NDLI: Fault Tolerant Circuit Topology and Control Method for Input-Series and Output-Parallel Modular DC-DC Converters

Content Provider	IEEE Xplore Digital Library
Author	Choudhary, V. Ledezma, E. Ayyanar, R. Button, R.M.
Copyright Year	1986
Abstract	This paper presents a modular, fault tolerant dc-dc converter topology that utilizes common duty ratio control to ensure equal sharing of input voltage and output current in input-series output-parallel configuration. The input-series connection allows the use of low voltage MOSFET's optimized for very low R_DS,ON resulting in lower conduction losses. The common-duty-ratio scheme does not require a dedicated control loop for input voltage or output current sharing. The fault tolerant protection and control scheme accommodates failure of one or more modules, and ensures input voltage and load current sharing among the remaining healthy modules. The design of a new sensing scheme for detection of fault is presented. The analysis of the topology and the underlying principles are presented. The dependence of peak current from the source and in the protection switch in case of failure of a single converter has been analyzed and the various design tradeoff issues are discussed. The theoretical predictions are validated with simulation and experimental results. The proposed method is simple and gives good dynamic response to changes in input, load, and during fault. This topology is especially suited for space applications where a high level of fault tolerance can be achieved through designed redundancy.
Sponsorship	IEEE Power Electronics Society
Starting Page	402
Ending Page	411
Page Count	10
File Size	1516726
File Format	PDF
ISSN	08858993
Volume Number	23
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fault tolerance Circuit topology DC-DC power converters Voltage control Protection Circuit faults Switches Low voltage Fault detection Switching converters modular dc–dc converters Autonomous control common duty ratio fault tolerance input-series and output-parallel (ISOP) input-series connection input-voltage sharing load-current sharing
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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