TY - JOUR
T1 - Automated impedance matching system for robust wireless power transfer via magnetic resonance coupling
AU - Beh, Teck Chuan
AU - Kato, Masaki
AU - Imura, Takehiro
AU - Oh, Sehoon
AU - Hori, Yoichi
PY - 2013
Y1 - 2013
N2 - Recently, a highly efficient midrange wireless transfer technology using electromagnetic resonance coupling has been proposed and has received much attention due to its practical range and efficiency. The resonance frequency of the resonators changes as the gap between the resonators changes. However, when this technology is applied in the megahertz range, the usable frequency is bounded by the industrial, scientific, and medical (ISM) band. Therefore, to achieve maximum power transmission efficiency, the resonance frequency has to be fixed within the ISM band. In this paper, an automated impedance matching (IM) system is proposed to increase the efficiency by matching the resonance frequency of the resonator pair to that of the power source. The simulations and experiments verify that the IM circuits can change the resonance frequency to 13.56 MHz (in the ISM band) for different air gaps, improving the power transfer efficiency. Experiments also verified that automated IM can be easily achieved just by observing and minimizing the reflected wave at the transmitting side of the system.
AB - Recently, a highly efficient midrange wireless transfer technology using electromagnetic resonance coupling has been proposed and has received much attention due to its practical range and efficiency. The resonance frequency of the resonators changes as the gap between the resonators changes. However, when this technology is applied in the megahertz range, the usable frequency is bounded by the industrial, scientific, and medical (ISM) band. Therefore, to achieve maximum power transmission efficiency, the resonance frequency has to be fixed within the ISM band. In this paper, an automated impedance matching (IM) system is proposed to increase the efficiency by matching the resonance frequency of the resonator pair to that of the power source. The simulations and experiments verify that the IM circuits can change the resonance frequency to 13.56 MHz (in the ISM band) for different air gaps, improving the power transfer efficiency. Experiments also verified that automated IM can be easily achieved just by observing and minimizing the reflected wave at the transmitting side of the system.
KW - Automation
KW - impedance matching (IM)
KW - maximum efficiency
KW - resonance frequency
KW - wireless power transfer (WPT)
UR - http://www.scopus.com/inward/record.url?scp=84877784553&partnerID=8YFLogxK
U2 - 10.1109/TIE.2012.2206337
DO - 10.1109/TIE.2012.2206337
M3 - Article
AN - SCOPUS:84877784553
SN - 0278-0046
VL - 60
SP - 3689
EP - 3698
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 9
M1 - 6226848
ER -