Open loop dynamic transmitter voltage scaling for fast response and wide load range power efficient WPT system

Toru Kawajiri, Hiroki Ishikuro

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    This paper presents a fast response wireless power delivery system with open loop dynamic transmitter voltage scaling technique to keep power efficiency in wide load range. In this technique, according to change of receiver side power consumption, the driving voltage of the transmitter (TX) coil is properly adjusted to control transmission power. The transmitting power and switching loss can be reduced in proportion to the square of the driving voltage. Therefore, it can improve power efficiency. To enhance power control speed, the driving voltage is not locally regulated but automatically determined by the feedback loop of the total WPT system. Fabricated test chips in 180-nm LDMOS process achieved maximum power efficiency of 50.9% when the output power is 0.5W. The output power ranges from 0.03W to 0.5W. The output voltage ripple is kept within 3.5% even when the output power is abruptly changed by one order of magnitude.

    Original languageEnglish
    Title of host publication2017 IEEE MTT-S International Microwave Symposium, IMS 2017
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages315-317
    Number of pages3
    ISBN (Electronic)9781509063604
    DOIs
    Publication statusPublished - 2017 Oct 4
    Event2017 IEEE MTT-S International Microwave Symposium, IMS 2017 - Honololu, United States
    Duration: 2017 Jun 42017 Jun 9

    Other

    Other2017 IEEE MTT-S International Microwave Symposium, IMS 2017
    CountryUnited States
    CityHonololu
    Period17/6/417/6/9

    Keywords

    • Magnetically coupled resonant
    • Printed spiral resonator
    • Wireless power transfer

    ASJC Scopus subject areas

    • Radiation
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

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  • Cite this

    Kawajiri, T., & Ishikuro, H. (2017). Open loop dynamic transmitter voltage scaling for fast response and wide load range power efficient WPT system. In 2017 IEEE MTT-S International Microwave Symposium, IMS 2017 (pp. 315-317). [8059107] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MWSYM.2017.8059107