大功率三电平防爆变频器散热分析及计算

针对大功率三电平防爆变频器工作时产生的大量损耗会导致温升,从而影响变频器性能的问题,分析了常见的电力电子器件散热方式的原理及优缺点,指出热管结合强制冷风的散热方式较适用于对煤矿井下大功率三电平防爆变频器进行散热;对采用热管散热方式的大功率防爆变频器的IGBT、二极管、快速恢复二极管等主要功率器件的损耗和温升进行了分析,得出了功率器件的温升计算公式。实验结果表明,根据功率器件温升公式计算所得结果的误差在工程允许范围内,证明该公式具有一定的可行性和准确性。

Analysis and calculation of heat dissipation of explosive-proof three-level converter with high power

For problem that a great deal of power loss of explosive-proof three-level converter with high power causes temperature rise and further affects converter performance,the paper analyzed principle,advantages and disadvantages of normal heat dissipation modes of electronic devices,and pointed out that the method using heat pipe combined with forced cold air is fit for heat dissipation of explosive-proof three-level converter with high power of coal mine underground.It also analyzed loss and temperature rise of main power devices of high power converter including IGBT,diode and fast-recovery diode under heat dissipation of heat pipe,and got formula of temperature rise of the power devices.The experimental result showed that error of calculated value according to the formula is in allowable range,which proves feasibility and correctness of the formula.