Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1987-05-06
1990-06-26
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361181, 307117, 307157, 307141, 315307, 315360, 315DIG4, 323907, H05B 3702
Patent
active
049377027
ABSTRACT:
An apparatus for controlling the intensity and on/off status of an incandescent light bulb as a function of the proximity of an object to a sensing plate. The frequency of a signal is varied from a nominal value when the presence of the object is sensed. A pulse is generated having a duration proportional to the time over which the signal if varied from its nominal frequency. The duration of the generated pulse, in relation to a pulse of predetermined width, is used to control a gated oscillator. The output of the gated oscillator is counted. The count obtained is used to control the operation of a TRIAC, which in turn connects power to the incandescent bulb.
REFERENCES:
patent: 4087702 (1978-05-01), Kirby et al.
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patent: 4246533 (1981-01-01), Chiang
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patent: 4651022 (1987-03-01), Cowley
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patent: 4684822 (1987-08-01), Angott
Fukumitsu Minoru
Pellinen A. D.
Williams H. L.
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