Incandescent light regulation and intensity controller

Details Incandescent light regulation and intensity controller Incandescent light regulation and intensity controller

1988-11-14

1990-02-20

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

363 21, 315209R, 315291, 315311, H05B 3702, G05F 156

Patent

active

049029584

ABSTRACT:
A regulation and intensity controller for prolonging the life of an incandescent lamp controls the root mean square voltage across the lamp by converting AC voltage to a DC voltage and by applying the DC voltage to the lamp through a switch and an inductor in series connection with the lamp. The switch is opened and closed according to a duty cycle that will produce a constant average voltage across the lamp. The switch is closed at fixed intervals and is opened by a circuit that is responsive to the instantaneous current through the lamp and to a voltage signal produced by integrating an error signal that represents the difference between the lamp voltage and a reference voltage. In this manner, the average voltage across the lamp is regulated and ripple is kept within a level such that the average voltage is a close representation of root mean square voltage. Additionally, the cycle-by-cycle current through the lamp is closely regulated.

REFERENCES:
patent: 4156166 (1979-05-01), Shapiro et al.
patent: 4422138 (1983-12-01), Kornrumpf
"USHIO Halogen Lamps Technical Specifications", pp. 16-19, Publication, Jun. 1983.
Product Literature entitled "Linear Integrated Circuits, Off-Line Current Mode PWM Controller", published by Unitrode, pp. 2-129 through 2-134, Jan. 1985.

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