等离子弧焊机小电流输出设计

文章采用全桥-半桥工作方式切换的方法,调节逆变式等离子弧焊机输出电流。大电流时,主电路工作在全桥状态,而在小电流输出状态时,主电路由全桥转换成半桥工作,从而提高了占空比调节范围,保证输出电流的精度和稳定性。在小电流工作状态不会发生丢波现象,输出电流精度高、电流稳定性好,满足小电流焊接的需要。

In this paper,the output current of inverter plasma arc welding machine is regulated by the method of full bridge and half bridge circuit.When the current is large,the main circuit works in the full-bridge state,and when the current is small,the main circuit changes from the full bridge to the half-bridge state,which improves the regulation range of duty cycle and ensures the accuracy and stability of the output current.In the low current working state,there is no wave loss phenomenon,high output current precision and good current stability,which can meet the needs of low current welding.