Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1978-01-30
1980-07-15
Hix, L. T.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307125, 307143, 328 5, H01H 3500
Patent
active
042130611
ABSTRACT:
A bi-directional silicon controlled rectifier forms an electric switch arranged to be connected in an alternating current supply circuit in series with an electric load to be controlled. The gate electrode of the silicon controlled rectifier is connected across the alternating current supply through the input of a full wave rectifier the output of which is connected across a unidirectional silicon controlled rectifier and the gate electrode of which is connected to the output of an oscillator which is controlled by the positive output pulses of a bistable multivibrator. The multivibrator is activated to each of its states by an electric trigger pulse which is generated when a person touches an electrically conductive proximity member connected to one plate of a capacitor, the other plate of which is connected through pulse shaping circuitry to the multivibrator. The output of the rectifier also supplies direct current for operation of the oscillator, multivibrator, proximity plate and shaper circuitry.
REFERENCES:
patent: 3549909 (1970-12-01), Elmsford
patent: 3601621 (1971-08-01), Ritchie
patent: 3666988 (1972-05-01), Bellis
Hix L. T,.
Olson Oliver D.
Schreyer S. D.
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