Light emitting diode replacement lamp
View Patent ↗Thermal management and control techniques for light emitting diode and other incandescent replacement light technologies using a current controller are disclosed.
1. A method of thermal management of an illumination device comprising a light-emitting diode (LED), the method comprising:
(a) generating a regulated current from a source voltage;
(b) supplying the regulated current to the LED;
(c) generating a sense voltage based on (i) the regulated current and (ii) an LED temperature resulting from heat produced by the LED; and
(d) modifying the regulated current supplied to the LED based on the sense voltage, whereby the LED temperature is maintained within a non-destructive range of LED temperatures.
2. The method of claim 1 , further comprising repeating steps (b)-(d) at least once.
3. The method of claim 1 , wherein generating the sense voltage comprises amplifying at least a portion of the regulated current, an amplitude of the amplification being based on the LED temperature resulting from heat produced by the LED.
4. The method of claim 1 , wherein the LED is disposed on a printed circuit board.
5. The method of claim 1 , further comprising transferring heat away from the LED by at least one of a heat sink or a via in thermal communication with the LED.
6. The method of claim 1 , further comprising dimming the LED.
7. The method of claim 1 , wherein generating the sense voltage comprises flowing at least a portion of the regulated current through a temperature-dependent resistance.
8. The method of claim 7 , wherein the temperature-dependent resistance has a positive temperature coefficient.
9. The method of claim 7 , wherein the temperature-dependent resistance has a negative temperature coefficient.
10. The method of claim 7 , wherein the temperature-dependent resistance comprises a thermistor.
11. The method of claim 7 , wherein the temperature-dependent resistance is disposed in contact with the LED.
12. The method of claim 7 , wherein the temperature-dependent resistance is spaced away from the LED by a thermal pathway comprising air.
13. The method of claim 7 , wherein the temperature-dependent resistance is spaced away from the LED by a thermal pathway comprising a non-air fluid medium.
14. The method of claim 7 , wherein generating the sense voltage comprises flowing a second portion of the regulated current through a resistor connected in parallel to the temperature-dependent resistance.
15. The method of claim 7 , wherein generating the sense voltage comprises flowing a portion of the regulated current through a resistor.
16. The method of claim 7 , wherein the temperature-dependent resistance is (i) disposed on a printed circuit board and (ii) proximate the LED.
17. The method of claim 7 , wherein the LED is disposed on the printed circuit board.
18. A thermal-management system for an illumination device comprising a light-emitting diode (LED), the system comprising:
means for generating a regulated current from a source voltage;
means for supplying the regulated current to the LED;
means for generating a sense voltage based on (i) the regulated current and (ii) an LED temperature resulting from heat produced by the LED; and
means for modifying the regulated current supplied to the LED based on the sense voltage, whereby the LED temperature is maintained within a non-destructive range of LED temperatures.
19. The system of claim 18 , further comprising means for amplifying at least a portion of the regulated current.
20. The system of claim 19 , wherein a gain of the amplifying means depends at least in part on the LED temperature resulting from heat produced by the LED.
21. The system of claim 18 , further comprising a printed circuit board on which the LED is disposed.
22. The system of claim 18 , further comprising means for dimming the LED.
23. The system of claim 18 , further comprising means for transferring heat away from the LED.
24. The system of claim 23 , wherein the means for transferring heat away from the LED comprises at least one of a heat sink or a via in thermal communication with the LED.