LED bulbs fever causes and solutions
LED bulb fever how to do? LED is the heat will happen, many people will think the LED cold light source, it only refers to the LED light-emitting principle.
LED bulb fever:
LED bulb fever is due for electricity and not all into light, but part of converted to heat, electro-optical transformation about 20 ~ 30% power. Also is said about 70% of the electrical energy into heat energy.
in particular, the occurrence of the LED junction temperature is caused by two factors:
internal quantum power is not high, also is in the composite, the electrons and holes is not 100% occurred photons, generally called by & other; Current leakage & throughout; And make the PN area carrier recombination rate of decline. Let the cat out of the current times the voltage is that part of the power, also is converted into heat energy, but this section does not account for the first ingredient, now due to the internal photon power is now close to 90%.
all photons cannot penetrate to the chip inside outside and finally converted to heat, this part is the first, because the current is called external quantum power as long as about 30%, mostly is converted into heat.
as previously mentioned, although incandescent light efficiency is very low, as long as 15 lm/W, but it will be all the electrical energy into light energy and radiation, as most of the radiant energy is infrared, so the light efficiency is very low, but is exempt from the heat dissipation problem.
LED bulb heat treatment method:
deal with LED bulb heat dissipation, from two aspects, the first package before and after packaging, can understand for the LED chip cooling heat dissipation and LED bulb. LED chip cooling first related to substrate and selection and process of the circuit, temporarily not elaborated in this paper. This paper first introduces the LED bulb heat, will be made for any LED lamps and lanterns, so the LED chip heat that had happened in the end the through the shell of lamps and lanterns are scattered into the air. Surveying of land lighting thought if heat dissipation is bad, because the LED chip thermal capacity is small, a little heat accumulation chip junction WenMinJie will increase if long time work in high temperature condition, it would quickly shorten service life. However the quantity of heat to be able to lead to real chips arrived in outside air to go through many ways. Specifically, what happens to the LED chip heat, from the metal heat block it out, first through to the aluminum substrate PCB solder, and then to the aluminum radiator came after thermal conductive adhesive. So actually LED hotel engineering lamps and lanterns, heat dissipation includes heat conduction and heat dissipation of two parts.
however, LED lamp shell heat according to the power range and use place, also can have different selection. Now first have the following several kinds of cooling way:
aluminum radiator fins: this is the most common cooling method, using aluminum radiator fins as part of the shell to add the cooling area.
thermal conductive plastic shell, when the plastic shell injection molding filling thermal conductive materials, thermal conductivity, heat dissipation can add plastic shells.
air cooling fluid mechanics, fluid mechanics using air lamp shell shape, create convection air, this is the minimum capital to strengthen the cooling method.
fan lamp shell internal reinforced with long life high efficiency fan cooling: low cost, good effect. Electric fan is trouble some, but want to change also does not apply to outdoor, this design is relatively rare.
heat pipe radiator skills: heat pipe using thermal tube skills, 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.
looks radiation heat treatment lamp shell they do radiation heat treatment: simple is daub radiation coatings, heat radiation method will bring it from the lamp shell appearance.