Automatic Containment of Field Exposure for Roadway Wireless Electric Vehicle Charger

Yang, Yang; Wang, Jingyu; Huang, Zhicong; Iam, Io-Wa; Lam, Chi-Seng

doi:10.1109/tte.2023.3236684

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…Centralized control and communications among all the Txs are mandatory in such WPT systems due to the need for phase synchronization. These requirements bring a rapid increase in complexities to both control algorithms and system implementations compared with those systems that only need simple activation/deactivation that can be realized by modular ON/OFF control inside each Tx block [25] or passive circuits based on self-inductance variation [26] or impedance reflection [27]. In addition, systems with dynamic phase control do not offer any capacity for simultaneous charging of multiple devices, as it merely relocates blind spots from the Rx's current position to another location rather than completely eliminate them.…”

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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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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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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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“…The main disadvantages of dynamic wireless charging are higher infrastructure costs and lower power transfer efficiency. Yang et al (2023) discussed how in-pavement wireless chargers can dynamically charge vehicles as they move [30]. However, current methods require continuous operation at full power, which causes large standby currents and concerns of exposure to harmful electromagnetic radiation.…”

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confidence: 99%

Classifying Invention Objectives of Electric Vehicle Chargers through Natural Language Processing and Machine Learning

Bridgelall

2023

Inventions

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The gradual adoption of electric vehicles (EVs) globally serves as a crucial move toward addressing global decarbonization goals for sustainable development. However, the lack of cost-effective, power-efficient, and safe chargers for EV batteries hampers adoption. Understanding the research needs and identifying the gaps in EV charger innovation informs investments and research to address development challenges. This study developed a unique text mining workflow to classify themes in EV charger technology and product development by analyzing U.S. patent award summaries. The text mining workflow combined the techniques of data extraction, data cleaning, natural language processing (NLP), statistical analysis, and unsupervised machine learning (ML) to extract unique themes and to visualize their relationships. There was a 47.7% increase in the number of EV charger patents issued in 2022 relative to that in 2018. The top four themes were charging station management, power transfer efficiency, on-board charger design, and temperature management. More than half (53.8%) of the EV charger patents issued over the five-year period from 2018 to 2022 addressed problems within those four themes. Patents that addressed wireless charging, fast charging, and fleet charging accounted for less than 10% each of the EV charger patents issued. This suggests that the industry is still at the frontier of addressing those problems. This study further presents examples of the specific EV charger problems addressed within each theme. The findings can inform investment decisions and policymaking to focus on R&D resources that will advance the state of the art and spur EV adoption.

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Magnetic Field Mitigation in Dynamic Wireless Power Transfer Systems by Double Sided LCC Compensation

Campi,

Cruciani,

Maradei

et al. 2024

IEEE Access

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Automatic Containment of Field Exposure for Roadway Wireless Electric Vehicle Charger

Cited by 6 publications

References 29 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

Classifying Invention Objectives of Electric Vehicle Chargers through Natural Language Processing and Machine Learning

Magnetic Field Mitigation in Dynamic Wireless Power Transfer Systems by Double Sided LCC Compensation

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