{"title":"Phase Shift Control of a Three-Phase Inverter for Balanced Secondary Currents in Misaligned Three-Phase Inductive Power Transfer Systems","authors":"J. Pries, G. Su, V. Galigekere, O. Onar","doi":"10.1109/WoW47795.2020.9291271","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291271","url":null,"abstract":"This paper presents a strategy for generating fundamental reference voltage commands for a double-sided LCC tuned three-phase wireless power transfer (WPT) system to achieve balanced output currents when the receiver and transmitter are not perfectly aligned. Formulas for translating the normalized fundamental current commands into phase-shift commands for two of the phase legs in a two-level three-phase inverter are derived. The methodology is validated through circuit simulations performed using coupler models derived from finite-element simulations. Simulation results for a 1.5 k W system design are included, which indicate near perfect correction of imbalance in the secondary currents for a typical misalignment case.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121855644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"WoW Author Index","authors":"","doi":"10.1109/wow47795.2020.9291323","DOIUrl":"https://doi.org/10.1109/wow47795.2020.9291323","url":null,"abstract":"","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123735429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Lan, Tomamaso Polonelli, Yuan Qin, Nunzio Pucci, C. Kwan, J. Arteaga, D. Boyle, D. Yates, E. Yeatman, P. Mitcheson
{"title":"An Induction-Based Localisation Technique for Wirelessly Charged Drones","authors":"L. Lan, Tomamaso Polonelli, Yuan Qin, Nunzio Pucci, C. Kwan, J. Arteaga, D. Boyle, D. Yates, E. Yeatman, P. Mitcheson","doi":"10.1109/WoW47795.2020.9291257","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291257","url":null,"abstract":"This manuscript proposes a technique to use an inductive power transfer system to perform last-stage localisation of drones for tracking and automated landing. This system is proposed to assist the final stage of landing by solely making use of the inductive charger and avoid using vision or other external sensors which would increase cost and complexity.The simplicity of the proposed method can help widen the practical implementation of automated drones. This proposed method is demonstrated with a high frequency (6.78 MHz) inductive charging system that can deliver up to 100 W of power to a DJI M100 drone when it lands at any position on the designed one-meter diameter charging pad.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115172059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design of High-Q Metasurfaces Using a Trapped Mode for High-Efficient Energy Harvesting","authors":"Thi Hai-Yen Nguyen, G. Byun","doi":"10.1109/WoW47795.2020.9291260","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291260","url":null,"abstract":"This paper proposes the design of a high-Q metasurface using a trapped mode to enhance the RF energy harvesting efficiency. The unit cell of the proposed design consists of two rectangular loops separated into four strips. The trapped mode is excited by breaking the symmetricity of the two loops, which enables a sharp resonance with a higher quality factor and strong electromagnetic fields around the metallic patterns. The feasibility of the proposed approach is verified by observing improvement of current and near-field distributions, multipole moments, and time-domain responses. A bias circuit is also designed to switch between ON and OFF states to electrically change symmetricity of the geometry. The results prove that the efficiency of RF energy harvesting can be improved by the proposed metasurface with the trapped mode.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128887184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Francesca Grazian, Wenli Shi, T. Soeiro, Jianning Dong, P. V. van Duijsen, P. Bauer
{"title":"Quality Factor Based Design Guideline for Optimized Inductive Power Transfer","authors":"Francesca Grazian, Wenli Shi, T. Soeiro, Jianning Dong, P. V. van Duijsen, P. Bauer","doi":"10.1109/WoW47795.2020.9291261","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291261","url":null,"abstract":"In high-power wireless battery charging that uses inductive power transfer, a considerable amount of power losses are located in the transmitter and receiver coils because they carry high resonant currents and typically have a loose coupling between them which increases eddy current losses. Therefore, the nominal operation needs to be chosen such that the coils' losses are minimized. Additionally, the inverter's semiconductors soft-switching improves both the power conversion efficiency and the electromagnetic compatibility of the system, thus it needs to be safeguarded for a wide operating range. However, depending on the chosen quality factor of the coils, it might happen that the minimum coils' losses and soft-switching are not satisfied at the same time. This paper defines a guideline on the parametric selection of the coils' quality factor such that the optimum operation of both the coils and the resonant converter can be achieved simultaneously. This parametric guideline is proposed for resonant converters implementing the four basic compensation networks: series-series, series-parallel, parallel-series, and parallel-parallel. Finally, circuit examples are provided for an 11 kW wireless battery charging system.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122537037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Switched Mode Power Supply with High Isolation for High Voltage Applications","authors":"Hokyeong Kim, Younghoon Cho","doi":"10.1109/WoW47795.2020.9291297","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291297","url":null,"abstract":"This paper introduces a switched mode power supply (SMPS) for power systems that requiring high voltage isolation. The SMPS in this paper consists of a diode full wave rectifier and a full-bridge LLC resonant converter. Isolation of input and output is achieved in the LLC resonant converter's transformer. Dielectric strength is generally determined by the length of creepage path and clearance like insertion the air gap and the insulator. In this paper, the proposed converter operates about 140-kHz switching frequency, maximum power rating of 500-W, maximum output current of 21-A, and output voltage of 24-V. The proposed converter was verified by simulation.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128135863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eun S. Lee, Myung-Yong Kim, S. Lee, Byung-Song Lee
