LED tube lamp compatible with different sources of external driving signal

Patent metadata

Field	Value
Publication number	US-9894732-B2
Application number	US-201615383160-A
Country	US
Kind code	B2
Filing date	Dec 19, 2016
Priority date	Oct 17, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

An LED tube lamp is provided. The LED tube lamp includes a lamp tube having at least two external connection terminals, for receiving an external driving signal; a rectifying circuit for rectifying the external driving signal to produce a rectified signal; an LED lighting module comprising an LED module, for emitting light; and a ballast interface circuit coupled between the external connection terminals and the LED lighting module, and comprising a detection circuit configured to determine whether the external driving signal is a high frequency or high voltage signal according to the frequency or voltage level of the rectified signal, wherein the ballast interface circuit is configured such that when the external driving signal is determined to be a high frequency or high voltage signal, the ballast interface circuit causes current conduction in the LED module for emitting light.

First claim

What is claimed is:

1. A light-emitting diode (LED) tube lamp, comprising:
a lamp tube;
at least two external connection terminals for the lamp tube, for receiving an external driving signal;
a rectifying circuit for rectifying the external driving signal to produce a rectified signal;
an LED lighting module comprising an LED module, for emitting light; and
a ballast interface circuit coupled between the external connection terminals and the LED lighting module, and comprising a detection circuit configured to determine whether the external driving signal is a high frequency or high voltage signal according to the frequency or voltage level of the rectified signal, wherein the ballast interface circuit is configured such that when the external driving signal is determined to be a high frequency or high voltage signal, the ballast interface circuit causes current conduction in the LED module for emitting light; the ballast interface circuit further comprises an electronic switch coupled to the detection circuit, and the detection circuit comprises a voltage detection circuit coupled to the electronic switch; and the voltage detection circuit is configured to determine whether the external driving signal is a high frequency or high voltage signal according to the voltage level of the rectified signal, in order to control current conduction or cutoff of the electronic switch, wherein the current conduction causes current conduction in the LED module and the cutoff causes an open circuit for the LED module.

2. A light-emitting diode (LED) tube lamp, comprising:
a lamp tube;
at least two external connection terminals for the lamp tube, for receiving an external driving signal;
a rectifying circuit for rectifying the external driving signal to produce a rectified signal; an LED lighting module comprising an LED module, for emitting light; and
a ballast interface circuit coupled between the external connection terminals and the LED lighting module, and comprising a detection circuit configured to determine whether the external driving signal is a high frequency or high voltage signal according to the frequency or voltage level of the rectified signal, wherein the ballast interface circuit is configured such that when the external driving signal is determined to be a high frequency or high voltage signal, the ballast interface circuit causes current conduction in the LED module for emitting light;
wherein the ballast interface circuit further comprises an electronic switch coupled to the detection circuit, and the detection circuit comprises a frequency determination circuit coupled to the electronic switch; and
wherein the frequency determination circuit is configured to determine whether the external driving signal is a high frequency or high voltage signal according to the frequency of the rectified signal, in order to control current conduction or cutoff of the electronic switch, wherein the current conduction causes current conduction in the LED module and the cutoff causes an open circuit for the LED module.

3. A light-emitting diode (LED) tube lamp, comprising:
a lamp tube;
at least two external connection terminals for the lamp tube, for receiving an external driving signal;
a rectifying circuit for rectifying the external driving signal to produce a rectified signal; an LED lighting module comprising an LED module, for emitting light; and
a ballast interface circuit coupled between the external connection terminals and the LED lighting module, and comprising a detection circuit configured to determine whether the external driving signal is a high frequency or high voltage signal according to the frequency or voltage level of the rectified signal, wherein the ballast interface circuit is configured such that when the external driving signal is determined to be a high frequency or high voltage signal, the ballast interface circuit causes current conduction in the LED module for emitting light;
wherein the ballast interface circuit further comprises a circuit branch coupled to the detection circuit, and the detection circuit comprises a control circuit and an electronic switch; and
wherein the circuit branch is configured to detect the voltage level of the rectified signal and then generate a detection signal; and the control circuit is configured to determine whether the external driving signal is a high frequency or high voltage signal according to the detection signal, and to control current conduction or cutoff of the electronic switch, wherein the current conduction causes current conduction in the LED module and the cutoff causes an open circuit for the LED module.

4. A light-emitting diode (LED) tube lamp, comprising:
a lamp tube;
at least two external connection terminals for the lamp tube, for receiving an external driving signal;
a rectifying circuit for rectifying the external driving signal to produce a rectified signal;
an LED lighting module comprising an LED module, for emitting light; and
a ballast interface circuit coupled between the external connection terminals and the LED lighting module, and comprising a detection circuit configured to determine whether the external driving signal is a high frequency or high voltage signal according to the frequency or voltage level of the rectified signal, wherein the ballast interface circuit is configured such that when the external driving signal is determined to be a high frequency or high voltage signal, the ballast interface circuit causes current conduction in the LED module for emitting light;
wherein the detection circuit comprises a thyristor, which is configured to conduct current or be cutoff depending on the voltage level of the rectified signal; and
wherein when the external driving signal is a high frequency or high voltage signal, the thyristor conducts current after a predefined delay of time upon the external driving signal being input to the LED tube lamp.

5. A light-emitting diode (LED) tube lamp, comprising:
a lamp tube;
at least two external connection terminals for the lamp tube, for receiving an external driving signal;
a rectifying circuit for rectifying the external driving signal to produce a rectified signal; an LED lighting module comprising an LED module, for emitting light; and
a ballast interface circuit coupled between the external connection terminals and the LED lighting module, and comprising a detection circuit configured to determine whether the external driving signal is a high frequency or high voltage signal according to the frequency or voltage level of the rectified signal, wherein the ballast interface circuit is configured such that when the external driving signal is determined to be a high frequency or high voltage signal, the ballast interface circuit causes current conduction in the LED module for emitting light;
wherein the detection circuit determines that the external driving signal is a high frequency or high voltage signal when determining that the voltage level of the rectified signal is higher than a predefined first threshold level;
wherein the ballast interface circuit causes an open circuit for the LED module when the detection circuit determines that the voltage level of the rectified signal is higher than a predefined second threshold level but lower than the predefined first threshold level, wherein the predefined first threshold level is higher than the predefined second threshold level; and
wherein the ballast interface circuit causes current conduction in the LED module when the detection circuit determines that the voltage level of the rectified signal is lower than the predefined second threshold level.

6. A light-emitting diode (LED) tube lamp, comprising:
a lamp tube;
at least two external connection terminals for the lamp tube, for receiving an

Assignees

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

Inventors

• Xiong Aiming
• Liu Xintong
• Wu Xiaojia
• Hu Hechen

Classifications

• F21V7/28

  characterised by coatings · CPC title

• F21K9/275 Primary

  Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings (F21K9/278 takes precedence) · CPC title

• F21V23/06

  the elements being coupling devices {, e.g. connectors} · CPC title

• F21K9/278

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

• F21Y2103/10

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