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:
Aug. 01, 2006
Filed:
Aug. 06, 2003
Ho-sun Yoo, Seongnam, KR;
Jul-ki Seok, Kyungsan, KR;
Ho-sun Yoo, Seongnam, KR;
Jul-ki Seok, Kyungsan, KR;
Samsung Electronics Co., Ltd., Suwon-Si, KR;
Abstract
A control method of a PI controller which selectively performs a proportional control and a proportional/integral control, the method includes Fourier transforming an output of the PI controller, calculating a spectral energy ratio of the transformed output of the PI controller of at a reference frequency for all frequency regions, performing the proportional control in response to the calculated spectral energy ratio exceeding a predetermined reference ratio, and the proportional/integral control in response to the spectral energy ratio being the predetermined reference ratio or less. Accordingly, a PI controller utilizing the method can easily detect a switching point between a proportional control and a proportional/integral control, independent of species and states of a system thereof.