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:
Feb. 27, 2001
Filed:
May. 30, 2000
Petri Schroderus, Espoo, FI;
Samuli Heikkilä, Helsinki, FI;
ABB Industry Oy, , FI;
Abstract
A method of defining an instantaneous value of a current (i,e) of a pulse-controlled inductive load when the impedance of the load is known, the method comprising the steps of: measuring the output voltage (u,) of a pulsed voltage source, and measuring the output current (i,) of the pulsed voltage source. The method is characterized by further comprising the steps of: low-pass filtering the measured output current (i,) of the pulsed voltage source to produce a fundamental wave current (i,lp), defining a load current estimate (i,est) by computation on the basis of the measured output voltage (u,) of the pulsed voltage source and the impedance of the load, high-pass filtering the load current estimate (i,est), and defining the instantaneous value of the load current (i,e) by adding the high-pass-filtered load current estimate (i,hp) to the fundamental wave current (i,p).