Вісники та науково-технічні збірники, журнали
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Item Limitation of third harmonic of supply network current in phase control systems of commutator motors(Видавництво Національного університету «Львівська політехніка», 2002) Gąska, Dariusz; Kalita, Włodzimierz; Zając, Kazimierz; HYBRES Electronics Ltd., Rzeszów; Rzeszów University of Technology, Dept. of Electronic and Communication SystemsThis paper presents simple non-conventional circuit design for the third harmonic limitation of power supply current that is drawn by the medium power commutator motor with the phase control. The proposed solution features a simple design, low manufacture costs and operational effectiveness.Item Laboratory circuit to measure small capacity(Видавництво Національного університету "Львівська політехніка", 2002) Chamiecki, Andrzej; Schwarz, Ulrich; Wisz, Bogusław; Zając, Kazimierz; Hybres Electronics Ltd., Rzeszów, Poland; Fachhochschule Südwestfalen, Soest, Germany; Rzeszów University of Technology, Dept. of Electronic and Communication Systems, PolandThis paper presents simple method for small capacity measurement that is based on the operational amplifier oprating as an integrator with the polarization current compensation. Basing on this concept, the laboratory measurement circuit was designed and realized. The developed method accounts also for the circuit self-capacity that in turn allows for measurement error reduction up to 10 % for capacity of several pF. The experiment results were presented, and the measurement results were discussed.