scholarly journals Resonance-filtering combo system for continuous wireless charging range coverage

2020 ◽  
Vol 7 (2) ◽  
pp. 116-125
Author(s):  
Üstün Sağlam ◽  
Ahmet Tekin
Keyword(s):  
Low Frequency ◽  
Total Power ◽  
Receiver Coil ◽  
Wireless Charging ◽  
Wireless Power ◽  
End User ◽  
Large Area ◽  
Series Resonance ◽  
Small Form Factor ◽  
Coil Size

AbstractDistribution of wireless power charging field uniformly on a large area pad is critical for power receivers, particularly for wearable devices, wherein small form factor coils are involved. Since the receiver coil size is quite limited in these types of applications, the device is very sensitive to the amount of field it could retain and hence, it needs special placement or snapping mechanism to fix it at an optimum location for reliable wireless charging. In order to overcome this limitation for the end-user, a dual-mode multi-coil power transceiver system is proposed; utilizing resonance filtering to increase the amount of total power delivered with the rather uniform spatial distribution. Two concentric coils; center one driven by 6.78-MHz high-frequency driver (A4WP) and the outer larger one with a 200-KHz low-frequency driver (Qi) with resonant blocker could transfer up to 50 mW standards compliant flat power to a 13-mm radius 30-turns wearable receiver coil everywhere across an 8-cm radius charging pad area without any alignment requirement or snapping. Two different feedback topologies corresponding to each of the H-Bridge power drivers were also presented as an automatic series resonance coil drive frequency lock mechanism, extracting peak powers for each system individually from a standard 5 V-1A USB wall charger.

scholarly journals Effect of Coil Structure on the Efficiency of Wireless Power Transfer System

2019 ◽  
Vol 9 (2) ◽  
pp. 3387-3392
Keyword(s):  
Wireless Power Transfer ◽  
Receiver Coil ◽  
Transfer System ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Charging System ◽  
Coil Structure ◽  
Power Transfer Efficiency ◽  
Wireless Power Transfer System

A typical magnetic resonance based wireless power transfer (WPT) system comprises a transmitter coil and an embedded receiver coil used for wireless charging of the electrical and electronics devices. It has been investigated that the coil structure influence the power transfer efficiency of the wireless charging system .The investigations have been carried out in order to determine a suitable coil type and geometry so as to achieve higher efficiency of a wireless power transfer system. The present investigation will afford the design strategy for an efficient wireless charging system .

scholarly journals Effect of Coil Dimensions on Dynamic Wireless Power Transfer for Electric Vehicles

2021 ◽  
Author(s):  
Sahar Bareli ◽  
Lidor Geri ◽  
Yasha Nikulshin ◽  
Oren E. Nahum ◽  
Yuval Hadas ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Coupling Coefficient ◽  
Receiver Coil ◽  
Power Transfer ◽  
Multi Objective Optimization ◽  
Wireless Power ◽  
Simulation Tools ◽  
Power Transfer Efficiency ◽  
Coil Size ◽  
The Magnetic Field

We explore the effects of various receiver coil dimensions and configurations on power transfer efficiency and cost of operation, using advanced simulation tools. We demonstrate that the spatial distribution of the magnetic field leads to a non-monotonic dependence of the coupling coefficient on coil size. Thus, an optimal coil size, where the coupling coefficient peaks, should be regarded a crucial design parameter which affects the entire system performances. The incorporation of our findings into a multi-objective optimization algorithm is also discussed.

scholarly journals A 3D wireless charging cube with externally enhanced magnetic field for extended range of wireless power transfer

2019 ◽  
Vol 6 (1) ◽  
pp. 67-76 ◽  
Author(s):  
Qi Zhu ◽  
Hua Han ◽  
Mei Su ◽  
Aiguo Patrick Hu
Keyword(s):  
Electromotive Force ◽  
Three Dimensional ◽  
Wireless Power Transfer ◽  
Receiver Coil ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Magnetic Cores ◽  
Transfer Capability ◽  
Extended Point

