LED fever because all power did not join in, but a part is converted into heat energy, LED the luminous efficacy at present only 100 lm/W, its electro-optical conversion effect only about 20 -
About 30%, that is to say, about 70% of the electrical energy into heat energy.
LED the p-n junction of fever must first through the wafer of semiconductor material to conduction to the surface of the wafer, this has certain thermal resistance.
From the perspective of LED components, owing to the different encapsulation structure, between wafer and stents have thermal resistance of various sizes.
The sum of the two thermal resistance constitutes the thermal resistance of leds Rj -
From the point of users, Rj - specific LED
A can't change this parameter, this is the LED packaging enterprises need to need to study the subject, but you can select the product of different manufacturer or model to reduce the Rj - as much as possible
Heat transfer way of LED lamps and lanterns, the LED is very complex, the main way that LED -
Fluid, as the designer of lamps and lanterns, truly meaningful work is to optimize the composition of the material and heat dissipation of lamps and lanterns as far as possible to reduce the LED components between the fluid and thermal resistance.
As a carrier of the installation of electronic components, LED components or main connected to the circuit board, in the form of welding metal matrix circuit board of the overall thermal resistance is relatively small, the commonly used have copper plate and aluminum plate, aluminum plate for prices and are widely used in the industry is relatively low.
Aluminum plate process and the thermal resistance of different manufacturers, general thermal resistance in 0.
C/W, price difference is big.
Aluminum plate will typically have three physical line, insulating layer, substrate layer.
General electrical insulating material heat conduction ability is poor, so the thermal resistance mainly comes from the insulating layer, and because of the insulating material difference is bigger.
With ceramic dielectric minimum thermal resistance.
Relatively cheap aluminum plate usually USES a fiberglass insulation or resin insulating layer.
Thermal resistance size is positively related to the thickness of insulating layer.
Under the condition of both cost and performance, reasonable selection of aluminum plate type and aluminum plate area.
Contrast, correct design with the aluminum plate radiator and radiator shape best join is the key to the success or failure of the lamps and lanterns design.
To determine capability of the heat dissipation factor really is the contact area of the radiator and fluid and fluid velocity.
LED lamps and lanterns are commonly adopt the way of natural convection to passive cooling, thermal radiation is one of the main way of heat dissipation.
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