Radio-Frequency Powering for Batteryless Telemetry Systems

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 94 === Abstract The purpose of this thesis is to design the batteryless telemetry system which can transmit energy and return signals via a pair of coupled coils. The batteryless telemetry system comprises a transponder and a reader. The reader which uses a Class E inv...

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Bibliographic Details
Main Authors: Chi-Tze Tzeng, 曾紀澤
Other Authors: Chee-Fai Yung
Format: Others
Language:zh-TW
Published: 2005
Online Access:http://ndltd.ncl.edu.tw/handle/53064708665853897422
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Summary:碩士 === 國立臺灣海洋大學 === 電機工程學系 === 94 === Abstract The purpose of this thesis is to design the batteryless telemetry system which can transmit energy and return signals via a pair of coupled coils. The batteryless telemetry system comprises a transponder and a reader. The reader which uses a Class E inverter as power driver can transmit energy to transponder via electromagnetically coupled coils and simultaneously receives sensed signals with load-shift keying modulation returns from transponder. Moreover, the reader converts the series of sensed signals to digital data and transfers the digital data to host computer by RS-232 communication protocol for further data analyzing. In order to improve the efficiency of power delivery, the Class E inverter must operate in zero-voltage-switching to reduce switching loss. So, in this thesis, we discuss the conditions of zero-voltage-switching of Class E inverter and compare the effects of every component varying in the Class E circuit and then tune the switching frequency and the duty cycle. In the cause of wireless energy transmitting and signal feedback, we change the tuned inductor in Class E inverter into a pair of coupled coils. Also, we illustrate the effect of power delivered efficiency and coupling coefficient of the coupled coils when the geometry position of coils changes.