近年來，鋰離子電池已被大量使用在消費性產品的能量儲存上，例如：手機、筆記型電腦以及其他攜帶式產品，為了讓鋰離子電池發揮最大的效能，需要一個高充電效率的高品質充電器。
本文提出一個新型的鋰離子電池充電器。首先，根據剩餘容量的資訊來調整其充電電流，為了要加以改善充電效率，將電池溫差及電池溫差的變化率加入模糊控制器運算，進而微調充電電流。本文硬體及韌體架構部分將於文中詳細介紹，功率級電路採用同步整流降壓轉換器來實現，以及使用Microchip微處理器實現數位補償器、數位濾波器及剩餘容量充電法，並於個人電腦上使用LabVIEW人機介面實現模糊控制器。根據實驗結果，本文提出的充電法可以改善充電器的效能，並提升充電效率，相較於傳統CC-CV充電法，平均溫差下降31.24%，也能維持相近的充電時間。

Nowadays, lithium-ion batteries are playing a substantial role in energy storage solutions for modern-day consumer products such as mobile phones, laptop computers and other portable devices. In order to maximize the performance of lithium-ion batteries, an advanced charger is required. The desired functionalities of a high quality charger include high charging efficiency.
In this thesis, a novel Li-ion battery charger is proposed; the proposed charger first takes the state of charge (SOC) information into account and adjusts the charging current accordingly. In order to further improve the charging efficiency, a fuzzy-logic-control-based (FLC-based) technique is also employed. The proposed FLC takes the temperature rise and the gradient of temperature rise of battery into account, and fine-tune the charging current accordingly. The hardware and firmware parts of the proposed system are described in detail. In this thesis, the power stage is implemented using the synchronous-rectified buck converter. The digital compensator, digital filter and the SOC adaptive algorithm is implemented using the dsPIC digital signal controller from Microchip Corp; while the fuzzy logic controller is realized using the LabVIEW on a personal computer. In addition to the hardware, a graphical user interface is also presented in this thesis.
According to the experimental results, the charging efficiency of the proposed system can be increased and the performance of the proposed charger can be improved. Comparing to conventional CC-CV method, the proposed charging technique can reduce the average temperature rise for 31.24 % while maintaining similar charging time.

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