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Full Balance of Battery Pack in Series/Parallel Connection
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In recent years, people around the world pay more and more attention to environmental protection. This low-pollution Electric Vehicles become increasingly popular. The Electric Vehicles power source is the LiFePO4 battery pack. In order not to damage the LiFePO4 battery pack lifetime, there must be an efficient battery management system (BMS). A qualified BMS must has self-balance capacity and has the function of battery protection. Therefore, this research proposed BMS with the function described above. This system is with full balance of battery pack in series and parallel connection. Full balance contains discharging, charging, and static balance. The static balance means that battery pack reached voltage balance where is no external power supplied. The system during discharges the BMS not only balance all batteries, it also meet the require of output power. During charge, the BMS can adjust individually charging current based on each battery state. For the static balance mode, where battery with voltage is about to lower the cut-off voltage, the system will make other batteries to charge the battery. It is also to reduce the required time for dynamic balance. The system also can be used in any serial-parallel battery pack which allows multiple batteries discharge and charge simultaneously. The system is equipped with the battery protection function as well. Since the system output is DC power. This limits its practical applications. A DC to AC voltage connection is also included in this system so that it is able to offer AC voltage directly. This research uses a trigger circuit to sense the mains side of the zero-crossing point. It provides a tracking reference to the inverter output voltage.
|Appears in Collections:||電機工程學系所|
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