LED lamp bulb fever how to do?
Leds are produces heat, a lot of people will think the LED cold light source, it only refers to the LED light-emitting principle.
LED lamp bulb: LED lamp bulb fever because all power did not join into light energy, but rather part of converted to heat, electro-optic conversion efficiency about 20 ~ 30%.
That is to say, about 70% of the electrical energy into heat energy.
Specifically, the generation of the LED junction temperature is caused by two factors: external produce all photons cannot penetrate into the chip internal and finally converted to heat, this part is mainly, because the current is called external quantum efficiency is only 30%, mostly is converted into heat.
Internal quantum efficiency is not high, that is, when electrons and holes compound, and cannot be 100% produces photons, which is usually called by the current leakage and lower the PN area carrier recombination rate.
Leakage current is multiplied by the voltage, the power of this part is converted into heat energy, but it does not occupy a main component part, because now the internal efficiency of photon is close to 90%.
As previously mentioned, although incandescent light efficiency is very low, only about 151 m/W, but it will be almost all electric energy into light energy and radiation, because most of the radiant energy is infrared, so the light efficiency is very low, but from the heat dissipation problem.
LED lamp bulb cooling solution: solve the heat dissipation of LED lights, mainly from two aspects, encapsulation before and after the packaging, can be understood as the LED chip cooling heat dissipation and LED bulb.
LED chip cooling is mainly related to substrate and selection and process of the circuit, temporarily not elaborated in this paper.
This paper mainly introduces the heat dissipation of LED lights, because made any LED lamps and lanterns, so the heat generated by the LED chip is always through the shell of lamps and lanterns are scattered into the air.
Grey rain, lighting lighting think if heat dissipation is not good, because the LED chip thermal capacity is small, a little heat accumulation will make the chip junction temperature increase rapidly, if long time work in the condition of high temperature, it would quickly shorten service life.
However the quantity of heat to be able to lead to real chips to the outside air, go through many ways.
In particular, the heat produced in the LED chip, from metal heat block it out, first through to the aluminum substrate PCB solder, again through the heat conduction glue to the aluminum radiator.
So actually LED hotel engineering lamps and lanterns, heat dissipation includes heat conduction and heat dissipation of two parts.
However the LED lamp shell heat according to the power size and the use place, also can have different choices.
Now basically has the following several kinds of cooling methods: aluminum radiator fins: this is the most common way of heat dissipation, use aluminum radiator fins as a part of the shell to increase the cooling area.
Internal reinforced with long life high efficiency fan cooling fan lamp shell: low cost, good effect.
Fan is trouble some, but want to change also does not apply to outdoor, this design is relatively rare.
Thermal conductive plastic case: when plastic shell injection molding filling thermal conductive materials, increase the plastic shell heat conduction and heat capacity.
Heat pipe radiator technology: the heat conducting pipe using heat pipe technology, heat from the LED chip guide to shell the cooling fins.
In the large lamps and lanterns, this is a common design such as lamps.
Air cooling fluid mechanics: air fluid mechanics using the lamp shell shape, create convection air, this is the lowest cost to strengthen the cooling way.
Surface radiation heat treatment lamp shell surface radiation heat treatment: simple is daub radiation coating, can be taken away from the lamp shell surface heat radiation way.