LED tube lamp

• US 10,295,125 B2
• Filed: 06/19/2018
• Issued: 05/21/2019
• Est. Priority Date: 09/28/2014
• Status: Active Grant

• Current Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Original Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Inventors: Li, Li-Qin, Jiang, Tao, Yang, Chang, Wang, Bao
• Primary Examiner(s): Tran, Anh Q
• Application Number:
  US16/012,320
• Publication Number:
  US 20180320831A1
• Time in Patent Office: 336 Days
• Field of Search: None
• CPC Class Codes: B23K 1/0016 Brazing of electronic components
• CPC Class Codes: B23K 2101/42 Printed circuits
• CPC Class Codes: B23K 3/047 electric
• CPC Class Codes: C03C 21/002 to perform ion-exchange between alkali ions C03C21/005 takes precedence
• CPC Class Codes: C03C 27/048 consisting of an adhesive specially adapted for that purpose
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/235 Details of bases or caps, i.e. the parts that connect the light source to a fitting; Arrangement of components within bases or caps F21K9/238 takes precedence
• CPC Class Codes: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21K 9/272 Details of end parts, i.e. the parts that connect the light source to a fitting; Arrangement of components within end parts F21K9/278 takes precedence
• CPC Class Codes: F21K 9/275 Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings F21K9/278 takes precedence
• CPC Class Codes: F21K 9/278 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 15/015 Devices for covering joints between adjacent lighting devices; End coverings
• CPC Class Codes: F21V 17/101 permanently, e.g. welding, gluing or riveting
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 25/02 coming into action when lighting device is disturbed, dismounted, or broken
• CPC Class Codes: F21V 25/04 breaking the electric circuit
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 3/061 : the material being glass
• CPC Class Codes: F21V 3/10 : characterised by coatings
• CPC Class Codes: F21V 7/22 : characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
• CPC Class Codes: F21V 7/28 : characterised by coatings
• CPC Class Codes: F21Y 2101/00 : Point-like light sources
• CPC Class Codes: F21Y 2103/00 : Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: F21Y 2103/10 : comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 : Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/37 : Converter circuits
• CPC Class Codes: H05B 45/50 : responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: H05B 6/105 : using a susceptor

Abstract

An LED tube lamp comprises a lamp tube, two end caps attached at two ends of the lamp tube respectively, a power supply disposed in one of the two end caps or separately in both of the end caps, an LED light strip disposed inside the lamp tube and a protective layer disposed on the LED light strip. The LED light strip comprises a mounting region and a connecting region. The plurality of LED light sources is mounted on the mounting region and two soldering pads are disposed on the connecting region. The mounting region and the connecting region are electrically connecting the plurality of LED light sources with the power supply. The protective layer comprises a plurality of first openings arranged on the mounting region for accommodating the LED light sources and two second openings are arranged on the connecting region for accommodating the two soldering pad.

Claims

1. An LED tube lamp, comprising:

a lamp tube;

two end caps, each of the two end caps coupled to a respective end of the lamp tube;

a power supply disposed in one or two end caps;

an LED light strip disposed on an inner circumferential surface of the lamp tube, the LED light strip comprising a mounting region and a connecting region, the mounting region for mounting a plurality of LED light sources, the connecting region having at least two soldering pads, and the mounting region and the connecting region being electrically connected to the plurality of LED light sources and the power supply; and

a protective layer disposed on a surface of the LED light strip, the protective layer having a plurality of first openings to accommodate the plurality of LED light sources and at least two second openings to accommodate the at least two soldering pads.

2. The LED tube lamp as claimed in claim 1, wherein the protective layer further comprises a third opening adjacent to the two second openings.

3. The LED tube lamp as claimed in claim 2, wherein the LED light strip further comprises a fourth opening arranged on the connecting region and corresponding to the third opening on the protective layer, further wherein the third opening and the fourth opening form a through hole.

4. The LED tube lamp as claimed in claim 3, wherein the through hole is arranged between the two soldering pads.

5. The LED tube lamp as claimed in claim 3, wherein the through hole allows a soldering machine to recognize the position of the soldering pads during a soldering process.

6. The LED tube lamp as claimed in claim 1, wherein the LED light strip further comprises a first wiring layer, wherein the plurality of LED light sources are disposed on a first side of the first wiring layer and are electrically connected to the first wiring layer.

