Led tube lamp

Patent metadata

Field	Value
Publication number	US-2018317291-A1
Application number	US-201816026331-A
Country	US
Kind code	A1
Filing date	Jul 3, 2018
Priority date	Sep 28, 2014
Publication date	Nov 1, 2018
Grant date	—

Abstract

An LED tube lamp comprises a tube, an LED light strip inside the tube, a plurality of LED light sources on the LED light strip, a power supply, and a first and a second end caps. The power supply comprises a circuit board, a plurality of electronic components and a heat-dissipating element. The plurality of electronic components and the heat-dissipating element are on the circuit board. The first end cap and the second end cap are respectively attached at two ends of the tube. The first end cap comprises a lateral wall and an end wall having an opening. The lateral wall is substantially coaxial with the tube and connected to the tube. The end wall is substantially perpendicular to an axial direction of the lateral wall and connected to an end of the lateral wall away from the tube. At least some of the plurality of electronic components and the heat-dissipating element are disposed inside the first end cap. The heat-dissipating element is closer to the opening on the end wall of the first end cap than the electronic components in the end cap are.

First claim

What is claimed is:

1 . An LED tube lamp, comprising:
a tube; an LED light strip disposed inside the tube; a plurality of LED light sources mounted on the LED light strip; a power supply comprising a circuit board, a plurality of electronic components and a heat-dissipating element, wherein at least a part of the plurality of electronic components and the heat-dissipating element are on the circuit board; and a first end cap and a second end cap respectively attached at two ends of the tube, each of the first and second end caps comprising a lateral wall and an end wall having an opening, the lateral wall substantially coaxial with the tube and connected to the tube, the end wall substantially perpendicular to an axial direction of the lateral wall and connected to an end of the lateral wall away from the tube, wherein the circuit board is inside the first end cap, and the heat-dissipating element is disposed closer to the opening on the end wall of the first end cap than are the plurality of the electronic components disposed in the first end cap.

2 . The LED tube lamp as claimed in claim 1 , wherein all of the electronic components are disposed inside the first end cap.

3 . The LED tube lamp as claimed in claim 1 , wherein the circuit board is parallel to the axial direction of the lateral wall.

4 . The LED tube lamp as claimed in claim 1 , further comprising a first pin and a second pin coupled to the first end cap, wherein the first pin and the second pin are hollow conductive pins and the power supply electrically connects the first pin and the second pin.

5 . The LED tube lamp as claimed in claim 4 , wherein the heat-dissipating element extends between the circuit board and the end wall of the first end cap, and wherein a portion of the heat-dissipating element is mounted on the circuit board and another portion of the heat-dissipating element is disposed in the opening of the end wall of the first end cap.

6 . The LED tube lamp as claimed in claim 5 , wherein the heat-dissipating element is made of metal.

7 . The LED tube lamp as claimed in claim 1 , further comprising a first pin and a second pin coupled to one of the first and second end caps, and a third pin coupled to the other end cap and wherein the power supply comprises:
a first rectifying circuit connected to the first and second pins; a second rectifying circuit connected to the third pin and an output terminal of the first rectifying circuit, wherein the first and second rectifying circuits are configured for rectifying an external driving signal to produce a rectified signal; and a driving circuit coupled to the first and second rectifying circuits and the LED light sources, and configured to drive the LED light sources, wherein the LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, a first power supply arrangement being that the external driving signal is a low frequency signal input and transmitted through the first and second pins, and a second power supply arrangement being that the external driving signal is a low frequency signal input and transmitted through one of the first and second pins and through the third pin across the two ends of the lamp tube; and the LED tube lamp is configured such that when the external driving signal is a low frequency signal, the LED tube lamp causes the rectified signal to be used by the driving circuit for driving the LED light sources to emit light.

8 . The LED tube lamp as claimed in claim 7 , wherein the external driving signal is a low frequency signal having a frequency between 0 and 60 Hz.

9 . The LED tube lamp as claimed in claim 7 , wherein the first rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode, the first pin is connected to a first common node connecting an anode of the first diode and a cathode of the second diode, and the second pin is connected to a second common node connecting an anode of the third diode and a cathode of the fourth diode.

10 . The LED tube lamp as claimed in claim 9 , wherein the second rectifying circuit comprises a fifth diode and a sixth diode and has a third common node connecting an anode of the fifth diode and a cathode of the sixth diode of the second rectifying circuit, and the third common node is coupled to the third pin, and further wherein a common anode of the second and the fourth diodes of the first rectifying circuit is coupled to an anode of one of the fifth and sixth diodes of the second rectifying circuit, and a common cathode of the first and third diodes of the first rectifying circuit is coupled to a cathode of the other one of the fifth and sixth diodes of the second rectifying circuit.

11 . The LED tube lamp as claimed in claim 7 , wherein when the external driving signal provided by an electrical ballast is input through one of the first and second pins and the third pin across the two ends of the lamp tube, the driving circuit does not drive the LED light sources to emit light.

12 . The LED tube lamp as claimed in claim 11 , wherein when the external driving signal provided by an electrical ballast is input across the two ends of the lamp tube, the rectified signal bypasses at least a component of the driving circuit and the driving circuit drives the LED light sources to emit light.

13 . The LED tube lamp as claimed in claim 1 , further comprising a first pin and a second pin coupled to one of the first and second end caps, and a third pin coupled to the other end cap, and wherein the power supply comprises:
a first rectifying circuit connected to the first and second pins; a second rectifying circuit connected to the third pin and an output terminal of the first rectifying circuit, wherein the first and second rectifying circuits are configured for rectifying an external driving signal to produce a rectified signal; and a detection circuit coupled to the first and second rectifying circuits and the LED light sources, and configured for determining whether to cause the LED light sources to be driven by the rectified signal, or to prevent the LED light sources from being driven by the rectified signal, wherein the LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, a first power supply arrangement being that the external driving signal is input and transmitted through the first and second pins, and a second power supply arrangement being that the external driving signal is input and transmitted through one of the first and second pins and through the third pin across the two ends of the lamp tube.

14 . The LED tube lamp as claimed in claim 13 , wherein the power supply further comprises a driving circuit coupled to the first and second rectifying circuits and the LED light sources and configured to drive the LED light sources.

15 . The LED tube lamp as claimed in claim 14 , wherein when the external driving signal is a low frequency signal from an AC powerline, the driving circuit is configured for driving the LED light sources to emit light.

16 . The LED tube lamp as claimed in claim 14 , wherein the detection circuit comprises a mode switching circuit coupled to the first and second rectifying circuits and the driving circuit, and configured to cause the rectified signal to be used by the driving circuit when the external driving signal is a low frequency signal from an AC powerline.

17 . The LED tube lamp as claimed in claim 14 , wherein the first rectifying circuit comprises a firs

Assignees

• Jiaxing Super Lighting Electric Appliance Co Ltd

Inventors

• Jiang Tao
• Ye Qifeng
• Zhang Yueqiang

Classifications

• H05B45/10

  Controlling the intensity of the light · CPC title

• F21V19/003 Primary

  Fastening of light source holders, e.g. of circuit boards or substrates holding light sources · CPC title

• H05B45/395

  Linear regulators · CPC title

• F21K9/27

  Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes · CPC title

• F21V23/023

  Power supplies in a casing (F21V23/003 takes precedence) · CPC title