New family of expandable step‐up/‐down DC‐DC converters with increased voltage gain and decreased voltage stress on capacitors

Abstract

Summary This paper presents a new family of extendible hybrid and nonhybrid step‐up/‐down switched capacitor DC‐DC converter structures benefiting from numerous advantages like lower voltage stress on switched capacitors, fewer power components like switches, and higher voltage gain compared with other converters. In the proposed family, it is aimed to use diodes rather than switches, since they are simpler, cheaper, and smaller than switches, which in turn makes the proposed converters cost‐, weight‐, and size‐effective structures. Also, because of the existence of multiple switched capacitors, more power can be transferred from the input source to the load (output) in the proposed topologies. In general, the proposed hybrid and nonhybrid structures are more suitable for a vast variety of industrial applications like regulating output voltage of renewable energy sources, specifically in high power ratings and high voltage gains. For validating the proposed ideas, thorough comparisons and experiments are presented.

A transformerless high gain dc–dc boost converter with reduced voltage stress

“…31. New step‐up converters with desirable features like low stress 32 and multi‐input operation 33 are introduced and investigated by authors.…”

A new transformer‐less step‐up DC–DC converter with high voltage gain and reduced voltage stress on switched‐capacitors and power switches for renewable energy source applications

“…In Figure 8, the experimental circuit of the proposed converter is presented. In this set-up, 47N60C Proposed converter, [28], non-hybrid Cuk/Zeta up/down of [26,27] Voltage gain Proposed converter > [30] < Hybrid Zeta up/down of [26,27] < Hybrid and non-hybrid Cuk up/down of [27,26] Proposed converter For D ≥ 0.7: Zeta up/down of [18][19][20]≃ Proposed converter <…”

New transformer‐less DC–DC converter topologies with reduced voltage stress on capacitors and increased voltage conversion ratio

“…As seen, the proposed non‐hybrid converters and the non‐hybrid step‐up/down converters presented in [17–19] have the minimum number of passive components. The proposed hybrid converters and the hybrid topologies of [17–19] employ a similar number of passive components and share the second place. Moreover, compared to the converters of [6, 7], the proposed topologies have excessively fewer passive components, making them much more cost‐, weight‐ and size‐effective.…”

“…The proposed structures can provide close or better efficiencies as compared with the others. As seen, among the proposed converters, the proposed SC Cuk‐/Zeta‐based converters provide the highest efficiencies after the conventional Zeta, conventional Cuk and the step up/down Zeta‐ and Cuk‐based converters of [17–19].…”