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[IEEE 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW) - Montréal, QC, Canada (2018.6.3-2018.6.7)] 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (Wow) - Efficiency Optimization of Wirelss Power Transfer System with Traction Motor Load for Modern Tram
摘要： Efficiency is an important index for high power wireless power transfer system. Combined with the characteristic that the normal traction demand of the modern tram can be satisfied when the input DC voltage of the traction inverter is in a certain range, an efficiency optimization method of WPT system with inductor/capacitor/capacitor (LCC) compensation structure used for the modern tram power supply is proposed by adjusting the phase shifting angle of the primary inverter according to the traction power. Without increasing the hardware circuit, the proposed method can maintain the transfer efficiency as high as possible under different operating conditions. Theoretical analysis and simulation verify the effectiveness of the proposed method.
关键词： motor,Wireless power transfer system,efficiency
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Microrobot propulsion force generation using semiconductor based wireless power transfer coils
摘要： Currently, various kinds of biomedical microrobots have been proposed for medical and industrial applications. In order to maximize the utilization of microrobots, a method of supplying electrical energy by wireless power transfer has been proposed. Nevertheless, one of the critical issues of microrobot is miniaturization. In this paper, we successfully demonstrated 2.6 mm sized microrobot using wireless power transfer system to produce the propulsion force and transfer electric power simultaneously. A micro robot with several millimeters was fabricated using a semiconductor process, which was used in experiments. A 2.6 mm×2.6 mm sized spiral coil microrobot have been successfully demonstrated with 2.1 mm/s.
关键词： microrobot,Lorentz force,wireless power transfer,phase control,propulsion
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC) - Budapest, Hungary (2018.8.26-2018.8.30)] 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC) - Design Considerations of GaN Transistor Based Capacitive Wireless Power Transfer System
摘要： The paper discusses and evaluates design of capacitive wireless power transfer (WPT) system. The capacitive WPT can replace a conventional inductive WPT for example in applications where metallic objects are placed close to receiver or transceiver. Main limitation for wider application of the capacitive WPT is due to small coupling capacitance between two surfaces in limited space. Therefore, to utilize capacitive WPT system the switching frequency should be as high as possible. Challenges associated with design of capacitive WPT system operating in MHz range are discussed in this paper. In the paper it is described WPT system that consists of two copper plates to transfer power from the primary side to the secondary side. Some calculation considerations of resonant network is given in the paper. The high switching of inverter transistors requires high performance transistors with optimized driver circuit. The design of GaN transistor based inverter and driver circuit is discussed and experimental results are shown.
关键词： wireless power transfer,capacitance,electric field,high frequency inverter
更新于2025-09-09 09:28:46
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A Smart Autonomous WPT System for Electric Wheelchair Applications with Free-Positioning Charging Feature
摘要： Electric Wheelchairs (EWs) are gradually replacing conventional wheelchairs as an assistive tool for people with disabilities who are unable to use physical force to drive manual wheelchairs on their own. EW charging requires manipulating, plugging in, and unplugging an off-board charger, which can be challenging or impossible for people with severe disabilities. In this paper, a comprehensive solution to the problem of EW recharging is provided in the form of a smart, autonomous charging system, based on Wireless Power Transfer (WPT) technology. In this research, a sufficiently large area of 0.75 m2 for a floor-charging pad involving multiple primary coils has been implemented while offering a free-positioning charging feature. A novel design methodology for primary and secondary charging pads optimization has been developed, taking into account various complex real-life constraints. In addition, a novel 250-W WPT controller design has been employed to maximize misalignment tolerance up to 7 cm while maintaining high system efficiency. In this paper, a novel, comprehensive, system-level organization of a master controller design has been presented which manages continuous coordination between the WPT controllers and the autonomous docking controller, records important system data, maintains safe operation of overall system, and prevents hazardous exposure to potentially harmful magnetic field beyond 15 μT. Additionally, a novel design methodology for primary and secondary charging pads optimization has been developed, that takes into account various real-life constraints, and provides a fair comparison between different designs in a multivariable environment. The proposed design is tested in laboratory conditions and later validated in a practical environment.
关键词： ground robotics,free positioning,Dynamic contactless battery charging,electric wheelchair,wireless power transfer,stationary charging,assistive autonomy
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Kota Kinabalu, Malaysia (2018.10.7-2018.10.10)] 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Enhancement of Wireless Power Transmission Based on Side-Positioned Metamaterials
摘要： Inserting a metamaterial slab between the source and receiver coils of the wireless power transfer (WPT) system is a conventional way to improve the transmission performance. However, the free energy transfer space benefited from WPT system is impeded by the inserted metamaterial slab. This paper explores effects of side-positioned metamaterial slabs on wireless power transmission efficiency. Simulations of the WPT system indicate that the side-positioned meta material slab can achieve the same improvements as the center-positioned one in terms of the wireless power transmission, which was verified by experiments. the experiments show that more side-positioned metamaterial energy the significantly. Therefore the side-positioned metamaterial slabs are more efficient and flexible for enhancement of practical WPT systems.
