Gec Alsthom Transport Sa

Alcatel Alsthom Compagnie Generale D'electricite

Jean-Paul Lavieville

Thierry Meynard

Philippe Carrere

Juan Gonzalez

Olivier Bethoux

Jean-Luc Thomas

Didier Muller

A multilevel converter including, in particular, a capacitor for each of its cells, and control means comprising means for evaluating the mean voltage across the terminals of each of the capacitors, means for measuring any difference on each of said capacitors between the evaluated mean charge voltage and the nominal mean charge voltage of the capacitor, and additional control means changing the time positions of the converter control signals in a direction such that the measured difference is reduced.

Electrical circuit for converting electrical energy having capacitors

Multi level power converter with self-correcting capacitor charge timing

The control path of the switch (I) comprises an input stage (T2, T1) having an input (H) coupled to the input (E) for the control signal and having its output coupled to the control electrode (G) of the switch (I). A protection circuit (D1, Z2) coupled between the load (C) and the control path includes a threshold effect component (Z2) and a decoupling element (D1). On being made conductive by the current that results from a surge generated in a circuit of the load (C), the protection circuit (D1, Z2) is coupled to the input (H) of said input stage (T2, T1) to act on said switch (I) in the same way as a control signal for the switch (I). In this manner, the control path prevents current in the load (C) from dropping off suddenly.

Control circuit for an electronic switch, and a switch constituting an

Electronic circuit for converting electrical energy

Electronic circuit for converting electrical energy, and a power supply

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Gif sur Yvette, France

Jean-Paul Lavieville