NDLI: Experimental Analysis of Input Impedance Matched AC-DC Converter for High-frequency Wireless Power Transfer

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Experimental Analysis of Input Impedance Matched AC-DC Converter for High-frequency Wireless Power Transfer

Content Provider	Semantic Scholar
Author	Keisuke, Kusaka Jun-Ichi, Itoh
Copyright Year	2012
Abstract	This paper presents the experimental analysis of the AC-DC converter for receiving side of the wireless power transfer system which converts the power from 13.56 MHz to DC. In a high-frequency region, an input impedance should be matched to the characteristic impedance of the transmission line. In this paper the proposed AC-DC converter is experimentally tested which can satisfy the input impedance matching without high-frequency switching except the diodes. From the experimental results, the input impedance of 52.7-j0.02  is obtained. It means that the input impedance of the proposed circuit can be matched to the 50+j0  at a reflection coefficient of 2.6%. Additionally, the input impedance of the AC-DC converter is maintained at 50+j0  even when the battery voltage of the load has fluctuated. Keyword AC-DC Converter,Wireless Power Transfer,Impedance Matching,Reflected Power 1. はじめに近年,環境問題への関心の高まりから電気自動車 (以下,「EV」)の普及が進んでいる.しかしながら,現在導入されているバッテリ充電設備は,有線で充電を行うため,ユーザ自身が充電操作を行う必要がある.そのため,ガソリン車と比較した際に,ユーザの利便性が損なわれ,普及の妨げとなっている. 本問題の解決法として,非接触充電の適用が挙げられる.その中でも特に,磁界共振結合方式を用いた非接触給電技術が近年盛んに研究されている .本方式は,共振を利用した電磁誘導方式と同様に,1 次側と 2 次側間の磁気結合を用いて電力伝送を行う.磁気結合を用いた非接触給電では,伝送効率が結合係数 k と伝送コイルの共振の鋭さ Q の積の関数となる . 電磁誘導方式では,トランスと同様に 1 次側と 2 次側の結合係数 k を高めることで高効率化を図る.そのため,コアを用いてトランスを構成することが多い . しかしながら,結合係数 k は伝送距離の 3 乗に比例して減少するため,伝送距離の増加と共に効率が急激に低下する . 一方,磁界共振結合方式では,伝送距離の変化に伴って低下する結合係数を補償するため,高 Q 値をもつ伝送コイルを用いて電力伝送を行う.高 Q 値化の観点から,高周波で非接触給電システムを駆動し,共振に必要とされるコイルのインダクタンスを低減することで,伝送素子の小型化及び高効率化を可能とする.こ
Starting Page	7
Ending Page	12
Page Count	6
File Format	PDF HTM / HTML
Volume Number	112
Alternate Webpage(s)	http://itohserver01.nagaokaut.ac.jp/itohlab/paper/2012/singaku/kusaka.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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