scholarly journals Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1244
Author(s):  
Ghada Bouattour ◽  
Mohamed Elhawy ◽  
Slim Naifar ◽  
Christian Viehweger ◽  
Houda Ben Jmaa Derbel ◽  
...  
Keyword(s):  
Power Transmission ◽  
The Novel ◽  
Wireless Power ◽  
Single Output ◽  
Novel Approach ◽  
Single Coil ◽  
Communication Module ◽  
Wireless Power Transfer System ◽  
Receiving Coil ◽  
Secondary Side

Multi-input single output wireless power transmission (MISO-WPT) systems have decisive advantages concerning flexible receiver position in comparison to single coil systems. However, the supply of the primary side brings a large uncertainty in case of variable positions of the secondary side. In this paper, a compact multiplexed primary side electronic circuit is proposed, which includes only one signal generator, a passive peak detector, a communication module, and a compensation capacitor. The novel approach has been studied and evaluated for a MISO-WPT system having a 16 coils on primary side and one coil on secondary side having the double diameter. Results show that a standard microcontroller, in this case an STM32, is sufficient for the control of the whole system, so that the costs and the energy consumption are significantly reduced. An activation strategy has been proposed, which allows to determine the optimal transmitting coil for each position of the receiving coil and to switch it on. The time-to-start-charging at different positions of the receiving coil and different number of neighbors has been determined. It remains in all cases under 2.5 s.

scholarly journals Comparative Analysis of Coil Structures and Orientations of Single Transmitter and Multi Receivers Wireless Power Transfer System

2021 ◽  
Vol 309 ◽  
pp. 01118
Author(s):  
CH Jagadeesh ◽  
Phaneendra Babu Bobba
Keyword(s):  
Control Systems ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Maglev Train ◽  
Long Distance ◽  
Strongly Coupled ◽  
Multiple Loads ◽  
Single Coil ◽  
Wireless Power Transfer System

Single transmitter and multi receiver (STMR) based WPT system is used to power multiple loads at a time. It consists of some limitations like long distance power transfer, mutual inductance between receiver coils and misalignment of receiver coils. this paper is going to give a detailed information about different designs of STMR, which are going to overcome the limitations of STMR. Different designs proposed by different authors are wireless power repeater system with single coil in each repeater, wireless power repeater system with two coils in each repeater, spherical strongly coupled magnetic resonant, square shape coils, maglev train IPT system and cube shaped unidirectional flux transmitter type. The above-mentioned designs are analysed and concluded a best design from it, depending up on applications and discussed about the control systems used in STMR.

A Novel Approach for Supplying Wireless Energy to Multiple Devices Simultaneously Using Sweeping Effect

2014 ◽  
pp. 43-58
Author(s):  
Askin Erdem Gundogdu ◽  
Erkan Afacan
Keyword(s):  
Energy Efficiency ◽  
High Efficiency ◽  
Power Transmission ◽  
Transmission Range ◽  
Transfer System ◽  
Wireless Power ◽  
Efficiency Loss ◽  
Novel Approach ◽  
Multiple Devices ◽  
Sweeping Effect

There has been great interest in wireless power transmission since 2007 when a novel approach was presented by a group of scientists at MIT. With this new technique, power transmission range is possible for a couple of meters with high efficiency; however, to be able to use this technique in our lives with high efficiency and long transfer range, small structured devices and new design techniques are strongly required. In this chapter, the investigation on supplying energy by sweeping was presented. The experimental results claim that energy could be supplied to multiple devices almost at the same time. If the range of chosen frequency increases, the number of devices could be increased as well, considering slight energy efficiency loss in the transfer system. The authors hope that the proposed technique gives inspiration to the designers and to the market.

scholarly journals Optimization Design for Receiving Coil with Novel Structure Based on Mutual Coupling Model in Wireless Power Transmission for Capsule Endoscope

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6460
Author(s):  
Shuai Kuang ◽  
Guozheng Yan ◽  
Zhiwu Wang
Keyword(s):  
Optimization Design ◽  
Power Transmission ◽  
Biological Tissues ◽  
Mutual Inductance ◽  
Power Measurement ◽  
Capsule Endoscope ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Sufficient Power ◽  
Receiving Coil

Wireless capsule endoscope (WCE) is a promising technology for noninvasive and painless imaging detection on gastrointestinal (GI) diseases. On the other hand, conventional endoscopes with wires could discomfort patients and cause them to vomit and aerosolize coronavirus if the patients are infected with COVID-19. However, there stands a technical bottleneck on power supply for the WCE. With the help of wireless power transmission technology, a hollow receiving coil (RC) is proposed to supply sufficient power and also minimize the size of WCE. A model on mutual inductance between transmitting and receiving coils is proposed to evaluate receiving power when the RC is in a different position and direction of patient’s GI tract. Based on the model, an optimal RC is built to obtain sufficient and stable power. Measurement of mutual inductance with the optimal RC validates high accuracy of the proposed model. The standard deviation of receiving power is very low. WCE with optimum RC gets sufficient power and captures images stably in live pig’s intestine tract. Additionally, the model is little affected by biological tissues. It ensures reliable performance of WCE and makes popular clinical application of WCE possible, which is also a relief to reduce epidemics like COVID-19.

scholarly journals Design of novel coil structure for wireless power transfer system supporting multi-load and 2-D free-positioning

