The working process of inverter welding and cutting equipment is to rectify and filter three-phase or single-phase 50Hz AC power to obtain a relatively smooth DC power. The inverter circuit composed of IGBT or field-effect transistor converts the DC power into 15-100kHz AC power, which is then stepped down by the intermediate frequency main transformer and rectified and filtered again to obtain a stable DC output welding current (or inverted again to output AC power of the required frequency). The control circuit of the inverter welding and cutting equipment consists of a given circuit and a driving circuit. By processing the feedback of voltage and current signals, the whole machine cycle control is achieved. The control technology with pulse width modulation (PWM) as the core is adopted to obtain fast pulse width modulation constant current characteristics and excellent welding and cutting process effects.

RHM Semiconductor has developed welding machine specific IGBT for welding machines, which has lower turn off losses, lower system temperature rise, stronger impact resistance, and strong cost-effectiveness.