Journal of Research in Electrical Circuits and Systems ISSN: 3139-2059 (Online)

Abstract

Within the scope of this article, a dynamic model for single-stage forward- flyback switching DC-DC converters is presented. A single power switch, a single input inductor, an entirely capacitive output filter, isolation, low current ripple through the output capacitor, and operation at a constant frequency in a conventional pulse-width-modulation scheme are some of the significant advantages that the proposed model offers. The power factor correction and multiple-output power supply applications are two potential uses for the innovative new converter that has been presented. It is capable of operating across a broad variety of input voltages. The typical AC/DC flyback converter is capable of achieving a decent power factor, but it has a high offset current through the transformer magnetising inductor. This high offset current results in a huge core loss and low power conversion efficiency. In addition, the traditional forward converter is capable of achieving strong power conversion efficiency with the assistance of a low core loss; nevertheless, the input current dead zone at the zero cross AC input voltage causes a reduction in the power factor. On the other hand, because the proposed converter is able to operate both as forward and flyback converters during the switch on and switch off periods, respectively, it is not only able to perform power transfer during the entirety of the switching period, but it is also able to achieve a high power factor as a result of the flyback operation. In addition, the core loss and volume of the transformer may be reduced thanks to the current balanced capacitor's capability of reducing the amount

of offset current that flows through the transformer's magnetising inductor. This reduction is possible independent of the AC input voltage. As a result, the converter that has been presented has a high efficiency as well as a high power factor. It begins with the construction of a simulation model in MATLAB/Simulink, which is followed by the validation of the produced model by the execution of the model on a simulation platform, from which multiple performances are acquired.

Keywords: Single Switch design, LED Drive Circuits, Flyback Converter, DC- DC Converters