It is a power supply device that converts 50HZ power frequency alternating current into intermediate frequency (300HZ above to 1000HZ). It converts three-phase power frequency alternating current into direct current after rectification, and then converts the direct current into adjustable intermediate frequency current, which is supplied by capacitance and induction The intermediate frequency alternating current flowing in the coil generates high-density magnetic lines of force in the induction coil, and cuts the metal material contained in the induction coil, which generates a large eddy current in the metal material.