More mobile devices such as mobile phones and robots are wirelessly charged for convenience, simplicity, and safety, and it would be desirable to achieve three-dimensional (3D) wireless charging with high spatial freedom and long range. This paper proposes a 3D wireless charging cube with three orthogonal coils and supporting magnetic cores to enhance the magnetic flux outside the cube. The proposed system is simulated by Ansoft Maxwell and implemented by a downsized prototype. Both simulation and experimental results show that the magnetic cores can strengthen the magnitude of B-field outside the cube. The final prototype demonstrates that the power transfer distance outside the cube for getting the same induced electromotive force in the receiver coil is extended approximately by 50 mm using magnetic cores with a permeability of 2800. It is found that the magnitude of B-field outside the cube can be increased by increasing the width and the permeability of the magnetic cores. The measured results show that when the permeability of the magnetic cores is fixed, the induced electromotive force in the receiver coil at a point 300 mm away from the center of the cube is increased by about 2V when the width of the magnetic cores is increased from 50 to 100 mm. The increase in the induced electromotive force at an extended point implies a greater potential of wireless power transfer capability to the power pickup.

scholarly journals Effect of Coil Dimensions on Dynamic Wireless Power Transfer for Electric Vehicles

2021 ◽  
Author(s):  
Sahar Bareli ◽  
Lidor Geri ◽  
Yasha Nikulshin ◽  
Oren E. Nahum ◽  
Yuval Hadas ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Coupling Coefficient ◽  
Receiver Coil ◽  
Power Transfer ◽  
Multi Objective Optimization ◽  
Wireless Power ◽  
Simulation Tools ◽  
Power Transfer Efficiency ◽  
Coil Size ◽  
The Magnetic Field

We explore the effects of various receiver coil dimensions and configurations on power transfer efficiency and cost of operation, using advanced simulation tools. We demonstrate that the spatial distribution of the magnetic field leads to a non-monotonic dependence of the coupling coefficient on coil size. Thus, an optimal coil size, where the coupling coefficient peaks, should be regarded a crucial design parameter which affects the entire system performances. The incorporation of our findings into a multi-objective optimization algorithm is also discussed.

scholarly journals Improvement of power transfer efficiency of hexagonal coil arrays in misalignment conditions

2021 ◽  
Vol 22 (2) ◽  
pp. 638
Author(s):  
Sianturi Tigor Franky Devano ◽  
Taufik Hidayat ◽  
Mudrik Alaydrus
Keyword(s):  
Boundary Plane ◽  
Transfer Efficiency ◽  
Receiver Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Coil Array ◽  
Single Coil ◽  
Coil Arrays ◽  
Power Transfer Efficiency ◽  
Coil Size

<span>Wireless charging by transferring energy between two objects using electromagnetic fields commonly called Wireless power transfer is an alternative technology that is physically installed in an electric vehicle (EV) to charge. Parking alignment is a very important factor in driver behavior that affects Power transfer efficiency (PTE). The proposed hexagonal coil array design in this experiment is to optimize PTE and receiver coil size. The experimental results show that PTE in the tangential boundary plane Misalignment increases by 5-10% when compared to coil array circles and increases by 82% when compared to single coil circles. </span>

A Low Frequency Wireless Power Transfer Using Parallel Resonance under Impedance Matching

2015 ◽  
Vol 781 ◽  
pp. 410-413 ◽  
Author(s):  
Artit Rittiplang ◽  
Wanchai Pijitrojana
Keyword(s):  
Impedance Matching ◽  
Low Frequency ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Transfer Distance ◽  
Series Resonance ◽  
Parallel Resonance ◽  
Implantable Biomedical Devices

Nowadays, there are more studies about the wireless power transfer (WPT) for mobile charging, electrical vehicles, implantable biomedical devices, and other applications. They (series resonance) commonly operate at high the self-resonant frequency (f0, several hundred kHz - several MHz ranges) based on magnetic coupling under impedance matching (IM). Operating at high f0 to increase the transfer distance, but high f0 (several MHz ranges) causes other parasitic losses of devices and the effectiveness to humans. In this paper, we propose a new method to design WPT using the parallel resonance under IM at low f0. The two coils are 10-turns with the radius of 6.2 cm. The efficiency (35.77 %) of the system under IM is achieved at the transfer distance of 10 cm and f0=20.388 kHz (low frequency), and the transfer distance can be increased by reducing f0.

scholarly journals Transmitter Module Optimization for Wireless Power Transfer Systems with Single Transmitter to Multiple Receivers

