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LED tube lamp

  • US 10,054,271 B2
  • Filed: 07/27/2017
  • Issued: 08/21/2018
  • Est. Priority Date: 03/10/2015
  • Status: Active Grant
First Claim
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1. A ballast by-pass light-emitting diode (LED) tube lamp having at least a first and second external connection terminal each connected to an opposite side of the ballast by-pass LED tube lamp, comprising:

  • a driving circuit, electrically connected to the first and second external connection terminals for receiving an external driving signal and configured to convert the external driving signal into a lamp driving signal, wherein the external driving signal has a frequency substantially equal to 50 Hz or 60 Hz;

    an LED module, electrically connected to the driving circuit, for receiving the lamp driving signal;

    a current limiting circuit, electrically connected between the at least one of the first and second external connection terminals and the LED module, and configured to limit a current flowing through the external connection terminals and the LED module to less than a predetermined value when being enabled and conduct a current above the predetermined value when being disabled; and

    an electric shock detection circuit, configured to temporarily turn on a detection path of the ballast by-pass LED tube lamp for 10 μ

    s to 30 μ

    s and detect an equivalent impedance of the detection path being turned on,wherein the electric shock detection circuit controls the enable/disable state of the current limiting circuit according to the equivalent impedance.

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