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標題: | 有效利用無線射頻電能於智慧卡的顯示應用 High Efficiency RF Power for Application of Smartcard Display |
作者: | Chun-Hao Huang 黃俊豪 |
指導教授: | 顏家鈺 |
關鍵字: | 電磁共振,S參數,阻抗匹配電路,雙層天線,電磁強度, electromagnetic resonance,S-parameter,impedance matching circuit,double layer antenna,electromagnetic intensity, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 本研究目的為開發一種智慧卡的顯示器(總厚度小於2mm)相關技術與其無線充電技術,該顯示器適於無線接收來自遠端讀寫器的資料與電能,因為在地鐵車站或消費場合刷卡時間都極為短暫,如何在如此短時間內傳送足夠電能改變顯示器上的資訊,是本計畫要解決的重點。
該智慧卡之組成包括主體、電子紙、電子紙驅動元件、微處理器及接收單元。電子紙模組配置於主體,用於顯示智慧卡所載與使用場合相關之內容與資訊。電子紙驅動元件亦配置於智慧卡主體且電性連接於電子紙。接收單元無線接收資料及電能,以將電能傳遞至電子紙驅動元件,並透過微處理器將資料傳遞至電子紙驅動元件。電子紙驅動元件藉由資料及電能驅動電子紙顯示資訊。本研究將估算驅動電子紙作動所需之能量,並計算使用者在消費刷卡之短時間內達成此能量傳輸所需建立之傳輸「功率」,以無線傳輸能量的技術已經有許多研究成果,欲傳輸並接收此能量應為可行,但是如何縮小接收器的體積至智慧卡可接受的程度,同時維持足夠的傳輸功率則勢必形成兩項矛盾的要求 為了短時間傳輸足夠的電能,本論文以天線設計的阻抗匹配方式將發射天線與接收天線之間的傳輸效率進行提升,主要以不同天線結構所產生的磁場來量測天線的射頻電能傳輸效率,而為了再更進一步提升傳輸效率,還降低環境的磁阻來產生更大的磁場,並減少電磁散溢的情形,再量測微處理器與電子紙模組及整流升壓電路的消耗功率,推斷發射與接收天線間能使電子紙顯示資訊的最遠電能傳輸距離,作為本系統使用距離的規範。 We develop a related technologies of a monitor of a smart card (total thickness of less than 2mm) and its wireless charging technology, the wireless receiver in the monitor receive the data and energy from reader. When we swipe the card in the subway station, reading time is extremely short, so how to transfer energy enough to change the information of the monitor in such a short time is the focus of this project to solve. The smart card consists of the subject, E-paper, E-paper driver, radio frequency identification chip and the receiving unit. The E-paper module is configured in the subject, used to display content and information contained in the identification chip. E-paper driver is also configured in the subject and connected to the E-paper. The receiving unit receives information and energy to power on the E-paper driver, and to transfer information through identification chip to the E-paper driver. The E-paper driver displays information by the transmission data. This thesis estimates how many transmission power when users swipe the card within a short time to reach the energy E-paper driver needed. Technology of wireless transmission energy have been many research results, transmission and receiving energy should be feasible, but how to reduce the receiver's volume into the smart card while maintaining sufficient transmission power is bound to form two contradictory requirements. For transmission enough power, this thesis improves the transmission efficiency between the antennas by antenna design and impedance matching circuit. This thesis mainly used magnetic fields generated from different antenna structures to measure the RF power transmission efficiency of the antennas. In order to improve the transmission efficiency, we reduce the reluctance of the environment to generate a larger magnetic field and to reduce electromagnetic dispersion. Then we measure the power consumption of microprocessors, E-paper module and voltage multiplier. By the result we can determine the most distance between transmit and receive antennas to transfer power is enough to display information on the E-paper module. This is the distance of the specification for this smartcard display system. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64506 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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