Light emitting diode (LED) tube lamp

• US 9,980,329 B2
• Filed: 03/09/2016
• Issued: 05/22/2018
• 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: Hu, Hechen, Xiong, Aiming
• Primary Examiner(s): Richardson, Jany
• Application Number:
  US15/064,621
• Publication Number:
  US 20160270163A1
• Time in Patent Office: 804 Days
• Field of Search: None
• CPC Class Codes: H05B 45/345 Current stabilisation; Maintaining constant current
• CPC Class Codes: H05B 45/3578 Emulating the electrical or functional characteristics of discharge lamps
• 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 47/24 Circuit arrangements for protecting against overvoltage
• 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 includes a lamp tube having two pins to receive an external driving signal; a rectifying circuit coupled to the two pins to rectify the external driving signal; a filtering circuit coupled to the rectifying circuit to filter rectified signal; and an LED lighting module coupled to the filtering circuit to receive the filtered signal to emit light. The LED lighting module further has a driving circuit and an LED module, the driving circuit includes a controller and a conversion circuit coupled to the filtering circuit to receive and convert filtered signal into driving signal to drive the LED module. The LED tub lamp further includes an over voltage protection circuit coupled to the filtering circuit for detecting the filtered signal, the over voltage protection circuit clamps the filtered signal when determining the filtered signal is higher than a defined over voltage protection value.

Claims

1. An LED tube lamp, comprising:

a lamp tube comprising a light transmissive portion and a reinforcing portion;

a light strip disposed inside the lamp tube and on the reinforcing portion;

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

a power supply module comprising a plurality of electronic components configured to drive the LED light sources,

wherein, at least one of the plurality of electronic components is disposed on the reinforcing portion,

wherein, a rectifying circuit, a filtering circuit and an over voltage protection circuit are formed by interconnecting the plurality of electronic components,

wherein the filtering circuit is coupled to the rectifying circuit and is configured to receive a rectified signal from the rectifying circuit, and

wherein the over voltage protection circuit is coupled to the filtering circuit for detecting a filtered signal, and the over voltage protection circuit is configured to clamp the filtered signal when determining that the filtered signal is higher than a predefined over voltage protection value.

2. The LED tube lamp of claim 1, wherein the over voltage protection circuit comprises a voltage stabilization circuit.

3. The LED tube lamp of claim 2, wherein the voltage stabilization circuit comprises a zener diode.

4. The LED tube lamp of claim 1, wherein the over voltage protection circuit is configured such that, in a protection state, the over voltage protection circuit limits or restrains a level of the filtered signal.

5. The LED tube lamp of claim 1, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal;

the over voltage protection circuit includes a voltage clamping circuit comprising a thyristor, wherein the thyristor has a first terminal coupled to the first filtering output terminal and a second terminal coupled to the second filtering output terminal; and

the thyristor is configured such that when an overvoltage condition of the plurality of LED light sources occurs the thyristor enters a conducting state, causing the voltage between the first filtering output terminal and the second filtering output terminal to be restrained or clamped down on.

6. The LED tube lamp of claim 5, wherein the over voltage protection circuit includes a capacitor, and the voltage clamping circuit further includes a symmetrical trigger diode;

the thyristor has a control terminal connected to a first terminal of the symmetrical trigger diode;

the symmetrical trigger diode has a second terminal connected to an end of the capacitor, which has another end connected to the second filtering output terminal; and

when the overvoltage condition of the plurality of LED light sources occurs, the thyristor enters the conducting state by an electric potential at the second terminal of the symmetrical trigger diode.

7. The LED tube lamp of claim 6, wherein the over voltage protection circuit further includes a voltage division circuit coupled to the symmetrical trigger diode and the filtering circuit;

the voltage division circuit is also coupled to detect a voltage of the plurality of LED light sources; and

when an overvoltage condition of the plurality of LED light sources occurs, the voltage division circuit causes the thyristor to enter the conducting state by an electric potential at the second terminal of the symmetrical trigger diode.

8. The LED tube lamp of claim 7, wherein the voltage division circuit comprises a first electronic switch, a second electronic switch, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein the third resistor has an end connected to the second terminal of the symmetrical trigger diode and another end connected to the second filtering output terminal;

the first resistor has an end connected to the second terminal of the symmetrical trigger diode and another end connected to the first electronic switch, which is connected to the second filtering output terminal;

the second resistor has an end connected to the second terminal of the symmetrical trigger diode and another end connected to the second electronic switch and first electronic switch;

the second electronic switch is connected to the second filtering output terminal; and

the fourth resistor has an end connected to the second terminal of the symmetrical trigger diode and another end connected to a positive terminal of the plurality of LED light sources.

9. The LED tube lamp of claim 8, wherein the resistance of the first resistor is smaller than that of the second resistor, and when the voltage at the positive terminal of the plurality of LED light sources exceeds an overvoltage value, the second electronic switch enters a conducting state and the first electronic switch enters a cutoff state, causing the thyristor to enter a conducting state by an electric potential at the second terminal of the symmetrical trigger diode, thus causing the over voltage protection circuit to be in a protection state to restrain or clamp down on a level of the filtered signal or the voltage between the first filtering output terminal and the second filtering output terminal.

10. The LED tube lamp of claim 5, wherein the thyristor comprises a bidirectional triode thyristor or a silicon controlled rectifier.

