Robert Boschgmbh

Stefan Koch

Peter Buerk

Jian Tian

Ralf-Peter Bergmann

Karl-Heinrich Preis

Michael Soellner

Rolf Mack

Stephan Mueller

Rolf Kremser

Martin Kessler

Thomas Weigold

Nikolas Haberl

Joerg Wolf

Patric Kahles

Michael Koerner

Klaus Eckert

Stefan Kotthaus

Volker Lurk

Stephan Binhack

Gerhard Kolberg

Harald Buhren

Ernst Damerau

Arno Pruellage

Florian Lieblang

Tobias Pristl

Michael Zeller

Karl Preis

Ralf Bochat

Rob Millar

Adrian Mitcham

Eric Hueckel

Jorg Holzberg

Chris Cummaudo

The invention relates to a voltage converter () for a motor vehicle. Said voltage converter () comprises a transformer () and a power output stage (). The power output stage () comprises at least two semiconductor switches () that are connected to the transformer (), in particular to a primary winding () of said transformer (). The voltage converter () has a driver stage () which is connected, on the output side, to a control connection of the semiconductor switch () and which is designed to actuate said semiconductor switch () using a control signal (), for the purpose of generating an alternating voltage. According to the invention, the driver stage () is connected, on the input side, to a pulse signal generator () and an input capacitor (). The pulse signal generator () is designed to generate a pulse signal () and to actuate the driver stage () using the pulse signal () in order to generate the control signal (). For at least one incipient half-wave of the alternating voltage, the pulse signal () has at least one prepulse and one main pulse that generates the half-wave, the prepulse being designed to preload the input capacitor () of the driver stage () such that complete switching of the semiconductor switch () can occur more quickly than it could without a prepulse.

Voltage converter for a motor vehicle

The invention relates to an activation apparatus () for a galvanically decoupled direct voltage converter having a synchronous rectifier, comprising a signal generating device (), which is designed to generate control signals () for switch devices of the synchronous rectifier and a reference current signal (), a first comparator device (), which is coupled to the signal generating device (), and which is designed to detect the secondary-side output current (Jo) of the synchronous rectifier, compare it to the reference current signal () and generate a current control signal in dependence on the comparison, and a pulse width modulation device (), which is coupled to the signal generating device () and the first comparator device () and which is designed to generate pulse width modulated activation signals () for the switch devices of the synchronous rectifier on the basis of the control signals () and the current control signal, wherein the signal generating device () is furthermore designed to reduce the reference current signal () within a first predetermined timespan to a predetermined reference current threshold.

Activation apparatus and method for activating a direct voltage converter

The invention relates to a control unit for a motor vehicle. Said control unit comprises a voltage converter which has an inlet for a direct voltage network. Said voltage converter is designed to generate a direct voltage smaller than an input voltage on the inlet for the direct voltage network and the direct voltage is emitted on the outlet side. According to the invention, the voltage converter comprises an inverter and a transformer which is connected to said inverter. Said voltage converter also comprises an inlet for a discharge signal and is designed to discharge by means of the inverter an intermediate circuit capacitor which is connected to the inlet of the direct voltage network in accordance with the discharge signal, and to reduce a working frequency of the inverter, in particular, compared to the frequency with no discharge signal.

Control unit for a motor vehicle

A DC-DC converter including a transformer having a primary-side winding and a secondary-side winding with a center tap, and a storage choke. A rectifier circuit is connected to each of the taps at the ends of the secondary-side winding and generates a rectified output voltage at a second output of said DC-DC converter. A snubber circuit is switched via the rectifier circuit and stores energy occurring in said rectifier circuit. (An actuation apparatus includes a switching time determining device designed to determine a time interval as a function of the output voltage, the charge stored in the snubber circuit and the current fluctuations of the current through the storage choke occurring as a result of the rectification. A storage signal generator generates an actuation signal for discharging the snubber circuit as a function of the determined time interval.

Actuation apparatus and actuation method for an active snubber circuit for a DC-DC converter

A fan system includes: two circuit breakers, a control module for controlling two circuit breakers, two electric motors to which their operating voltage Uis supplied via the circuit breakers, and at least one temperature sensor on a board on which the circuit breakers are located. The control module evaluates a signal Tfrom the temperature sensor, and sets the pulse duty factors TV, TVof pulsed control voltages at the circuit breakers, while taking into account this signal as well as a requested fan power, in such a way that no power loss Pexceeding a specified value occurs at any circuit breaker.

Fan system having improved availability and method for its operation

The invention relates to a control circuit for an arrangement having at least two DC motors (), which can be connected in parallel to a DC voltage system (), in particular a circuit for controlling at least two motors of a motor vehicle fan. In this case, the DC motors () can be connected to the DC voltage system (), on the one hand, during starting, jointly via in each case one series resistor () having a low resistance value and a common semiconductor switching element () and, on the other hand, during operation, via separate semiconductor switching elements (), the series circuit comprising the separate series resistors () and the common semiconductor switching element () being arranged in parallel with the separate semiconductor switching elements () for controlling the motors during operation.

