Variable duty cycle lamp circuit

Details Variable duty cycle lamp circuit Variable duty cycle lamp circuit

1977-03-15

1979-08-07

Smith, Alfred E.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge control discharge device in the supply circuit

315199, 315291, 307252B, 307308, H05B 3702, H05B 3904

Patent

active

041639235

ABSTRACT:
The effect of a three way lamp bulb is achieved with a single filament bulb through the use of a variable duty cycle circuit and a touch control mounted in the base of the lamp. The circuit features a touch control incremented counter which controls the ramp rise rate of a sawtooth generator which is synchronized with the A. C. source. A trigger circuit accepts the sawtooth waveform to produce triac control pulses of time durations dependent upon the ramp rise rate.

REFERENCES:
patent: 3147928 (1964-09-01), Carpenter
patent: 3171066 (1965-02-01), Atkins et al.
patent: 3793557 (1974-02-01), Cramer
patent: 4087702 (1978-05-01), Kirby et al.

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