EB501-10 S2 横河YOKOGAWA 自动化模块

EB501-10 S2 横河YOKOGAWA 自动化模块

风扇冷却

EB501随着风扇制造技术的发展，风扇的工作稳定性和使用寿命有较大的进步，其平均无故障时间是5万小时。

采用风扇散热后可以减去笨重的散热器，使得整流器的体积和重量大大改善，原材料成本也大大降低。随市场竞争的加剧，市场价格的下滑，这种技术已成为当前的主要潮流。

EB501这种方式的主要缺点是风扇的平均无故障时间较整流器10万小时时间短，若风扇故障后对电源的故障率影响大。所以为风扇的使用寿命，风扇的转速是随设备内的温度变化而变化的。其散热量Q=Km△t(K换热系数，m换热空气质量，△t温度差)。m换热空气质量是和风扇的转速相关，当整流器输出功率增大时，其功率元件的温度会上升，而功率元件温度的变化到整流器能将这种变化检测到，再到增加风扇的转速以加强散热，在时间上是有很大滞后的。如果负载经常突变，或者市电输入波动大，就会造成功率元件出现快速的冷热变化，这种突变的半导体温度差产生的热应力与热冲击，会导致元件的不同材料部分产生应力裂纹。使之过早失效。

Fan cooling

With the development of fan manufacturing technology, the working stability and service life of fans have been greatly improved, and the average trouble-free time is 50,000 hours.

The bulky radiator can be reduced after the use of fan heat dissipation, so that the volume and weight of the rectifier are greatly improved, and the cost of raw materials is greatly reduced. With the intensification of market competition and the decline of market price, this technology has become the main trend at present.

The main disadvantage of EB501 this way is that the average trouble-free time of the fan is shorter than that of the rectifier 100,000 hours, and if the fan fails, the failure rate of the power supply is greatly affected. Therefore, for the service life of the fan, the speed of the fan changes with the temperature change in the equipment. Its heat dissipation Q=Km△t(K heat transfer coefficient, m heat transfer air mass, △t temperature difference). m heat transfer air quality is related to the speed of the fan, when the output power of the rectifier increases, the temperature of the power component will rise, and the change in the temperature of the power component to the rectifier can detect this change, and then to increase the speed of the fan to strengthen the heat dissipation, there is a great lag in time. If the load often mutates, or the mains input fluctuates greatly, it will cause rapid thermal and cold changes in the power component, and the thermal stress and thermal shock generated by this sudden semiconductor temperature difference will cause stress cracks in different material parts of the component. Make it prematurely ineffective.