Aspects on Simulations of High Frequency Converter AC-DC and DC-AC from Modern Power Supply

The paper present some aspects fromsimulation functioning of the modern supply for nonindustrialequipment, unlike the industrial powersupply installations, must have specific parameters(voltage and frequency). The role of the converter inthis system is to convert the alternative current of theindustrial supplying device to a continuous current;and again with the help of the inverter the DC voltageis converted back in AC voltage.High amount of direct current is essential in manyindustrial processes. Conventional methods forobtaining high amount of direct current involveparallel operation of converters with interphase or fiveleggedrectifier transformer. The interphasetransformer (IPT) and/or rectifier transformeremployed in the system increase overall size of thesystem and also provide limited control over theoperation. This paper presents simpler topology of highfrequency AC-DC converter specially for low-voltagehigh-current industrial applications. In the proposedtopology, rectifier module and low frequency L-C filterin the primary stage (required for conventional highfrequency converters) are eliminated. The topologyprovides better control over the operation and helps inreducing size of the overall rectifier system. On theother hand this paper presents the alternative –continuous current conversion bridge (the converter),the continuous – alternative conversion bridge (theinverter) having different switching elements and thePulse Width Modulation, PWM, command signalgeneration methods of the semiconductor elements byusing the “Matlab–Simulink” graphical environment.The system, converter-inverter, has been simulated fora specific parameters R, L, C. These parameters havebeen obtained after a designing calculation for auniversal load. The simulations presented use the staticswitching device as optimal for a proper behaviour ofthe inverter in the case of the given charge.