2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)最新文献

{"title":"Numerical Analysis of Reactive Power Distribution between Two Coupled Coils by Poynting Vector","authors":"Yuan Liu, A. Hu, Kehan Zhang","doi":"10.1109/WoW47795.2020.9291310","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291310","url":null,"abstract":"This paper analyses the reactive power distribution of an inductive power transfer (IPT) system with two coupled coils based on the Poynting vector. The imaginary part of the complex Poynting vector is analyzed by the cross-product of the magnetic and electric field at an arbitrary point to represent the reactive power density. The system is modelled with a time-varying current flowing through the primary coil, and the reactive power distribution is analyzed under both no-load and loaded conditions. Based on general theoretical analysis, three-dimensional numerical analysis by Computer Simulation Technology (CST) software was conducted to show the reactive power density distribution. It has found that the imaginary components of the Poynting vectors concentrate around the primary coil when the secondary is open-circuited without active power flow. When the secondary is connected with a uniformly distributed resistive load, the results show that the imaginary parts of the Poynting vectors concentrate along with the primary and the secondary coil respectively. This work is useful for understanding how the reactive power distributes and circulates between the two coils of an IPT system.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"26 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":"115369266","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":"Impedance Matching using Interspiraled Coils for Wireless Power Transfer","authors":"Yelzhas Zhaksylyk, U. Hanke, M. Azadmehr","doi":"10.1109/WoW47795.2020.9291325","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291325","url":null,"abstract":"This paper presents switchable interspiraled coils suited for active impedance matching in magnetic resonance wireless power transfer. The impedance matching network consists of single-turn coils placed in-between turns of a spiral resonator coil. The inductance variation allows matching over a range of distances in Wireless Power Transfer (WPT) systems. Measurements of a 9 turn coil with radius of 103 mm is presented. The measured self-inductances of the single-turn coils vary between 43–510 nH. Measurement of the power transfer efficiency verifies that the proposed interspiraled coils offer an active impedance matching in the under-coupled region for distance changes between 7 cm to 25 cm, The interspiraled coils can be realized on one side of a PCB and the other side can be used for control circuitry and routing, making it compact in size and potentially cheaper in production.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"121 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":"123484938","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":"Synchronization Control Method of Dual-Transmitter Wireless Power Transfer System with a Repeater","authors":"Jinde Wu, X. Dai, Yue Sun, Yugang Su, Zhihui Wang, Chunsen Tang","doi":"10.1109/WoW47795.2020.9291319","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291319","url":null,"abstract":"In order to improve the power transmission capacity of wireless charging system, a dual-transmitter wireless power transfer (DT-WPT) system with a repeater is presented in this paper. On this basis, in order to avoid the cancellation of the power injected by dual transmitters into the repeater, a method to keep the synchronization of the output voltage phases of the dual primary inverters is proposed in this paper. The method is achieved by adding a current-phase detection module in the system and it does not need communication between the two transmitting units.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"12 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":"115096199","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 Linear Extendable Phase-shift Controlled Multi-coil Transmitter Architecture for Wireless Power Transfer with 3D Magnetic Field Shaping","authors":"Ning Kang, Chengbin Ma, Ming Liu","doi":"10.1109/WoW47795.2020.9291301","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291301","url":null,"abstract":"Wireless power transmission (WPT) systems operating at MHz have advantages of small size and a high tolerance for coils misalignment. There is an urgent need for existing MHz WPT systems to improve coupling coils efficiency and positional freedom of the receiver simultaneously. There exist some ways for improving coils efficiency and positional freedom of the receiver, such as introducing repeater coils and employing special coils structures. However, lack of magnetic field strength can limit the freedom of the receiver, and the excessive coupling may cause inefficiency in coils. This paper proposes a phase-shift controlled multi-coil transmitter architecture. The architecture is linear extendable and it enables the 3D magnetic field shaping, which helps to improve the coupling coils efficiency and the spatial freedom of the