Geometric View to Class-E Operation of RF Power Inverters
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- 形態
- 価格
- 一般価格(税込)：￥1,100 会員価格(税込)：￥880
- 文献番号
- 20214317
- 文献・情報種別
- その他の国際会議
No.D1.1
- 掲載ページ
- 1-4(Total 4 p)
- 発行年月
- 2021年 5月
- 出版社
- (公社)自動車技術会
- 言語
- 英語
- イベント
- 第5回電動車両技術国際会議 EVTeC 2021【オンライン開催】
書誌事項
| カテゴリ（英） | Wireless Power Transfer I 翻訳 |
|---|---|
| 著者（英） | 1) Takashi Ohira |
| 勤務先（英） | 1) Toyohashi University of Technology |
| 抄録（英） | This paper revisits the theory of class-E inverters using plane geometry. Given the circuit’s constituent LCR parameters and DC supply voltage, the harmonic balance technique derives three linear equations for DC current consumption and RF output wave. These linear equations can be algebraically solved, but their general solutions result in complicated functions of the LCR parameters. When the LCR parameters are adjusted to meet the zero-voltage-switching (ZVS) condition, the solutions become quite simplified. We find that the ZVS condition draws a semicircle on a complex load impedance plane, where an off-nadir angle signifies the inverter’s output phase. We also find another semicircle designating the zero-voltage-derivative-switching (ZVDS) condition on the same plane. The two semicircles intersect at a single point signifying the class-E inverter’s nominal load impedance. A load-pull consideration clarifies the output voltagecurrent relation, and yields a straight line locus on the V-I plane. From this line’s intercepts and slope, we find the inverter’s Thévenin equivalent whose output impedance is 4/π2 times the nominal load resistance. Along with these outcomes, we also show useful mathematical expressions of the RF output power and DC-RF conversion efficiency in terms of the load resistance. 翻訳 |
