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Patent Searching and Data


Title:
POWER FUNDAMENTAL WAVE PHASE DETECTION DEVICE
Document Type and Number:
Japanese Patent JPH10282162
Kind Code:
A
Abstract:

To detect the phase of a power fundamental wave in real time for following.

A programmable timer 19 generates a trigger with a timing where one wavelength section of the current or a voltage of a power fundamental wave is divided into N equal portions, the power fundamental wave being inputted to an A/D converter 1 is sampled at a trigger timing, obtained sampling values are multiplied by sin (2 nπ/N) and cos (2 nπ/N) values corresponding to a phase (n) and are integrated for a wavelength section immediately before, and an value being obtained by multiplying each of both integrated values by 2/N is outputted as a coefficient A of a sin term of the current or the voltage of the power fundamental wave and a coefficient B of a cos term, thus monitoring the fluctuation of the phase from the both coefficients.


Inventors:
KAWADA SHINYA
Application Number:
JP9205497A
Publication Date:
October 23, 1998
Filing Date:
April 10, 1997
Export Citation:
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Assignee:
FUJI ELECTRIC CO LTD
International Classes:
G01R23/16; G01R25/00; G06F17/14; (IPC1-7): G01R23/16; G01R25/00; G06F17/14
Attorney, Agent or Firm:
Yuichi Morita