Nonisolated Integrated Boost Featured (NIIBF) Multi-Input Ultrahigh Gain DC-DC Converter

The nonisolated 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 a source side. This work proposes a nonisolated integrated boost featured converter without using a coupled inductor and voltage-boosting techniques. It achieves ultrahigh voltage gain with three basic boost cells, over other reported converters in a two-input category, with less component count and low average normalized voltage stress. It also facilitates flexible operating possibilities such as single-input, multi-input, and energy transfer capability among input ports. Furthermore, with equal duty cycle control (D-1=D-2=D-3), 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, the integration of various energy storage systems is simplified. A hardware prototype is developed to validate the functional capability of the proposed converter.