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Energy saving and Heat exchange
Energy saving and Heat exchange

Optimization of a light-emitting diode source

A patent application for an invention is filed and tests of a light-emitting diode source have been carried out with a breadboard model -15. The test results have shown the possibility of a more than 3-fold reduction of the heat-sink height, the luminous efficiency remaining the same and the light-emitting diode temperature being decreased.

On the basis of said patent application for an invention, it is possible to manufacture light-emitting diode sources having a lower heat-sink height but a higher luminous efficiency due to the distribution of a higher number of light-emitting diodes on a considered surface area. Our technology enables, in the production of car headlights, searchlights, street lamps, etc., to get a necessary luminous flux with a guaranteed cooling of the light-emitting diodes, to provide a multifold increase of the light-emitting diode operating life, to reduce their overall size.

Rather promising is the increase of the light-emitting diode source operating life and the reduction of their weight thanks to the light-emitting diode cooling achieved with a Peltier thermoelectric module the optimum current of which is equal to the nominal current of the light emitters that are connected in series to the same, according to a patent application (filed in Russia, an international patent application for an invention (PCT) is presently prepared for filing). Openings for placing light-emitting diodes and a diagram for connecting the same are arranged on the outer surface of the cold side of a Peltier thermoelectric module in the process of manufacture. Such a light-emitting diode connection (the light-emitting diode manufacturer is the Cree company, the model XP-E is used in two compared specimens) to a Peltier thermoelectric module with the use of a laboratory specimen of the light-emitting diode source -15 (while the Peltier thermoelectric module was not current-optimized on the light-emitting diode source -15) resulted in a decrease of the heat-sink height from 50 mm to 15 mm and in the temperature drop from 75°С tо 66°С at the immediate vicinity of the light-emitting diodes, the current flux in the last being maintained, the ambient temperature being of 26°С and the lens being removed (The light-emitting diode source -15 was manufactured under laboratory conditions, and the industrial production technology shall improve the temperature index at the immediate vicinity of the light-emitting diode). Sheet No 1 shows a light-emitting diode source -50 (a comparison object) and sheet No 2 shows a light-emitting diode source -15 manufactured according to our patent application for an invention (filed in Russia, an international patent application for an invention (PCT) is presently prepared for filing). When keeping the height of the heat exchanger heat-sink, the operating life of the light-emitting diode source shall multiply since the temperature at the immediate vicinity of the light-emitting diodes will considerably drop, a higher current shall increase the luminous efficiency (the light-emitting diode temperature will not exceed recommended values given in the operating specifications). Replacement of currently widely used ribbed, rod-like, flanged and other heat exchanger heat-sinks, by flanged loop heat exchanger heat-sinks we have developed, according to an application for an invention (filed in Russia, an international patent application for an invention (PCT) is presently prepared for filing), will enable to additionally increase by 2 – 3 times the mass and volume characteristics or to reduce the temperature at the immediate vicinity of the light-emitting diodes, which shall increase the operating life of the light-emitting diode sources.

Энергосбережение и теплообмен

Pic. 1. LED source-15

Энергосбережение и теплообмен

Pic. 2. LED source-50