Method and apparatus for providing welding type power with balanced bus

A welding system for power supply comprising:

• the welding system for power supply for providing power suitable for electric arc welding, plasma arc cutting or induction heating,
• a preregulated bus including a plurality of capacitors,
• an output converter, including a plurality of switches, configured to receive the preregulated bus and to provide a welding power output, and having a control input, wherein the plurality of switches in the output converter are controlled by the control input;
• and a controller configured to receive a bus feedback signal from the preregulated bus indicative of a plurality of bus voltages, wherein the controller has a converter control output connected to the control input, wherein the controller has a bus voltage balancing module comprising at least one of hardware and software, wherein the controller configured to balance the plurality of bus voltages across the plurality of capacitors across the preregulated bus, wherein the bus voltage balancing module includes a scaled correction module comprising at least one of hardware and software, wherein the controller configured to scale a correction and is responsive to the bus feedback signal, and wherein the converter control output is responsive to the bus voltage balancing.