Siemens Aktiengesellschaft

Thomas Fleischmann

Stefan Widmann

Andreas Danner

A method is disclosed for retrieving a data point (operating data) of a switch via a device which does not recognize the data point of the switch and which can only retrieve such data points of a switch. The device is connected to the switch via a data connection for retrieval. In an embodiment, the switch has a data set in which the data point is described including the use of said data point. The device retrieves the data set during the data connection and extracts at least the description and the use of the data point of the switch from the data set. The device retrieves said data point that is recognized by the device at least for the duration of the data connection and processes said data point using the extracted description and use.

Method for retrieving a data point of a switch

A method includes ascertaining harmonic components of a periodic analog signal at a fundamental frequency which changes over time. The signal is digitized and fast Fourier transformed. A target signal is produced by modulating the signal using a first carrier frequency to form two frequency sidebands, the first carrier frequency being greater than the fundamental frequency of the signal. One of the two frequency sidebands of the modulated signal is filtered. The filtered frequency sideband is modulated using a second carrier frequency forming two frequency sidebands. The second carrier frequency is greater than the fundamental frequency of the signal. The difference between the second and first carrier frequencies is the same as the difference between the fundamental frequency and the target fundamental frequency. One of these two frequency sidebands is output as the target signal to calculate the fast Fourier transformation.

Method for ascertaining the harmonic components of an analog electrical signal at a fundamental frequency which changes over time

A system is disclosed, in particular for digitizing a time-continuous and value-continuous periodic signal with a respective firmly predefined number of samples per period. In at least one embodiment, the system includes an A/D converter for digitizing an analog AC signal applied to the input of the A/D converter, the converter including a single-bit modulator which converts the AC signal into a first data stream of temporally immediately successive single-bit data words at a predefined operating clock rate; and a downstream decimation filter which respectively aggregates a predefined number of temporally immediately successive single-bit data words in the first data stream into respective temporally immediately successive n-bit data words which form a second data stream which corresponds to a digitization of the AC signal at a sampling frequency which is derived from the operating clock rate and the predefined number by way of division. In order to achieve digitization with a respective firmly predefined number of samples per period with relatively little technical complexity, it is proposed in at least one embodiment that the operating clock rate be respectively generated by a digitally adjustable oscillator on the basis of a signal characteristic of the AC signal.

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Röthenbach, Germany

Thomas Fleischmann