Digital lamp signal processor
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United States of America Patent
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Jan 8, 2002
Grant Date -
N/A
app pub date -
Dec 14, 1999
filing date -
Dec 14, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A digital lamp signal processor senses lamp current and lamp voltage in real time. These two signals are sufficient to obtain information, such as real lamp power calculation, necessary to control ballast operation and fault detection. The apparatus measures the phase of lamp current and voltage, the peak current and voltage, and calculates the average lamp current and voltage. The digital lamp signal processor eliminates the effect of parasitic capacitance of power wiring and a signal condition circuit. It may detect and control hard switching and apply over current and voltage protection. The apparatus directly processes AC signals, allowing for simple and easily integrated single chip design.
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