Title:
PHASE MEASUREMENT DEVICE AND INSTRUMENT IN WHICH PHASE MEASUREMENT DEVICE IS APPLIED
Document Type and Number:
WIPO Patent Application WO/2017/191804
Kind Code:
A1
Abstract:
This phase measurement device is provided with: a count processor 4 that counts a zero crossing detection count C, which is the number of times a change in the sign of a digital signal has been detected; and a fraction processor 5 for calculating a fraction Fj (j = 1 to L) of the zero crossing detection count on the basis of the digital signal at sampling timings immediately before and immediately after a zero crossing specification means has determined a zero crossing, and computing a fraction processing parameter Gj=Nj-Fj using a zero crossing detection number Nj(1 ≤ Nj ≤ N) in a period corresponding to a sampling count N necessary for averaging determined in advance. The averaging is performed according to the following formula, where C is the output of the count processor at the end of an averaging period and Gj(j=1 to L) is L fraction processing parameters computed by the fraction processor, and the phase of the digital signal is computed, whereby the phase is calculated on the basis of an input signal digital value obtained by an AD converter.
More Like This:
Inventors:
KOKUYAMA WATARU (JP)
Application Number:
PCT/JP2017/016764
Publication Date:
November 09, 2017
Filing Date:
April 27, 2017
Export Citation:
Assignee:
AIST (JP)
International Classes:
G01R25/00; G01R29/26
Domestic Patent References:
| WO2016076419A1 | 2016-05-19 |
Foreign References:
| JP2003188863A | 2003-07-04 | |||
| JP2006270372A | 2006-10-05 | |||
| JP2012217121A | 2012-11-08 | |||
| JP2946675B2 | 1999-09-06 | |||
| JP2012217121A | 2012-11-08 | |||
| JP5468372B2 | 2014-04-09 | |||
| JP2007232380A | 2007-09-13 | |||
| JP2015081984W | 2015-11-13 |
Other References:
See also references of EP 3447505A4
Download PDF: