Nonisolated Integrated Boost Featured (NIIBF) Multi-Input Ultrahigh Gain DC–DC Converter
Obulapathi Balapanuru, Makarand M. Lokhande, Mohan V. Aware
Abstract
The non-isolated multi-input topologies are restricted to low voltage gain relative to single-input topologies. To achieve high voltage gain, coupled inductor, and various voltage boosting techniques (such as switched inductors/capacitors) are used in the literature. The voltage boosting structures increase the total component count, size, and cost of the converter. The operational limitations are observed in coupled inductor based converters due to peak current at source side. This work proposes, a Non-Isolated Integrated Boost Featured (NIIBF) converter without using coupled inductor, and voltage boosting techniques. It achieves ultrahigh voltage gain with three basic boost cells, over other reported converters in two-input category, with less component count and low Average Normalized Voltage Stress (ANVS). It also facilitates flexible operating possibilities such as single-input, multi-input, and energy transfer capability amongst input ports. Further, with equal duty cycle control ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$ D_{1}=D_{2}=D_{3}$</tex-math></inline-formula> ), the power management between the energy storage systems is inherently provided by the proposed topological structure. The control complexity is minimized in a modified control algorithm. Hence, integration of various energy storage systems is simplified. A hardware prototype is developed to validate the functional capability of the proposed converter.