Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Renault S.a.s.

Marco Ranieri

Sylvain Bacquet

Sylvain Leirens

Marc Beranger

Diego Alberto

Christophe Dang Van Nhan

Raphaël Toufflet

Michaël Palmieri

Alexis Derbey

Benoît Morin

A control system is intended to be tailored to a fuel-cell stack. This fuel-cell stack includes a plurality of cells connected in series between a first terminal and a second terminal. This system includes a central control unit and an electronic bypass device including a plurality of separate electrical bypass units, each electrical bypass unit being connected in parallel to at least one separate cell of the fuel-cell stack, in order to control its discharge on startup and shutdown of the stack and thus to avoid the creation of inverse electrical potentials and to limit the presence of residual potentials.

Control system for discharging the cells of a fuel-cell stack

The invention relates to a device for detecting an electric arc based on an analog output signal () of at least one acoustic wave sensor (), this device including: an analog-to-digital converter () capable of sampling and digitizing the output signal () of the sensor (); a digital processing circuit () capable of implementing a frequency domain analysis of the digital output signal () of the converter () enabling to detect the possible presence of an arc based on its acoustic signature; and an analog circuit () for detecting the exceeding of a power threshold by the output signal () of the sensor (), wherein the digital processing circuit () is configured to implement the frequency domain analysis only on detection of the exceeding of a threshold by the analog circuit ().

Device for detecting an electric arc based on its acoustic signature

A system of batteries of accumulators includes electrochemical accumulators in series, a power connection connecting either a load or recharging power supply across the accumulators, a control device connected to the accumulators by the power connection, measuring circuits, each of which is attached to a respective accumulator and configured to measure voltage across its terminals, and communication circuits, each of which is attached to an accumulator and configured to induce a voltage drop across its terminals when the measured voltage crosses a threshold. The control device identifies this drop in voltage.

System of batteries of accumulators with simplified supervision

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Gieres, France

Marco Ranieri