Voltage Lifting Techniques for Non-Isolated DC/DC Converters

Abstract

This paper presents a comprehensive review that highlights the characteristics of non-isolated step-up converters based on high boost voltage lifting techniques. The paper categorises the high boost techniques: multistage/multilevel, switched capacitor, voltage multiplier, voltage lift, switched inductor and magnetic coupling. The paper also discusses in detail the advantages and disadvantages for each category such as cost, complexity, power density, reliability and efficiency. The number of passive and active components, voltage gain, voltage stress, switching frequency, efficiency and power rating are also compared. Although the paper considers coupling inductors in the context of the non-isolated converter, the focus of the entire article is on the non-isolated high voltage step-up techniques. The key contribution in this paper is the review of high boosting techniques rather than the DC /DC converters. This allows divergence of new ideas and new power converters that will help provide highly efficient and flexible power converters for several applications where the sending end voltage is very low as photovoltaic systems. In addition, many applications and control techniques of DC/DC converters are summarised in this paper.

A Multilevel Boost Converter with Reduced Inductor Current

“…We crease the number of turns to increase the inductance, but this would reduce th mum current through the wire, which can be defined as (3): A feasible DC-DC topology solution to generate a large voltage gain consists of the cascade connection of two boost converters (the second converter's input is the first converter's output). In recent works, some DC-DC converters producing large voltage gains have been proposed, for instance, converters with input-parallel output-series connections, cascaded converters, and converters that are based on voltage lift techniques, among others [7][8][9][10].…”

“…The output voltage of the proposed converter is obtained by adding the input voltage v g to the voltage v C2 . Hence, Equation (8) gives the output voltage of the suggested converter:…”

Inductor-Diode Boosting Technique of 3QBC Converters Family with Single-Active Switch

“…As a result, there is a high demand for their use in various applications. Indeed, RESs are an effective solution for traditional power systems because of their reliability and widespread, making them riskfree [1], [2]. In addition, they can be produced locally, helping to alleviate dependence on fossil fuels [3].…”

“…In literature [1], [4]- [9], many non-isolated or isolated topologies are employed in the RES for providing high voltage gain. Due to its simple structure and fewer components, the conventional boost converter (CBC) can be used to achieve high voltage conversion ratio.…”

“…Providing a step-up DC/DC converter with significant voltage enhancement while avoiding extremely high-duty cycles can be categorised into using more than one switch, coupled inductor or transformer, and boosting techniques such as SC, SL and VL. [1]. Using more than one switch can be one of the solutions to attain a high voltage gain.…”