Mathematics ◽  
2021 ◽  
Vol 9 (22) ◽  
pp. 2928
Author(s):  
Joungha Lee ◽  
Seung Beop Lee
Keyword(s):  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Total Power ◽  
Receiver Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Load Voltage ◽  
Multiple Receivers ◽  
Power Transfer Efficiency ◽  
Transmitter Coil

Most of the coil designs for wireless power transfer (WPT) systems have been developed based on the “single transmitter to a single receiver (S-S)” WPT systems by the empirical design approaches, partial domain searches, and shape optimization methods. Recently, the layout optimizations of the receiver coil for S-S WPT systems have been developed using gradient-based optimization, fixed-grid (FG) representation, and smooth boundary (SB) representation. In this paper, the new design optimization of the transmitter module for the “single transmitter to multiple receivers (S-M)” WPT system with the resonance optimization for the S-M WPT system is proposed to extremize the total power transfer efficiency while satisfying the load voltage (i.e., rated power) required by each receiver and the total mass used for the transmitter coil. The proposed method was applied to an application model (e.g., S-M WPT systems with two receiver modules). Using the sensitivity of design variables with respect to the objective function (i.e., total power transfer efficiency) and constraint functions (i.e., load voltage of each receiver module and transmitter coil mass) at each iteration of the optimization process, the proposed method determines the optimal transmitter module that can maximize the total power transfer efficiency while several constraints are satisfied. Finally, the optimized transmitter module for the S-M WPT system was demonstrated through comparison with experiments under the same conditions as the simulation environment.

scholarly journals Application of wireless power transfer technologies and intermittent energy harvesting for wireless sensors in rotating machines

2016 ◽  
Vol 3 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Qingfeng Xia ◽  
Longyang Yan
Keyword(s):  
Wireless Sensors ◽  
Wireless Power Transfer ◽  
Sensor Nodes ◽  
Receiver Coil ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Rotating Machines ◽  
Battery Capacity ◽  
Transmitter Coil

Battery-powered wireless sensor networks have been extensively deployed in condition monitoring and structural health monitoring systems, but the performance of wireless sensors are limited by battery capacity and difficulty of application in rotating machines. In this paper, a variety of commercial wireless charging solutions and coil-shaft configurations for magnetic coupling are compared, having in mind of the application of continuously charging wireless sensors on rotating machines. For the co-axial configuration of the transmitter coil and the receiver coil, a Qi standard compliant wireless charging kit and a custom charging circuit are successfully applied to charge wireless sensors on small rotating test rigs. In order to harvest and store intermittent energy input from the wireless power source, a prototype receiver circuit using a supercapacitor and low-dropout regulator is designed and validated. Based on the prototype circuit, the radial configuration of single transmitter coil and multiple receiver coils is demonstrated for wireless power transfer to the sensor nodes on the drivetrain of a small wind turbine test rig.

scholarly journals Intrinsic Properties of Metamaterial Slab in Wireless Power Transfer for Efficiency Improvement of Wireless Communication Systems

2018 ◽  
Vol 8 (01) ◽  
Author(s):  
Abdul Syed ◽  
Kanti Prasad
Keyword(s):  
Communication Systems ◽  
Low Frequency ◽  
Wireless Power Transfer ◽  
Ring Resonators ◽  
Receiver Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Intrinsic Properties ◽  
Transmission Coefficients ◽  
Unit Cell Size

Metamaterial (MTM) slabs, realized using Split Ring Resonators (SRR’s) to enhance efficiency of Wireless Power Transfer (WPT) systems is discussed here. A detailed study of intrinsic properties obtained by simulation of the actual MTM slab is presented. An improvement in the wavelength to unit cell size of 813, at a low operating frequency of 5680 kHz is shown. Forward transmission coefficients (S₂₁) for with and without MTM slab cases are compared. In this low frequency regime, with simulated S-parameters an efficiency of ~ 68% is achieved by placing the MTM slab closer to receiver coil than the transmitter coil.

Scaling Law of Coupling Coefficient and Coil Size in Wireless Power Transfer Design via Magnetic Coupling

2017 ◽  
Vol 137 (4) ◽  
pp. 326-333
Author(s):  
Chiaki Nagai ◽  
Kenji Inukai ◽  
Masato Kobayashi ◽  
Tatsuya Tanaka ◽  
Kensho Abumi ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Scaling Law ◽  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Coil Size
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