Integrated lamp with feedback and wireless control

• US 20070007898A1
• Filed: 09/07/2004
• Published: 01/11/2007
• Est. Priority Date: 09/09/2003
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Bruning, Gert
• Granted Patent: US 7,521,872 B2
• Time in Patent Office: Days
• US Class Current: 315/34
• 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 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 23/045 the sensor receiving a signal from a remote controller
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A lamp assembly (50) employs a reflector (52) defining a light reflecting area (53), and a heat sink (54) defining a circuit housing area (55). A LED assembly (51) is disposed within the light reflecting area (53) and heat sink (54) dissipates heat away from LED assembly (51). One or more LEDs of LED assembly (51) emit a light in response to a flow of a LED current through the LEDs. One or more optical power sensors of LED assembly (51) sense an emission of the light by LED(s). A LED driver circuit (30) is disposed within the circuit housing area (55) to control the flow of the LED current through the LED(s) as a function of a sensing of the emission of the light by the optical power sensor(s) and a desired level of one or more lighting variables associated with the LED(s).

Claims

1. A lamp assembly (50), comprising:

a reflector (52) defining a light reflecting area (53);

a heat sink (54) defining a circuit housing area (55);

a LED assembly (20) disposed within said light reflecting area (53) and in thermal communication with said heat sink (54) to dissipate heat away from said LED assembly (20), said LED assembly (20) including

at least one LED (21) operable to emit a light in response to a flow of a LED current (I_LED) through said at least one LED (21), and

at least one optical power sensor (22) operable to sense an emission of the light by said at least one LED (21); and

a LED driver circuit (30) disposed within said circuit housing area (55), said LED driver circuit in electrical communication with said LED assembly (20) to control the flow of the LED current (I_LED) through said at least one LED (21) as a function of a sensing of the emission of the light by said at least one optical power sensor (22).

2. The lamp assembly (50) of claim 1, wherein said LED driver circuit (30) includes:

a transceiver (35) operable to receive a communication of at least one lighting variable associated with the emission of the light by said at least one LED (21),

wherein the flow of the LED current (I_LED) through said at least one LED (21) is a function of the sensing of the emission of the light by said at least one photo sensor (22) and a reception of the communication of the at least one lighting variable by said transceiver (37).

3. The lamp assembly (50) of claim 2, further comprising:

an antenna (36) operable to transmit the communication of the at least one lighting variable to said transceiver (35).

4. The lamp assembly (50) of claim 2, further comprising:

a controller (31) in electric communication with said transceiver (35) to communicate a LED control signal (CS5) indicative of the at least one lighting variable to said transceiver (35).

5. The lamp assembly (50) of claim 2, wherein said LED driver circuit (40) further includes:

an error detector (37) for generating a correction light value (CLV) indicative of a differential between a sensed light value (SLV) and a desired light value (DLV), the sensed light value (SLV) being indicative of the sensing of the emission of the light by said at least one optical power sensor (22), the desired light value (DLV) being indicative of the reception of the communication of the at least one lighting variable by said transceiver (35).

6. The lamp assembly (50) of claim 5, wherein said LED driver circuit (30) further includes:

a controller (31) in electrical communication with said error detector (37) to receive the correction light value (CLV), said controller (31) operable to generate a LED control signal (CS2) as a function of the correction light value (CLV).

7. The lamp assembly (50) of claim 6, wherein said LED driver circuit (30) further includes:

a power circuit (32) in electrical communication with said controller (31) to receive the LED control signal (CS2), said power circuit (32) operable to direct the flow of the LED current (I_LED) through said at least one LED (21) as a function of the LED control signal (CS2).

8. The lamp assembly (50) of claim 1, wherein said at least one LED (21) includes a plurality of LED arrays (LED_R, LED_G, LED_B, LED_T).

9. A lamp assembly (50), comprising:

a reflector (52) defining a light reflecting area (53);

a heat sink (54) defining a circuit housing area (55);

a LED assembly (20) disposed within said light reflecting area (53) and in thermal communication with said heat sink (54) to dissipate heat away from said LED assembly (20), said LED assembly (20) including

LED means (LED_R, LED_G, LED_B, LED_A) for emitting a light in response to a flow of a LED current (I_LED) through said LED means (LED_R, LED_G, LED_B, LED_A), and

optical sensor means (PS) for sensing an emission of the light by said LED means (LED_R, LED_G, LED_B, LED_A); and

a LED driver circuit (30) disposed within said circuit housing area (55), said LED driver circuit including means (31-37) for controlling the flow of the LED current (I_LED) through said LED means (LED_R, LED_G, LED_B, LED_A) as a function of a sensing of the emission of the light by said optical sensor means (PS).