Control of relay opening events

Details Control of relay opening events Control of relay opening events

2005-06-07

2005-06-07

Nolan, Jr., Charles H. (Department: 2854)

Electricity: measuring and testing

Electromechanical switching device

Relay

C361S160000

Reexamination Certificate

active

06903554

ABSTRACT:
An apparatus for measuring an operating parameter of a relay armature operating a pair of relay contacts, and for controlling the voltage that occurs between the pair of relay contacts when they open or close. The apparatus includes a microcontroller that senses a reference voltage, and a sensed voltage signal that comprises a voltage component representing a relay coil voltage, a power supply voltage component, and a voltage component induced by a motion of the armature. The microcontroller uses discrete digital samples of the signals to deduce the operating parameter. The microcontroller provides a control signal to cause the relay to open or close the relay contacts at a time when a predefined voltage occurs therebetween. The predefined voltage can be substantially zero volts. Methods of use of the apparatus to control the opening and closing of relay contacts are described.

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patent: 6768615 (2004-07-01), Liu
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