Patent ID: 8249217

Claim:
An inverter device comprising an inverter circuit that is constructed by plural switching elements, receives a PWM driving signal to be supplied to the switching elements to convert a DC voltage supplied from a DC power source to a high-frequency AC voltage and outputs the thus-converted high-frequency AC voltage; and control means for outputting the PWM driving signal to be supplied to each of the switching elements and controlling the output of the PWM driving signal, characterized by further comprising: means for supplying a PWM driving signal for detecting short-circuit of each switching element to each switching element before the inverter circuit receives a PWM driving signal for supplying power to a load, and means for detecting an on-voltage of a switching element which is serially connected to each switching element turned on when the switching element is turned on by the short-circuit detecting PWM driving signal, thereby detecting an overcurrent or short-circuit state of the switching element.