LED tube lamp

• US 9,890,909 B2
• Filed: 10/20/2016
• Issued: 02/13/2018
• 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: Liu, Xintong, Jiang, Tao, Xiong, Aiming, Li, Liqin
• Primary Examiner(s): TRAN, ANH Q
• Application Number:
  US15/298,272
• Publication Number:
  US 20170038013A1
• Time in Patent Office: 481 Days
• Field of Search: None
• 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 9/278 Arrangement or mounting of circuit elements integrated in the light source
• 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 25/04 breaking the electric circuit
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• 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 45/3578 Emulating the electrical or functional characteristics of discharge lamps
• CPC Class Codes: H05B 45/36 Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• CPC Class Codes: H05B 45/375 using buck topology
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: H05B 45/50 responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: H05B 45/59 for reducing or suppressing flicker or glow effects
• 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 is provided herein, which implements the safety function for protecting the user from electric shock since it conducts only when both ends thereof have been correctly installed into a lamp socket. The LED tube lamp includes an installation detection module configured in the LED tube lamp to detect an installation state between the LED tube lamp and the lamp socket. The installation detection module includes: a detection pulse generating module, configured to generate a first pulse signal; a detection result latching circuit, configured to receive and output the first pulse signal; a switch circuit, configured to receive the first pulse signal from the detection result latching circuit, and configured to maintain a conductive state of the switch circuit during the first pulse to cause a power loop of the LED tube lamp to be conductive; and a detection determining circuit, configured to detect a first sampling signal on the power loop so as to determine the installation state between the LED tube lamp and the lamp socket.

Claims

1. A light-emitting diode (LED) tube lamp, comprising:

a tube comprising two end regions, two transition regions, and a main body region, the two end regions are at two opposite ends of the main body region, each of the two transition regions are respectively between a respective end region and the main body region;

two end caps, each having at least one pin, and each coupled to a respective end of the tube;

a power supply disposed in one of the end caps, or disposed in a separated manner in the two end caps; and

an LED light strip disposed inside the tube and having a plurality of LED light sources mounted thereon, the LED light sources being electrically connected to the power supply by the LED light strip;

wherein the LED light strip comprises a bendable circuit sheet or a flexible circuit board passing through at least a first of the two transition regions of the tube and disposed with a soldering pad at an end of the bendable circuit sheet or flexible circuit board, and the power supply comprises a printed circuit board disposed with a soldering pad corresponding to the soldering pad of the bendable circuit sheet or flexible circuit board, and the soldering pad of the bendable circuit sheet or flexible circuit board is electrically connected to the soldering pad of the printed circuit board of the power supply to provide electrical connection between the power supply and the LED light sources.

2. The LED tube lamp according to claim 1, wherein the soldering pad of the bendable circuit sheet or flexible circuit board and the soldering pad of the printed circuit board of the power supply face substantially the same direction.

3. The LED tube lamp according to claim 1, wherein the soldering pad of the bendable circuit sheet or flexible circuit board and the soldering pad of the printed circuit board of the power supply face opposite directions.

4. The LED tube lamp according to claim 1, wherein the bendable circuit sheet or flexible circuit board and the printed circuit board are stacked on each other.

5. A light-emitting diode (LED) tube lamp, comprising:

a tube;

two end caps, each having at least one pin, and each coupled to a respective end of the tube;

an LED light strip disposed inside the tube and mounted with a plurality of LED light sources; and

a power supply electrically connected to the LED light strip without the use of bonding wires;

wherein the LED light strip comprises at least a first soldering pad at a first end of the LED light strip, and the power supply comprises at least a second soldering pad corresponding to the first soldering pad of the LED light strip.

6. The LED tube lamp according to claim 5, wherein the LED light strip comprises a bendable circuit sheet or a flexible circuit board.

7. The LED tube lamp according to claim 6, wherein the bendable circuit sheet or flexible circuit board further comprises an ink layer.

8. The LED tube lamp according to claim 6, wherein a solder connecting the first soldering pad of the bendable circuit sheet or flexible circuit board and the second soldering pad of the power supply forms a rivet-like structure.

9. The LED tube lamp according to claim 6, wherein a solder between the first soldering pad of the bendable circuit sheet or flexible circuit board and the second soldering pad of the power supply forms a C-shaped structure.

10. The LED tube lamp according to claim 6, wherein the first soldering pad of the bendable circuit sheet or flexible circuit board is on the edge of the bendable circuit sheet.

