Method for converting an electric input DC voltage (U ZKL) into an AC voltage (U NETZ) by means of a switch assembly, to which belong a full-bridge circuit connected to the input DC voltage and comprising two half-bridges (13, 14) which are parallel to each other and each have a first switching element (S 1, S 3) and a second switching element (S 2, S 4) that is connected in series to said first switching element (S 1, S 3), flyback elements (D 1 -D 6; D 13) defining flyback paths and at least one storage throttle which is connected to a bridge tap and to an AC voltage terminal, wherein the switching elements (S 1 -S 4) are actuated, depending on the polarity of the half-waves of the AC voltage (U NETZ), with a defined pulse pattern in such a way that in a normal operating mode, during a half-wave respectively one first switching element (S 1; S 3) of one of the half-bridges (13; 14) is high-frequency pulsed while the second switching element (S 4; S 2) of the other half-bridge (14; 13) is closed and the other switching elements are open, as a result of which, on closing the first switching element (S 1; S 3), a magnetising current for the storage throttle is provided on closing the first switching element (S 1; S 3) via said first switching element (S 1; S 3) and on opening the first switching element a flyback current of the storage throttle flows through selected flyback elements (D 2; D 4), characterised by the steps: - Connecting a voltage converter device, which in operation generates from the input voltage (U ZKL) a potential of greater absolute value (U ZKH) and connecting at least one actuatable switching means (S 5; S 6) in a voltage converter path (37; 38) extending in a bypass to at least one of the high-frequency pulsed first switching elements (S 1; S 3), - Capturing operating conditions to determine whether the throttle is sufficiently magnetisable on application of the pulse pattern, and - in case it is determined that the throttle is not or insufficiently magnetisable, Closing the previously high-frequency pulsed first switching element (S 1; S 3) and high-frequency pulsing the actuatable switching means (S 5; S 6) in the voltage converter path (37; 38), as a result of which a magnetising current caused by the potential of greater absolute value (U ZKH) of the voltage converter device is fed to the storage throttle by the switching means (S 5; S 6) while bypassing the first switching element (S 1; S 3), while in the flyback phases the flyback current flows through the first switching element (S 1; S 3). - Connecting a voltage converter device, which in operation generates from the input voltage (U ZKL) a potential of greater absolute value (U ZKH) and connecting at least one actuatable switching means (S 5; S 6) in a voltage converter path (37; 38) extending in a bypass to at least one of the high-frequency pulsed first switching elements (S 1; S 3), - Capturing operating conditions to determine whether the throttle is sufficiently magnetisable on application of the pulse pattern, and - in case it is determined that the throttle is not or insufficiently magnetisable, Closing the previously high-frequency pulsed first switching element (S 1; S 3) and high-frequency pulsing the actuatable switching means (S 5; S 6) in the voltage converter path (37; 38), as a result of which a magnetising current caused by the potential of greater absolute value (U ZKH) of the voltage converter device is fed to the storage throttle by the switching means (S 5; S 6) while bypassing the first switching element (S 1; S 3), while in the flyback phases the flyback current flows through the first switching element (S 1; S 3).