A system having a welding power source, comprising: a welding power conversion circuit configured to convert an input current to an output current; the welding power conversion circuit comprising a bridge circuit including switching transistors (811, 812, 813, 814) forming a full H-bridge configuration, and a bi-polar arc regulation circuit including an inductor, a constant current source, a diode and optionally a switching transistor; the switching transistors (811, 812, 813, 814) forming a plurality of switches and corresponding current paths including at least: a positive polarity main switch on a positive polarity current main path, the positive polarity current main path includes a welding path from an electrode to a workpiece, a positive polarity auxiliary switch on a positive polarity current auxiliary path and a polarity transition auxiliary path, a negative polarity main switch on a negative polarity current main path, the negative polarity current main path includes the welding path from the workpiece to the electrode, a negative polarity auxiliary switch on a negative polarity current auxiliary path and the polarity transition auxiliary path, and an independent discharge control switch on an independent discharge control current path; a controller configured to switch at least one of the plurality of switches; and a superposition capacitor configured to discharge stored energy in response to a polarity change in the output current, the superposition capacitor configured to charge at least when current flows through the polarity transition auxiliary path, characterized in that the independent discharge control current path includes the superposition capacitor, the independent discharge control switch and a discharge diode. a welding power conversion circuit configured to convert an input current to an output current; the welding power conversion circuit comprising a bridge circuit including switching transistors (811, 812, 813, 814) forming a full H-bridge configuration, and a bi-polar arc regulation circuit including an inductor, a constant current source, a diode and optionally a switching transistor; the switching transistors (811, 812, 813, 814) forming a plurality of switches and corresponding current paths including at least: a positive polarity main switch on a positive polarity current main path, the positive polarity current main path includes a welding path from an electrode to a workpiece, a positive polarity auxiliary switch on a positive polarity current auxiliary path and a polarity transition auxiliary path, a negative polarity main switch on a negative polarity current main path, the negative polarity current main path includes the welding path from the workpiece to the electrode, a negative polarity auxiliary switch on a negative polarity current auxiliary path and the polarity transition auxiliary path, and an independent discharge control switch on an independent discharge control current path; a controller configured to switch at least one of the plurality of switches; and a superposition capacitor configured to discharge stored energy in response to a polarity change in the output current, the superposition capacitor configured to charge at least when current flows through the polarity transition auxiliary path, characterized in that the independent discharge control current path includes the superposition capacitor, the independent discharge control switch and a discharge diode. a positive polarity main switch on a positive polarity current main path, the positive polarity current main path includes a welding path from an electrode to a workpiece, a positive polarity auxiliary switch on a positive polarity current auxiliary path and a polarity transition auxiliary path, a negative polarity main switch on a negative polarity current main path, the negative polarity current main path includes the welding path from the workpiece to the electrode, a negative polarity auxiliary switch on a negative polarity current auxiliary path and the polarity transition auxiliary path, and an independent discharge control switch on an independent discharge control current path; a controller configured to switch at least one of the plurality of switches; and a superposition capacitor configured to discharge stored energy in response to a polarity change in the output current, the superposition capacitor configured to charge at least when current flows through the polarity transition auxiliary path, characterized in that the independent discharge control current path includes the superposition capacitor, the independent discharge control switch and a discharge diode.