30kHz IGBT逆变焊机主电路设计
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摘要
焊机逆变频率的提高可改善焊机控制精度及动特性。但频率提高后会产生开关损耗增加、IGBT开关应力加大、电磁干扰变强等问题。研制的30 k Hz逆变MIG焊机采用全桥ZVZCS主电路,对频率提高后主电路逆变器谐振参数、IGBT选择、高频变压器、输出电抗器等进行了系统分析和设计计算。最后还给出了为提高焊机可靠性而设计的驱动与保护电路。
The dynamic characteristics and control precision can be improved by increasing the inverter welder's frequency.However,some problems,such as the increase of switching losses and IGBT switch stress,strong electromagnetic interference and so on,are happened after the inverter welder's frequency increases.In this paper,30 k Hz inverter MIG welder is developed by using ZVZCS full bridge.The main circuit inverter resonant parameters,IGBT selection,high frequency transformer and output reactor are designed and calculated.The drive and protection circuits are designed to improve the reliability of welder.
The dynamic characteristics and control precision can be improved by increasing the inverter welder's frequency.However,some problems,such as the increase of switching losses and IGBT switch stress,strong electromagnetic interference and so on,are happened after the inverter welder's frequency increases.In this paper,30 k Hz inverter MIG welder is developed by using ZVZCS full bridge.The main circuit inverter resonant parameters,IGBT selection,high frequency transformer and output reactor are designed and calculated.The drive and protection circuits are designed to improve the reliability of welder.
引文
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[2]温永平,周益铮.英飞凌第四代IGBT—T4在软开关逆变焊机中的应用[J].电焊机,2009,39(2):77-81.
[3]钱金川.全桥式逆变电源主电路设计[J].电工电气,2010(4):12-19.
[4]杨双吉.全桥逆变弧焊电源电路设计与仿真[J].科技创业家,2011(3):121-122.
[5]吴冬春,蒋爽,付炜亮.应用于软开关逆变焊接电源的中频变压器设计[J].机电工程技术,2007,36(10):88-90.