Sensing voltage for fluorescent lamp protection
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United States of America Patent
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-
Nov 16, 2004
Grant Date -
Jun 17, 2004
app pub date -
Dec 13, 2002
filing date -
Dec 13, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Problems in fluorescent lamp operation are determined by detecting an increase in voltage on a flyback transformer secondary due to the open circuit flyback effect. A ballast implementing the present invention supplies alternating power to ignite and maintain each lamp. DC power is provided to each filament from a multiple output flyback converter. A voltage level is sensed across at least one filament of each lamp. A determination is made that at least one sensed voltage level exceeds a threshold based on the flyback open circuit voltage.
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