- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) - Shenzhen, China (2018.11.4-2018.11.7)] 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) - Performance Comparison of Primary Side PFM and Secondary Side PWM for SS Wireless Power Transfer CC/CV Control Strategy
摘要： Wireless Power Transfer (WPT) system for Electric Vehicle (EV) battery charging application popularity is increasing due to the safety, convenience, and eco-friendly issue. Nowadays, Lithium-Ion battery is well known as one of the potential for EV. However, Constant Current/Constant Voltage (CC/CV) control strategy needs to be adopted for achieving high efficiency charging and maintaining battery lifetime. By analyzing the gain curve, Pulse Frequency Modulation (PFM) can be used to perform CC/CV charging due to the load variation. The operating switching frequency needs to be considered and limited to prevent instability of the system. A typical drawback in the PFM control is the use of serial communication module for feedback data transmission from the secondary to the primary side. Therefore, the rectifier side controlled WPT can be a solution to remove the feedback communication part. In this paper, Pulse Width Modulation (PWM) applied in the secondary side (rectifier) for achieving CC/CV charging is investigated and compared with the traditional PFM control. The comparison study is verified by implementing a 3kW Series-Series (SS) WPT topology in the Power Simulation (PSIM) software. It shows that the secondary side PWM control strategy can achieve 94% efficiency during the 35 Ω load in CC mode, while the primary side PFM control only can achieve 88% efficiency.
关键词： PFM Controlled WPT,Wireless Power Transfer (WPT),CC/CV Mode,PWM Controlled WPT
更新于2025-09-23 15:22:29
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Application of FRA to Improve the Design and Maintenance of Wireless Power Transfer Systems
摘要： Frequency response analysis (FRA) plays an important role in the assessment of the mechanical integrity and hence, reliability of high-voltage power transformers. Wireless power transfer (WPT) system introduced by Tesla a 100 years ago based on Faraday’s law of electromagnetic induction is similar to a conventional power transformer. Therefore, the reliability of a large WPT system can also be evaluated using FRA measurement. When the WPT system is constructed, the electrical components and the desired transfer distance need to be ascertained accurately. Furthermore, the structure of the winding and the electrical characteristic of the components in WPT systems may vary due to aging or fault events. FRA measurement can examine the discrepancy between the WPT system parameters and the reference fingerprint data to provide cost-effective condition monitoring-based maintenance scheme for the WPT systems. This paper presents a detailed circuit analysis of a two-coil inductively coupled WPT model in different compensating topologies to accomplish efficient energy transfer. Then, FRA measurement is used to detect the variation in the amplitude and the phase angle of the developed circuit input impedance in a wide frequency range. In addition, displacements due to the placement of ferrite material and the variation of the transfer distance between the transmitter and receiver units are investigated through practical measurements.
关键词： RLC resonance,inductive power transfer (IPT),Frequency response analysis (FRA),wireless power transfer (WPT)
更新于2025-09-23 15:22:29
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A Generic Receiver Architecture for MIMO Wireless Power Transfer With Nonlinear Energy Harvesting
摘要： This letter investigates a multiple-input multiple-output (MIMO) wireless power transfer system under practical nonliner energy harvesting (EH) models. We propose a new generic energy receiver (ER) architecture consisting of N receive antennas and L recti?ers, for which one power splitter is inserted after each antenna to adaptively split the received radio frequency (RF) signals among the L recti?ers for ef?cient nonlinear RF-to-direct current (dc) conversion. With the proposed architecture, we maximize the total harvested dc power at the ER, by jointly optimizing the transmit energy beamforming at the energy transmitter and the power splitting ratios at the ER. Numerical results show that our proposed design by exploiting the nonlinearity of EH signi?cantly improves the harvested dc power at the ER, as compared to two conventional designs.