7. The LED tube lamp as claimed in claim 6, wherein the LED light strip further comprises a second wiring layer disposed on a second side of the first wiring layer, wherein the second wiring layer is made of metal.

8. The LED tube lamp as claimed in claim 7, wherein the LED light strip further comprises a dielectric layer disposed between the first wiring layer and the second wiring layer.

9. The LED tube lamp as claimed in claim 1, wherein at least one of the two end caps comprises at least one conductive pin electrically connected to the power supply.

10. The LED tube lamp as claimed in claim 1, further comprising a diffusion film coated on a surface of the lamp tube.

11. The LED tube lamp as claimed in claim 10, wherein the diffusion film is coated on an inner surface of the lamp tube.

12. The LED tube lamp as claimed in claim 10, wherein the diffusion film comprises a sheet and covers without contacting the LED light sources.

13. The LED tube lamp as claimed in claim 1, wherein the LED light strip attached to an inner surface of the lamp tube.

14. The LED tube lamp as claimed in claim 1, wherein the power supply comprises a circuit board disposed inside one of the end caps, the circuit board electrically connecting the connecting region.

15. The LED tube lamp as claimed in claim 14, wherein the circuit board is parallel to a longitudinal direction of the lamp tube.

16. The LED tube lamp as claimed in claim 14, wherein the circuit board is perpendicular to a longitudinal direction of the lamp tube.

17. The LED tube lamp as claimed in claim 1, further comprising a first pin and a second pin coupled to one of the two 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, for driving 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.

18. The LED tube lamp as claimed in claim 17, wherein the external driving signal is a low frequency signal having a frequency between 0 and 60 Hz.

19. The LED tube lamp as claimed in claim 17, 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.

20. The LED tube lamp as claimed in claim 19, 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.

21. The LED tube lamp as claimed in claim 17, wherein the LED tube lamp is configured such that the driving circuit does not drive the LED light sources to emit light, when an external driving signal input through one of the first and second pins and the third pin across the two ends of the lamp tube is provided by an electrical ballast.

22. The LED tube lamp as claimed in claim 21, 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.

23. The LED tube lamp as claimed in claim 1, further comprising a first pin and a second pin coupled to one of the two end caps, and a third pin coupled to the other end cap;

and wherein the power supply comprises;

a first rectifying circuit comprising diodes, the first rectifying circuit connected to the first and second pins;

a second rectifying circuit comprising diodes, the 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 to rectify an external driving signal to produce a rectified signal; and

a detection circuit coupled to the first and the 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.

24. The LED tube lamp as claimed in claim 23, wherein the power supply further comprises a driving circuit coupled to the first and the second rectifying circuits and the LED light sources, and configured to drive the LED light sources.

25. The LED tube lamp as claimed in claim 24, wherein when the external driving signal is a low frequency signal from an AC powerline, the driving circuit is configured to drive the LED light sources to emit light.

26. The LED tube lamp as claimed in claim 24, wherein the detection circuit comprises a mode switching circuit coupled to the first and the 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.

27. The LED tube lamp as claimed in claim 23, wherein the first rectifying circuit comprises four diodes, the first pin is connected to a first common node connecting an anode and a cathode respectively of two of the four diodes, and the second pin is connected to a second common node connecting an anode and a cathode respectively of the other two of the four diodes.

28. The LED tube lamp as claimed in claim 27, wherein the second rectifying circuit comprises two diodes having a third common node connecting an anode and a cathode respectively of the two diodes of the second rectifying circuit, and the third common node is coupled to the third pin;

and a common anode of two of the four diodes of the first rectifying circuit is coupled to an anode of one of the two diodes of the second rectifying circuit, and a common cathode of the other two of the four diodes of the first rectifying circuit is coupled to a cathode of the other one of the two diodes of the second rectifying circuit.

29. An LED tube lamp, comprising:

a lamp tube;

two end caps attached at two ends of the lamp tube respectively;

a power supply disposed in one or both of the end caps;

a light strip disposed inside the lamp tube, the light strip comprising a mounting region and a connecting region;

a plurality of LED light sources mounted on the mounting region, the mounting region and the connecting region being electrically connected to the plurality of LED light sources and the power supply;

at least two soldering pads arranged on the connecting region for electrically connecting the power supply;

a recognizing mark arranged on the connecting region; and

a protective layer disposed on the light strip.