11. The LED tube lamp according to claim 6, wherein at least two soldering pads are disposed on each of two ends of the LED light strip.

12. The LED tube lamp according to claim 6, wherein more than one soldering pad is included on the bendable circuit sheet or flexible circuit board.

13. The LED tube lamp according to claim 12, wherein two soldering pads are disposed on the bendable circuit sheet or flexible circuit board, and an electrically insulating hole is formed and disposed between the two soldering pads of the bendable circuit sheet or flexible circuit board to prevent a short circuit between the two soldering pads when soldering.

14. The LED tube lamp according to claim 13, wherein an alignment hole is configured and disposed behind the electrically insulating hole to allow a soldering machine to automatically locate the soldering pads of the bendable circuit sheet or flexible circuit board.

15. The LED tube lamp according to claim 12, wherein at least one of the soldering pads is formed with a through-hole.

16. The LED tube lamp according to claim 15, wherein the at least one soldering pad of the bendable circuit sheet or flexible circuit board is formed with a solder ball above the through-hole after soldering is completed, and a diameter of the solder ball is larger than the diameter of the through-hole.

17. The LED tube lamp according to claim 12, wherein at least one of the soldering pads of the LED light strip is formed with a notch at an edge of the bendable circuit sheet or flexible circuit board.

18. The LED tube lamp according to claim 17, wherein the at least one soldering pad of the bendable circuit sheet or flexible circuit board is formed with a solder ball above the notch after soldering is completed, and a diameter of the solder ball is larger than a diameter of the notch.

19. The LED tube lamp according to claim 6, wherein at least three soldering pads are disposed on the bendable circuit sheet or flexible circuit board and arranged in one row or two rows.

20. The LED tube lamp according to claim 5, wherein the first soldering pad of the LED light strip and the second soldering pad of the power supply are bonded directly by soldering.

21. The LED tube lamp according to claim 5, wherein the first soldering pad of the LED light strip and the second soldering pad of the power supply face substantially the same direction.

22. The LED tube lamp according to claim 5, wherein the first soldering pad of the LED light strip and the second soldering pad of the power supply face opposite directions.

23. The LED tube lamp according to claim 5, wherein the LED light strip and the power supply are stacked with respect to each other.

24. The LED tube lamp according to claim 5, wherein a filament-simulating circuit is included in one of the end caps.

25. The LED tube lamp according to claim 24, wherein the filament-simulating circuit comprises a capacitor and a resistor connected in parallel.

26. The LED tube lamp according to claim 5, wherein the LED light strip is formed of a bendable circuit sheet that can be curled.

27. The LED tube lamp according to claim 5, wherein the power supply is disposed in one of the end caps or is disposed in a separated manner in the two end caps.

28. The LED tube lamp according to claim 5, wherein the power supply is located on the light strip.

29. A light-emitting diode (LED) tube lamp, comprising:

a tube having at least one transition region;

two end caps, each having at least one pin, and each coupled to a respective end of the tube;

a power supply having one or two printed circuit board(s) disposed in one or both of the end cap(s); and

an LED light strip disposed inside the tube and comprising a plurality of LED light sources mounted thereon, the LED light sources being electrically connected to the power supply by the LED light strip;

wherein the LED light strip comprises a bendable circuit sheet or a flexible circuit board with a longitudinally projected length longer than a length of the tube to form a freely extending end portion at one end of the bendable circuit sheet or flexible circuit board passing across the transition region of the tube, the end of the bendable circuit sheet or flexible circuit board comprises at least one first soldering pad, the at least one first soldering pad is formed with either a through-hole or a notch, and the printed circuit board of the power supply is disposed with a second soldering pad corresponding to the first soldering pad of the bendable circuit sheet or flexible circuit board.

30. The LED tube lamp according to claim 29, wherein a solder between the first soldering pad of the bendable circuit sheet or flexible circuit board and the second soldering pad of the printed circuit board of the power supply forms a rivet-like structure.

31. The LED tube lamp according to claim 29, wherein a solder between the first soldering pad of the bendable circuit sheet or flexible circuit board and the second soldering pad of the power supply forms a C-shaped structure.

32. The LED tube lamp according to claim 29, wherein the first soldering pad of the bendable circuit sheet or flexible circuit board is on the edge of the bendable circuit sheet.

33. The LED tube lamp according to claim 29, wherein the bendable circuit sheet or flexible circuit board and the printed circuit board are stacked on each other.