关键词：锂电池 USB供电端口 微处理器 恒压恒流 PWM
With the development of electronic technology, portable equipments are playing a important role, and a pint-sized portable cellphone charger will bring the convenience and pleasure to people’s life.
The principle，character and charging method of Li-ion and Li-polymer battery are illuminated in the paper, and different impacts on the performance of battery in different charging methods and the situation of use of cellphone charger are analyzed in detail based on which, an intelligent charger IC for generic Li-ion or Li-polymer battery on the market which is controlled by mcroprocesser is necessary to be designed.
USB port is selected for supplying power with the system, and the charger is charged by making use of A/D conversion and PWM control in CC/CV mode. The principle and method of the design are also illuminated in this paper, when the hardware is successful to execute and modulate, the job is finished.
Keyword: Li-ion or Li-polymer battery power supply CC/CV P89LPC925 PWM