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1

Small-signal transmittances of the non-ideal flyback switch-mode DC–DC converter

Bączek Maciej, Janke Włodzimierz, Kraśniewski Jarosław

Archives of Electrical Engineering

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2024

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Vol. 73, nr 1

1--15

EN

Small-signal transmittances of the power stage of a flyback converter in continuous conduction mode are derived on the averaged model obtained by the separation of variables approach. The precise knowledge of these transmittances is necessary in the design process of the converter control circuit. Apart from mathematical formulas for transmittances, the numerical calculations of the frequency dependencies of the transmittances for the assumed set of the converter parameters are presented with the parasitic resistances of components taken into account. The results of the calculations are compared with the measurements performed on the laboratory model of the converter and a good consistency is observed. It is concluded, that the results of the paper may be useful in the designing process of a control circuit of the flyback converter.

2

Averaged model of a buck DC–DC converter for single-loop description of current-mode control

Janke Włodzimierz, Bączek Maciej, Kraśniewski Jarosław

Archives of Electrical Engineering

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2019

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Vol. 68, nr 4

891--905

EN

: Averaged models: an AC large signal, DC and AC small signals of a currentcontrolled buck converter are described. Only peak current mode control of a converter working in the continuous conduction mode (CCM) is considered. The model derivation differs from the typical approaches presented in the literature and doesn’t refer to the multiloop concept of a current controlled converter. The separation of the variables method is used in the model derivation. The resulting models are presented in the form of an equation set and equivalent circuits. The calculations based on the presented models are verified by measurements and full-wave PSpice simulations.

3

Analysis and Designing of a Wireless Charging System for Electric Vehicles Using the Topology of Double Sided LLC Compensator

Khademi Hamid Reza, Moghaddam Mahmoud Samiei, Baygi Seyed Javad Mohammadi, Hajizadeh Amin

Advances in Science and Technology. Research Journal

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2019

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Vol. 13, no 2

168--175

EN

The purpose of the present study was to simulate the equivalent circuit in the MATLAB software in order to implement the desired relationships for both continuous-conduction mode (CCM) and discontinuous-conduction mode (DCM), and to obtain the power and efficiency values at different frequencies. Then, it was necessary to optimize the effective values on the power by Particle Swarm Optimization (PSO) algorithm. After optimization, the optimization and pre-optimization results were compared and, if post-optimization results were not desirable, effective parameters should be reviewed before the optimization stage and the tunable parameters should be changed to achieve the desired results. This process will continue to obtain the optimization results. The results show that the highest efficiency is 98% in the DCM mode and 95% in the CCM mode. In both methods, we achieved more favorable results than the with the PSO method. However, the DCM mode provides an improvement which is about 2.6% higher than CCM.

4

Analytical Comparison between Capacitor Assisted and Diode Assisted Cascaded Quasi-Z-Source Inverters

Vinnikov D., Roasto I., Jalakas T., Strzelecki R., Adamowicz M.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 1a

212-217

EN

The quasi-Z-source inverter is a very attractive topology because of its unique capability of voltage boost and buck functions in a single stage. But its voltage boost property could be a limiting feature in some applications where very high input voltage gain is required. The input voltage gain could be extended by the implementation of the cascaded quasi-impedance network. This paper discusses four novel cascaded quasi-Z-source inverters. Steady state analysis of topologies operating in continuous conduction mode is presented. Performances of topologies were compared and experimentally validated. Moreover, some problematic issues of proposed topologies were pointed out and discussed.

PL

Quasi-Z falownik z prostym obwodem impedancyjnym jest bardzo interesującym rozwiązaniem topologicznym ze względu na unikalną możliwość jednostopniowego przekształcanie DC/AC w połączeniu z funkcjami obniżania i podwyższania napięcia. W niektórych aplikacjach jego właściwości podwyższające są jednak niewystarczające. Wyższe napięcie wejściowe można uzyskać w wyniku zastosowania w quasi-Z-falownikach kaskadowych obwodów impedancyjnych. W artykule omówiono cztery nowe topologie kaskadowych quasi-Z-falowników. Przedstawiono wyniki analizy stanów statycznych tych układów przy przewodzeniu ciągłym. Porównano właściwości badanych topologii, zweryfikowane eksperymentalnie. Omówiono także inne problemy związane z proponowanymi układami.