High-Efficiency Single-Phase AC–AC Converters Without Commutation Problem

Khan, Ashraf Ali; Cha, Honnyong; Ahmed, Hafiz Furqan

doi:10.1109/tpel.2015.2494605

Cited by 82 publications

(36 citation statements)

References 37 publications

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“…Research on control algorithms is mainly related to increasing efficiency, identifying faults, and optimizing their operation during component failures. New system structures are also being developed that produce significantly better properties regarding efficiency and power density [43,44].…”

Section: The Development Of Modulation Methodsmentioning

confidence: 99%

Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link

Szcześniak

2019

Energies

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AC/AC converters that do not have a DC energy storage element, such as a matrix chopper and a matrix converter, are increasingly becoming alternatives to conventional two-stage AC/DC/AC converters and thyristor choppers. In such systems, the main DC-link capacitor does not exist, so the system provides more reliable operation and makes it possible to reduce the financial costs of its construction. It should be noted that AC/AC converters without an energy storage element in a form of DC-link capacitors have not been implemented on an industrial scale. The reasons involve technical aspects and cost components. The main aim of this paper is to present some of the challenges and selected design requirements for industrial applications of AC/AC high reliability power converters.

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Section: The Development Of Modulation Methodsmentioning

confidence: 99%

Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link

Szcześniak

2019

Energies

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“…However in practical, there are unavoidable dead and/or overlap times due to non-instantaneous behavior of the power semiconductor switches and also delay in gate driver circuits. During dead times, the inductor current would be interrupted which generates high voltage spikes in the circuit, while in overlap times the power source is shorted giving rise to high current spikes, i.e., commutation problems [10,17]. The high voltage and current spikes will severely damage the semiconductor switches [20].…”

Section: Pwm Control Of Ac-ac Buck Convertermentioning

confidence: 99%

“…Several strategies have been reported with the aim to solve the commutation problems. A convenient method to allow finite dead times is adding resistorcapacitor snubbers, which however are bulky and also degrade the efficiency and power quality [16,17]. Soft commutation methods based on the polarity of voltage/current have been proposed in [13,18,19] and [20] to provide alternate current paths during dead times, but they would be unreliable around voltage zero-crossing points.…”

Section: Introductionmentioning

confidence: 99%

“…Soft commutation methods based on the polarity of voltage/current have been proposed in [13,18,19] and [20] to provide alternate current paths during dead times, but they would be unreliable around voltage zero-crossing points. Recent efforts have been made to reconfigure the switching legs which greatly relieve the commutation issues [17,21,22]. Nonetheless, a few additional inductors and capacitors are necessary which increase the volume, decrease efficiency, and even bring stability problems [22].…”

Section: Introductionmentioning

confidence: 99%

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Reliable Control of Direct PWM AC-AC Buck Converter With Short Circuit Protection

Wang

McMahon

2019

2019 IEEE 28th International Symposium on Industrial Electronics (ISIE)

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In this paper, a reliable control strategy is proposed for the direct pulse-width-modulation (PWM) ac-ac buck converter, to address the commutation problems and also to offer a handling capability against short circuit faults. A number of states are defined for the switching of the ac-ac converter depending on the sensed input voltage, whereby safe and continuous current paths are maintained at all times including voltage zero-crossing points. Moreover, fault handing switching states are able to protect the converter against short circuit currents. Safe transitions between different states are achieved as well. The realization of the control method is introduced and analyzed in detail. Measured results from experiments confirm that the proposed strategy manages to provide a safe and smooth operation for the ac-ac buck converter even under short circuit faults.

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“…This one-stage converter can simplify the controller design with a low switching frequency without reverse power flow [33]. The switches S1 and S2 are mainly used to control the power flow, and the S3 and S4 operate to constitute the resonant loop during the S1 and S2 OFF.…”

Section: Single-phase Ac-ac Convertermentioning

confidence: 99%

An Overview of Resonant Circuits for Wireless Power Transfer

et al. 2017

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Abstract:With ever-increasing concerns for the safety and convenience of the power supply, there is a fast growing interest in wireless power transfer (WPT) for industrial devices, consumer electronics, and electric vehicles (EVs). As the resonant circuit is one of the cores of both the near-field and far-field WPT systems, it is a pressing need for researchers to develop a high-efficiency high-frequency resonant circuit, especially for the mid-range near-field WPT system. In this paper, an overview of resonant circuits for the near-field WPT system is presented, with emphasis on the non-resonant converters with a resonant tank and resonant inverters with a resonant tank as well as compensation networks and selective resonant circuits. Moreover, some key issues including the zero-voltage switching, zero-voltage derivative switching and total harmonic distortion are addressed. With the increasing usage of wireless charging for EVs, bidirectional resonant inverters for WPT based vehicle-to-grid systems are elaborated.

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High-Efficiency Single-Phase AC–AC Converters Without Commutation Problem

Cited by 82 publications

References 37 publications

Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link

Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link

Reliable Control of Direct PWM AC-AC Buck Converter With Short Circuit Protection

An Overview of Resonant Circuits for Wireless Power Transfer

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