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Daimler Chrysler Ag

Ballard Power Systems Ag

Andreas Schell

Josef Sonntag

Helmut Lorenz

Axel Jansen

Ludwig Vollmer

Peter Faller

Process for electrically energizing a motor vehicle wiring circuit which has a battery, at least one electric consuming device and a fuel cell unit connected therein. The fuel cell unit is activated when the battery voltage falls below a preadjustable battery voltage limit, and when the wiring load exceeds a preadjustable vehicle wiring load; and is deactivated when the battery voltage exceeds a preadjustable battery voltage limit.

Process and apparatus for supplying electric energy to the wiring of a motor vehicle

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

A DC/DC converter which can be operated alternately as a step-up converter in a first direction of energy flow and as a step-down converter in a second direction of energy flow is disclosed. Potential isolation between the low-voltage side and the high-voltage side of the converter is achieved by a magnetic compound unit, which has not only a transformer function but also an energy store function. The converter operates as a push-pull converter in both directions of energy flow. The DC/DC converter can be used for example in motor vehicles with an electric drive fed by fuel cells.

Bidirectional DC/DC converter with a step-up mode in one direction and a step-down mode in the other direction

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Stuttgart, Germany

Andreas Schell