Tong Yuzhen: application of heat conduction in LED street lamp cooling system

Peking University wide bandgap semiconductor research associate professor Tong Yuzhen, PhD in psychology in the "municipal energy-saving lighting products and technology exchange" was titled "heat conduction in the LED street lamp heat dissipation system of the application of" report.

This paper mainly introduces the influence of heat on LED, the application of LED thermal resistance and the heat channel, the heat pipe in the LED street lamp, the optimization of the heat dissipation of the LED tube, and the further research of the heat pipe cooling technology.

In the heat of the impact of LED, report pointed out: the influence of thermal performance and package structure of LED junction temperature Tj, LED LED; thermal luminescence efficiency; effect of heat on the optical channel; effects of heat on the transmittance, refractive index, spatial light distribution; thermal LED channel (ohmic contact touch / solid crystal interface) effect etc..

The report describes the Hong Bao LED street lamp has the following characteristics:

1 the high thermal conductivity of the light metal material, the whole lamp shell of the whole stretch forming, change the traditional die-casting aluminum lamp structure, good thermal conductivity.

2 heat pipe to ensure that the junction temperature of less than 80 degrees. And the light source radiator and lamp fixed together, the heat conduction directly on the lamp body, the lamp into a large radiator.

3 using the stack effect to heat the heat, in the shell above the hole multiple heat, is a professional lighting design characteristics of LED light source.

4 the appearance of the traditional street lamp has a landscape effect, more easily accepted by the people, the level of technical research and development requirements, but the production process is simple, the user can install and replace their own accessories, easy installation and maintenance.

5 using series parallel connection method to solve the high power (10W-50W) light source coherence technology, small size.

6 lamps for free-form surface lens optical design, the light distribution in uniform irradiation within the scope of the effective, improve the uniformity, avoid the emergence of glare.

7 intelligent drive circuit, according to the time regulation and control of the current, more energy saving, can effectively release static electricity, lightning, and the realization of power off current protection, effectively provide product safety and reliability.

The 8 type water tank and aging resistant silicone seal, waterproof properties is good; for solar and wind power interface, can realize power, solar and wind energy complementary.