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K. Edelmoser:
"High Efficiency DC-to-AC Power Inverter";
WSEAS Transactions on Circuits and Systems (eingeladen), Issue 5 (2004), Volume 3; S. 1108 - 1112.

In case of medium voltage (several tenth up to hundred volts on DC-side) solar inverter applications a DC-to-DC converter for voltage level adaptation is required in front of the DC-to-AC inverter. This leads to a two-stage concept with accumulation of the losses. In our case a concept has to be chosen, where the efficiency in each stage is maximized by usage of the best-fit topology. The given requirements force the application of a non-isolated design to avoid additional transformer losses. In this paper a 60V-120V DC (input) to 230V AC(output) / 1kW converter with minimal conversion losses is derived. A simple modification in the inverters output section lead to a significant improvement of the losses in the inverter system. Only three additional components (two diodes and one inductor) are necessary to optimize the inverters power stage. The topology
presented here shows a remarkable improvement of the switching losses and significantly reduced EMC. It is well suited for solar power inverter applications.
Keywords: Inverter, Solar Power, PWM, efficiency

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04968070