Charge Equalization for Series-Connected Batteries

博士 === 國立中山大學 === 電機工程學系研究所 === 92 === Charge equalization is a major issue in the service of batteries since they are frequently connected in series to obtain higher output voltage levels for most applications. With series connection, imbalance may happen to the operating batteries during either ch...

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Main Authors: Yao-ching Hsieh, 謝耀慶
Other Authors: Chin-sien Moo
Format: Others
Language:en_US
Published: 2004
Online Access:http://ndltd.ncl.edu.tw/handle/48132474775571365926
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spelling ndltd-TW-092NSYS54420032015-10-13T13:05:08Z http://ndltd.ncl.edu.tw/handle/48132474775571365926 Charge Equalization for Series-Connected Batteries 串聯電池組之電量平衡 Yao-ching Hsieh 謝耀慶 博士 國立中山大學 電機工程學系研究所 92 Charge equalization is a major issue in the service of batteries since they are frequently connected in series to obtain higher output voltage levels for most applications. With series connection, imbalance may happen to the operating batteries during either charging or discharging periods. The imbalance among batteries concerns the operating efficiency and the battery lifetime. The main object of this dissertation is to solve the problem of charge inequality. The importance of charge equalization is first addressed. The problem is demonstrated by experiments of charging/discharging processes. Then, the techniques of battery charging and charge equalization are reviewed. To improve charge equalization, a dynamic balance charging scheme is developed on the basis of buck-boost conversion. The balance charging scheme can be realized by two configurations, that is, “forward allotting” or “backward allotting” configurations. The circuits are composed of several duplicated subcircuits and operated by digital control kernel, therefore, they are easy to be applied on battery sets with different numbers of batteries. By dynamically re-allocating the energy drawing from satiated batteries and allotted to hungry ones, the series-connected batteries can reach balance state more efficiently. The balance charging circuits can be employed during off-line or even discharging. However, on observing that the output voltage will vary in a big range when the battery set is discharged, the charge equalization can be integrated with voltage regulation on the output. Evolve from this idea, a balance discharging circuit topology based on multi-winding transformer is proposed. The experiments in this dissertation are carried out on lead-acid batteries, therefore, the reactions and characteristics of lead-acid batteries are discussed. However, the proposed circuits are not restricted to be applied on lead-acid batteries only. Experimental results confirm the theoretical analyses and manifest the effectiveness of the designed circuits. Chin-sien Moo 莫清賢 2004 學位論文 ; thesis 90 en_US
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description 博士 === 國立中山大學 === 電機工程學系研究所 === 92 === Charge equalization is a major issue in the service of batteries since they are frequently connected in series to obtain higher output voltage levels for most applications. With series connection, imbalance may happen to the operating batteries during either charging or discharging periods. The imbalance among batteries concerns the operating efficiency and the battery lifetime. The main object of this dissertation is to solve the problem of charge inequality. The importance of charge equalization is first addressed. The problem is demonstrated by experiments of charging/discharging processes. Then, the techniques of battery charging and charge equalization are reviewed. To improve charge equalization, a dynamic balance charging scheme is developed on the basis of buck-boost conversion. The balance charging scheme can be realized by two configurations, that is, “forward allotting” or “backward allotting” configurations. The circuits are composed of several duplicated subcircuits and operated by digital control kernel, therefore, they are easy to be applied on battery sets with different numbers of batteries. By dynamically re-allocating the energy drawing from satiated batteries and allotted to hungry ones, the series-connected batteries can reach balance state more efficiently. The balance charging circuits can be employed during off-line or even discharging. However, on observing that the output voltage will vary in a big range when the battery set is discharged, the charge equalization can be integrated with voltage regulation on the output. Evolve from this idea, a balance discharging circuit topology based on multi-winding transformer is proposed. The experiments in this dissertation are carried out on lead-acid batteries, therefore, the reactions and characteristics of lead-acid batteries are discussed. However, the proposed circuits are not restricted to be applied on lead-acid batteries only. Experimental results confirm the theoretical analyses and manifest the effectiveness of the designed circuits.
author2 Chin-sien Moo
author_facet Chin-sien Moo
Yao-ching Hsieh
謝耀慶
author Yao-ching Hsieh
謝耀慶
spellingShingle Yao-ching Hsieh
謝耀慶
Charge Equalization for Series-Connected Batteries
author_sort Yao-ching Hsieh
title Charge Equalization for Series-Connected Batteries
title_short Charge Equalization for Series-Connected Batteries
title_full Charge Equalization for Series-Connected Batteries
title_fullStr Charge Equalization for Series-Connected Batteries
title_full_unstemmed Charge Equalization for Series-Connected Batteries
title_sort charge equalization for series-connected batteries
publishDate 2004
url http://ndltd.ncl.edu.tw/handle/48132474775571365926
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AT xièyàoqìng chuànliándiànchízǔzhīdiànliàngpínghéng
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