NDLI: "A Switch Mode Power Supply"

Content Provider	IEEE Xplore Digital Library
Author	Fry, Michael G. J.
Copyright Year	1982
Description	Author affiliation: Bonar Brentford Electric Ltd., Manor Royal, Crawley, W Sussex, RH10 2QF, UK (Fry, Michael G J)
Abstract	A companion paper (New and Wittey) describes a new Power Equipment Rack concept. The present paper describes the design of a SMPS for the new rack. The SMPS operates on 240V 50Hz s.p. A.C., producing a nominal 28A D.C. at a preset level between 52 and 58V D.C. The active element is a power transistor half-bridge switching the transformer primary winding at 20kHz between the centre tap of series connected capacitors across a D.C. link, using PWM for load-dependent regulation. The D.C. link is provided by a f.w. diode bridge across the line, feeding a small reservoir capacitor, topped up by a shunt-transistor (boost) converter giving line-dependent pre-regulation. The rectified transformer output (40kHz) after filtering for ripple and RFI may be used to provide an output of either polarity. A low power auxiliary inverter provides isolated supplies for the transistor base drives. The module is totally enclosed for better mechanical protection and freedom from RFI, and has a single full length `thermal wall' heat sink carrying insulated devices, which forms the mechanical `back bone' of the module. 95% of the drilling and tapping operations are carried out in this heat sink using a steel jig. Almost all interconnections are made using PCB tracks, leaving only a few wire links between PCB and devices. Overall efficiency is better than 90% at f.l.c. and the psophometric ripple is about 1mV. Line power factor is better than 0.97 and fold back current limit below 40V cuts the current back to 2.
Starting Page	277
Ending Page	284
File Size	797037
Page Count	8
File Format	PDF
DOI	10.1109/INTLEC.1982.4793743
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1982-10-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switches Power supplies Switched-mode power supply Power transformer insulation Capacitors Pulse width modulation Radiofrequency interference Heat sinks Power transistors Diodes
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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