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Synthesis of active LTV elements

Piwowar Anna, Walczak Janusz

Archives of Electrical Engineering

2020

Vol. 69, nr 3

487--498

The article proposes the method of synthesis of active elements with timevarying parameters R(t), C(t) and L(t). In order to construct the elements, it is necessary to use operational amplifiers, multipliers and classic RLC components. The variability in time of the elements results from applying voltage to control terminals. Assuming that the parameters of elements R(t), L(t), C(t) are exponentially varying, dependencies describing the control voltage waveforms which enable such a parameter variability were determined. The obtained results were illustrated with examples and PSpice simulations.

Method of identification of equivalent parameters of the fractional-order transformer

Jakubowska-Ciszek Agnieszka, Walczak Janusz

Poznan University of Technology Academic Journals. Electrical Engineering

2019

No. 97

169--180

The paper presents a method for identifying the parameters Lβ1, β1, Lβ2, β2, Mγ, γ of a fractional-order transformer. This method is based on the measurement of the phase resonance frequency in a few systems containing: the investigated fractional-order transformer and two standard capacitors. The dependencies allowing the determination of the fractional-order transformer parameters have been given, on the basis of the described measurements. The obtained results are illustrated by an example.