Abstract: An electronic amplifier is characterized by a first stage (1) controlled by an input voltage UE, the operating voltage of said stage being on positive and/or negative potentials (V1+/V1A?), which are always constant with respect to the input voltage (UE), and further by a second impedance-converting stage (2), which is controlled by a voltage supplied by the first stage (1) and the operating voltage of which is on positive and/or negative potentials (V5+/V5A?), which are always constant with respect to the voltage supplied by the first stage (1).

Abstract: A circuit arrangement (1) for the regulation of a current (IL) through a load (RL) comprises: a resistance (RS), through which a load current (IL) flows and across which a voltage (VS) drops, which serves as a control variable (X) for the regulation of the load current (IL), a tapping point (P) for a reference voltage (Vref), which serves as a command variable (W) for the regulation of the load current (IL), and a differential amplifier for the amplification of the control deviation (W?X) between command variable (W) and control variable (X).

Abstract: The invention to an electronic control system, controlled by a pulse width-modulated signal (SG) related to earth, for regulating the voltage (Umot) across a high-side load (M), in particular a fan control unit for motor vehicles. The circuit part that converts the pulse width-modulated signal (SG) into the reference input variable (U?) needed for the regulation uses the positive potential of the supply voltage (V2) as reference potential, so that the reference input variable (U?) is likewise related to the positive potential of the supply voltage and the control signal (SG) is converted by means of a Zener diode (D1) and by means of a resistor (R5) connected parallel to the Zener diode (D1) into a control signal related to the positive supply potential and is further converted with a low pass filter (R7, C1) into a linear control signal, which serves as input reference variable (U?).

Abstract: The invention relates to an electronic control device for regulating the voltage across a high-side load, especially for regulating a fan in a motor vehicle, with a control voltage (V1) which is referenced to system ground and which is mirrored to the positive high-side supply voltage, wherein the control voltage (V1) is supplied to the base of a first transistor (Q1) operated in common-emitter connection, which transistor (Q1) has, in the emitter circuit, a first resistor (R1) and, in the collector circuit, a second resistor (R2) and, in series with the latter, the base-emitter diode of a second transistor (Q2). Compensation for temperature effects of the base-emitter voltage of the first transistor is performed by the base-emitter path of a second transistor of the same conductivity type in series with the first transistor.

Abstract: The invention relates to an electronic control system for controlling a voltage across a load, in particular across a fan motor of a motor vehicle, as a function of a control signal, comprising: a setting transistor, a transistor, which activates the control channel of the setting transistor, as well as two resistors, which form a voltage divider via which the voltage across the load is fed to the emitter of the transistor, wherein the control system is designed, in the absence of the control signal, to block the control channels of all the transistors of the control system for limiting the current through all the resistors of the control system, such that, in the absence of the control signal, the control system has a quiescent current consumption in the off-state current range of the transistors.

Abstract: The invention concerns an electronic module for a motor vehicle, in particular a fan regulator (4?) with a control input (S) for a signal, in particular a pulse width modulated signal, transmitted via a signal line (3). The electronic module is designed for the generation of an essentially constant potential (Ubias, Ubias?UBE) at the control input (S), which preferably is designed as a current-controlled, low resistance control input. The invention also concerns an arrangement (1?) for the transmission of a preferably pulse width modulated signal with: a control device (2?) for the generation of the signal, a signal line for the transmission of the signal, and an electronic module as described above.

Abstract: An electronic amplifier is characterized by a first stage (1) controlled by an input voltage UE, the operating voltage of said stage being on positive and/or negative potentials (V1+/V1A?), which are always constant with respect to the input voltage (UE), and further by a second impedance-converting stage (2), which is controlled by a voltage supplied by the first stage (1) and the operating voltage of which is on positive and/or negative potentials (V5+/V5A?), which are always constant with respect to the voltage supplied by the first stage (1).

Abstract: The invention to an electronic control system, controlled by a pulse width-modulated signal (SG) related to earth, for regulating the voltage (Umot) across a high-side load (M), in particular a fan control unit for motor vehicles. The circuit part that converts the pulse width-modulated signal (SG) into the reference input variable (U?) needed for the regulation uses the positive potential of the supply voltage (V2) as reference potential, so that the reference input variable (U?) is likewise related to the positive potential of the supply voltage and the control signal (SG) is converted by means of a Zener diode (D1) and by means of a resistor (R5) connected parallel to the Zener diode (D1) into a control signal related to the positive supply potential and is further converted with a low pass filter (R7, C1) into a linear control signal, which serves as input reference variable (U?).

Abstract: The invention relates to a coolant circuit (5, 6, 7, 7a, 8, 8a), preferably for cooling a drive or an engine (2) of a motor vehicle (1), in particular of a passenger car, comprising: a controller (8) which, in order to control the temperature of a cooling fluid (7a), activates an electrically operated fan motor (5). The controller (8) is in thermal contact with the cooling fluid (7a) in order to be cooled and is formed to detect the temperature of the cooling fluid (7a) by way of a temperature sensor (8a) which is preferably provided at the controller (8). A defined temperature of the cooling fluid (7a) can thereby be set without a control signal from a master control or regulating device being required for this purpose.

