Highly Efficient Single-Phase Direct AC-to-AC Converter With Reduced Semiconductor Count

Sharifi, Saeed; Monfared, Mohammad; Nikbahar, Ali

doi:10.1109/tie.2020.2970652

Cited by 33 publications

(24 citation statements)

References 29 publications

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“…The volume of the capacitor is directly related to its maximum stored energy [39]. Therefore, this parameter is calculated for the proposed converters based on ( 29) and (33) while for the competitors is obtained according to the parameters presented in Table I.…”

Section: ) Reactive Elements A) Capacitorsmentioning

confidence: 99%

“…From this model, any required transfer function can be attained readily. Therefore, by applying some KVLs and KCLs to this circuit while the input voltage is assumed constant, the transfer function of the control to the voltage of C1, Gvc1-d(s) is obtained as (39). The Proposed HS -YSI [23] DA -YSI [24] O-YSI [25] LCD-qYSI [26] Fig.…”

Section: Small Signal Analysismentioning

confidence: 99%

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Smooth DC-Link Y-Source Inverters: Suppression of Shoot-Through Current and Avoiding DC Magnetism

Nikbahar

Monfared

2022

IEEE Trans. Power Electron.

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The Y-source impedance network is truly referred to as the origin of the magnetically coupled impedance source (MCIS) inverters. The key characteristics, including high boost capability and design flexibility, are associated with the coupled inductor turn ratio. However, the magnetic element brings some practical challenges, such as voltage spikes, high shoot-through (ST) current, and bulky coupled inductors. This paper proposes two new Y-source inverters with clamped DC-link voltage. Due to the high boost ability, they are suitable for single-stage high gain inversions. Additionally, the significant reduction in the amplitude of the ST current leads to a reduction of the total power loss and capacity of the reactive component. Another attractive characteristic is that the Y-shaped coupled inductor's stored energy is no longer affected by the power rating of the converter, as a result of the zero dc magnetizing current. All these contribute to the high efficiency and power density of the proposed converters. The design guidelines of the components are presented and a thorough comparison with the state of the art is carried out. The achievements are then confirmed through extensive tests on a 500W laboratory setup.

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Section: ) Reactive Elements A) Capacitorsmentioning

confidence: 99%

Section: Small Signal Analysismentioning

confidence: 99%

Smooth DC-Link Y-Source Inverters: Suppression of Shoot-Through Current and Avoiding DC Magnetism

Nikbahar

Monfared

2022

IEEE Trans. Power Electron.

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“…The volume of a power converter is contributed by switching devices, heat sinks, and passive components. To compare the volumes of the proposed and counterpart buck-boost MCs [20]- [23], analytical methods in [21], [22], [30], and [31] are adapted to determine the switching devices power ratings and losses (which reflect the sizes of switching devices plus heat sinks) and stored energies of passive components (which reflect the volume of passive components). The buck-boost MC in [19] has already proved to have much higher switching devices power ratings/losses and passive component volumes [20], [21] and thus, not included for comparison.…”

Section: Comparative Evaluation Of Switching Devices Power Ratings/lo...mentioning

confidence: 99%

High-Efficiency Single-Phase Matrix Converter With Diverse Symmetric Bipolar Buck and Boost Operations

Ahmed

Moursi

Zahawi

et al. 2021

IEEE Trans. Power Electron.

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Single-phase matrix converters (MCs) are undergoing rapid developments due to their bipolar voltage gain (as required in dynamic voltage restorers) and step-changed frequency operation (used in high step-up ac-dc rectifiers, and to provide medium frequency isolation in traction and wind turbine converters, etc.). However, existing buck-boost MCs require high-voltage/current rating devices, and suffer from large component voltage/current stresses and ripples, significantly degrading their efficiency. This article proposes a highly efficient single-phase buck-boost MC; consisting of eight IGBTs (implemented using two full-bridge IGBT modules), second-order input and output filters, and a small value film capacitor. Efficient discrete inverting and noninverting buck and boost operations are proposed (same as that of sixteen-switch cascaded buck-boost MC) with significantly lower component voltage/current stresses and ripples. In addition, flexible inverting and noninverting buck-boost operations are proposed with independent control of buck and boost duty ratios. All of the proposed operations are free of commutation issues, compatible with reactive loads, and provide smooth input and output currents. Furthermore, all the switches have same voltage stresses, and all four switches in a full-bridge module experience the same current stresses. A comprehensive description of circuit operation is presented based on a number of proposed switch modulation strategies with a nonunity power factor load, followed by design guidelines, and comparative evaluations with existing topologies. Finally, experimental verification results are presented, using a 400-VA laboratory prototype converter.

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“…The production of the voltage and current stresses of a switching device is defined as its SDP, which can be regarded as a criterion for measuring the requirements of the semiconductors and consequently, a cost indicator of the system. The corresponding expressions are [38] ⎧ ⎪ ⎪ ⎨ ⎪ ⎪ ⎩ total peak SDP :…”

Section: Voltage and Current Stressesmentioning

confidence: 99%

A new enhanced‐boost switched‐capacitor quasi Z‐source network

Hosseini

Ghazi

Nikbahar

et al. 2020

IET Power Electronics

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This paper proposes a new enhanced-boost non-transformer-based impedance source network. The strong boosting ability of the proposed topology is realized by making use of the switched capacitor concept in the formerly introduced enhanced-boost quasi Z-source network (EB-qZSN) without any additional active switch. Meanwhile, the advantages of the EB-qZSN such as input current continuity and shared ground between the input and the output are maintained. In addition to the lower shoot-through requirement to obtain high voltage gains, the proposed impedance network takes advantage of a smaller size of passive components along with a lower input current ripple to achieve higher power density and higher efficiency. Moreover, the lower total rating of the switching elements, defined by switching device power, directly translates to lower cost for the proposed method. The operation principles and the design guideline of components are explained in detail and a thorough comparison with other ZSN is presented. A 240W DC-DC prototype converter was built to validate the performance principles and properties of the proposed impedance network. 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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Highly Efficient Single-Phase Direct AC-to-AC Converter With Reduced Semiconductor Count

Cited by 33 publications

References 29 publications

Smooth DC-Link Y-Source Inverters: Suppression of Shoot-Through Current and Avoiding DC Magnetism

Smooth DC-Link Y-Source Inverters: Suppression of Shoot-Through Current and Avoiding DC Magnetism

High-Efficiency Single-Phase Matrix Converter With Diverse Symmetric Bipolar Buck and Boost Operations

A new enhanced‐boost switched‐capacitor quasi Z‐source network

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