DC/DC CONVERTER CIRCUIT

The circuit has a converter unit (2) for converting an input voltage (VE) into an output voltage (VA) with a defined output potential and a capacitor (5) for providing an input if the input voltage fails so that the output voltage is held for a defined period. A charging circuit (4) charges the capacitance with a storage potential greater than the input voltage potential. A discharge circuit provides charge to the converter unit if the input voltage fails. An independent claim is also included for the following: (a) a method of operating an inventive circuit.