| A new type large power invert plasma spray power supply is introduced. The main structure of the power supply adopts parallel connecting method,it is rated 80 kW and the output current can be up to 1 000 A.A safeguard method of IGBT is introduced in the paper after analyzing the reason of over current flow and over voltage.It is proved that the invert plasma spray power supply has high stability through practical spraying,and now it is put into use. |