Abstract: A circuit configuration for supplying switchable voltage and/or current to an electrical consumer, includes a switching device, a voltage source for tapping high and low supply potentials, a driver circuit for the switching device, a lead between the voltage source and the switching device, a leakage inductance distributed to the lead, a measuring and evaluating circuit for detecting voltage deviations at input terminals of the driver circuit arising from current deviations in the leakage inductance of the lead and for evaluating the current deviations, and a feedback circuit for controlling feedback of the driver circuit to slow switching processes of the switching device whenever a value of a voltage change at the input terminals of the switching device exceeds a defined threshold value. A method for limiting a time deviation of a switching current of a consumer is also provided.

Abstract: The invention relates to a circuit arrangement for a timed power supply having an integrated circuit connected to first and second supply potential terminals and includes a switching mechanism, a control circuit that controls the switching mechanism, and a first diode. A coil is additionally provided, which is connected to the switching mechanism and to a first output terminal. A load is connected between the first output terminal and a second output terminal and a first charge storage unit is connected in parallel with the load. The switching mechanism includes a first and a second semiconductor switch. This makes possible a timed power supply that features a low power loss and a low electromagnetic radiation.

Abstract: A switched-mode power supply with a switch for applying a supply voltage to a primary coil of a transformer based on the criterion of a drive signal. A pulse-width modulator has supplied a first regulating signal that is dependent on an output voltage and a first current signal that is dependent on a voltage through the primary coil for providing the drive signal. A second regulating signal that is variable in dependency on the current through the primary coil is also supplied to the pulse-width modulator in addition to the first regulating signal and first voltage signal. A method is provided for driving the switch in a switched-mode power supply.

Abstract: A switched-mode power supply has a power regulating configuration for regulating mains current consumption, a rectifier configuration which is connected to the power regulating configuration and has output terminals at which a bus voltage is available, and a switched-mode regulator is connected to the output terminals of the rectifier configuration and an output voltage VOUT can be tapped off at its output terminal. Both the bus voltage and the output voltage are fed back via feedback paths to the power regulating configuration.

Abstract: The circuit configuration provides an at least approximately load-independent DC voltage. The circuit includes a current control assembly for controlling the mains current consumption, having an AC voltage terminal at which the mains voltage is received and two output terminals. A rectifier assembly is connected to the output terminals of the current control assembly and has output terminals to which the DC voltage is applied. A voltage measurement arrangement, for providing a voltage signal at an output terminal is connected to the output terminals of the rectifier assembly. A feedback branch has a voltage control assembly for feeding the voltage signal back to the current control assembly.

Abstract: A power supply for supplying a main electrical circuit during normal operation and an auxiliary electrical circuit during standby operation, includes a switched power converter, which is connected between an input voltage and the main electrical circuit and has an inductor, a controllable switch, a first rectifying unit and a control unit for the switch. A second rectifying unit couples the voltage dropping across the inductor into the auxiliary electrical circuit. During standby operation, the control unit controls the switch in such a way that the switched power converter is operated in resonance mode.

Abstract: A clamping circuit is described which prevents an input signal present on an input path from being able to assume a negative potential. The circuit is distinguished by a high voltage endurance in conjunction with accurate adherence to the clamping voltage and, at the same time, a low current consumption in the normal mode. The clamping circuit contains cross-coupled first and second transistors and can be changed over from a normal mode to a clamping mode if the voltage of the input signal falls below a predetermined clamping voltage, preferably 0 V. For this purpose, a third transistor is provided, which is connected into the input path in such a way that it is in a reverse conducting state in the clamping mode of the circuit and in a forward blocked state in the normal mode.

Abstract: An overload protection circuit for a power switch has a delay element by means of which the voltage which is dropped across the power switch, the supply voltage and a temperature margin are evaluated in comparison with a maximum permissible depletion layer temperature. In the practical embodiment, a capacitor is provided which is charged and discharged by suitably controlled current sources. A disconnect signal for switching the power switch is produced by comparing the capacitor voltage with the temperature margin. The circuit ensures a safe disconnection in the event of a short condition in the load, even in the case of a periodic switching operation of the power switch.

Abstract: A thermal protection circuit having a reduced current consumption and requiring a reduced number of components, includes a first, a second, and a third current source. The third current source has a first transistor with an emitter connected to a first voltage supply terminal, a collector, and a base connected to the collector of the first transistor, and has a second transistor with a base, a collector connected to the collector of the first transistor and to the base of the first transistor. A voltage divider has a tap, a first voltage divider terminal connected to a second voltage supply terminal, and a second voltage divider terminal connected to the third current source. A third transistor has an emitter connected to the second voltage supply terminal, a collector connected to the first current source, and a base connected to the tap of the voltage divider. A temperature-dependent switching signal can be tapped at the collector of the third transistor.

Abstract: The circuit configuration is used to drive an electrical drive unit. The circuit has a voltage source and a control circuit for voltage commutation connected between the voltage source and the electrical drive unit. In addition, the circuit includes a temperature evaluation circuit that monitors the temperature of the control circuit. The temperature evaluation circuit uses the motor current of the electrical drive unit to determine the housing temperature of the power switch which has the greatest load.

