scholarly journals Design of a Wireless Charging System for e-Scooter

2021 ◽  
Vol 27 (2) ◽  
pp. 40-48
Author(s):  
Jakub Skorvaga ◽  
Michal Frivaldsky ◽  
Miroslav Pavelek
Keyword(s):  
Power Converter ◽  
Mutual Distance ◽  
Wireless Charging ◽  
Wireless Power ◽  
Charging System ◽  
Power Characteristics ◽  
Operational Characteristics ◽  
Practical Evaluation ◽  
Circuit Components ◽  
Adequate Design

This article deals with the design and practical evaluation of a wireless charging system for e-scooters. As wireless charging undertakes popularity, initially, the state of the art within application area is realized. Consequently, due to variability of the configuration of the whole system, several alternatives are discussed considering the utilization of the power converter stages. High attention is given to the construction of the coupling elements and calculation of the main circuit components of the considered power converters. The experimental part of the paper is supported by the measurements of key properties, i.e., the operational characteristics of the whole converter system together with coupling coils. Here, the efficiency characteristics, together with the output power characteristics in dependency on the mutual distance between the transmitting and receiving coils, are evaluated. Received results represent an adequate design approach and practical use of the proposed Wireless Power Transfer (WPT) e-scooter charging configuration.

scholarly journals Design of a wireless power transfer system for assisted living applications

2019 ◽  
Vol 6 (1) ◽  
pp. 41-56 ◽  
Author(s):  
Qassim S. Abdullahi ◽  
Rahil Joshi ◽  
Symon K. Podilchak ◽  
Sadeque R. Khan ◽  
Meixuan Chen ◽  
...  
Keyword(s):  
Assisted Living ◽  
Performance Indicator ◽  
The Elderly ◽  
Consumer Electronics ◽  
Electronic Systems ◽  
Wireless Charging ◽  
Power Transfer ◽  
Electronic Textiles ◽  
Wireless Power ◽  
Charging System

Advances in material science and semiconductor technology have enabled a variety of inventions to be implemented in electronic systems and devices used in the medical, telecommunications, and consumer electronics sectors. In this paper, a wireless charging system is described as a wearable body heater that uses a chair as a transmitter (Tx). This system incorporates the widely accepted Qi wireless charging standard. Alignment conditions of a linear three-element coil arrangement and a 3 × 3 coil matrix array are investigated using voltage induced in a coil as a performance indicator. The efficiency obtained is demonstrated to be up to 80% for a voltage of over 6.5 Volts and a power transfer of over 5 Watts. Our results and proposed approach can be useful for many applications. This is because the wireless charging system described herein can help design seating areas for the elderly and disabled, commercial systems, consumer electronics, medical devices, electronic textiles (e-textiles), and other electronic systems and devices.

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 .

Using Sensing Coils to Detect and Correct Lateral Misalignments in an Inductive Power-Transfer Wireless Charging System

2017 ◽  
Author(s):  
Ivan Cortes ◽  
Won-jong Kim
Keyword(s):  
Consumer Products ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Inductive Power Transfer ◽  
Charging System ◽  
Field Symmetry ◽  
Electrical Transformers ◽  
Efficient Power ◽  
Inductive Power

Inductive power transfer (IPT) remains one of the most common ways to achieve wireless power transfer (WPT), operating on the same electromagnetic principle as electrical transformers but with an air core. IPT has recently been implemented in wireless charging of consumer products such as smartphones and electric vehicles. However, one major challenge with using IPT remains ensuring precise alignment between the transmitting and receiving coils so that maximum power transfer can take place. In this paper, the use of additional sensing coils to detect and correct lateral misalignments in an IPT systems is modeled and tested. The sensing coils exploit magnetic-field symmetry to give a nonlinear measure of misalignment direction and magnitude. Experiments using such sensing coils give a misalignment-sensing resolution of less than 1 mm when applied to a common smartphone wireless charging system. Voltage readings from the sensing coils are used for feedback control of an experimental two-dimensional coil positioner. This system is able to reduce lateral misalignments to less than 2 mm in real time, allowing for efficient power transfer. The results of this experiment give confidence that similar sensing coils can be used to reduce lateral misalignments in scaled IPT systems, such as electric-vehicle wireless chargers.

scholarly journals Influence of Asymmetric Coil Parameters on the Output Power Characteristics of Wireless Power Transfer Systems and Their Applications

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1212
Author(s):  
Zhipeng Guan ◽  
Bo Zhang ◽  
Dongyuan Qiu
Keyword(s):  
Output Power ◽  
Lithium Ion ◽  
Wireless Power Transfer ◽  
Power Splitting ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Asymmetric System ◽  
Power Characteristics ◽  
Portable Power

