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

Toru Kawajiri; Hiroki Ishikuro

doi:10.1109/MWSYM.2017.8059107

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 proceeding › Conference 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 language	English
Title of host publication	2017 IEEE MTT-S International Microwave Symposium, IMS 2017
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	315-317
Number of pages	3
ISBN (Electronic)	9781509063604
DOIs	https://doi.org/10.1109/MWSYM.2017.8059107
Publication status	Published - 2017 Oct 4
Event	2017 IEEE MTT-S International Microwave Symposium, IMS 2017 - Honololu, United States Duration: 2017 Jun 4 → 2017 Jun 9

Other

Other	2017 IEEE MTT-S International Microwave Symposium, IMS 2017
Country	United States
City	Honololu
Period	17/6/4 → 17/6/9

Keywords

Magnetically coupled resonant
Printed spiral resonator
Wireless power transfer

ASJC Scopus subject areas

Radiation
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/MWSYM.2017.8059107

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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

Open loop dynamic transmitter voltage scaling for fast response and wide load range power efficient WPT system. / Kawajiri, Toru; Ishikuro, Hiroki.

2017 IEEE MTT-S International Microwave Symposium, IMS 2017. Institute of Electrical and Electronics Engineers Inc., 2017. p. 315-317 8059107.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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., 8059107, Institute of Electrical and Electronics Engineers Inc., pp. 315-317, 2017 IEEE MTT-S International Microwave Symposium, IMS 2017, Honololu, United States, 17/6/4. https://doi.org/10.1109/MWSYM.2017.8059107

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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.",

keywords = "Magnetically coupled resonant, Printed spiral resonator, Wireless power transfer",

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