LED tube lamp

• US 10,670,197 B2
• Filed: 04/30/2019
• Issued: 06/02/2020
• 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:
  US16/399,004
• Publication Number:
  US 20190257480A1
• Time in Patent Office: 399 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:

an illuminating region comprising at least a portion of a lamp tube;

two non-illuminating regions, each of the two non-illuminating regions coupled to a respective end of the illuminating region and comprising an end cap coupled to a respective end of the lamp tube;

a power supply module disposed in one or two of the non-illuminating regions;

an LED light strip disposed in the LED tube lamp, the LED light strip comprising a mounting region disposed in the illuminating region and a connecting region disposed in one of the non-illuminating regions, the mounting region attached to an inner circumferential surface of the lamp tube;

a plurality of LED light sources mounted on the mounting region;

at least two soldering pads arranged on the connecting region, the mounting region and the connecting region being electrically connected to the plurality of LED light sources and the power supply module; and

a protective layer disposed on a surface of the LED light strip, the protective layer comprising a plurality of first openings arranged on the mounting region for disposing the plurality of LED light sources and at least two second openings arranged on the connecting region for disposing the at least two soldering pads.

2. The LED tube lamp as claimed in claim 1, wherein the illuminating region comprises at least a portion of the lamp tube, the mounting region of the LED light strip and the plurality of LED light sources, and the two non-illuminating regions comprises two end caps, at least a portion of the connecting region and the power supply module.

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

4. The LED tube lamp as claimed in claim 3, 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.

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

6. The LED tube lamp as claimed in claim 4, wherein the through hole allows a soldering machine to recognize the position of the soldering pads during a soldering process.

7. The LED tube lamp as claimed in claim 2, wherein the LED light strip further comprises a first wiring layer, 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.

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

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

10. The LED tube lamp as claimed in claim 7, 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 power supply module comprises a circuit board disposed in one of the two non-illuminating regions, and the circuit board is electrically connected to the connecting region via the at least two soldering pads.

13. The LED tube lamp as claimed in claim 12, wherein the circuit board is parallel to a longitudinal direction of the lamp tube.

14. The LED tube lamp as claimed in claim 2, wherein the power supply module comprises:

a rectifying circuit, having a first input terminal electrically connected to a pin disposed on one of the two end caps and a second input terminal electrically connected to a pin disposed on the other one of the two end caps,

wherein the rectifying circuit produces a rectified signal between a first rectifying output terminal and a second rectifying output terminal.

15. The LED tube lamp as claimed in claim 14, wherein the rectifying circuit comprises:

a first rectifying diode, having an anode connected to the second rectifying output terminal and a cathode connected to the second input terminal;

a second rectifying diode, having an anode connected to the second rectifying output terminal and a cathode connected to the first input terminal;

a third rectifying diode, having an anode connected to the second input terminal and a cathode connected to the first rectifying output terminal; and

a fourth rectifying diode, having an anode connected to the first input terminal and a cathode connected to the first rectifying output terminal.

16. The LED tube lamp as claimed in claim 15, wherein the power supply module further comprises:

a first filtering unit, electrically connected to the first and the second rectifying output terminals to receive the rectified signal, and configured to produce a filtered signal.

17. The LED tube lamp as claimed in claim 16, wherein the first filtering unit comprises:

a first capacitor, having an end electrically connected to the first rectifying output terminal and the other end electrically connected to the second rectifying output terminal.

18. The LED tube lamp as claimed in claim 17, wherein the power supply module further comprises:

a second filtering unit, electrically connected between the first input terminal and the pin coupled to the first input terminal.

19. The LED tube lamp as claimed in claim 18, wherein the second filtering unit comprises:

an inductor, having an end connected to the pin coupled to the first input terminal and the other end connected to the first input terminal.

20. The LED tube lamp as claimed in claim 18, wherein the power supply module further comprises:

a third filtering unit, electrically connected between one of the two pins and one of the rectifying diodes of the rectifying circuit.

21. The LED tube lamp as claimed in claim 20, wherein the third filtering unit comprises:

an EMI-reducing capacitor, connected between the pin coupled to the first input terminal and the anode of the third rectifying diode.

22. The LED tube lamp as claimed in claim 17, wherein the power supply module further comprises:

a driving circuit, electrically connected to the first filtering unit to receive the filtered signal and configured to perform power conversion for converting the filtered signal into a driving signal,

wherein the LED light sources receive the driving signal from output terminals of the driving circuit for emitting light.

23. The LED tube lamp as claimed in claim 22, wherein the driving circuit comprises:

a controller;

a switch, having a first terminal electrically connected to the end of the first capacitor, a second terminal, and a control terminal coupled to the controller, wherein the switch is turned on or off in response to a signal received from the controller;

a diode, having an anode electrically connected to the other end of the first capacitor and a cathode electrically connected to the second terminal of the switch;

an inductor, having an end electrically connected to the second terminal of the switch, and another end electrically connected to the LED light sources via one of the driving output terminals; and

a second capacitor, having an end electrically connected to the another end of the inductor and the other end electrically connected to the LED light sources via the other one of the driving output terminals.

