US Patent 9864714 Electronic system for performing recharging and data communication

An electric system includes a transmission line, a first and a second electronic devices, wherein the second electronic device selectively electrically connects to an external power. The transmission line includes a first connection terminal, a second and a third connection terminal, wherein the third connection terminal selectively electrically connects to the external power. The first electronic device includes a first electrical connection portion and a detection module. The first electrical connection portion electrically connects to the first connection terminal of the transmission line. The detection module connects to the first electrical connection portion, to determine whether the second connection terminal of the transmission line is electrically connected to the second electronic device, and determine whether the third connection terminal of the transmission line is electrically connected to an the external power, and performs an operation according to a connection status of the second connection terminal and the third connection terminal.