变频器中的IGBT模块损耗计算及散热系统设计

Losses Calculation of IGBT Module and Heat Dissipation System Design of Inverters

提出了一种设计变频器散热系统的实用方法,建立了比较准确且实用的变频器中IGBT(绝缘栅型双极晶体管)模块的通态损耗和开关损耗的计算方法,考虑了温度对各种损耗的影响,采用热阻等效电路法推导得出了散热器及功率器件各点温度的计算公式,并给出了散热器热阻的实用计算公式。在此基础上设计了一套采用强迫风冷的散热系统,计算结果与试验结果的对比,验证了该设计方法的合理性与实用性。

A practical method to design the heat dissipation system of the inverter is presented. By considering the effect of junction temperature on the losses, the conducting losses and the switching losses of the IGBT module used in the inverter are calculated. A heat resistance equivalent circuit of the heat dissipation system is presented; a practical formula to calculate the heat resistance of heat dissipation system is obtained, and the temperature calculation formulas of the IGBT module and heat dissipation system is derived. A heat dissipation system for the inverter using forced-air-cool is designed. The measured losses and temperatures are given, the calculated results and the experiment results verify the validity and practicability of the presented design method of heat dissipation system.