- Patent Title: Method for processing a measured-value signal determined in an analog manner, a resolver system for implementing the method and a method for determining an output current of a converter
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Application No.: US16653246Application Date: 2019-10-15
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Publication No.: US10735022B2Publication Date: 2020-08-04
- Inventor: Wolfgang Hammel , Ulrich Neumayer
- Applicant: SEW-EURODRIVE GMBH & CO. KG
- Applicant Address: DE Bruchsal
- Assignee: SEW-EURODRIVE GMBH & CO. KG
- Current Assignee: SEW-EURODRIVE GMBH & CO. KG
- Current Assignee Address: DE Bruchsal
- Agency: Hunton Andrews Kurth LLP
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@29d84876 com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@2ac3a845
- Main IPC: H03M3/00
- IPC: H03M3/00 ; H03M1/64 ; H03M1/66

Abstract:
In method for processing a measured-value signal determined in an analog manner and a resolver system for implementing the method, the measured-value signal being supplied to a delta-sigma modulator, which makes a bit stream, particularly a one-bit data stream, available on the output side, in particular, whose moving average corresponds to the measured-value signal, the bit stream being supplied to a first digital filter, which converts the bit stream into a stream of digital intermediate words, that is a multibit data stream, the first digital filter having three serially arranged differentiators, the bit stream being clocked at a clock frequency fS, that is, at a clock-pulse period TS=1/fS, and therefore the stream of digital intermediate words being clocked, and thus updated, at a clock-pulse frequency fD, that is, at a clock-pulse period TD=1/fD, the output signal of the first digital filter being supplied to a second digital filter, the second digital filter having as its output data-word stream the difference between a first and a second result data-word stream, the first and second result data-word stream being determined around a first and second time interval from the intermediate data-word stream, the first and second time interval being situated at a distance in time T1, the first result data-word stream being determined as a time-discrete second derivation with time scale TD and the second result data-word stream being determined as a time-discrete second derivation with time scale TD.
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