receiver. The design of the compensation capacitors of the transmitting coils is discussed to achieve the optimal operation for the high-frequency power amplifier (PA) when considering the effect of the cross-coupling among transmitting coils. The mathematic model for the 3D magnetic field shaping is derived to prove the concept of the approach. The calculation results show the capability of 3D magnetic field shaping when using a two-coil transmitter as an example. The experimental results match well with the theoretical analysis and the simulation results. Three WPT systems are studied in the paper. Compared with the single transmitter system (STS) and the two-coil transmitter system (TTS) without phase-shift control (PSC), the TTS with PSC can maintain higher system efficiency in three degrees of freedom (vertical movement, horizontal movement, flip with fixed axis). In particular, only the TTS with PSC can work when the receiving coil is perpendicular to the transmitting coils. Therefore, due to the ability to shape the 3D magnetic field, the linear extendable multi-coil transmitter architecture with PSC has advantages in terms of the receiver freedom and the coupling coils efficiency.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"3 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":"122219311","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":"Bidirectional Wireless Power Transfer System with Optimized Coil Geometry","authors":"Simon Nigsch, Falk Kyburz, K. Schenk","doi":"10.1109/WoW47795.2020.9291296","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291296","url":null,"abstract":"Electric vehicles (EVs) offer the opportunity to use vehicle-to-grid (V2G) technology to utilize the vehicle battery as a grid connected energy storage device and deliver power to the grid and local loads. Recently, wireless power transfer (WPT) in EVs has been studied by numerous researchers due to advantages such as convenience of wireless operation and safety of inductive power transfer. Design challenges for WPT systems in EVs include high charging efficiency, a large air gap, and tolerance for misalignment. By optimizing the coupler coil geometry, the efficiency can be increased over a wide range of parking positions and ground clearances, while at the same time limiting the electrical component stress. With a new control method, the semiconductor stress is minimized and the losses are reduced compared to conventional control methods. A fully functional prototype with V2G capabilities was built, which reaches a DC-DC efficiency of almost 96 %.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"26 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":"116883122","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 Switchable Inductively Coupled Connector for IPT Roadway Applications","authors":"Vahid Zahiri Barsari, D. Thrimawithana, G. Covic, Seho Kim","doi":"10.1109/WoW47795.2020.9291300","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291300","url":null,"abstract":"A dynamic inductive power transfer (IPT) system is a safe and convenient solution to address the issues related to the limited battery capacity and travel distance of electric vehicles (EVs). In recent years, practical aspects of dynamic IPT systems have been investigated to advance various IPT technologies from laboratories to roadways. This paper suggests a configuration to mitigate some of the installation and maintenance concerns of IPT roadways by proposing a switchable inductively coupled connector. Besides providing galvanic isolation, the inductively coupled connector helps maintain a constant and load-independent current in the primary coupler. Moreover, each primary coupler is connected to a common H-bridge through a single DC switch minimizing the number of components required to energize each coupler independently. A mathematical analysis and simulation results have been provided to validate a scaled 3.3kW prototype IPT system employing the proposed configuration.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"5 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":"128308733","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":"Development of Partial Ferrite double-D Pad for IPT Systems for EV Charging","authors":"Tharindu Dharmakeerthi, Seho Kim, M. G. Pearce, G. Covic, D. Thrimawithana","doi":"10.1109/WoW47795.2020.9291309","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291309","url":null,"abstract":"Inductive power transfer (IPT) is a promising method for electric vehicle (EV) charging that is safe and practical. The critical aspects of IPT systems to achieve roadway charging are robustness, reliability, low cost and high power transfer. This paper presents two variations of a primary IPT double-D (DD) coupler that reduce ferrite volume, stray-fields and cost while having increased power rating at the expense of magnetic coupling and higher primary pad currents. A two-step ferrite shaping method is used for optimisation while keeping the primary coil and secondary pad unchanged. The ferrite volume is limited to the high flux density locations in a first step to reduce ferrite volume by 70%. Following this, an additional 14% ferrite volume is added to shape and reduce the stray fields by 23%.