{"title":"A High-efficient Duty-controlled Synchronous Rectifier for Uniformly Powering of Multiple Receivers","authors":"Eun S. Lee, Myung-Yong Kim, S. Lee, Byung-Song Lee","doi":"10.1109/WoW47795.2020.9291292","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291292","url":null,"abstract":"A high-efficient synchronous rectifier in the receivers, which controls the duty cycle of the rectifier to modulate the load voltage, is proposed in this paper. The proposed rectifier can be utilized to reduce the conduction loss of the switching devices, and to control the load voltage with a simple control circuit. Thus, the load voltage of multiple rectifiers, which are connected in parallel each other, can be regulated for uniformly powering of the receivers under multiple wireless charging condition. In this paper, the new control method of two AC/DC rectifiers installed in the railway vehicle was introduced and verified by simulation. As a result, the uniformly powering of the two rectifier was achieved for 500kW load power delivery by the proposed rectifier with 97.0% of power efficiency, although each receiver has different magnetic field in the railroad track.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130901848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparison of Circular and Double-D Coil Topologies for Automotive Inductive Charging Systems","authors":"Timo Lämmle, N. Parspour, Jan Hölz","doi":"10.1109/WoW47795.2020.9291331","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291331","url":null,"abstract":"In current proposals of SAE J2954, ISO 19363 and IEC 61980 for the standardization of automotive WPT systems, the circular and Double-D coil topologies are introduced. Only reference designs and coupling factor values are specified for both variants in the standardization documents. To compare and evaluate the topologies in terms of interoperability, this paper analyzes the coupling factor tolerance of the coil systems in the case of misalignment and defines a new parameter to compare the systems. In a second step, the quality factors of the coils are determined by measurements to calculate the achievable efficiency as further comparative value. These investigations are conducted for the two systems with identical coil topologies on both sides as well as for the two cross-systems with mixed coil topologies. Based on the knowledge obtained from these investigations a comparison of these four systems for application in automotive WPT systems can be made.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129330071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design Considerations for High-power-density IPT Pads using Nanocrystalline Ribbon Cores","authors":"Daniel E. Gaona, T. Long","doi":"10.1109/WoW47795.2020.9291288","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291288","url":null,"abstract":"In inductive power transfer, ferrite cores present several drawbacks such as brittleness, low permeability and saturation point, and sensitivity to temperature variation. Other materials such as nanocrystalline alloys are being considered as substitutes. They offer a higher permeability and saturation point. Also, they are more robust and stable with temperature. This paper reviews the design considerations that should be taken into account when designing nanocrystalline cores for IPT applications. Bespoke designs are required to mitigate the eddy-current losses which arise due to the high conductivity of the material. A WPT3 pad, 11 kW, is designed and compared to and identical pad with ferrite cores. Using nanocrystalline ribbon cores, a higher coupling factor, 11%, was achieved. Also, a 2% improvement in efficiency was measured. This is attributed to the lower hysteresis losses and higher coupling factor. Finally, the saturation limits were tested for both materials. Results confirm that, with nanocrystalline ribbon cores, higher power ratings and power densities can be achieved.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132449932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Novel Coil for Wireless Power Transfer System","authors":"Yun Zhang, Lifang Wang, Yanjie Guo","doi":"10.1109/WoW47795.2020.9291335","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291335","url":null,"abstract":"Wireless power transfer (WPT) technology is now widely used because it's safe, convenient and efficient. The performance of the WPT system is largely determined by the coupling between the transmitter coil and the receiver coil. This paper proposed a novel coil that concludes a main coil and two auxiliary coils and the three coils are electrically connected in series with one another. The design parameters of the proposed coil and its effects are analyzed. Results show that, with properly chosen design parameters, the proposed coil could not only reduce the electromagnetic field (EMF) formed in a location away from the coils but also prevent or minimize a reduction in power transmission efficiency.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122220566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}