具二次側追蹤定位及自動節能之無線充電系統設計

Abstract

This research based on the structure of resonance magnetic field energy transmission proposes a wireless charging system applied in portable electronic devices. The system focuses on power saving and secondary locating. Furthermore, it also combines the microcontroller and wireless communication module for charging system control and management. Due to the reason of single orientation, the wireless charging system can not charge devices in other directions. As a result, the system adopts infrared and step motor in the primary coil to locate the secondary device. For different charging distances, the system makes use of auto power saving to control the levels of primary power. The function of power scaling in the system can be divided into three levels. Each level can provide proper energy for the secondary devices at different positions. The maximum power efficiency is 19.86 %, and the secondary receiving power is 136.64 mW at 10 cm. Besides, in order to achieve the optimal performance of the locating function, the secondary device is put in the range of 20 to 140 degrees, and the error of the locating function is below 6 degrees.

Date of Award	2009
Original language	Chinese (Traditional)
Supervisor	Chih-Lung Lin (Supervisor)