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2015 IEEE Wireless Power Transfer Conference (WPTC)最新文献

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Harmonic spaced multisines for efficient wireless power transmission 用于高效无线电力传输的谐波间隔多重线
2015 IEEE Wireless Power Transfer Conference (WPTC) Pub Date : 2015-05-13 DOI: 10.1109/WPT.2015.7140130
D. Belo, N. Borges Carvalho
{"title":"Harmonic spaced multisines for efficient wireless power transmission","authors":"D. Belo, N. Borges Carvalho","doi":"10.1109/WPT.2015.7140130","DOIUrl":"https://doi.org/10.1109/WPT.2015.7140130","url":null,"abstract":"In recent years, multisine signals have been used to increase RF-to-DC conversion efficiency in wireless power transmission systems. These signals are characterized to have a high PAPR that allows to excite rectifier diodes more efficiently in low power environments, extending the reading range of a RFID tag with same average radiated power, for example. With this paper we propose a new kind of multisines, a harmonic spaced multisine that achieves unique and interesting time domain properties. Both analytic and experimental results are performed to show the superiority of this signal.","PeriodicalId":194427,"journal":{"name":"2015 IEEE Wireless Power Transfer Conference (WPTC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131841481","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}
引用次数: 6
Study on matching condition of an infinite dipole array antenna with reflector for non-leak MPT system 无泄漏MPT系统中无限偶极子阵列天线与反射器的匹配条件研究
2015 IEEE Wireless Power Transfer Conference (WPTC) Pub Date : 2015-05-13 DOI: 10.1109/WPT.2015.7140133
Y. Tsukamoto, T. Matsumuro, H. Tonomura, Y. Ishikawa, N. Shinohara
{"title":"Study on matching condition of an infinite dipole array antenna with reflector for non-leak MPT system","authors":"Y. Tsukamoto, T. Matsumuro, H. Tonomura, Y. Ishikawa, N. Shinohara","doi":"10.1109/WPT.2015.7140133","DOIUrl":"https://doi.org/10.1109/WPT.2015.7140133","url":null,"abstract":"Non-leak energy technology is essential for high power system in microwave power transmission (MPT). MPT mainly consists of a transmitting antenna and a receiving antenna, and we focus on the receiving antenna. Non-leak energy system requires the receiving antenna to receive all the energy which reaches the antenna surface. It is known that the receiving efficiency of an infinite dipole array antenna with reflector becomes 100% analytically under the matching condition by the induced electromotive force (EMF) method. In this paper, the matching condition is discussed by using finite difference time domain (FDTD) method simulation. The radiation impedance is analyzed to satisfy the matching condition. In case that the load impedance is complex conjugate of the radiation impedance, the receiving efficiency reaches 99.9%. In addition, the reflection of the transient state is discussed.","PeriodicalId":194427,"journal":{"name":"2015 IEEE Wireless Power Transfer Conference (WPTC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127069568","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}
引用次数: 1
A real-time electrically controlled active matching circuit utilizing genetic algorithms for biomedical WPT applications 基于遗传算法的生物医学WPT实时电控有源匹配电路
2015 IEEE Wireless Power Transfer Conference (WPTC) Pub Date : 2015-05-13 DOI: 10.1109/WPT.2015.7140168
J. Bito, Soyeon Jeong, M. Tentzeris
{"title":"A real-time electrically controlled active matching circuit utilizing genetic algorithms for biomedical WPT applications","authors":"J. Bito, Soyeon Jeong, M. Tentzeris","doi":"10.1109/WPT.2015.7140168","DOIUrl":"https://doi.org/10.1109/WPT.2015.7140168","url":null,"abstract":"In this research, the feasibility of a real-time active matching circuit for biomedical WPT applications is discussed. Also, the genetic-algorithm based matching circuit design method utilizing discrete circuit components is introduced and the practicality of active matching circuits for WPT is verified with preliminary measurement results featuring a maximum of 3 dB of improvement in transmission coefficient for a range of spanning a coil to coil distance of 10 to 12 cm, which was achieved by inserting the active matching circuit.","PeriodicalId":194427,"journal":{"name":"2015 IEEE Wireless Power Transfer Conference (WPTC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134618770","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}
引用次数: 6
Analysis of WPT system using rearranged indirect-fed method for mobile applications 移动应用中WPT系统的重排间接馈入法分析
2015 IEEE Wireless Power Transfer Conference (WPTC) Pub Date : 2015-05-13 DOI: 10.1109/WPT.2015.7139144
Seok Hyon Kang, V. Nguyen, C. Jung
{"title":"Analysis of WPT system using rearranged indirect-fed method for mobile applications","authors":"Seok Hyon Kang, V. Nguyen, C. Jung","doi":"10.1109/WPT.2015.7139144","DOIUrl":"https://doi.org/10.1109/WPT.2015.7139144","url":null,"abstract":"We investigate the indirect-fed magnetic resonant wireless power transfer system by rearranging the loops and coils used in the conventional wireless charging system for mobile devices. Three rearranged configurations (Out-Out, Out-In, In-In) have been considered and experimentally investigated by using hollow pipe copper loops (coils) and wire copper loops (coils). The power transfer efficiencies for the three configurations were similar. The highest measured efficiency of 82.5% was achieved at 35 cm distance between the Tx and Rx coils. We also investigated the practical application of the mobile device (note-pc), by rotating load loops and the Rx coil vertically, L-shape. The highest efficiency of the L-shape system, was 64.5 % at 45 cm distance between the Tx and Rx coils.","PeriodicalId":194427,"journal":{"name":"2015 IEEE Wireless Power Transfer Conference (WPTC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117243625","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}
