| Title |
Study on the Effect of Resonant Coil Size and Load Resistance on the Transmission Efficiency of Magnetic Resonance Wireless Power Transfer System |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2012.26.7.045 |
| Keywords |
Wireless Power Transfer ; Magnetic Resonance ; Coupling Coefficients ; Self Resonator |
| Abstract |
In this paper, the wireless power transfer system using the magnetic resonance was designed and the effect of resonant coil radius and load resistance to this system was analyzed by the circuit analysis method. As a result, the calculated transmitted-power is similar to measured one, and the coil size has a small effect to the coupling coefficients in the resonant frequency band. In addition, the fact that the calculated transmitted-power according to the source frequency is similar to measured one confirms that the circuit analysis methode in this paper is valid. The input side transmission efficiency ηi including only the loss in the power transfer circuit is almost 90[%] with the large coil in the 10[cm] transfer distance, and 65[%] with the small coil in 1[cm]. The source side transmission efficiency ηs is 30～40[%] at both coil when load resistance below 4.7[Ω] has been connected. Considering that the maximum ηs is 50[%], this is valid in the practical applications. |