Design and Analysis of Cascaded Buck-Boost Zeta (CBBZ) Converters for Improved Efficiency at High Output Voltage

Abstract

Various types of power electronic converters are now frequently used in electric power system applications such as power converter, communication systems, grid-connected systems, DC power supply and so on. A DC-DC converter which provides different levels of output voltage is really essential and have a wide variety of applications. However, the traditional DC-DC converters are not adequate enough to make proper conversion without compromising performance. There is always a trade-off between efficiency and other performances. The attempt of attaining high voltage gain introduces unwanted harmonics, thus deteriorating the signal shape. The design of cascaded topologies can be used to overcome these problems. Even in cascaded DC-DC converter, the efficiency decreases as the duty cycle of the DC-DC converter increases. This decrease in efficiency is caused by conduction loss and due to circuit topology. To overcome such limitations, in this research a Cascaded Buck-Boost Zeta (CBBZ) converter is designed. In this research the proposed converter’s AC-DC and closed-loop topology is also analyzed. The proposed converter is expected to provide high output voltage with high efficiency in comparison to the conventional Buck-Boost, Zeta converter and other cascaded converters.