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Maximizing the efficiency of wireless power transfer with a receiver-side switching voltage regulator

Published online by Cambridge University Press:  08 February 2017

Yoshiaki Narusue ,
Yoshihiro Kawahara  and
Tohru Asami
Yoshiaki Narusue*
Affiliation:
Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. Phone: +81-3-5841-6710 JSPS Research Fellow DC1, 5-3-1, Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
Yoshihiro Kawahara
Affiliation:
Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. Phone: +81-3-5841-6710
Tohru Asami
Affiliation:
Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. Phone: +81-3-5841-6710
*
Corresponding author: Y. Narusue Email: narusue@akg.t.u-tokyo.ac.jp
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Abstract

Output voltage regulation is an essential technology for achieving stable wireless power supply. A receiver-side switching voltage regulator is useful for realizing output voltage regulation. However, this paper shows that the switching voltage regulator degrades the transfer efficiency to below 50% in a wireless power transfer system that consists of a class-D power inverter and series-resonant transmitting and receiving resonators. Such efficiency degradation is caused by the instability of an operating point where the efficiency is >50%. The input resistance value of the switching voltage regulator at a stable operating point is much higher than the optimum value for maximizing the efficiency. To stabilize the high-efficiency operating points, this paper formulates a stability condition and derives its sufficient condition. The sufficient condition facilitates a system design method using a K-impedance inverter that allows for the optimum input resistance value to lie in the range of allowable input resistance values. In addition, we introduce an input-voltage-based efficiency maximization method for the system with the receiver-side switching voltage regulator. By combining these two methods, efficiency maximization is realized with the receiver-side switching voltage regulator. The proposed methods were verified by both simulations and measurements.

Keywords

Wireless power transferMagnetic resonant couplingSwitching voltage regulator
Type
Research Article
Information
Wireless Power Transfer , Volume 4 , Issue 1 , March 2017 , pp. 42 - 54
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Copyright
Copyright © Cambridge University Press 2017 

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References

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