Patent ID: 8891253

Claim:
An inverter connectable to an electricity mains, the inverter comprising: a DC to DC current fed push-pull converter operable to generate a current waveform from a DC voltage source, the current waveform being substantially synchronized to the electricity mains, the DC to DC current fed push-pull converter including a transformer having a primary side connectable to the DC voltage source and a secondary side connectable to the mains, wherein the primary side has a first primary winding and a second primary winding, each of which has a first side connected to ground via a respective switching transistor directly connected to ground, and a second side connected to a synchronous buck converter which is fed by the DC voltage source, the synchronous buck converter including an inductor and a buck-boost circuit having a pair of transistors, wherein respective voltage clamps are connected between the first sides of the first and second primary windings and the respective switching transistors, each of the voltage clamps commutating current from the respective first and second primary windings of the primary side of the transformer when the respective switching transistor is turned off, and wherein the buck-boost circuit is controlled such that the pair of transistors is operated only when an output line voltage is equal to or less than n*Vbat, where ‘n’ is the number of turns ratio of the transformer and ‘Vbat’ is the voltage of the DC voltage source.