Control circuit for an arrangement having at least two direct current motors that are connectable in parallel to a direct voltage system

A method for controlling a first fan motor using a first pulse width modulation signal having a first pulse control factor, and for controlling a second fan motor using a second pulse width modulation signal having a second pulse control factor, so as to bring about an overall air output according to a prespecified setpoint air output by the operation of the first and the second fan motor, a low-pass filter being provided in parallel to the fan motors in order to smooth out voltage fluctuations in voltage supply lines, wherein the first and the second pulse control factor are made available independently of each other, in order to minimize the current through the low-pass filter.

Method and control unit for controlling fan motors

A method is described for determining an operating state on triggering a fan motor, the fan motor being operated with the aid of a switching device, the switching device being activated via a pulse-width-modulated triggering signal, a pulse duty factor of the triggering signal predefining a triggering state of the fan motor, a voltage potential at the node between fan motor and switching device or a motor current being measured as a measured variable, an operating state being determined on triggering the fan motor as a function of the measured variable and the pulse duty factor.

Method and control circuit for determining an operating state when controlling a fan motor

A method for reducing line-conducted interference in a pulse width modulated triggering system of an electric motor, a triggering pulse width modulation signal having, in one clock cycle, one or more signal edges between a first signal level and a second signal level, the pulse width modulation signal being generated in such a way that at least one of the signal edges has a first segment having a first edge slope and a second segment having a second edge slope, the absolute value of the first edge slope being less than the absolute value of the second edge slope.

Method and control circuit for reducing line-bound disturbances in a pulse-width modulated control of an electric motor

The invention relates to Method to detect a sluggishness or the blocking of an electric drive (), which is triggered via a power semiconductor component (). The electric drive () can be operated in both a partial load range (PWM timing signal&#x3c;100%) as well as in a full load range (PWM timing signal=100%), but always as a function of the timing of the PWM signal (). An evaluation circuit () is connected with a micro-controller (). Pulses generated within a time interval are detected in the evaluation circuit () from the current I flowing via the first power semiconductor component () and the number of detected pulses A*, A* are compared with a to-be-expected number of pulses A, A

Method for identifying an overload current of an electric drive

The invention relates to a circuit arrangement and a method for operating an electric motor in a direct voltage source, in particular for operating a permanent-magnet-excited DC motor in the direct voltage network of a motor vehicle, having a rotary position transducer () for detecting the rotary position of the rotor (), and having an electronic commutation controller () for switching over the current in the armature winding of the stator () as a function of the position of the rotor (). It is proposed that the rotary position transducer () is positioned relative to the stator () for an early commutation, and that the actual commutation time can be set by means of a delay correction, ascertained by measurement separately for each motor (), in the electronic commutation controller ().

Circuit arrangement and method for operation of an electric motor in a DC supply network

A system for protecting a power semiconductor output stage that, as a function of a control signal, connects an inductive load to a direct-current supply voltage and disconnects it therefrom. Protection from the induced voltages is achieved, without a freewheeling diode, in that the disconnection energy occurring at the inductive load upon disconnection can be transferred in transformer fashion to an additional inductance that is loaded with a resistance or is coupled in the countercurrent direction to the direct-current supply voltage.

System for protecting a power semiconductor output stage that switches an inductive load

An electronically commutatable motor, in particular for a fluid pump, includes excitation windings that may be connected to and disconnected from a DC supply voltage via semiconductor switches that are controlled by control signals of a commutation device. Additional closed- and/or open-loop control of the output of the motor, is obtained with a temperature protection system in that the control signals of the commutation device are clocked by pulse width modulatable output signals of a PWM generator and in that the pulse width ratio of the output signals of the PWM generator may additionally be modified as a function of the output signal of the temperature sensor.

Electronically commutable motor, in particular, for a liquid pump

An electronic circuit which has a voltage terminal, a switch, a voltage stabilizer and a computer. In addition, an interface terminal is provided, via which the computer can exchange data via an interface. After a supply voltage is applied at the voltage terminal, the switch ( ) is initially closed so that the circuit has an extremely low quiescent current. A signal at the interface terminal causes the switch to close and the voltage stabilizer and the computer are activated.

Low power circuit for waking from a sleep mode by using a remote power-on signal

In a pump, particularly for cooling water, with an impeller wheel ( ) that is supported so that it can rotate in a pump chamber ( ), an excitation device ( ) for driving the impeller wheel ( ) to rotate, and a control circuit ( ) for the excitation device ( ), the control circuit ( ) and the excitation device ( ) are thermally separated from one another by the pump chamber ( ). The waste heat of the excitation device ( ) is removed by the fluid circulating in the pump chamber ( ) to the extent that the control circuit ( ) is prevented from overheating.

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Kappelrodeck, Germany

Stefan Koch