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In the paper work a experimental study has been made with practical trend, of a Buck DC - DC quasi resonant converter, working with ZVS (Zero Voltage Switching). In the work a mathematical expressions, for the parameters, which describe the work of the power part of the circuit, has been made. With their help a method for designing of a Buck ZVS DC - DC quasi resonant converter has been proposed. The advantage of this method is the use of simple expressions, which facilitate the designing, but in the same time an acceptable error of 10 % is kept, commensurate with the tolerance of the values of the reactive elements (capacitor and inductor). The verification of these expressions has been made with modeling (Matlab/Simulink), computer simulations (LTSpice) and experimental measurements on a laboratory stand. [ABSTRACT FROM AUTHOR]

In the following article a converter, providing management of the energy flow from the photovoltaic system (PV) to the elements for energy storage - supercapacitors, has been studied. The proposed converter provides charging and voltage balancing across series connected elements (supercapacitor cells). Simulation and experimental studies of the proposed circuit, from the PV system, has been made. Characteristics of the tested converter were made. [ABSTRACT FROM AUTHOR]