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US 6,259,215 B1Granted
Electronic high intensity discharge ballast
AssigneeRomlight International, Inc.
InventorDaniel Roman
Life of this patent
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Abstract
A microprocessor controlled high frequency electronic ballast for gas discharge lamps in which the dimming is accomplished by varying the frequency of the square wave generated by the ballast. Prior to ignition the ballast generates a high frequency square wave to preheat the lamp filament. The microprocessor, which is programmable, controls the operating and preheating frequencies of the ballast. The ballast demonstrates very few losses due to the efficiency gained by operating at high frequencies.
Claims10
An electronic high intensity discharge ballast for an illumination device comprising:
- (a) rectifying circuitry for rectifying an alternating current to a direct current;
- (b) power factor correction circuitry for boosting the voltage to be supplied to said illumination device;
- (c) a pair of MOSFET's for generating a square wave for filament preheating and powering said illumination device;
- (d) a programmable microprocessor for monitoring and controlling said power factor circuitry and said MOSFET's;
- and
- (e) dimming circuitry for controlling the amount of dimming by varying the operating frequency of the MOSFET's;
- wherein the microprocessor controls the MOSFET's to generate a first high frequency square wave for filament preheating followed by a second high frequency square wave for powering said illumination device.
4 more elements
Dependencies are inferred from the claim text.