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K. Edelmoser, F. Himmelstoß:
"High Efficiency DC-to-AC Power Inverter";
Talk: Electrical Drives and Power Electronics Conference (EDPE), Dubrovnik, Croatia; 2005-09-26 - 2005-09-28; in: "Proceedings of the 18th International Conference on Electrical Drives and Power Electronics EDPE 2005", (2005), ISBN: 953-6037-43-2; 5 pages.

In case of medium voltage (several tens up to hundred volts on DC-side) solar inverter
applications, a DC-to-DC converter for voltage level adaptation is required in series of the DC-to-
AC inverter. This leads to a two-stage concept with accumulation of the losses. In our case a concept
was chosen where the efficiency in each stage is maximized by using the best 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 inverter´s output section leads 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 inverter´s power stage. The topology presented here
shows a remarkable improvement of the switching losses and significantly reduced EMC. It is wellsuited
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=AC05935885