A Resonant Reactive Shielding for Planar Wireless Power Transfer System in Smartphone Application

Park, Jaehyoung; Kim, Dong-Wook; Hwang, Karam; Park, Hyun Ho; Kwak, Se Hyun; Kwon, Jong Hwa; Ahn, Seungyoung

doi:10.1109/temc.2016.2636863

Cited by 155 publications

(62 citation statements)

References 17 publications

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“…In order to reduce EMF, many studies have been conducted on different circuit topologies, modulation methods and configurations of IPT coils (5)- (16) . In particular, non-resonant reactive shield and active shield, which are focused on the configurations of the IPT coils, have been proposed (11)- (14) .…”

Section: Introductionmentioning

confidence: 99%

“…Non-resonant reactive shielding methods require additional short-circuited coils to reduce EMF (11) (12) . The magnetic flux induces a current which cancels the leakage magnetic field in the short-circuited coils when a leakage magnetic flux crosses the short-circuited coils.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic flux induces a current which cancels the leakage magnetic field in the short-circuited coils when a leakage magnetic flux crosses the short-circuited coils. However, the EMF-reduction effectiveness is low at the place far from the canceling windings because the magnetomotive force of the canceling winding is limited by the interlinkage magnetic flux (11) .…”

Section: Introductionmentioning

confidence: 99%

“…E-mail: itoh@vos.nagaokaut. ac.jp * Nagaoka University of Technology 1603-1, Kamitomioka-machi, Nagaoka, Niigata 940-2188, Japan canceling windings which are connected to the main windings or additional power sources (11)- (14) . In this method, the current flowing in the canceling windings is controllable with the main windings or the power sources.…”

Section: Introductionmentioning

confidence: 99%

“…In this method, the current flowing in the canceling windings is controllable with the main windings or the power sources. Therefore, the cancellation of the magnetic field becomes more effective compared to the non-resonant reactive shielding method because the magnetic field generated by the canceling windings are controllable (11) . The reduction effect of EMF by adding coils has been reported in several papers (11)- (16) .…”

Section: Introductionmentioning

confidence: 99%

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General Analytical Model of Inductance Variation by EMF-canceling Coil for Inductive Power Transfer System

2019

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This paper presents an analytical model and a design criteria for additional windings to reduce electromagnetic field (EMF) generated from inductive power transfer (IPT) systems. In particular, the canceling windings are connected to the main windings with common-mode connection, differential-mode connection, or short-circuited connection. Parameter variation, which may degrade the system efficiency, occurs in the IPT system owing to the unwanted coupling between the main windings and the canceling windings. Therefore, the theoretical analysis of the IPT system considering the canceling windings is conducted to evaluate the effects of the EMF shielding methods on system parameter variation. The calculation results of the system parameters agree with the measurement results in the prototype of the four-winding IPT coils, the error is lower than 5%. The simulation results with a 1-kW prototype IPT system indicate that the magnetic flux density at the distance of 50 cm from the bottom of the receiving coils decreases by at most 41% with the differential-mode connection. Japan as an associate professor. Since 2017, he has been a professor. His research interests are matrix converters, dc/dc converters, power factor correction techniques, energy storage system and adjustable speed drive systems. He received IEEJ

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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General Analytical Model of Inductance Variation by EMF-canceling Coil for Inductive Power Transfer System

2019

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Analysis and design of a three‐coil IPT system with independent dual output ports

Zhou,

Dong,

Wang

et al. 2024

Circuit Theory & Apps

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Industrial applications tend to involve a substantial assemblage of electronic devices, and it is imperative to consider diverse charging requirements while charging these devices. This paper proposes a three‐coil single‐input‐and‐dual‐output (SIDO) inductive power transfer (IPT) system to meet the charging requirements of different devices. The system includes two independent output ports, providing constant voltage (CV) output and constant current (CC) output for different loads, respectively. In addition, the zero‐phase angle (ZPA) operation can be achieved, thus avoiding injection of reactive power and improving energy transfer efficiency. Unlike previous related studies, the receiver of the proposed SIDO IPT system only includes one receiving coil to pick up energy, eliminating unnecessary cross‐coupling and complex decoupling circuits in traditional IPT systems with multiple outputs. This study first analyzes the CC/CV output theory of the proposed SIDO IPT system in detail, and designs and optimizes the parameters by establishing an equivalent model. Then, the conditions for achieving zero‐voltage switching (ZVS) operation of the inverter are obtained by analyzing the sensitivity of CC/CV performance to the variation of the compensation capacitors. Finally, a verification experimental prototype with 2.5A CC output and 72 V CV output is established to verify the effectiveness of the proposed IPT system.

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A Fractional‐Order Method of Frequency Splitting and Bifurcation Suppression for Wireless Power Transfer Systems

Shu,

Zhang,

Jiang

et al. 2024

Circuit Theory & Apps

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Wireless power transfer (WPT) is an emerging technology that enables the wireless transfer of electrical energy from power supplies to electrical equipment. It has been widely used in electric vehicles, mobile phones, household appliances, medical devices, and other fields. However, the frequency splitting and bifurcation phenomena existing in WPT systems are the fundamental obstacles and challenges that affect the effective operation of WPT systems. In this paper, a method based on the fractional‐order circuit is proposed to simultaneously suppress the frequency splitting and bifurcation phenomena by changing the order of fractional‐order capacitor. By replacing the compensation capacitor in the transmitter of the traditional WPT system with a fractional‐order capacitor, a fractional‐order WPT system is formed. Then, using fractional calculus and circuit theory, the mathematical model of the proposed WPT system containing a fractional‐order capacitor is established, and the frequency splitting and bifurcation phenomena are analyzed. The theoretical results show that the frequency splitting and bifurcation phenomena are suppressed only by adjusting the order of fractional‐order capacitor, and the output power of the original resonant frequency is improved. Finally, the experimental prototype is implemented to validate the theoretical results.

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A Resonant Reactive Shielding for Planar Wireless Power Transfer System in Smartphone Application

Cited by 155 publications

References 17 publications

General Analytical Model of Inductance Variation by EMF-canceling Coil for Inductive Power Transfer System

General Analytical Model of Inductance Variation by EMF-canceling Coil for Inductive Power Transfer System

Analysis and design of a three‐coil IPT system with independent dual output ports

A Fractional‐Order Method of Frequency Splitting and Bifurcation Suppression for Wireless Power Transfer Systems

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