The importance of heat dissipation to LEDs?


Is heat dissipation important to LEDs?

In terms of temperature, LEDs are often referred to as "cold" light sources. This is because the spectral output of LEDs used for lighting does not contain infrared radiation, which is different from incandescent lamps that produce a lot of infrared light (of course, some LEDs used for manufacturing purposes are designed to produce infrared energy, but in this publication These energies are not considered)). LEDs are also generally considered "cold" because they emit light through mechanisms other than the thermal excitation of substances (such as tungsten filaments in incandescent lamps). Although the LED lighting system does not generate a lot of radiant heat, the LED still generates heat in the junction, which must be dissipated by convection and conduction. Use the following methods to absorb heat from the radiator of the device and to achieve higher light output and longer device life by operating the LED at a lower ambient temperature.

In one embodiment, an LED lamp includes: a heat sink including a row of exposed fins on one surface; and a conductive member opposite to the fin, the conductive member including two electrically connected Side positive electrode, one or more negative electrodes separated from the positive electrode and spaced apart between the positive electrode, and one or more conductive positioning strips each between the negative electrode and the positive electrode; a light-emitting array mounted on the conductive The components include rows of LEDs. These LEDs are divided into groups connected in parallel. The LEDs of each group are electrically connected in series. Each LED includes positive and negative leads fixed to a conductive positioning bar and electrically connected to any positive electrode. The foot electrode and the negative electrode, the positive electrode conductor, are electrically connected to any positive electrode; the negative electrode is electrically connected to the negative electrode.

When installing these systems in applications, the need to ensure the heat dissipation of the LED system is also important. There must be sufficient means to conduct heat away from the system, or to ventilate through convection to cool the heated surface. Placing the LED lighting system in an insulated and relatively small space may cause a rapid rise in junction temperature and poor performance.