关键词： side- transmission,wireless power transfer,center-positioned,metamaterials,wireless power postitoned
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Dual Polarized Metasurface for Microwave Energy Harvesting and Wireless Power Transfer
摘要： We introduce the design of a dual polarized metasurface collector based on the metamaterial full absorption concept for electromagnetic energy harvesting. Different from previous metamaterial absorber designs, here the power absorbed is mostly dissipated across a resistive load rather than in the dielectric substrate. This is achieved by channeling the absorbed power to an optimal resistive load through a via hole. The simulation results show that power absorption efficiency of 98% is achieved at an operating frequency of 2.5 GHz for a single unit cell. A super unit cell consisting of 4 cells with alternating vias was also designed to produce a dual polarized metasurface. The simulation results yielded a radiation to AC efficiency of around 90% for each polarization.
关键词： metamaterial,dual polarized,wireless power transfer,metasurface,microwave energy harvesting
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Multi-Polarization Planar Dipole Array Surface for Electromagnetic Energy Harvesting and Wireless Power Transfer
摘要： We present a design of a multi-polarization electromagnetic energy harvesting surface inspired by a multi-layer unit cell of printed asymmetrical metallic dipolar elements. The harvesting array features two layers that collectively capture the incident energy from various incident angles. The harvester was ?rst analyzed for maximizing radiation to AC absorption where each dipole was terminated by a resistor across its energy-collecting gap. The simulation results show an average ef?ciency of 90% for the radiation to AC conversion at various incident angles. As a proof of concept, a multi-layer array consisting of 3x3 asymmetrical dipolar elements of the de?ned multi-layer unit cell was fabricated and measured experimentally. The experimental results yielded an overall radiation to DC harvesting ef?ciency of 70% for multiple incident polarizations.
关键词： dipole array,electromagnetic absorber,wireless power transfer,rectennas,Energy harvesting,recti?cation
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Comprehensive Design for 6.78 MHz Wireless Power Transfer Systems
摘要： The call for higher power and larger spatial freedom has driven the operating frequency of wireless power transfer (WPT) systems into the MHz range. Previous system design methods focus on designing the coils to attain high quality factor while remaining resonant around the working frequency and subsequently designing switching circuit hardware and operating point to minimize the system power loss. This sequential design method over-simplifies the system, neglecting inter-dependencies between system components, which leads to suboptimal designs. This paper presents a system design method that co-optimizes coils, power stages, and circuit operation for maximum overall efficiency, based on accurate models of converters and WPT system. The system model and the importance of co-design are verified by a 6.78 MHz WPT prototype.
关键词： 6.78 MHz,system design,wireless power transfer,MHz range,co-optimization
更新于2025-09-04 15:30:14
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Load-Independent Wireless Power Transfer System for Multiple Loads Over a Long Distance
摘要： In this paper, a novel long-distance wireless power transfer (WPT) system using repeater coils is proposed to provide power supplies for the driver circuits in high voltage applications such as flexible alternative current transmission systems (FACTS). Different from most of the existing wireless repeater systems where the load is only connected to the last coil and the repeater coils function solely as power relays, in the proposed system, multiple loads are powered by the repeaters. The repeater coils transfer power not only to the subsequent coils but also to the loads connected to them. Dual coil design is proposed for the repeaters with which load-independent characteristics are obtained with a suitable design of coupling coefficients. As a result, the load power can be easily adjusted without affecting each other. Load current characteristics and system efficiency have been analyzed in detail. The power transfer capability of the proposed system is illustrated for different coil quality factors and coupling coefficients. An experimental setup with 10 loads has been built to validate the effectiveness of the proposed long-distance WPT system. The maximum reachable system efficiency is about 84%.
关键词： dual coil design,Wireless power transfer (WPT),constant load characteristics,current independent,long distance
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM) - Nagoya, Japan (2018.8.29-2018.8.31)] 2018 IEEE International Workshop on Electromagnetics:Applications and Student Innovation Competition (iWEM) - A Hybrid MoM/FDTD Method for Exposure Assessment of Wireless Power Transfer Systems
摘要： A hybrid method combining method of moments (MoM) and finite-difference time-domain (FDTD) method is proposed to evaluate exposure in a human body close to wireless power transfer (WPT) systems. Validation of the proposed method has been demonstrated by analysis of a WPT system close to a dielectric cube. Finally, the proposed method was used to determine specific absorption rate inside a human body in the vicinity of a spiral-type WPT system.
关键词： hybrid method,method of moments,exposure assessment,FDTD,wireless power transfer
更新于2025-09-04 15:30:14