Robert Boschgmbh

Schroff Gesellschaft MIT Beschrankter Haftung

Gkr Gesellschaft Fur Fahrzeugklimaregelung Mbh

Wolfram Breitling

Norbert Knab

Reinhold Weible

Rolf Falliano

Harald Eisenhardt

Walter B Hersel

Juergen Munz

Florian Richter

Horst Singer

Jacek Mendes

Werner Sonnabend

Andrea Goeggelmann

A device for detecting a fault current in an electronic apparatus has a first and at least one second electric conductor, the first electric conductor carrying a first electric potential and the at least one second electric conductor carrying a second electric potential. The device is characterized by the fact that an electric sensing conductor having a fixed electric rest potential whose value lies between the first and the at least second electric potential is situated between the electric conductors.

Device for detecting a fault current in an electronic apparatus

A power MOS transistor having a PMT chip located in a transistor housing in which the temperature of the transistor barrier junction is monitored is described. Protection of the PMT chip against overload and permanent damage is guaranteed without negatively affecting its switching function in that a protective circuit is provided in the transistor housing which directly measures the temperature of the transistor barrier junction using a temperature measuring element, and when a predefined or predefinable limit barrier junction temperature is reached reduces the drain current and thus the power loss of the PMT chip, the temperature measuring element being integrated in the PMT chip or accommodated in the transistor housing together with the protective circuit as an additional chip.

Power MOS transistor with overtemperature protection circuit

An electronic control circuit for controlling an electromagnetic valve having an armature, in particular for a heating and/or air-conditioning system in a motor vehicle, has an electronic switching element in series with the coil of the valve and is characterized in that the switching element controls the valve voltage (or the valve current) applied to the coil so that the valve voltage reaches a first value when the valve is switched on; then the valve voltage is reduced to a second value which is lower than the first value; and thereafter the valve voltage assumes a third value which is greater than the second value and represents a holding voltage for holding the armature in its switched-on position.

Electronic control circuit

Process for detecting abutment and blocking in an electric motor

An incremental travel encoder with an encoder part (11) and a sensor part for the sake of its economical production as a set-point value controller for operator equipment in motor vehicles, such as climate control systems, the sensor part has at least one electric switch with one fixed and one movable switch element for opening and closing a circuit for generating counting pulses, and the encoder part has a plurality of indexing members, which are disposed one after the other at the interval of an increment in the direction of motion of the encoder part. Upon each increment of the encoder part, one of the successive indexing members actuates the movable switch element in the direction of a temporary opening or closure of the electric switch.

Incremental travel encoder

A multi-layer circuit board which includes at least two boards carrying conductors and a shielding foil interposed between the two boards. The circuit board is provided with a through hole including a metallic lining in electrical connection with the shielding foil. The lining includes an insulating layer on which a conductive metal layer is disposed. The metal layer, electrically separated from the lining by the insulating layer, is in electrical connection at respective ends thereof with the conductors. By virtue of this arrangement a coaxial design of a through hole results thereby permitting a total decoupling with respect to adjacent or neighboring through hole connections.

Multi-layer circuit board

To provide for starting of signal processing operations in a microprocessor (7), for example an automotive-type microprocessor, subject to frequent power interruptions, in which the processing operations are controlled by clock signals from a clock generator (1), and to insure that the microprocessor carries out its computation cycles only after the clock signal generator (1) provides clock signals at an adequate level appropriate for microprocessor operations, the level of the clock signals is sensed, for example in a peak rectifier (2, 3, 5) to reset the microprocessor when the clock signals have reached this level, thereby insuring commencing of processing cycles from a predetermined condition or state of the microprocessor at a time when adequate clock signals are available. The reset signal from the clock generator can be logically combined in a logic circuit (6) with externally generated reset signals, for example dependent on sufficient or suitable operating voltage being present for operation of the microprocessor from a power source (P), for example the battery of an automotive vehicle, to insure operation of the microprocessor only with adequate battery voltage being present, for example after termination of power drain by a starter motor.

Electronic control apparatus with defined reset function

A device is proposed for controlling the current through switching devices which function inductively, in particular magnetic valves in the fuel metering system of an internal combustion engine, with which it is possible to control the current during an attracting and maintenance phase. A primary characteristic is a bracketed and controllable constant-voltage source parallel to the base-emitter path of a switching transistor and of a measuring resistor. Furthermore, a threshold switch connected with its positive input to the measuring resistor is coupled with positive feedback, and the negative input of this threshold switch is connected to a voltage divider controllable in accordance with the input signal.

Device for controlling the current through an inductive consumer,

The resistance-inductance element used to determine the frequency of the frequency generator in the prior art circuits is replaced by an inductance-capacitance combination. As in the prior art circuits the frequency determining circuit is connected between the output and the inverting input of an operational amplifier to whose direct input a reference voltage is applied. However in the present circuit an inductance is connected from the output to the inverting input of the operational amplifier and a capacitance-resistance circuit is connected in parallel with the inductance. A capacitance connects the inverting input of the operational amplifier to ground potential. Resistors connected from the inverting input to the positive voltage supply and to the output terminal from the inverting input and from the direct input are used to change the slope of the curve of frequency vs. inductance.

Growing community of inventors

Sachensheim, Germany

Wolfram Breitling