Robust 3-D Wireless Power Transfer System Based on Rotating Fields for Multi-User Charging

Wang, Nelson Xuntuo; Wang, Hanwei; Mei, Jie; Mohammadi, Sajjad; Moon, Jinyeong; Lang, Jeffrey H.; Kirtley, James L.

doi:10.1109/tec.2020.3034794

Cited by 14 publications

(5 citation statements)

References 38 publications

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“…The misalignment in any intermediate coil may result in a quick drop of the coupling strength at that power link, which leads to unexpected power loss and even a fault of the whole system. Recently, a specially designed coil structure has been proposed for omnidirectional WPT systems [21]. This structure is designed with two [22] or three orthogonal coils [23], which are decoupled from each other to form different power transmission paths.…”

Section: Iintroductionmentioning

confidence: 99%

Omnidirectional Magnetic Resonant Extender Design for Underwater Wireless Charging System

Tian,

Liu,

Chau

et al. 2024

IEEE J. Emerg. Sel. Topics Power Electron.

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Long-range underwater wireless power transfer (WPT) systems have great application prospects in many industrial fields. However, conventional WPT systems may suffer different kinds of technical issues in this highly unstable operation environment, such as large output decay when the transmission distance increases, and output fluctuation caused by instability of the water flows. To solve these problems, this paper proposes a novel solution to achieve an enlarged resonance range, higher efficiency, and more stable output. The LCC-S-S compensation circuit is adopted in the system with a highly stable primary current, which improves its fault tolerance ability to adapt to the unstable underwater environment. A portable omnidirectional magnetic resonant extender is designed as an intermediate device to extend the underwater transmission distance and raise the system efficiency. The specially designed structure enables it with two separate but complementary three-coil WPT systems which solves the conventional angular dead zones issue. Theoretical analysis proves that under the idealized conditions, both the magnitude and phase of the load current can be effectively maintained as absolute constant, with arbitrary water flow direction or velocity. Both circuit simulation and finite element analysis (FEA) results are presented to validate that the system is possessed with high fault tolerance. For further assessment, an experimental prototype is established, and the practical test results confirm that the system can maintain a relatively high transmission efficiency under large lateral and angular misalignments ranging from -90° to +90°.

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Section: Iintroductionmentioning

confidence: 99%

Omnidirectional Magnetic Resonant Extender Design for Underwater Wireless Charging System

Tian,

Liu,

Chau

et al. 2024

IEEE J. Emerg. Sel. Topics Power Electron.

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“…RF rectifying circuits are crucial in the microwave field to convert microwave energy into DC energy [1]. They have been widely used in wireless charging, radio frequency identification (RFID) systems, and energy harvesting systems [2][3][4]. However, one of the paramount problems with the present rectifiers [5][6][7][8] is that they usually suffer from poor conversion efficiency at low-resistance loads.…”

Section: Introductionmentioning

confidence: 99%

A Method for Improving Radio Frequency Rectification Efficiency in Low-Resistance Loads

Jiang,

Liu,

Yang

et al. 2024

Electronics

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Present radio frequency (RF) rectifiers usually suffer from poor power conversion efficiency (PCE) at low-resistance loads, and the currently proposed DC-DC converter cannot solve this problem well. Aiming at this above problem, we propose a novel DC-DC converter for rectifiers, which consists of a Boost–Buck circuit and a Buck circuit cascaded together to maintain high PCE at both high and low load resistance; the converter can also operate over a wide range of input powers. The proposed converter, along with a 2.45 GHz rectifier, was fabricated to verify its performance. With the converter, the load range of the rectifier when the overall PCE is over 50% was extended from 250 Ω–1250 Ω to 5 Ω–3000 Ω. The highest overall PCE reached up to 61% and the overall PCE at a small load of 5 Ω increased from 1.1% to 54%. The proposed converter can be used in wireless power transmission (WPT).

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“…The full-bridge and half-bridge converters are commonly used for high power applications like electric vehicle charging [26] or high voltage applications like plasma treatment in the medical field [2]. The advantages of power amplifier-based topology include the increase in transfer distance [27][28][29]. The resonant topologies consist of pulse width modulation (PWM) converters.…”

Section: Introduction Of Power Topologies For Cptmentioning

confidence: 99%

A Case Study: Influence of Circuit Impedance on the Performance of Class-E2 Resonant Power Converter for Capacitive Wireless Power Transfer

Bezawada

Zhang

2021

Electronics

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The evolution of power electronics led to rapid development in wireless charging technology; as a result, a single active switch topology was introduced. The present market utilizes inductive wireless power transfer (IPT); because of the disadvantages of cost, size, and safety concerns, research on wireless power transfer was diverted towards capacitive wireless power transfer (CPT). This paper studies the optimal impedance tracking of the capacitive wireless power transfer system for maximum power transfer. Compared to prior methods developed for maximum power point tracking in power control, this paper proposes a new approach by means of finding impedance characteristics of the CPT system for a certain range of frequencies. Considering the drone battery as an application, a single active switch Class-E2 resonant converter with circular coupling plates is utilized. Impedance characteristics are identified with the help of equations related to the input and resonant impedance. The impedance tracking is laid out for various resonant inductors, and the difference in current peak is observed for each case. Simulations verify and provide additional information on the reactive type. Additionally, hardware tests provide the variation of input current and output voltage for a range of frequencies from 70 kHz to 300 kHz. Efficiency at the optimal impedance points for a resonant inductor with 50 μH and 100 μH are tested and analyzed. It is noted that the efficiency for a resonant inductor with 50 μH is 8% higher compared to the CPT with a 100 μH resonant inductor. Further hardware tests were performed to investigate the impact of frequency and duty cycle variation. Zero-voltage-switching (ZVS) limits have been discussed with respect to both frequency and duty cycle.

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Robust 3-D Wireless Power Transfer System Based on Rotating Fields for Multi-User Charging

Cited by 14 publications

References 38 publications

Omnidirectional Magnetic Resonant Extender Design for Underwater Wireless Charging System

Omnidirectional Magnetic Resonant Extender Design for Underwater Wireless Charging System

A Method for Improving Radio Frequency Rectification Efficiency in Low-Resistance Loads

A Case Study: Influence of Circuit Impedance on the Performance of Class-E2 Resonant Power Converter for Capacitive Wireless Power Transfer

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