G - Physics – 01 – R
Patent
G - Physics
01
R
324/58
G01R 31/00 (2006.01) H01H 9/16 (2006.01)
Patent
CA 1138045
ABSTRACT An interface circuit for indicating the state of a set of switch contacts having high noise immunity and high reliability. The switch contacts to be monitored are connected in series with the primary winding of a transformer having a magnetic core with a highly rectangular hysteresis loop. A voltage is periodically applied through the switch to the transformer primary. A test pulse of current is then passed through a secondary winding on the transformer. The signal across the secondary winding produced in response to the test pulse current indicates the closed or opened condition of the contacts.
350934
Ketchum David D.
Weiner Nathan K.
Electronics Corporation Of America
Smart & Biggar
LandOfFree
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