Hybrid light emitting diode tube

Patent metadata

Field	Value
Publication number	US-10920972-B2
Application number	US-201916404129-A
Country	US
Kind code	B2
Filing date	May 6, 2019
Priority date	May 7, 2018
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A lamp including a light source having at least one string of light emitting diodes on a printed circuit board present within a tube body; and end caps having a G13 pin layout on each end of the tube body. The lamp may further include an electrical isolation switch mounted on at least one of the end caps, wherein the electrical isolation switch provides shock protection from the lamp when installed into a ballast free fixture. The lamp may further include driver electronics having a filament detector portion provided by a passive resistance capacitor (RC) circuit that simulates the filament load of a fluorescent lamp when installed into a ballast containing fixture.

First claim

What is claimed is:

1. A lamp comprising:
a light source including at least one string of light emitting diodes on a printed circuit board present within a tube body;
end caps having pin contacts on each end of the tube body;
an electrical isolation switch mounted on at least one of the end caps, wherein the electrical isolation switch provides shock protection from the lamp when installed into a ballast free fixture; and
driver electronics including a filament detector portion provided by a passive resistance capacitor (RC) circuit that simulates the filament load of a fluorescent lamp when installed into a ballast containing fixture, wherein the driver electronics comprises a delay circuit between the filament detector portion and the light source, the delay circuit includes at least one gated MOSFET transistor, wherein when the gated MOSFET transistor is OFF the circuit is open for high voltage start up consistent with the filament load of the fluorescent lamp at start up, and after the high voltage start up the gated MOSFET transistor is ON for post start up operation of the light source.

2. The lamp of claim 1 , wherein the contacts have a G13 pin layout.

3. The lamp of claim 1 , wherein he light emitting diodes are surface mount device (SMD) light emitting diodes.

4. The lamp of claim 1 , wherein the electrical isolation switch comprises rocker switch, toggle switch, selector switch or a combination thereof.

5. The lamp of claim 1 , wherein the electrical isolation switch is present on each of said end cap of the lamp.

6. The lamp of claim 1 , wherein the ballast containing fixture comprises a high frequency (HF) ballast, a magnetic ballast, an instant start ballast, a programed start ballast or combination thereof.

7. The lamp of claim 1 , wherein when installed into the ballast free fixture, the lamp works on a direct line voltage of 120V/277V.

8. A lamp comprising:
a light source including at least one string of light emitting diodes on a printed circuit board present within a tube body;
end caps having contacts with a G13 pin layout on each end of the tube body;
an electrical isolation switch mounted on at least one of the end caps, wherein the electrical isolation switch provides shock protection from the lamp when installed into a ballast free fixture for a type B T8 lamp; and
driver electronics including a filament detector portion provided by a passive resistance capacitor (RC) circuit that simulates the filament load of a fluorescent lamp when installed into a ballast containing fixture for a T12 lamp or a type A T8 lamp, wherein the driver electronics comprises a delay circuit between the filament detector portion and the light source, the delay circuit includes at least one gated MOSFET transistor, wherein when the gated MOSFET transistor is OFF the circuit is open for high voltage start up consistent with the filament load of the fluorescent lamp at start up, and after the high voltage start up the gated MOSFET transistor is ON for post start up operation of the light source.

9. The lamp of claim 8 , wherein the light emitting diodes are surface mount device (SMD) light emitting diodes.

10. The lamp of claim 8 , wherein the electrical isolation switch comprises rocker switch, toggle switch, selector switch or a combination thereof.

11. The lamp of claim 8 , wherein the electrical isolation switch is present on each of said end cap of the lamp.

12. The lamp of claim 8 , wherein the drive electronics comprise a driver that is present on each end of the circuit board.

13. The lamp of claim 8 , wherein the passive resistance capacitor (RC) circuit provides a high start up voltage and low impedance following start up during normal operation when the lamp is installed into said ballast containing fixture.

14. The lamp of claim 8 , wherein when installed into the ballast free fixture the lamp works on a direct line voltage of 120V/277V.

15. A lamp comprising:
a light source including at least one string of light emitting diodes on a printed circuit board present within a tube body;
end caps having pin contacts on each end of the tube body;
an electrical isolation switch mounted on at least one of the end caps, wherein the electrical isolation switch provides shock protection from the lamp when installed into a ballast free fixture; and
driver electronics including a filament detector portion provided by a passive resistance capacitor (RC) circuit, in which when installed into a ballast containing fixture provides a high voltage during start up of the lamp and low impedance following start up during normal operation of the lamp, wherein the driver electronics comprises a delay circuit between the filament detector portion and the light source, the delay circuit includes at least one gated MOSFET transistor, wherein when the gated MOSFET transistor is OFF the circuit is open for said high voltage during start up consistent with the filament load of the fluorescent lamp at start up, and after the high voltage during start up the gated MOSFET transistor is ON for operation of said light source at said low impendence.

16. The lamp of claim 15 , wherein the light emitting diodes are surface mount device (SMD) light emitting diodes.

17. The lamp of claim 15 , wherein the electrical isolation switch comprises rocker switch, toggle switch, selector switch or a combination thereof.

18. The lamp of claim 15 , wherein the electrical isolation switch is present on each of said end cap of the lamp.

19. The lamp of daim 15 , wherein the ballast containing fixture comprises a high frequency (HF) ballast, a magnetic ballast, an instant start ballast, a programed start ballast, an electronic RS ballast or combination thereof.

20. The lamp of claim 15 , wherein when installed into the ballast free fixture works on a direct line voltage of 120V/277V.

Assignees

• Ledvance Llc

Inventors

• Ray Soumya Kanta
• Jeswani Anil
• Harrison Robert

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• Y02B20/30

  Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] · CPC title

• F21V23/026

  Fastening of transformers or ballasts · CPC title

• 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

• H05B45/3578

  Emulating the electrical or functional characteristics of discharge lamps · CPC title