Thermal Management in LED Lighting

A good dissipation of the heat is essential to guarantee the duration and the correct operation of the lamps LED.

After understanding the importance of the driver or power supply for operation and durability , it is vital to understand the importance of the thermal management of LED lighting.

It first that there is that clarify is that the LED lighting generate heat, little compared with other types of technologies, but due to them chips installed if radiate heat. The fundamental difference between LED lights respects to technologies incandescent or fluorescent is that the heat is projected in direction contrary to the light. That heat can affect certain parts of the LED lighting and its management is vital to the performance and durability of the LED lighting.

He called “effect Joule” is the guilty of the generation of heat in the lighting LED. DC-powered LEDs (CC) and for it to work on our installations running in draughty alternate (CA) require the use of a driver. In this process the current passes through the part behind the chip of the LED lighting, the so-called point or T-joint. He control thermal of of this point, is it key to determine the quality and durability of the product LED, an excess of heat in that point would reduce drastically the life useful and affect the quality of the light emitid.

A good heat dissipation avoids the luminaires to suffer:

  • Reduces the durability of the lamp, degrading their match
  • Reduces the range of temperature environmental to which can operate
  • Alteration of colors and less light intensity

Comparison of conversion of energy to heat / light between technologies of lighting

  Generated light heat generated IR radiation generated
Led 70-80% 20-30% 0%
Fluorescent 20% 40% 40%
Incandescent 10% 20% 70%

The exclusive features of them LED, make that are them more appropriate for the installation in environments cold as cameras stores or stores of products fresh. Also contribute to reduce the costs of air conditioning and minimize those risks both for them people as them equipment. The LEDs always work best at low temperatures. To lower temperature, better performance.

How is dissipation of the heat of the lights?

  1. The electric flow generates heat and this accumulates at the junction of the chip
  2. From the point of union of the chip heat is transferred to the base plate
  3. Since the plate it is transmitted to the heat sink
  4. Of the sink is removed the heat to the environment

 

Base plate
The level of finish in the welding of plates of LED luminaires, is vital for proper heat dissipation and avoid excessive temperature rise. The direct binding of the chips to the motherboard by soldering them to the circuit board, dissipates heat up to 100 times better.

Union T
The union between the chip and motherboard is what we call union T. Them connections between the drivers and the terminals of them devices influence also of way very important in the treatment of the temperature.

Heatsink of heat (heat sink)
Normally the heatsink of heat tends to have form of structure metal (grooves or flaps) that will help to manage the temperature. They tend not to be visible and in light-duty fixtures are generally not necessary. In light fixtures very powerful as them of use industrial are absolutely necessary for the correct operation to temperatures of environment high.

 

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