Performance of Positive Buck-Boost Converter with Mode Select Circuit and Feed-Forward Techniques Using Fuzzy Logic Controller

Abstract

Abstract-This project is a highly efficient & novel control strategy for improving the transient in the output voltage of a dc-dc positive buckboost converter which is required for low portable devices. The portable devices development of semiconductor manufacturing technology, conversion efficiency, power consumption, and the size of devices have become the most important design criteria of switching power converters. For portable applications better conveniences extension of battery life and improves the conversion efficiency of power converters .It is essential to develop accurate switching power converters, which can reduce more wasted power energy. The proposed topology can achieve faster transient responses when the supply voltages are changed for the converter by making use of the feed forward n etwork .With mode select circuit the conduction & switching losses are reduced the positive buck-boost converter operate in buck, buck-boost, or boost converter. By adding feed-forward techniques, the proposed converter can improve transient response when the supply voltages are changed. Hence Positive buck-boost converters with mode select circuit &feed forward techniques using fuzzy logic converter is designed And the modeling & experimental results were verified in MATLAB/ Simulink

Comparative Analysis of High Power Density Bidirectional DC-DC Converters for Portable Energy Storage Applications

“…The most universal solution for a bidirectional power flow interface is a cascaded converter [47]- [59]. This topology can provide either step-up or step-down conversion in both directions.…”

“…There are some modulation techniques that allow achieving ZVS and thus obtain better efficiency [47]- [49]. To simplify the calculations, a simple buck mode will be used: switch T 1 acts as the main power switch, T 2 operates as the main diode, T 3 is always open [55], [57]- [59]. The relation between the input and the output voltage in CCM is the same as for a conventional buck converter ) .…”