Lamp circuit with filament current fault monitoring means
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United States of America Patent
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Apr 22, 1997
Issued Date -
N/A
app pub date -
May 14, 1996
filing date -
Mar 3, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A ballast arrangement is disclosed for use in powering fluorescent and other gas discharge lamps. The ballast arrangement controls the arc voltage provide by an arc voltage oscillator independent of the filament voltage provided by a filament voltage oscillator. In this manner, safe maintenance condition during fault and interrupt condition are obtained. The full arc voltage is only applied to the lamp when the lamp filaments are warm or after a time period during which they are warmed. The filament pre-warming time reduces sputtering when an excitation or arc voltage in subsequently applied to induce lamp arcing.
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