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263 results on '"Costinett, Daniel"'

2. Fourier Analysis and Design of a Shielded 120 kW Inductive Wireless System

Author

Foote, Andrew, Costinett, Daniel, Kusch, Ruediger, Mohammad, Mostak, and Onar, Omer

Abstract

High-power inductive wireless power transfer (WPT) systems for electric vehicles are designed to meet specifications, such as stray field, power level, efficiency, misalignment tolerance, and ground clearance. These metrics are all heavily influenced by the coil geometry. This article proposes a coil design method based on the Fourier analysis method (FAM), which is an analytical method for directly designing coil geometries to meet stray field and power level requirements through an optimization of Fourier basis function coefficients. In this work, two 120 kW WPT proof-of-concept demonstrators with low stray field and high efficiency are built from FAM optimization results to validate the models and show the impact of the FAM design process. Experimental validation of the Generation 2 demonstrator at 120 kW output power resulted in a measured dc/dc efficiency of 97.2% at alignment with a 125 mm airgap. At the 120 kW test point, the stray fields 80 cm away from the center of the airgap between the coil assemblies were 3.4 μT(rms) on the X-axis and 3.5 μT(rms) on the Y-axis, much lower than the 27 μT(rms) ICNIRP limit.

Published
2024
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3. Full Integration of On-Board Charger, Auxiliary Power Module, and Wireless Charger for Electric Vehicles Using Multipurpose Magnetic Couplers

Author

Liang, Ziwei, Zhu, Liyan, Sun, Yue, Li, Jie, Qin, Ruiyang, Arka, Basu, Costinett, Daniel, and Bai, Hua

Abstract

To further improve the system integration and convenience of the battery charging system for electric vehicles, this letter proposed a multipurpose magnetic coupler-based charging solution that integrates bidirectional on-board charger (OBC), wireless power transfer (WPT), and an auxiliary power module (APM). The proposed solution presents multiple highlights: 1) the first exhibited solution to integrate OBC, WPT, and APM in one unit; 2) magnetic integration that uses a multiwinding WPT pad to eliminate the main transformer of OBC and APM; and 3) topological integration that saves multiple active and passive devices. This letter includes a description of the system topology, operation principles of individual charging modes, a novel magnetic coupler, and the design methodology. Finally, a prototype was constructed and different charging modes were tested to validate the proposed design.

Published
2024
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10. Design of Low Inductance Busbar for 500 kVA Three-Level ANPC Converter

Author

Gui, Handong, Zhang, Zheyu, Chen, Ruirui, Niu, Jiahao, Wang, Fred, Tolbert, Leon M, Costinett, Daniel J, Blalock, Benjamin J, and Choi, Benjamin B

Subjects
Aircraft Propulsion And Power
Abstract

The adoption of SiC devices in high power applications enables higher switching speed, which requires lower circuit parasitic inductance to reduce the voltage overshoot. This paper presents the design of a busbar for a 500 kVA three-level active natural clamped converter. The layout of the busbar is discussed in detail based on the analysis of the multiple commutation loops, magnetic cancelling effect, and DC-link capacitor placement. The loop inductance of the designed busbar is verified with simulation, impedance measurements and converter experiment. The results can match with each other and the inductances of small and large loop are 6.5 nH and 17.5 nH respectively, which is significantly lower than the busbars of NPC type converters in other references.

Published
2019

11. A Simple Control to Reduce the Voltage Stress of Non-Conducting Switches in Three-Level ANPC Converter

Author

Gui, Handong, Chen, Ruirui, Niu, Jiahao, Tolbert, Leon M, Wang, Fred, Costinett, Daniel J, Blalock, Benjamin J, and Choi, Benjamin B

Subjects
Electronics And Electrical Engineering
Abstract

With the development of wide band-gap (WBG) technology, the switching speed of power semiconductor devices is increased, which makes circuits more sensitive to parasitics. For three-level active neutral point clamped (3L-ANPC) converters, the over-voltage of non-conducting switches can be an issue. This paper analyzes the multiple commutation loops in 3L-ANPC converter and summarizes the impact factors of the over-voltage for the non-conducting switch. It is found that the nonlinearity of the output capacitance of the device can significantly influence the over-voltage. A simple control without introducing any additional hardware circuit is proposed to attenuate the impact of the nonlinearity. With the proposed control, the peak over-voltage of the non-conducting switch can be reduced significantly. Multi-pulse test is conducted for a 3L- ANPC converter built with silicon carbide (SiC) MOSFETs. The testing results show that the peak over-voltage decreases from 892 V to 624 V with the proposed control. More detailed analysis and experimental results will be provided in the final paper.

Published
2019

12. Modeling of Multi-Loops Related Device Turn-On Overvoltage in 3L-ANPC Converters

Author

Gui, Handong, Chen, Ruirui, Niu, Jiahao, Tolbert, Leon M, Wang, Fred, Costinett, Daniel J, Blalock, Benjamin J, and Choi, Benjamin B

Subjects
Electronics And Electrical Engineering
Abstract

The analytical model for the device drain-source turn-on overvoltage in three-level active neutral point clamped (3L-ANPC) converters is established in this paper. Considering the two commutation loops in the converter, the relationship between the overvoltage and the loop inductances is evaluated. The line switching frequency device usually exhibits higher overvoltage, while the high switching frequency device is not strongly influenced by the multiple loops. A 500 kVA 3L-ANPC converter using SiC MOSFETs is tested, and the model is verified with the experimental results.

Published
2019

21. Single-Phase GaN-Based T-Type Totem-Pole Rectifier With Full-Range ZVS Control and Reactive Power Regulation.

Author

Sun, Jingjing, Zhu, Liyan, Qin, Ruiyang, Costinett, Daniel J., and Tolbert, Leon M.

Abstract

This article proposes a high-efficiency single-phase GaN-based rectifier with reactive power transfer for use in front-end power supplies as an efficient alternative to centralized reactive power compensation. A full-range zero-voltage switching (ZVS) modulation for both unity power factor (PF) operation and nonunity PF operation is proposed for the GaN-based rectifier in critical conduction mode (CRM) operation. A frequency limitation method is also developed to limit the peak frequency during the ac current zero-crossing. Also, a GaN-based T-type totem-pole rectifier is proposed to overcome the control challenge in CRM during the ac voltage zero-crossing. Meanwhile, a digital-based control scheme is developed to implement ZVS operation and reactive power regulation. The proposed rectifier and ZVS control have the advantages of simple topology, high efficiency, straightforward control implementation, and capability of flexible reactive power regulation. A 1.6-kVA prototype of the GaN-based CRM T-type totem-pole rectifier is built and demonstrated with full-range ZVS operation, 98.9% full-load efficiency, and flexible reactive power regulation with smooth dynamic response. [ABSTRACT FROM AUTHOR]

Published
2023
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37. Development of High-Power High Switching Frequency Cryogenically Cooled Inverter for Aircraft Applications

Author

Gui, Handong, primary, Zhang, Zheyu, additional, Chen, Ruirui, additional, Ren, Ren, additional, Niu, Jiahao, additional, Li, Haiguo, additional, Dong, Zhou, additional, Timms, Craig, additional, Wang, Fei, additional, Tolbert, Leon M., additional, Blalock, Benjamin J., additional, Costinett, Daniel, additional, and Choi, Benjamin B., additional

Published
2020
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