Abstract: A power management system and hierarchical power switches and sockets thereof are mainly used to divide power source of one area into multiple ratings, and to layup supply lines and set the hierarchical power switches and the control switch based on this rating, thus to control the supply state of each service rating in the area by the using of the hierarchical power switches and the control switch, and then form hierarchical management mechanism to achieve the effect of the energy conservation, improve the security of the electric power system at the same time; The hierarchical power sockets are set on the ends of the supply lines, and the load device can be provided to select the connection the supply line in different service rating, achieving the energy conservation of hierarchical power management and the security of regional electricity supply.

Abstract: A composite port connection device, and is provided with a plurality sets of connection ports for the user to connect them to various types of electronic devices. The connection ports include power output port and data transmission port. The major function of the invention is that, upon receiving the local power supply and data signals at input terminal, the power supply and the data signals are processed separately and independently, then they are connected to the related output ports respectively. Thus, the device enables a user to connect each of the respective output ports to each of the various electronic devices, hereby achieving the objective of providing power supply and realizing data transmission.