Ballard Power Systems Ag

Nucellsys Gmbh

Axel Jansen

Josef Sonntag

Hubert Urban

Andreas Schell

Steffen Paul

Jesef Sonntag

Jens Mueller

Peter Faller

The invention relates to a method and apparatus for controlling and for setting the switching states of switches which are connected to the electrical poles or outputs of a fuel cell and which are followed by a network, which is fed from the fuel cell, and has loads. The invention is preferably suitable for use in a vehicle. The switches are opened if the fuel cell and/or the vehicle assume critical states.

Method and arrangement for controlling a switching connection between the electrical outputs of a fuel cell and an isolated electrical network

The present invention relates to a circuit arrangement for a composite fuel cell system comprising a plurality of individual fuel cells connected in series, the voltage of the individual fuel cells being monitored, in which case components are present which enable the individual fuel cells to be bridged in the sense of a low-resistance parallel circuit. Furthermore, the invention relates to a method for operating a circuit arrangement of this type, in which case the fuel cells are bridged if the magnitude of their voltage falls below a specific threshold value or if the sign of their voltage has changed relative to normal operation, or alternatively in which case the components are controllable switches which are driven if the composite fuel cell system is intended to be discharged.

Circuit system for an integrated fuel cell system

A circuit arrangement for supplying electrical energy to a power supply has a fuel cell and an accumulator arrangement. Electrical energy is delivered by the accumulator arrangement during the starting procedure, and is fed into the power supply by the accumulator arrangement via at least one DC/DC converter during starting of the circuit arrangement.

Circuit arrangement for supplying electric power to a network comprising a fuel cell and an accumulator system

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Ulm, Germany

Axel Jansen