Digital measurement input for an electric automation device, electric automation device comprising a digital measurement input, and method for processing digital input measurement values

• US 9,917,662 B2
• Filed: 01/22/2014
• Issued: 03/13/2018
• Est. Priority Date: 01/22/2014
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Jurisch, Andreas
• Primary Examiner(s): Bayard, Emmanuel
• Application Number:
  US15/109,874
• Publication Number:
  US 20160329975A1
• Time in Patent Office: 1,511 Days
• Field of Search: 375224, 375346, 375350, 375343
• CPC Class Codes: G01R 19/2509 Details concerning sampling, digitizing or waveform capturing
• CPC Class Codes: G05B 11/32 with inputs from more than one sensing element; with outputs to more than one correcting element
• CPC Class Codes: G05B 19/0423 Input/output
• CPC Class Codes: G05B 2219/21126 Signal processing, filter input
• CPC Class Codes: G05B 2219/21137 Analog to digital conversion, ADC, DAC
• CPC Class Codes: G05B 2219/37533 Real time processing of data acquisition, monitoring
• CPC Class Codes: H04B 1/0042 Digital filtering H04B1/0035 takes precedence; digital filters per se H03H17/00
• CPC Class Codes: H04B 1/16 Circuits
• CPC Class Codes: H04B 17/20 of receivers
• CPC Class Codes: H04L 25/03834 using pulse shaping

Abstract

A digital measurement input for an electric automation device has a receiving device configured to receive digital input measurement values generated by sampling an analog measurement signal at a first sampling rate, and a signal converting device configured to generate digital output measurement values from the digital input measurement values and to provide digital output measurement values. The sampling rate and sampling times of each digital output measurement value is adapted to a specified sampling rate and/or specified sampling time. The signal converting device has a digital encoder filter on the input side and a digital decoder filter on the output side, between which an interpolator is provided. The encoder filter, the interpolator, and the decoder filter are matched to one another so as to adapt the sampling rate and/or sampling time of the digital input measurement values.

Claims

1. A digital measurement input for an electric automation device, the digital measurement input comprising:

a receiving device configured to receive digital input measurement values which have been generated by sampling an analog measurement signal at a first sampling rate via a merging unit being different from the electric automation device; and

a signal conversion device configured to form and provide digital output measurement values from the digital input measurement values, at least one of a sampling rate or sampling times of the digital output measurement values is adapted to at least one of a specified sampling rate or specified sampling times, said signal conversion device having a digital encoder filter on an input side and a decoder filter on an output side, between which an interpolator is disposed, said encoder filter, said interpolator and said decoder filter are matched to one another so that an adaptation of at least one of a sampling rate or sampling times of the digital input measurement values is effected by said signal conversion device.

2. The digital measurement input according to claim 1, wherein said interpolator is configured to generate interpolated digital auxiliary measurement values using a signal model.

3. The digital measurement input according to claim 2, wherein the signal model describes a quadratic function.

4. The digital measurement input according to claim 1, wherein said encoder filter and said decoder filter have individual transmission functions which can be matched to one another so that their common transmission function effects an adjustable shift of a phase response of a sequence of digital input measurement values in order to generate a required temporal shift of the digital output measurement values compared to the digital input measurement values.

5. The digital measurement input according to claim 1, wherein said encoder filter has a PD characteristic and said decoder filter has a low-pass characteristic.

6. The digital measurement input according to claim 1, wherein the digital measurement input is configured in a form of a processing module with hardware-defined programming.

7. The digital measurement input according to claim 6, wherein said processing module has a memory register in which filter coefficients of at least one of said encoder filter or said decoder filter are modifiably stored.

8. The digital measurement input according to claim 1, wherein said receiving device is configured to receive the digital input measurement values in a form of data messages.

9. The digital measurement input according to claim 8, wherein said receiving device is configured to extract information relating to the first sampling rate from the data messages containing the digital input measurement values and forward the information to said signal conversion device.

10. The digital measurement input according to claim 1, wherein the digital measurement input is configured as an ASIC or an FPGA.

11. An electric automation device, comprising:

a digital measurement input, containing;

a receiving device configured to receive digital input measurement values which have been generated by sampling an analog measurement signal at a first sampling rate via a merging unit being different from the electric automation device; and

a signal conversion device configured to form and provide digital output measurement values from the digital input measurement values, at least one of a sampling rate or sampling times of the digital output measurement values is adapted to at least one of a specified sampling rate or specified sampling times, said signal conversion device having a digital encoder filter on an input side and a decoder filter on an output side, between which an interpolator is disposed, said encoder filter, said interpolator and said decoder filter are matched to one another so that an adaptation of at least one of a sampling rate or sampling times of the digital input measurement values is effected by said signal conversion device.

12. The electric automation device according to claim 11,

further comprising at least one analog signal input configured to capture a local analog measurement signal and to form local digital measurement values;

and

wherein said signal conversion device of said digital measurement input is configured to use at least one of a sampling rate or sampling times of the local digital measurement values as at least one of the specified sampling rate or the specified sampling times in order to adapt at least one of the sampling rate or the sampling times of the digital input measurement values.

13. The electric automation device according to claim 11, further comprising at least one further digital measurement input which is configured according to said digital measurement input.

14. The electric automation device according to claim 11, wherein said digital measurement input is configured to receive and process a plurality of sequences of digital input measurement values.

15. A method for processing digital input measurement values having been generated by sampling an analog measurement signal at a first sampling rate, which comprises the steps of:

receiving the digital input measurement values via a receiving device of a digital measurement input of an automation device, the digital input measurement values being generated in a merging unit being different from the automation device;

forming and providing digital output measurement values with a signal conversion device of the digital measurement input from the digital input measurement values, at least one of a sampling rate or sampling times of the digital output measurement values are adapted to at least one of a specified sampling rate or specified sampling times;

filtering the digital input measurement values with a digital encoder filter of the signal conversion device with formation of encoded digital input measurement values;

interpolating the encoded digital input measurement values with an interpolator of the signal conversion device with formation of digital auxiliary measurement values; and

filtering the digital auxiliary measurement values with a digital decoder filter of the signal conversion device with formation of the digital output measurement values, the encoder filter, the interpolator and the decoder filter are matched to one another so that they effect an adaptation of at least one of a sampling rate or sampling times of the digital input measurement values.

16. The method according to claim 15, wherein a common transmission function resulting from a linking of individual transmission functions of the encoder filter and the decoder filter effects an adjustable shift of a phase response of a sequence of digital input measurement values in order to generate a required temporal shift of the digital output measurement values compared with the digital input measurement values.