NDLI: Development of an Efficient, Lightweight Switched-Mode Power Supply for Telecommunications Network Use

Content Provider	IEEE Xplore Digital Library
Author	Yotsumoto, Katsuichi Ohashi, Yasuo Kuwata, Yutaka
Copyright Year	1986
Description	Author affiliation: NTT Electrical Communications Laboratories, 3-9-11, Midori-cho, Musashino-shi, Tokyo, 180 JAPAN (Yotsumoto, Katsuichi; Ohashi, Yasuo; Kuwata, Yutaka)
Abstract	This paper discusses the development of an efficient, lightweight switched-mode power supply (SMPS) for reducing cost and energy consumption and for simplifying essential maintenance procedures at small telephone offices. This SMPS consists of a voltage regulator, control circuits, protection circuits and five rectifier units including one redundant unit. Each rectifier unit weighs only 9 kg and can be handled by one person during maintenance. These features are realized through the employment of a single-ended forward-type 20-kHz conversion circuit. Furthermore, an effective decrease in rectifier unit weight and power loss is accomplished by designing the input filter to suppress high-frequency voltage ripple only, while designing for low-frequency voltage ripple to be absorbed in the conversion circuits. The efficiency of each rectifier unit is maximized by developing and using a new high-speed, high-voltage transistor for the conversion circuit and by improving the winding methods used in fabricating the transformer and the inductor, as well as by a loss reduction technique for the input filter. Accordingly, this SMPS can convert 200-volt, three-phase AC power to 48-volt DC with better than 90% efficiency, and it can supply output power up to 5 kW.
Starting Page	25
Ending Page	30
File Size	5953456
Page Count	6
File Format	PDF
ISBN	096923161X
DOI	10.1109/INTLEC.1986.4794400
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1986-10-19
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switched-mode power supply Circuits Rectifiers Filters Costs Energy consumption Telephony Regulators Voltage control Telecommunication control
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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