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 control process for a voltage transformer for sine-wave line current input with a large input voltage range, includes controlling or regulating the input current of the voltage transformer as a function of a current command value. The output voltage of the voltage transformer is in the form of an actual value input quantity of a controller which supplies a control signal as a function of an output voltage command value. The above-mentioned current command value is obtained by multiplying a signal proportional to the rectified input voltage of the voltage transformer by the above-mentioned control signal, and also by a direct current voltage signal which is a reciprocal of the peak value, to the effective value or to the average value of the input voltage of the voltage transformer. Such a process is preferably used in a switched-mode voltage transformer, e.g. in an isolating transformer, a step-up transformer or a step-up/step-down transformer.

Abstract: A switched-mode power supply for compensating for fluctuations in a feed voltage includes at least one electronic switch and a control circuit with a frequency generator, a comparator circuit, and a trigger circuit. The trigger circuit furnishes a trigger signal for the electronic switch as a function of an output signal of the comparator circuit and an output signal of the frequency generator. The comparator circuit has a switching threshold being defined as a function of a load current of the switched-mode power supply. The comparator circuit has a signal input being triggered with a periodically rising and falling control signal having a frequency defined by the frequency generator. The control signal has a signal shape being varied as a function of an instantaneous value of a feed voltage of the switched-mode power supply.

Abstract: An integratable filter has a bandplass behavior and comprises a power source which is controllable with negative feedback by way of a resistor and a capacitor and whose output is charged with a further capacitor.

Abstract: An integratable amplifier circuit includes a differential amplifier stage having a non-inverting input being acted upon by a first reference potential, an inverting input being acted upon by an input current, a non-inverting output, and an inverting output. A capacitor is connected between the non-inverting output and ground potential. A current source is connected between the inverting output and a supply potential. A first transistor of one conduction type has a collector connected to the supply potential, a base connected to the non-inverting output, and an emitter. A second transistor of the other conduction type has a collector connected to the inverting input, a base being acted upon by a second reference potential, and an emitter. A resistor is connected between the emitters of the first and second transistors.

Abstract: An integrated semiconductor circuit with a ring oscillator having a frequency settable via an operating current of the ring oscillator, the ring oscillator having inverter cells which are connected in parallel with respect to the current supply of the ring oscillator, conjointly with a current supply terminal thereof, via a variable resistance to the supply potential present in the current supply, includes a voltage divider forming the variable resistance and including a plurality of series-connected resistors, the voltage divider having a plurality of terminals including an end terminal, the end terminal connecting the voltage divider in an identical manner to a current supply terminal of the inverter cells of the ring oscillator and, additionally, to an externally addressable electrode, each even-numbered other terminal of the voltage divider, as counted in direction of increasing distance from the end terminal, being likewise connected to another externally addressable electrode, respectively, of the integ