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"148 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":"128438023","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":"Sensitivity Analysis to Parameter Variations in LCC-S Compensated Inductive Power Transfer Systems","authors":"Qiang Bo, Yuwang Zhang, Yanjie Guo, Lifang Wang, Zhimeng Liu, Shufan Li","doi":"10.1109/WoW47795.2020.9291274","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291274","url":null,"abstract":"This paper focuses on the sensitivity analysis to parameter variations in a 1kW/85kHz LCC-S compensated inductive power transfer (IPT) system for electric vehicle (EV) applications. The impedance angle of the IPT system is sensitive to the compensation parameter variations, which will seriously affect the safe operation of the IPT system. Besides, the output power and efficiency will also be affected by those parameter variations. In this paper, mathematical models between impedance angle, output power, efficiency, and compensation capacitors are established, and the sensitivity of these indexes to compensation capacitor parameter variations is derived and analyzed by adopting the control variable method. Then, aiming at the effect of parameter variations on the IPT system, the methods of stabilizing the impedance angle and output power are discussed. Finally, a 1 kW IPT system was built to verify the validity of sensitivity analysis, all switches realize ZVS within the entire power range which can realize the reliable operation for the system, and 93.3% efficiency from de power source to battery load is achieved.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"15 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":"123623801","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":"Investigating the Interactions Between Capacitive Wireless Power Transfer Technology and Concrete","authors":"M. Arms, Kayla H. Truman-Jarrell, C. W. van Neste","doi":"10.1109/WoW47795.2020.9291305","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291305","url":null,"abstract":"A long term goal of power transfer technology is charging vehicles while operating in the transportation system. In order to efficiently accomplish this, the material of the roadway must be analyzed to ensure cooperation between the radio frequencies and the concrete as a whole. A few significant components can be examined. Specific concrete mix designs are very sensitive to constant changes in temperature resulting in cracking, therefore thermal effects were examined. In order to analyze the structural integrity of a material, material properties are calculated and analyzed. Tests could be performed to obtain the Dynamic Modulus of Elasticity before and after exposure to radio frequency. The test method performed had to be a non-destructive test method due to needed calculations before and after radio frequency.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"46 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":"125987712","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 New Multilevel Inductive Power Transfer System","authors":"Jaehong Lee, Myung-Yong Kim, Seung-Hwan Lee","doi":"10.1109/WoW47795.2020.9291259","DOIUrl":"https://doi.org/10.1109/WoW47795.2020.9291259","url":null,"abstract":"Conventional on-line inductive power transfer (IPT) systems use a 60- Hz transformer and a rectifier at their front-ends to step down a medium-level input voltage (22.9 kV or 25 kV) to a low voltage of 0.1 - 3 kVrms, so it is compatible with voltage ratings of commercial power switches. To achieve high output power level, multiple inverters and high-frequency transformers can be tied in parallel to the rectified DC bus. However, the 60-Hz transformer and the output high-frequency transformers are the main impediments that make the system bulky and expensive. This paper proposes a new on-line IPT system that utilizes multilevel inverters and excitation coils instead of the input and output transformers. Instead of the line frequency step-down transformer, series-connected active rectifiers and DC/AC inverters are used to convert the medium-level input voltage to multiple low-level voltage outputs. The excitation coils have strong magnetic coupling with the transmitter coil. Its magnetic field induces voltage and eddy-current in the transmitter coil and then, the transmitter coil induces a load current to a receiver coil via a loose coupling between the transmitter and the receiver. A theoretical analysis using an equivalent circuit model is presented. The frequency response of the input impedance and efficiency of the proposed IPT system are investigated. Also, an example design for the excitation coil is demonstrated. The feasibility of the proposed system is evaluated using a circuit analysis of a 4-level IPT system. The simulated efficiency of the proposed system was 88 % over a 7-cm air-gap.","PeriodicalId":192132,"journal":{"name":"2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"336 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":"115668840","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}