- 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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Fabrication of large scale PS monolayer colloidal crystal film by using a novel secondary self-assembly method for nanoimprint technique
摘要： In the dynamic wireless power transfering(WPT) process of electric vehicle, the charging current of the battery is affected by some factors, such as the primary coil current and the relative position of the primary and secondary coils. Moreover, due to the travel of the electric vehicle, it is difficult to establish effective feedback between the primary side and secondary side. In this case, the charging method based on the primary side and secondary side independent control is analyzed. In this paper, it shows that the PID controller is set up after modeling the transmitter and the receiver. The effectiveness of this strategy is also verified by simulation on MATLAB.
关键词： WPT,electric vehicles,constant current control,PID
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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[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) - A High-Efficiency 35GHz Rectenna with compact structure for rectenna arrays
摘要： A 35GHz rectenna with high efficiency and compact structure is proposed in this paper. A patch antenna fed by the coupling slot is employed to receive power from free space. The structure of designed rectifier is compact and printed on the bottom side of the antenna. The input low-pass or band-pass filter of the rectifier is removed. Instead, a short ended microstrip line is introduced as a band stop structure to block the harmonics and match the impendence. This circuit configuration highly simplifies the total topology and is suitable for rectenna arrays applications. Furthermore, removing the input filters reduced the insertion loss and thus improved the microwave-to-dc (MW-DC) conversion efficiency. The rectenna is designed, fabricated and measured, a maximum MW-DC efficiency of 53.2% is achieved for a power density of 51.2 mW/cm2 with the dc load 250 Ω at 35 GHz.
关键词： compact structure,millimeter-wave rectenna,high conversion efficiency,WPT
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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A High Efficiency LCC-S Compensated WPT System with Dual Decoupled Receive Coils and Cascaded PWM Regulator
摘要： A LCC-S compensated wireless power transfer (WPT) system with dual decoupled receive coils and a cascaded PWM regulator is proposed in this paper. The dual decoupled receive coils, comprising of bipolar coil and unipolar coil, provide two power paths. Most of input power is transferred to load directly through bipolar coil while only small portion of input power is transferred through unipolar coil and the cascaded PWM regulator, which can reduce power loss effectively. The output voltage of WPT system is regulated by the cascaded PWM regulator, thereby wireless communication links (WCLs) is not required in the feedback control loop, which leads to simple control circuits and good stability. Compared with conventional WPT system with two-stage power conversion, it is cost-effective as voltage/current stress of PWM regulator can be significantly alleviated. Besides, the LCC-S compensated WPT system can operate under zero phase angle (ZPA) condition with low voltage-ampere rating components. A 1.5kW prototype is built and experimental results show that the system efficiency up to 93% can be achieved under full load, which is 2.3% higher than that of conventional WPT system with two stage power conversion.
关键词： LCC-S compensated WPT system,wireless communication links (WCLs),dual decoupled coil structure,duty cycle control,cascaded PWM regulator
更新于2025-09-23 15:19:57
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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