LIGHT EMITTING DIODE SYSTEM

• US 20110043136A1
• Filed: 04/29/2009
• Published: 02/24/2011
• Est. Priority Date: 05/05/2008
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Radermacher, Harald Josef Gunther
• Granted Patent: US 8,664,892 B2
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/305 Frequency-control circuits
• CPC Class Codes: H05B 45/3578 Emulating the electrical or functional characteristics of discharge lamps
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The invention relates to a light emitting system (100), the system comprising a light emitting diode (104), a socket adapter for retrofitting a fluorescent lamp and an electric circuit (112; 200; 306), the electric circuit (112; 200; 306) being adapted for emulating the presence of a fluorescent lamp to a fluorescent lamp driver (102).

Claims

1. A light emitting system comprising a light emitting diode, a socket adapter for retrofitting a fluorescent lamp and an electric circuit for emulating the presence of a fluorescent lamp to a fluorescent lamp driver by emulating at least one of a fluorescent lamp filament resistance and a fluorescent lamp impedance to the fluorescent lamp driver, the electric circuit being configured for emulating the fluorescent lamp impedance in a frequency range unused in fluorescent lamp operation procedures.

4. The system of claim 1, wherein the electric circuit is further configured to draw nominal power from the fluorescent lamp driver at a fluorescent lamp starting process, the nominal power being sufficient to power the light emitting diode for light emission.

5. The system of claim 1, wherein the electric circuit is configured to detect the fluorescent lamp driver status and/or type based on the frequency and/or amplitude and/or power sequence of the fluorescent lamp driving current supplied by the driver.

6. The system of claim 1, wherein the electric circuit is configured for powering a set of the light emitting diodes, wherein a subset of the set of light emitting diodes is powered for light emission by the electric circuit, wherein the electric circuit is further configured for distributing the power delivered from the fluorescent lamp driver to the subsets of light emitting diodes based on the characteristics of the delivered power.

7. The system of claim 1, wherein the electric circuit is configured to perform the emulation for signaling the fluorescent lamp driver a required predetermined power requirement of the light emitting system.

8. The system of claim 7, further comprising means for detecting light emitting system characteristics, said light emitting system characteristics comprising actual light emission characteristics and/or temperature of the light emitting system and/or environmental conditions of the environment in which the light emitting system is being operated and/or the age of the light emitting system, wherein the signaled light emitting diode driving power requirement depends on said detected light emitting system characteristics.

9. The system of claim 1, wherein the electric circuit is configured for sending a signal indicating a light emitting diode driving power requirement to the fluorescence lamp driver.

10. The system of claim 9, further comprising means for detecting light emitting system characteristics, said light emitting system characteristics comprising actual light emission characteristics and/or temperature of the light emitting system and/or environmental conditions of the environment in which the light emitting system is being operated and/or the age of the light emitting system, wherein the light emitting diode driving power requirement depends on said detected light emitting system characteristics.

11. The system of claim 9, wherein the signal indicating the light emitting diode driving power requirement is a digital signal.

12. The system if claim 1, further comprising means for receiving remote control signals.

13. A fluorescent lamp driver, the lamp driver being configured to power a fluorescent lamp and a retrofitting light emitting diode system according to claim 1 wherein the lamp driver is further configured for detecting the light emitting diode system power requirements, based on at least one of a resistance and an impedance response of the light emitting diode system, and wherein the lamp driver is further configured for performing the detection in a frequency range unused in fluorescent lamp operation procedures.

15. The lamp driver according to claim 13, wherein the driver is configured to perform the detection of the light emitting diode system power requirements based on the digital signals received from the light emitting diode system.

2-3. -3. (canceled)

14. (canceled)