Abstract: A generator for arc welder, of the type composed of a rectifier stage followed by a PFC stage and by an inverter stage, both of the high-frequency type, the latter stage supplying power to a final rectifier stage for a welding arc, the PFC stage being composed of two inductors that are mutually magnetically coupled, two diodes with opposite conduction directions, two leveling capacitors and means for controlling the succession of the on and off switchings of the two first switches, so as to shape the current absorbed by the rectifier stage by correlating it to the waveform of the line voltage. The inverter stage comprises four triads of second controlled switches, diodes and capacitors, and there is also a control device for the four second switches and for the current for the final stage that supplies power to the welding arc.

Abstract: A generator for unitary power factor arc welders, comprising a current transformer that supplies, at a secondary winding thereof, a welding arc and is in turn supplied, at a primary winding thereof, by an input leveling and rectifying unit, between the rectifier unit and the transformer being interposed an electronic circuit with two electronic switches that provide a half-bridge structure that performs DC/DC conversion by way of the combination of the transformer and of a rectifier stage connected to the secondary winding of the transformer, and a leveling inductor, the circuit having the combination of resonant capacitive and inductive components arranged on the side of the primary winding of the transformer, the components charging the bank of capacitors arranged downstream of the electronic switches, furthermore keeping the voltage across it constant.

Abstract: A generator for arc welder, of the type composed of a rectifier stage followed by a PFC stage and by an inverter stage, both of the high-frequency type, the latter stage supplying power to a final rectifier stage for a welding arc, the PFC stage being composed of two inductors that are mutually magnetically coupled, two diodes with opposite conduction directions, two leveling capacitors and means for controlling the succession of the on and off switchings of the two first switches, so as to shape the current absorbed by the rectifier stage by correlating it to the waveform of the line voltage. The inverter stage comprises four triads of second controlled switches, diodes and capacitors, and there is also a control device for the four second switches and for the current for the final stage that supplies power to the welding arc.

Abstract: A portable welder, comprising a box-like body that contains a welding generator associated with cooling devices, the welding generator being functionally connected to an electrode supporting clamp, to a ground clamp and to an electric power supply system. A handle for gripping and orienting the welder protrudes from the box-like body; the electrode supporting clamp is rigidly coupled to the free end of the handle.

Abstract: A generator for unitary power factor arc welders, of the type that comprises a current transformer (104) that supplies, at a secondary winding thereof, a welding arc and is in turn supplied, at a primary winding thereof, by an input leveling and rectifying unit (101), between the rectifier unit and the transformer being interposed an electronic circuit (103) with two electronic switches that provide a half-bridge structure that performs DC/DC conversion by way of the combination of the transformer and of a rectifier stage (105) connected to the secondary winding of the transformer, and a leveling inductor (106), the circuit having the combination of resonant capacitive and inductive components arranged on the side of the primary winding of the transformer, the components charging the bank of capacitors arranged downstream of the electronic switches, furthermore keeping the voltage across it constant, means being also provided which are suitable to control the welding current and to ensure sinusoidal-type abso

Abstract: A welding generator comprising an input rectifier stage, a bank of leveling capacitors, an inverter block, a transformer, a rectifier stage and an inductor downstream of which the arc forms and an input voltage adapting regulator stage having, in series at the output of the input rectifier, a first controlled electronic switch with in output a first diode also connected to the common line, an inductor, a second controlled electronic switch and a second diode being connected in series downstream of the first controlled electronic switch, the output of the inductor being connected to the common line, the second diode being connected to the bank of leveling capacitors; the voltage Vin measured at the output of the rectifier stage having thus the same orientation as the voltage V0 measured across the bank of leveling capacitors.

Abstract: A generator for arc welding machines provided with an input rectifier stage which has a unit power factor and comprises an inductor, on the mains side, two diodes and two electronic switches, one for each diode, which are driven by a driver which renders the absorption of the input rectifier stage practically sinusoidal.

Abstract: A welding generator comprising an input rectifier stage, a bank of leveling capacitors, an inverter block, a transformer, a rectifier stage and an inductor downstream of which the arc forms and an input voltage adapting regulator stage having , in series at the output of the input rectifier, a first controlled electronic switch with in output a first diode also connected to the common line, an inductor, a second controlled electronic switch and a second diode being connected in series downstream of the first controlled electronic switch, the output of the inductor being connected to the common line, the second diode being connected to the bank of leveling capacitors; the voltage Vin measured at the output of the rectifier stage having thus the same orientation as the voltage V0 measured across the bank of leveling capacitors.