a starting circuit for an inverter includes , at least , a control winding provided in connection with a saturable magnetic core of an input transformer of the inverter , a transistor and a capacitor . when a dc voltage source is activated , a discharge current of the capacitor flows through the collector - emitter circuit of the transistor and the control winding so as to start the switching operation of the inverter . a control circuit is provided for detecting a secondary voltage of the inverter so as to cut off the operation of the starting circuit after the inverter starts .