Reduce the temperature rise and temperature high-power LED light technology research

Environmental issues in national economic development has become issues of prime importance, which led lighting energy saving lighting has become the world's "favorite." LED luminous efficiency because the higher and lower manufacturing costs, its prospects and the market is very large. However, the high power LED lamp heat problems limited the development of LED lighting industry, thermal issues are not addressed, will increase the temperature of the LED light, resulting in lower luminous efficiency of its service life shortened. In this paper, the design of lamps and drive two aspects to lower the temperature rise of high-power LED lights and temperature control methods and techniques to effectively reduce and limit the temperature rise of high-power LED lights.
A lower temperature
Currently, LED lamps are the natural convection heat dissipation cooling, install the fan forced cooling, heat pipes and loop heat pipe and so on.
1.1 separation of power and light body
As the power supply itself must be the heat, making the LED light on the heat source increases. At the same time, power and light one LED light design makes the overall heat unevenly, these factors can lead to fatigue and early lamp failure, which might affect their life.
1.2 the choice of quality LED module
LED module on the choice of reducing the temperature also plays a more crucial role. Choose from the high thermal conductivity and consistent material encapsulated LED lamp beads, can improve the internal thermal diffusion. High thermal conductivity and high heat substrate for the metal wick plate so that the heat sink temperature distribution, making the heat sink to maximize.
1.3 increase heat dissipation area
Aluminum plate and fin likely to have gaps at the interface, and the air thermal conductivity is very small, only about 0.03W / m · K, it can be painted in contact with high heat capacity of the gel to increase the thermal grease the actual contact area. At the same time, increasing the heat sink cooling area, the structural deformation of the heat sink to facilitate heat dissipation.
2 temperature control system
LED lamp with rated power than the heat generated by its cooling capacity, this heat but also in strengthening the use of temperature control technology to limit the temperature rise. High temperature, the temperature control system to work, appropriate to reduce the drive's output reached the limit and reduce the temperature of purpose; when the temperature is lowered, to restore the original working condition. Select the text of the following two ways to drive the LED lights.
2.1 Constant Current Driver
This program by controlling the output current drive to achieve temperature control of LED lights. Figure 2 shows the constant current driver with LED lights diagram, the drive output to the LED module, LED module on the heat conduction through the good thermal conductivity material to wick plate, and finally through the heat sink heat into the atmosphere. When the external thermal environment, bad time, LED module temperature will reach a temperature control system, set the temperature feedback information, the drive to reduce output, the limit is reached and the LED module temperature.
2.2 constant voltage drive
This program by controlling the output voltage of the drive to achieve control of the LED lights. Similar to the overall framework and constant current drive, the difference is, the program uses constant drive and temperature control system circuit is different.
3 trial drive the measured results
This study was high-power LED lights and LED lights, and drive the development work. Figure 8 for the LED street lights and the constant current drive-like, light body with integrated design, the measured temperature of the AC input drive current of 270mA, light long-running in good condition, the total flux 3408lm, the role of temperature, output current is reduced to 87% at room temperature. Figure 9 LED lights like light and constant voltage drive, measured at room temperature, the AC input drive current of 140mA, the total flux of 1011lm, the role of temperature, voltage reduced to 90% at room temperature.
This above-mentioned program, effectively reducing the temperature rise of high-power LED lights, once the temperature exceeds the control temperature, makes the drive to reduce output, without affecting the use of the case, the appropriate LED lights to reduce the luminous flux and power consumption to avoid overheating due to the LED lighting failure and shortened life. The temperature control program in the course of the study showed many advantages, I believe that in the near future will be large-scale practical applications, LED lighting will therefore be a greater degree of improvement.
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