LED tube lamp including light strip including a pad and an opening formed on the pad

• US 9,903,577 B2
• Filed: 03/09/2017
• Issued: 02/27/2018
• Est. Priority Date: 03/10/2015
• Status: Active Grant

• Current Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Original Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Inventors: Xiong, Aiming, Hu, Hechen, Ye, Qifeng
• Primary Examiner(s): TRAN, ANH Q
• Application Number:
  US15/454,988
• Publication Number:
  US 20170196064A1
• Time in Patent Office: 355 Days
• 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 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21V 3/061 the material being glass
• 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 45/40 Details of LED load 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 45/59 for reducing or suppressing flicker or glow effects

Abstract

An LED tube lamp is disclosed. The LED tube lamp includes a filtering circuit, an LED lighting module, and an anti-flickering circuit. The filtering circuit is configured to filter a rectified external driving signal. The LED lighting module has an LED module, and is configured to generate a driving signal, and the LED module is configured to receive the driving signal to emit light. The LED module is formed on an LED light strip, which includes at least a first pad connected to the filtering circuit, and at least an opening formed on the first pad. The anti-flickering circuit is configured to reduce flickering effect in light emission of the LED module. The LED tube lamp further includes a conduction-delaying circuit; a first rectifying circuit and at least a fuse; or first and second filament-simulating circuits respectively coupled to two opposite ends of the lamp tube.

Claims

1. An LED tube lamp, comprising:

a filtering circuit configured to receive a rectified external driving signal and filter the rectified external driving signal to generate a filtered signal;

an LED lighting module coupled to the filtering circuit, the LED lighting module having an LED module, wherein the LED lighting module is configured to generate a driving signal and the LED module is configured to receive the driving signal to emit light, the LED module is formed on an LED light strip, and the LED light strip includes at least a first pad connected to the filtering circuit and at least an opening formed on the first pad;

an anti-flickering circuit, coupled to the filtering circuit and the LED lighting module, wherein the anti-flickering circuit is configured to reduce a flickering effect in light emission of the LED module by allowing flow of a current higher than a predetermined current to pass through the anti-flickering circuit; and

a conduction-delaying circuit coupled to the filtering circuit, wherein the conduction-delaying circuit is configured such that when the external driving signal is initially input to the LED tube lamp, the conduction-delaying circuit will initially be in an open-circuit state preventing the LED tube lamp from emitting light, until the conduction-delaying circuit enters into a conduction state, which conduction state allows a current input to the LED tube lamp to flow through the LED module and thereby allows the LED tube lamp to emit light.

2. The LED tube lamp of claim 1, further comprising:

a first pin and a second pin for receiving an external driving signal;

a first fuse coupled to the first pin;

a second fuse coupled to the second pin; and

a first rectifying circuit coupled to the first and second pins for rectifying the external driving signal to generate the rectified external driving signal.

3. The LED tube lamp of claim 1, wherein the conduction-delaying circuit comprises a first electronic switch, wherein the first electronic switch is configured such that when the external driving signal is initially input to the LED tube lamp, the first electronic switch will be in an open-circuit state, and then the first electronic switch will enter into a conducting state when the voltage across the first electronic switch exceeds the first electronic switch'"'"'s trigger voltage value, thereby causing the conduction-delaying circuit to enter into the conduction state.

4. The LED tube lamp of claim 1, wherein the anti-flickering circuit comprises at least one resistor.

5. The LED tube lamp according to claim 2, wherein the conduction-delaying circuit is coupled between the filtering circuit and the first rectifying circuit.

6. The LED tube lamp according to claim 1, wherein the conduction-delaying circuit comprises a first electronic switch, a second electronic switch, and a first capacitor;

and the first electronic switch has a first terminal coupled to the second electronic switch, and has a second terminal coupled to the first capacitor;

wherein the conduction-delaying circuit is configured such that when the external driving signal is initially input to the LED tube lamp, the second electronic switch will be in an open-circuit state, and the first capacitor will be charged so as to cause the first electronic switch to enter into a conducting state to an extent that in turn triggers the second electronic switch to enter into a conducting state, thereby causing the conduction-delaying circuit to enter into the conduction state.

7. The LED tube lamp according to claim 6, wherein the first electronic switch comprises a symmetrical trigger diode, and the second electronic switch comprises a bidirectional triode thyristor.

8. The LED tube lamp according to claim 1, wherein the conduction-delaying circuit comprises a ballast compatible circuit for the LED tube lamp to be compatible with a ballast used to supply the LED tube lamp.

9. An LED tube lamp, comprising:

a tube provided with a first pin and a second pin for receiving an external driving signal at one end of the tube;

a first rectifying circuit, coupled to the first and second pins for rectifying the external driving signal to generate a rectified signal;

at least one fuse coupled to the first rectifying circuit;

a filtering circuit coupled to the first rectifying circuit for filtering the rectified signal to generate a filtered signal;

an LED lighting module coupled to the filtering circuit, the LED lighting module having an LED module, wherein the LED lighting module is configured to generate a driving signal and the LED module is configured to receive the driving signal to emit light, and wherein the LED module is formed on an LED light strip, and wherein the LED light strip includes at least a first pad connected to the filtering circuit and at least an opening formed on the first pad; and

an anti-flickering circuit, coupled to the filtering circuit and the LED lighting module, wherein the anti-flickering circuit is configured to reduce flickering effect in light emission of the LED module by allowing flow of a current higher than a predetermined current to pass through the anti-flickering circuit.

