Effect of contact capacitance on current-voltage characteristics of stationary metal contacts

Dervos Constantine, T; Michaelides Joseph, M

dc.contributor.author	Dervos Constantine, T	en
dc.contributor.author	Michaelides Joseph, M	en
dc.date.accessioned	2014-03-01T02:41:30Z
dc.date.available	2014-03-01T02:41:30Z
dc.date.issued	1997	en
dc.identifier.issn	03614395	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30498
dc.subject	Charge Injection	en
dc.subject	Charge Transport	en
dc.subject	Contact Area	en
dc.subject	Contact Resistance	en
dc.subject	Current Density	en
dc.subject	current-voltage characteristic	en
dc.subject	Energy Storage	en
dc.subject	Equivalent Circuit	en
dc.subject	Phase Shift	en
dc.subject	Series Resistance	en
dc.subject.other	Capacitance	en
dc.subject.other	Charge transfer	en
dc.subject.other	Current density	en
dc.subject.other	Current voltage characteristics	en
dc.subject.other	Electric impedance	en
dc.subject.other	Equivalent circuits	en
dc.subject.other	Interfaces (materials)	en
dc.subject.other	Interfacial energy	en
dc.subject.other	Silver	en
dc.subject.other	Thermal effects	en
dc.subject.other	Apparent contact areas	en
dc.subject.other	Effective contact areas	en
dc.subject.other	Electric contacts	en
dc.title	Effect of contact capacitance on current-voltage characteristics of stationary metal contacts	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1109/HOLM.1997.638007	en
heal.identifier.secondary	http://dx.doi.org/10.1109/HOLM.1997.638007	en
heal.publicationDate	1997	en
heal.abstract	This paper investigates experimentally the significance of the effective contact capacitance, i.e. the interfacial capacitance during the current flow, for a wide range of stationary metal contacts operating under high charge injection rates. The effective capacitance of metallic interfaces depends on the ratio between the apparent contact area (which is optically determined) and the effective contact area (which injects the electronic charges). Silver contacts having series resistance values significantly less than the contact resistance were subjected to a.c. high current densities (up to 500 A/mm2). The obtained i(t) and v(t) profiles were further analyzed to obtain I-V curves. Due to the phase shift between i(t) & v(t) profiles the I-V curve within a single period of the stimulating current will produce a closed loop. The area of the loop determines the interfacial electrical energy. According to the obtained results the electrical energy storage at a given metal contact, increases at: a) higher ampacity values, b) lower operating temperatures and c) higher clamping forces between the joints (elastic deformation regime) each of the above parameters acting independently. The experimental results were obtained for AgSnO2 and OFHC contacts operated in a wide temperature range, varying between -130 °C and +40 °C. The observed response of the electrical contacts is mainly characterized by the implications of the asperity contact model and dominating charge transport processes across the metallic interfaces. When standard simple equivalent circuits are used to determine contact impedance, the effective capacitance of current carrying metal contacts acquires exceptionally high values.	en
heal.publisher	IEEE, Piscataway, NJ, United States	en
heal.journalName	Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts	en
dc.identifier.doi	10.1109/HOLM.1997.638007	en
dc.identifier.spage	152	en
dc.identifier.epage	164	en