Large air gap misalignment tolerable multi‐coil inductive power transfer for wireless sensors

Kallel, Bilel; Kanoun, Olfa; Trabelsi, Hafedh

doi:10.1049/iet-pel.2015.0800

Cited by 43 publications

(15 citation statements)

References 29 publications

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“…This can be realized by controlling the system frequency [ 57 ], the system gain [ 58 ], the compensation capacitors [ 59 ] and the DC-DC rectifier [ 60 ]. To overcome misalignment effects, multiple input–single output (MISO) coil systems can be realized [ 61 ], which are composed of multiple transmitter coils connected in series [ 62 , 63 ] or parallel [ 64 , 65 ]. The sending coils can be activated simultaneously [ 62 ] or one-by-one independently [ 65 ] using multiple supply circuits [ 66 ], switches [ 64 , 67 ] or both [ 68 ].…”

Section: Energy Supply For Wireless Sensor Nodesmentioning

confidence: 99%

“…To overcome misalignment effects, multiple input–single output (MISO) coil systems can be realized [ 61 ], which are composed of multiple transmitter coils connected in series [ 62 , 63 ] or parallel [ 64 , 65 ]. The sending coils can be activated simultaneously [ 62 ] or one-by-one independently [ 65 ] using multiple supply circuits [ 66 ], switches [ 64 , 67 ] or both [ 68 ]. The main difference between systems used to charge batteries and those to supply battery-free devices is the detection procedure.…”

Section: Energy Supply For Wireless Sensor Nodesmentioning

confidence: 99%

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Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review

Kanoun

Bradai

Khriji

et al. 2021

Sensors

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Nowadays, wireless sensor networks are becoming increasingly important in several sectors including industry, transportation, environment and medicine. This trend is reinforced by the spread of Internet of Things (IoT) technologies in almost all sectors. Autonomous energy supply is thereby an essential aspect as it decides the flexible positioning and easy maintenance, which are decisive for the acceptance of this technology, its wide use and sustainability. Significant improvements made in the last years have shown interesting possibilities for realizing energy-aware wireless sensor nodes (WSNs) by designing manifold and highly efficient energy converters and reducing energy consumption of hardware, software and communication protocols. Using only a few of these techniques or focusing on only one aspect is not sufficient to realize practicable and market relevant solutions. This paper therefore provides a comprehensive review on system design for battery-free and energy-aware WSN, making use of ambient energy or wireless energy transmission. It addresses energy supply strategies and gives a deep insight in energy management methods as well as possibilities for energy saving on node and network level. The aim therefore is to provide deep insight into system design and increase awareness of suitable techniques for realizing battery-free and energy-aware wireless sensor nodes.

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Section: Energy Supply For Wireless Sensor Nodesmentioning

confidence: 99%

Section: Energy Supply For Wireless Sensor Nodesmentioning

confidence: 99%

Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review

Kanoun

Bradai

Khriji

et al. 2021

Sensors

Self Cite

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“…Table 1 presents an overview of recent and important multi-coil WPT systems architectures and their characteristics. Homogenous multi-coil systems simultaneously activate all transmitting coils, which are connected in series to each other [25][26][27]. The used primary side supply circuit is simple and similar to the supply circuit of a single-coil WPT system.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.This reduces the size of the supply circuit relative to the previous solutions. In [19], a multi-coil system with multiplexed solution is presented with a singular supply circuit. However, the selection of the appropriate coil requires dual MOSFET switches, which presents some similarity to a switch-based multi-coil system. Nevertheless, the control of the multi-coil system switches needs microcontrollers with a high number of pins. For that, in case of a big number of transmitting coils, an FPGA [22] is proposed as processing unit, leading to an increase of both energy consumption and costs.In this paper, we investigate the feasibility of a multiplexed circuit on the primary side supply approach, with the aim to reduce the circuit size and to control the system by a simple microcontroller with a limited number of pins. The main objective is to significantly decrease both energy consumption and system costs. To this end, we propose to use receiving coils having the double diameter of the transmitting coils. This is important to cover at least a singular transmitting coil for different possible positions on the top of the pad to power the device for all the possible positions. In order to enable the detection and the powering of even battery-free wireless sensor nodes, we propose that the communication between the transmitting and receiving coil is started from the transmitting side and supplied from the transferred energy on the secondary side.The paper is organized as follows: In Section 2, the primary side supply circuit for a system is presented. The description of the proposed multi-coil system control algorithm is detailed in Section 3. The experimental evaluation of the developed algorithm are reported in Section 4. Section 5 shows the analysis of the required time to start the charging process. A conclusion is provided in Section 6. Design of the Primar...

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“…Several methods have been proposed on coil design to generate a uniform magnetic field. The coil array made of many smaller coils could produce a uniform magnetic field [12, 13]. This design is not suitable for EV wireless charging because the self‐inductance of the transmitter coil would be so large that the voltage of the coil would be very high.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of planar rectangular coil achieving uniform magnetic field distribution for EV wireless charging based on genetic algorithm

Wang

Guo

Zhang

2019

IET Power Electronics

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Inductive power transfer is a method that can be used to transfer power to electric vehicles. The output power and the transmission efficiency drop significantly when there is a misalignment between receiver on the vehicle and transmitter on the parking spot. This can be resolved by designing the transmitter coil that produces uniform magnetic fields for wireless charging. Here, a planar rectangular coil with unevenly spaced turns is proposed for improving the uniform magnetic field distribution over the charging zone, together with the genetic algorithm for determining the geometric parameters of the coil structure. An analysis that is divided into four design variables is presented. The magnetic characteristic of the optimal unevenly spaced transmitter coil using genetic algorithm and optimal evenly spaced transmitter coil using conventional method are compared and analysed. The uniform magnetic field distribution of the designed prototype is measured by an electric and magnetic field probe and by a receiver coil. The measured results agree well with the theoretical values and validate the improved uniform magnetic field distribution.

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Large air gap misalignment tolerable multi‐coil inductive power transfer for wireless sensors

Cited by 43 publications

References 29 publications

Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review

Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review

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

Optimisation of planar rectangular coil achieving uniform magnetic field distribution for EV wireless charging based on genetic algorithm

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