Fluorescent lamp starter unit having a hot socket insert capability
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United States of America Patent
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Feb 18, 2014
Grant Date -
Apr 19, 2012
app pub date -
Oct 13, 2010
filing date -
Oct 13, 2010
priority date (Note) -
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Abstract
A fluorescent lamp starter unit determines whether the lighting fixture into which it has been plugged is in a first or second state. The lamp is on in the first state and off in the second state. If the fixture is in the first state then the starter unit uses a first method to detect ballast type, whereas if the fixture is in the second state then the starter unit uses a second method to detect ballast type. In one example, the first method involves turning on the power switch of the starter unit at a time after a zero-crossing and then using the periodicity of a transient switch current signal to determine ballast type, whereas the second method involves turning on the power switch at the time of the zero-crossing and then using peak amplitude information of the transient switch current to determine ballast type.
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