The invention relates to a multifunctional digitized
welding machine, which comprises a full-
bridge type inversion main circuit, a
control circuit and a
soft switch PWM (Pulse-Width Modulation)
driving circuit, wherein the full-
bridge type inversion main circuit is composed of an IGBT (Insulated Gate Bipolar Translator); the
soft switch PWM
driving circuit of a symmetric carrier is based on a CPLD (
Complex Programmable Logic Device) or FPGA (
Field Programmable Gate Array); the inversion main circuit comprises a rectifying filtering module, an IGBT full-bridge inversion module, a main
transformer and a secondary rectifying filtering module; the
control circuit comprises a DSP (
Digital Signal Processor) control processor, a manual idle-dropping circuit, a regulating, detecting and sampling circuit for a feedback current and
voltage signal outputted by the
welding machine, a collecting and setting circuit for a feeding speed and given
voltage of the
welding machine, a display circuit for an interface and parameter of an external keyboard and a communication circuit connected to a PC (
Personal Computer); the regulating, detecting and sampling circuit for the feedback current and
voltage signal outputted by the welding machine comprises a Hall
voltage sensor for detecting a feedback
arc voltage outputted by the welding machine and a Hall
current sensor for detecting an output current of the welding machine; and the collecting and setting circuit for the feeding speed and given voltage of the welding machine comprises a collecting circuit for a given voltage and given current, namely the feeding speed, on a panel of a feeder.