Lamp adaptable ballast circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 2, 2001
Grant Date -
N/A
app pub date -
Oct 16, 1998
filing date -
Oct 16, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ballast circuit for energizing a lamp comprises a circuit for limiting and/or regulating signal levels to the lamp. In one embodiment, the ballast comprises a control circuit which regulates the lamp current to a predetermined level such that the ballast can drive lamps having a predetermined diameter, which determines the operating current, and having a length that can vary, which determines the voltage drop across the lamp. In another embodiment, the ballast comprises a threshold circuit for limiting a load current prior to striking the lamp as well as after the lamp conducts current.
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