24. The LED tube lamp as claimed in claim 22, wherein the power supply module further comprises:

an installation detection module, configured to detect a signal passing through the first and the second installation detection terminals and determine whether to cut off the driving signal based on a detected result.

25. The LED tube lamp as claimed in claim 24, wherein the installation detection module comprises:

a switch circuit, having a first terminal electrically connected to the second rectifying output terminal via a first installation detection terminal, a second terminal electrically connected to the other end of the first capacitor via a second installation detection terminal, and a control terminal for receiving a control signal,

wherein the switch circuit controls the state between conducting or cut off between the first and the second installation detection terminals according to the control signal.

26. The LED tube lamp as claimed in claim 25, wherein the installation detection module comprises:

a detection result keeping circuit, electrically connected to the control terminal of the switch circuit and configured to output and keep a high logic level signal when the LED tube lamp is operated in an operating stage.

27. The LED tube lamp as claimed in claim 25, wherein the installation detection module comprises:

a detection pulse generating module, electrically connected to the control terminal of the switch circuit and configured to generate a pulse signal as the control signal when the LED tube lamp is operated in a detection stage.

28. The LED tube lamp as claimed in claim 27, wherein the installation detection module further comprises:

a detection determining circuit, electrically connected to the control terminal of the switch circuit and configured to perform detection based on the pulse signal and generate a detection result for indicating whether to enter an operating stage from the detection stage.

29. The LED tube lamp as claimed in claim 2, further comprising a first pin, a second pin and a third pin, two of the three pins coupled to one of the end caps and the other one of the three pins coupled to the other one of the end caps, wherein the power supply module comprises:

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

a second rectifying circuit connected to the third pin and an output terminal of the first rectifying circuit.

30. The LED tube lamp as claimed in claim 29, wherein the power supply module further comprises a driving circuit coupled to the first and second rectifying circuits for driving the LED light sources, further wherein the LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, the first power supply arrangement being that the external driving signal is transmitted through the first and second pins, and the second power supply arrangement being that the external driving signal is transmitted through one of the first and second pins and through the third pin.

31. The LED tube lamp as claimed in claim 30, 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.

32. The LED tube lamp as claimed in claim 31, 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.

33. The LED tube lamp as claimed in claim 32, the power supply module further comprises 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.

34. The LED tube lamp as claimed in claim 33, wherein when the external driving signal is a low frequency signal having a frequency between 0 and 60 Hz from an AC powerline.

35. An LED tube lamp, comprising:

an illuminating region comprising at least a portion of a lamp tube;

two non-illuminating regions, each of the two non-illuminating regions coupled to a respective end of the illuminating region and comprising an end cap coupled to a respective end of the lamp tube;

a power supply module disposed in one or both of the non-illuminating regions;

an LED light strip disposed in the LED tube lamp, the LED light strip comprising a mounting region disposed in the illuminating region and a connecting region disposed in one of the non-illuminating regions, the mounting region attached to an inner circumferential surface of the lamp tube;

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 module;

at least two soldering pads arranged on the connecting region and electrically connecting to the power supply module;

a recognizing mark arranged on the connecting region; and

a protective layer disposed on the light strip.

36. The LED tube lamp as claimed in claim 35, wherein the illuminating region comprises at least a portion of the lamp tube, the mounting region of the LED light strip and the plurality of LED light sources, and the two non-illuminating regions comprises two end caps, at least a portion of the connecting region and the power supply module.

37. The LED tube lamp as claimed in claim 36, wherein the protective layer comprises a plurality of first openings arranged on the mounting region for disposing the LED light sources and at least two second openings arranged on the connecting region for disposing the two soldering pads.

38. The LED tube lamp as claimed in claim 37, wherein the protective layer further comprises a third opening, wherein the third opening comprises the recognizing mark.

39. The LED tube lamp as claimed in claim 37, wherein the power supply module comprises a circuit board disposed in one of the two non-illuminating regions, and the connecting region is electrically coupled to the circuit board via the two soldering pads.

40. The LED tube lamp as claimed in claim 39, wherein the circuit board is parallel to a longitudinal direction of the lamp tube.

41. The LED tube lamp as claimed in claim 37, wherein the light strip further comprises a first wiring layer, 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.

42. The LED tube lamp as claimed in claim 41, 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.

43. The LED tube lamp as claimed in claim 42, wherein the light strip further comprises a dielectric layer disposed between the first wiring layer and the second wiring layer.

44. The LED tube lamp as claimed in claim 41, wherein the LED tube lamp further comprises a diffusion film coated on a surface of the lamp tube.

45. The LED tube lamp as claimed in claim 44, wherein the diffusion film is coated on an inner surface of the lamp tube.

46. The LED tube lamp as claimed in claim 37, wherein the power supply module comprises:

a rectifying circuit, having a first input terminal electrically connected to a pin disposed on one of the two end caps and a second input terminal electrically connected to a pin disposed on the other one of the end caps,

wherein the rectifying circuit produces a rectified signal between a first rectifying output terminal and a second rectifying output terminal.

