LED tube lamp having mode switching circuit

Patent metadata

Field	Value
Publication number	US-9521718-B2
Application number	US-201615084483-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	Sep 28, 2014
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

The LED tube lamp includes a lamp tube configured to receive an external driving signal; a rectifying circuit configured to rectify the external driving signal to produce a rectified signal; a filtering circuit coupled to the rectifying circuit, and configured to filter the rectified signal to produce a filtered signal, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal; an LED lighting module coupled to the filtering circuit, wherein the LED lighting module includes a driving circuit having a first driving output terminal and a second driving output terminal and configured to receive the filtered signal to produce a driving signal, and an LED module configured to receive the driving signal and emit light; and a mode switching circuit coupled to at least one of the first and the second filtering output terminal and at least one of the first and the second driving output terminal, and configured to determine to perform one of a first driving mode and a second driving mode.

First claim

What is claimed is:

1. A light-emitting diode (LED) tube lamp, comprising:
a lamp tube, configured to receive an external driving signal;
a rectifying circuit, configured to rectify the external driving signal to produce a rectified signal;
a filtering circuit, coupled to the rectifying circuit, and configured to filter the rectified signal to produce a filtered signal, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal;
an LED lighting module, coupled to the filtering circuit, wherein the LED lighting module includes a driving circuit having a first driving output terminal and a second driving output terminal and configured to receive the filtered signal to produce a driving signal, and an LED module coupled between the first and the second driving output terminals and configured to receive the driving signal and emit light; and
a mode switching circuit, coupled to at least one of the first filtering output terminal and the second filtering output terminal and at least one of the first driving output terminal and the second driving output terminal, and configured to select between performing one of a first driving mode and a second driving mode,
wherein the LED tube lamp is configured such that the filtered signal is input to the driving circuit in the first driving mode, and the filtered signal is input to the LED module as the driving signal by bypassing the driving circuit in the second driving mode.

2. The LED tube lamp according to claim 1 , wherein the mode switching circuit is configured to select between inputting the filtered signal to one of the driving circuit and the LED module based on a frequency of the external driving signal.

3. The LED tube lamp according to claim 1 ,
wherein the mode switching circuit is configured to input the filtered signal to the LED module when a frequency of the external driving signal is higher than a predefined mode switching frequency, and
wherein the mode switching circuit is configured to input the filtered signal to the driving circuit when the frequency of the external driving signal is lower than the predefined mode switching frequency.

4. The LED tube lamp according to claim 1 , wherein the driving circuit further includes a switch, a diode, and an inductor,
a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the second filtering output terminal, and a control pin of the switch is coupled to a controller,
a cathode of the diode is coupled to the first filtering output terminal and the first driving output terminal,
a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the mode switching circuit.

5. The LED tube lamp according to claim 4 , wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal,
the first terminal is coupled to the second driving output terminal,
the second terminal is coupled to the second filtering output terminal, and
the third terminal is coupled to the second pin of the inductor.

6. The LED tube lamp according to claim 1 , wherein the driving circuit further includes a switch, a diode, and an inductor,
a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the mode switching circuit, and a control pin of the switch is coupled to a controller,
a cathode of the diode is coupled to the first filtering output terminal and the first driving output terminal,
a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the second driving output terminal.

7. The LED tube lamp according to claim 6 , wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal,
the first terminal is coupled to the second filtering output terminal,
the second terminal is coupled to the second driving output terminal, and
the third terminal is coupled to the second pin of the switch.

8. The LED tube lamp according to claim 1 , wherein the driving circuit further includes a switch, a diode, and an inductor,
a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the second filtering output terminal and the second driving output terminal, and a control pin of the switch is coupled to a controller,
a cathode of the diode is coupled to the first driving output terminal,
a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the mode switching circuit.

9. The LED tube lamp according to claim 8 , wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal,
the first terminal is coupled to the first filtering output terminal,
the second terminal is coupled to the first driving output terminal, and
the third terminal is coupled to the second pin of the inductor.

10. The LED tube lamp according to claim 1 , wherein the driving circuit further includes a switch, a diode, and an inductor,
a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the second filtering output terminal and the second driving output terminal, and a control pin of the switch is coupled to a controller,
a cathode of the diode is coupled to the mode switching circuit,
a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the first filtering output terminal.

11. The LED tube lamp according to claim 10 , wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal,
the first terminal is coupled to the first driving output terminal,
the second terminal is coupled to the first filtering output terminal, and
the third terminal is coupled to the cathode of the diode.

12. The LED tube lamp according to claim 1 , wherein the driving circuit further includes a switch, a diode, and an inductor,
a first pin of the switch is coupled to the mode switching circuit, a second pin of the switch is coupled to a cathode of the diode, and a control pin of the switch is coupled to a controller,
an anode of the diode is coupled to the second filtering output terminal and the second driving output terminal,
a first pin of the inductor is coupled to the second pin of the switch, and a second pin of the inductor is coupled to the first driving output terminal.

13. The LED tube lamp according to claim 12 , wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal,
the first terminal is coupled to the first filtering output terminal,
the second terminal is coupled to the first driving output terminal, and the third terminal is coupled to the first pin of the switch.

14. The LED tube lamp according to claim 1 , wherein the driving circuit further includes a switch, a diode, and an inductor,
a first pin of the switch is coupled to the first filtering output terminal, a second pin of the switch is coupled to a cathode of the diode, and a control pin of the switch is coupled to a controller,
an anode of the diode is coupled to the second filtering output terminal and the second driving output terminal,
a first pin of the inductor is coupled to the second pin of the switch, and a second pin of the inductor is coupled to the mode switching circuit.

Assignees

• Jiaxing Super Lighting Electric Appliance Co Ltd
• Jiaxing Super Lighting Electric Appliance Co Lti

Inventors

• Xiong Aiming
• Liu Xintong

Classifications

• F21K9/278 Primary

  Arrangement or mounting of circuit elements integrated in the light source · CPC title

• F21V29/83

  the elements having apertures, ducts or channels, e.g. heat radiation holes · CPC title

• F21Y2103/10

  comprising a linear array of point-like light-generating elements · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V23/006

  the substrate being distinct from the light source holder · CPC title