Electronic ballast for one or more lamps
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 28, 2001
Grant Date -
N/A
app pub date -
May 1, 2000
filing date -
May 1, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic ballast apparatus for powering one or more gas discharge lamps includes an inverter that is controlled by an inverter control circuit. The inverter control circuit adjusts certain ballast operating characteristics in order to operate the lamps under nearly the same operating conditions irrespective of how many lamps are connected to the ballast. The inverter control circuit includes a lamp quantity sensor, a regulator circuit and an end-of-lamp-life sensor. The lamp quantity sensor provides a lamp quantity signal that indicates how many lamps are connected to the ballast. The regulator circuit includes a reference adjustment circuit that receives the lamp quantity signal and provides a scaled reference signal to a reference terminal of an error amplifier. The error amplifier also has a feedback terminal that receives a signal that is proportional to the power delivered by the inverter to the lamps. The regulator circuit provides a signal to an inverter power control circuit to ensure that the total power delivered by the inverter to the lamps is proportional to the number of lamps connected to the ballast. The lamp quantity signal is also used to adjust the operation of the end-of-lamp-life sensor.
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