Question

How to avoid/reduce heat for three 1W LED's?

Answer 1

To avoid or reduce the heat of three 1W LEDs, we can start from the following aspects:

I. Optimize LED chip design

Improve internal quantum efficiency: reduce the "current leakage" when electrons and holes recombine, thereby increasing the recombination rate of carriers in the PN region and reducing the heat energy generated by current leakage.

Improve external quantum efficiency: increase the proportion of photons generated internally emitted to the outside of the chip and reduce the number of photons converted into heat. Although it is difficult to significantly increase the external quantum efficiency to nearly 100%, any slight increase will help reduce heat.

II. Improve heat dissipation design

1. Use efficient heat sinks

Aluminum heat sink fins: Use aluminum heat sink fins as part of the LED lamp housing to increase the heat dissipation area to improve heat dissipation efficiency.

Heat conductive plastic shell: Fill the plastic shell with heat conductive material during injection molding to enhance the heat conduction and heat dissipation capabilities of the plastic shell.

2. Use advanced heat dissipation technology

Heat pipe technology: Use heat pipes to effectively conduct the heat generated by the LED chip to the shell heat sink fins to further improve the heat dissipation efficiency.
Surface radiation heat dissipation treatment: Perform radiation heat dissipation treatment on the surface of the lamp housing, such as applying radiation heat dissipation paint to remove heat from the surface of the lamp housing by radiation.

3. Optimize heat dissipation structure

Application of air fluid mechanics: By optimizing the shape design of the lamp housing, the principle of air fluid mechanics is used to create convection air to enhance the heat dissipation effect.
Fan heat dissipation: Install high-efficiency fans inside LED lamps to improve the heat dissipation effect through forced convection of the fans. However, it should be noted that the use of fans may increase costs and noise, and is not suitable for all environments (such as outdoor environments).

III. Control the working environment

Maintain a suitable working temperature: Try to avoid placing LED lamps in high temperature or closed environments to reduce the impact of ambient temperature on LED heating.
Avoid overload use: Ensure that LED lamps work within the rated power range to avoid overload use resulting in increased heat generation.

IV. Choose high-quality LED products

Choose well-known brands: Well-known brands usually have stricter quality control standards and more advanced production technologies, and their LED products have relatively low heat generation.
Check product parameters: When purchasing LED products, pay attention to key parameters such as electro-optical conversion efficiency and heat dissipation design, and choose products with better performance.

In summary, the heating problem of three 1W LEDs can be effectively avoided or reduced by optimizing LED chip design, improving heat dissipation design, controlling the working environment, and selecting high-quality LED products.

Answer 2

The reasons for the heating of 1W LED mainly include two aspects:

1. Efficiency of LED particles themselves: When LED is working, not all electrical energy is converted into light energy, and about 70% of the electrical energy is converted into heat energy.

This is because the internal quantum efficiency of LED is not 100%, and the generated photons cannot all be emitted outside the chip, resulting in most of the energy being lost in the form of heat energy.

2. Conversion efficiency of LED drive circuit: LED requires a drive circuit to convert AC power into a low-voltage constant current drive.

If the conversion efficiency of the drive circuit is not high, such as only 50%, the input power is much greater than the power required for the actual operation of the LED particles, and the remaining power will also be dissipated in the form of heat.

In summary, the heating of 1W LED is caused by the efficiency of LED particles themselves and the conversion efficiency of the drive circuit.

In order to improve the energy efficiency of LED and reduce the heat, it is necessary to continuously improve LED chip technology and optimize the drive circuit design.