Household 100 w solar light

1, what is a high power LED lamps and lanterns of junction temperature of junction temperature? High power LED lamps and lanterns is the basic structure of a semiconductor junction temperature of P - N junction. Test point out that when a current flows through the high power LED lamps and lanterns junction temperature components, P - N junction temperature will rise, technically,



1, what is a high power LED lamps and lanterns' High power LED lamps and lanterns is one of the LED bulbs, relative to small power LED energy-saving lamps, high-power LED bulbs single star power, higher brightness is more bright, the price is higher. 】 The junction temperature The junction temperature ( 结温) Is in the electronic equipment in the real semiconductor chips ( Wafer, bare chip) In the PN junction temperature. 】 The junction temperature? High power LED lamps and lanterns is the basic structure of a semiconductor junction temperature of P - N junction. Test point out that when a current flows through the high power LED lamps and lanterns junction temperature components, P - N junction temperature will rise, strict sense, the P - N junction zone temperature is defined as a high power LED lamps and lanterns of junction temperature of junction temperature. Usually because of circuit chips have very small size, so we can put the temperature of high power LED lamps and lanterns knot WenXin piece for the junction temperature. 2, high power LED lamps and lanterns of junction temperature junction temperature causes have? In junction temperature of high power LED lamps and lanterns is working, but the presence of the following five kinds of LED junction temperature of different level rise: a, bad element electrode structure, window substrate structure or the materials and conductive silver glue' Conductive silver glue, it is generally thought that the main, through the matrix resin adhesive effect of the conductive particles together, form a conductive path, realize the electrical connection glued materials. 】 All has certain resistance, the resistance base with each other, constitute the high power LED lamps and lanterns series resistance of the junction temperature element. When current flows through the P - N junction, also flows through the resistor, resulting in a joule heat, the temperature or the rise of junction temperature caused by chip. B, due to the P - N junction can't extremely perfect, components of people will not reach 100% efficiency, also that said, while working in junction temperature of high power LED lamps and lanterns in addition to the P to N area charge injection ( Hole) To a P, N area will also note the charge ( Electronic) , under normal circumstances, the kind of charge after the one who is, won't produce the photoelectric effect, and consumed in the form of heat. Even if the useful part of the injected charge, also won't all become light, some of defects or precipitates and the junction area, the combination of will eventually become hot. C, the practice has proved, and the light efficiency limit is leading to high power LED lamps and lanterns is the main reason for the junction temperature and high temperature. At present, the advanced material growth and device fabrication processes have been able to make high power LED lamps and lanterns of junction temperature most input energy converted to optical radiation can, however, because of the high power LED lamps and lanterns knot WenXin material compared to the surrounding media, has a much larger refractive index, causing great part of the chip internally generated photons ( > 90%) Cannot smoothly overflow interface, and in total reflection and medium interface chip, the returned chip internal and through the multiple internal reflection eventually absorbed by chip material or substrate, and become hot, in the form of lattice vibration led junction temperature is high. D, obviously, the high power LED lamps and lanterns of junction temperature components heat dissipating capacity is another key conditions of junction temperature. Heat dissipation capability is strong, the junction temperature drop, on the contrary, when the heat capacity difference junction temperature will rise. Because epoxy adhesive is low thermal conductivity material, P - N junction in the heat generated by the hard to through the transparent epoxy upward to the environment, most of the heat through the substrate, silver paste, shell and epoxy adhesive layer, the PCB and heat sink down. Obviously, the ability will directly affect the components of thermal conductivity of materials related to the heat loss of efficiency. A normal junction temperature of high power LED lamps and lanterns, from P - N junction region of the total thermal resistance of the environment temperature between 300 to 600 ℃ / w, for a power type high power LED lamps and lanterns with good structure junction temperature components, the total thermal resistance is about 15 to 30 ℃ / w. Dramatic difference between the thermal resistance that ordinary high power LED lamps and lanterns of junction temperature components can only under the condition of small power input, can work normally, the type and power dissipation power of components can be big to tile level or higher. 3, to reduce the high power LED lamps and lanterns of junction temperature of junction temperature way have? A, reduce the high power LED lamps and lanterns of junction temperature itself thermal resistance; B, good secondary cooling mechanism; C, reduce the high power LED lamps and lanterns of junction temperature and secondary cooling installation interface between thermal resistance; D, control the rated power input; E, to reduce the environmental temperature of high power LED lamps and lanterns of junction temperature of the input power is the only source of heating element, part of the energy into the radiation energy, the rest are eventually became hot, thus elevating the temperature of components. Obviously, reduce the high power LED lamps and lanterns '[effect rise of the main methods, one is trying to improve the components of electro-optical conversion efficiency ( Also known as the external quantum efficiency) , make the power input into light energy as much as possible, another important way is to try to improve the heat dissipating capacity of components, the heat generated in the junction temperature, through various channels to send out into the surrounding environment.