V.A. Filin1, L. E. Bayjоnova2, A.N. Golovin3, V.A. Yurova4

1, 3–4 The Bonch-Bruevich St Petersburg State University of Telecommunications (St Petersburg, Russian Federation)

2 Tashkent University of Information Technologies named after Muhammad al-Khwarizmi (Tashkent, Uzbekistan)

4 North-Western State Medical University named after I.I. Mechnikov (St Petersburg, Russian Federation)

1 filin_vladimir@mail.ru; 2 bayjonoval@gmail.com; 3 cathseugut@yandex.ru; 4 v.a.yurova@sut.ru

The problem of comparative analysis of the impedances of switching mode devices with negative feedback by two methods is considered. The use of a linear injection model is justified, on the basis of which analytical expressions of impedances in Laplace form are obtained. The results of numerical modeling and spectral analysis of processes in a closed dynamic system with PWM are presented, confirming the correctness of the analytical model in the frequency range not exceeding half the clock frequency.

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