The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 2010
Filed:
Jan. 21, 2005
Markus Lönn, Vaasa, FI;
Markus Lönn, Vaasa, FI;
ABB Oy, Helsinki, FI;
Abstract
An automatic control device having an input for inputting measured values of cyclic voltage and/or current; computing device for computing a parameter based on said values of voltage and/or current, and for comparing the computed parameter against a predefined condition; and initiating device for initiating a control function in response to the parameter meeting the predefined condition. The input of the control device is arranged to input a predefined number of samples per one cycle; and the computing device is arranged to compute the parameter with a discrete Fourier transform algorithm optimized based on fixed coefficients related to the predefined number of samples per cycle. An exemplary control device and corresponding control method can provide a significantly faster response time than the earlier general programmed solutions without increasing the related costs as much as the known digital signal processors.