Interleaved non‐isolated DC–DC converter for ultra‐high step‐up applications

Abstract

This study presents a novel interleaved non‐isolated converter for ultra‐high step‐up applications. This circuit utilises coupled inductor and voltage‐lift techniques to achieve high voltage gain. In the proposed converter, the configuration of interleaved technique and winding‐cross‐coupled inductors not only reduces the input current ripple and current stress of semiconductor devices but also increases the voltage gain. Further, using voltage‐lift technique helps to reach a very high voltage conversion ratio with low turn ratio and proper duty cycle. Since the voltage stress of semiconductor devices is low enough, low on resistance switches and low voltage ultra‐fast recovery diodes are used. For this converter, high voltage gain, low conduction losses, low reverse recovery losses, high efficiency, low input current ripple, small volume and reduced cost are provided. Therefore, the proposed converter is a good choice for ultra‐high step‐up applications. The implemented 100 W laboratory prototype circuit with 18 V input voltage and unity turn ratio of coupled inductors reaches 360 V output voltage and 94.7% efficiency which validates the accuracy of theoretical analysis.

Design of an Interleaved High Step-Up DC-DC Converter with Multiple Magnetic Devices for Renewable Energy Systems Applications

“…To use high voltage gain converters at high power, minimize the input current ripple, and increase reliability, interleaved converters have been introduced. e abovementioned structures (i.e., SC, CI, and VMC) are adopted to interleaved topologies to achieve high step-up voltage gain [27][28][29][30][31][32][33][34][35][36][37][38][39]. An interleaved boost converter with a bi-fold Dickson voltage multiplier is presented in [40], in which several diodes and capacitors are employed to increase the overall voltage gain.…”

Efficient interleaved high step‐up converter with wide load range soft switching operation

“…Isolation in the HSU topologies increases the system volume, loss and cost [2]. Therefore, in the applications where the electrical isolation is not obligatory, it is preferred to utilize non-isolated structures [3,7]. The most investigated non-isolated HSU converters are those which employ coupled inductors (CIs) to easily alter the voltage gain by adjusting the CIs turns ratio [2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

“…Therefore, in the applications where the electrical isolation is not obligatory, it is preferred to utilize non-isolated structures [3,7]. The most investigated non-isolated HSU converters are those which employ coupled inductors (CIs) to easily alter the voltage gain by adjusting the CIs turns ratio [2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In many CIs-based HSU converters, in order to reduce the input current ripple, interleaving along with winding-cross-coupled inductors (WCCIs) techniques are utilized [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

“…The most investigated non-isolated HSU converters are those which employ coupled inductors (CIs) to easily alter the voltage gain by adjusting the CIs turns ratio [2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In many CIs-based HSU converters, in order to reduce the input current ripple, interleaving along with winding-cross-coupled inductors (WCCIs) techniques are utilized [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Interleaving method also reduces the elements current stress and passive components size while improving the transient response and heat distribution [12].…”

A high step‐up DC–DC converter with active switched LC‐network and voltage‐lift circuit: Topology, operating principle, and implementation

“…Applications of renewable energy systems (RESs) such as fuel cells (FCs), wind turbines (WTs), and photovoltaic (PV) generations have experienced significant advancements in power electronics. 1 Merging these sources and achieving effective energy/power management is available by DC micro grids (MGs). Low energy conversion stages, no frequency, and lack of reactive power are the main advantages of DC MGs.…”