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[IEEE 2018 IEEE Biomedical Circuits and Systems Conference (BioCAS) - Cleveland, OH, USA (2018.10.17-2018.10.19)] 2018 IEEE Biomedical Circuits and Systems Conference (BioCAS) - Multi-coil High Efficiency Wireless Charger System for Hermetically Sealed Biomedical Implants
摘要： Biomedical inductively-coupled transcutaneous implants with internal batteries typically rely on a two-coil charging system which places fundamental and practical limits such as requiring short coil-to-coil distance for useful Wireless Power Transfer (WPT) efficiency. In case of hermetic metal enclosures equipped with finite size dielectric window for magnetic flux penetration, two-coil configurations can induce substantial additional loss due to eddy currents generated on e.g. Ti metal surface by fringing B-fields. Dissipative losses are unwelcome as they increase the temperature of the implant. We focus here on high-performance implants with internal electronic circuits and power source which require frequent, rapid battery recharging. The case example is a wireless broadband neural recording device capable of high data rate transmission (> 40 Mbps). We describe a compact planar four-coil configuration to achieve efficient Wireless Power Transfer (WPT) across tissue layers exceeding 1 cm. For the device geometry discussed here, our system transfers up to 73 % and 46 % of RF energy across 16 mm-separated source-to-load coil, in absence or presence of a Ti-enclosure which embeds the energy harvesting coil pair respectively. Thin sheets of ferrites are integrated to enhance local B-fields. We are able to charge a 200 mAh medical-grade battery to useful 84% of its full charge capacity (near current saturation) within 1 hour through a sapphire window integrated with the hermetic Ti- enclosure. The measured temperature increase is 2.1 ℃ with Ti-can immersed in still saline, slightly above FDA requirements or more recent ISO standards. From physiological models, we expect that active cooling by body tissue surrounding the implant (such as microvasculature perfusion) will provide for a safe and efficient WPT method.
关键词： biomedical implants,inductive charging,Eddy current heating,wireless charging
更新于2025-09-23 15:23:52
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[IEEE 2018 2nd IEEE Conference on Energy Internet and Energy System Integration (EI2) - Beijing, China (2018.10.20-2018.10.22)] 2018 2nd IEEE Conference on Energy Internet and Energy System Integration (EI2) - Design of PFC in Wireless Charging System for Electric Vehicle
摘要： A power factor correction (PFC) circuit is constructed, based on average period compensation method(APCM) in this paper. The cut-off frequency 2kHz and 10Hz are closed for current loop and voltage loop, and the phase margin of each loop is 80 degrees. By contrasting the THD of fundamental wave calculated to the 40th and the peak value of voltage ripple wave, PI values and transfer functions of both current loop and voltage loop are got. Then the input current and output voltage in PFC steady operation are simulated, and results are in accord with the small-signal model. In Simulink, the output capacitance is charged in advance and saturation controller is adopted, by which the overshoot of output voltage decreases by 6.3%, and the THD of input current is only 3.76%, which meet the demands for power-factor correction in wireless charging system for EV.
关键词： Average Period Compensation Method,Active PFC Circuit,Wireless Charging Technology
更新于2025-09-23 15:22:29
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Direct Synthesis and Design of Dispersive Waveguide Bandpass Filters
摘要： Wireless power transfer (WPT) is an emerging technology with an increasing number of potential applications to transfer power from a transmitter to a mobile receiver over a relatively large air gap. However, its widespread application is hampered due to the relatively low efficiency of current Wireless power transfer (WPT) systems. This study presents a concept to maximize the efficiency as well as to increase the amount of extractable power of a WPT system operating in nonresonant operation. The proposed method is based on actively modifying the equivalent secondary-side load impedance by controlling the phase-shift of the active rectifier and its output voltage level. The presented hardware prototype represents a complete wireless charging system, including a dc–dc converter which is used to charge a battery at the output of the system. Experimental results are shown for the proposed concept in comparison to a conventional synchronous rectification approach. The presented optimization method clearly outperforms state-of-the-art solutions in terms of efficiency and extractable power.
关键词： wireless charging,inductive power transmission,Dc-dc power converters,reactive power control,phase-shift control,rectifiers,impedance matching
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Efficient and Range-Variable Laser Wireless Charging Technology
摘要： The conversion efficiency of photovoltaic cells, charging distance and tracking technology are three important indicators of laser wireless charging technology. This paper demonstrates an efficient laser wireless charging scheme with variable charging distance and a simple tracking system. The laser wireless charging system proposed in this paper is mainly composed of 808nm laser, zoom beam expander, GaAs photovoltaic cell and the energy management module. By increasing the uniformity of laser spot energy distribution, the conversion efficiency of GaAs photovoltaic cells reaches 35.3%. Reduce system cost by simplifying the tracking system. Using zoom beam expander, the charging distance ranges from 10 to 50 meters.
