Methodology for synthesis of high‐gain step‐up DC–DC converters based on differential connections

Abstract

This paper presents a new methodology for synthesis of high-gain step-up DC-DC converters. This methodology is based on the differential connection of two basic non-isolated DC-DC converters, in which the output voltages are respectively positive and negative with reference to a common terminal. Any load connected between these positive and negative terminals is subjected to a differential voltage equivalent to the sum of the voltages individually synthetized by each basic converter. When only non-isolated basic DC-DC converters (boost, buck-boost, Cuk, single-ended primary-inductor converter, and Zeta) are considered, six differential converters may be derived by the proposed methodology; nevertheless, voltage lifting techniques based on gain cells can also be applied to further extend the gain, resulting in others high-gain topologies. Besides the proposition of the methodology, the paper investigates the operating principle of the derived converters under different modulation strategies, evaluates the possibility of eliminating redundant components after integration, and correlates the obtained converters with already existing topologies. In fact, it is demonstrated that several high-gain step-up DC-DC converters previously published could be addressed as particular cases of differential connections of basic converters. Experimental results are presented to validate the methodology herein proposed.

Partial Power Processing and Efficiency Analysis of dc-dc Differential Converters

“…Unfortunately, these sources provide low output voltages when compared to the peak value of grid voltage, therefore high gain step-up dc-dc converters are required to efficiently comply with the requirements for grid connection [4]. In light of this, the literature has presented several topologies of high gain step-up dc-dc converters in the past few years [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

“…Recently, non-isolated topologies based on the differential connections between basic converters were introduced by [19][20][21]. This kind of connection is composed of two stages and it provides higher voltage gain with a lower duty cycle value, which can improve efficiency when compared to a one-stage converter.…”

Development of ripple reduced solar photovoltaic regulators using boomerang sliding mode control strategy

“…Pertaining to the nonlinear dynamic stability, a comprehensive literature on sliding mode controller (SMC) methodologies are carried out in other studies 4–6 . In recent years, the idea of SMC has been widely considered in power converters for its robustness and enhanced line/load regulation capacities 7 . However, it suffers from linearized modeling with delayed reaching phase, prolonged convergence, and chattering phenomenon 8 .…”

Conversor CC-CC Buck-Boost Diferencial Simétrico

“…Recentemente, [21], [22] propuseram a utilização da conexão diferencial entre conversores básicos como uma alternativa à derivação de topologias capazes de prover ganhos estáticos elevados. Os autores dividiram os conversores cc-cc básicos não isolados em dois grupos, em função da polaridade da tensão de saída e em relação à de entrada.…”

“…O grupo chamado de positivo inclui os conversores Buck, Boost, SEPIC e Zeta, enquanto o grupo negativo inclui os conversores Buck-Boost e Ćuk. Em [21] é feita uma extensa análise dos conversores de alto ganho derivados da conexão diferencial entre um conversor do grupo positivo e outro do grupo negativo. Os autores avaliam as topologias geradas a partir do ganho estático, esforços de tensão e possiblidade de eliminação de componentes redundantes.…”