A new transformer‐less step‐up DC–DC converter with high voltage gain and reduced voltage stress on switched‐capacitors and power switches for renewable energy source applications

Abstract

In many modern applications such as renewable energy sources (RESs), DC-DC step-up converters can be used to regulate the input variable and/or low voltage to achieve the desired characteristics such as amplitude and ripples at the output voltage. This article proposes a new transformer-less step-up DC-DC converter which, compared to previously presented converter topologies in the same class, can provide a higher variable voltage conversion ratio besides benefits such as decreased voltage stress on the switched-capacitors and power switches. Since the proposed topology is expandable, it can generate much higher voltage conversion ratios with lower, non-extreme duty-cycles which can be provided by a simple and cheap control circuit. The aforementioned advantages make the converter a suitable candidate for numerous industrial applications such as RES applications. Besides the voltage regulation applications, the proposed converter can be employed to extract the maximum power from RESs such as photovoltaic panels. To prove the converter performance, comprehensive comparisons and experiments are performed.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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

“…Converter in Maalandish et al 40 has totally 33 elements where the circuits in Abbasi et al 34 and Varesi et al 41 contain 10 power components in its internal topology. Meanwhile, the structures in Zhang et al, 37 Vosoughi Kurdkandi et al, 39 and Maalandish et al 40 have four inductors, and circuit in Maalandish et al 38 has only one inductor. Inductor is among the important devices that loss the power.…”

“…Therefore, the number of this component is desired to be fewer. Also, Abbasi et al 38 and Maalandish et al 40 include five and four power switches. Other topologies have one, two, or three switches.…”

“…According to different duty cycles, different levels of the voltages have been gained based on Table 2. Figure 18A presents the state of the voltage stress for Abbasi et al 38 This converter presents a good performance, and by increasing the voltage across the load, the voltage for the main power switch is decreasing, where for , for 750 VDC as the output voltage, the voltage stress for the switch is equal to 650 VDC. For lower duty cycles the differences between these voltages are less and for example for , 300 and 200 VDC have been gained for output voltage and the voltage across the switch respectively.…”

“…Comparison the voltage stress for main power switches for converter topologies presented in (A) Abbasi et al, 38 (B) Varesi and Ghorbani, 36 (C) Amir et al, 50 and (D) proposed converter…”

“…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 …”