Siemens Aktiengesellschaft

Ralf Schweigert

Albrecht Donat

Hubert Schierling

Günter Schwesig

Eric Baudelot

Bernhard Foecking

An inverter includes a mains system side freewheeling pulse converter and a load-side freewheeling pulse converter, which are electrically connected on the DC side via a DC intermediate circuit. The mains system side and load-side freewheeling pulse converters each include switchable current valves in form of semiconductor switches that are made of silicon carbide with a high blocking voltage. The inverter can operate at higher voltages and frequencies, without affecting the load rating.

Inverter with a line-side and load-side freewheeling pulse converter using SiC switching elements

To detect amplitude deviations and/or offset deviations in two sinusoidal signals (S1, S2), electrically staggered from each other by 90.degree., both signals (S1, S2) are evaluated by way of threshold stages (K11, K12, K21, K22). The zero passages of the one signal (S1, S2) each indicate trigger time points (1.sub.up, 1.sub.down, 2.sub.up, 2.sub.down) for the amplitude of the other signal (S2, S1) in each instance. The output signals (X1, X2, A, A, B, B) of the threshold stages (K11, K12, K21, K22) are analyzed in the a regulating mechanism. Regulation can take place in accordance with the errors detected.

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Adelsdorf, Germany

Ralf Schweigert