Methods for reducing leakage electric field of a wireless power transfer system for electric vehicles

Jo, Masaki; Sato, Yukiya; Kaneko, Yasuyoshi; Abe, Shigeru

doi:10.1109/ecce.2014.6953631

Cited by 22 publications

(6 citation statements)

References 5 publications

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“…Therefore, several reduction methods were presented, such as using ferrite materials [14], metallic materials (aluminum) [178,179], and metamaterials (MM) [180][181][182][183]. Changing the pulse width of the inverter to decrease the harmonics of the leakage electric field was presented [184]. In [185], the authors presented three active methods that include the independent self-EMF cancelation (ISEC), the 3-dB dominant EMF cancel method (3DEC), and the linkage-free EMF cancel method (LFEC).…”

Section: Emf and Emi Mitigation Methodsmentioning

confidence: 99%

Magnetically Coupled Resonance WPT: Review of Compensation Topologies, Resonator Structures with Misalignment, and EMI Diagnostics

2018

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Magnetically coupled resonance wireless power transfer systems (MCR WPT) have been developed in recent years. There are several key benefits of such systems, including dispensing with power cords, being able to charge multiple devices simultaneously, and having a wide power range. Hence, WPT systems have been used to supply the power for many applications, such as electric vehicles (EVs), implantable medical devices (IMDs), consumer electronics, etc. The literature has reported numerous topologies, many structures with misalignment effects, and various standards related to WPT systems; they are usually confusing and difficult to follow. To provide a clearer picture, this paper aims to provide comprehensive classifications for the recent contributions to the current state of MCR WPT. This paper sets a benchmark in order to provide a deep comparison between different WPT systems according to different criteria: (1) compensation topologies; (2) resonator structures with misalignment effects; and, (3) electromagnetic field (EMF) diagnostics and electromagnetic field interference (EMI), including the WPT-related standards and EMI and EMF reduction methods. Finally, WPT systems are arranged according to the application type. In addition, a WPT case study is proposed, an algorithm design is given, and experiments are conducted to validate the results obtained by simulations.

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Section: Emf and Emi Mitigation Methodsmentioning

confidence: 99%

Magnetically Coupled Resonance WPT: Review of Compensation Topologies, Resonator Structures with Misalignment, and EMI Diagnostics

2018

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“…At the same frequency, the authors of Laakso et al (2014) investigated 7-kW WPT adopting a computational modelling to the electromagnetic field to humans. Jo et al (2014) have been shown a variation of the pulse width to reduce harmonics and leakage. Furthermore, Choi et al (2014b) presented three methods such as independent self-cancellation, the 3-dB dominant cancel method and the linkage free cancel method.…”

Section: Safetymentioning

confidence: 99%

A Review of Methods and Challenges for Improvement in Efficiency and Distance for Wireless Power Transfer Applications

Kuka

Alkahtani

2020

Power Electronics and Drives

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Over the past few years, interest and research in wireless power transfer (WPT) have been rapidly incrementing, and as an effect, this is a remarkable technology in many electronic devices, electric vehicles and medical devices. However, most of the applications have been limited to very close distances because of efficiency concerns. Even though the inductive power transfer technique is becoming relatively mature, it has not shown near-field results more than a few metres away transmission. This review is focused on two fundamental aspects: the power efficiency and the transmission distance in WPT systems. Introducing the principles and the boundaries, scientific articles will be reviewed and discussed in terms of their methods and respective challenges. This paper also shows more important results in efficiency and distance obtained, clearly explaining the theory behind and obstacles to overcome. Furthermore, an overlook in other aspects and the latest research studies for this technology will be given. Moreover, new issues have been raised including safety and security.

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“…There was a concern that using the filter would lead to a systemwide decline in efficiency, but the filter served to reduce the harmonic component of the input power supply. As a result, power transfer using the fundamental wave was possible and the leakage electromagnetic field of harmonics could be reduced [20]. As significant levels of power transfer are anticipated in dynamic power transfer, it is critical that the leakage electromagnetic field be reduced.…”

Section: Input Impedancementioning

confidence: 99%

Circuit Analysis and Characterization of Contactless Power Transfer System with Variable Impedance

Yamada

Tsuda

Kobayashi

et al. 2018

Electrical Engineering Japan

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SUMMARY A contactless power transfer system using a repeater coil (repeater Coil topology) has been proposed as a method of suppressing overcurrent without power control during misalignment or no‐load. By installing a repeater coil between the primary and secondary coils, it is possible to increase the input impedance in the case of misalignment of the secondary coil or no‐load condition. In addition, another contactless power transfer system using primary parallel and secondary series resonance capacitors (PS capacitor topology) has been proposed. In the PS capacitor topology, the input impedance can be increased during misalignment of the secondary coil or no‐load condition similar to the repeater coil topology. In this paper, we evaluated the characteristics of both these topologies. First, we conducted a circuit analysis of the repeater coil topology and proposed a design method. In addition, we theoretically clarified the characteristic difference of the two topologies and experimentally evaluated the characteristics.

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Methods for reducing leakage electric field of a wireless power transfer system for electric vehicles

Cited by 22 publications

References 5 publications

Magnetically Coupled Resonance WPT: Review of Compensation Topologies, Resonator Structures with Misalignment, and EMI Diagnostics

Magnetically Coupled Resonance WPT: Review of Compensation Topologies, Resonator Structures with Misalignment, and EMI Diagnostics

A Review of Methods and Challenges for Improvement in Efficiency and Distance for Wireless Power Transfer Applications

Circuit Analysis and Characterization of Contactless Power Transfer System with Variable Impedance

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