An Optimized Coil Array and Passivity-Based Control for Receiving Side Multilevel Connected DC-DC Converter of Dynamic Wireless Charging

Liu, Jia; Liu, Zhitao; Chen, Wenjie; Sun, Xuhui; Su, Hongye

doi:10.1109/tvt.2022.3146636

Cited by 19 publications

(7 citation statements)

References 28 publications

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“…where amplitude A in and phase φ in of the total induced voltage v ac,in are calculated as (11) and ( 12) is shown at the bottom of this page. These equations indicate that with noncoherent combining, the amplitude and phase of the total induced voltage are also functions of time instead of only affected by the Rx position.…”

Section: Time-domain Equationmentioning

confidence: 99%

“…However, due to the low misalignment tolerance of spiral coils, the power transfer encounters high pulsation since the magnetic field is weak at those positions between segmented coils. Comprehensive optimization of coil dimensions [10], [11] is required to mitigate coupling fluctuations for 1-D linear movements. For a larger charging area, overlapped coils [12] or dynamic controls [13] are needed to reduce the fluctuations in power and efficiency.…”

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confidence: 99%

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Noncoherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area

Liu,

Al Mahmud,

Ha-Van

et al. 2024

IEEE Trans. Ind. Electron.

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In this article, we propose a new coilenergizing method for multitransmitter (Tx) wireless power transfer (WPT) systems that enable complete freedom of receiver (Rx) positioning in a large area. The principle is based on noncoherent power combining, where multiple Tx coils are supplied in a predefined pattern by mixing two slightly different frequencies and four different phase angles. The powers delivered from Tx coils at two frequencies are then combined incoherently at the Rx side, resulting in full positional and rotational freedom for the Rx charging. The power transfer blind spots in conventional WPT systems are completely eliminated with the proposed noncoherent power combining method due to its natural robustness against cancelations. The experimental setup shows constant dc-dc power transfer efficiency around 90% for arbitrary Rx movements without any further requirements on dynamic controls of Txs or Rxs other than the simplest activation/deactivation. Index Terms-Blind spots elimination, full charging freedom, large transmitting area, noncoherent power combining, wireless power transmission (WPT). I. INTRODUCTIONE FFICIENT and uninterrupted wireless power transfer (WPT) in a large area facilitates wireless charging for a wide range of applications encompassing consumer electronics [1], kitchen appliances [2], and automated robots [3]. For example, a WPT system employing multiple transmitters (Txs) can be integrated into a table or kitchen top to enable seamless Manuscript

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Section: Time-domain Equationmentioning

confidence: 99%

mentioning

confidence: 99%

Noncoherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area

Liu,

Al Mahmud,

Ha-Van

et al. 2024

IEEE Trans. Ind. Electron.

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“…To maintain the mutual coupling between transmitter coils and receiver uniform, authors in [48] optimized the receiver pad size, which limited the coupling coefficient variation and power fluctuation to ±2.1% and ±2.9%, respectively. Authors in [49] adopt a receiver coil larger than the segmented transmitter coils, in which the receiver coil's size is optimized to realize the minimum output variation with ±1.5% fluctuation in power profile. Circular and rectangular pads are the most frequent structures used in the wireless charging of electric vehicles due to their simplicity and low cost [50], [51].…”

Section: B Segmented Coil Arraymentioning

confidence: 99%

Comprehensive Review on Power Pulsation in Dynamic Wireless Charging of Electric Vehicles

Behnamfar,

Olowu,

Tariq

et al. 2024

IEEE Access

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Dynamic wireless charging systems (DWCS) for electric vehicles is an effective solution to overcome driving range anxiety, high volume, and cost of battery by offering continuous charging for electric vehicles in motion. However, this technology suffers from some challenges associated with the high cost of infrastructure and power pulsation at the battery side, hindering the widescale commercial adoption of the technology. As the electric vehicle moves along the transmitter coils, power pulsation arises due to fluctuation in the mutual coupling, which deteriorates the battery's lifetime and the overall system's efficiency. In recent years, a significant volume of research methodologies have been proposed to address power fluctuation in DWCS. These methods can be categorized into three main areas, which include developing magnetic coil structures to suppress the coupling variation, optimizing the compensation network for coping with the coupling fluctuation, and applying controllers for output power stabilization. This paper presents a comprehensive review of the current literature on magnetic coil structures, compensation network topologies, and control schemes aiming to address the impacts of power variation in DWCS. This paper gives a new and holistic insight into the challenges and the corresponding solutions to address the power pulsation issues in DWCS. INDEX TERMSCompensation network, Control schemes, Dynamic wireless charging systems, (DWCS), Electric vehicle (EV) Inductive coils, Power pulsation, Wireless power transfer (WPT).

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“…Basic figures to illustrate the difference between one and multiple coils are shown in Figure 1. Actually, for some high-power application scenarios, the power level of the one-to-one mode is limited and needs to withstand greater voltage and current stress, and there is not enough flexibility in some application places [5,6]. The limitations of the one-to-one WPT system in the charging area have led people to adopt the coil array method to expand the charging range, and the method of connecting multiple transmitting coils in parallel with a single input source or one primary coil with one excitation source has been utilized.…”

Section: Introductionmentioning

confidence: 99%

Frequency Stability Analysis and Charging Area Expanding Optimal Design for Matrix Coupling Mechanism in Wireless Power Transfer System

Jiang,

Meng

2024

Electronics

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The matrix coupling mechanism brings flexibility and reliability to energy supply in the form of multiple transmitting coils and is now favored in most wireless energy transmission applications, such as wireless charging boards for mobile phones, inspection robots, and so on. However, the process of considering the layout of the matrix coupling mechanism and the output performance based on the target in space is very complex, while also taking into account the need to avoid impedance changes caused by cross-interference between each unit, which can lead to frequency inconsistency. This paper proposes a design method based on space charging area expansion for matrix coupling mechanisms, and on this basis, it focuses on analyzing the impedance mismatch phenomenon caused by cross mutual inductance and inconsistent mutual inductance between coil units, in order to obtain the optimal topology to avoid frequency drift as much as possible. Finally, the effectiveness of the method is validated through simulation and experiments.

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An Optimized Coil Array and Passivity-Based Control for Receiving Side Multilevel Connected DC-DC Converter of Dynamic Wireless Charging

Cited by 19 publications

References 28 publications

Noncoherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area

Noncoherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area

Comprehensive Review on Power Pulsation in Dynamic Wireless Charging of Electric Vehicles

Frequency Stability Analysis and Charging Area Expanding Optimal Design for Matrix Coupling Mechanism in Wireless Power Transfer System

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