Hysteresis in a circuit for sensing presence of a plug

Details Hysteresis in a circuit for sensing presence of a plug Hysteresis in a circuit for sensing presence of a plug

1993-04-20

1997-04-15

Krishnan, Aditya

Electrical transmission or interconnection systems

Switching systems

Condition responsive

H01H 4700

Patent

active

056212569

ABSTRACT:
An automatic switched power receptacle includes an outlet receptacle adapted to receive a plug. A relay is connected between the power receptacle and a source of power to selectively power the receptacle. A plug presence sensor in proximity to the receptacle senses presence of a plug in the receptacle. The plug presence sensor comprises a light source and light sensor, the light source and light sensor being disposed on opposite sides of a path of movement of a plug being inserted in the receptacle. An automatic control circuit is connected between the relay and the plug presence sensor for selectively energizing the relay to power the receptacle incident to the sensor sensing presence of a plug.

REFERENCES:
patent: 4970623 (1990-11-01), Pintar
patent: 5164609 (1992-11-01), Poppe et al.
patent: 5418679 (1995-05-01), Crane et al.

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