Rejecting noise transients while turning off a fluorescent lamp using a starter unit
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United States of America Patent
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Jan 26, 2016
Grant Date -
Dec 5, 2013
app pub date -
Aug 7, 2013
filing date -
May 28, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A local minimum of a current monitoring signal is identified by a starter unit that turns off a fluorescent lamp without using a wall switch. Closing a main switch in the starter unit stops an illuminating current from flowing through a gas in the lamp. The local minimum of the current monitoring signal is reached when an increasing valid sample is identified following four valid samples. A sample is valid if it does not differ from the preceding valid sample by more than a threshold difference based on known properties of the signal. By skipping invalid samples, the local minimum is accurately determined to have been reached despite transient noise spikes in the signal that would trip any voltage threshold used to locate the local minimum. When the main switch is opened at a predetermined time after the local minimum, the illuminating current does not again flow through the gas.
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