稳压式变极性焊接电源中的IGBT功率损耗和温升模型  

Power loss and temperature rise model for an IGBT in a variable polarity welding power supply with a reverse voltage stabilizer

作　　者：杨中宇 朱志明[1] 刘博[1] 汤莹莹[1] 

机构地区：[1]清华大学机械工程系,先进成形制造教育部重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2017年第5期471-475,482,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金项目(51075231);国家科技重大专项(2012ZX04012011)

摘　　要：在稳压式变极性焊接电源的输出电流极性变换过程中,加载在绝缘栅双极型晶体管(IGBT)上的瞬间脉冲功率损耗可能会使IGBT结温发生突变,可能超过最高结温允许值,进而影响其安全工作。该文利用热-电等效的局部网络模型,导出了在电源给定输出电流和再燃弧电压等参数条件下的IGBT最高结温计算公式,并将计算结果与仿真结果进行对比,证明了导出公式的正确性。分析了主要运行参数对IGBT最高结温的影响,获得了在选定IGBT型号时将其结温控制在安全范围的约束条件,为变极性焊接电源二次逆变电路设计时合理选择IGBT器件和优化运行参数提供了参考。During commutation in a variable polarity welding power supply with a reverse voltage stabilizer, the instantaneous pulse power loss loaded on the insulated gate bipolar translator （IGBT） could cause a jump in the junction temperature that might exceed the maximum allowable junction temperature, threatening safe operation of the IGBT. Formulas were derived to calculate the highest junction temperature using a partial fraction circuit model in the thermal-electric equivalent method. The results were compared with simulation results to verify the formulas. The effects of the main parameters on the junction temperature were analyzed to develop constraint conditions for controlling the IGBT junction temperature in a safe range. These results provide a theoretical basis for choosing reasonable IGBT and its working parameters for the power supply circuits and control strategy.

关 键 词：绝缘栅双极型晶体管(IGBT) 结温 热-电等效模型 变极性焊接电源 

分 类 号：TN492[电子电信—微电子学与固体电子学]