快变换交流方波埋弧焊电源研制

Study on Submerged Arc Welding Power Source With High Commutation Rate AC Square-Wave

设计了一种双逆变电路结构的快变换交流方波埋弧焊电源,该电源由全桥型一次逆变电路和半桥型二次逆变电路组成。二次逆变电路由续流耦合电感、小功率电压尖峰吸收保护逆变回馈电路、IGBT半桥电路构成。一次逆变电路采用了电压、电流双闭环控制,二次逆变电路采用"临界共同导通"的控制策略,并对其电路换向过程进行了分析。试验结果表明,这种交流方波埋弧焊电源在电流换向过程中换向速度快且无过零死区时间,保证了电弧稳定性,具有良好的工程应用前景。

A new submerged arc welding（SAW） power source containing two inverting circuits, which is consist of primary full-bridge circuit inverter and a secondary half-bridge circuit inverter, has been developed. The secondary inverter is composed of a coupling inductor, a half-bridge circuit realized by two IGBTs and a small power inverter feedback circuit for voltage spike absorption protection of IGBTs. The current and voltage double closed-loop control technology is adopted in the primary inverter. A ＂common lead＂ control strategy is used in secondary inverter, which makes commutation rate of current higher. Experimental results show that the submerged arc welding power source works well in polarity exchange performance with high polarity exchange speed and indecently short current zero-crossing time, which makes welding arc stable. The submerged arc welding power source has broad prospects of production application.