Electric lamp and discharge devices: systems – Electric switch in the supply circuit
Patent
1977-06-20
1978-11-14
Smith, Alfred E.
Electric lamp and discharge devices: systems
Electric switch in the supply circuit
307252B, 315315, 315DIG7, H05B 3702, H05B 3906, H05B 4104, H05B 4118
Patent
active
041257944
ABSTRACT:
Electronic touch key assembly with a metal probe having touch or keying surfaces through which, when the surfaces are contacted, a capacitive reactive current flows, triggering a switching amplifier through which an electronic valve for controlling brightness of a lamp is opened, including a high resistance serially connected to the touch or keying surfaces, the surfaces being formed of metal and being insulated from one another, a filter and a rectifier connected to the high resistance, the high resistance serving through the filter and the rectifier as a voltage source, a first and a second bistable multivibrator, the voltage source having an output connected to the second bistable multivibrator, the first bistable multivibrator being connected to the second bistable multivibrator and serving as a switching amplifier which, at a defined voltage threshold of the line voltage, sets the second bistable multivibrator into an opposite output state, a PNP transistor having a base, the second bistable multivibrator having an output connected to the base of the PNP transistor for addressing the latter, the electronic valve including a Triac, and the transistor being connected to the Triac for driving the same.
REFERENCES:
patent: 3919596 (1975-11-01), Bellis
patent: 4016453 (1977-04-01), Moennig
patent: 4031408 (1977-06-01), Holz
Camm & Mazzotta, "Light Dimmer Operates with Touch-Contact Switches", Electronic Engineering, pp. 13-14, Jan. 1976.
Brown Boveri & Cie AG
Lerner Herbert L.
Smith Alfred E.
Wise Robert E.
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