Led tube lamp

Patent metadata

Field	Value
Publication number	US-2016270184-A1
Application number	US-201615055630-A
Country	US
Kind code	A1
Filing date	Feb 28, 2016
Priority date	Mar 10, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

An LED tube lamp includes a lamp tube, having a first pin and a second pin for receiving an external driving signal; a first rectifying circuit for rectifying the external driving signal; a filtering circuit for producing a filtered signal; an LED lighting module configured for emitting light; and a ballast-compatible circuit, coupled to the first rectifying circuit, and containing a metallic electrode, a bimetallic strip, and a heating filament in an inert gas. A spacing is configured between the bimetallic strip and the metallic electrode, and the bimetallic strip includes two metallic strips with different temperature coefficients. When the external driving signal is initially input at the first pin and second pin, the ballast-compatible circuit will be in an open-circuit state, until entering a conduction state, which allows a current to flow through the LED lighting module thus allowing the LED tube lamp to emit light.

First claim

What is claimed is:

1 . A light emitting diode (LED) tube lamp, comprising:
a lamp tube, having a first pin and a second pin for receiving an external driving signal; a first rectifying circuit coupled to the first pin and the second pin and configured to rectify the external driving signal to produce a rectified signal; a filtering circuit coupled to the first rectifying circuit and configured to filter the rectified signal to produce a filtered signal; an LED lighting module coupled to the filtering circuit and configured to receive the filtered signal for emitting light; and a ballast-compatible circuit coupled to the first rectifying circuit and containing a metallic electrode, a bimetallic strip, and a heating filament in an inert gas, wherein the bimetallic strip is connected to the heating filament, and a spacing is configured between the bimetallic strip and the metallic electrode, wherein the bimetallic strip includes two metallic strips, and a first metallic strip of the two metallic strips that is closer to the metallic electrode has a smaller temperature coefficient than that of the second metallic strip of the two metallic strips that is further away from the metallic electrode, and wherein when the external driving signal is initially input at the first pin and second pin, the ballast-compatible circuit will be in an open-circuit state and does not allow the LED tube lamp to emit light, and when the ballast-compatible circuit is in a conduction state, which allows a current input at the first pin and second pin to flow through the LED lighting module, the LED tube lamp emits light.

2 . The LED tube lamp according to claim 1 , wherein the ballast-compatible circuit comprising a housing and the metallic electrode and the heating filament protrude from the housing, so that each of the metallic electrode and the heating filament has a portion outside of the housing,
wherein the portion outside of the housing has a ballast-compatible circuit input/output terminal, and wherein the housing contains the inert gas and the bimetallic strip, and the bimetallic strip is connected to the heating filament.

3 . The LED tube lamp according to claim 2 , wherein when the external driving signal is initially input at the first pin and second pin an open-circuit state is generated between the ballast-compatible circuit input/output terminals of the metallic electrode and the heating filament, respectively, until the external driving signal increases in a delay, and wherein when the external driving signal reaches a defined level such that the inert gas is heated to cause the bimetallic strip to swell toward the metallic electrode, with this swelling eventually causing a connection between the bimetallic strip and the metallic electrode, an electrical conduction is caused between the two ballast-compatible circuit input/output terminals, allowing a current to flow through and heat the heating filament to cause the temperature of the bimetallic strip to exceed a defined temperature.

4 . The LED tube lamp according to claim 1 , wherein the ballast-compatible circuit is coupled between the first pin and the first rectifying circuit or second pin and the first rectifying circuit.

5 . The LED tube lamp according to claim 1 , wherein the ballast-compatible circuit is coupled between the filtering circuit and the first rectifying circuit.

6 . The LED tube lamp according to claim 1 , wherein the lamp tube further has a third pin and a fourth pin for receiving an external driving signal, and the LED tube lamp further includes:
a second rectifying circuit coupled to the third and fourth pins, for rectifying the external driving signal.

7 . The LED tube lamp according to claim 6 , wherein the ballast-compatible circuit is coupled between the filtering circuit and the second rectifying circuit.

8 . The LED tube lamp according to claim 1 , wherein upon the external driving signal being initially input at the first pin and second pin, the ballast-compatible circuit will not enter a conduction state until a period of delay passes, wherein the period of delay is between about 10 millisecond (ms) and 1 second.

9 . The LED tube lamp according to claim 1 , wherein the period is between about 10 millisecond (ms) and 300 ms.

10 . A light emitting diode (LED) tube lamp, comprising:
a lamp tube having a first pin and a second pin and configured to receive an external driving signal; a first rectifying circuit coupled to the first pin and the second pins and configured to rectify the external driving signal to produce a rectified signal, wherein the first rectifying circuit comprises a rectifying unit and a terminal adapter circuit, and the rectifying unit is coupled to the terminal adapter circuit and is capable of performing half-wave rectification, and the terminal adapter circuit is configured to transmit the external driving signal received via at least one of the first pin and the second pin; a filtering circuit coupled to the first rectifying circuit and configured to filter the rectified signal to produce a filtered signal; an LED lighting module coupled to the filtering circuit and configured to receive the filtered signal for emitting light; and a ballast-compatible circuit coupled between the rectifying unit and the terminal adapter circuit, and containing a metallic electrode, a bimetallic strip, and a heating filament in an inert gas, wherein the bimetallic strip is connected to the heating filament, and a spacing is configured between the bimetallic strip and the metallic electrode, wherein the bimetallic strip includes two metallic strips, and one of the two metallic strips that is closer to the metallic electrode has a smaller temperature coefficient than that of the other of the two metallic strips that is further away from the metallic electrode, and wherein when the external driving signal is initially input at the first pin and second pin, the ballast-compatible circuit is in an open-circuit state and does not allow the LED tube lamp to emit light, and when the ballast-compatible circuit enters a conduction state, which allows a current input at the first pin and the second pin to flow through the LED lighting module, the LED tube lamp emits light.

11 . The LED tube lamp according to claim 10 , wherein the ballast-compatible circuit comprising a housing, and the metallic electrode and the heating filament protrude from the housing, so that each of the metallic electrode and the heating filament has a portion outside of the housing,
wherein the portion outside of the housing has a ballast-compatible circuit input/output terminal, and wherein the housing contains the inert gas and the bimetallic strip, and the bimetallic strip is connected to the heating filament.

12 . The LED tube lamp according to claim 11 , wherein when the external driving signal is initially input at the first pin and second pin, an open-circuit state is generated between the ballast-compatible circuit input/output terminals of the metallic electrode and the heating filament, respectively, until the external driving signal increases in a delay, and wherein when the external driving signal reaches a defined level such that the inert gas is heated to cause the bimetallic strip to swell toward the metallic electrode, with this swelling eventually causing a connection between the bimetallic strip and the metallic electrode, an electrical conduction is caused between the two ballast-compatible circuit input/output terminals, allowing a current to flow through and heat the heating filament to cause the temperature of the bimetallic strip to exceed a defined temperature.

Assignees

• Jiaxing Super Lighting Electric Appliance Co Ltd

Inventors

• Xiong Aiming
• Ye Qifeng
• Zhang Yueqiang

Classifications

• F21K9/27 Primary

  Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes · CPC title

• F21Y2103/10

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

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• H05B45/59

  for reducing or suppressing flicker or glow effects · CPC title

• H05B45/50

  responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits · CPC title