Inverter device capable of suppressing overcurrent without increasing a load and operation control method

An inverter device comprising:

• a switching unit that has a plurality of switching elements of which states are individually switched in response to a pulse signal supplied in accordance with a system voltage, converts an input DC voltage into an AC voltage, and outputs the converted AC voltage to a plurality of output lines;
• a filter unit that has output coils inserted into the output lines;
• a current detecting unit that detects a current of the output coils;
• a first control unit that stops supplying the pulse signal to the switching unit when an absolute value of a detection current detected by the current detecting unit is equal to or greater than a threshold value;
• and
• a second control unit that supplies the pulse signal;
• wherein the first control unit is configured to have a monostable multivibrator;
• wherein a certain time of the monostable multivibrator is longer than a sampling cycle of the second control unit.