Patent ID: 8274768

Claim:
An inverter device, comprising: a bridge circuit formed of a plurality of bridge-connected semiconductor switching elements having upper and lower arm semiconductor switching elements; a drive block having an upper arm photocoupler and a lower arm photocoupler which output drive signals for turning on and off the upper arm semiconductor switching elements and the lower arm semiconductor switching elements of the bridge circuit, respectively; and a control block including a drive signal generating circuit which generates the drive signals and supplies them to the upper arm photocoupler and the lower arm photocoupler, wherein the control block includes an upper arm shutdown circuit and a lower arm shutdown circuit which individually shutdown the drive signals of the upper arm semiconductor switching elements and the drive signals of the lower arm semiconductor switching elements in accordance with shutdown signals inputted from an exterior, and the upper arm shutdown circuit and the lower arm shutdown circuit carry out a shutdown operation in accordance with the shutdown signals, which have mutually inverted logics.