Welding power supply with DC reactor having two inductance conditions

摘要

The present application relates to a welding power supply (11), wherein total resistance at an output side of the power supply (11) is measured in a measurement mode based on the output voltage when an output current I generated by an inverter circuit (22) is set as a current. Inductances, when the output current I are set to two currents corresponding to a normal region and oversaturated region of a DC reactor (25), are detected. A total inductance is calculated as a function by linearly interpolating the two inductances. During welding, a controller (31) corrects changes in the voltage related to the total resistance and the total inductance for the detected output voltage to calculate the tip voltage.