一种逆变CO2焊机IGBT驱动电路设计

根据逆变CO2焊机IGBT的工作特点,分析了逆变CO2焊机IGBT的驱动要求,设计了一套由分离元件构成的逆变CO2焊机IGBT驱动电路.由DSP产生的两路PWM信号首先经分频电路进行分频,再经电气隔离与电压调整电路进行信号调理,最后经变压器隔离放大电路进行电气隔离和电压调整放大,最终可获得逆变焊机IGBT安全可靠工作的PWM驱动信号.根据设计,制作了全套驱动电路,采用20 kHz工作频率进行试验.试验结果表明,获得的IGBT驱动信号的栅极正负偏压、栅极电压上升时间以及信号同步性和抗干扰性均符合设计要求,能够安全可靠地驱动逆变CO2焊机IGBT工作.

A design for the IGBT drive circuit of digital inverter CO2 welder

The paper analysed the requirement of IGBT drive circuit based on characteristics of digital inverter CO2 welder.And a IGBT drive circuit was designed according to the requirement.The PWM signals,which generated by DSP,were processed by frequency division circuit firstly.Then the signals were modulated by isolation circuit and pulse transformer circuit in order to meet the requirement of IGBT drive circuit.The IGBT driver circuit hardware was made according to this design,and the experiment were conducted with 20 kHz working frequency.The experiments results were testified that the IGBT driver circuit could drive IGBT safely and steadily.