2021 ◽  
Author(s):  
Kun Li ◽  
Haibo Zhao ◽  
Qing Liu ◽  
Yankai Shi ◽  
Changsong Wang ◽  
...  
Keyword(s):  
Mutual Inductance ◽  
Radius Ratio ◽  
Wireless Power ◽  
Equivalent Circuit Analysis ◽  
Spiral Coil ◽  
Coil Structure ◽  
Planar Coil ◽  
New Type ◽  
Wireless Power Transfer System ◽  
Receiving Coil

AbstractIn the classical WPT technology, when the load coil and the receiving coil are not aligned, the receiving power will be significantly reduced. In this paper, a new type of receiving coil named spiral add planar (SAP) coil is proposed, which can make the receiving power of the load coil almost independent of its position. The T-type equivalent circuit analysis method is used to analyze the transmission performance of the WPT system. By calculating the mutual inductance between non-coaxial coils, it can be proved theoretically that when the load coils are located at different positions, the mutual inductance between the SAP coil and the load coil is more stable comparing to the spiral coil or the planar coil. In addition, this SAP coil can support multiple loads and arbitrary movement of the load within the area of the SAP coil. This paper also proposed the concept of radius ratio (that is, the ratio of the radius of the load coil to the radius of the RX coil), and found that when the radius ratio is less than 1/2, the free-positioning characteristic is good. The simulation and experimental results show that when the load coil moves within the range of the SAP coil, the volatility of its S21 value is less than ± 1 dB.

scholarly journals An Improved Estimation Method of Mutual Inductance Angle for a Two-Dimensional Wireless Power Transfer System

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 448
Author(s):  
Sangyong Lee ◽  
Jeonho Lee ◽  
Jongkyum Kwon ◽  
Se-Kyo Chung
Keyword(s):  
Power Transmission ◽  
Estimation Method ◽  
Wireless Power Transfer ◽  
Transmission Efficiency ◽  
Mutual Inductance ◽  
Transfer System ◽  
Two Dimensional ◽  
Power Transfer ◽  
Wireless Power ◽  
Wireless Power Transfer System

The improvement of power transmission efficiency (PTE) is an important issue in the design of a wireless power transfer (WPT) system. The WPT system with multiple transmitting (Tx) or receiving (Rx) coils is a way to improve the PTE. This paper deals with the estimation of the mutual inductance angle for a two-dimensional (2D) WPT system with two Tx coils and one Rx coil. The mutual inductance angle is one of the most important parameters to determine the PTE in the 2D WPT system. The condition for the maximum PTE is investigated and the mutual inductance angle is defined for the 2D WPT system. An improved estimation method of the mutual inductance angle is proposed based on the phase-locked loop (PLL) technique using the voltages and currents of the Tx coils. The simulation and experimental results are provided to validate the effectiveness of the proposed method.

scholarly journals Optimization of Excitation Magnitudes and Phases for Maximum Efficiencies in a MISO Wireless Power Transfer System

2020 ◽  
Vol 20 (1) ◽  
pp. 16-22
Author(s):  
Hyeongwook Lee ◽  
Seunghyun Boo ◽  
Gunyoung Kim ◽  
Bomson Lee
Keyword(s):  
Wireless Power Transfer ◽  
Maximum Efficiency ◽  
Electromagnetic Simulation ◽  
Power Transfer ◽  
Wireless Power ◽  
Algorithm Optimization ◽  
Single Output ◽  
Multiple Input ◽  
Output System ◽  
Wireless Power Transfer System

This paper presents a method for solving receiver misalignment (axial or angular) problems in wireless power transfer systems using a multiple-input single-output system. The optimum magnitudes and phases of the transmitter voltages and receiver load for maximum efficiency are derived in convenient analytical forms when negligible mutual couplings between transmitters. These solutions are validated by genetic algorithm optimization and electromagnetic-simulation results for a design ex-ample of two transmitters and one rotating receiver.

scholarly journals Power Transfer Efficiency Analysis for Omnidirectional Wireless Power Transfer System Using Three-Phase-Shifted Drive

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2159 ◽  
Author(s):  
Zhaohong Ye ◽  
Yue Sun ◽  
Xiufang Liu ◽  
Peiyue Wang ◽  
Chunsen Tang ◽  
...  
Keyword(s):  
Power Transmission ◽  
Control Mechanism ◽  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Three Phase ◽  
Power Transfer Efficiency ◽  
Computer Emulation ◽  
Receiving Coil

In order to implement the omnidirectional wireless power transfer (WPT), a novel three-phase-shifted drive omnidirectional WPT system is proposed. This system is comprised of three independent phase-adjusted excitation sources, three orthogonal transmitting coils, and one planar receiving coil. Based on the mutual coupling theory, the power transfer efficiency is derived and the corresponding control mechanism for maximizing this efficiency is presented. This control mechanism only depends on the currents’ root-mean-square (RMS) values of the three transmitting coils and simple calculations after each location and/or posture change of the receiving coil, which provides the real-time possibility to design an omnidirectional WPT system comparing with the other omnidirectional systems. In aid of computer emulation technique, the efficiency characteristic versus the omnidirectional location and posture of the receiving coil is analyzed, and the analytical results verify the validity of the control mechanism. Lastly, a hardware prototype has been set up, and its omnidirectional power transmission capacity has been successfully verified. The experimental results show that the wireless power is omnidirectional and it can be effectively transmitted to a load even though its receiving coil moves and/or rotates in a 3-D energy region.

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