“…In [2] and [3], high efficiencies are obtained, however a DC-DC converter stage is used. In [4], [5], [6], and [7], the effect of wide input voltage ranges are specifically investigated, but once again this is done through the use of a DC-DC converter stage that steps the voltage up or down to the desired DC inverter input. In [8], [9], and [10], soft switching topologies are used to increase efficiency by reducing switching losses.…”