随着计算机以及与USB相关便携式设备的发展，USB接口也得到了极大的普及。数据传输、对锂电池充电是目前应用范围比较广的USB接口技术。本文设计了一种USB电源自动检测的自适应电路：连接AC适配器执行快速充电并且给系统供电；连接PC等标准USB设备以最大500mA电流充电，同时可进行数据传输。%With the development of computer and the USB portable device, USB interface has also been a great deal of popularity. Now, the USB interface technology of data transmission and charge for the Li-Ion Battery is used widely. This paper presents an adaptive circuit, which can detect the USB power automatically. If an AC adapter is connected to the system, it works as rapid charging and power supply. And if the PC or other standard USB device is connected, it is used to data transmission and charging with the maximum current value of 500mA.
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