AC Regulator system for quartz iodine lamps

Details AC Regulator system for quartz iodine lamps AC Regulator system for quartz iodine lamps

1980-04-10

1981-11-10

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315199, 315208, 315311, H05B 3908

Patent

active

043000754

ABSTRACT:
A bank of high power quartz iodine lamps is regulated so that changes in light output from the lamps for a 40 volt change in AC line voltage is reduced from 132% to 10%. To accomplish this, a regulating pulse width modulator is synchronized to the AC line so that pulse width modulated pulses are developed the trailing edge of which is coincident with the zero crossover points of the AC line voltage. The variable leading edge of these width modulated pulses is employed to control the firing point of semiconductor switching devices in series with the lamps, the average voltage across the lamps being sensed and employed by the regulating pulse width modulator to vary the width of the pulses in the correct direction to maintain the lamp voltage constant despite large changes in line voltage.

REFERENCES:
patent: 3670202 (1972-06-01), Paine et al.
patent: 4039897 (1977-08-01), Dragoset
patent: 4155032 (1979-05-01), Schlick et al.

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