数字交流TIG多焊机协调器研究

Research of Digital AC TIG Multi-Welding Machine Coordinator

分析多台交流TIG电源同时焊接一个工件时,由于相位不同步导致焊接电源输出时回路的阻抗发生变化和电流互串问题,进一步导致次级IGBT关闭时过电压的发生。为了解决上述问题,提出一种能够设定交流相位和频率的协调控制器,该控制器能够实现焊接电流相位的同步,从而解决由于相位不同步而引起的次级IGBT反压高和电流互串的问题。该协调控制器可以实现交流频率和占空比的设定并将参数通过485通信传递给焊接电源;还可以协调焊接电源相位输出,保证焊接电源的相位输出一致。

When multiple AC welding power sources weld a same weldment at the same time,the current of the welding power sources output in series due to the phase out-of-sync and the impedance of the circuit increases,which further leads to the occurrence of overvoltage when the secondary IGBT is turned off.To solve this problem,a coordinated controller that can set the AC phase and frequency is proposed.The controller can realize the synchronous control of the phase,so as to solve the problem of high back-voltage of the secondary IGBT and mutual series of current caused by the asynchronous phase.The coordination controller can realize the setting of the coordination parameters AC frequency and cleaning width,and transmit the parameters to the welding power source through 485 communication,it can also realize the coordination of the phase output of the welding power source to ensure the phase output of the welding power source is consistent.The coordinated controller can realize the setting of AC frequency and duty cycle and transmit the parameters to the welding power source through 485 communication,it can also realize the coordinated phase output to the welding power source to ensure the same phase output of the welding power source.