Siemens Aktiengesellschaft

Franz Bauer

Hubert Schierling

Norbert Benesch

Michael Braun

Stefan Künzel

Gabriel M Daalmans

Georg Heinle

Egon Edinger

Harald Wiessmann

Hans Tischmacher

Christoph Brunotte

Jens Peter Lichterfeld

Klemens Kahlen

A method for determining a function of a capacitor of a passive filter circuit, which partially reduces line-conducted interference of an electrical device electrically coupled to a power supply system via the passive filter circuit. The passive filter circuit comprises the capacitor having a predefined capacitance value and a choke having a predefined inductance value. An electric capacitor voltage on the capacitor is detected. A connection voltage of the electrical device is detected. Spectral components are determined for the capacitor voltage and the connection voltage. The function of the capacitor is determined by analysing the spectral components in consideration of the inductance value of the choke by a statistical processing operation.

Determining a function of a capacitor of a passive filter circuit

In a method for operating an energy converter that couples a first supply network to a second supply network by converting electrical energy via a switch element, the switch element is operated in a switching operation and a supply-network current for one of the supply networks is adjusted depending on a comparison of the supply-network current with a reference current. In a first operating mode for the switching operation, an electrical voltage of one of the supply networks is set by a PWM method on the basis of the comparison, and a second operating mode is provided, in which the switch element is switched when, during the comparison, a difference between the supply-network current and the reference current is greater than a first predefined relative switching value and/or is smaller than a second predefined relative switching value, wherein the first and second operating modes are alternated during the operation.

Electrically coupling a first electrical supply network to a second electrical supply network

A drive controller and a method for operating a drive controller having a converter with a DC link circuit, includes measuring during operation phase currents generated by the converter; forming from the measured phase currents a current vector in a first coordinate system; rotating, with a first transformation angle and with a first rate of change, the current vector into a second coordinate system to generate a resulting current vector; supplying the resulting current vector to a regulator to generate a resulting voltage vector at an output of the regulator; rotating, with the first transformation angle or with a second transformation angle rotating at the first rate of change, the resulting voltage vector back into the first coordinate system to generate a resulting back-transformed voltage vector; and using the resulting back-transformed voltage vector as an influencing variable in addition to U/f control or vector regulation for controlling the converter.

Method for operating a drive control device, facility with means for executing the method and drive control device with such a facility

Converter and method for controlling a converter with power semiconductor switches, having a filter () which is connected to the power semiconductor switches and having a drive circuit () which is connected to the power semiconductor switches for the purpose of modulation, wherein, as a result of the modulation, a fundamental at a fundamental frequency (fGS) is generated in a passband (P) of the filter (), modulation products are generated in a first frequency band (FB), in a second frequency band (FB) and in an intermediate frequency band (ZFB) which is formed between the first frequency band (FB) and the second frequency band (FB), the modulation products in the intermediate frequency band (ZFB) are reduced in comparison with the modulation products in the first frequency band (FB) and the modulation products in the second frequency band (FB); and the intermediate frequency band (ZFB) is generated, in a resonant range (R) of a resonant frequency (fres) of the filter (), between the passband (P) and an attenuation range (D) of the filter (). A converter having an output-side sinusoidal filter whose dimensions have been reduced is thus obtained.

Converter with reduced harmonic waves

In order to compensate for a drop in sensitivity at high rotational speeds, an acceleration sensor having an inductive measuring head (T) which cooperates with a moving Ferraris disk (F) essentially over a main magnetic field and which supplies an acceleration-dependent variable (Vdet; V&#x3b1;) is expanded by an additional DC magnetic field excitation circuit (, I, R) with a means for driving the latter with the effect that the additional DC magnetic field acts in a compensating fashion on an eddy-current DC field, starting from a relatively high rotational speed (&#x3c9;) of the Ferraris disk (F). This can be performed by amplifying the main magnetic field or by reducing the eddy-current DC field. A control signal (V&#x3c9;), dependent on rotational speed, which both can be generated outside the sensor via a characteristic curve, and can be derived in the form of a control loop from the sensor signal (V&#x3b1;), serves as a drive.

Circuit arrangement for evaluating an acceleration sensor using the Ferraris principle

The present invention provides a current regulating method and associated apparatus for a voltage-injecting converter, wherein a flux-producing current component and a torque-producing current component of an actual current vector are regulated to corresponding components of a required current vector, whereby a precontrol variable is superimposed on each controller manipulated variable. According to the invention, the torque-producing controller manipulated variable acts on the flux-producing controller manipulated variable with delay as a function of a frequency variable, thereby providing a current regulating method which combines the advantages of two-component current regulation and active current regulation. This dual-action current regulation advantageously operates without requiring a structural switch between the two forms of current regulation.

Method and apparatus for current regulating in a voltage-injecting

Method and apparatus for correction of a detected faulty actual valve of

A method of applying ignition lines to the interior surface of glass walled surge voltage arrestors and an apparatus for the application thereof. The surge lines are applied by first roughing the interior surface at least in the area in which the ignition line is to be applied, and thereafter applying a graphite ignition line by rubbing a graphite pencil on the roughened surface.

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Herzogenaurach, Germany

Franz Bauer