Analysis of the heating problem of LED filament lamps

Update:07 Sep 2018
Summary:

LED filament lamp is favored by the majority of industr […]

LED filament lamp is favored by the majority of industrial lighting industry because of its low power consumption, environmental protection, sturdiness and durability, and rich color light source. It has the same size and strong substitution as traditional fluorescent tube. However, the biggest problem in the development of LED filament lamps is heat dissipation. The theoretical service life of LEDs is 100,000 hours at the beginning of the design. However, the heat generated in the work seriously affects the service life of LED filament lamps. Aluminum alloy can conduct heat for the LED tube, but still can not solve the problem of LED heat dissipation. Therefore, LED heat dissipation has become an important problem for LED filament lamps. It is also the biggest cost issue for LED tube.

Heating problems and effects in LED lighting

1. The heating problem of LED lighting

In the process of using LED lighting, especially LED fluorescent tubes, in traditional fluorescent fluorescent tubes, traditional fluorescent fluorescent tubes convert electrical energy into thermal energy and then convert thermal energy into light energy. However, LED fluorescent tubes directly convert electrical energy into electrical energy. Light energy, but the ultimate goal of both is to convert electrical energy into light energy. However, none of the two methods can completely convert electric energy into light energy. At present, the most energy-saving LED fluorescent tube can only convert most of the electric energy (60%~70%) into LED illumination. However, the LED tube is converted into heat during the rest of the lighting process. In addition to the extended use time, the temperature of the LED internal chip will gradually increase, and the performance of the LED internal chip and other devices will decrease or even fail with the temperature rise. Eventually the LED device will not work. Fundamentally, the rise in junction temperature reduces the probability of PN junction luminescence recombination. In the light source, the brightness of the light is reduced, and saturation occurs. Therefore, the problem of heat generation is an issue that needs to be solved in the LED development process, especially the LED daylight tube.

2. LED heating problem affects LED filament light

As mentioned above, the heating problem not only affects the life of the LED device, but also affects the brightness of the light. Experience has shown that the life of LEDs, especially high-power LEDs, depends mainly on the junction temperature of the chip, and the higher the temperature. The lower the reliability, the shorter the working life. Therefore, it is not only necessary to comprehensively design LED devices from the aspects of LED materials, fabrication methods, package structures and illumination principles, but more importantly, to solve the heat dissipation problems existing in LED devices and lamps, to select a suitable package structure, a reasonable heat dissipation method, and Applied to LED lighting.

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