LED Thermal Solution

Thermal Solutions for LED Lighting

At present, the biggest technical problem of LED lighting fixtures is the problem of heat dissipation. The poor heat dissipation leads to the LED driving power supply and electrolytic capacitors, which have become the short board for the further development of LED lighting fixtures, and the reason for the premature aging of LED light sources. After the LED light source is powered on, about 30% of the electrical energy is converted into light energy, and the rest is converted into heat energy. Therefore, it is the key technology of LED lamp structure design to export so much heat energy as soon as possible. The heat energy needs to be dissipated through heat conduction, heat convection and heat sink. Only by exporting heat as soon as possible can the cavity temperature in the LED lamp be effectively reduced, the power supply can be protected from working in a long-lasting high-temperature environment, and the premature aging of the LED light source due to long-term high-temperature operation can be avoided.

Because the LED light source itself has no infrared and ultraviolet rays, the LED light source itself has no heat sink heat dissipation function. The heat sink must have the functions of heat conduction, heat convection and radiation.

Any heat sink, in addition to being able to quickly conduct heat from the heat source to the surface of the radiation, mainly relies on convection and radiation to dissipate heat into the air. Heat conduction only solves the way of heat transfer, while heat convection is the main function of the radiator. The heat dissipation performance is mainly determined by the heat dissipation area, shape, and the ability of natural convection strength. Heat radiation is only an auxiliary role.

Commonly used LED heat sink generally have extrusion heat sink, heat pipe heat sink, die-cast heat sink, etc. The material and shape or process of the heat sink are defined based on the LED thermal power.