An inverter circuit according to an embodiment includes an input unit to which a first voltage is applied. In the inverter circuit, a transformer transforms the first voltage output from the input unit, and a first switching unit switches an on/off state of the transformer. An inverter controller controls an operation of the first switching unit, and an output unit of the inverter circuit outputs a second voltage output from the transformer. A feedback unit detects an electrical signal from the transformer and supplies the detected electrical signal to the inverter controller, and an initial operation controller controls an intensity of the electrical signal supplied to the inverter controller from the feedback unit.