Nowadays, it is a trend to update electronic products by replacing the traditional wire charging with emerging wireless charging. However, other features of the products must generally be left unchanged, which limits the options in receiving coil design. As a result, asymmetric coil designs should be adopted in wireless charging systems. In this paper, a wireless power transfer system with asymmetric transmitting and receiving coils is modelled using circuit theory. The output power of the asymmetric system is analyzed, and the conditions of the maximum power splitting phenomenon are addressed in detail. Cases for different resonant frequency conditions are elaborated. The splitting frequencies and critical coupling coefficient are obtained, which are different and more complicated compared with the symmetric counterparts. Asymmetric coil designs can be adopted based on the proposed method, so that adequate and efficient output power transfer can be realized. Finally, the asymmetric coils design is utilized in an experimental prototype in order to contactlessly charge a portable power tool lithium-ion battery pack with 18 V DC and 56 W output through 220 V AC input, without altering its original configuration, and the correctness of proposed analysis can thus be verified.

scholarly journals Stability Improvement of Dynamic EV Wireless Charging System with Receiver-Side Control Considering Coupling Disturbance

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1639
Author(s):  
Kaiwen Chen ◽  
Ka Wai Eric Cheng ◽  
Yun Yang ◽  
Jianfei F. Pan
Keyword(s):  
Feedforward Control ◽  
Mutual Inductance ◽  
System Stability ◽  
Wireless Charging ◽  
Receiver Side ◽  
Wireless Power ◽  
Signal Model ◽  
Charging System ◽  
Steady State Operation ◽  
Communication Time

Receiver-side control has been a reliable practice for regulating the transferred energy to the batteries in the electric vehicle (EV) wireless power transfer (WPT) systems. Nonetheless, the unpredictable fluctuation of the mutual inductance in dynamic wireless charging brings extreme instability to the charging process. This overshoot that appears in instant vibrations may largely increase the voltage/current stress of the system, and even cause catastrophic failure in the battery load. In addition, the speed of the vehicles may lead to untraceable steady-state operation. However, existing solutions to the above two issues suffer from either long communication time delay or significantly compromised output regulation. In this paper, the slow dynamics and the overshoot issues of the WPT system are elaborated in theory, and the small-signal model mainly considering mutual inductance disturbance is established. A simple feedforward control is proposed for overshoot damping and fast system dynamics. Experimental results validate that the overshoot can be reduced by 13% and the settling time is improved by 50% in vehicle braking or acceleration. In constant speed driving, the battery charging ripple is decreased by 12% and ensures better system stability.

scholarly journals On the Asymptotic Behavior and Parameter Estimation of a Double-Sided LCC-Compensated Wireless Power Transfer System

Machines ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 287
Author(s):  
Feng-Rung Hu ◽  
Jia-Sheng Hu
Keyword(s):  
Parameter Estimation ◽  
Wireless Power Transfer ◽  
Circuit Model ◽  
Current Status ◽  
Transfer System ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Charging System ◽  
Wireless Power Transfer System

This study investigates the statistic behavior and parameter estimation problems of a double-sided, LCC-compensated, wireless power transfer system. Based on the commonly used wireless charging circuit model, this study proposes a five-step parameter estimation method, which is applicable to automotive static wireless charging systems. The eight parameters in the circuit model of this study are the most important key components of the wireless charging system. The study also found that, under certain conditions, the statistic mode of wireless charging systems has a specific distribution. However, the current status of these eight components for wireless charging of electric vehicles will have complex parameter drift problems. These drift problems will deteriorate the performance of the vehicle power systems. This study probes these factors and proposes some related mathematical theories. The noted factors can be applied to the analysis of the wireless charging system and provide alternative solutions to explain the deteriorations from coil misalignments. Both simulations and experiments are given to show the evaluated issues of the proposed study.

scholarly journals Voltage Stress Reduction on Compensation Capacitors of Wireless Charging Systems for Transport and Industrial Infrastructure

2019 ◽  
Vol 21 (2) ◽  
pp. 50-57
Author(s):  
Miroslav Pavelek ◽  
Pavol Spanik ◽  
Michal Frivaldsky
Keyword(s):  
Stress Reduction ◽  
Simulation Analysis ◽  
Wireless Charging ◽  
Wireless Power ◽  
Practical Utilization ◽  
Component Selection ◽  
Current Trends ◽  
Operational Characteristics ◽  
Critical Issues ◽  
Circuit Configuration

