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研究生:周書平
研究生(外文):Su-Ping Chou
論文名稱:串聯電池組之平衡放電
論文名稱(外文):Balance Discharging for Series Connected Batteries
指導教授:莫清賢莫清賢引用關係
指導教授(外文):Chin-Sien Moo
學位類別:碩士
校院名稱:國立中山大學
系所名稱:電機工程學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:63
中文關鍵詞:平衡放電串聯電池組數位訊號處理器返馳式轉換器
外文關鍵詞:flyback converterbalance dischargeseries-connected batteryDSP
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由於串聯電池組中個別電池的充放電特性並不一致,導致電量不平衡,造成過度充電或過度放電,因而無法充分利用電池組的蓄電能力,甚至縮短了電池的壽命。雖然平衡充電已經有相當多的討論,但尚未見關於放電時電量平衡的研究。
本文針對串聯電池組提出以返馳式轉換器為基礎的電路架構與放電策略,在提供穩定輸出電壓外,同時具有平衡放電的功能。電路由一個多繞組輸入的返馳式變壓器所構成,串聯電池組中的每一顆電池都連接到變壓器一次側繞組,將能量轉移至二次側的負載。藉著對主動開關的控制,發展出數種不同的放電策略,期望能依照剩餘電量的多寡來決定各個電池供電給負載的比例,以儘速達到電量平衡的目的。此外,藉由對剩餘容量持續地監控,可將用盡儲能的電池終止放電,避免個別電池的過度放電。
本文採用數位訊號處理器(Digital Signal Processor, DSP)作為控制與運算的核心,隨時監測電池電壓與調整功率開關的導通率,以調節個別電池能量的釋放,達成平衡放電的目的,以及對負載端進行穩壓的功能。
本文以一個由四顆12V鉛酸電池串聯的電池組作為電路設計實例,藉以說明平衡放電電路的動作原理與工作模式,經由實際對三種不同平衡放電策略進行實驗,來驗證平衡策略與架構的可行性。
Charge imbalance may happen to series-connected batteries during charging or discharging due to the discrepancies among batteries. The charge imbalance will cause some batteries being over-charged or over-discharged and is harmful to the battery cycle-life. Moreover, the storage capacity of the battery bank will not be effectively utilized. This thesis brings forth first the concept of charge equalization on discharging for battery banks.
Various control strategies are implemented on a flyback converter with a multi-input transformer to provide the balance discharging function as well as output voltage regulation. Each battery of the battery bank is connected to a primary winding of the transformer via an active power switch. The batteries transfer their energy to load according to the residual energy in each battery. Meanwhile, by continually monitoring battery voltages, exhausted batteries can be disconnected to avoid being over-discharged.
A battery bank with four series-connected lead-acid batteries is used as an example to illustrate the operation of the balance discharging circuit. The complicated calculations and precise control are accomplished by a digital signal processor (DSP). The experimental results advocate the applicability of the discharging circuit and control strategies.
摘要
Abstract
目錄
圖表目錄
第一章 緒論
1-1 研究背景
1-2 研究動機與目的
1-3 本文大綱
第二章 平衡放電
2-1 鉛酸電池損壞的原因
2-2 串聯電池組電量平衡及其影響
2-3 平衡放電的方式與輸出電壓的調整
第三章 平衡放電電路
3-1 電路架構
3-2 電路的操作方式
3-3 電路參數設計
第四章 電路的控制及平衡放電策略
4-1電池電壓的量測
4-2 控制電路
4-2-1 電壓偵測電路
4-2-2驅動電路
4-3 平衡放電策略
4-3-1 策略一
4-3-2 策略二
4-3-3 策略三
4-4 軟體規劃
第五章 實驗量測
5-1 電路參數設定
5-2 實驗量測
5-2-1 策略一的平衡放電
5-2-2 策略二的平衡放電
5-2-3 策略三的平衡放電
5-2-4 輸出電壓量測
第六章 結論與未來研究方向
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