大功率电力电子散热器测试方案及性能研究

摘要

对大功率电力电子器件散热器性能测试的两种方案及其性能进行试验及仿真分析,结果表明:散热器测点温度下降趋势与发热功率有关,发热功率越大,随着散热器入口流量增加,下降趋势越明显,散热器热阻随流量增大敏感性越高,通过提升流量来降低散热器热阻效果越好.比较了不同发热功率下,采用弹性顶压方式和开槽埋线方式测量方案对测量温度结果的影响.由仿真可知,在流量相同时,散热器热阻随加热功率的增大而略微降低,但下降趋势不明显;当加热功率相同时,散热器热阻会随流量的增加而显著减小.%The high power electron device radiator two scheme of the performance test and performance test and simulation analysis,the results show that,the radiator measuring point temperature decline is associated with the hearing power,heating power,the greater the increase with the radiator inlet flow,the downward trend,the more obvious,the radiator thermal resistance increases with flow rate sensitivity is higher,the flow through ascension to reduce heat sink thermal resistance effect,the better.The influence of elastic jacking method and groove burying method on measuring temperature results under different heating power is compared.The simulation result shows that the flow phase radiator thermal resistance slightly decreased with the increase of heating power,but the decline is not obvious.When the heating power is the same,the radiator thermal resistance decreases significantly with the increase of flow rate.