关键词： Wireless power transfer (WPT),non-linear energy harvesting (EH),transmit energy beamforming,adaptive power splitting
更新于2025-09-23 15:22:29
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A Dual-Mode RF Power Harvesting System With an On-Chip Coil in 180-nm SOI CMOS for Millimeter-Sized Biomedical Implants
摘要： In this paper, we present a dual-mode power harvesting system for millimeter-sized biomedical implants that are immune to the variation of wireless link parameters and loading. The design includes a multistage full-wave voltage rectifier, a power management unit, and a low dropout voltage regulator. Depending on the received RF power level and the required power by the load, power delivery is conducted in a continuous or duty-cycled mode. The system is fabricated in 180-nm silicon on insulator (SOI) CMOS technology with an active area of 2.56 mm2 including an on-chip coil. RF power is transferred to the chip from a 2 × 2 cm2 coil through 10 mm of air at 434 MHz. The efficiency of the designed wireless link, which is the power transfer efficiency from the external coil to the on-chip coil, reaches up to 0.68% (?21.7 dB) at 10-mm separation through air. Keeping the transmitted RF power below 24 dBm, the system can provide a 1.08-V dc voltage for resistive loads larger than 20 kΩ continuously over time. When the harvested power is not enough to drive the load continuously, the system operates in the duty-cycled mode. Measurement results show that the system can drive a 1-kΩ load in the duty-cycled mode when the transmitted power level is 15 dBm.
关键词： voltage rectifier,millimeter-sized implant,power management,on-chip coil,CMOS,rectenna,low dropout (LDO) regulator,wireless power transfer (WPT)
更新于2025-09-23 15:21:21
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One Octave Bandwidth Rectifier With a Frequency Selective Diode Array
摘要： In this paper, a high-efficiency rectifier with one octave bandwidth is proposed by proposing a diode array with a frequency selective topology. With the frequency selective topology, the low-and high-band rectifiers are combined together without extra matching circuit at the input leading to a high-efficiency broadband design. For validation, a prototype rectifier was fabricated and characterized. The measured results show that the RF-dc power conversion efficiency (PCE) maintains above 70% from 1.75 to 3.55 GHz at an input power of 10 dBm. The measured PCE remains more than 50% within 1.4–3.7 GHz and the |S11| is lower than ?10 dB from 1.7 to 3.6 GHz.
关键词： energy harvesting (EH),frequency selection,high efficiency,Broadband RF rectifier,impedance matching,wireless power transfer (WPT)
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Design of Loosely Coupled Transformer of Wireless Power Transfer for Higher Misalignment Tolerance of System Efficiency
摘要： The offset between the primary and secondary couplers of the Loose-Coupled Transformer (LCT) results in deviation in the efficiency of the wireless transmission system. In order to obtain higher efficiency deviation tolerances, a three-loop LCT structure is proposed. The LCT's intermediate couplers are slightly larger than primary and secondary couplers. A 30mm air gap between primary and intermediate couplers exists. The compensation capacitance of the proposed intermediate coupler is variable. Moreover, when the horizontal or vertical offset between the primary and secondary couplers reaches 200 mm or 50 mm, respectively, the intermediate couplers can move with the secondary couplers. At the same time, the proposed LCT control strategy is optimized. A 3-kW prototype was developed for experimental verification, which proved the effectiveness of proposed LCT and control strategy.
关键词： misalignment tolerance of efficiency,moveable intermediate coil,variable compensate capacitor,loosely coupled transformer (LCT),Wireless power transfer (WPT)
更新于2025-09-12 10:27:22
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[IEEE 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Xi'an, China (2019.6.19-2019.6.21)] 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Channel Tracking and Hybrid Energy Beamforming for WPT Enabled IoT System with Mobile mMIMO BS
摘要： In this paper, we consider the channel tracking and energy hybrid beamforming for the wireless power transfer (WPT) enabled Internet of Things (IoT) system, where the mobile base station (MBS) serves a set of half-duplex (HD) sensors that are uniformly distributed within its coverage area. A linear Kalman filter based multipath channel tracking and hybrid energy beamforming scheme is proposed by investigating the temporal and spatial properties of channel. Firstly, the Doppler frequency offset (DFO) is compensated through beam alignment and capturing the precise angular information from signals. Then, the multipath channel is tracked during the angle of arrival time (AOAT). Finally, the hybrid beamforming is applied to realize downlink WPT and uplink data transmission. The superiority of the proposed scheme is evaluated through simulations.
