Generalized nonisolated high step‐up DC‐DC converter with reduced voltage stress on devices

Abstract

SummaryIn this paper, a nonisolated high step‐up DC‐DC converter with low voltage stress on power devices is proposed. The proposed structure consists of a switch and n stages of inductor‐capacitor‐diode cells. The proposed topology combines the boost converter with the self‐lift circuit. Increasing the number of inductor‐capacitor‐diode cells leads to higher voltage gain with a small value of the switch duty cycle, which increases the controllability of the converter. Moreover, by increasing the number of stages, the normalized voltage stress of the power devices is reduced. As a consequence, the metal‐oxide‐semiconductor field‐effect transistor switch with low RDS‐on and devices with low nominal voltage can be used in the proposed converter. Furthermore, due to the existence of one switch, the proposed converter has a simple control system. The analysis of the voltage and current stresses of the power devices is carried out. The circuit performance is compared with other proposed topologies in the literature in voltage gain and normalized voltage stress. Finally, to evaluate the performance of the proposed converter, the experimental results are provided.

High step‐up DC‐DC converter with reduced voltage stress on devices

“…For D > 0.2, the converter has higher voltage gain in comparison with the proposed converter. For D > 0.5, the voltage gain of the proposed converter is higher than the converter . The converter has higher voltage gain in comparison with the proposed converter for D < 0.4.…”

“…For D > 0.5, the voltage gain of the proposed converter is higher than the converter. 26 The converter 29 has higher voltage gain in comparison with the proposed converter for D < 0.4. For all of the duty cycles, the proposed converter has a higher voltage gain compared with the converter.…”

“…The comparison between the normalized diodes voltage stress in the proposed converter and other structures is demonstrated in Figure C. The normalized voltage stress across the diodes in the proposed converter is lower than the converter D o 1, o 2, x 11, x 21 in and D o . in For M CCM < 14, the diodes D 11 and D 22 have higher normalized voltage stress compared with the proposed converter.…”

Single switch quadratic boost converter with continuous input current for high voltage applications

“…Also, the buck‐boost converter suffers from discontinuous input current; thus, a large input filter is necessary. This effect decreases power density of the converter and dynamic of the maximum power point tracking (MPPT) system in PV applications . The normal solution for a high voltage gain is the use of isolated DC‐DC converters since the turn ratio of the transformer can be adjusted to boost the voltage gain.…”

A zero‐current switching switched‐capacitor DC‐DC converter with reduction in cost, complexity, and size

“…Nowadays, DC‐DC converters are popular power electronic‐based circuits that have attracted many researchers' and industries' interests in various applications . The switched‐capacitor (SC) converters are of the most important DC‐DC converters, which are increasingly used because of their capabilities and features like lower electromagnetic interference (EMI), lighter weight, lower cost, higher energy density, and the potential for full integration .…”