NDLI: Current Share in Multiphase DC–DC Converters Using Digital Filtering Techniques

Content Provider	IEEE Xplore Digital Library
Author	Kelly, A.
Copyright Year	1986
Abstract	This paper introduces a new method of passive current balancing for digital control of multiphase DC-DC converters based upon the duty-cycle-matching principle. Current balance is achieved by inserting a digital filter into the control path. The method does not rely on a current balancing loop, and therefore, the stability and performance concerns associated with the traditional current balance loop are obviated. Being sensorless, it is insensitive to current measurement inaccuracies caused by noise, component value tolerance, or variation. It will be shown that effective current balancing can be achieved via some simple modifications to standard voltage-mode control laws, allowing current balancing to be achieved with minor additional complexity. The effectiveness of the method has been demonstrated by experimental validation of a multiphase DC-DC converter. The current share scheme has been shown to perform well dynamically, matching currents cycle by cycle during load steps, and clearly benefiting from the absence of the slow current share loop popular in traditional methods. The proposed current share filter blends well with existing digital controllers. Given the very low complexity in implementing the filter, the degree of matching achieved is exceptional.
Sponsorship	IEEE Power Electronics Society
Starting Page	212
Ending Page	220
Page Count	9
File Size	1043179
File Format	PDF
ISSN	08858993
Volume Number	24
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital filters Filtering Voltage control Bandwidth Digital control Current measurement Stability Inductors Current control Passive filters multiphase Current balance dc–dc converters digital control
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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