The rising characteristic of the current in the large welding current range is improved, and the ripple component in the small welding current range is minimized.;In the inverter welding power supply device to be supplied to the object to be welded 15, a welding current setting circuit 18 for setting a welding current supplied to the object to be welded 15, and a current or a welding transformer flowing through the inverter circuit 12. The current detector 16 which detects the current flowing to the primary side and the set value of the welding current setting means 18 and the detected value detected by the current detector 16 are compared, and when the detected value reaches the set value, a coincidence signal is output. Pulse width control to turn off the current by the comparison circuit 17, the gate circuit 19 which prohibits the output of the comparison circuit 17 for a predetermined time according to the set current, and the coincidence signal passing through the gate circuit 19. The circuit 20 and the polarity inversion circuit 21 which inverts the pulse signal from the pulse width control circuit 20 and outputs it to the inverter circuit 12 were comprised.
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