At present, there are two types of air-cooled radiators for high-power power electronic devices: casting and profiles. We collectively refer to them as solid radiators to distinguish them from hollow radiators manufactured according to the principle of heat pipes or thermosiphons. The biggest problem with physical radiators is that as the power increases, the weight of the radiator increases faster, making it very unreasonable. The direct calculation of the shape of a solid radiator requires a numerical method, which requires a large amount of work and is difficult to reveal the influence of various factors. If double-sided cooling is used, the radiator is composed of two heat sinks, and the total heat dissipation and weight are twice that of the heat sink. Calculation results and discussion According to the above model, if the characteristic size or geometric average size of the heat sink is given, it is not difficult to calculate the heat dissipation heat resistance and the calculation results of the metal consumption map required for the unit heat dissipation, which correspond to the three materials of aluminum copper silver And aluminum hollow radiator. If the thermal conductivity of the material is infinite, the thermal resistance will no longer exist. The performance and prospective resistance of solid high-power air-cooled radiators such as Hu Weilin and the General Thermal Supplement are convection thermal resistance. At this time, there is no temperature drop in heat conduction, and the temperature of all the heat dissipation surfaces is equal to five. Considering that the heat sink contains two heat dissipation bodies with heat dissipation area, the heat dissipation amount and thermal resistance value are respectively a graph. The curve of the resistance's share in the total thermal resistance as a function of the geometric mean size of the heat sink. When it is greater than a certain value, the former share should exceed the latter. This value can be used as a reasonable limit for the size of the solid heat sink. The greater the thermal conductivity of the material, the greater the corresponding value. A size that is too large is not desirable, because when the thermal conductivity of the heat conduction is dominant, reducing the convection thermal resistance will not have a significant effect on the total thermal resistance.
RJ45 JACK+USB Section,60 Jack.Professional RJ45 Connection Guide manufacturer is located in China, including RJ45 Connection Order,RJ45 Wall Jack Installation,RJ45 Modular Jack Wiring, etc.
1 , with or without transformers
2 , with or withour PoE function
3 , Customized length of Pin
4 , Customized housing color
5 , Customized contact area gold plating
6 , Customized LED Indicator color
The RJ-45 interface can be used to connect the RJ-45 connector. It is suitable for the network constructed by twisted pair. This port is the most common port, which is generally provided by Ethernet hub. The number of hubs we usually talk about is the number of RJ-45 ports. The RJ-45 port of the hub can be directly connected to terminal devices such as computers and network printers, and can also be connected with other hub equipment and routers such as switches and hubs.
RJ45 JACK+USB Section
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