NDLI: Control of Active Clamp Forward Converters by Independent Primary and Secondary ASICs

Content Provider	IEEE Xplore Digital Library
Author	Degen, P. de Groot, H. Pagano, R. Pansier, F. Schetters, K.
Copyright Year	2007
Description	Author affiliation: NXP Semiconductors, Gerstweg 2, Nijmegen, 6534 AE, The Netherlands. E-mail: frans.pansier@nxp.com (Pansier, F.) \|\| NXP Semiconductors, Gerstweg 2, Nijmegen, 6534 AE, The Netherlands (Degen, P.; de Groot, H.; Pagano, R.; Schetters, K.)
Abstract	This paper proposes an ASIC solution to control a multi-output control-driven active-clamp forward converter devoted to PC power supplies. The primary- and secondary-side switches of the forward converter are driven by dedicated ASIC units. In detail, regulation of the main-switch duty-cycle is achieved by a primary IC implementing feed-forward control, while the outputs of the converter are locally regulated by two ASICs independently from the primary-switch duty-cycle. Since no communication is required during normal mode, the duty-cycle is defined by the the primary IC which controls the main switch is such a way that the primary duty-cycle is larger than the secondary one. Only during stand-by mode, communication between the primary controller and the secondary ones is required to increase the efficiency up to 50%. An opto-coupler device informs the primary side of the converter about the situation occurring at secondary side. Accordingly, the optocoupler communicates to the primary control ASIC the required duty-cycle, or that the primary switch has to be turned off at the occurrence of a failure at secondary side. The low-power mode efficiency is at least 50% at 500 mW load to meet the 1W stand-by requirement, and increases substantially at higher load. Experimental results carried out on a 300W demoboard are reported in this paper.
Starting Page	2326
Ending Page	2331
File Size	865494
Page Count	6
File Format	PDF
ISBN	9781424407545
DOI	10.1109/ISIE.2007.4374969
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-04
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Clamps Switches Switching converters Application specific integrated circuits Communication system control Bidirectional control Power supplies Emergency power supplies Inductance Communication switching
Content Type	Text
Resource Type	Article

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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
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