Design and application on drive circuit of full digital inverter based on FPGA

A new drive circuit design scheme of full digital inverter which adopts current-mode dual-loop pulse width modulation design based on field programmable gate array(FPGA)is proposed.Through analyzing of various drive pulse states in normal and abnormal cases,FPGA control circuits,drive isolation circuits and protection circuits to generate drive pulses are realized,and digital interfaces such as dual-port random access memory,serial peripheral interface to communicate with the host are designed also.Otherwise,various anti-jamming approaches are presented.Experiments of scene welding demonstrate that the digital drive circuit not only works stably in the welding environment and produces timely protection signals,but also has strong adaptability and can be widely applied to various kinds of full digital inverters.