Abstract: The invention relates to an electronic control device for regulating the voltage across a high-side load, especially for regulating a fan in a motor vehicle, with a control voltage (V1) which is referenced to system ground and which is mirrored to the positive high-side supply voltage, wherein the control voltage (V1) is supplied to the base of a first transistor (Q1) operated in common-emitter connection, which transistor (Q1) has, in the emitter circuit, a first resistor (R1) and, in the collector circuit, a second resistor (R2) and, in series with the latter, the base-emitter diode of a second transistor (Q2). The invention makes it possible to construct a control device, especially for a fan, using comparatively few discrete components. The control device is distinguished by having good regulating behaviour and an extremely small closed-circuit current consumption.

Abstract: The invention relates to an electronic control system for controlling a voltage across a load, in particular across a fan motor of a motor vehicle, as a function of a control signal, comprising: a setting transistor, a transistor, which activates the control channel of the setting transistor, as well as two resistors, which form a voltage divider via which the voltage across the load is fed to the emitter of the transistor, wherein the control system is designed, in the absence of the control signal, to block the control channels of all the transistors of the control system for limiting the current through all the resistors of the control system, such that, in the absence of the control signal, the control system has a quiescent current consumption in the off-state current range of the transistors.

Abstract: The invention concerns a circuit arrangement (2) for the regulation of a current (IL) through a load (RL), with: a resistance (RS), through which a load current (IL) flows and across which a voltage (VS) drops, which serves as a control variable for the regulation of the load current (IL), a tapping point (P) for a reference voltage (Vref), which serves as a command variable for the regulation of the load current (IL), and a differential amplifier for the amplification of the control deviation (Vref?VS).

Abstract: A circuit arrangement (1) for the regulation of a current (IL) through a load (RL) comprises: a resistance (RS), through which a load current (IL) flows and across which a voltage (VS) drops, which serves as a control variable (X) for the regulation of the load current (IL), a tapping point (P) for a reference voltage (Vref), which serves as a command variable (W) for the regulation of the load current (IL), and a differential amplifier for the amplification of the control deviation (W?X) between command variable (W) and control variable (X).

Abstract: The invention concerns an electronic module for a motor vehicle, in particular a fan regulator (4?) with a control input (S) for a signal, in particular a pulse width modulated signal, transmitted via a signal line (3). The electronic module is designed for the generation of an essentially constant potential (Ubias, Ubias?UBE) at the control input (S), which preferably is designed as a current-controlled, low resistance control input. The invention also concerns an arrangement (1?) for the transmission of a preferably pulse width modulated signal with: a control device (2?) for the generation of the signal, a signal line for the transmission of the signal, and an electronic module as described above.

Abstract: The invention relates to a motor vehicle comprising a water circuit for cooling its internal combustion engine, wherein the water circuit comprises an electrically operated engine fan and the engine fan is assigned a linear regulator which is thermally coupled to the water circuit.

Abstract: An electronic current limiting device is provided in voltage or current controllers for loads with non-linear current-voltage characteristics. Load current is limited depending on load voltage. A current limiting line features non-linear behaviour with at least two different gradients section wise, which are neither zero nor infinite.

Abstract: A switching voltage converter in half bridge topology includes a control circuit for achieving a constant locking time for two power switches to switch between a TOP position and BOT position. The TOP switch is realized by one or more parallel-switched n-channel transistors and the BOT switch 3 is realized by one or more parallel-switched p-channel transistors. Both of the power switches are controlled by a gate driver. The reference potential of the gate driver is at the potential of the output signal Uout of the half bridge. The driver is controlled by a switching-signal producing unit at the same reference potential as the driver 1, whereby unit and driver can be directly connected to each other.

Abstract: A switching voltage converter in half bridge topology operates in switching mode with variable locking, consisting of two power switches, and one control circuit. The TOP switch is realized by one or more n-channel transistors. The BOT switch is realized by one or more p-channel transistors. The output Upwm of the half bridge is selected as a reference potential, which is not constant and varies during operation, for the control circuit and supply voltage Ubtop, Ubbot of the drivers of the TOP and BOT switch.

Abstract: A switching voltage converter in half bridge topology includes a control circuit for achieving a constant locking time for two power switches to switch between a TOP position and BOT position. The TOP switch is realized by one or more parallel-switched n-channel transistors and the BOT switch 3 is realized by one or more parallel-switched p-channel transistors. Both of the power switches are controlled by a gate driver. The reference potential of the gate driver is at the potential of the output signal Uout of the half bridge. The driver is controlled by a switching-signal producing unit at the same reference potential as the driver 1, whereby unit and driver can be directly connected to each other.

Abstract: A switching voltage converter in half bridge topology operates in switching mode with variable locking, consisting of two power switches, a series-pass element, and one control circuit. The TOP switch is realized by one or more n-channel transistors. The BOT switch is realized by one or more p-channel transistors. The output Upwm of the half bridge is selected as a reference potential, which is not constant and varies during operation, for the control circuit and supply voltage Ubtop, Ubbot of the drivers of the TOP and BOT switch.