G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 27/26 (2006.01)
Patent
CA 2125562
2125562 9312437 PCTABS00023 A method of the invention is intented for determination of inductance by means of an electric circuit (1) subjected to the action of a control system (2). In order to determine inductance (L), a measuring system (3) is used to measure one or more parameters, such as the intensity (I), voltage (U), electromotive force and/or the like of electric current traveling in the electric circuit (1). The control system (2) includes an electric-current chopping control element (2a), such as one or more transistors or the like, whereby a power supply (I, U) operating in electric circuit (1) is used to produce in the inductive section (i) of electric circuit (1) at least two voltages (U1, U2) of substantially different intensities, depending on the chopping phase, i.e. the on-phase and the off-phase of control element (2a). Thus, according to the invention, inductance (L) is determined on the basis of voltages (U1, U2) prevailing in the inductive section (i) of electric circuit (1) and/or on the basis of electric current intensity changes (dI1, dI2) occuring therein.
Borden Ladner Gervais Llp
Valiton Teknillinen Tutkimuskeskus
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