Novel IPT Multi-Transmitter Coils with Increase Misalignment Tolerance and System Efficiency

Sritongon, Chayapas; Wisestherrakul, Paweewatch; Hansupho, Nattawut; Nutwong, Supapong; Sangswang, Anawach; Naetiladdanon, Sumate; Mujjalinvimut, Ekkachai

doi:10.1109/iscas.2018.8351305

Cited by 18 publications

(12 citation statements)

References 9 publications

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“…A multi-transmitter system provides flexible mobility to a receiver, and it is suitable for portable chargers. Also, the multi-transmitter system is used to avoid misalignment that decreases the efficiency and power transfer ratings [3]. A multi-receiver system contributes to EV chargers to flexible charging at parking.…”

Section: Introductionmentioning

confidence: 99%

Fault Tolerant Modular Inductive Power Transfer System Design Using Resonator Coil

Polat¹

2021

Preprint

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<div>In this paper, a design for an inductive power transfer system with a series-series topology with an intermediate resonator is discussed. The proposed method is an improved method that is derived from a conventional IPT system design. While it is applicable for a wide range of different operations, a contactless slip ring design is the main system under investigation. The idea behind adding a resonator coil is to achieve fault tolerance where the system can operate under various open-circuited fault conditions. The proposed system is a two transmitter and four receiver with an intermediate resonator system where the Rx modules are connected parallel to a common DC-bus. </div><div>The system is found to be fault-tolerant to Rx side open circuit faults. For normal operation at rated power, 90.6\% efficiency was achieved.</div>

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Section: Introductionmentioning

confidence: 99%

Fault Tolerant Modular Inductive Power Transfer System Design Using Resonator Coil

Polat¹

2021

Preprint

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“…On the other hand, multiple-transceiver configurations using two or more Txs or Rxs have also been studied to overcome the misalignment issue. In [16] and [17], it was experimentally verified that a multi-Tx system using two or more Txs transfers power more efficiently with a wider area than a single-Tx system. It is well-known that, for high efficiency in a multi-Tx system, the amplitude of the input signal should be adjusted in proportion to the coupling coefficient between the Txs and Rx [18].…”

Section: Introductionmentioning

confidence: 99%

Capacitance Tuning Method for Maximum Output Power in Multiple-Transmitter Wireless Power Transfer System

Jeon

Seo

2020

IEEE Access

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It is common knowledge that wireless power transfer (WPT) systems with multiple transmitters (Txs) and a single receiver (Rx) have robust efficiency against lateral misalignment. However, the unnecessary coupling among Txs in actual multi-Tx WPT systems causes transmission efficiency degradation, and then additional tuning work is required to adjust some system parameters, such as the phase or frequency of Tx sources. Moreover, the frequency-splitting phenomenon caused by over-coupling between the Txs and Rx still occurs in multi-Tx systems. Thus, output power degradation is inevitable in the over-coupled state. In this paper, we propose an optimal capacitance tuning method that is applicable to multi-Tx WPT systems. A multi-Tx WPT system tuned with the optimal capacitances, which are obtained from the critical coupling condition between Txs and Rx, not only compensates the inner coupling among Txs but also achieves the maximum output power in the over-coupled state. To verify the validity of the proposed method, we implemented two-and three-Tx and single Rx WPT systems and measured the output power of load with respect to the Rx position along the x-and y-axes. As a result, with the proposed method without any changes in the operating frequency or phase, the systems could deliver higher output power than the conventional phase-controlled system. In particular, with the proposed method, the systems maintained the constant maximum transmission efficiency of 80% in the over-coupled state. INDEX TERMS magnetic beamforming, multiple transmitter, maximum output power, optimal tuning, power transfer efficiency, transmission efficiency, wireless power transfer.

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“…Recently, multi-coil wireless power transfer (WPT) systems using three or more coils have been proposed to achieve a high power transfer efficiency (PTE) at greater distance than in the case of a conventional two-coil WPT system [1][2][3][4][5][6][7][8][9][10][11][12]. The multi-coil WPT systems are categorized into the domino structure and multiple transmitting (or receiving) coils structure.…”

Section: Introductionmentioning

confidence: 99%

“…To achieve a long transmission distance, the structure adjusts the capacitance of each coil or gaps among coils. On the other hand, multiple transmitting (or receiving) coils correspond to the multiple input single output (MISO) or single input multiple output (SIMO) system in the wireless communication field [7][8][9][10][11][12]. The WPT system with multiple transmitting coils usually maximizes the power in the receiving coil through entering power of different magnitude or phase into transmitting coils.…”

Section: Introductionmentioning

confidence: 99%

Unilateral Route Method to Estimate Practical Mutual Inductance for Multi-Coil WPT System

2020

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Multi-coil WPT systems require mutual inductance information between coils to increase the power transmission efficiency. However, in the high frequency (HF) bands such as 6.78 MHz and 13.56 MHz, the presence of surrounding coils changes the value of the mutual inductance between the two coils due to the parasitic element effect of the coils. These parasitic effects make it harder to estimate the mutual inductance among three or more coils. In contrast to ideal mutual inductance, which has a constant value regardless of frequency and surrounding coils, we define the practical mutual inductance as the mutual inductance varied by parasitic elements. In this paper, a new method is presented to estimate the practical mutual inductance between multiple coils in the HF band. The proposed method simply configures the expression of practical mutual inductance formula because only one of two bilateral dependent voltage sources generated by mutual inductance is considered. For several coils placed along the same axis, the practical mutual inductances between coils were measured with respect to the distance between them to validate the proposed method. The practical mutual inductance obtained from the proposed method was consistent with the simulated and measured values in HF band.

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Novel IPT Multi-Transmitter Coils with Increase Misalignment Tolerance and System Efficiency

Cited by 18 publications

References 9 publications

Fault Tolerant Modular Inductive Power Transfer System Design Using Resonator Coil

Fault Tolerant Modular Inductive Power Transfer System Design Using Resonator Coil

Capacitance Tuning Method for Maximum Output Power in Multiple-Transmitter Wireless Power Transfer System

Unilateral Route Method to Estimate Practical Mutual Inductance for Multi-Coil WPT System

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