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Research of Battery Charging System with DSP

Author: YaoAiZuo
Tutor: LiuMingLan
School: Wuhan University of Technology
Course: Control Theory and Control Engineering
Keywords: Charger Residual power detection Are Recharger DSP
CLC: TM910.6
Type: Master's thesis
Year: 2006
Downloads: 817
Quote: 9
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Abstract


Lead-acid batteries for its mature technology, low cost, is the most widely used batteries. Currently in electric vehicles, UPS uninterruptible power supply and other areas, it has become the most important one of the key system components. As the battery charge and discharge of the electrochemical process is a complex, even though many battery manufacturers claims float life of 10 years, in practical application, a simple way due to the charge, float life of these batteries is less than the actual nominal half life. In actual application, a plurality of these batteries are often connected in series, so that the recent years, the quality of urban air and the earth oil crisis, are becoming increasingly attention. To protect the environment, save energy, the worldwide electrical energy in the battery as in transportation, communications equipment and other departments, has been widely used. Discharge will occur when imbalances, resulting in some loss of battery capacity, life expectancy is shorter. When a group of cells in a single or a few monomer damaged battery applications customers are often unable to determine which battery cell fails, it can only be a whole battery replacement, causing a lot of waste. In this thesis, several commonly used battery chemistry from the principle of charging and discharging characteristics and the work that will be encountered in the use of some of the main issues to proceed, battery management system introduced several major components - charge and discharge management, capacity forecasts, balancing charge, detailed analysis of the existing theories and methods, a detailed analysis of the theoretical basis of the relevant management methods. For a simple and practical method has been improved fast charging, high current charging stage to join in the fuzzy control and optimize the charging curve, thus ensuring fast and safe battery charging. On the same time, the study also designed a DSP as the core of the intelligent battery charger. This system is charged by the charging circuit and the path are constituted and with fuzzy charging method to charge the battery. In the residual battery detection accuracy and cost into consideration, a more precise determination of the internal resistance of the battery residual capacity is estimated. The charger system can achieve rapid and within 6-8 hours of uniform charging purposes. And because the use of fuzzy appropriate charging method according to the battery voltage, charge and temperature differences, given different levels of charging current; coupled device can regulate both charge the battery voltage level, so will not cause damage to the battery situation occurs, thereby protecting battery; the residual portion is because of the internal resistance of battery is affected by ambient temperature, battery internal resistance, battery aging factors such as the influence of the output current has changed, so long as the internal resistance measurement can be very accurate estimation of the battery capacity.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > General issues > Charging method,charging equipment
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