The paper deals with a proposal for circuit configuration of series-series (SS) compensated wireless power transfer (WPT) system with reduced voltage stresses on compensation capacitors. Nowadays, a huge effort is given for the development of reliable, efficient and robust wireless charging systems and therefore the circuit configuration and component selection are crucial to meet suitable operational characteristics. For this purpose, the current trends in WPT systems are outlined in the first section. Next, the analysis of frequently utilized WPT system configuration is provided and the most critical issues related to practical utilization are discussed. Consequently, the proposal of how to eliminate negative aspects is given. All theoretical statements are supported by mathematical apparatus of the proposed system and consequently by the simulation analysis.

scholarly journals Constant-Current and Constant-Voltage Output for Single-Switch WPT System with Composite Shielding Structure

2021 ◽  
Vol 13 (1) ◽  
pp. 13
Author(s):  
Quanlei Zhang ◽  
Chunfang Wang ◽  
Lingyun Yang ◽  
Zhihao Guo
Keyword(s):  
Shielding Effect ◽  
Constant Current ◽  
Maximum Efficiency ◽  
Wireless Charging ◽  
Constant Voltage ◽  
Wireless Power ◽  
Zero Voltage Switching ◽  
Charging System ◽  
The Stability ◽  
Zero Voltage

With the development of wireless power transfer (WPT), the wireless charging has become a research hotspot. This paper proposes a novel single-switch hybrid compensation topology, which can change the compensation network to realize the constant-current (CC) and constant-voltage (CV) output. The zero voltage switching (ZVS) margin can be designed to increase the stability of the system. In addition, the magnetic coupler adopts a composite shielding structure composed of ferrite, nanocrystalline, and aluminium foil. The composite shielding structure has a better shielding effect on magnetic flux leakage, and its weight is lighter. The composite shielding structure is expected to be used in the wireless charging system of electric vehicles (EVs). Finally, an experimental prototype is built to verify the theoretical analysis, and the maximum efficiency can reach 91.4%.

Wireless Charging System for Electric Vehicles

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
K. Paramesh ◽  
R.P. Neriya ◽  
M.V. Kumar
Keyword(s):  
Electric Vehicles ◽  
Power Transmission ◽  
Wireless Transmission ◽  
Electric Load ◽  
Wireless Charging ◽  
Electrical Load ◽  
Wireless Power ◽  
Charging System ◽  
Electrical Devices ◽  
Resonance Coupling

Wireless power transmission (WPT) is popular and gaining technology finding its application in various fields. The power is transferred from a source to an electrical load without the need of interconnections. WPT is useful to power electrical devices where physical wiring is not possible or inconvenient. The technology uses the principle of mutual inductance. One of the future applications finds in automotive sector especially in Electric Vehicles. This paper deals with research and development of wireless charging systems for Electric vehicles using wireless transmission. The main goal is to transmit power using resonance coupling and to build the charging systems. The systems deal with an AC source, transmission coil, reception coil, converter and electric load which are battery.

scholarly journals A Multi-Tone Rectenna System for Wireless Power Transfer

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2374
Author(s):  
Simone Ciccia ◽  
Alberto Scionti ◽  
Giuseppe Franco ◽  
Giorgio Giordanengo ◽  
Olivier Terzo ◽  
...  
Keyword(s):  
Wireless Power Transfer ◽  
Directional Antennas ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Major Drawback ◽  
Charging System ◽  
Radiated Power ◽  
Novel Method ◽  
Charging Mechanism

Battery-less sensors need a fast and stable wireless charging mechanism to ensure that they are being correctly activated and properly working. The major drawback of state-of-the-art wireless power transfer solutions stands in the maximum Equivalent Isotropic Radiated Power (EIRP) established from local regulations, even using directional antennas. Indeed, the maximum transferred power to the load is limited, making the charging process slow. To overcome such limitation, a novel method for implementing an effective wireless charging system is described. The proposed solution is designed to guarantee many independent charging contributions, i.e., multiple tones are used to distribute power along transmitted carriers. The proposed rectenna system is composed by a set of narrow-band rectifiers resonating at specific target frequencies, while combining at DC. Such orthogonal frequency schema, providing independent charging contributions, is not affected by the phase shift of incident signals (i.e., each carrier is independently rectified). The design of the proposed wireless-powered system is presented. The main advantage of the solution is the voltage delivered to the load, which is directly proportional to the number of used carriers. This is fundamental to ensure fast sensor wakes-up and functioning. To demonstrate the feasibility of the proposed system, the work has been complemented with the manufacturing of two rectennas, and the analysis of experimental results, which also validated the linear relationship between the number of used carriers.

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