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

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Keywords

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

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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