An electrical DC-to-AC power conversion apparatus is disclosed that is
primarily intended for use with solar photovoltaic sources in electric
utility grid-interactive applications. The invention improves the
conversion efficiency and lowers the cost of DC-to-AC inverters. The
enabling technology is a novel inverter circuit topology, where
throughput power, from DC source to AC utility, is processed a maximum of
11/2 times instead of 2 times as in prior-art inverters. The AC inverter
output configuration can be either single-phase, split-phase or
poly-phase.