Fast detection of contact status with AC wetting voltage...

Details Fast detection of contact status with AC wetting voltage... Fast detection of contact status with AC wetting voltage...

2009-05-11

2011-10-11

Trieu, Van T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S635000, C340S657000

Reexamination Certificate

active

08035528

ABSTRACT:
Fast detection of contact status with an AC wetting voltage using a ratiometric approach is described herein. In one embodiment, a voltage source wets the contact with a wetting voltage. A contact voltage monitor receives voltage obtained from the contact and converts the voltage to a first frequency output. A wetting voltage monitor receives wetting voltage provided from the voltage source to the contact and converts the sensed wetting voltage to a second frequency output. A processor generates a ratio between the first frequency output and the second frequency output and determines the status of the contact and the field wires associated with the contact in accordance with the generated ratio.

REFERENCES:
patent: 5929663 (1999-07-01), Dougherty

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