47. The LED tube lamp as claimed in claim 46, wherein the rectifying circuit comprises:

a first rectifying diode, having an anode connected to the second rectifying output terminal and a cathode connected to the second input terminal;

a second rectifying diode, having an anode connected to the second rectifying output terminal and a cathode connected to the first input terminal;

a third rectifying diode, having an anode connected to the second input terminal and a cathode connected to the first rectifying output terminal; and

a fourth rectifying diode, having an anode connected to the first input terminal and a cathode connected to the first rectifying output terminal.

48. The LED tube lamp as claimed in claim 47, wherein the power supply module further comprises:

a first filtering unit, electrically connected to the first and the second rectifying output terminals to receive the rectified signal, and configured to produce a filtered signal.

49. The LED tube lamp as claimed in claim 48 wherein the first filtering unit comprises:

a first capacitor, having an end electrically connected to the first rectifying output terminal and the other end electrically connected to the second rectifying output terminal.

50. The LED tube lamp as claimed in claim 49, wherein the power supply module further comprises:

a second filtering unit, electrically connected between the first input terminal and the first pin coupled to the first input terminal.

51. The LED tube lamp as claimed in claim 50, wherein the second filtering unit comprises:

an inductor, having an end connected to the first pin coupled to the first input terminal and the other end connected to the first input terminal.

52. The LED tube lamp as claimed in claim 50, wherein the power supply module further comprises:

a third filtering unit, electrically connected between one of the two pins and one of the rectifying diodes of the rectifying circuit.

53. The LED tube lamp as claimed in claim 52, wherein the third filtering unit comprises:

an EMI-reducing capacitor, connected between the pin coupled to the first input terminal and the anode of the third rectifying diode.

54. The LED tube lamp as claimed in claim 49, wherein the power supply module further comprises:

a driving circuit, electrically connected to the first filtering unit to receive the filtered signal and configured to perform power conversion for converting the filtered signal into a driving signal,

wherein the LED light sources receive the driving signal from output terminals of the driving circuit for emitting light.

55. The LED tube lamp as claimed in claim 54, wherein the driving circuit comprises:

a controller;

a switch, having a first terminal electrically connected to the end of the first capacitor, a second terminal, and a control terminal coupled to the controller, wherein the switch is turned on or off in response to a signal received from the controller;

a diode, having an anode electrically connected to the other end of the first capacitor and a cathode electrically connected to the second terminal of the switch;

an inductor, having an end electrically connected to the second terminal of the switch, and another end electrically connected to the LED light sources via one of the driving output terminals; and

a second capacitor, having an end electrically connected to the another end of the inductor and the other end electrically connected to the LED light sources via the other one of the driving output terminals.

56. The LED tube lamp as claimed in claim 54, wherein the power supply module further comprises:

an installation detection module, configured to detect a signal passing through the first and the second installation detection terminals and determine whether to cut off the driving signal based on a detected result.

57. The LED tube lamp as claimed in claim 56, wherein the installation detection module comprises:

a switch circuit, having a first terminal electrically connected to the second rectifying output terminal via a first installation detection terminal, a second terminal electrically connected to the other end of the first capacitor via a second installation detection terminal, and a control terminal for receiving a control signal,

wherein the switch circuit controls the state between conducting or cut off between the first and the second installation detection terminals according to the control signal.

58. The LED tube lamp as claimed in claim 57, wherein the installation detection module comprises:

a detection result keeping circuit, electrically connected to the control terminal of the switch circuit and configured to output and keep a high logic level signal when the LED tube lamp is operated in an operating stage.

59. The LED tube lamp as claimed in claim 58, wherein the installation detection module comprises:

a detection pulse generating module, electrically connected to the control terminal of the switch circuit and configured to generate a pulse signal as the control signal when the LED tube lamp is operated in a detection stage.

60. The LED tube lamp as claimed in claim 59, wherein the installation detection module further comprises:

a detection determining circuit, electrically connected to the control terminal of the switch circuit and configured to perform detection based on the pulse signal and generate a detection result for indicating whether to enter an operating stage from the detection stage.

61. The LED tube lamp as claimed in claim 37, further comprising a first pin, a second pin and a third pin, two of the three pins coupled to one of the end caps and the other one of the three pins coupled to the other one of the end caps, wherein the power supply module comprises:

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

a second rectifying circuit connected to the third pin and an output terminal of the first rectifying circuit.

62. The LED tube lamp as claimed in claim 61, wherein the power supply module further comprises a driving circuit coupled to the first and second rectifying circuits for driving the LED light sources, further wherein the LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, the first power supply arrangement being that the external driving signal is transmitted through the first and second pins, and the second power supply arrangement being that the external driving signal is transmitted through one of the first and second pins and through the third pin.

63. The LED tube lamp as claimed in claim 62, 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.

64. The LED tube lamp as claimed in claim 63, 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.

65. The LED tube lamp as claimed in claim 64, the power supply module further comprises 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.

66. The LED tube lamp as claimed in claim 65, wherein when the external driving signal is a low frequency signal having a frequency between 0 and 60 Hz from an AC powerline.