H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/28, 315/42,
H05B 41/38 (2006.01) H05B 41/295 (2006.01)
Patent
CA 1319735
31 FREQUENCY MODULATION BALLAST CIRCUIT ABSTRACT OF THE DISCLOSURE A ballast circuit is provided for the start-up and operation of gaseous discharge lamps. A power transformer connected to an inductive/capacitive tank circuit drives the lamps from its secondary windings. An oscillator circuit generates a frequency modulated square wave output signal to vary the frequency of the power supplied to the tank circuit. A photodetector feedback circuit senses the light output of the lamps and regulates the frequency of the oscillator output signal. The feedback circuit also may provide input from a remote sensor or from an external computer controller. The feedback and oscillator circuits produce a high- frequency signal for lamp start-up and a lower, variable frequency signal for operating the lamps over a range of light intensity. The tank circuit is tuned to provide a sinusoidal signal to the lamps at its lowest operating frequency, which provides the greatest power to the lamps. The ballast circuit may provide a momentary low-frequency, high power cycle to heat the lamp electrodes just prior to lamp start- up. Power to the lamps for start-up and dimming is reduced by increasing the frequency to the tank circuit, thereby minimizing erosion of the lamp electrodes caused by high voltage.
529907
Kirby Eades Gale Baker
Zeiler Kenneth Theodore
LandOfFree
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