Equivalent Circuit Analysis for Time-Coordinated Non-arcing Operation of Reed Switches

Noboru WAKATSUKI  Yu YONEZAWA  Atsushi YAMAMOTO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.8   pp.1182-1186
Publication Date: 2006/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.8.1182
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from IS-EMD2005))
Category: Relays & Switches
Keyword: 
reed switch,  arc discharge suppression,  arc ignition,  mechanical contacts,  relay,  

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Summary: 
We proposed a method for suppressing arc ignition in mechanical contact devices using a transient current switch and a capacitor. We applied the method to conventional reed switches. For the electric circuit analysis, we clarified the momentary voltage-current characteristics at breaking operation of reed switches by FEM analysis. We could also estimate the capacitance of the contact electrodes at the metal bridge rupture by FEM analysis, and would derive the non-arcing condition using SPICE simulation. The suitable capacitor value in the transient current circuit for arc ignition suppression would be depend on the load impedance, the power supply, the time depending contact resistance R(t)s, the contact capacitance, and the minimum arc voltage and current.