Analysis for dynamic characteristics of soft-switch arc welding inverter

作者：Wang, Ruichao^*; Xue, Jiaxiang

来源：Transactions of the China Welding Institution, 2012, 33(10): 17-20.

• Arc welding inverter
• Current transfer functions
• Dynamic characteristics
• Full-bridge inverters
• Peak currents
• Slope compensation
• Small signal equivalent circuit
• Waveform control

With extensive application of high performance thin sheet alloy and development of arc welding technology based on real-time energy waveform control, higher requirements for dynamic characteristics of arc welding inverter is put forward. Through phase-shifted full-bridge inverter circuit analysis, the main circuit can be equivalent to Buck model. The current transfer function of small signal equivalent circuit model is derived by using circuit theory. The influence factors of dynamic characteristics of arc welding inverter are analyzed by using automatic control theory. The specific design is proposed for the slope compensation based on peak current feedback. It is concluded that dynamic characteristics of arc welding inverter based on peak current feedback do not depend on reactance value of output circuit. The analysis process is confirmed by simulation and experimental results of actual circuit.

• 出版日期2012-10
• 单位华南理工大学