基于热阻的功放管散热问题

Question of Dispel Heat for Power Amplifier Tube Based on Thermal Resistance

功放管输出功率受集电极最大损耗所限,对功放管散热将提高功率输出。从热阻角度出发,功放管散热片的面积可按给定集电极耗散功率和环境温度求出,并采用等效热阻表示由散热片到环境热路上的热阻。即通过计算晶体管输出功率、集电极允许功耗、总热阻、散热片热阻,求出散热片表面积、厚度及其表面尺寸。

The output power of power tube was restrained by the maximal loss of collector and the power tube can increase the output power. According to the loss power of collector and environment temperature, the area of power tube fin could be calculated; and then, the equivalent thermal resistance was adopted to express the thermal resistance from fin to environment caloriduct. In other words, the surface area, thickness and surface size of fin were calculated by calculating the output power of transistor, enable power of collector, the overall thermal resistance, the thermal resistance of fin.