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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]

The paper discusses the electronic control of Induction heater power converter for ferromagnetic materials melting working in independent excitation. The system of power electronic converters is composed by a controlled three-phase rectifier and parallel current source inverter. Analysis of regime with fixed current from the DC supply source has been made. This guarantees working with maximum power and respectively short meting process time. [ABSTRACT FROM AUTHOR]

Logisim is a program used for digital circuits simulation - gates, flip-flops and latches. This paper presents a simple method, which allows simulation of circuits, designed for the power electronics devices, based on digital control units. [ABSTRACT FROM AUTHOR]

In the work photovoltaic systems with DC load are studied. The study was conducted in order to increase effectiveness of photovoltaic systems. [ABSTRACT FROM AUTHOR]

The paper presents comparison between resonant inverters with reverse diodes and resonant inverters with limited voltage over the commutating elements (capacitors and inductances). Output and input characteristics of these inverters are given. [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]

The purpose of this paperwork is to present a developed an experimental stand for testing different kinds of bi - directional circuits, providing a work of a supercapacitors in renewable energy systems - photovoltaic systems. A simulation model has been created of the studied bi - directional converter. During combined operation between a supercapacitor and a battery there are mainly two kinds of wiring methods. In the first method the battery is working in buffer mode and the supercapacitor is connected to the bi - directional converter. The second method is when the supercapacitor is working in buffer mode and the battery is connected to the bi - directional converter [1, 5]. In this paperwork a renewable energy system build in the first method is studied. For testing different circuit kinds of bi - directional converters in photovoltaic systems, an experimental stand, described in this work, has been created. The information measuring system is realized by the softwer LabView. In the document a comparison between the simulation and experimental results has been made. [ABSTRACT FROM AUTHOR]