Switch with current flow detector

Details Switch with current flow detector Switch with current flow detector

1996-09-26

1998-05-05

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340331, 340332, 34082517, 34081545, 315119, 315129, 315135, G08B 2100

Patent

active

057480940

ABSTRACT:
A switch for use in an AC circuit wired in a three-way switch mode for supplying power to a load, has a first terminal for connection to an external line, second and third terminals for connection respectively to corresponding terminals of a second like switch, and a switch contact for selectively connecting the first terminal to either one of the second and third terminals. A transformer has its primary winding connected between the first terminal and the external line, and its secondary winding deriving an output voltage therefrom. The output voltage is rectified and supplied to a light-emitting diode. The ratio of turns of the windings of the transformer is such that the rectified voltage energizes the light-emitting diode when power is supplied to the load over its normal operating range. The light-emitting diode will thus provide an indication of when power is supplied to the load.

REFERENCES:
patent: 3119046 (1964-01-01), Usher
patent: 4038582 (1977-07-01), Horwinski
patent: 4479170 (1984-10-01), Richardson
patent: 5017837 (1991-05-01), Hanna et al.
patent: 5170068 (1992-12-01), Kwiatkowski et al.

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