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A Compact Wireless Power Transfer System at 915 MHz with Supercapacitor for Optogenetics Applications
摘要： To facilitate sophisticated optogenetics research with minimal disruption to animal’s behavior, a fully wireless optical stimulator module is desirable. This paper presents a compact wireless power transfer (WPT) system for optogenetics applications that is adapted to work in implanted condition with unstable and insufficient ambient RF energy field. The scope of this work is to design and implement a power transfer system architecture that is able to: 1) work over long distance, 2) achieve high power conversion efficiency and 3) provide stable output power for sufficient time duration. The designed WPT circuit operates at 915 MHz and achieves maximum power conversion efficiency of 50% at -15 dBm input power. With a compact circuitry design (12.20 × 13.22 mm), the obtained full power transmission efficiency was 0.329 % at 20 dBm (100 mW) transmission power. Ex-vivo experiments indicated that when the WPT system was located 10 cm from the source, it retrieved a maximum of 0.324 mW in free space, and 0.112 mW if inserted inside porcine cadaver meat with 4 cm of thickness. At a distance of 1 m from the source, the system retrieved 17 μW in free space, and 1 μW in porcine meat. Furthermore, to sufficiently drive the LED, an advanced supercapacitor was utilized as an energy storage element. When fully charged, the system can supply the LED over 75 seconds with a total power of 2.45 W. The developed WPT system can be a viable solution to be applied in optogenetic experiments on laboratory animals for preclinical studies.
关键词： Optogenetics,Bioimplantable,Wireless power transfer,Voltage multiplier,Supercapacitor
更新于2025-09-10 09:29:36
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Development of Intelligent Drone Battery Charging System Based on Wireless Power Transmission Using Hill Climbing Algorithm
摘要： In this work, an advanced drone battery charging system is developed. The system is composed of a drone charging station with multiple power transmitters and a receiver to charge the battery of a drone. A resonance inductive coupling-based wireless power transmission technique is used. With limits of wireless power transmission in inductive coupling, it is necessary that the coupling between a transmitter and receiver be strong for efficient power transmission; however, for a drone, it is normally hard to land it properly on a charging station or a charging device to get maximum coupling for efficient wireless power transmission. Normally, some physical sensors such as ultrasonic sensors and infrared sensors are used to align the transmitter and receiver for proper coupling and wireless power transmission; however, in this system, a novel method based on the hill climbing algorithm is proposed to control the coupling between the transmitter and a receiver without using any physical sensor. The feasibility of the proposed algorithm was checked using MATLAB. A practical test bench was developed for the system and several experiments were conducted under different scenarios. The system is fully automatic and gives 98.8% accuracy (achieved under different test scenarios) for mitigating the poor landing effect. Also, the efficiency η of 85% is achieved for wireless power transmission. The test results show that the proposed drone battery charging system is efficient enough to mitigate the coupling effect caused by the poor landing of the drone, with the possibility to land freely on the charging station without the worry of power transmission loss.
关键词： hill climbing,drone station,unmanned aerial vehicle,wireless power transfer,automatic charging station
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE International Conference on Electron Devices and Solid State Circuits (EDSSC) - Shenzhen (2018.6.6-2018.6.8)] 2018 IEEE International Conference on Electron Devices and Solid State Circuits (EDSSC) - Analysis on Transfer Efficiency of Five Different Antenna Configurations in Short-Distance Wireless Power Transfer
摘要： This paper proposes four newly-designed antenna configurations for the applications of short-distance wireless power transfer. The antennas are developed from a traditional circular loop antenna, which have a structural feature in common that all of them are in enclosed shape. Four proposed designs aim to improve the transfer efficiency. In this work, the transmitting antenna faces to the receiving antenna with a distance of 12 cm in the wireless power transfer system. Results show that two of them have better performance of transferring power than the other two and the conventional design.
关键词： antenna configurations,loop antenna,transfer efficiency,wireless power transfer
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu, China (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - A High Efficiency Multi-Receiver Wireless Power Transfer System with Unanimous Power Reception at a Certain Angle
摘要： This paper presents a high efficiency magnetically coupled resonant wireless power transfer(MCR-WPT) system which can achieve uniform power distribution for five receivers that are at different positions and an angle with the horizontal plane. Both the receiver and transfer coils utilize a single coil structure. This paper analyzes the change of the coupling coefficient with the variation of angle of the non-axial receiver coil. In order to make the non-axial receiver gets the maximum power, it is necessary to adjust the coupling coefficient to the maximum by deflecting the receiver an angle. A prototype is fabricated and tested. The simulation and test results are in good agreement. The overall system efficiency reaches 89.16%, and the five receivers can receive almost the same power.
关键词： non-axial receiver,unanimous power reception,high efficiency,Multi-Receivers,wireless power transfer(WPT)
更新于2025-09-09 09:28:46
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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) - Power Handling Capability of Self-Resonant Structures for Wireless Power Transfer
摘要： The range and ef?ciency of resonant inductive wireless power transfer depends on the quality factor of the resonant coils. A multilayer self-resonant structure (MSRS), made of many alternating layers of thin foil conductors and dielectric, has been shown to have a quality factor many times higher than conventional resonant coils of similar size. To date, the MSRS has only been modeled and tested for small-signal excitations and the impact of large-signal excitations on the MSRS performance has not been considered. This paper explores large-signal effects such as Steinmetz core loss, temperature dependence of winding and core losses, and the thermal effect of loss in order to determine the power handling capability of the MSRS. The analysis shows that a 6.6 cm-diameter prototype MSRS is capable of transferring as much as 10.7 kW over a 0.5 cm gap and 760 W over 2.2 cm, for maximum 40 ?C temperature rise in a 25 ?C environment.
