Query: Design of a wireless power transfer system for assisted living applications

Candidate papers:

abstract: 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 x 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.
author_names: Qassim Abdullahi

Rahil Joshi

Symon K Podilchak

Sadeque Reza Khan

Meixuan Chen

Jean Rooney

Danmei Sun

Marc P Y Desmulliez

Apostolos T Georgiadis

Dimitris E Anagnostou
title: Design of a wireless power transfer system for assisted living applications
venue: Wireless Power Transfer
year: 2019

abstract: The design of wearable sensors and development of novel wireless radio protocols drive advances in the assisted living technology which is a promising approach in terms of future domestic healthcare. In this paper we propose the system architecture for vital signs monitoring in home conditions. The prototype device is based on the microcontroller supporting Bluetooth Low Energy which may be used for medical data transfer in assisted living applications. We developed a respiration rate sensor and thermometer pickup to provide basic measurements of physiological signals. We tested a range of proposed wireless system in urban conditions. The temperature and respiration rate was then recorded to verify the system operation. We measured the power consumption to evaluate the low energy performance of the device which is vital aspect of the telemedical wearable system.
author_names: Marcin Kajor

Dominik Grochala

Michal Grochala

Marek Iwaniec

Justyna Agnieszka Lemejda
title: Assisted Living System Architecture Based on Bluetooth low Energy and Wearable Sensors
venue: 2020 IEEE XVIth International Conference on the Perspective Technologies and Methods in MEMS Design (MEMSTECH)
year: 2020

abstract: Abstract. Wireless Power Transfer (WPT) with simultaneous data transmission through coupled magnetic resonators is investigated in this paper. The development of this system is dedicated to serve as a basis for applications in the field of Ambient Assisted Living (AAL) for example tracking vital parameters remotely, charge and control sensors and so on. Due to these different scenarios we consider, it is important to have a system which is reliable under the circumstance of changing positioning of the receiving device. State of the art radio systems would be able to handle this. Nevertheless, energy harvesting from far field sources is not sufficient to power the devices additionally on mid range distances. For this reason, coupled magnetic resonant circuits are proposed as a promising alternative, although suffering from more complex positioning dependency. Based on measurements on a simple prototype system, an equivalent circuit description is used to model the transmission system dependent on different transmission distances and impedance matching conditions. Additionally, the simulation model is used to extract system parameters such as coupling coefficients, coil resistance and self capacitance, which cannot be calculated in a simple and reliable way. Furthermore, a mathematical channel model based on the schematic model has been built in MATLAB(c) It is used to point out the problems occurring in a transmission system with variable transmission distance, especially the change of the passband's centre frequency and its bandwidth. Existing solutions dealing with this distance dependent behaviour, namely the change of the transmission frequency dependent on distance and the addition of losses to the resonators to increase the bandwidth, are considered as not inventive. First, changing the transmission frequency increases the complexity in the data transmission system and would use a disproportional total bandwidth compared to the actually available bandwidth. Additionally, adding losses causes a decrease in the energy transmission efficiency. Based on these facts, we consider a system that changes the channel itself by tuning the resonant coils in a way that the passband is always at a fixed frequency. This would overcome the previously described issues, and additionally could allow for the possibility to run several independent transmission systems in parallel without disturbing each other.
author_names: Christian Schmidt

E Lloret Fuentes

Martin Buchholz
title: Investigations and system design for simultaneous energy and data transmission through inductively coupled resonances
year: 2015

abstract: In high power applications of wireless power transfer systems as Maglev, both a high transferred power and a high e ciency are essential. However, these two requirements usually show dissimilar proflles over a range of operating conditions. Magnetic and electric models for a capacitor compensated system are used to analyze the problem. Using the analysis outcome, a compromise is made to come to an acceptable design achieving both requirements. In particular, appropriate design parameters and resonance frequency are obtained. The analytical results are conflrmed by 3D FEM analysis.
author_names: Saeed Hasanzadeh

Sadegh Vaez-Zadeh
title: DESIGN OF A WIRELESS POWER TRANSFER SYSTEM FOR HIGH POWER MOVING APPLICATIONS
year: 2013

abstract: Abstract In this study, a 15 kW wireless power transfer system with high frequency and large air gap for electrical vehicle battery charge systems is designed and co simulations with ANSYS Maxwell and Simplorer software are performed. The air gap between the primary and the secondary windings are determined as 20 cm for the 15 kW wireless power transfer system. Operation of the designed system for different operation conditions such as completely aligned windings (ideal condition) and windings with alignment errors, which can occur because of user error or another reason, are analyzed and obtained results are reported. The resonant frequency of the designed system which has a 60 x 60 cm secondary winding and a 60 x 100 cm primary winding is 17.702 kHz, and the maximum efficiency of the system is obtained as 75.38% for completely aligned windings. The distribution and density of the electromagnetic flux, and variation of efficiency versus load level of the system and responses of the system in case of different alignment errors are also investigated and reported for both ideal operation conditions and in case of alignment errors.
author_names: Sakir Kuzey

