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LED tube lamp

  • US 10,021,742 B2
  • Filed: 07/06/2017
  • Issued: 07/10/2018
  • Est. Priority Date: 09/28/2014
  • Status: Active Grant
First Claim
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1. An LED tube lamp, comprising:

  • a lamp tube;

    a heat shrink sleeve covering on an outer surface of the lamp tube;

    an LED light strip in the lamp tube;

    a plurality of LED light sources on the LED light strip;

    two end caps respectively coupled to two opposite ends of the lamp tube, each of the end caps having two pins for receiving an external driving signal; and

    a power supply circuit comprising a plurality of electronic components, all of the electronic components of the power supply circuit being on the light strip, the plurality of the electronic components of the power supply circuit comprising;

    four filtering units, two of the four filtering units being connected in series between the two pins of one of the two end caps, and the other two of the four filtering units being connected in series between the two pins of the other of the two end caps;

    a first current-limiting capacitor and a second current-limiting capacitor, one end of the first current-limiting capacitor connected to a connection node between the two filtering units connected in series, and one end of the second current-limiting capacitor connected to a connection node between the other two filtering units connected in series;

    two rectifying circuits coupled to the LED light sources, one of the rectifying circuits connected to another end of the first current-limiting capacitor and the other rectifying circuit connected to another end of the second current-limiting capacitor; and

    a capacitor connected in parallel with the LED light sources.

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