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K. Edelmoser:
"Optimized Solar Inverter Power Stage";
Talk: PCIM, Nürnberg; 2004-05-25 - 2004-05-27; in: "Proceddings of the International Conference Power Electronics Intelligent Motion Power Quality", 310, (2004), ISBN: 3-928643-39-8; 310 - 313.

Conventional inverters used in power grid
connected applications fight with the
disadvantage of the hard switched PWM
power stage. Also soft switching topologies do
not give full benefits at all [1]. A simple
modification in the inverters output section can
lead to a significant improvement of the losses
in the system. Only four additional components
(two diodes and two power switches) are
necessary to optimize the power stages for
usage in a mains coupled inverters. The
topology presented in this paper shows a
remarkable improvement of the switching
losses and significantly reduced EMC. It is well
suited for solar power inverter applications.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04967512