A welding wire feeder comprising: - a welding wire feed drive configured to drive welding wire towards a welding application; - wire feed control circuitry coupled to the welding wire feed drive and configured to control the drive of welding wire towards the welding application; - a boost converter configured to receive input power and to convert the input power to bus power applied to an internal bus; - a buck converter coupled to the internal bus and configured to convert the bus power to welding output suitable for a welding application; - input voltage and current sensors configured to measure input voltage and input current of the input power, respectively; - output voltage and current sensors configured to measure output voltage and output current of the welding output, respectively; - bus voltage and current sensors configured to measure bus voltage and bus current of the bus power, respectively; - control circuitry coupled to the boost converter, to the buck converter, to the input voltage and current sensors, and to the output voltage and current sensors, characterized in that the control circuitry is configured to drive the boost converter to reduce voltage ripple on the internal bus based upon at least one of the input voltage, the input current, the output voltage, the output current, the bus voltage, or the bus current, wherein the control circuitry is configured to determine a product of the output current and output voltage, to determine a sum of the product and a conversion loss, to divide the sum by the input voltage to determine a desired bus current, and to drive the boost converter to control the input current to the desired bus current. - a welding wire feed drive configured to drive welding wire towards a welding application; - wire feed control circuitry coupled to the welding wire feed drive and configured to control the drive of welding wire towards the welding application; - a boost converter configured to receive input power and to convert the input power to bus power applied to an internal bus; - a buck converter coupled to the internal bus and configured to convert the bus power to welding output suitable for a welding application; - input voltage and current sensors configured to measure input voltage and input current of the input power, respectively; - output voltage and current sensors configured to measure output voltage and output current of the welding output, respectively; - bus voltage and current sensors configured to measure bus voltage and bus current of the bus power, respectively; - control circuitry coupled to the boost converter, to the buck converter, to the input voltage and current sensors, and to the output voltage and current sensors, characterized in that the control circuitry is configured to drive the boost converter to reduce voltage ripple on the internal bus based upon at least one of the input voltage, the input current, the output voltage, the output current, the bus voltage, or the bus current, wherein the control circuitry is configured to determine a product of the output current and output voltage, to determine a sum of the product and a conversion loss, to divide the sum by the input voltage to determine a desired bus current, and to drive the boost converter to control the input current to the desired bus current.