LED tube lamp compatible with different sources of external driving signal
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United States of America Patent
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Feb 13, 2018
Issued Date -
N/A
app pub date -
Dec 19, 2016
filing date -
Oct 17, 2014
priority date (Note) -
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Abstract
An LED tube lamp is provided. The LED tube lamp includes a lamp tube having at least two external connection terminals, for receiving an external driving signal; a rectifying circuit for rectifying the external driving signal to produce a rectified signal; an LED lighting module comprising an LED module, for emitting light; and a ballast interface circuit coupled between the external connection terminals and the LED lighting module, and comprising a detection circuit configured to determine whether the external driving signal is a high frequency or high voltage signal according to the frequency or voltage level of the rectified signal, wherein the ballast interface circuit is configured such that when the external driving signal is determined to be a high frequency or high voltage signal, the ballast interface circuit causes current conduction in the LED module for emitting light.
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