Valeo Equipements Electriques Moteur

Laurent Domenger

Gilbert Konan

Abdelaziz Azizi Samir

Jean-François Duguey

Daniel Pereira

Son Ha Tran

Panagiotis Giannikopoulos

Hafid Ihaddaden

Charles Dumez

The invention relates to a switch system () comprising a power line () for supplying a charge from a voltage source (+Vbat), said power line having a main switch (Q) comprising a first main terminal (D) and a second main terminal (S), between which a main current (Ip) is intended to pass, and a control terminal (G) for selectively placing the main switch (Q) in a closed, open or semi-closed state, the main switch (Q) in its semi-closed state being equivalent to a variable resistor controlled by the control terminal and connected between the first and the second main terminal, characterized in that the switch system () further comprises a current-limiting device () designed to, when the main current (Ip) exceeds a maximum current threshold, decrease a control current (Ig) entering the control terminal (G), so as to cause the main switch (Q) to transition from the closed state to the semi-closed state, so as to limit the main current.

Switch system comprising a current-limiting device

The device according to the invention controls a polyphase inverter () intended for powering from a DC current source (CC) a polyphase rotating electric machine (). The device is of the type of those generating commutation functions driving commutation elements () of the inverter in such a way as to obtain a reduction of the losses in the commutation elements and a decrease of an effective current in a decoupling capacitor () of the source (CC). According to the invention, this reduction and this decrease are obtained by means of a set of control strategies () determining the commutation functions by using additional degrees of freedom of the polyphase machine () with respect to a three-phase reference machine. The polyphase machine comprises first and second phase windings forming a first three-phase system () and a second three-phase system () with distinct neutral points () offset angularly by a predetermined angle of offset (&#x398;). The first and second phase windings are linked respectively to three first and three second power arms () formed by the commutation elements.

Device for controlling a polyphase inverter

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Choisy le Roi, France

Laurent Domenger