DIMMABLE LED LUMINAIRE

• US 20100277067A1
• Filed: 04/29/2010
• Published: 11/04/2010
• Est. Priority Date: 04/30/2009
• Status: Abandoned Application

• Current Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Henderson, David, Maxik, Fredric S., Widjaja, Addy S.
• Application Number:
  US12/770,136
• Publication Number:
  US 20100277067A1
• Time in Patent Office: Days
• US Class Current: 315/32
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 3/061 the material being glass
• CPC Class Codes: F21V 3/062 the material being plastics
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/355 Power factor correction [PFC]; Reactive power compensation
• CPC Class Codes: H05B 45/3575 by means of dummy loads or bleeder circuits, e.g. for dimmers
• CPC Class Codes: H05B 45/36 Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• CPC Class Codes: H05B 45/37 Converter circuits

Abstract

A luminaire includes an Edison type electrical base, an optic, and a heat sink disposed between the base and the optic. An LED driver circuit is disposed at least partially within the heat sink, and is disposed in electrical communication with the base. An LED assembly is disposed in thermal communication with a surface of the heat sink, and in electrical communication with the driver circuit, the LED assembly includes an LED. The driver circuit includes circuitry that converts an AC signal at the base to a DC signal and provides the DC signal to the LED assembly, the circuitry includes holding current circuitry that produces a holding current for an electrical dimmer disposed upstream of the base in response to a current to the LED assembly being reduced for light dimming purposes.

Claims

1. A luminaire, comprising:

an Edison type electrical base, an optic, and a heat sink disposed between the base and the optic;

an LED driver circuit disposed at least partially within the heat sink, and disposed in electrical communication with the base; and

an LED assembly disposed in thermal communication with a surface of the heat sink, and in electrical communication with the driver circuit, the LED assembly comprising an LED;

the driver circuit comprising circuitry that converts an AC signal at the base to a DC signal and provides the DC signal to the LED assembly, the circuitry comprising holding current circuitry that produces a holding current for an electrical dimmer disposed upstream of the base in response to a current to the LED assembly being reduced for light dimming purposes.

2. The luminaire of claim 1, wherein the circuitry of the driver circuit further comprises:

rectifier circuitry, disposed upstream of the holding current circuitry, that rectifies the AC signal;

correction circuitry, disposed downstream of the holding current circuitry, that performs power factor correction and supply voltage correction;

LED output circuitry, disposed downstream of the correction circuitry, that provides the DC signal to the LED assembly; and

a controller disposed in signal communication with the holding current circuitry and the LED output circuitry, wherein the controller comprises a microprocessor responsive to a voltage at the holding current circuitry for producing a control signal to the holding current circuitry for producing the holding current.

3. The luminaire of claim 2, wherein the circuitry of the driver circuit further comprises:

constant off circuitry, disposed downstream of the correction circuitry, that reduces electrical noise at the LED.

4. The luminaire of claim 1, wherein the circuitry of the driver circuit further comprises:

an EMI filter and a rectifier, both disposed upstream of the holding current circuitry, the EMI filter being disposed proximate the base for receiving the AC signal and being adapted and configured for filtering electrical noise ahead of the rectifier.

5. The luminaire of claim 1, further comprising:

a stem portion disposed between the Edison type electrical base and the heat sink, the driver circuit being disposed at least partially within the stem portion; and

an encapsulant disposed fixing the driver circuit and the stem portion.

6. The luminaire of claim 5, further comprising:

a support member disposed between the driver circuit and the stem portion, the encapsulant being disposed fixing the support member to the driver circuit, and to the stem portion.

7. The luminaire of claim 1, wherein the Edison type electrical base, the optic, and the heat sink, collectively have a profile so configured and dimensioned as to be interchangeable with a standard A19 light bulb, and the LED driver circuit and the LED assembly are so configured and dimensioned as to be disposed completely within the A19 profile.

8. A luminaire, comprising:

an Edison type electrical base, an optic, and a heat sink disposed between the base and the optic, wherein the base, the optic, and the heat sink, collectively have a profile so configured and dimensioned as to be interchangeable with at least one of a standard A19 light bulb, a standard G25 light bulb, a standard R20 light bulb, a standard R30 light bulb, and a standard R38 light bulb;

an LED driver circuit disposed in electrical communication with the base; and

an LED assembly disposed in thermal communication with a surface of the heat sink, and in electrical communication with the driver circuit, the LED assembly comprising an LED;

the driver circuit comprising circuitry that converts an AC signal at the base to a DC signal and provides the DC signal to the LED assembly;

wherein the LED driver circuit and the LED assembly are so configured and dimensioned as to be disposed completely within the respective A19, G25, R20, R30 or R38 profile.

9. A driver circuit for an LED light source connectable to an electrical dimmer disposed upstream of the light source, the driver circuit comprising:

holding current circuitry that produces a holding current for the electrical dimmer in response to a current to the LED light source being reduced for light dimming purposes;

rectifier circuitry, disposed upstream of the holding current circuitry, that rectifies an AC signal into a DC signal;

correction circuitry, disposed downstream of the holding current circuitry, that performs power factor correction and supply voltage correction;

LED output circuitry, disposed downstream of the correction circuitry, that provides the DC signal to the LED light source; and

a controller disposed in signal communication with the holding current circuitry and the LED output circuitry, wherein the controller comprises a microprocessor responsive to a voltage at the holding current circuitry for producing a control signal to the holding current circuitry for producing the holding current.

10. The driver circuit of claim 9, further comprising:

constant off circuitry, disposed downstream of the correction circuitry, that reduces electrical noise at the LED light source.

11. The driver circuit of claim 9, further comprising:

an EMI filter and a rectifier, both disposed upstream of the holding current circuitry, the EMI filter being disposed for receiving the AC signal and being adapted and configured for filtering electrical noise ahead of the rectifier.