Positive temperature coefficient light emitting diode light
View Patent ↗An apparatus includes electrical contacts coupled to a LED. The apparatus further includes a positive temperature coefficient resistor in operative thermal communication and electrically in series with the LED. A resistance of the PTC resistor varies as a function of a temperature of the LED.
1. An apparatus comprising:
at least one LED powered by a non-linear electrical power having power fluctuations;
a substrate comprised of a thermally conductive material, wherein the at least one LED is mounted to a first surface of the substrate;
a temperature-based controller mounted to a second surface of the substrate and electrically coupled to the at least one LED that mitigates the power fluctuations of the non-linear electrical power to cause the LED to provide a relatively constant light output; and
an insulator proximate to surfaces of the temperature-based controller that reduces the influence of ambient temperature on the temperature-based controller.
2. The apparatus of claim 1 , further including a battery receiving region that receives a battery that provides the electrical power for the LED.
3. The apparatus of claim 1 , wherein an increase in the resistance of the temperature coefficient resistor decreases a forward current of the LED.
4. The apparatus of claim 1 , wherein the temperature-based controller is a polymeric positive temperature coefficient (PPTC) resistor.
5. The apparatus of claim 1 , further including a battery receiving region that selectively receives one of a primary and a secondary battery that provide power for illuminating the LED.
6. The apparatus of claim 1 , wherein the LED is a white LED.
7. The apparatus of claim 1 , wherein the apparatus is a domestic lamp.