New transformer‐less DC–DC converter topologies with reduced voltage stress on capacitors and increased voltage conversion ratio

Abstract

This article proposes new transformer‐less step‐up/down and step‐up DC–DC topologies providing numerous merits such as less voltage stress on capacitors, lower duty‐cycle, and higher voltage conversion ratio compared to other DC–DC converters. The proposed converters are extendible by benefiting from several switched‐capacitors, making it possible to transfer more power from the converter. The proposed structures are more suitable for modern applications in which it is desirable to achieve high voltage gains by using non‐extreme duty‐cycles. For proving the analysis and claims, the detailed comparison and experimental results are presented. In the experiments, the dynamic performance of the proposed converters is also validated.

An improved nine‐level switched capacitor‐based inverter with voltage boosting capability and limitation of capacitor current spikes for PV applications

“…The standing voltage of the switches during this mode can be calculated as: (11) The current stress of on switches can be calculated as:…”

“…However, to employ and integrate these sources into the power systems, power electronic based interfaces, that is, power converters, are inevitable [7][8][9][10]. It is worth noting that besides RES applications, power converters are widely used in numerous modern applications [11][12][13]. Among these converters, multi-level inverters (MLI) are one of the most popular solutions to improve the performance of electric vehicles, renewable energy systems (RES) such as photovoltaic (PV) systems, and other power electronic devices in medium-and high-power applications [14][15][16][17][18].…”

A design for switched capacitor and single‐switch DC–DC boost converter by a small signal‐based PI controller

“…To achieve higher efficiency, adjacent inductor topologies using active or passive clamp structures are used. This technique gives a soft‐switching condition to the power switch 31–42 …”

“…This increases the size, cost, and weight of the system and complicates the control strategy. Abbasi et al 42 introduced a nonisolated step‐up/down DC–DC converter circuit. The introduced structure has lower voltage stress compared to other mentioned converters.…”

“…This technique gives a soft-switching condition to the power switch. [31][32][33][34][35][36][37][38][39][40][41][42] In Ahmad et al, 33 SC-based quasi-Z-source converter (qZSC) topology for DC microgrids is introduced. Abbasi et al 34 have proposed a new nonisolated step-up/down and step-up SC-based DC-DC converter topology.…”