A Study Of The Cooling Technology On High Power LED

The high power LED(light emitting diode) is widely used for its advantages, such as high electricity-light transformation efficiency, long life span, enviroment protection, ecnomy, high light color, little volume and so on. But the enviroment temperature and the temperature resistance between the juncton to the enviroment have a great effect on the electricity-light transformation efficiency and life span, thus the high efficiency stable cooling problem is in the way of applying high 1ED widely. In this paper, the cooling of the high power of the LED is researched by experiment and numerical simulation, the main research results are as follows:1. According to the structure and working condition of the high power of the LED, a test bench was set up, which consist of a constant temperature room and a constant temperature plate, the temperature and the power dissipation of the LED was measured. Based on SCM,the software such as Proteus, KeilC and Prote1199SE were used to design, simulink and make a two-level control system, and the system was used to control the temperature of the const temperature room and the temperature of the const temperature of the plate. As many pooint of the fins and the const temperature roon were needed to be measured of the temperature, a multichannel temperature measure system was made in order to verify the temperature of the temperature of the constant temperature room, the temperature measure system was based on the AT89S52, DS18B20, VB, RS-232 Communication Protocol.2. With the fluid numerical simulation technology, high power LED fins was considered as model to research the temperature field and the fluid field, both the results came from the compational simulation and the experimental study are compatibility with each other. The results reveals that the cooling effect is enchanced by the drilling hole at the bottom of the fins; the outside faces of the fins have a better cooling effect and the air velocity near the outside faces is larger; the inside faces of the fins have a worse cooling effect and the air velocity near the inside faces is little, the temperature attribute on the fins are generally even, which is close to the temperature of the constant temperature plate. The analysis of the computational simulation gives a reference on the optimization of the design of the LED heat exchanger and the improvement of the test bench.3.according to the results come from the computational simulation and the experimental study, the main issue that affect heat transfer was analysised, and according to the system of the test bench and the simulation results, the disadvange of the temperature measurement of the research bench was analysised and some improvement of the research bench was raised.