Output protection for arc discharge lamp ballast
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United States of America Patent
Stats
-
Sep 18, 2001
Grant Date -
N/A
app pub date -
Mar 23, 1999
filing date -
Mar 23, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Output protection for arc discharge lamp ballasts is provided by applying sampled ballast current to a burden capacitor selected to present a low impedance across the winding to a substantially symmetrical waveform of the sample current. Asymmetry between the positive and negative half-cycles of the sample waveform, such as partial rectification caused by abnormal lamp operation, results in charge buildup across the capacitor. Sufficient charge buildup actuates a ballast disabling switch such as a silicon controlled rectifier.
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