10. The LED tube lamp according to claim 9, wherein the at least a fuse comprises two fuses respectively coupled to the first and second pins.

11. The LED tube lamp according to claim 9, wherein the LED light strip includes at least a through hole adjacent to the first pad.

12. The LED tube lamp according to claim 9, wherein the first and second pins are respectively disposed at two opposite end caps of the LED tube lamp.

13. The LED tube lamp of claim 9, further comprising a second rectifying circuit coupled to a third pin and a fourth pin for rectifying the external driving signal concurrently with the first rectifying circuit.

14. The LED tube lamp of claim 9, further comprising

a current-limiting element for receiving the external driving signal input at the end of the tube, the current-limiting element coupled to one or more of the two pins, and coupled to the first rectifying circuit;

and

a ballast detection circuit coupled to or in the first rectifying circuit, and coupled to the current-limiting element, for the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast detection circuit has a first terminal and a second terminal and is configured to determine whether the external driving signal comes from a ballast, according to a state of a property of the external driving signal, or according to a state of a property of a detection signal transmitted through the first terminal and the second terminal upon the external driving signal being input to the LED tube lamp;

wherein the at least one fuse is coupled to the current-limiting element and the ballast detection circuit.

21. The LED tube lamp of claim 9, wherein the first rectifying circuit is coupled between the first and second pins and the filtering circuit;

the first rectifying circuit comprises four diodes, a first common node between two of the four diodes connects an anode and a cathode respectively of the two of the four diodes, and a second common node between the other two of the four diodes connects an anode and a cathode respectively of the other two of the four diodes; and

the LED tube lamp further comprises a capacitor coupled between the first and second common nodes.

22. The LED tube lamp of claim 21, wherein the capacitor is configured for filtering an AC signal received through the first and second pins, or for reducing EMI effects.

23. The LED tube lamp of claim 21, wherein the filtering circuit comprises a pi filter circuit coupled between the first rectifying circuit and the LED lighting module;

the pi filter circuit includes a first capacitor, an inductor, and a second capacitor;

the first capacitor is coupled between a common cathode of first and second ones of the four diodes and a common anode of third and fourth ones of the four diodes; and

the inductor and the second capacitor are connected in series between the common cathode and the common anode.

24. The LED tube lamp of claim 9, wherein the anti-flickering circuit comprises a resistor coupled to the LED module.

25. The LED tube lamp of claim 9, wherein the filtering circuit comprises a capacitor coupled to the LED module.

26. The LED tube lamp of claim 9, further comprising

a current-limiting element for receiving the external driving signal input at the end of the tube, the current-limiting element coupled between one or more of the two pins and the first rectifying circuit, wherein the current-limiting element comprises a resistor, a capacitor, an inductor, or any combination thereof.

15. An LED tube lamp, comprising:

a tube provided with at least one pin for receiving an external driving signal from one end of the tube, and provided with at least one pin for receiving an external driving signal from another end of the tube;

a first filament-simulating circuit coupled to the at least one pin at the one end of the tube, and a second filament-simulating circuit coupled to the at least one pin at the other end of the tube;

a filtering circuit configured to filter a rectified version of the received external driving signal to generate a filtered signal;

an LED lighting module coupled to the filtering circuit, the LED lighting module having an LED module, wherein the LED lighting module is configured to generate a driving signal and the LED module is configured to receive the driving signal to emit light, wherein the LED module is formed on an LED light strip, and wherein the LED light strip includes at least a first pad connected to the filtering circuit and at least an opening formed on the first pad; and

an anti-flickering circuit, coupled between the filtering circuit and the LED lighting module, wherein the anti-flickering circuit is configured to reduce flickering effect in light emission of the LED module by allowing flow of a current higher than a predetermined current to pass through the anti-flickering circuit.

16. The LED tube lamp of claim 15, further comprising:

a first rectifying circuit coupled to the at least one pin at the one end of the tube for rectifying the external driving signal to generate the rectified version of the received external driving signal.

17. The LED tube lamp of claim 15, wherein the one end of the tube is provided with a first pin and a second pin, and the other end of the tube is provided with a third pin and a fourth pin.

18. The LED tube lamp of claim 17, wherein the first filament-simulating circuit comprises a resistor or capacitor connected between the first and second pins, and the second filament-simulating circuit comprises a resistor or capacitor connected between the third and fourth pins.

19. The LED tube lamp of claim 17, wherein the first filament-simulating circuit comprises a resistor and a capacitor connected in parallel with each other between the first and second pins, and the second filament-simulating circuit comprises a resistor and a capacitor connected in parallel with each other between the third and fourth pins.

20. The LED tube lamp of claim 15, wherein the LED light strip includes at least a through hole adjacent to the first pad.