Compact 7 kW inductive charging system with circular coil design

Schumann, Philipp; Diekhans, Tobias; Blum, Oliver; Brenner, U.; Henkel, Achim

doi:10.1109/edpc.2015.7323222

Cited by 9 publications

(8 citation statements)

References 9 publications

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“…The coupling coefficient k is calculated from M and the measured coil inductances L 1 , L 2 according to (12).…”

Section: Faraday's Law Methodsmentioning

confidence: 99%

“…The coupling coefficient k is then calculated according to (12). Obtaining the value of k according to this method requires preliminary measurement of R L , R p , R s , L p , L s , and C s .…”

Section: Methods Of Jiwariyavejmentioning

confidence: 99%

“…The primary and secondary capacitances were adjusted to keep the system tuned at resonance frequency f 0 = 100 kHz against variations in coil inductance; see the illustration in Figure 7b. The specific values of the circuit parameters measured for each displacement position were used to calculate M according to (23) and consequently k according to (12).…”

Section: Methods Of Jiwariyavejmentioning

confidence: 99%

“…Several standards were developed for stationary EV charging, e.g., SAE J2954 [10] or IEC 61980 [11]. The modern IPT systems for EV charging achieve similar levels of efficiency (>90%) and transferred power (tens and hundreds of kW) as the conductive chargers [2,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Novel Method of Coupling Coefficient Estimation Based on the Bifurcation Phenomena in Inductive Power Transfer

2021

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Inductive power transfer (IPT) applications, such as stationary charging of electric vehicles (EVs), at least moderate coupling between the coils to achieve high efficiency, but the coefficient k typically varies between of 0.1 to 0.4, depending on the displacement of the coils according to SAE J2954. Thus, accurate and reliable methods for estimation of k are required for positioning of the EV to achieve optimal alignment with the charging pad. Additionally, in IPT, numerous control strategies are available for regulating output power and optimizing system efficiency that require an accurate estimate of the mutual inductance or k. However, existing estimation methods tend to require detailed a-priori information of a large number of circuit parameters, or they need measurement of currents or voltages in both primary and secondary sides. This paper presents a preliminary evaluation of a novel, primary-side method to estimate k, which is based solely on the frequency response of the input phase while operating the system in bifurcation. The method does not require any additional measurements of the system parameters. The theoretical background of the method is presented together with the description of the measurement procedure. The method is experimentally verified and compared with two currently used estimation methods. According to the presented experimental evaluation, the proposed method estimates k with an error of 3.62% with respect to the reference over the evaluated range of 0.08 to 0.36. In addition, we demonstrate that the presented method is resilient to detuning.

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“…The coupling coefficient k is calculated from M and the measured coil inductances L 1 , L 2 according to (12).…”

Section: Faraday's Law Methodsmentioning

confidence: 99%

Section: Methods Of Jiwariyavejmentioning

confidence: 99%

Section: Methods Of Jiwariyavejmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel Method of Coupling Coefficient Estimation Based on the Bifurcation Phenomena in Inductive Power Transfer

2021

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“…A fully commercialized wireless chargers built by full SiC semiconductor based operation developed and achieved more than 92% efficiency [21]. In article [214], semi active bridge made-up off SiC MOSFET switches achieved 93.4% at power level of 7kW. In article [15], a wireless charger for 100kW system proposed.…”

Section: Figure 36 Operation Ranges Of Controllable Switchesmentioning

confidence: 99%

Inductive Wireless Power Transfer Charging for Electric Vehicles–A Review

Bharatiraja²,

2021

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Considering a future scenario in which a driverless Electric Vehicle (EV) needs an automatic charging system without human intervention. In this regard, there is a requirement for a fully automatable, fast, safe, cost-effective, and reliable charging infrastructure that provides a profitable business model and fast adoption in the electrified transportation systems. These qualities can be comprehended through wireless charging systems. Wireless Power Transfer (WPT) is a futuristic technology with the advantage of flexibility, convenience, safety, and the capability of becoming fully automated. In WPT methods resonant inductive wireless charging has to gain more attention compared to other wireless power transfer methods due to high efficiency and easy maintenance. This literature presents a review of the status of Resonant Inductive Wireless Power Transfer Charging technology also highlighting the present status and its future of the wireless EV market. First, the paper delivers a brief history throw lights on wireless charging methods, highlighting the pros and cons. Then, the paper aids a comparative review of different type's inductive pads, rails, and compensations technologies done so far. The static and dynamic charging techniques and their characteristics are also illustrated. The role and importance of power electronics and converter types used in various applications are discussed. The batteries and their management systems as well as various problems involved in WPT are also addressed. Different trades like cyber security economic effects, health and safety, foreign object detection, and the effect and impact on the distribution grid are explored. Prospects and challenges involved in wireless charging systems are also highlighting in this work. We believe that this work could help further the research and development of WPT systems..

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Technologieentwicklung

Bharoun¹

2020

Leichtbau Durch Funktionsintegration

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Compact 7 kW inductive charging system with circular coil design

Cited by 9 publications

References 9 publications

Novel Method of Coupling Coefficient Estimation Based on the Bifurcation Phenomena in Inductive Power Transfer

Novel Method of Coupling Coefficient Estimation Based on the Bifurcation Phenomena in Inductive Power Transfer

Inductive Wireless Power Transfer Charging for Electric Vehicles–A Review

Technologieentwicklung

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