The WPT dilemma — High K or high Q?

Miller, John M.; Schrafel, Peter; Long, Bruce R.; Daga, Andrew

doi:10.1109/wow.2016.7772079

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…However, the available design options are limited by both power and space requirements. After reduction of the potential losses, the efficiency of the power transfer can be improved by three design parameters, which ultimately affect the product kQ [79], [80]. As shown in (9), these parameters include the 2 mutual inductance M or coupling coefficient k, the self-inductance of the coils L and the frequency ω.…”

Section: Coil Designsmentioning

confidence: 99%

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A critical review on wireless charging for electric vehicles

Machura

2019

Renewable and Sustainable Energy Reviews

220

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Electric vehicles (EVs) have recently been significantly developed in terms of both performance and 10 drive range. There already are various models commercially available, and the number of EVs on road 11 increases rapidly. Although most existing EVs are charged by electric cables, companies like Tesla, 12 BMW and Nissan have started to develop wireless charged EVs that don't require bulky cables. 13 Rather than physical cable connection, the wireless (inductive) link effectively avoids sparking over 14 plugging/unplugging. Furthermore, wireless charging opens new possibilities for dynamic chargingcharging while driving. Once realised, EVs will no longer be limited by their electric drive range and the requirement for battery capacity will be greatly reduced. This has been prioritised and promoted worldwide, particularly in UK, Germany and Korea. This paper presents a thorough literature review on the wireless charging technology for EVs. The key technical components of wireless charging are summarised and compared, such as compensation topologies, coil design and communication. To enhance the charging power, an innovative approach towards the use of superconducting material in coil designs is investigated and their potential impact on wireless charging is discussed. In addition, health and safety concerns about wireless charging are addressed, as well as their relevant standards. Economically, the costs of a wide range of wireless charging systems has also been summarised and compared.

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Section: Coil Designsmentioning

confidence: 99%

“…The coupling can be maximised by using equally sized coils as shown in Figure 6. Having equally sized coils also reduces eddy currents induced in the vehicle chassis and leakage magnetic field surrounding the coils [80]. Reducing the size of the receiving coil is convenient, as it would be easier to incorporate in the vehicle.…”

Section: Coil Designsmentioning

confidence: 99%

A critical review on wireless charging for electric vehicles

Machura

2019

Renewable and Sustainable Energy Reviews

220

View full text Add to dashboard Cite

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“…The research of Miller et al [30] pointed out the way to improve efficiency and lower cost of IPT systems is to maximise the coupling coefficient of coils, rather than quality factor Q . As a result, the coupling coefficient of the LCT, denoted by k in this paper, is selected as the optimisation objective.…”

Section: Lct Designmentioning

confidence: 99%

Modified parameter tuning method for LCL/P compensation topology featured with load‐independent and LCT‐unconstrained output current

Yao

Liu

Wang

et al. 2018

IET Power Electronics

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Inductive power transfer (IPT) has attracted a lot of attention in recent 30 years due to its advantages of convenience, safety, reliability and weather proof. This study proposes a modified parameter tuning method for primary inductor-capacitorinductor, secondary parallel (LCL/P) compensation topology, which provides the characteristic of excellent constant current output (CCO). This characteristic is analysed on the basis of inductor-capacitor(LC) and capacitor-inductor (CL) resonant tanks. To lower the voltage stresses over capacitors and current stresses through inductors, the stress-based optimisation is conducted. The sensitivity of CCO characteristic with respect to the normalised deviation of compensation parameters is analysed; therefore, the performance of LCL/P compensated IPT system in practical scenarios can be fully understood. The loosely coupled transformer (LCT) is specially designed since it has a significant impact on system efficiency, component stress, power density etc. An exhaustive search algorithm is employed to find the optimal dimensions of the LCT. A 100 W LCL/P compensated IPT prototype is fabricated. The measured end-to-end efficiency, from DC input to DC output, is as high as 92.8%. The output current only increases by 2.02% when the load decreases by half. All experiment results agree well with the theoretical analysis.

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“…The use of equal and same size coils in an EV application Eddy currents to the vehicle chassis are decreased, as is magnetic field permeability surrounding the coil field. 167 When there is a coil of receiver volume size is reduced, it is more suited and easy to install in the car. When cars are fitted with a secondary side circuit, there is a greater benefit in terms of size and weight reduction.…”

Section: Coil Designmentioning

confidence: 99%

A critical review on inductive wireless power transfer charging system in electric vehicle

Geetha

Usha

2022

Energy Storage

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Considering a prospect where a driverless electric vehicle (EV) requires an automatic charging system that does not need a person to do anything. In this case, there is a need for a fully automated, fast, safe, cost‐effective, and reliable charging infrastructure that can be used for EVs and other EVs. This infrastructure must also be profitable and allow for quick adoption in electric transportation systems. Wireless charging methods may allow you to understand these characteristics. Wireless power transfer (WPT) is a future technology that offers flexibility, convenience, safety, and the capacity to be automated. Due to its high efficiency and ease of maintenance, resonant inductive wireless charging should get more attention in WPT techniques than other WPT methods. This literature provides an overview of the status of Resonant Inductive Wireless Power Transfer Charging technology, as well as a look at the current and prospects of the wireless EV industry. First, the article provides a brief history of wireless charging technologies, outlining the benefits and drawbacks. Then, the research assists in a comparative analysis of various types of WPT methodologies, control strategies, and compensation networks that have been done so far. The static and dynamic charging procedures, as well as their features, are shown. To increase charging power, a novel approach to the usage of superconducting materials in coil designs is examined, and their potential influence on wireless charging is highlighted. The detailed role and importance of power electronics, as well as the many types of converters utilized in diverse applications, are highlighted. The batteries and their management systems, as well as numerous WPT difficulties, are also discussed. Different trades are investigated, including cyber security economic consequences, health and safety, foreign object identification, and the effect and influence on the distribution grid. This article also highlights the opportunities and challenges associated with wireless charging systems. We anticipate that our effort will contribute to the advancement of WPT system research and development.

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The WPT dilemma — High K or high Q?

Cited by 10 publications

References 8 publications

A critical review on wireless charging for electric vehicles

A critical review on wireless charging for electric vehicles

Modified parameter tuning method for LCL/P compensation topology featured with load‐independent and LCT‐unconstrained output current

A critical review on inductive wireless power transfer charging system in electric vehicle

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