Coupling Extraction and Maximum Efficiency Tracking for Multiple Concurrent Transmitters in Dynamic Wireless Charging

Kim, Do-Hyeon; Kim, Seong–Min; Kim, Sangwon; Moon, Jung‐Ick; Cho, In‐Kui; Ahn, Do-Seob

doi:10.1109/tpel.2019.2962203

Cited by 26 publications

(6 citation statements)

References 23 publications

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“…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%

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%

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

Kanoun

Bradai

Khriji

et al. 2021

Sensors

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“…Considering the simplifications made in the mathematical model and the other stray factors, e.g., parameter variation, the following closed-loop control strategy can be adopted to maximize the system efficiency. The RX-side controller maintains at the target value by regulating using power converters, e.g., DC/DC converters [4], and the control algorithm is simple.…”

Section: Maximum Efficiency Tracking Controlmentioning

confidence: 99%

“…However, the disadvantages are higher leakage magnetic field strength and lower system efficiency because a large proportion of the magnetic flux generated by the TX coil is not coupled to the RX coil. Another method is to use selectively energized multiple TX coils [2], and furthermore, to optimize the energizing strategy [3][4]. The TX coils that are relatively strongly coupled to the RX coil are energized while those weakly coupled to the RX coils are in stand-by mode.…”

Section: Introductionmentioning

confidence: 99%

Dual-Transmitter Inductive Power Transfer System with Improved Misalignment Tolerance and High Compatibility with Different-Sized Receivers

Zhu¹,

Gao²

2021

Preprint

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A dual-transmitter inductive power transfer system featuring two concentric transmitter coils is proposed for low-power systems where compatibility with different-sized receivers and good misalignment tolerance are required. By incorporating two decoupled TXs into one single unit, the proposed scheme achieves better power and efficiency performance under a lower bill-of-materials cost compared to using two individual TXs, especially when the RX coil is small and the coil misalignment is large. Both TXs are energized using independent inverters and the inverter output voltages are regulated in accordance with the coupling condition to maximize the system efficiency. Superiority of the dual-TX system over single-TX systems is proved by experimental results. <br>

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“…The need for dynamic activation of coils in multi-Tx WPT systems may increase the system complexity due to the requirement of knowing the receiver position or mutual inductances between different Txs and Rx. For example, there have been several proposals to activate multiple Tx coils with the use of voltage and/or current measurements from both Tx and Rx sides [21]- [24] which require an additional communication channel for data transfer from the Rx-side to the Tx-side. Implementation of such data communication becomes complex and tedious when there are multiple receiver devices to be charged wirelessly in the same charging area.…”

Section: Introductionmentioning

confidence: 99%

Large-Area Free-Positioning Wireless Power Transfer to Movable Receivers

Mahmud

Panhwar

Jayathurathnage

2022

IEEE Trans. Ind. Electron.

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This paper introduces a method for efficient and robust free-positioning wireless power transfer (WPT) in a large area, which can be applied to many use cases including wireless charging of industrial robots, drones, or electric scooters. In these large area WPT applications, multiple transmitters (Txs) are placed in a pad-like area, and the transmitter coils are optimally excited to enable robust and efficient power transfer to movable receivers within the charging area. The proposed configuration enables almost continuous magnetic flux path from a set of Tx coil(s) to another set of Tx coil(s) through the receiver coil ferrite core. Therefore, efficient power transfer is ensured throughout the whole Tx coverage area. The paper introduces a novel method to detect the position and orientation of the receiver only from the Tx-side measurements. The proposed solution is experimentally verified in a laboratory prototype, and the experimental results show DC-to-DC efficiency of 91% with only 1% variation in most of the Rx positions.

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Coupling Extraction and Maximum Efficiency Tracking for Multiple Concurrent Transmitters in Dynamic Wireless Charging

Cited by 26 publications

References 23 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

Dual-Transmitter Inductive Power Transfer System with Improved Misalignment Tolerance and High Compatibility with Different-Sized Receivers

Large-Area Free-Positioning Wireless Power Transfer to Movable Receivers

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