Research

14 pages, 6412 KiB

Open AccessArticle

A Novel Carrier Scheme Combined with DPWM Technique in a ZVS Grid-Connected Three-Phase Inverter

by Yi-Hung Liao, Jiong-Ye Chen and Ying Zhou

Electronics 2022, 11(4), 656; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics11040656 - 19 Feb 2022

Cited by 1 | Viewed by 1703

In this paper, a novel switching scheme using discontinuous pulse-width modulation (DPWM) for a zero-voltage switching (ZVS) grid-connected three-phase inverter is proposed. ZVS in the main and auxiliary switches was achieved. Moreover, the reverse recovery currents of the anti-parallel diodes in the main [...] Read more.

In this paper, a novel switching scheme using discontinuous pulse-width modulation (DPWM) for a zero-voltage switching (ZVS) grid-connected three-phase inverter is proposed. ZVS in the main and auxiliary switches was achieved. Moreover, the reverse recovery currents of the anti-parallel diodes in the main switches were suppressed. A circuit analysis was performed, and a simulation was carried out. Furthermore, a prototype of the ZVS grid-connected three-phase inverter was constructed to verify the effectiveness of the proposed PWM control scheme. Both the simulation and experimental results verified the validity of the proposed PWM control scheme. Full article

(This article belongs to the Special Issue High Performance Power Converters: Design, Control, Devices and Applications)

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13 pages, 5520 KiB

Open AccessArticle

Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction

by Sang-Won Lee and Young-Kyun Cho

Electronics 2021, 10(21), 2615; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics10212615 - 26 Oct 2021

Viewed by 1851

Abstract

This paper proposes a single-stage wireless battery charging circuit with a coupling coefficient prediction method. The proposed circuit consists of only two stages: full bridge inverter with transmitter coil in the first stage and full bridge rectifier with receiver coil in the second [...] Read more.

This paper proposes a single-stage wireless battery charging circuit with a coupling coefficient prediction method. The proposed circuit consists of only two stages: full bridge inverter with transmitter coil in the first stage and full bridge rectifier with receiver coil in the second stage. This circuit implements the constant current (CC) charging mode at the resonant frequency of two coils and the constant voltage (CV) charging mode at a specific frequency that is dependent on the coupling coefficient of two coils. The operation at a specific frequency guarantees the CV operation regardless of load condition and reduces the switching losses than the operation at the resonant frequency owing to a zero-voltage switching (ZVS) operation. In CC-CV modes, the phase-shift technique is additionally applied to improve the output voltage/current regulation. Unlike other approaches, the proposed single-stage wireless battery charging circuit does not require multiple stages of power conversion, or additional components, a pre-measured coupling coefficient or a complex control algorithm for CC-CV charging operation. The prototype proposed circuit was tested under various coil alignment conditions, and successfully implemented the CC-CV charging operation for a 36 V battery pack. The predicted coupling coefficient had an error of ≤0.62% in the coil alignment condition, and the circuit had errors of ≤0.32%, ≤0.1% in the output current and voltage regulation, respectively. Full article

(This article belongs to the Special Issue High Performance Power Converters: Design, Control, Devices and Applications)

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13 pages, 5910 KiB

Open AccessArticle

Two-Stage Modulation Study for DAB Converter

by Pablo Guzmán, Nimrod Vázquez, Marco Liserre, Rodolfo Orosco, Sergio Enrique Pinto Castillo and Claudia Hernández

Electronics 2021, 10(21), 2561; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics10212561 - 20 Oct 2021

Cited by 2 | Viewed by 2907

Abstract

The dual active bridge (DAB) is a dc/dc converter frequently employed in multiple applications due to its advantages of isolation, power flexibility, and input and output voltage defined by design. Different multi-phase modulations have been reported to increase DAB efficiency and reduce components [...] Read more.

