晶体管微电弧电源主电路与驱动电路设计

摘要

For the shortcomings of the traditional main circuit of the transistor welding power,a main circuit of the transistor-type micro-arc welding power based on the transistor,combining the first-stage inverter with the latter-stage transistor,is designed.The former stage adopts the inverter structure to supply power for the later-stage transistor group,and it adjusts the output voltage via the coordinated control of the voltage and current.The post-stage transistor group regulates the welding current and external characteristics by the negative current feedback.This circuit makes good use of the advantages of them.The front-stage inverter drive circuit which is isolated by a pulse transformer is designed and a high-frequency drive circuit of the post-stage transistor is designed with high-speed optocoupler 6N137 and driver chip IXDN604.The result of the drive signal shows that drive circuit can achieve high-speed transistor drive to achieve the main circuit operation.%针对传统的晶体管焊接电源主电路存在的一些不足,设计了一种基于晶体管式的数字化微电弧焊接电源主电路,将前级逆变式与后级晶体管组结合,即前级采用逆变式结构为后级晶体管组供电,通过电压电流协调反馈调节前级输出电压,后级晶体管组通过电流负反馈调节输出所需的焊接电流和外特性,这充分发挥了两者的优势.设计了由脉冲变压器隔离的前级逆变驱动电路和由高速光耦6N137与高速驱动芯片IXDN604构成的后级晶体管高频驱动电路.驱动信号测试结果显示,驱动电路能实现对功率管的高速驱动,从而实现主电路的运行.