Dimmable ballast apparatus and method for controlling power delivered to a fluorescent lamp
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United States of America Patent
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Mar 14, 2000
Issued Date -
N/A
app pub date -
Jul 25, 1997
filing date -
Sep 30, 1994
priority date (Note) -
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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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