Light fixture with at least one LED

Patent metadata

Field	Value
Publication number	US-11805579-B2
Application number	US-201716092902-A
Country	US
Kind code	B2
Filing date	Apr 7, 2017
Priority date	Apr 14, 2016
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

A light fixture having at least one LED and at least one filament, wherein the at least one filament is connected in series to the at least one LED. A current supplied to the at least one LED in the light fixture is regulated by the electrical properties of the at least one filament. Thus the at least one LED in the light fixture can be run without an electrical driver.

First claim

The invention claimed is:

1. A light fixture comprising:
at least one LED;
at least one filament, wherein the at least one filament is a glow wire connected in series to the at least one LED, wherein a current flowing through the filament always flows from the filament to the at least one LED, wherein the current supplied to the at least one LED is regulated by the filament and a part of the current flowing through the filament is converted into light energy which is mixed with a light emitted by the at least one LED;
a rectifier coupled in series to the at least one filament and the at least one LED; and
a glass bulb, wherein the at least one filament and the at least one LED is arranged within the glass bulb.

2. The light fixture of claim 1 , wherein the glass bulb is filled with at least one of a protective gas and a gas comprising at least one halogen.

3. The light fixture of claim 1 , wherein the light fixture has a first connector and a second connector for coupling to a supply voltage.

4. The light fixture of claim 1 , wherein the rectifier is not between the at least one filament and the at least one LED.

5. The light fixture of claim 1 , wherein the at least one LED comprises:
at least one first LED; and
at least one second LED connected to the at least one first LED in parallel.

6. The light fixture of claim 1 , wherein the at least one LED comprises:
at least one first LED; and
at least one second LED connected to the at least one first LED in series.

7. The light fixture of claim 1 , wherein:
the at least one LED comprises:
at least one first LED; and
at least one second LED connected to the at least one first LED; and

the at least one first LED and the at least one second LED have a different forward voltage.

8. The light fixture of claim 1 , wherein between 15% and 30% of a voltage drop across the at least one LED and the at least one filament occurs on the at least one LED.

9. The light fixture of claim 1 , wherein between 20% and 25% of a voltage drop across the at least one LED and the at least one filament occurs on the at least one LED.

10. The light fixture of claim 1 , wherein the light fixture comprises a thermal shield, wherein the thermal shield is arranged between the at least one LED and the at least one filament.

11. The light fixture of claim 1 , wherein the at least one LED and the at least one filament generate an optical performance, wherein between 70% and 90% of the optical performance is generated by the at least one LED.

12. The light fixture of claim 1 , wherein the at least one LED and the at least one filament generate an optical performance, wherein between 75% and 85% of the optical performance is generated by the at least one LED.

13. The light fixture of claim 1 , wherein the at least one LED and the at least one filament generate an optical performance, wherein 80% of the optical performance is generated by the at least one LED.

14. The light fixture of claim 1 , wherein the glass bulb is filled with a protective gas which comprises a mixture of 93% argon and 7% nitrogen.

15. A light fixture comprising:
at least one LED;
at least one filament, wherein the at least one filament is a glow wire connected in series to the at least one LED;
a rectifier, wherein the rectifier is connected in series to the at least one filament and the at least one LED, such that the rectifier feeds a current to the at least one filament and the at least one filament feeds the current to the at least one LED, wherein the current supplied to the at least one LED is regulated by the filament and a part of the current flowing through the filament is converted into light energy which is mixed with a light emitted by the at least one LED; and
a glass bulb, wherein the at least one filament and the at least one LED is arranged within the glass bulb.

16. A light fixture comprising:
at least one LED;
at least one filament, wherein the at least one filament is a glow wire connected in series to the at least one LED;
a rectifier, having at least two nodes, wherein the series connection of the at least one filament and the at least one LED is connected between the at least two nodes of the rectifier, wherein a current supplied to the at least one LED is regulated by the filament and a part of the current flowing through the filament is converted into light energy which is mixed with a light emitted by the at least one LED; and
a glass bulb, wherein the at least one filament and the at least one LED is arranged within the glass bulb.

17. The light fixture of claim 16 , wherein the at least two nodes comprises four nodes, wherein:
a first node and a second node are connected to a power source;
a third node is connected to the at least one LED; and
a fourth node is connected to the at least one filament.

18. The light fixture of claim 1 , wherein:
the at least one LED and the bridge rectifier share a printed circuit board; and
the at least one filament is not on the printed circuit board.

19. The light fixture of claim 1 , wherein within the glass bulb:
the at least one LED is disposed in a first gaseous atmosphere; and
the at least one filament is disposed in a second gaseous atmosphere which differs from the first gaseous atmosphere.

Assignees

• Ledvance Gmbh

Inventors

• Albrecht Tony
• Hofmann Markus

Classifications

• F21Y2113/20

  of different form · CPC title

• H05B35/00 Primary

  Electric light sources using a combination of different types of light generation · CPC title

• F21K9/232

  specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb · CPC title

• H05B45/00

  Circuit arrangements for operating light-emitting diodes [LED] · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title