FILAMENT DETECTION CIRCUIT
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United States of America Patent
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-
N/A
Issued Date -
Jul 17, 2014
app pub date -
Jan 15, 2013
filing date -
Jan 15, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A ballast including a driver circuit, a filament heating circuit, a current detector circuit, and a control circuit is provided. The driver circuit generates an oscillating current signal. The filament heating circuit heats filaments of a lamp connected to the ballast and includes a heating transformer with primary and secondary windings and a switching circuit. The primary winding is connected to the driver circuit and the switching circuit. The secondary winding is connected to the primary winding and may be connected to the lamp. The duty cycle of the switching circuit controls current provided from the driver circuit to the primary winding to heat the lamp. The current detector circuit is connected to the switching circuit and detects a parameter of the current in the primary winding, which indicates the number of lamp filaments connected to the ballast. The control circuit controls the driver circuit based on the detected parameter.
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