Study on a Novel Second Inverting Main Circuit of the Square-wave AC TIG Inverter
Du Chun · IEEE Transactions on Power Electronics · 2003
In order to improve the efficiency and reduce the cost of the square wave AC TIG machine, a novel topology of half bridge circuit is presented, which is composed of coupling reactor and snubbed circuit with constant voltage. Not only can it convert current but also make the AC current easily across zero. The principle of the main inverting stage of the machine is analyzed and the calculations of the correlative parameters are presented in this paper. Experiment shows that the design of the main circuit is rational and reliable. Without any other special devices, the pulse of stable arc created by the circuit structure itself can fit the need of the AC TIG welding.