The dual active bridge (DAB) is a dc/dc converter frequently employed in multiple applications due to its advantages of isolation, power flexibility, and input and output voltage defined by design. Different multi-phase modulations have been reported to increase DAB efficiency and reduce components stress but, certainly, the control and implementation complexity increases with every displacement angle added because of the multiple variable measurements. This paper presents two-stage modulations based on the single phase-shift (SPS), which allows maintaining simplicity while improving the efficiency of the DAB converter depending on the design conditions. The paper also gives a direction for selecting the proper modulation to achieve the best efficiency for each situation. The different two-stage modulations are described, analyzed, and experimentally tested. Full article

(This article belongs to the Special Issue High Performance Power Converters: Design, Control, Devices and Applications)

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13 pages, 3787 KiB

Open AccessArticle

Analysis and Design for Output Voltage Regulation in Constant-on-Time-Controlled Fly-Buck Converter

by Younghoon Cho and Paul Jang

Electronics 2021, 10(16), 1886; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics10161886 - 06 Aug 2021

Cited by 2 | Viewed by 2372

Abstract

Fly-buck converter is a multi-output converter with the structure of a synchronous buck converter structure on the primary side and a flyback converter structure on the secondary side, and can be utilized in various applications due to its many advantages. In terms of [...] Read more.

Fly-buck converter is a multi-output converter with the structure of a synchronous buck converter structure on the primary side and a flyback converter structure on the secondary side, and can be utilized in various applications due to its many advantages. In terms of control, the primary side of the fly-buck converter has the same structure as a synchronous buck converter, allowing the constant-on-time (COT) control to be applied to the fly-buck converter. However, due to the inherent energy transfer principle, the primary-side output voltage regulation of COT controlled fly-buck converters may be poor, which can deteriorate the overall converter performance. Therefore, the primary output capacitor must be carefully designed to improve the voltage regulation characteristics. In this paper, a theoretical analysis of the output voltage regulation in COT controlled fly-buck converter is conducted, and based on this, a design guideline for the primary output capacitor considering the output voltage regulation is presented. The validity of the analysis and design guidelines was verified using a 5 W prototype of the COT controlled fly-buck converter for telecommunication auxiliary power supply. Full article

(This article belongs to the Special Issue High Performance Power Converters: Design, Control, Devices and Applications)

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13 pages, 4137 KiB

Open AccessArticle

High Power Density, High-Voltage Parallel Resonant Converter Using Parasitic Capacitance on the Secondary Side of a Transformer

by Jaean Kwon and Rae-Young Kim

Electronics 2021, 10(14), 1736; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics10141736 - 19 Jul 2021

Cited by 5 | Viewed by 2659

Abstract

High-voltage DC power supplies are used in several applications, including X-ray, plasma, electrostatic precipitator, and capacitor charging. However, such a high-voltage power supply has problems, such as a decrease in reliability, owing to an increase in output ripple voltage, and a decrease in [...] Read more.

High-voltage DC power supplies are used in several applications, including X-ray, plasma, electrostatic precipitator, and capacitor charging. However, such a high-voltage power supply has problems, such as a decrease in reliability, owing to an increase in output ripple voltage, and a decrease in power density, owing to an increase in volume. Therefore, this study proposes a method for improving the power density of a parallel resonant converter using the parasitic capacitor of the secondary side of the transformer. Due to the fact that high-voltage power supplies have many turns on the secondary side, a significant number of parasitic capacitors are generated. In addition, in the case of a parallel resonant converter, because the transformer and the primary resonant capacitor are connected in parallel, the parasitic capacitor component generated on the secondary side of the transformer can be equalized and used. A parallel cap-less resonant converter structure developed using the parasitic components of such transformers is proposed. Primary side and secondary side equivalent model analyses are conducted in order to derive new equations and gain waveforms. Finally, the validity of the proposed structure is verified experimentally. Full article

(This article belongs to the Special Issue High Performance Power Converters: Design, Control, Devices and Applications)

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14 pages, 13610 KiB

Open AccessArticle

Lumped Parameter Modeling Based Power Loop Analysis Technique of Power Circuit Board with Wide Conduction Area for WBG Semiconductors

by Gi-Young Lee, Min-Shin Cho and Rae-Young Kim

Electronics 2021, 10(14), 1722; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics10141722 - 18 Jul 2021

Cited by 1 | Viewed by 2204

Abstract

With the development of wide-bandgap (WBG) power semiconductor technology, such as silicon carbide (SiC) and gallium nitride (GaN), the technology of power converters with high efficiency and high-power density is rapidly developing. However, due to the high rate-of-rise of voltage (dv/dt) [...] Read more.

