LED and all electronic parts in general, in the use or operation of the process will produce heat and temperature rise phenomenon, if you ignore the heat problem, will lead to LED due to high temperature and early burned the results. LED lighting design is more complex than traditional lighting, including optical, mechanical, electronic and heat, which "heat" is particularly important, because the current high-power LED lamps at work with most of the conversion of energy into heat, if the heat can not be exported , Will not be able to achieve the LED light source declared 50,000 hours of life, while the heat will affect the LEDluminous efficiency, leading to serious light failure and lamp damage.
LED luminous efficiency and life and temperature is closely related，As the development of high-power LED technology, LED lamps face thermal management and thermal design of the harsh challenges, because the temperature will not only cause the decline in brightness, when the temperature exceeds 100 degrees Celsius will accelerate the lamp body and packaging materials degradation The Therefore, in addition to LED packaging components of their own cooling technology, the LED plant lamp cooling and thermal design is to maintain the life of LED lighting the biggest key.
In the lighting design, by the LED chip, LED chip substrate, chip package, line design, system circuit board, cooling fins to the lamp shell and then all test the LED industry, the downstream research and development capabilities. Cooling system can be divided into active cooling and passive cooling, active cooling, including fan forced cooling and magnetic jet cooling, passive cooling, including natural convection cooling, heat pipe heat dissipation, the next will be a brief introduction:
1. fan forced cooling:
Fan forced cooling As the name suggests is generated by the air convection fan, the hot air out of the lamp body to the outside heat, the use of fan forced cooling can be very effective in the heat discharge, in the computer, air conditioning and cars are forced to heat the fan. LED plant lights in the design should be based on the actual situation to determine the number of fans, as long as there is a good cooling effect, the number of fans is naturally the less the better, because the increase in the number of fans, the cost of the entire lamp and power consumption increase.
2. Electromagnetic jet heat dissipation:
Electromagnetic jet heat does not use fan blades to produce airflow, which is structured as a hollow cavity with a film that oscillates the film at an electrical frequency of 100 to 200 times per second using an electromagnetic or piezoelectric actuator to cause the film to oscillate up and down. The air will flow up and down, the air will flow into the hollow cavity and then ejected, after the air flow will drive the surrounding air vortex phenomenon, and strengthen the air convection capacity, has been used in LED bulb manufacturing.
3. Natural convection cooling:
Natural convection heat is through the radiator (such as: cooling fins, lamp shell, system board, etc.) and air direct contact, the radiator around the air due to heat absorption into hot air, then hot air up, cold air , Naturally will lead to air convection, to achieve the effect of cooling. With the introduction of high-power lighting products, the use of natural convection cooling need to have a large heat dissipation surface area, so the heat fins in response to the majority, installed in the back of the lamp to provide a larger cooling area, to strengthen the effect of convection cooling, the current LED plant lamp industry is the most widely used one.
4. Heat pipe heat dissipation
When the heat from the evaporator to the working fluid within the loop heat pipe, the working medium absorbs heat and evaporates to the condenser, releases heat and condenses, and then returns to the evaporator by the capillary force of the porous material in the evaporator. The effect of loop cooling is beyond doubt, due to the high cost and volume constraints are not used by the LED plant light industry.
Can be learned from the LED plant lights in the heat problem to solve nothing less than the thickness of the heat carrier to increase the cooling area and increase the number of cooling fans. The thickness of the heat carrier should also be based on the actual temperature of the lamp work, increase the thickness of the carrier although it can store more heat, but will affect the speed of its heat dissipation, LED plant lights will also have a slight impact on the shape and cost. Natural convection requires a large cooling area, then how to LED plant lamp cooling area to maximize it. The traditional approach is to increase the cooling fins (commonly known as heat dissipation profiles), the use of cooling fins, although the increase in heat dissipation, but also increased the overall weight and cost of LED plant growth lights, in addition, LED lamps are often faced with dust accumulation and other issues, Long use, too much dirt, dust accumulation will plug the cooling system. If not timely cleaning, will seriously affect the cooling effect of lamps.
So the best design is the shell and the radiator body forming, so that the maximum heat dissipation area, but also to promote the radi body and air direct contact with the area to maximize the speed of hot and cold conduction, the Olympic International YOUTHS series of LED plant lights used Is this technology, the other YOYTHS series of LED plant lights using the original hot and cold air duct isolation system, follow the natural law of air convection, so that its thermal performance even more powerful. And then configure the efficient mute fan forced cooling, so that the entire LED plant lamp cooling effect to a higher level.
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