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    Improved CPT system with less voltage stress and sensitivity using a step-down transformer on receiving side

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    Type
    Article
    Authors
    Mostafa, Tarek Mahmoud Atia
    Muharam, Aam
    Hu, Aiguo Patrick
    Hattori, Reiji
    KAUST Department
    Upstream Petroleum Engineering Research Center (UPERC)
    Date
    2019-08-28
    Permanent link to this record
    http://hdl.handle.net/10754/656721
    
    Metadata
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    Abstract
    This paper proposes a capacitive power transfer (CPT) system with a step-down transformer on the secondary side to reduce the circuit quality factor (Q), and thereby reduce the sensitivity to parameters variations, as well as the voltage stress across the coupling interface. The system operating principle is analyzed mathematically, and the focus is given to understand the effect of the leakage inductance (Llk) of the non-ideal transformer on the system performance. The analytical and simulation results show that at a given constant output power, the voltage across the plates is significantly reduced, and the system becomes less sensitive to the coupling variations by increasing the turns ratio of the step-down transformer. It is found that Llk can be advantageously utilized as a tuning inductor (L) or part of it. The proposed method is verified by building a prototype CPT system that delivered 25 W at an operation frequency of 1 MHz, and an efficiency of more than 70%. Simultaneously, the voltage stress across the single pair of the coupling plates is reduced from 252 V of a conventional CPT system without a step-down transformer, to 50.4 V using a high-frequency transformer with a turns ratio of 5.
    Citation
    Mostafa, T. M., Muharam, A., Patrick Hu, A., & Hattori, R. (2019). Improved CPT system with less voltage stress and sensitivity using a step-down transformer on receiving side. IET Power Electronics, 12(10), 2634–2641. doi:10.1049/iet-pel.2018.6206
    Publisher
    Institution of Engineering and Technology (IET)
    Journal
    IET Power Electronics
    DOI
    10.1049/iet-pel.2018.6206
    Additional Links
    https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.6206
    ae974a485f413a2113503eed53cd6c53
    10.1049/iet-pel.2018.6206
    Scopus Count
    Collections
    Articles; Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)

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