Abstract: A method for classifying electrical sheet is produced. The electrical sheet is used to produce an electrical machine and is available in the form of a strip roll wherein a magnetic flux that changes over time and that causes a shape change of the strip roll and magnetic losses is produced in the strip roll using an excitation winding fed by a feeding device, the shape change and/or the magnetic losses are measured using a measuring device and the measurement signal obtained is fed to an evaluation device, and the evaluation device categorizes the electrical sheet in regard to noise emission and/or magnetic losses using the measurement signal.

Abstract: There is described a powering unit comprising at least one transformer, at least one full bridge circuit via which a primary winding of the transformer is connected to a direct current voltage input, a secondary winding for triggering an output circuit with an output direct current voltage via a bridge-type rectifier circuit as well as an output choke coil and an output capacitor, and a discharge circuit consisting a diode, for a capacitor and of a resistor for reducing the secondary-side peak voltages. The powering unit has another secondary winding, another bridge-type rectifier circuit and another discharge circuit operable to trigger the output circuit with part of the output direct current voltage via the output choke coil and the output capacitor. Thus, there are fewer losses in the resistors and the performance is enhanced.

Abstract: There is described a method for measuring an alternating current which is generated using inverters and is fed into an AC power system, wherein a zero crossing signal of the AC power system is predefined, and wherein, triggered by the zero crossing signal, the measured alternating current is periodically adjusted in such a manner that an adjustment value which is assigned to the zero crossing signal is predefined, a measured value which is assigned to the zero crossing signal being adapted to said adjustment value. This method makes it possible for the measurement signal detected by a measuring circuit to be periodically adjusted using an adjustment value even during operation.

Abstract: A mains power supply unit for the purpose of supplying consumers that are connected directly or by way of a voltage system converter to a direct voltage branch of a mains power supply unit comprises a buffer capacitor (C) that can be charged from the mains supply and that still supplies the direct voltage branch for a predetermined minimum period of time in the event of a failure or interruption in the mains supply. In such an event, the buffer capacitor (C) can be charged by way of a dedicated charging circuit (3) to a voltage (U2), which, regardless of the voltage fluctuations in the direct voltage branch, is substantially constant and corresponds in a substantial manner to the upper limit value of the direct voltage (U1) to which limit value the mains power supply unit is dimensioned. The buffer capacitor can be connected onto the direct voltage branch by way of a controlled switch (S) in the event of undervoltage in the mains supply or in the direct voltage branch.

Abstract: A method and device for recognizing individual words of spoken speech can be used to control technical processes. The method proposed by the invention is based on feature extraction which is particularly efficient in terms of computing capacity and recognition rate, plus subsequent classification of the individual words using a neural network.

Abstract: A high-frequency oscillator is provided for a frequency range of 1.6 to 3 GHz. An oscillator stage includes an oscillator transistor and a voltage-controlled resonator unit. A buffer stage is connected at an output of the oscillator stage. The resonator unit includes an open resonator in the form of an etched structure with a wavelength which is shorter than lambda/4 (where lambda is an oscillator length). The resonator unit includes a voltage-controlled variable-capacitance diode, and a resonator terminal is connected between the voltage-controlled variable-capacitance diode of the resonator unit and the oscillator transistor of the oscillator stage. The resonator is preferably an open microstrip resonator, and the stages are disposed in a standardized housing in SMD (surface mounted device) technology.