TY - JOUR
T1 - A 13.56-MHz Wireless Power Transfer System With Enhanced Load-Transient Response and Efficiency by Fully Integrated Wireless Constant-Idle-Time Control for Biomedical Implants
AU - Huang, Cheng
AU - Kawajiri, Toru
AU - Ishikuro, Hiroki
N1 - Funding Information:
Manuscript received February 28, 2017; revised July 4, 2017; accepted October 20, 2017. Date of publication November 21, 2017; date of current version January 25, 2018. This paper was approved by Associate Editor Michiel A. P. Pertijs. This work was supported by CREST/JST. (Corresponding author: Cheng Huang.) The authors are with the Department of Electronics and Electrical Engineering, Keio University, Yokohama 223-8522, Japan (e-mail: doowtsewhuang@gmail.com; kawajiri@iskr.elec.keio.ac.jp; ishikuro@ elec.keio.ac.jp).
Publisher Copyright:
© 2017 IEEE.
PY - 2018/2
Y1 - 2018/2
N2 - In this paper, a complete wireless power transfer system with transmitter (TX) and receiver (RX) chips is presented. Both RX local and TX wireless output voltage regulations are achieved by the proposed constant-idle-time control without using any wires or additional discrete components, such as MCU, DAC, various kinds of controllers, and decoders, which were required in previous works. The system and circuitry design complexity is significantly reduced. Both TX and RX chips are fabricated in the TSMC 65-nm process with standard 2.5-V I/O devices, and the RX coil is fabricated using flexible printed circuits to demonstrate the performance for implantable applications. Up to 17.5% end-to-end total efficiency improvement is observed when enabling the wireless constant-idle-time controlled TX voltage regulation, and an instant load-transient response is also achieved. As a result, compared to previous works, this design achieves a higher total efficiency, a faster load-transient response, and a higher level of integration with a much lower system and circuitry design complexity.
AB - In this paper, a complete wireless power transfer system with transmitter (TX) and receiver (RX) chips is presented. Both RX local and TX wireless output voltage regulations are achieved by the proposed constant-idle-time control without using any wires or additional discrete components, such as MCU, DAC, various kinds of controllers, and decoders, which were required in previous works. The system and circuitry design complexity is significantly reduced. Both TX and RX chips are fabricated in the TSMC 65-nm process with standard 2.5-V I/O devices, and the RX coil is fabricated using flexible printed circuits to demonstrate the performance for implantable applications. Up to 17.5% end-to-end total efficiency improvement is observed when enabling the wireless constant-idle-time controlled TX voltage regulation, and an instant load-transient response is also achieved. As a result, compared to previous works, this design achieves a higher total efficiency, a faster load-transient response, and a higher level of integration with a much lower system and circuitry design complexity.
KW - Backscattering
KW - biomedical implants
KW - constant-idle-time
KW - efficiency
KW - flexible printed circuits (FPCs)
KW - full integration
KW - load-transient response
KW - voltage regulation
KW - wireless power transfer (WPT)
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U2 - 10.1109/JSSC.2017.2767181
DO - 10.1109/JSSC.2017.2767181
M3 - Article
AN - SCOPUS:85035815461
SN - 0018-9200
VL - 53
SP - 538
EP - 551
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
IS - 2
M1 - 8116746
ER -