Wireless Power Transfer—An Overview

Zhang, Zhen; Pang, Hongliang; Georgiadis, Apostolos; Cecati, Carlo

doi:10.1109/tie.2018.2835378

Cited by 1,214 publications

(378 citation statements)

References 108 publications

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“…Additionally, when the traffic light is green, the proposed system is also one part of the dynamic wireless charging system for the running EVs on road. During the process that the system operates as the dynamic wireless charging system while the traffic light is green, most research of the dynamic wireless charging system contains only one load according to the system structure and the safe driving distance, such as [20] and [21]. While the traffic light is red, the EVs in the proposed system are parking or moving with a very low speed.…”

Section: System Descriptionmentioning

confidence: 99%

Power Stabilization based on Switching Control of Segmented Transmitting Coils for Multi Loads in Static-Dynamic Hybrid Wireless Charging System at Traffic Lights

et al. 2019

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In order to promote the driving range of the electric vehicles (EVs), decrease the demand for large capacity battery and create more charging opportunities for the EVs, the static-dynamic hybrid wireless charging system is presented to utilize waiting time of traffic lights at intersections to replenish electricity in this paper. Firstly, the topology and principle of the proposed static-dynamic hybrid wireless charging system with short-segmented coils at traffic lights are introduced. Secondly, the general circuit model of the static-dynamic hybrid wireless charging system with multi-coupling between the primary and secondary sides is developed. The design method of the compensation circuit in primary side based on the number and the positions of the energized primary coils is investigated. After analyzing the characteristics of the system varying with the position of the single load, the control conceptions of the energizing mode alternating in primary side and the combination of the primary compensation capacitors are put forward. Then the power stabilization control strategy of the static-dynamic hybrid wireless charging system with multi short-segmented coils and multi loads is proposed. Finally, the theoretical analyses are verified with the experiments.

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Section: System Descriptionmentioning

confidence: 99%

Power Stabilization based on Switching Control of Segmented Transmitting Coils for Multi Loads in Static-Dynamic Hybrid Wireless Charging System at Traffic Lights

et al. 2019

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“…Wireless electric vehicle charging (WEVC) is gaining worldwide attention and developing very quickly [1][2][3]. Compared to the conductive charging method, WEVC eliminates the bulky cables, the requirement of a manual connection, and the associated hazards.…”

Section: Introductionmentioning

confidence: 99%

“…WEVC exhibits many attractive advantages such as convenience, safety and weatherproofing. Both inductive power transfer (IPT) and capacitive power transfer (CPT) can be used for WEVC [3]. This paper is focused on the IPT system.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Positioning Technique Integrated with Near-Field Communication for Wireless EV Charging

et al. 2020

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For wireless electric vehicle charging, the relative position of the primary and secondary coils has significant impacts on the transferred power, efficiency and leakage magnetic flux. In this paper, a magnetic positioning method using simultaneous power and data transmission (SWPDT) is proposed for power coil alignment. Four signal coils are installed on the primary coil to detect the secondary coil position. By measuring the positioning signal amplitudes from the four signal coils, the power coil relative position can be obtained. Moreover, all the communication needed in the positioning process can be satisfied well by SWPDT technology, and no extra radio frequency (RF) communication hardware is needed. The proposed positioning method can work properly both in power transfer online condition and in power transfer offline condition. Thus, a highly integrated wireless charging system is achieved, which features simultaneous power transfer, data transmission and position detection. A positioning experimental setup is built to verify the proposed method. The experimental results demonstrate that the positioning resolution can be maintained no lower than 1 cm in a 1060 mm × 900 mm elliptical region for a pair of 510 mm × 410 mm rectangular power coils. The three-dimensional positioning accuracy achieves up to 1 cm. Accordingly, the extra hardware cost and control cost for the misalignment tolerance improvement can be reduced. Therefore, for a commercialized wireless EV charger, the cost of improving position detection accuracy and the cost of improving misalignment tolerance should be traded off.Some position detection methods available on the market have been considered for WEVC, such as radio frequency (RF) positioning [14][15][16][17][18][19][20], optical positioning [21,22] and acoustical positioning [23]. However, RF positioning and acoustical positioning both suffer signal multipath impairment and non-line-of-sight impairment when they work in a complex environment. The optical positioning methods, including visual image analysis and infrared positioning, are susceptible to obstacles, dust and harsh weather. Meanwhile, all the methods above are limited by their high cost and difficulty in integrating with the power pads. Magnetoresistive (MR) sensors are investigated to be used for coil misalignment detection [24][25][26][27], but this method has not achieved precise three-dimensional (3D) coordinate output, and plenty of sensors involved in the sensor matrix greatly increase the system cost and complexity. Moreover, some magnetic positioning methods are proposed in [28][29][30][31][32][33], which utilize auxiliary coils to measure the magnetic field generated by the primary power coil. The magnetic positioning methods are of high accuracy, low cost, not susceptible to the environment and are easy to integrate with power pads. In [28][29][30][31][32][33], the primary power coil needs to generate a very weak magnetic field for positioning. Thus, the primary resonant tank is excited by a very low-voltage source...

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“…In recent years, there have also been significant advances in the use of radio frequency (RF) signals as a source of energy scavenging. Although initial experimental measurements showed that the actual strengths of the received electric fields were significant only when the distances between the transmitters and the receivers are rather short [2], current technological developments (both in terms of harvesting hardware and system features) allow for effectively taking advantage of RF energy harvesting in new scenarios [4]. In fact, this is a trend that is being adopted in the design of current and future networks based on short distances (e.g., femtocells [5]).…”

Section: Introductionmentioning

confidence: 99%

User grouping and resource allocation in multiuser MIMO systems under SWIPT

Rubio

Pascual‐Iserte

2019

J Wireless Com Network

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This paper considers a broadcast multiple-input multiple-output (MIMO) network with multiple users and simultaneous wireless information and power transfer (SWIPT). In this scenario, it is assumed that some users are able to harvest power from radio frequency (RF) signals to recharge batteries through wireless power transfer from the transmitter, while others are served simultaneously with data transmission. The criterion driving the optimization and design of the system is based on the weighted sum rate for the users being served with data. At the same time, constraints stating minimum per-user harvested powers are included in the optimization problem. This paper derives the structure of the optimal transmit covariance matrices in the case where both types of users are present simultaneously in the network, particularizing the results to the cases where either only harvesting nodes or only information users are to be served. The trade-off between the achieved weighted sum rate and the powers harvested by the user terminals is analyzed and evaluated using the rate-power (R-P) region. Finally, we propose a two-stage user grouping mechanism that decides which users should be scheduled to receive information and which users should be configured to harvest energy from the RF signals in each particular scheduling period, this being one of the main contributions of this paper.

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Wireless Power Transfer—An Overview

Cited by 1,214 publications

References 108 publications

Power Stabilization based on Switching Control of Segmented Transmitting Coils for Multi Loads in Static-Dynamic Hybrid Wireless Charging System at Traffic Lights

Power Stabilization based on Switching Control of Segmented Transmitting Coils for Multi Loads in Static-Dynamic Hybrid Wireless Charging System at Traffic Lights

Magnetic Positioning Technique Integrated with Near-Field Communication for Wireless EV Charging

User grouping and resource allocation in multiuser MIMO systems under SWIPT

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