Heat pipe is a kind of heat conducting element with high thermal conductivity which relies on the phase change of internal working medium for efficient heat transfer, the temperature uniformity of the heat sink base and the efficiency of fin are realized by embedding fin in the heat sink base, it transfers heat through evaporation and condensation of the working medium in a closed vacuum tube. (working medium of heat pipe includes helium and nitrogen at low temperature and liquid metals such as sodium and potassium at high temperature). The common working medium of heat pipe is ammonia, water, methanol, etc.), which makes use of the principle of capillary absorption and other fluids to achieve a good cooling effect. It has high thermal conductivity, good isotherm, high thermal conductivity, heat transfer area on both sides of cold and heat can be arbitrarily changed, heat transfer can be long-distance, and temperature can be controlled. By contacting the base of heat pipe heat sink with the core of thyristor, igbt, and other high-power power electronic devices, the heat of the core can be directly derived quickly. So as to realize the overall performance of heat sink, common types of aluminum, copper soldering heat sink has been can not meet the requirement of the thermal resistance, need to use new heat sink with heat pipe for better performance.
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