Interface circuit for use with electronic control devices

Details Interface circuit for use with electronic control devices Interface circuit for use with electronic control devices

1979-05-03

1981-06-09

Moore, David K.

Electricity: measuring and testing

Electromechanical switching device

324 51, 324 52, G01R 3102

Patent

active

042727251

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.

REFERENCES:
patent: 3774106 (1973-11-01), MacPhee
patent: 3869664 (1975-03-01), Safer et al.

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