Patent ID: 7605497

Claim:
A two-source inverter system, the system comprising: a first voltage source; a second voltage source; a first switch set having first DC inputs, first AC outputs, and first control inputs, wherein the first DC inputs are coupled to the first voltage source, and wherein the first AC outputs are configured to be coupled to an AC multi-phase load; a second switch set having second DC inputs, second AC outputs, and second control inputs, wherein the second DC inputs are coupled to the second voltage source, and wherein the second AC outputs are configured to be coupled to the AC multi-phase load; and a controller coupled to the first control inputs and the second control inputs, the controller being configured to receive first feedback signals and second feedback signals from the first switch set and the second switch set respectively, and the controller being configured to control current flow through the first switch set and the second switch set; wherein the second switch set comprises: a first DC node corresponding to one of the second DC inputs; a second DC node corresponding to one of the second DC inputs; a plurality of AC nodes each corresponding to one of the second AC outputs respectively; a plurality of switches each having a switch first end connected to the first DC node and a switch second end connected to one of the plurality of AC nodes respectively; a capacitor having a first end connected to the first DC node and a second end connected the second DC node; a plurality of diodes each connected between the switch second end of one of the plurality of switches and one of the plurality of AC nodes respectively; a first common node connected to each switch first end of the plurality of switches; a second common node connected to the first DC node and the capacitor first end; and a diode connected between, the first common node and the second common node.