Low-EMF Wireless Power Transfer Systems of Four-Winding Coils with Injected Reactance-Compensation Current as Active Shielding

Furukawa, K.; Kusaka, Keisuke; Itoh, Jun‐ichi

doi:10.1109/apec42165.2021.9487148

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…Regarding this category of screens, several studies have been conducted [68][69][70][71][72][73][74]. Table 1 compares the most recent work on this screen type for the WPT system.…”

Section: ) Loopmentioning

confidence: 99%

“…The proposed procedure is described and applied to shield the magnetic field beside an EV with SAE standard coils during wireless charging. The results show that the magnetic field in the most critical area is significantly reduced (i.e., approximately halved) with a minimal influence on the electrical performances (i.e., WPT efficiency decreases by less than one percentage point compared to the case without active shielding) K. Furukawa et al [72] This work proposes and analyzes low-radiation noise WPT systems with active shielding. The method involves compensating the current flowing on additional windings around the WPT coils with additional power supplies to cancel the magnetic field generated by the coils.…”

Section: Referencementioning

confidence: 99%

See 1 more Smart Citation

Recent Results in Shielding Technologies for Wireless Electric Vehicle Charging Systems

Quercio,

Lozito,

Corti

et al. 2024

IEEE Access

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Electromagnetic compatibility (EMC) is crucial when designing and operating wireless power transfer (WPT) systems for charging Electric Vehicles (EVs). WPT technology allows the transmission of electrical energy from a power source to a device without requiring physical contact. However, it can generate electromagnetic interference (EMI) that could disturb nearby electronic devices or harm people nearby. Shielding techniques are commonly employed to mitigate EMI in WPT systems. However, implementing effective shielding techniques can be complex, involving trade-offs between effectiveness, cost, and shielding weight. In this article, different types of existing shielding techniques for wireless charging systems of EVs are compared. The main concepts regarding the functioning of electromagnetic shields and the theory of the functioning of WPT systems have been also briefly introduced.

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“…Regarding this category of screens, several studies have been conducted [68][69][70][71][72][73][74]. Table 1 compares the most recent work on this screen type for the WPT system.…”

Section: ) Loopmentioning

confidence: 99%

Section: Referencementioning

confidence: 99%

Recent Results in Shielding Technologies for Wireless Electric Vehicle Charging Systems

Quercio,

Lozito,

Corti

et al. 2024

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Previous studies have proposed various methods by which to solve the leakage magnetic field problem and misalignment problem [10][11][12][13][14][15][16][17][18][19][20]. In the case of a leakage magnetic field problem, a passive shield method using a metal material and a shielding coil method were mainly used.…”

Section: Introductionmentioning

confidence: 99%

Shielding Sensor Coil to Reduce the Leakage Magnetic Field and Detect the Receiver Position in Wireless Power Transfer System for Electric Vehicle

et al. 2022

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This paper proposes a shielding sensor (SS) coil to solve the misalignment issue and the leakage magnetic field issue of the wireless power transfer (WPT) system for electric vehicles (EVs). The misalignment issue and leakage magnetic field issue must be solved because they can cause problems with power transfer efficiency reduction and electronic device malfunction. To solve these problems, the proposed SS coils are located over the Tx coil. The newly created mutual inductance between the Tx coil and the SS coil is used to detect the misalignment of the receiver in the Tx coil. In addition, the current phase of the SS coil is adjusted through impedance control of the SS coil to reduce the leakage magnetic field. The proposed SS coils were applied to the standard SAE J2954 model for the wireless charging of an EV. The WPT3/Z2 model of SAE J2954 with output power of 10 kW was simulated to compare the shielding effect according to the power transfer efficiency, and it was confirmed that a shielding effect of 76% was shown under the condition of a 3% reduction in the power transfer efficiency. In addition, the occurrence and direction of the misalignment between the receiver and the Tx coil were confirmed by using the tendency of mutual inductance between each SS coil and the Tx coil. In addition, as in the simulation result, the shielding effect and tendency were confirmed in an experiment conducted with the output power downscaled to 500 W.

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Analysis of Wireless Power Transfer System Employing Active Shielding with Virtual Inductance and Two-port Equivalent Circuit

Furukawa

Kusaka

Itoh

2021

2021 IEEE Energy Conversion Congress and Exposition (ECCE)

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Low-EMF Wireless Power Transfer Systems of Four-Winding Coils with Injected Reactance-Compensation Current as Active Shielding

Cited by 4 publications

References 16 publications

Recent Results in Shielding Technologies for Wireless Electric Vehicle Charging Systems

Recent Results in Shielding Technologies for Wireless Electric Vehicle Charging Systems

Shielding Sensor Coil to Reduce the Leakage Magnetic Field and Detect the Receiver Position in Wireless Power Transfer System for Electric Vehicle

Analysis of Wireless Power Transfer System Employing Active Shielding with Virtual Inductance and Two-port Equivalent Circuit

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