Patent ID: 7515439

Claim:
A circuit to convert a DC voltage received at a DC input to an AC voltage, comprising: a first series circuit connected in parallel with said DC input and comprising first and second switches and a first transformer primary; a second series circuit connected in parallel with said DC input and comprising third and fourth switches and a second transformer primary; a capacitor connected between a first node within said first series circuit and a second node within said second series circuit, wherein said first node is between said first transformer primary and said secondary switch, and wherein said second node is between said third switch and said second transformer primary; a third node within said first series circuit and a fourth node within said second series circuit are connected together, wherein said third node is between said first switch and said second switch, and said fourth node is between said third switch and said fourth switch; and at least one of transformer secondaries magnetically coupled to said first transformer primary and said second transformer primary and providing said AC voltage.