K.H. Edelmoser and H. Ertl (Austria)
EMI-Reduction, Inverter, Switching Leg, Solar Energy, PWM, Losses
Conventional power inverters used in mains connected applications fight with the disadvantage of the hard switched PWM power stage. Alternatively, also soft switching topologies would not give full benefits. A simple modification in output section of a hard-switched topology, however, can lead to a significant improvement of the system losses. Only two additional components (diodes) 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 as well as a significantly enhanced EMC. Consequently, it is well suited for solar power inverter applications.
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