Soft Switching Interleaved High Step-Up Converter With Multifunction Coupled Inductors

Akhlaghi, Baharak; Farzanehfard, Hosein

doi:10.1109/jestie.2020.3033542

Cited by 17 publications

(26 citation statements)

References 25 publications

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“…Renewable energy sources such as solar energy and wind energy are the best response to these growing demands. Among different types of renewable energy sources, photovoltaic (PV) energy is one of the most attractive types of clean energy sources [1]- [4]. Usually, the PV array terminal voltage is low.…”

Section: Introductionmentioning

confidence: 99%

Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

et al. 2021

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This paper introduces eight novel interleaved non-isolated dc-dc converters with ultra-high step-up and zero voltage switching (ZVS) capabilities for renewable energy systems. To increase the voltage gain, the proposed converters benefit coupled inductors, high-frequency (HF) transformer, and voltage multiplier (VM) techniques. In comparison to other converters, which just benefit coupled inductors or HF transformers, these combinations of the techniques make an additional degree of freedom to achieve high voltage gains (more than 25 without extreme duty cycle). Besides, two active clamp circuits, including two stages of switch-capacitor VM cells, not only increase the voltage gain of the proposed converters but also act as an auxiliary circuit to provide ZVS. Moreover, the stored energy in the leakage inductances is absorbed and passed to the output by the clamp capacitors. The input current ripple is reduced by applying the interleaved technique. The voltage stress es across the power switches are clamped to lower values and can be controlled by the turn ratios of the coupled inductors and the HF transformer. The theoretical performance of the proposed converters is fully explained. Also, the proposed converters are compared with more than twenty latest interleaved high step-up and ultra-high step-up dc-dc converters. Finally, a 1 kW, 20 V/500 V laboratory prototype is built to prove the advantages of the proposed converters.INDEX TERMS Interleaved structure, dc-dc converter, ultra-high step-up converter, zero-voltage switching

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Section: Introductionmentioning

confidence: 99%

Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

et al. 2021

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“…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].…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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

Akhlaghi

Farzanehfard

2022

IET Power Electronics

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The output voltage of the renewable energy resources such as photovoltaic and fuel cell systems is relatively low. Therefore, in the renewable energy‐based power generation systems, high step‐up (HSU) DC‐DC converters are demanded between the renewable energy resource and the grid. The required characteristics of such HSU converters are low size, cost, number of elements, current ripple, and high efficiency. In response, in this paper, a new non‐isolated HSU converter with interleaved structure and resonant operation is presented. The proposed converter achieves high voltage gain and full soft switching performance over a wide range of load variations while utilizing low number of components. In this converter, the voltage gain is adjusted by tuning the coupled inductors turns ratio and the resonant frequency. The semiconductors voltage stress is low in comparison to the other counterpart converters with resonant operation. Also, the converter uses interleaving technique to reduce the input current ripple. Comprehensive theoretical analysis of the converter is presented and its performance is compared with the recent counterparts. In order to validate the converter effectiveness, a laboratory prototype is implemented and the experimental results are provided.

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“…However, the conventional interleaved flyback converter has some disadvantages like as high switching losses and low power density. When the switching frequency increases, therefore it causes to reduction volume of the converter [4]. When the switching frequency increases, subsequently it causes difficulties like as switching losses as well as electromagnetic interferences (EMI) for the converter.…”

Section: Introductionmentioning

confidence: 99%

A new zero voltage transition interleaved flyback converter

Peiravan

Delshad

Amini

2022

IJPEDS

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The paper introduced a new zero voltage transition (ZVT) interleaved flyback converter which has two similar flyback converters. Two flyback converters are in parallel connection and auxiliary circuit in this converter provides ZVT condition for all of the main switches and also provides zero current switching and zero voltage zero current switching (ZVZCS) conditions for the auxiliary switch. Also, ZCS conditions are created for diodes turning off, so reverse recovery problem is solved. The auxiliary circuit in the suggested converter is modular, and by adding parallel branches to the flyback circuit, this circuit can provide soft switching conditions for all switches without significantly change. A complete analysis of the converter is provided and its operating intervals are explained. A 180 W laboratory prototype of the converter is made to approve the theoretical calculations. The experimental results show 7.7% increase in efficiency.

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Soft Switching Interleaved High Step-Up Converter With Multifunction Coupled Inductors

Cited by 17 publications

References 25 publications

Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

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

A new zero voltage transition interleaved flyback converter

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