Selami Balci

Necmi Altin
title: Design and analysis of a wireless power transfer system with alignment errors for electrical vehicle applications
year: 2017

abstract: In this paper, we develop an analytical framework for the statistical analysis of the battery recharging time (BRT) in reconfigurable intelligent surfaces (RISs) aided wireless power transfer (WPT) systems. Specifically, we derive novel closed form expressions for the probability density function (PDF) cumulative distribution function, and moments of the BRT of the radio frequency energy harvesting wireless nodes. Moreover, closed form expressions of the the PDF of the BRT is obtained for two special cases: i) when the RIS is equipped with one reflecting element (RE) ii) when the RIS consists of a large number of REs. Capitalizing on the derived expressions, we offer a comprehensive treatment for the statistical characterization of the BRT and study the impact of the system and battery parameters on its performance. Our results reveal that the proposed statistical models are analytically tractable, accurate, and efficient in assessing the sustainability of RIS assisted WPT networks and in providing key design insights for large scale future wireless applications. For example, we demonstrate that a 4 fold reduction in the mean time of the BRT can be achieved by doubling the number of RIS elements. Monte Carlo simulation results corroborate the accuracy of the proposed theoretical framework.
author_names: Lina S Mohjazi

Sami Hakam Muhaidat

Qammer Hussain Abbasi

Muhammad Ali Imran

Octavia A Dobre

Marco di Renzo
title: Battery Recharging Time Models for Reconfigurable Intelligent Surface Assisted Wireless Power Transfer Systems
venue: ArXiv
year: 2020

abstract: This paper analyses the factors influencing wireless power transfer system efficiency for electric vehicle application. Due to complexity in the wireless power transfer transformers, a Finite Element Analysis (FEA) is the key to facilitate the calculation of the mutual inductance and the coupling coefficient. A circular coil transformer model is modelled and simulated in Ansys Maxwell software under different conditions. Simulation results are performed and analyzed. An introduction to WPT transformer model is also presented.
author_names: Tasnime Bouanou

Hassan El Fadil

Abdellah Lassioui
title: Analysis and Design of Circular Coil Transformer in a Wireless Power Transfer System for Electric Vehicle Charging Application
venue: 2020 International Conference on Electrical and Information Technologies (ICEIT)
year: 2020

abstract: The analysis and design of wireless power transmission coils for satellite on board application are presented. Firstly, application background and design constrain are presented. Different factors affecting the coupling coefficient are analysed, and transmission cores fitting satellite application are designed and optimised. To reduce magnetic flux leakage and to improve transmission efficiency, ways to reduce magnetic flux leakage are analysed. According to the requirement of the system, suitable leakage reduction design is chosen, and different materials are simulated. Combining optimised transmission core design and magnetic flux leakage reduction design, a model fitting in required application is presented and simulated. Result shows the fitness of application requirement.
author_names: Feng Wang

Xueqin Chen
title: Design and optimisation of a wireless power transfer system for satellite application
venue: IET Power Electronics
year: 2019

abstract: In order to solve the problem of low efficiency and short transmitting distance of WPT in implantable medical applications, this paper presents a WPT system with switchable match network. The main coupling mechanism is analyzed, which is a novel 2 coil system with 90mm outer diameter of primary spider web coil and 65mm outer diameter of secondary spider web coil. Meanwhile, the range of load impedance is calculated to ensure the Pi match network. Related simulation and experiments are carried out and the results show that at 6.78MHz frequency, the proposed system could achieve up to 180mm transmitting distance, a constant output 16.8V voltage with transmitting efficiency up to 78% through the switch able Pi match network.
author_names: Ying Liu

Yang Li

Jiantao Zhang

Shuai Dong

Chao Cui

Chunbo Zhu
title: Design a Wireless Power Transfer System with Variable Gap Applied to Left Ventricular Assist Devices
venue: 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (Wow)
year: 2018

abstract: Wireless power transfer (WPT) has been a very popular topic of research recently. In most research the coil design is based on the classical theory and the parameters of the coils are obtained by calculations or direct measurements. However, the method has its limitation when the shape and structure of the coil is complex or the coil hasn't been constructed. The purpose of this paper is to present the whole process of designing coils and building a wireless power transfer system with the finite element analysis (FEA) and with MATLAB simulation in detail. Finally the experimental results will be presented to verify the validity and reasonability of the design method.
author_names: Ran Chang

Li Quan

Xiaoyong Zhu

Zaiyun Zong

Huawei Zhou
title: Design of a wireless power transfer system for EV application based on finite element analysis and MATLAB simulation
venue: 2014 IEEE Conference and Expo Transportation Electrification Asia Pacific (ITEC Asia Pacific)
year: 2014