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LED tube lamp

  • US 9,781,805 B2
  • Filed: 02/28/2016
  • Issued: 10/03/2017
  • 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;

    a first pin and a second pin coupled to the lamp tube, for receiving an external driving signal;

    a first rectifying circuit coupled to the first pin and the second pin and configured to rectify the external driving signal to produce a rectified signal;

    a filtering circuit coupled to the first rectifying circuit and configured to filter the rectified signal to produce a filtered signal;

    an LED lighting module coupled to the filtering circuit and configured to receive the filtered signal for emitting light; and

    a ballast-compatible circuit coupled to the first rectifying circuit and containing a metallic electrode, a bimetallic strip, and a heating filament in an inert gas,wherein the bimetallic strip is connected to the heating filament, and a spacing is configured between the bimetallic strip and the metallic electrode,wherein the bimetallic strip includes two metallic strips, and a first metallic strip of the two metallic strips that is closer to the metallic electrode has a smaller temperature coefficient than that of a second metallic strip of the two metallic strips that is further away from the metallic electrode, andwherein when the external driving signal is initially input at the first pin and second pin, the ballast-compatible circuit will be in an open-circuit state and does not allow the LED tube lamp to emit light, and when the ballast-compatible circuit is in a conduction state, which allows a current input at the first pin and second pin to flow through the LED lighting module, the LED tube lamp emits light.

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