中图分类号：TM912；TM930.114；TP368.2；TP274 文献标志码：A 文章编号：1674-5124（2013）05-0068-04
New intelligent battery capacity detector based on 51 MCU
（Aviation Engineering Institute，Civil Aviation Flight University of China，Guanghan 618307，China）
Abstract: The new intelligent battery capacity detector based on 51 MCU is proposed for testing the battery capacity accurately. This device controls the battery discharge through the constant current circuit， and then the voltage value during its discharge process is measured and the signal is converted by A/D converter. After that， 51 MCU can give the discharge curve and calculate battery capacity accurately. Besides， the current charge state of the battery is figured out according to the voltage value in a quick mode. The result shows that the new capacity detector is with high accuracy and the measurement error is within 1%. Because of this characteristic， the new detector can quickly and accurately determine the remaining battery capacity， so it has high practicality and promotional value.
Key words: battery； capacity detection； MOSFET； quick measurement； 51 MCU