A new family of high gain boost DC‐DC converters with reduced switch voltage stress for renewable energy sources

Abstract

In this paper, a new family of non-isolated boost dc-dc converters with high voltage gains is proposed. The proposed boost topologies exhibit very high voltage gains at moderate duty cycles and lower switch voltage/current stresses with reduced component counts. Here, a total of four new non-isolated boost topologies are proposed using four-terminal PWM high-gain switch cells with an inductor-switch network. Among these four topologies, two converters have identical voltage gain with opposite load voltage polarities and likewise other two exhibit similar nature (i.e., equal but opposite load voltage) but have higher gain than the former topologies. The detailed operating principle, steady-state analysis, and design methodology are presented for the proposed positive output very high-gain converter, which can be easily extended to the rest of the topologies. An exhaustive comparison study has been presented for the proposed topologies with the existing step-up converters to highlight their advantages. Finally, the mathematical analysis, analytical studies, and high boosting feature of the proposed positive output high-gain boost converter are verified using a 250 W, 50 kHz prototype. The experimental results are presented for different duty cycles with fixed input voltage to verify the efficacy of the proposed structures in terms of higher boosting capability. K E Y W O R D Sboost dc-dc converter, energy sources, four-terminal PWM high-gain switch cell, high voltage gain, low switch voltage stress, renewable energy integration

A dual switches high step‐up DC–DC converter with low voltage stresses across switches

“…It is seen that the proposed converter outperforms almost all of the competitors except [29] and [38]. This comparison reveals that despite the proposed converter implements one or two higher number of components in comparison with the converters of [23,47,49,50,53]; however, the extra components have a more effective role in voltage gain extension.…”

“…Dual switches concept is another way to increase voltage gain and to decrease voltage/current stresses of the switches that have been applied into both of the transformerless [41][42][43][44][45][46][47][48] and CI-based [49][50][51][52][53] step-up DC-DC converters. In the transformer less converters through active SL cells the high voltage gain is provided.…”

Switched inductor‐capacitor‐based quasi‐Z source converter for renewable energy source integration

“…The capacitance of the proposed converter is calculated using the voltage ripple of the capacitor and the current expressions described during modes of operation as expressed in Equation (11).…”

“…Modified boost converters using SL, SC, VM, etc., are reported in literature to increase the gain of conventional boost converters 9–11 . A two‐inductor boost converter with VM and SC cells is reported to increase the voltage gain in Andrade et al 9 A family of high‐gain modified boost converter is reported in Shaw et al 11 In all these converters, even though the gain is increased compared to the conventional boost converters, there is still a limitation on the maximum voltage gain. To overcome this limitation, quadratic gain and modified quadratic gain converters are introduced 12–17 .…”

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“…In recent times, as per the demands of modern applications, certain highly efficient and reduced switch count structures have been developed with low switch voltage stress for non-isolated high gain DC-DC converters [4]. Some authors summarized the review of certain high step-up non-isolated DC-DC converters [5]- [7].…”