With the development of wide-bandgap (WBG) power semiconductor technology, such as silicon carbide (SiC) and gallium nitride (GaN), the technology of power converters with high efficiency and high-power density is rapidly developing. However, due to the high rate-of-rise of voltage (dv/dt) and of current (di/dt), compared to conventional Si-based power semiconductor devices, the reliability of the device is greatly affected by the parasitic inductance component in the switching loop. In this paper, we propose a power loop analysis method based on lumped parameter modeling of a power circuit board with a wide conduction area for WBG power semiconductors. The proposed analysis technique is modeled based on lumped parameters, so that power loops with various current paths can be analyzed; thus, the analysis is intuitive, easy to apply and realizes dynamic power loop analysis. Through the proposed analysis technique, it is possible to derive the effective parasitic inductance component for the main points in the power circuit board. The effectiveness of the lumped parameter model is verified through PSpice and Ansys Q3D simulation results. Full article

(This article belongs to the Special Issue High Performance Power Converters: Design, Control, Devices and Applications)

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19 pages, 8615 KiB

Open AccessArticle

Sensorless PMSM Drive Inductance Estimation Based on a Data-Driven Approach

by Gwangmin Park, Gyeongil Kim and Bon-Gwan Gu

Electronics 2021, 10(7), 791; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics10070791 - 26 Mar 2021

Cited by 11 | Viewed by 2499

Abstract

In the permanent magnet synchronous motor (PMSM) sensorless drive method, motor inductance is a decisive parameter for rotor position estimation. Due to core magnetic saturation, the motor current easily invokes inductance variation and degrades rotor position estimation accuracy. For a constant load torque, [...] Read more.

In the permanent magnet synchronous motor (PMSM) sensorless drive method, motor inductance is a decisive parameter for rotor position estimation. Due to core magnetic saturation, the motor current easily invokes inductance variation and degrades rotor position estimation accuracy. For a constant load torque, saturated inductance and inductance error in the sensorless drive method are constant. Inductance error results in constant rotor position estimation error and minor degradations, such as less optimal torque current, but no speed estimation error. For a periodic load torque, the inductance parameter error periodically fluctuates and, as a result, the position estimation error and speed error also periodically fluctuate. Periodic speed error makes speed regulation and load torque compensation especially difficult. This paper presents an inductance parameter estimator based on polynomial neural network (PNN) machine learning for PMSM sensorless drive with a period load torque compensator. By applying an inductance estimator, we also proposed a magnetic saturation compensation method to minimize periodic speed fluctuation. Simulation and experiments were conducted to validate the proposed method by confirming improved position and speed estimation accuracy and reduced system vibration against periodic load torque. Full article

(This article belongs to the Special Issue High Performance Power Converters: Design, Control, Devices and Applications)

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12 pages, 3364 KiB

Open AccessEditor’s ChoiceArticle

Cost-Effective High-Performance Digital Control Method in Series-Series Compensated Wireless Power Transfer System

by Hojoon Shin, Euihoon Chung and Jung-Ik Ha

Electronics 2020, 9(11), 1772; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics9111772 - 26 Oct 2020

Cited by 3 | Viewed by 2259

Abstract

This paper proposes a control method for a digital signal processor based series-series (SS) compensated wireless power transfer system. In the control method, load resistance and mutual inductance are identified simultaneously, and output voltage can be estimated by using only the primary side [...] Read more.

This paper proposes a control method for a digital signal processor based series-series (SS) compensated wireless power transfer system. In the control method, load resistance and mutual inductance are identified simultaneously, and output voltage can be estimated by using only the primary side voltage and current without direct feedback from the secondary side circuit. Since this estimation method requires a complex mathematical calculation procedure, a digital signal processor is used in this system. One of the major disadvantages of using a digital controller in this system is a limitation of sampling rates. Therefore, in this paper, several current reconstruction methods with limited sampling rates are investigated and applied. As a result, this controller not only reduces the cost of the system but also shows good estimation performance within the limited digital controller unit resource. The proposed control concept is verified by experimental results with a 48W laboratory prototype. Full article

(This article belongs to the Special Issue High Performance Power Converters: Design, Control, Devices and Applications)

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