Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1997-07-25
2000-03-14
Wong, Don
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315224, 315291, 315DIG4, H05B 3702
Patent
active
060377224
ABSTRACT:
A dimmable electronic ballast for a gas discharge lamp utilizing a modified self-resonant split inductor configuration. The voltage supplied to the lamp load is controlled by varying the duty cycle of the output stage which, in turn, feeds back a driving signal to the boost converter to synchronize the DC voltage with the needs of the load. The circuit also performs power factor and THD control. The ballast circuit controls the start-up of the lamp by proving a warming current to the filaments and then boosts the voltage to strike the lamps. If the lamps are at end-of-life wherein the filaments are intact but vapor and coatings are diminished, the ballast will apply bursts of higher voltage until the lamp strikes. Additionally, if the filaments are open, the circuit stops operation.
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Lee Wilson
Pacific Scientific
Wong Don
LandOfFree
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