关键词： power handling capability,thermal modeling,multilayer self-resonant structure,wireless power transfer,quality factor
更新于2025-09-09 09:28:46
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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) - Modified Series-Series Compensation Topology for WPT Systems
摘要： Wireless Power Transfer Systems use a wide selection of different compensation topologies to enhance one or the other of their characteristics. Among the simplest topologies, the series-series compensation offers high efficiency in a wide range of transferred power but requires an effective control of the output voltage and of the supply current when used in applications where the load varies substantially in order to protect the system from overvoltage or overcurrent. This paper presents a modified series-series compensation topology that inherently implements this protection at the expenses of a small decrease of the transfer efficiency. At high loads, the modified series-series topology operates as the conventional one, but at low loads its behavior changes limiting the transmitting side current and the output voltage. A preliminary analysis of operations of the proposed topology is performed in the time domain, then it is completed in the phasor domain and, finally, the obtained results are checked against those obtained by simulation implemented in the PSIM environment.
关键词： Wireless Power Transfer (WPT),Series-Series compensation,Extreme operating condition
更新于2025-09-09 09:28:46
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Superconducting electrode capacitor based on double-sided YBCO thin film for wireless power transfer applications
摘要： A high-temperature superconducting (HTS) electrode capacitor (HTS capacitor) has been reported for the first time in the form of a superconductor–insulator–superconductor structure. Double-sided HTS thin film might be inherently suitable for the raw material choice of an HTS capacitor. In terms of electrode material, HTS thin film has a much lower surface resistance than normal conductors, and, as a dielectric medium, its substrate generally has a larger dielectric constant but a smaller loss tangent than the dielectric layers of some conventional capacitors. Thus, it is possible to fabricate a high-quality capacitor based on double-sided HTS thin film. This type of HTS capacitor could play a role in wireless power transfer (WPT) technology, since the WPT efficiency depends on the quality factors of both the coil and capacitor. Numerous studies have been performed to optimize the WPT system with HTS coil. In contrast, we develop an HTS capacitor based on double-sided YBCO film for WPT applications and investigate its effect on the WPT system. It is found that the HTS capacitor can provide a high quality factor, enhance WPT efficiency, and work normally with an HTS coil at 77 K, avoiding the dilemma between an HTS coil and a normal capacitor.
关键词： superconducting electrode capacitor,double-sided YBCO thin film,wireless power transfer
更新于2025-09-09 09:28:46
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Effects of Foreign Metal Object on Soft-Switching Conditions of Class-E Inverter in WPT
摘要： A foreign metal object will deteriorate the performance of wireless power transfer (WPT) systems and cause insecurity issues. Therefore, the in?uence principles and rules of foreign metal objects on soft-switching conditions of Class-E inverters and the performance of WPT systems are developed in this paper. The effects of different metal materials on coil parameters at different frequencies and positions are analyzed ?rst, then the effects of foreign metal objects on soft-switching conditions of Class-E inverters and the power transfer capability of WPT systems are investigated. Principle analyses and simulation results demonstrate that there are signi?cantly different effects on the soft-switching conditions and power transfer when a foreign metal object is placed near the transmitter coil or the receiver coil. In addition, the monotonicity of the variation in power transfer also depends on the position of the foreign metal object. Finally, a WPT experimental prototype with a Class-E inverter is implemented to verify the in?uence principles and rules of foreign metal objects. The experimental results are highly consistent with the principle analyses and simulation results.
关键词： foreign metal object,soft-switching conditions,Class-E inverter,wireless power transfer
更新于2025-09-09 09:28:46
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[IEEE 2018 International Power Electronics Conference (IPEC-Niigata 2018 –ECCE Asia) - Niigata, Japan (2018.5.20-2018.5.24)] 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) - Wireless Power Transfer: Critical Review of Related Standards
摘要： Wireless power transfer system (WPT) turned to be a reliable and an appropriate strategy, which found many applications. However, there is a growing concern about two safety issues. The first one is linked to the human exposure to electromagnetic fields (EMFs) that may cause potential health hazards. The second issue is the electromagnetic compatibility (EMC), where WPT systems may cause disturbance to electrical circuits. With the rapid development of WPT systems including the wide range of frequency and power, many leading countries in WPT industry have set many standards and regulations for safety usage of WPT. However, due to the complexity and variety of these standards, it is usually difficult to follow for both researchers and electrical engineers. This paper aims to provide a review for the recent standards and regulations concerning WPT industry and its applications. Therefore, a simple classification with a comprehensive comparison is presented.
关键词： electromagnetic fields,wireless power transfer,EMI standards,Electromagnetic compatibility
更新于2025-09-09 09:28:46
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Uneven-to-Even Power Distribution for Maintaining High Efficiency of Dual-Linearly Polarized Rectenna
摘要： The RF-to-dc power conversion ef?ciency (PCE) of the conventional dual-linearly polarized (DLP) rectenna often suffers from uneven RF power received by two ports of the DLP antenna, which is caused by a tilt angle between the linearly polarized incidence and the two polarizations of the antenna. In this letter, a hybrid coupler is employed to redistribute the uneven power from the DLP antenna to two even power distributions for a successive modi?ed Greinacher charge pump (GCP). Thus, a high RF-to-dc PCE of the modi?ed GCP can be maintained. Both theoretical analysis and experiment validate the proposed power distribution scheme, which maintains a stable high PCE of a DLP rectenna irrespective of polarization tilt angle. The proposed scheme is, thus, suitable for high-ef?ciency wireless power transfer.
关键词： wireless power transfer (WPT),hybrid coupler,Dual-linearly polarized (DLP) rectenna
更新于2025-09-09 09:28:46