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Automatic multi-phase digital pulse width modulator

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conference contribution
posted on 2017-10-13, 11:29 authored by Simon Effler, MARK HALTONMARK HALTON, Karl Rinne
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 (phase-shedding 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.

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History

Publication

Applied Power Electronics Conference and Exposition (APEC);pp, 1087-1092

Publisher

IEEE Computer Society

Note

peer-reviewed

Other Funding information

IRC

Rights

© 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Language

English

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