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LED tube lamp

  • US 10,502,372 B2
  • Filed: 03/19/2019
  • Issued: 12/10/2019
  • Est. Priority Date: 03/10/2015
  • Status: Active Grant
First Claim
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1. A light-emitting diode (LED) tube lamp comprising a tube, end caps with contact pins and located on both ends of the tube, a first rectifying circuit and a second rectifying circuit and a filtering circuit that are coupled with the contact pins on the two end caps respectively, and a switch circuitry that is located between the rectifying circuits and the filtering circuit characterized in that the switch circuitry comprises:

  • a first terminal that is coupled with either one or both of the contact pins,a second terminal that is coupled to a ground terminal, anda third terminal that is coupled with the filtering circuit;

    wherein the switch circuitry further comprises a rectifying module, a reference voltage generating unit, a signal capturing unit, a signal processing unit and a transistor;

    a source electrode and a drain electrode of the transistor are connected with the second terminal and the third terminal of the switch circuitry, respectively;

    at least one of the first and the second rectifying circuits served as the rectifying module of the switch circuitry to receive an external driving signal via the first terminal and to output a driving voltage to the reference voltage generating unit;

    the signal capturing unit is used to sample an electric signal passing through the second terminal and the third terminal of the switch circuitry;

    the signal capturing unit is further used to compare the sampled electric signal and a reference signal outputted by the reference voltage generating unit and output a detection result signal;

    the signal processing unit receives the detection result signal and comprises a driver to output a control signal with high-low level to a gate electrode of the transistor,wherein when the contact pin on either end of the LED tube lamp is connected to the external driving signal, if the electric signal sampled by the signal capturing unit is lower than a set value, the switch circuitry will be disconnected;

    if the electric signal sampled by the signal capturing unit equal to or higher than the set value, the switch circuitry will be connected.

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