Plasma arc power supply and method

摘要

A plasma arc system for plasma arc welding and cutting including a plasma arc torch in circuit with a constant current power supply comprising a transformer having a primary winding and at least one secondary winding with the primary winding connected to a source of alternating current and a bridge rectifier circuit connected across the secondary winding to provide a DC current output. A bank of capacitors is connected across the secondary winding of the transformer with its capacitive reactance matched to the inductive reactance of the transformer to establish a condition of resonance.