Ultra‐high step‐down ZVS synchronous buck converter with low switch voltage stress

Asghari, Amin

doi:10.1049/iet-pel.2019.1113

Cited by 6 publications

(5 citation statements)

References 41 publications

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“…The introduced method in [23] requires two extra capacitors, one extra switch and one extra inductor for two-phase structure. In [24], two extra switches, three extra capacitors and two pairs of coupled inductors are used for two phases. The three-phase converter proposed in [25] uses five extra capacitors, four extra diodes and two extra inductors.…”

Section: Proposed Convertermentioning

confidence: 99%

A soft switching four‐phase converter with ultra‐high step down conversion ratio and automatic uniform current sharing

Asghari

2021

IET Power Electronics

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This paper introduces a new high step down four-phase converter with soft switching and automatic uniform current sharing. The phase number of the introduced topology can be expanded. In this converter, the main switches are turned on under zero voltage zero current switching condition and turned off under zero voltage switching. Also, the auxiliary switches and diodes operate respectively under zero voltage switching and zero current switching conditions. In the proposed architecture, the duty cycle is extended and the semiconductors voltage stress is reduced by applying series capacitors and coupled inductors. The leakage energy associated with the coupled inductors is absorbed and the reverse recovery losses of diodes are eliminated. Uniform current sharing between four phases is achieved without any extra current sharing control circuit. Furthermore, by utilizing the interleaved method, the current stress and the output current ripple are reduced. This converter provides above advantages while its input and output grounds are connected. As a result, the introduced topology can provide high step down conversions at high frequencies. The converter operation and its characteristics are analysed in detail. The accuracy of the theoretical analysis is verified by a laboratory prototype.

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Section: Proposed Convertermentioning

confidence: 99%

A soft switching four‐phase converter with ultra‐high step down conversion ratio and automatic uniform current sharing

Asghari

2021

IET Power Electronics

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“…To address these issues, researchers are currently working in the development of a variety of low-voltage DC-DC converters that can provide the necessary power to high-current DC applications. [1][2][3][4][5][6][7] In the subsequent section, a variety of buck converters that have been proposed and analyzed by researchers will be examined and discussed. Tapped inductor (TI) converters are a type of electronic converters that include a distinct branch in the winding path of the coupled inductor.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, buck converters encounter a number of obstacles, including conduction and switching losses, increased voltage stress on semiconductor devices, significant current fluctuations, and decreased efficiency relative to their typical operation. To address these issues, researchers are currently working in the development of a variety of low‐voltage DC‐DC converters that can provide the necessary power to high‐current DC applications 1–7 …”

Section: Introductionmentioning

confidence: 99%

Research and implementation of an innovative modular non‐isolated step‐down DC‐DC structure with continuous input current based on the Ćuk converter

Ghabeli Sani,

Banaei,

Hosseini

2023

Circuit Theory & Apps

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SummaryThis study proposes a new design for a non‐isolated buck converter with continuous input current. As required, the integration of additional modules into the existing structure permits a significant decrease in the converter's gain to attain significantly lower values. In order to create the proposed converter, the input voltage connections to the Ćuk converter were changed. In this configuration, the operational state of the Ćuk converter has been changed from buck‐boost to step‐down by connecting the input power source's negative polarity to the inductor's terminal. In addition, the proposed converter benefits from a common ground between the input source and output port. Moreover, it can achieve a significant reduction in gain by increasing the number of series modules. Finally, the compact converter was smoothly incorporated onto a printed circuit board (PCB) and afterward validated by an output power of 80 watts.

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“…Various soft-switching methods are proposed to reduce the switching losses and improve the efficiency of switching converters [12,13]. Moreover, soft-switching techniques can be used to reduce electromagnetic interference (EMI) by decreasing dv/dt and di/dt.…”

Section: Introductionmentioning

confidence: 99%

A new soft‐switching multi‐input quasi‐Z‐source converter for hybrid sources systems

Harchegani

Asghari

Jazaeri

2021

IET Renewable Power Gen

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This study focuses on a zero voltage transition multi-input quasi-Z-source converter (qZSC). This topology can be used for input sources with different voltages and currents to provide a constant output voltage. In the proposed structure, several qZSCs are combined and the output filter of all stages is eliminated. Therefore, the overall number of circuit elements, cost, volume and weight are reduced in comparison with when they are in a separate operation. In this converter, the soft-switching conditions are provided for all stages by using only one auxiliary circuit. The employed technique provides zero-voltage zero-current switching (ZVZCS) and zero-voltage switching for main switches at turnon and turn-off instants, respectively. The auxiliary switch turns on under zero-current switching and turns off under ZVZCS. Furthermore, the reverse recovery losses of diodes are reduced. The theoretical foundation of the proposed converter is presented and its performance is simulated by OrCAD software. The obtained results show 3.5% improvement in the efficiency at nominal loads, compared to its hard-switching counterpart. A dual-input prototype of the proposed structure is successfully built to support the validity of the theoretical analysis. 1Recently, the fuel crisis, global warming and environmental pollution are major factors in shifting to renewable energy sources. Moreover, the Kyoto Protocol promotes us to use clean energies including fuel cell, photovoltaic (PV), wind energy, and so forth. The most important capability of PV and wind energy sources is to serve the energy demand, even in distant or out of grid places and in densely populated areas [1].Renewable energy sources deliver various power in different environmental conditions such as different seasons and climates. Thereby, concurrent use of two or more energy sources is essential. In order to provide regulated voltage from several energy sources, different multi-input topologies have been proposed in recent years. In the multi-input converters (MICs), the number of passive elements and the current stress of semiconductors are reduced. High flexibility as well as better management in energy sources are other benefits of using MICs [2,3].The boost converter is used conventionally in the renewable energy section due to the continuous input current in 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.

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Ultra‐high step‐down ZVS synchronous buck converter with low switch voltage stress

Cited by 6 publications

References 41 publications

A soft switching four‐phase converter with ultra‐high step down conversion ratio and automatic uniform current sharing

A soft switching four‐phase converter with ultra‐high step down conversion ratio and automatic uniform current sharing

Research and implementation of an innovative modular non‐isolated step‐down DC‐DC structure with continuous input current based on the Ćuk converter

A new soft‐switching multi‐input quasi‐Z‐source converter for hybrid sources systems

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