LED tube lamp

• US 10,624,160 B2
• Filed: 05/23/2019
• Issued: 04/14/2020
• 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: Jiang, Tao, Ye, Qifeng, Zhang, Yueqiang
• Primary Examiner(s): Tan, Vibol
• Application Number:
  US16/420,506
• Publication Number:
  US 20190281673A1
• Time in Patent Office: 327 Days
• 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 9/278 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 19/003 Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 23/023 Power supplies in a casing F21V23/003 takes precedence
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/32 Pulse-control circuits
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/375 using buck topology
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: H05B 45/392 wherein the LEDs are placed as freewheeling diodes at the secondary side of an isolation transformer
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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.

Claims

1. An LED tube lamp, comprising:

a glass tube;

an LED light strip disposed inside the glass tube and attached to an inner circumferential surface of the glass tube;

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

a power supply module electrically connecting the plurality of LED light sources and comprising a plurality of electronic components;

a heat-dissipating element thermally contacting with the power supply module; and

a first end cap and a second end cap respectively attached at two ends of the glass 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 glass tube and connected to the glass 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 glass tube,

wherein 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.

2. The LED tube lamp as claimed in claim 1, wherein the power supply module further comprises a circuit board and the plurality of electronic components are mounted on the circuit board.

3. The LED tube lamp as claimed in claim 2, wherein the circuit board is substantially 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 module 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 power supply module and the end wall of the first end cap, and wherein a portion of the heat-dissipating element is contacted with the power supply module 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, a second pin and a third pin, two of the three pins coupled to the first end cap and the other one of the three pins coupled to the second end cap, wherein the power supply module comprises:

a first rectifying circuit connected to the first pin;

a second rectifying circuit connected to the second and third pins, an output terminal of the first rectifying circuit connected to an output terminal of the second rectifying circuit; and

a driving circuit coupled to the first and second rectifying circuits and the LED light sources,

wherein the LED tube lamp is configured to receive an 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 transmitted through the first and second pins, and a 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.

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

9. The LED tube lamp as claimed in claim 8, wherein the first 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 first rectifying circuit, and the third common node is coupled to the first pin, and further wherein a common anode of the second and the fourth diodes of the second rectifying circuit is coupled to an anode of one of the fifth and sixth diodes of the first rectifying circuit, and a common cathode of the first and third diodes of the second rectifying circuit is coupled to a cathode of the other one of the fifth and sixth diodes of the first rectifying circuit.

10. The LED tube lamp as claimed in claim 9, wherein 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 a rectified signal from one of first and second rectifying circuits, or to prevent the LED light sources from being driven by the rectified signal.

11. The LED tube lamp as claimed in claim 10, wherein the external driving signal is a low frequency signal having a frequency between 0 and 60 Hz from an AC powerline.

12. The LED tube lamp as claimed in claim 1, 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.

13. The LED tube lamp as claimed in claim 12, 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.

14. The LED tube lamp as claimed in claim 13, 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.

15. The LED tube lamp as claimed in claim 14, 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.

16. The LED tube lamp as claimed in claim 15, 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.

17. The LED tube lamp as claimed in claim 16, 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.

18. The LED tube lamp as claimed in claim 16, 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.

19. The LED tube lamp as claimed in claim 18, 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.

20. The LED tube lamp as claimed in claim 15, 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 driving output terminals of the driving circuit for emitting light.

21. The LED tube lamp as claimed in claim 20, wherein the driving circuit comprises:

a controller;

a switch, having a first terminal electrically connected to an 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.

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

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

23. The LED tube lamp as claimed in claim 22, wherein the installation detection module comprises:

a switch circuit, having a first terminal electrically connected to the second rectifying output terminal via the first installation detection terminal, the second terminal electrically connected to the other end of the first capacitor via the 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.

24. The LED tube lamp as claimed in claim 23, 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.

25. The LED tube lamp as claimed in claim 23, 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.

26. The LED tube lamp as claimed in claim 25, 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.

27. An LED tube lamp, comprising:

a glass tube;

an LED light strip disposed inside the glass tube and attached to an inner circumferential surface of the glass tube;

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

a power supply module electrically connecting the plurality of LED light sources and comprising a plurality of electronic components;

a heat-dissipating element thermally contacting with the power supply module; and

a first end cap and a second end cap respectively attached at two ends of the glass tube, each of the first and the second end caps comprising a lateral wall and an end wall having an opening, the lateral wall substantially coaxial with the glass tube and connected to the glass 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 glass tube,

wherein the heat-dissipating element extends between the power supply module and the end wall of the first end cap, and further wherein a portion of the heat-dissipating element is contacted with the power supply module and another portion of the heat-dissipating element is disposed in the opening of the end wall of the first end cap.

28. The LED tube lamp as claimed in claim 27, wherein the power supply module further comprises a circuit board and the plurality of electronic components and the heat-dissipating element are mounted on the circuit board.

29. The LED tube lamp as claimed in claim 27, 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 module electrically connects the first pin and the second pin.

30. The LED tube lamp as claimed in claim 27, further comprising a first pin, a second pin and a third pin, two of the three pins coupled to the first end cap and the other one of the three pins coupled to the second end cap, wherein the power supply module comprises:

a first rectifying circuit connected to the first pin;

a second rectifying circuit connected to the second and third pins, an output terminal of the first rectifying circuit connected to an output terminal of the second rectifying circuit; and

a driving circuit coupled to the first and second rectifying circuits and the LED light sources,

wherein the LED tube lamp is configured to receive an 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 transmitted through the first and second pins, and a 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 second rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode, the second pin is connected to a first common node connecting an anode of the first diode and a cathode of the second diode, and the third 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 first 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 first rectifying circuit, and the third common node is coupled to the first pin, and further wherein a common anode of the second and the fourth diodes of the second rectifying circuit is coupled to an anode of one of the fifth and sixth diodes of the first rectifying circuit, and a common cathode of the first and third diodes of the second rectifying circuit is coupled to a cathode of the other one of the fifth and sixth diodes of the first rectifying circuit.

