An inverting converter circuit having an input terminal to receive an input DC voltage at a first voltage level and having an output terminal to provide an output DC voltage at a second voltage level to a load, comprising: a first inductor connected to the input terminal; a second inductor connected to the output terminal; a capacitor connected between the first inductor and the second inductor in series; a switch coupled between a first circuit point and a second circuit point, the first circuit point joining the first inductor and the capacitor, the second circuit point being preferably ground; a first current flow path when the switch is in an on-state, the first current flow path bypassing the load; a second current flow path when the switch is in an off-state, the second current flow path including a unidirectional current conducting device connected between a third circuit point and the second circuit point, the third circuit point joining the capacitor and the second inductor; and a control circuit coupled to the switch and configured to receive signals related respectively to a load parameter, current through the switch when the switch is in the on-state and current through the unidirectional current conducting device when the switch is in the off-state, and in response, controlling the state of the switch, wherein the control circuit initiates the off-state switch condition when the switch current attains a prescribed level, and the control circuit comprises a delay circuit for maintaining the off-state of the switch for a fixed time period, wherein the control circuit initiates transition of the switch from off-state condition to the on-state condition after the fixed time period when the load parameter exceeds a threshold level, and wherein said transition is inhibited when the current through the unidirectional current conducting device is at an excessive level. a first inductor connected to the input terminal; a second inductor connected to the output terminal; a capacitor connected between the first inductor and the second inductor in series; a switch coupled between a first circuit point and a second circuit point, the first circuit point joining the first inductor and the capacitor, the second circuit point being preferably ground; a first current flow path when the switch is in an on-state, the first current flow path bypassing the load; a second current flow path when the switch is in an off-state, the second current flow path including a unidirectional current conducting device connected between a third circuit point and the second circuit point, the third circuit point joining the capacitor and the second inductor; and a control circuit coupled to the switch and configured to receive signals related respectively to a load parameter, current through the switch when the switch is in the on-state and current through the unidirectional current conducting device when the switch is in the off-state, and in response, controlling the state of the switch, wherein the control circuit initiates the off-state switch condition when the switch current attains a prescribed level, and the control circuit comprises a delay circuit for maintaining the off-state of the switch for a fixed time period, wherein the control circuit initiates transition of the switch from off-state condition to the on-state condition after the fixed time period when the load parameter exceeds a threshold level, and wherein said transition is inhibited when the current through the unidirectional current conducting device is at an excessive level.