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What are the ways to improve the heat dissipation efficiency of LED explosion-proof lamps

Datetime: 2021-03-12 08:50:34

With the development of LED lighting technology, LED explosion-proof lamps have entered the general lighting market. However, the development of LED explosion-proof lamp lighting system has received a great influence on the heat dissipation problem. For example: First, in order to increase the luminous flux of a single tube, inject a larger current density, as mentioned below, so that the chip generates more heat and needs to be dissipated. Second, the new packaging structure. As the power of the LED light source increases, multiple power LED chips need to be packaged together, such as COB structures, modular lamps, etc., which will generate more heat and require more effective heat dissipation structures and Measures.

1. The cause of LED heat and the influence of heat on LED performance:

Under the forward voltage of the LED, electrons obtain energy from the power supply. Under the drive of the electric field, they overcome the electric field of the PN junction and transition from the N region to the P region. These electrons recombine with the holes in the P region. Since the free electrons drifting to the P zone have higher energy than the valence electrons in the P zone, the electrons return to a low-energy state during recombination, and the excess energy is released in the form of photons. However, only 30% to 40% of the released photons are converted into light energy, and the remaining 60% to 70% are converted into heat energy in the form of point vibration.

Since LEDs are semiconductor light-emitting devices, and semiconductor devices themselves change with temperature changes, their inherent characteristics will change significantly. The increase in the junction temperature of the LED will cause the change and attenuation of the device performance. This change is mainly reflected in the following three aspects: (1) Reduce the external quantum efficiency of the LED; (2) Shorten the life of the LED; (3) The main wavelength of the light emitted by the LED is shifted, which causes the color of the light source to shift. High-power LEDs generally use more than 1W of electrical power input, which generates a lot of heat, and it is an urgent task to solve the heat dissipation problem.

2. Several suggestions for improving heat dissipation water products:

1. From the perspective of LED chips, new structures and new processes should be adopted to improve the heat resistance of the junction temperature of the LED chip and the heat resistance of other materials, which reduces the requirements for heat dissipation conditions.

2. Reduce the thermal resistance of LED devices, adopt new packaging structures and new processes, and select new materials with better thermal conductivity and heat resistance, including bonding materials between metals, phosphor mixtures, etc., so that thermal resistance 10 /W or lower.

3. Reduce the temperature rise, try to use heat dissipation materials with good thermal conductivity, and require better ventilation channels in the design to dissipate the residual heat as soon as possible, and the temperature rise should be less than 30°C