Constant Temperature Light Emitting Diode Lighting System

• US 20130181611A1
• Filed: 01/14/2012
• Published: 07/18/2013
• Est. Priority Date: 01/14/2012
• Status: Active Grant

• Current Assignee: Yang Pan
• Original Assignee: Yang Pan
• Inventors: Pan, Yang
• Granted Patent: US 8,643,285 B2
• Time in Patent Office: Days
• US Class Current: 315/151
• CPC Class Codes: H05B 45/18 using temperature feedback

Abstract

A power management system for a lighting system including at least one lighting emitting diode is disclosed. In one embodiment, the light emitting diode(s) of the lighting system are operated under a constant temperature. In another embodiment, the light emitting diode(s) of the lighting system are operated under a constant temperature difference to the ambient temperature. A thermal feedback loop is employed to achieve the constant temperature or the constant temperature difference.

Claims

1. A light emitting diode lighting system comprising:

(a) at least one light emitting diode;

(b) a power supply; and

(c) a power management system that controls operating temperature of said diode(s) to oscillate around a predetermined value in a predetermined range.

2. The system as recited in claim 1, wherein said power management system further comprises a comparator including a pair of inputs and an output, wherein one input is coupled to an output of a temperature sensor and another input is coupled to a reference.

3. The system as recited in claim 2, wherein the output of the comparator is coupled to a power modulator including a pulse width modulator or a bit stream modulator that modulates an incoming DC power before the power is delivered to power said diode(s).

4. The system as recited in claim 2, wherein the output of the comparator is coupled to a secondary winding of a power transformer through a switch, wherein said switch further includes a power transistor.

5. The system as recited in claim 2, wherein said temperature sensor is placed within a predetermined distance to said light emitting diode(s).

6. The system as recited in claim 2, wherein said temperature sensor is a part of said light emitting diode(s).

7. The system as recited in claim 2, wherein said temperature sensor comprises an infrared sensor.

8. The system as recited in claim 2, wherein said reference is generated by a controller.

9. The system as recited in claim 1, wherein said power management system includes a means of communicating with a remote control and adjusting said predetermined value of the temperature.

10. A light emitting diode lighting system comprising:

(a) at least one light emitting diode;

(b) a power supply; and

(c) a power management system that controls difference between an operating temperature of said light emitting diode(s) and an ambient temperature to oscillate around a predetermined value in a predetermined range.

11. The system as recited in claim 10, wherein said power management system further comprises a comparator including a pair of inputs and an output, wherein one input is coupled to an output of a temperature sensor and another input is coupled to a reference, wherein said reference is related to the ambient temperature measured by an ambient temperature sensor.

12. The system as recited in claim 11, wherein the output of the comparator is coupled to a power modulator including a pulse width modulator or a bit stream modulator that modulates an incoming DC power before the power is delivered to power said light emitting diode(s).

13. The system as recited in claim 11, wherein the output of the comparator is coupled to a secondary winding of a power transformer through a switch, wherein said switch further includes a power transistor.

14. The system as recited in claim 11, wherein said temperature sensor is placed within a predetermined distance to said light emitting diode(s).

15. The system as recited in claim 11, wherein said temperature sensor is a part of said light emitting diode(s).

16. The system as recited in claim 11, wherein said temperature sensor comprises an infrared sensor.

17. The system as recited in claim 11, wherein said reference is generated by a controller.

18. The system as recited in claim 10, wherein said power management system includes a means of communicating with a remote control and adjusting said predetermined value of the temperature.

19. A method of operating a lighting system including at least one light emitting diode, the method comprising:

(a) determining operating temperature of the light emitting diode (s) by a controller of the lighting system;

(b) generating a reference as one input of a comparator based upon determined temperature;

(c) forcing the operating temperature of the light emitting diode(s) to oscillate around a predetermined value related to said reference by a thermal feedback loop.

20. The method as recited in claim 19, wherein said method further comprises modulating an incoming power by a pulse width modulator or a bit stream modulator before the power is delivered to power the light emitting diode(s).