引用次数: 12
Ferrite-loaded coil for uniform magnetic field distribution 磁场分布均匀的铁氧体负载线圈
2015 IEEE Wireless Power Transfer Conference (WPTC) Pub Date : 2015-05-13 DOI: 10.1109/WPT.2015.7140122
S. Jeong
{"title":"Ferrite-loaded coil for uniform magnetic field distribution","authors":"S. Jeong","doi":"10.1109/WPT.2015.7140122","DOIUrl":"https://doi.org/10.1109/WPT.2015.7140122","url":null,"abstract":"Uniformity of magnetic field distribution over a wireless charging surface can be improved by having high-permeability ferrite material. In this paper, 0.5mm-thick ferrite material is appropriately shaped and disposed above a power transmitting unit (PTU) resonator. As an example, a three-turn coil incorporating the ferrite is analyzed and measured. Simulation and measurement show that peak of magnetic field is significantly reduced by 55% while maintaining almost same average magnetic field strength on the wireless charging surface, compared to the same coil without ferrite. The benefit of having uniform magnetic field is also demonstrated by measuring the induced voltage on a receiver where the ratio between minimum and maximum voltage is within 1:2. This indicates that a power receiving unit (PRU) receives more uniform power delivery regardless of position on a charging area. The distance from the charging coil to the charging surface is as low as 2mm from the PTU resonator.","PeriodicalId":194427,"journal":{"name":"2015 IEEE Wireless Power Transfer Conference (WPTC)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116074195","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}
引用次数: 6
Tracking load to optimize power efficiency in RF to DC rectifier circuits 跟踪负载以优化射频到直流整流电路的功率效率
2015 IEEE Wireless Power Transfer Conference (WPTC) Pub Date : 2015-05-13 DOI: 10.1109/WPT.2015.7140165
S. Dehghani, S. Abbasian, T. Johnson
{"title":"Tracking load to optimize power efficiency in RF to DC rectifier circuits","authors":"S. Dehghani, S. Abbasian, T. Johnson","doi":"10.1109/WPT.2015.7140165","DOIUrl":"https://doi.org/10.1109/WPT.2015.7140165","url":null,"abstract":"A tracking load circuit for RF rectifiers is described. The tracking load is designed to maximize RF to DC conversion efficiency as the RF input power to the rectifier changes. The circuit consists of two DC to DC converters with two control loops. The duty cycle of the first stage converter is adjusted by an analog control loop to have an input impedance that is optimum for maximizing the power efficiency of the RF rectifier. A second stage converter, either a classical boost or buck converter, converts the fluctuating voltage from the first stage to a regulated output voltage. The application of the tracking load is illustrated with experimental results for a CMOS class D rectifier and a 10 W class F GaN RF rectifier.","PeriodicalId":194427,"journal":{"name":"2015 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116250462","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}
引用次数: 8
Beamforming power emitter design with 2×2 antenna array and phase control for microwave/RF-based energy harvesting 基于2×2天线阵列和相位控制的微波/射频能量收集波束形成功率发射器设计
2015 IEEE Wireless Power Transfer Conference (WPTC) Pub Date : 2015-05-13 DOI: 10.1109/WPT.2015.7140129
Sheng-Fan Yang, Tzuen-Hsi Huang, Chun-Cheng Chen, Chun-Yi Lu, Pei-Jung Chung
{"title":"Beamforming power emitter design with 2×2 antenna array and phase control for microwave/RF-based energy harvesting","authors":"Sheng-Fan Yang, Tzuen-Hsi Huang, Chun-Cheng Chen, Chun-Yi Lu, Pei-Jung Chung","doi":"10.1109/WPT.2015.7140129","DOIUrl":"https://doi.org/10.1109/WPT.2015.7140129","url":null,"abstract":"In this paper, a 915-MHz RF-power emitter with an antenna array controlled by phase shifters is proposed to make directional energy beam point to the energy harvesting (EH) receiver. For the beamforming request, a 2×2 patch antenna array and tunable 360° reflection-type phase shifters are designed. Measurement results show the energy transmission efficiency can be improved by 3.9 times higher than that of single patch antenna at one meter away under the same input power level. Furthermore, by applying ±15° beamforming control, transmission efficiency is increased by 2.7 times when receiving antenna placed at the angle of +24°.","PeriodicalId":194427,"journal":{"name":"2015 IEEE Wireless Power Transfer Conference (WPTC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132294385","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}
引用次数: 6
Strong resonant coupling for short-range wireless power transfer applications using defected ground structures 使用缺陷接地结构的短距离无线电力传输应用的强谐振耦合
2015 IEEE Wireless Power Transfer Conference (WPTC) Pub Date : 2015-05-13 DOI: 10.1109/WPT.2015.7140185
Sherif Hekal, A. Abdel-Rahman, H. Jia, A. Allam, R. Pokharel, H. Kanaya
{"title":"Strong resonant coupling for short-range wireless power transfer applications using defected ground structures","authors":"Sherif Hekal, A. Abdel-Rahman, H. Jia, A. Allam, R. Pokharel, H. Kanaya","doi":"10.1109/WPT.2015.7140185","DOIUrl":"https://doi.org/10.1109/WPT.2015.7140185","url":null,"abstract":"This paper presents a new structure for highly efficient short-range wireless power transfer. The proposed structure is based on strongly coupled resonators using H-slot defected ground structures. An equivalent circuit model for H-slot coupled resonators is introduced. Measurement results for the new proposed structure show a power transfer efficiency of 70% at 15 mm distance between driver and load resonators. Experimental measurements have shown good agreement with electromagnetic and circuit simulations.","PeriodicalId":194427,"journal":{"name":"2015 IEEE Wireless Power Transfer Conference (WPTC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132113036","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}
引用次数: 15
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