Ballast circuit with independent lamp control
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United States of America Patent
Stats
-
Apr 24, 2001
Grant Date -
N/A
app pub date -
Sep 3, 1999
filing date -
Oct 16, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ballast circuit independently energizes first and second lamps. In one embodiment, an inverter provides a drive signal for energizing the first and second lamps. A first signal detection circuit detects a first AC input signal and a second signal detection circuit detects a second AC input signal, each of which energizes a respective one of first and second lamps. A first lamp control circuit receives a signal from the first signal detector such that the first lamp is energized by the drive signal when the first AC input signal is present. Similarly, a second lamp control circuit receives a signal from the second signal detector such that the second lamp is energized by the drive signal when the second AC input signal is present.
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