33. The LED tube lamp as claimed in claim 32, wherein 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 a rectified signal from one of first and second rectifying circuits, or to prevent the LED light sources from being driven by the rectified signal.

34. The LED tube lamp as claimed in claim 27, 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.

35. The LED tube lamp as claimed in claim 34, 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.

36. The LED tube lamp as claimed in claim 35, 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.

37. The LED tube lamp as claimed in claim 36, 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.

38. The LED tube lamp as claimed in claim 37, 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.

39. The LED tube lamp as claimed in claim 38, 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.

40. The LED tube lamp as claimed in claim 38, 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.

41. The LED tube lamp as claimed in claim 40, 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.

42. The LED tube lamp as claimed in claim 37, 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 driving output terminals of the driving circuit for emitting light.

43. The LED tube lamp as claimed in claim 42, wherein the driving circuit comprises:

a controller;

a switch, having a first terminal electrically connected to an 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.

44. The LED tube lamp as claimed in claim 42, wherein the power supply module further comprises:

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

45. The LED tube lamp as claimed in claim 44, wherein the installation detection module comprises:

a switch circuit, having a first terminal electrically connected to the second rectifying output terminal via the first installation detection terminal, the second terminal electrically connected to the other end of the first capacitor via the 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.

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

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

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

49. An LED tube lamp, comprising:

a glass tube;

an LED light strip disposed inside the glass tube and attached to an inner circumferential surface of the glass tube;

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

a first end cap and a second end cap respectively attached at two ends of the glass tube, each of the first end cap and the second end cap comprising a lateral wall and an end wall having an opening, the lateral wall substantially coaxial with the glass tube and connected to the glass 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 glass tube;

a power supply module electrically connecting the plurality of LED light sources and comprising a first electronic component, a second electronic component, wherein the first electronic component generates more heat than the second electronic component; and

a heat-dissipating element thermally contacting with the power supply module, the first electronic component, the second electronic component and the heat-dissipating element are disposed at an end of the glass tube;

wherein the first electronic component is disposed closer to the opening on the end well of the first end cap than the second electronic component is.

50. The LED tube lamp as claimed in claim 49, wherein the power supply module further comprises a circuit board, wherein the first electronic component, the second electronic component and the heat-dissipating element are mounted on the circuit board.

51. The LED tube lamp as claimed in claim 50, wherein the first electronic component is one of an inductor, a transistor, a resistor and an integrated circuit.

52. The LED tube lamp as claimed in claim 50, wherein the heat-dissipating element extends between the circuit board and the end wall of the first end cap, a portion of the heat-dissipating element is mounted on the circuit board and another portion of the heat-dissipating element is in the opening of the end wall of the first end cap.

53. The LED tube lamp as claimed in claim 52, 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 module is coupled to the first pin and the second pin.

54. The LED tube lamp as claimed in claim 49, further comprising a first pin, a second pin and a third pin, two of the three pins coupled to the first end cap and the other one of the three pins coupled to the second end cap, wherein the power supply module comprises:

a first rectifying circuit connected to the first pin;

a second rectifying circuit connected to the second and third pins, an output terminal of the first rectifying circuit connected to an output terminal of the second rectifying circuit; and

a driving circuit coupled to the first and second rectifying circuits and the LED light sources,

wherein the LED tube lamp is configured to receive an 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 transmitted through the first and second pins, and a 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.

55. The LED tube lamp as claimed in claim 54, wherein the second rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode, the second pin is connected to a first common node connecting an anode of the first diode and a cathode of the second diode, and the third pin is connected to a second common node connecting an anode of the third diode and a cathode of the fourth diode.

56. The LED tube lamp as claimed in claim 55, wherein the first 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 first rectifying circuit, and the third common node is coupled to the first pin, and further wherein a common anode of the second and the fourth diodes of the second rectifying circuit is coupled to an anode of one of the fifth and sixth diodes of the first rectifying circuit, and a common cathode of the first and third diodes of the second rectifying circuit is coupled to a cathode of the other one of the fifth and sixth diodes of the first rectifying circuit.

57. The LED tube lamp as claimed in claim 56, wherein 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 a rectified signal from one of first and second rectifying circuits, or to prevent the LED light sources from being driven by the rectified signal.

58. The LED tube lamp as claimed in claim 57, wherein the external driving signal is a low frequency signal having a frequency between 0 and 60 Hz from an AC powerline.

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

60. The LED tube lamp as claimed in claim 59, 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.

61. The LED tube lamp as claimed in claim 60, 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.

62. The LED tube lamp as claimed in claim 61, 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.

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

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

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

66. The LED tube lamp as claimed in claim 65, 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.

67. The LED tube lamp as claimed in claim 62, 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 driving output terminals of the driving circuit for emitting light.

68. The LED tube lamp as claimed in claim 67, wherein the driving circuit comprises:

a controller;

a switch, having a first terminal electrically connected to an 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.

69. The LED tube lamp as claimed in claim 67, wherein the power supply module further comprises:

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

70. The LED tube lamp as claimed in claim 69, wherein the installation detection module comprises:

a switch circuit, having a first terminal electrically connected to the second rectifying output terminal via the first installation detection terminal, the second terminal electrically connected to the other end of the first capacitor via the 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.

71. The LED tube lamp as claimed in claim 70, 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.

72. The LED tube lamp as claimed in claim 70, 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.

73. The LED tube lamp as claimed in claim 72, 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.