Electric welding machine suitable to minimize exposure of the human body to the electromagnetic fields generated by the machine and associated minimization method

摘要

An electric welding machine suitable to minimize exposure of the human body to the electromagnetic fields generated by the machine, comprising at least one frequency converter (2), which is powered by the electrical mains (R) and is adapted to generate an alternating current (A), at least one control circuit (3), which is functionally connected to the frequency converter (2), and at least one welding transformer (4), which is functionally connected to the frequency converter (2) and is adapted to generate a welding current (S), the frequency converter (2) comprising at least one input stage (5) constituted by at least one AC/DC converter, at least one bank of capacitors (6) which is functionally connected to the AC/DC converter (5), and at least one output stage (7), which is constituted by at least one DC/AC converter, which is functionally connected to the bank of capacitors (6), the control circuit (3) being adapted to manage the input stage (5) so as to adjust the voltage (V) across the bank of capacitors (6) so as to obtain a waveform of the welding current (S) whose frequency components have amplitude and phase characteristics which minimize human exposure to electromagnetic fields.