A new method for digital inverted plasma cutting power supply is presented based on the parallel processing technology of digital signal processor(DSP) and microcontroller unit(MCU).With the high-speed data processing capacity of DSP

the sampling calculation for cutting parameters and the corresponding control algorithm are realized.With the powerful control ability of MCU

human-computer interface and logical control are achieved.The specific protection circuit

parameters memory circuit and automatic height-adjustment module are designed to realize over-voltage/current protection

optimum system parameters matching and cutting blowpipe adjustment.Experiments show that the intelligent digital power supply has good control performance

high reliability and flexible operation that have improved the cutting quality remarkably.