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Light emitting diode (LED) tube lamp

  • US 9,801,240 B2
  • Filed: 03/10/2016
  • Issued: 10/24/2017
  • 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 lamp tube;

    four pins coupled to the lamp tube for receiving an external driving signal;

    a first rectifying circuit, coupled to two of the four pins to rectify the external driving signal;

    a second rectifying circuit, coupled to another two of the four pins to rectify the external driving signal;

    a filtering circuit, coupled to the first and the second rectifying circuits to filter rectified signal; and

    an LED lighting module, coupled to the filtering circuit to receive filtered signal to emit light,wherein, the first rectifying circuit further includes a terminal adapter circuit for providing four terminals correspondingly coupled to the four pins to make the LED tube lamp be compatible with an AC driving mode and a ballast driving mode, and the terminal adapter circuit includes a first capacitor, a second capacitor, and a third capacitor, the first capacitor has one end coupled to at least one of two of the four pins and the other end coupled to one end of the second capacitor and one end of the third capacitor, and the other end of the second capacitor and the other end of the third capacitor are correspondingly coupled to the other two of the four pins;

    wherein, the LED lighting module further includes a driving circuit having a controller and a converter circuit, the controller is configured to receive a current detection signal for controlling a driving signal output by the converter circuit to be above an objective current value, and the controller is further coupled to the filtering circuit for setting the objective current value according to a voltage output by the filtering circuit; and

    wherein, the LED tube lamp further includes an over voltage protection circuit coupled to the filtering circuit for detecting a filtered signal, and the over voltage protection circuit is configured to clamp the filtered signal when determining the filtered signal is higher than a defined over voltage protection value.

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