Publications

This article investigates a novel magnetic power distribution (MPD) system that utilizes conductive magnetic power transfer and wireless power transfer methods. The proposed system employs U- and I-type magnetic cores to form a single-input and multiple-output system, where the U-type magnetic core serves as the transmitter or receiver, and the I-type magnetic core acts as the flux conduction path. By inserting low relative permeability (LRP) I cores between two high relative permeability (HRP) I cores and placing additional U magnetic cores in parallel with the LRP I cores, multiple outputs with different power ratings can therefore be realized. Analysis of operating frequency and the effect of LRP I core on power distribution is presented in detail through theory and simulation. Finally, a prototype with a wide range output power of 200W-550W is tested to evaluate the performance of the proposed MPD system with one- and two-receiver modes, in which the system with a single receiver achieves 329W with a system efficiency of 82.77%, while the system with two receivers obtained a total output power of 422.73W with 86.98% system efficiency.

In this article, a current-source converter based on resonant switched-inductor (SI) unit is presented. By integrating multiple resonant SI units, the proposed SI power converter (SIPC) can realize multiple current conversion ratios. Therefore, the proposed converter is suitable for current conversion applications, especially in high-current and low-voltage applications such as the wireless charging of automated guided vehicles (AGVs). By forming a resonant SI unit, the proposed SIPC can operate with zero-voltage switching (ZVS) over the full range of load, which is beneficial for increasing switching frequency, leading to a more compact topology. The theoretical analysis, high conversion ratio SIPC extension, and design considerations are given in detail. Finally, the feasibility of the proposed SIPC including two- and three-times topologies are experimentally tested over a wide range of output power from 80 to 580 W, where two-times topology achieves a maximum efficiency of 95.72% and three-times topology obtains a maximum efficiency 92.91%.

A magnetohydrodynamic (MHD) engine is a propulsion system that converts electric energy into fluid flow by utilizing the Lorentz force. It has the potential to electrify the conventional rotational propellers on ships, which can have adverse effects on the underwater environment. However, the development of an MHD engine for maritime propulsion is sparse, from the motion theory to the prototype investigation. In this article, the advantage of high-frequency ac operation is depicted. The systematic introduction for the ac MHD engine is elucidated for the electromagnetic field generator configurations, engine drive topologies, and onboard compartment distributions. The propulsion mechanism will be interpreted in force analysis, regarding the Lorentz force and its interaction with the fluid by applying the Stokes law, by deriving the forces to a single ion to the liquid dragged by the engine. Moreover, it provides a case study of the practical development for the engine, showing the power circuit with the forward/reverse control, the analysis of the reluctance circuit and magnetic simulation for the magnetic field estimation, and the laboratory testing solution for mock seawater. A 250-W experiment combining the electric and fluid measurements was conducted to benchmark the ac operational MHD engine structure, validating the proposed topology with practical control and presenting 80% accuracy of the propulsion mechanism analysis.

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Turpis senectus amet tortor in sodates odio tettus. Pretium id amet, euismod sceteriscue vetit. Imperdiet senectus ornare augue donec cuis. Uttrices ut nist egestas eros, nam sceteriscue. Uttricies tacus, nutta cras eget dotor ptacerat. Et in nutta fetis pettentescue augue. Porttitor hendrerit congue morbi proin aticuam.

Turpis senectus amet tortor in sodates odio tettus. Pretium id amet, euismod sceteriscue vetit. Imperdiet senectus ornare augue donec cuis. Uttrices ut nist egestas eros, nam sceteriscue. Uttricies tacus, nutta cras eget dotor ptacerat. Et in nutta fetis pettentescue augue. Porttitor hendrerit congue morbi proin aticuam.

Turpis senectus amet tortor in sodates odio tettus. Pretium id amet, euismod sceteriscue vetit. Imperdiet senectus ornare augue donec cuis. Uttrices ut nist egestas eros, nam sceteriscue. Uttricies tacus, nutta cras eget dotor ptacerat. Et in nutta fetis pettentescue augue. Porttitor hendrerit congue morbi proin aticuam.

Turpis senectus amet tortor in sodates odio tettus. Pretium id amet, euismod sceteriscue vetit. Imperdiet senectus ornare augue donec cuis. Uttrices ut nist egestas eros, nam sceteriscue. Uttricies tacus, nutta cras eget dotor ptacerat. Et in nutta fetis pettentescue augue. Porttitor hendrerit congue morbi proin aticuam.