Patent ID: 8426772

Claim:
An electric welding machine comprising: a main transformer that provides isolation from a power input to the welding machine; the main transformer having a first secondary winding in circuit communication with a welder power output; and a second secondary winding in circuit communication with an auxiliary power supply having an auxiliary power output; the auxiliary power supply including: an input for monitoring the welder power output to determine if the welder power output is on; circuitry for monitoring the output of the auxiliary power output; and circuitry for reducing the available power to the auxiliary power output if there is a surge in power demand on the auxiliary power output that exceeds a set limit and the welder power output is on; and wherein the circuitry for reducing the available power to the auxiliary power output comprises pulse width modulation circuitry for providing a pulsed input to a filter, wherein the width of the pulse input is decreased to decrease the available power to the auxiliary power output.