30. The LED tube lamp as claimed in claim 29, wherein the protective layer comprises a plurality of first openings arranged on the mounting region for accommodating the LED light sources and at least two second openings arranged on the connecting region for accommodating the at least two soldering pads.

31. The LED tube lamp as claimed in claim 30, wherein the protective layer further comprises a third opening, wherein the third opening comprises the recognizing mark.

32. The LED tube lamp as claimed in claim 31, wherein the LED light strip attached to an inner surface of the lamp tube.

33. The LED tube lamp as claimed in claim 31, wherein the power supply comprises a circuit board disposed inside one of the end caps, and the connecting region electrically coupled to the circuit board.

34. The LED tube lamp as claimed in claim 33, wherein the circuit board is parallel to a longitudinal direction of the lamp tube.

35. The LED tube lamp as claimed in claim 33, wherein the circuit board is perpendicular to a longitudinal direction of the lamp tube.

36. The LED tube lamp as claimed in claim 31, wherein the light strip further comprises a first wiring layer, wherein the protective layer covers a first side of the first wiring layer, and wherein the plurality of LED light sources are disposed on the first side of the first wiring layer and are electrically connected to the first wiring layer.

37. The LED tube lamp as claimed in claim 36, wherein the light strip further comprises a second wiring layer disposed on a second side of the first wiring layer, and wherein the second wiring layer is made of metal.

38. The LED tube lamp as claimed in claim 37, wherein the light strip further comprises a dielectric layer disposed between the first wiring layer and the second wiring layer.

39. The LED tube lamp as claimed in claim 29, wherein at least one of the two end caps comprises at least one conductive pin electrically connected to with the power supply.

40. The LED tube lamp as claimed in claim 39, wherein the LED tube lamp further comprises a diffusion film coated on a surface of the lamp tube.

41. The LED tube lamp as claimed in claim 40, wherein the diffusion film is coated on an inner surface of the lamp tube.

42. The LED tube lamp as claimed in claim 40, wherein the diffusion film comprises a sheet and covers without contacting with the LED light sources.

43. The LED tube lamp as claimed in claim 39, further comprising a first pin and a second pin coupled to one of the two 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 one 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

wherein 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.

44. The LED tube lamp as claimed in claim 43, wherein the external driving signal is a low frequency signal having a frequency between 0 and 60 Hz.

45. The LED tube lamp as claimed in claim 43, 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.

46. The LED tube lamp as claimed in claim 45, 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 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.

47. The LED tube lamp as claimed in claim 43, wherein the LED tube lamp is configured such that the driving circuit does not drive the LED light sources to emit light, when an external driving signal input through one of the first and second pins and the third pin across the two ends of the lamp tube is provided by an electrical ballast.

48. The LED tube lamp as claimed in claim 47, 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.

49. The LED tube lamp as claimed in claim 39, further comprising a first pin and a second pin coupled to one of the two end caps, and a third pin coupled to the other end cap;

and further wherein the power supply comprises;

a first rectifying circuit comprising diodes connected to the first and second pins;

a second rectifying circuit comprising diodes connected to the third pin and an output terminal of the first rectifying circuit, wherein the first and second rectifying circuits are configured to rectify 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 to determine 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.

50. The LED tube lamp as claimed in claim 49, 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.

51. The LED tube lamp as claimed in claim 50, wherein when the external driving signal is a low frequency signal from an AC powerline, the LED tube lamp causes the rectified signal to be used by the driving circuit for driving the LED light sources to emit light.

52. The LED tube lamp as claimed in claim 50, 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.

53. The LED tube lamp as claimed in claim 49, wherein the first rectifying circuit comprises four diodes, the first pin is connected to a first common node connecting an anode and a cathode respectively of two of the four diodes, and the second pin is connected to a second common node connecting an anode and a cathode respectively of the other two of the four diodes.

54. The LED tube lamp as claimed in claim 53, wherein the second rectifying circuit comprises two diodes having a third common node connecting an anode and a cathode respectively of the two diodes of the second rectifying circuit, and the third common node is coupled to the third pin, and a common anode of two of the four diodes of the first rectifying circuit is coupled to an anode of one of the two diodes of the second rectifying circuit, and further wherein a common cathode of the other two of the four diodes of the first rectifying circuit is coupled to a cathode of the other one of the two diodes of the second rectifying circuit.