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研究生(外文):Shao-Che Su
論文名稱(外文):Fast charging technique for Li-Ion Battery with charging current window Based on Ripple-Based Control
指導教授(外文):Chen-Hao Chang
口試委員(外文):Hong-chin LinHou-Ming Chen
外文關鍵詞:Fast Charging
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In recent years, electronic portable devices such as smartphones and tablets have become ubiquitous. Battery-powered portable equipment requires fast charging for ease of use, and this thesis presents the design of the charger for fast and battery-protected conditions.
Considering the design of the charging system, there are usually two kinds, one is the low-voltage linear regulator structure, and the second is the switching -based regulator structure. The former has the advantage of no ripple voltage and high precision, but when the battery with low-voltage level has a large conduction loss, so the efficiency is low. In contrast, switching-based regulator has higher efficiency. Although there is extra ripple voltage, in the acceptable range, this thesis chooses this charging method to design. The modulation method adopts the pulse frequency modulation for design, and there is a shortcoming of the average current drop. Therefore, this thesis proposes an improvement method against this shortcoming. When using 1000μF capacitor and 1A charging current, the charging time reduces about 4% and the oscillation caused by switching the small current mode to the large current mode is improved. The improved circuit further increases the detection speed of the inductor current detecting circuit by 50% and the current ripple is reduced by 42%. Thus, the overall charging time decreases by 5%.
In the choice of battery, lithium-ion battery is used. Because this material has high energy density and high operating voltage, this thesis designs for the demand of lithium-ion battery. The lithium-ion battery will change the internal resistance in different temperature, electric quantity, charging current and charging cycle times, and the internal resistor detecting circuit can make the circuit perform long-time high-current charging. Without over-charging, it can achieve faster charging. In this thesis, the internal resistor detector can speed up the charging speed by about 5%. Thus, the total charging time decreases about 10% and the charging efficiency can be maintained at 91% with the maximum charging current of 0.6 A. A charging efficiency of 89% can be maintained in the case of 1 A.
誌謝 i
中文摘要 ii
Abstract iii
目錄 iv
圖目錄 v
表目錄 vii
第 1 章 緒論 1
1.1 研究背景與動機 1
1.2 論文架構 2
第 2 章 鋰離子電池與充電器概論 3
2.1 鋰離子電池特性及充電簡介 3
2.1.1 鋰離子電池 3
2.1.2 鋰離子電池充電策略 9
2.2 快速充電器基本概念介紹 11
2.2.1 線性快速充電器 11
2.2.2 切換式快速充電器 12
第 3 章 漣波電壓控制具充電電流窗口鋰電池快速充電技術 16
3.1 Dead time Generation 16
3.2 Module Selector 17
3.3 Current Window Controller 20
3.3.1 Proposed Current Sensor 21
3.3.2 On-Off Time Generator 28
3.4 晶片量測結果 29
第 4 章 內阻偵測電路 37
第 5 章 結論與未來展望 42
參考文獻 43
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