11. An LED tube lamp, comprising:

a lamp tube comprising a light transmissive portion and a reinforcing portion;

a light strip disposed inside the lamp tube and on the reinforcing portion;

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

a power supply module comprising a plurality of electronic components configured to drive the LED light sources,

wherein, at least one of the plurality of electronic components is disposed on the reinforcing portion and at least one of the plurality of electronic components is disposed on the light strip,

wherein, a rectifying circuit, a filtering circuit and an over voltage protection circuit are formed by interconnecting the plurality of electronic components, the filtering circuit is coupled to the rectifying circuit and is configured to receive a rectified signal from the rectifying circuit, the over voltage protection circuit coupled to the filtering circuit for detecting a filtered signal, the over voltage protection circuit configured to clamp the filtered signal when determining that the filtered signal is higher than a predefined over voltage protection value.

12. The LED tube lamp of claim 11, wherein the over voltage protection circuit comprises a voltage stabilization circuit.

13. The LED tube lamp of claim 12, wherein the voltage stabilization circuit comprises a zener diode.

14. The LED tube lamp of claim 11, further comprising a first end cap attached to a first end of the lamp tube and a second end cap attached to a second end of the lamp tube, wherein at least one of the plurality of electronic components is disposed in one of first end cap and the second end cap.

15. The LED tube lamp of claim 11, wherein the over voltage protection circuit is configured such that, in a protection state, the over voltage protection circuit limits or restrains a level of the filtered signal.

16. The LED tube lamp of claim 11, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal;

the over voltage protection circuit includes a voltage clamping circuit comprising a thyristor, wherein the thyristor has a first terminal coupled to the first filtering output terminal and a second terminal coupled to the second filtering output terminal; and

the thyristor is configured such that when a overvoltage condition of the plurality of LED light sources occurs the thyristor enters a conducting state, causing the voltage between the first filtering output terminal and the second filtering output terminal to be restrained or clamped down on.

17. The LED tube lamp of claim 16, wherein the over voltage protection circuit includes a capacitor, and the voltage clamping circuit further includes a symmetrical trigger diode;

the thyristor has a control terminal connected to a first terminal of the symmetrical trigger diode;

the symmetrical trigger diode has a second terminal connected to an end of the capacitor, which has another end connected to the second filtering output terminal; and

when an overvoltage condition of the plurality of LED light sources occurs, the thyristor enters the conducting state by an electric potential at the second terminal of the symmetrical trigger diode.

18. The LED tube lamp of claim 17, wherein the over voltage protection circuit further includes a voltage division circuit coupled to the symmetrical trigger diode and the filtering circuit;

the voltage division circuit is also coupled to detect a voltage of the plurality of LED light sources; and

when an overvoltage condition of the plurality of LED light sources occurs, the voltage division circuit causes the thyristor to enter the conducting state by an electric potential at the second terminal of the symmetrical trigger diode.

19. The LED tube lamp of claim 16, wherein the thyristor comprises a bidirectional triode thyristor or a silicon controlled rectifier.

20. An LED tube lamp, comprising:

a lamp tube comprising a light transmissive portion and a reinforcing portion;

a light strip disposed inside the lamp tube and on the reinforcing portion;

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

a power supply module comprising a plurality of electronic components configured to drive the LED light sources,

wherein, the plurality of electronic components are disposed on the light strip and the reinforcing portion,

wherein a rectifying circuit, a filtering circuit and an over voltage protection circuit are formed by interconnecting the plurality of electronic components, wherein the filtering circuit is coupled to the rectifying circuit and is configured to receive a rectified signal from the rectifying circuit, and

wherein the over voltage protection circuit is coupled to the filtering circuit for detecting a filtered signal, the over voltage protection circuit is configured to clamp the filtered signal when determining that the filtered signal is higher than a predefined over voltage protection value.

21. The LED tube lamp of claim 20, wherein the over voltage protection circuit comprises a voltage stabilization circuit.

22. The LED tube lamp of claim 21, wherein the voltage stabilization circuit comprises a zener diode.

23. The LED tube lamp of claim 20, wherein the over voltage protection circuit is configured such that, in a protection state, the over voltage protection circuit limits or restrains a level of the filtered signal.

24. The LED tube lamp of claim 20, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal;

the over voltage protection circuit includes a voltage clamping circuit comprising a thyristor, wherein the thyristor has a first terminal coupled to the first filtering output terminal and a second terminal coupled to the second filtering output terminal; and

the thyristor is configured such that when an overvoltage condition of the plurality of LED light sources occurs the thyristor enters a conducting state, causing the voltage between the first filtering output terminal and the second filtering output terminal to be restrained or clamped down on.

25. The LED tube lamp of claim 24, wherein the over voltage protection circuit includes a capacitor, and the voltage clamping circuit further includes a symmetrical trigger diode;

the thyristor has a control terminal connected to a first terminal of the symmetrical trigger diode;

the symmetrical trigger diode has a second terminal connected to an end of the capacitor, which has another end connected to the second filtering output terminal; and

when a overvoltage condition of the plurality of LED light sources occurs, the thyristor enters the conducting state by an electric potential at the second terminal of the symmetrical trigger diode.

26. The LED tube lamp of claim 25, wherein the over voltage protection circuit further includes a voltage division circuit coupled to the symmetrical trigger diode and the filtering circuit;

the voltage division circuit is also coupled to detect a voltage of the plurality of LED light sources; and

when a overvoltage condition of the plurality of LED light sources occurs, the voltage division circuit causes the thyristor to enter the conducting state by an electric potential at the second terminal of the symmetrical trigger diode.

27. The LED tube lamp of claim 24, wherein the thyristor comprises a bidirectional triode thyristor or a silicon controlled rectifier.