关键词： GaAs photovoltaic cell,Zoom beam expander,Tracking system,Laser wireless charging
更新于2025-09-16 10:30:52
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Simulating the charging of electric vehicles by laser
摘要： At present, wired and wireless charging methods for electric vehicles (EVs) have a number of drawbacks including short charging ranges and long charging times. Laser power transfer (LPT) is a wireless power transfer technique which can be used for UAV (unmanned aerial vehicle) and satellite charging. Recent developments in photovoltaic cells and laser technology allows the transfer power using light which might overcome many of the issues related with other charging methods. In this paper, we describe the design and implementation (in MATLAB) of a novel, high-power charging method using a laser (monochromatic light) to charge electric vehicles. The paper examines the overall efficiency of the LPT for a various input power-level. In addition, it also examines the safety and the possible charging infrastructure for LPT technology. Using this technique, we believe that an overall efficiency of 10-37% can be achieved using existing technology.
关键词： Wireless charging,LPT,Electric vehicle
更新于2025-09-12 10:27:22
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[Lecture Notes in Electrical Engineering] Engineering Vibration, Communication and Information Processing Volume 478 (ICoEVCI 2018, India) || Design of an Energy Harvesting System for Wireless Power Transmission Using Microstrip Antenna
摘要： Power supply drives technological devices. As the wired world looks long antiquated, it is imperative transition towards wireless power transmission (WPT). WPT has been lately enticing in a varying range of applications in numerous ?elds and has also become a very alluring area of research activity because of the potential it has in providing solutions to our daily requirement, so the need arises to delve into it to explore new, innovative and ef?cient means of energy transmission. WPT will be indispensable in the imminent future, as this technology assists in the transmission of electrical energy to any device from the power source using air as the transmission medium without the use of any conductors. In this paper, an energy harvesting device is proposed to convert ambient electromagnetic waves, predominantly from the 2.4 GHz ISM radio frequency (RF) channel into direct current (DC) electricity. A microstrip antenna is designed along with a booster circuit to help charge devices wirelessly. This novel technology could be used for charging phone batteries on-the-go, thereby eliminating the hassles of wired connections.
关键词： Rectenna,Wireless power transmission,Energy harvesting,Wireless charging,Microstrip patch antenna
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - Macau, Macao (2018.9.26-2018.9.28)] 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - RWC: A Robust Wireless Charging System for Dockless Bike-Sharing
摘要： Bike-sharing, especially dockless bike-sharing, making a sensational progress of public transportation recently. The implementation of smart locking/unlocking module for shared-bikes has produced the issue of how to charge those modules efficiently for shared-bikes. Existing shared-bike charging technologies rarely take charging delay or user experience into consideration. In this paper, we propose RWC, a robust wireless charging system for dockless bike-sharing, which can provide stable recharging service without decreasing bike-sharing system’s service quality. RWC recharges shared-bikes via radio frequency (RF) energy harvesting. We design an RF wireless charging sensor node to integrate it on a bike’s basket, such that the mutual interference during charging process and space occupation can be reduced. RWC also includes a charging direction scheduling algorithm to reduce charging delay. The RWC system has been successfully implemented on a dockless bike-sharing system, which proves its effectiveness.
关键词： wireless charging,RF energy harvesting,sensor node,charging delay,Bike-sharing
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Magnetic Levitation Wireless Charging Platform with Adjustable Magnetic Levitation Height and Resonant Frequency for a Better Charging Efficiency
摘要： This paper mainly focuses on the combination of magnetic levitation height adjustment and wireless charging. The magnetic levitation height adjustment is provided by adding both an electromagnetic levitation coil and a ready-made magnetic levitation platform. This design changes the magnetic field strength of the electromagnetic levitation coil with a Pulse-Width-Modulation (PWM) signal in order to adjust the magnetic levitation height. The wireless charging uses a wireless charging coil with an adjustable resonant frequency and coordinates with the height of the magnetic levitation to find a better wireless charging efficiency.
关键词： Magnetic Levitation Wireless Charging Platform,Magnetic Levitation Height,Electromagnetic Levitation Coil
更新于2025-09-04 15:30:14