关键词： angle of arrival time (AOAT),mobile base station (MBS),wireless power transfer (WPT),hybrid energy beamforming,Kalman filter,Internet of Things (IoT),Channel tracking,Doppler frequency offset (DFO)
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE 13th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) - Sonderborg, Denmark (2019.4.23-2019.4.25)] 2019 IEEE 13th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) - Active Class E Rectifier with Controlled Output Voltage for Megahertz Wireless Power Transfer
摘要： Wireless power transfer (WPT) is desirable for its elimination of direct electrical contact, i.e., safer charing solution, water-proof and dust-proof capability, sterile environment application, etc. However, the variable working conditions, such as the coupling coil relative position, can always lead to output voltage ?uctuations. Therefore, output voltage regulation is especially necessary for the charging of electronic terminals. This paper proposes an active Class E recti?er that can perform both high frequency recti?cation and output voltage regulation. The basic working principle of the active recti?er is explained and design guidance is provided. Both simulations and experiments are done to demonstrate the proposed design and desired performance. With the duty cycle control of the active recti?er, an constant output voltage can be maintained under a varying coupling coef?cients and ?nal DC load.
关键词： active Class E recti?er,output voltage regulation,duty cycle control,Wireless power transfer (WPT)
更新于2025-09-11 14:15:04
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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) - The Optimization of Auxiliary Detection Coil for Metal Object Detection in Wireless Power Transfer
摘要： For the safety of customers and WPT Electrical Vehicles (WPTEVs), Metal Object Detection (MOD) is a necessary module in the whole WPT system design. In this paper, auxiliary detection coil which utilizes the influence of metal objects on the detection voltage is used as the method to achieve the MOD and an equation which can optimize the design of MOD auxiliary detection coil is proposed. To optimize the detection coil, approximate quantitative description of voltage change in the detection coil is done by modeling the effect of a metal object. A comparison between the simulation and equation’s numerical analysis results is presented that verifies the use of proposed equation. The influence of the radius, turns and position of auxiliary detection coil on voltage variation are also analyzed. And at the end of the paper, the testing result is proposed to verify the feasibility of the optimization method of this auxiliary detection coil design.
关键词： metal object detection (MOD),wireless power transfer (WPT),auxiliary detection coil
更新于2025-09-11 14:15:04
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[IEEE 2018 2nd International Conference on Biomedical Engineering (IBIOMED) - Bali, Indonesia (2018.7.24-2018.7.26)] 2018 2nd International Conference on Biomedical Engineering (IBIOMED) - Study of Midfield Wireless Power Transfer for Implantable Medical Devices
摘要： Mid-?eld wireless power transfer (MF-WPT) is a scheme developed for transcutaneous power transfer to micro-implants kept deep inside the body in GHz frequency. With deep seated implants, the possible locations available for application increases to almost the entire body. But, this advantage of applicability is severely limited as the power delivered to the micro implants by MF-WPT is very low -in the range of few 100W. Yet, the mid-?eld operations have higher ef?ciency in miniaturized weakly coupled coil implants compared to traditional near-?eld system. So, with improvement in certain aspects, MF-WPT is expected to play a vital role in biomedical ?eld. For the same reason this paper focuses on analyses of literature available in various aspects of MF-WPT, its challenges, drawbacks and future scope of the scheme in medical ?eld.
关键词： Mid?eld wireless power transfer,Wireless Power Transfer(WPT),Biomedical device
更新于2025-09-10 09:29:36