Welder With Active Linear DC Filtering Circuit

A power supply circuit for a linear direct current welder comprising:

• a plurality of power supply capacitors;
• a drive signal coupled to the power supply capacitors;
• a charge/discharge circuit coupled to the plurality of power supply capacitors;
• a plurality of active filters circuit coupled to the power supply circuit, the plurality of active filter circuits being selectively switched on or off to create a plurality of welding wave forms, wherein each of the plurality of active filter circuits comprises:
• a filter transistor;
• a filter capacitor coupled to the transistor;
• a drive signal coupled to the filter transistor;
• and
• a charge/discharge circuit coupled to the filter transistor;
• a low current ignition circuit coupled to the power supply circuit;
• and
• a welding load coupled to the power supply circuit.

A method of creating a plurality of welding waveforms, the method comprising the steps of:

• providing a power supply for use in a linear direct current welder, the power supply comprising:
• a plurality of power supply capacitors;
• a drive signal;
• a charge/discharge circuit coupled to the plurality of power supply capacitors;
• and
• at least one active filter circuit coupled to the circuit, the at least one active filter circuit being selectively switched on or off to create a plurality of welding wave forms;
• and
• selectively activating the at least one active filter circuit in the power supply to create the plurality of welding waveforms.