Fronius International Gmbh

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Walter Pammer

Günter Achleitner

Stephan Holzinger

The invention relates to a method and to an apparatus for protecting transistors (S, S; S, S) arranged in at least one path, wherein transistors (S, S; S, S) connected in series to which an input voltage (Ue) is applied are arranged in a path (), and the transistors (S, S; S, S) of a path are alternately switched between a conductive state and a blocking state in order to generate an output voltage (Ua) at the center of the path. In order to prevent both transistors (S, S; S, S) of a path from triggering, the blocking state of the second transistor (S; S) of the path is checked before switching a transistor (S; S) into the conductive state, and the switching is released by way of a signal generated during the check.

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Wartberg/Aist, Austria

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