Abstract
The non-inverting buck boost (NIBB) converter has attracted significant attention in recent years, as it shares ground between input and output, and the voltage stress of switches is lower. In order to investigate the differences between NIBB and conventional buck boost converters, a comprehensive comparison and analysis of these two converters were conducted in terms of their operation principles, which includes multi-mode control strategy and dual-edge modulation here, and also the characteristics of switches and passive components in the two converters were analysed. The results show that NIBB is better than conventional buck boost circuit in these aspects of electrical stress, power loss, cost, passive component volume, and so on. Two prototypes for the two converters with 10 kW/20 kHz were designed and simulated, respectively, for verifying the results. Analytical and simulated results confirmed the conclusions.
Highlights
There are many kinds of non-isolated DC–DC converters that can achieve both step-up and step-down power conversions, such as the conventional buck boost, Ćuk, Zeta, and Sepic
If the inductor works in continuous current mode (CCM), the minimum required inductance can be derived according to the energy balance relation
The volume of inductor can be qualitative compared by the area product (AP), where Imax refers to the maximum inductor current, and Bw, J, K0 are constants related to the shape and material of inductor [11]
Summary
There are many kinds of non-isolated DC–DC converters that can achieve both step-up and step-down power conversions, such as the conventional buck boost, Ćuk, Zeta, and Sepic. The NIBB converter, sometimes called four switch buck boost converter [2], is first proposed in 1998 [3]. As the NIBB converter has many advantages mentioned above, it is used in many applications such as PFC [4, 5], electric vehicle [6, 7], fuel-cell system [8], telecommunication, and photovoltaic systems. Many variations of this topology are proposed, such as zero voltage switching NIBB [9] and interleaved NIBB [7, 8]. The following sections will focus on the analysis and comparison of NIBB and the conventional buck boost circuit
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