Inverter power supply for welding

A high frequency power supplying a welding current through a choke to a welding station including an electrode element and a workpiece element, said power supply including a transformer means for creating a first current pulse in a first secondary winding and a second current pulse in a second secondary winding and means for connecting said secondary windings to pass said current pulses through said choke and across said elements, said transformer means including a first transformer with a first core, a first primary winding, and means for receiving on said first core said first secondary winding with said first core being magnetized in a first flux direction upon creation of said first pulse by said first primary winding, a second transformer with a second core, a second primary winding, and means for receiving on said second core said second secondary winding with said second core being magnetized in a second flux direction upon creation of said second pulse by said second primary winding, and supply means for creating said first and second pulses, said supply means including a rectifier with an output voltage, a first capacitor having a first voltage for directing rectified current to said first primary winding, a second capacitor having a second voltage for directing rectified current to said second primary winding, first switch means for controlling the current of said first pulse as supplied from said first capacitor in accordance with a current demand signal, second switch means for controlling the current of said second pulse as supplied from said second capacitor in accordance with said current demand signal and control means for maintaining said first and second voltages generally equal, said control means including means for creating a first voltage signal indicative of said first voltage, creating a first reference voltage signal comparing said first voltage signal and said first reference voltage signal to obtain a first error signal and adjusting said current demand signal in accordance with said first error signal before said command signal controls said first switch means.

A high frequency power supply for supplying a welding current through a choke to a welding station including an electrode element and a workpiece element, said power supply including a transformer means for creating a first current pulse in a first secondary winding and a second current pulse in a second secondary winding and means for connecting said secondary windings to pass said current pulses through said choke and across said elements, said transformer means including a first transformer with a first core, a first primary winding, and means for receiving on said first core said first secondary winding with said first core being magnetized in a first flux direction upon creation of said first pulse by said first primary winding, a second transformer with a second core, a second primary winding, and means for receiving on said second core said second secondary winding with said second core being magnetized in a second flux direction upon creation of said second pulse by said second primary winding, and supply means for creating said first and second pulses, said supply means including a rectifier with an output voltage, a first capacitor having a first voltage for directing rectified current to said first primary winding, a second capacitor having a second voltage for directing rectified current to said second primary winding, first switch means for controlling the current of said first pulse as supplied from said first capacitor in accordance with a current demand signal, second switch means for controlling the current of said second pulse as supplied from said second capacitor in accordance with said current demand signal and control means for maintaining said first and second voltage generally equal, said control means including means for creating a second signal indicative of said second voltage, creating a second reference voltage signal comparing said second voltage signal and said second reference voltage signal to obtain a second error signal and adjusting said current demand signal in accordance with said second error signal before said command signal controls said second switch means.

In a high frequency power supply for supplying a welding current through a choke to a welding station including an electrode element and a workpiece element, said power supply including a transformer means for creating a first current pulse in a first secondary winding and a second current pulse in a second secondary winding and means for connecting said secondary windings to pass said current pulses through said choke and across said elements, said transformer means including a first transformer with a first core, a first primary winding, and means for receiving on said first core said first secondary winding with said first core being magnetized in a first flux direction upon creation of said first pulse by said first primary winding, a second transformer with a second core, a second primary winding, and means for receiving on said second core said second secondary winding with said second core being magnetized in a second flux direction upon creation of said second pulse by said second primary winding, means for creating said first pulse including a first capacitor means having a first voltage and a first switch means for rapidly connecting said first capacitor means across aid first primary winding, means for creating said second pulse including a second capacitor means having a second voltage and a second switch means for rapidly connecting said second capacitor means across said second primary, and control means for maintaining said first and second voltages generally equal, said control means including means for creating a first voltage signal indicative of said first voltage, creating a first reference voltage signal comparing said first voltage signal and said first reference voltage signal to obtain a first error signal and adjusting said first pulse in accordance with said first error signal.