Abstract
In many modern applications such as renewable energy sources (RESs), DC–DC step-up converters can be used to regulate the input variable and/or low voltage to achieve the desired characteristics such as amplitude and ripples at the output voltage. This article proposes a new transformer-less step-up DC–DC converter which, compared to previously presented converter topologies in the same class, can provide a higher variable voltage conversion ratio besides benefits such as decreased voltage stress on the switched-capacitors and power switches. Since the proposed topology is expandable, it can generate much higher voltage conversion ratios with lower, non-extreme duty-cycles which can be provided by a simple and cheap control circuit. The aforementioned advantages make the converter a suitable candidate for numerous industrial applications such as RES applications. Besides the voltage regulation applications, the proposed converter can be employed to extract the maximum power from RESs such as photovoltaic panels. To prove the converter performance, comprehensive comparisons and experiments are performed.
Highlights
Due to environmental concerns like global warming, increasing energy demand by consumers, and fossil fuel depletion, many countries have increased the share of renewable energy sources (RESs) in their power systems to supply the consumers
Due to multiple Switched capacitors (SCs) cells employed in the proposed converter, this converter can generate higher voltage conversion ratios by using lower duty-cycle and imposing lower voltage stress on its components, compared to the previously introduced DC–DC topologies
The performance of the proposed topology is validated by presenting comprehensive experimental results
Summary
Due to environmental concerns like global warming, increasing energy demand by consumers, and fossil fuel depletion, many countries have increased the share of renewable energy sources (RESs) in their power systems to supply the consumers. Due to multiple SC cells employed in the proposed converter, this converter can generate higher voltage conversion ratios by using lower duty-cycle and imposing lower voltage stress on its components, compared to the previously introduced DC–DC topologies. This makes the proposed topology suitable for applications with high power and/or voltage ratings, such as output voltage regulation of RESs. Unlike other step-up/down converters such as conventional Zeta and buckboost converters, and Zeta-based SC converters of [26,27,28], the proposed converter can be used for maximum power extraction in RESs like solar panels. Thorough comparisons, discussions, and experiments are conducted and presented
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