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Title:
METHOD AND DEVICE FOR PRODUCING A DIGITAL SIGNAL
Document Type and Number:
WIPO Patent Application WO/2014/114755
Kind Code:
A3
Abstract:
The invention relates to a method for producing a digital signal (DS) from an analog signal (UA) produced by means of a frequency converter on the basis of a pulse-width modulation having a variable period duration, wherein values of the digital signal (DS) correspond to a mean of the analog signal (UA) over an associated period duration of the pulse-width modulation, comprising the following steps: producing a bit stream (BS) as a function of the analog signal (UA) by means of a sigma-delta modulator (1), wherein the bit stream is produced with a constant modulator cycle time, producing temporally successive digital sampled values (S_1 to S_r) during an associated period duration by filtering the bit stream (BS) by means of a number of digital filters (2_1 to 2_r), wherein time intervals between the temporally successive digital sampled values are multiples of the modulator cycle time, the digital filters (2_1 to 2_r) are started at time offsets from each other in the time intervals of the multiples of the modulator cycle time, and each digital filter (2_1 to 2_r) outputs an associated digital sampled value (S_1 to S_r), and calculating a mean of the digital sampled values (S_1 to S_r) produced during the associated period duration, wherein the mean forms the value of the digital signal (DS) for the associated period duration.

Inventors:
DÜSTERBERG, Dirk (Jahnstraße 9, Emmerthal, 31860, DE)
STICHWEH, Heiko (Lisztweg 9, Springe, 31832, DE)
Application Number:
EP2014/051414
Publication Date:
February 19, 2015
Filing Date:
January 24, 2014
Export Citation:
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Assignee:
LENZE AUTOMATION GMBH (Hans-Lenze-Straße 1, Aerzen, 31855, DE)
International Classes:
H03M3/00; H02M5/00
Domestic Patent References:
WO2002091581A22002-11-14
Foreign References:
US20060103555A12006-05-18
US20060170579A12006-08-03
GB2440559A2008-02-06
US5646621A1997-07-08
EP0335988A11989-10-11
US20100085230A12010-04-08
JP2006140962A2006-06-01
Attorney, Agent or Firm:
PATENTANWÄLTE RUFF, WILHELM, BEIER, DAUSTER & PARTNER (Kronenstraße 30, Stuttgart, 70174, DE)
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