When the LED chip is in operation, 30-35 electric energy is converted into light energy, and another 65-70 is converted into heat energy. LEDs are very sensitive to temperature effects. In general, LEDs with a junction temperature of 125 degrees Celsius can avoid performance degradation or even failure. 70% of the failures are caused by the LED temperature being too high, and the failure rate doubles for every 20 degrees Celsius increase in temperature at half the rated power.
heat transfer
There are three basic links in the heat conduction of LED lamps, from chip to epitaxy, to the package substrate, to the heat sink or the case. At present, the LED cooling technology problem is that the LED node is limited by temperature. Under normal circumstances, the maximum temperature is 125 degrees Celsius; the design value is 90 degrees Celsius, and the ambient air temperature difference is only 55 degrees Celsius.
LED heat dissipation
Moreover, the LED heat dissipation can not use the fan but the natural convection heat dissipation method, not to mention the LED heat dissipation design must also meet the optical requirements of the LED lighting fixture. In addition, the LED heat dissipation design must also meet the lighting modeling needs, so that there is a better selling point, and the lighting design limits the heat dissipation design.
If the optical efficiency is reduced in order to disperse the arrangement of the heat-dissipating light source, this is not worth the loss. The heat dissipation cost of the LED is very high. The size and weight limit of the LED lighting fixture cannot fill a large amount of high thermal conductivity heat-conducting material, and the thermal conductive material includes : High thermal conductivity silicone sheet, silicone grease, solder, phase change material, etc.; among them, thermal conductive silicone sheet, high thermal conductivity silicone gasket is the most cost-effective, thermal conductivity material is preferred.
Medical Actuator
Medical series mainly apply for medical equipment, such as hospital bed, dental chair, rehabilitation training equipment, etc. They are very quiet so that you can barely notice it. More than 4 models are available for different requirements. Max. load ranges from 6,000N to 12,000N. There are different controllers to be chosen, including handset and control box.
Medical Care Actuator,Electric Linear Actuator,Actuator For Patient Lift,Dc Medical Care Actuator
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