, Abdulhussain E. Mahdi

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

Abstract

This paper examines the use of non-integer switching frequency ratios in digitally controlled DC-DC converters. In particular the execution of multiple control algorithms using a Digital Signal Processor (DSP) for this application is analyzed. The variation in delay from when the Analog to Digital Converter (ADC) samples the output voltage to when the duty cycle is updated is identified as a critical factor to be considered when implementing the digital control system. Fixing the delay to its maximum value is found to produce reasonable performance using a conventional DSP. A modification of the DSP's interrupt control logic is proposed here that minimizes the delay and thereby yields improved performance compared with that given by a standard interrupt controller. Applying this technique to a multi-rail power supply system provides the designer with the flexibility to choose arbitrary switching frequencies for individual converters, thereby allowing optimization of the efficiency and performance of the individual converters.

Original languageEnglish
Title of host publicationEPC-IQ01 2010 - 2010 1st International Conference on Energy, Power and Control
Pages203-207
Number of pages5
Publication statusPublished - 2010
Event2010 1st International Conference on Energy, Power and Control, EPC-IQ01 2010 - Basrah, Iraq
Duration: 30 Nov 20102 Dec 2010

Publication series

NameEPC-IQ01 2010 - 2010 1st International Conference on Energy, Power and Control

Conference

Conference2010 1st International Conference on Energy, Power and Control, EPC-IQ01 2010
Country/TerritoryIraq
CityBasrah
Period30/11/102/12/10

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