Abstract: The circuit configuration produces a load-independent DC voltage. A mains current input is controlled by a current control configuration. A function generator produces an output signal depending on an input signal according to a function y =f(x). The function generator is contained in a feedback branch from a voltage measurement configuration, which measures an output voltage, to the current control configuration. The derivative of the function f(x) depends on the input signal, and the derivative rises at least in sections with an increasing input signal.

Abstract: The present invention relates to a current limiting circuit for controlled semiconductor power components, in particular to a current limiting circuit for power transistors which is independent of its voltage supply. A current limiting circuit for controlled semiconductor power components, in particular for power transistors, with a sense resistor, which is connected in series with the main current path of the controlled semiconductor power component, generating a voltage drop proportional to the current through the controlled semiconductor power component. A current mirror circuit device has a first current source device for generating a first current between a first and a second reference-ground potential. A second current source device generates a second current between the control potential of the control terminal of the semiconductor power component and a third reference-ground potential.

Abstract: A circuit configuration for a charge pump includes a first series circuit of n integrators and a second series circuit of n further integrators that are connected up to one another via feedback paths. The individual integrators may be configured in the form of controllable integrators which, when used in a voltage regulator circuit, are set depending on the output signal of a regulating amplifier. In particular, the frequency of the charge pump can be adapted in a load-dependent manner with the aid of the controllable integrators.

Abstract: A circuit for producing a reference voltage produces the reference voltage by adding a number of forward voltages across corresponding pn junctions through which current flows, and a difference formed by two intermediate circuit voltages and multiplied by a corresponding factor. The two intermediate-circuit voltages correspond to summed voltages formed by a number of forward voltages across pn junctions which have different current densities flowing through them. In addition, the use of a corresponding compensation device makes it possible to compensate for a persistent parabolic temperature dependency of the resultant reference voltage.

Abstract: In a system for contactless power and data transmission, a transmitting or receiving station has at least one transmitting or receiving resonant circuit which is driven by an integrable control circuit. The integrated control circuit has a multiplicity of capacitors which can be switched in, in parallel with the resonant circuit. A device is provided for driving the switching device.

Abstract: A circuit configuration for generating a controlled output voltage from an uncontrolled input voltage, includes an input terminal for supplying the uncontrolled input voltage, and an output terminal for pickup of the controlled output voltage. A transistor has a load current path being connected between the input terminal and the output terminal. A controlled-gain amplifier has an input terminal for receiving the controlled output voltage and has an output terminal. A capacitor couples the output terminal of the controlled-gain amplifier with a control terminal of the transistor. A current source for discharging the capacitor is controllable by the controlled-gain amplifier. A charge pump has an output terminal for an increased voltage being connected to the control terminal of the transistor, for supplying an output voltage being controllable by the controlled-gain amplifier.

Abstract: A circuit configuration for limiting an output voltage of a clocked voltage regulator includes a control unit receiving a direct voltage to be regulated and having an output for supplying an output voltage. A voltage regulating amplifier is constructed as an integrator, receives the output voltage and a reference voltage, and supplies an output signal. A current threshold generator detects a current intensity of the integrator and supplies an output signal. A multiplier multiplies the output signal of the current threshold generator by the output signal of the voltage regulating amplifier and a signal obtained from the direct voltage to be regulated and supplies an output signal. A current regulating amplifier receives the output signal of the multiplier and a signal obtained from the direct voltage to be regulated and supplies an output signal. A driver stage converts the output signal of the current regulating amplifier into a trigger signal for the control unit.

Abstract: A protective circuit configuration for a power transistor having a load circuit and a control terminal includes an inductive load connected into the load circuit of the power transistor. A further transistor has a control terminal and has a load path connected between the load path and the control terminal of the power transistor. A control device is supplied by a voltage applied to the load path of the power transistor. The control device generates a control signal from the voltage applied to the load path of the power transistor for delivering the control signal to the control terminal of the further transistor.

Abstract: A comparator circuit includes first and second transistors of one conduction type having bases receiving input signals, collectors with leads being connected to a first pole of a supply voltage source, and coupled emitters. A resistor is connected into the collector lead of one of the first and second transistors of the one conduction type. A transistor of another conduction type has a base-to-emitter path connected parallel to the resistor and a collector issuing an output signal. A current impressing device is connected between the coupled emitters of the first and second transistors of the one conduction type and a second pole of the supply voltage source. The current impressing device impresses a current at every operating temperature being equal to twice the quotient of the base-to-emitter voltage of the transistor of the other conduction type and the resistor.

Abstract: A circuit configuration for a controlled blocking oscillator converter switching power supply includes an electric switch having a duty cycle. A transformer has a primary winding connected in series with the electric switch in the loop of a direct voltage source for alternatingly turning on the switch in a first operating phase and turning off the switch in a second operating phase, and a secondary winding outputting an alternating voltage from which a direct voltage is obtained. An integratable trigger circuit is connected to the switch for pulse width modulated switching of the switch. The integratable trigger circuit has a controller for receiving an input voltage being at least approximately proportional to the alternating voltage, for comparing the input voltage with a set-point voltage, and for deriving a further voltage in the form of the voltage of a capacitor from the difference between the two voltages.