Optimum Transmitter Current Distribution for Dynamic Wireless Power Transfer With Segmented Array

Jayathurathnage, Prasad; Alphones, Arokiaswami; Vilathgamuwa, D.M.; Ong, Alex

doi:10.1109/tmtt.2017.2698460

Cited by 34 publications

(19 citation statements)

References 22 publications

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“…We define the currents in each Tx coil as  The nominal current I 0 will be determined depending on the power requirement. For optimal power transfer from multi-Tx to Rx, the optimal current coefficients can be derived as [5]…”

Section: Analysis Of Multi-tx Wpt Systems a Multi-transmitter Wpmentioning

confidence: 99%

“…Tx coils with strong coupling to the receiver transfer more power than the Tx coils with weak coupling. Therefore, coil currents in each Tx should be optimized depending on the mutual coupling between Tx-Rx pairs [5]. Depending on the mutual inductances between each Tx-Rx pair, the optimal current distribution in each Tx coil can be determined.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimal Excitation of Multi-transmitter Wireless Power Transfer System without Receiver Sensors

Jayathurathnage

2019

2019 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)

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The optimal excitation of multi-transmitter wireless power transfer systems is dependent on the position of the receiver (Rx). To maximize the output power and efficiency, the transmitter (Tx) coils closer to the Rx should have higher currents compared to the ones farther away. This paper presents a simple approach to determine the optimal excitation of individual Tx without using any measurement at the Rx side. The Tx coils are arranged to be uncoupled from adjacent Tx coils. In this configuration, the optimal current distribution in each Tx coil is a function of the mutual inductances of each Tx-Rx coil pair, which can be evaluated by analyzing the voltage measurements at Tx coils. The proposed approach is experimentally verified using a laboratory prototype.

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Section: Analysis Of Multi-tx Wpt Systems a Multi-transmitter Wpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Excitation of Multi-transmitter Wireless Power Transfer System without Receiver Sensors

Jayathurathnage

2019

2019 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)

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“…However, such simultaneous and homogeneous activation is not optimal because different transmitting coils have different levels of coupling with the receiver. In fact, the optimal ratio of Tx coil currents depends on the mutual inductance of every Tx-Rx pair [9], [10]. Therefore, simultaneous activation of many transmitters incur unnecessary VOLUME 4, 2016 power losses in those transmitters which are weakly coupled with the receiver.…”

Section: Introductionmentioning

confidence: 99%

Self-Tuning Multi-Transmitter Wireless Power Transfer to Freely Positioned Receivers

et al. 2020

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Free positioning of receivers is one of the key requirements for many wireless power transfer (WPT) applications, necessary from the end-user point of view. However, realization of stable and effective wireless power transfer for freely positioned receivers is technically challenging because of the need of complex control and tuning circuits. In this paper, we propose a concept of power channeling via an array of repeaters that enables self-tuning of multi-transmitter WPT systems without any sensing or control elements. The proposed WPT system consists of uncoupled transmitters and uncoupled repeaters which form independent power transfer channels. The proposed self-tuning WPT system is capable of maintaining stable output power with constant high efficiency regardless of the receiver position. Namely, our numerical and experimental results for a four-transmitter WPT system in form of a linear array show the efficiency 94.5 ± 2% for any position of the receiver within 20 mm range. INDEX TERMS Wireless power transfer, overlapping coils, multiple transmitter coils, free positioning.

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“…In addition, a multi-loading decoupling control mechanism was also demonstrated, whereby each secondary coil received a consistent supply of energy without being affected by the addition or removal of a coil. Paper [12] investigated an analytical solution for the theoretical optimum transmitter current using a current-amplitude modulation scheme based on the analogy of the N-dimensional Cartesian coordinate equivalent of spherical coordinates to achieve the maximum efficiency of the system. Paper [13] presented a simple abstract approach for modeling a WPT system using multiple transmitter coils that attempt to transfer power to a single receiver coil.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Control for Multi-Excitation Units WPT System With Multiple Coupling Parameter Identification and Area Adaptation

Dai

Jiang

et al. 2020

IEEE Access

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In a multiple excitation unit wireless power transfer system, power control flexibility is a critical feature. To develop a system with environmental sensing capability and a smart power distribution strategy, a cooperative control method is proposed for the excitation units. A multiple coupling coefficient identification method was developed by utilizing the DC information of each excitation unit. Furthermore, a bi-operation mode with adaptive area division is proposed to achieve maximum efficiency in the optimum coupling area and to satisfy the fundamental power requirement for a weak coupling area. In the identification and control implementation process, this method is easy to implement and the response speed can be guaranteed because only the DC input current and the duty cycle of the DC regulator information are required. In addition, the proposed approach was evaluated based on experimental analysis.

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Optimum Transmitter Current Distribution for Dynamic Wireless Power Transfer With Segmented Array

Cited by 34 publications

References 22 publications

Optimal Excitation of Multi-transmitter Wireless Power Transfer System without Receiver Sensors

Optimal Excitation of Multi-transmitter Wireless Power Transfer System without Receiver Sensors

Self-Tuning Multi-Transmitter Wireless Power Transfer to Freely Positioned Receivers

Cooperative Control for Multi-Excitation Units WPT System With Multiple Coupling Parameter Identification and Area Adaptation

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