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IEICE TRANSACTIONS on Electronics

Pre-Conditioning Automotive Relay Contacts to Increase Their Resistance to Dynamic Welding

Thomas J. SCHOEPF, Abdellah BOUDINA, Robert D. ROWLANDS, Brent T. REPP

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Summary :

Electromechanical switching devices such as relays may be surprisingly forgiving to occasional, but temporary, electrical stress beyond specification. Consequently delayed openings due to welded contacts on the order of milliseconds usually have been unnoticed and hence have not been reason for concern. However, as electrical systems of vehicles are getting "smarter" and more and more diagnostic routines are being implemented, even such short delay times may be translated as errors. Pre-conditioning contact surfaces has been explored as a measure to increase the welding resistance and eliminate contact opening delays. The 20-A-class relay investigated has been optimized to break occasional current peaks up to 80 ADC.

Publication
IEICE TRANSACTIONS on Electronics Vol.E90-C No.7 pp.1441-1447
Publication Date
2007/07/01
Publicized
Online ISSN
1745-1353
DOI
10.1093/ietele/e90-c.7.1441
Type of Manuscript
Special Section PAPER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from ICEC2006))
Category
Relays & Switches

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