Robert Boschgmbh

Roman Gronbach

Bernd Dittmer

Richard Schoettle

Reinhard Rieger

An electrical full bridge circuit configuration having a bridge circuit, in the bridge branches of which electrical switch elements are situated, and having at least one bridge cross branch for connecting an electric motor that is switchable in its direction of rotation, in particular in an electrical system of a motor vehicle, and having a protective switch element for protecting against inadmissibly high electrical currents, in particular short circuit currents. For this purpose, the switch elements are provided as formed from switch contact elements of at least one relay.

Electrical full bridge circuit configuration

A DC-voltage vehicle electrical system for a motor vehicle, having a current source and a user. The DC-voltage vehicle electrical system is preferably developed as a 42V multi-voltage vehicle electrical system. A device for the cyclical interruption of the current is provided in the DC-voltage vehicle electrical system, in order to prevent the formation of arcs during switching and plugging procedures under a load at the DC-voltage vehicle electrical system or to end rapidly the formation of arcs, in a simple manner and without expensive constructive or switching technology measures.

DC-voltage vehicle electrical system

A step-down constant-current transformer including a controllable switch downstream from the one input and connected in series to a choke, a capacitor connected in parallel at the output, and upstream from the choke, a second controllable switch in parallel. Both controlled switches are MOSFET transistors. A control unit, in particular a pulse-width control unit, is provided for the MOSFET transistors. The voltage across the parallel-connected MOSFET transistor is monitored to determine whether a reverse current, i.e., a current flowing through the choke from the output in the direction of the input of the constant-current transformer, or an electric potential at the center tap of the half-bridge formed by the two MOSFET transistors is detected. For this purpose, a comparator and an AND circuit are provided, which, in the event of such a reverse current, block the parallel-connected MOSFET transistor to prevent the reverse current.

Step-down constant-current transformer

The invention relates to a device for generating a regulating signal for a direct voltage converter. The device has a voltage regulator and a current regulator at whose output the regulating signal can be tapped. Between the voltage regulator and the current regulator, a limiter is provided, which serves to limit the output signal of the voltage regulator. The limiter has an input connection which can be used to supply it with a predeterminable limit value signal for the current reference value.

Device for generating an adjustment signal for a D.C. converter

The invention concerns a method and a device for controlling the parallel operation of multiple d.c. voltage converters. One of these d.c. voltage converters performs a master function and works with voltage regulation. The other d.c. converters perform a slave function and serve as pure current sources. The d.c. voltage converter serving as the master with voltage regulation usually makes its half nominal current available during operation. It is therefore capable of rapidly correcting short-run load variations in the positive as well as the negative direction due to its control reserves.

Method and device for controlling the parallel operation of dc converters

Apparatuses and methods are disclosed for controlled parallel operation of direct current converters, particularly in a multi voltage vehicle electrical system, with two voltage ranges (U,) and (U,). The parallel-connected voltage converters are disposed between the voltage ranges; in this connection, only one of the voltage converters is embodied as an active voltage regulator that functions all the time. The other (n&minus;1) converters function either in full load operation or no load operation depending on the required power demand.

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Korntal, Germany

Roman Gronbach