Patent ID: 8531060

Claim:
A portable electronic device, comprising: a system end including a backup power device and a battery for providing a trigger signal, wherein the battery and the backup power device is coupled to a trigger circuit and the trigger signal is provided by the backup power device, and the system end comprises: the trigger circuit for providing the trigger signal; and a power module coupled to the trigger circuit for providing electric power to the trigger circuit, wherein the battery is in the power module; wherein the backup power device coupled to the trigger circuit for providing electric power to the trigger circuit; wherein the power module further comprises: a primary power device coupled to the backup power device for receiving the output DC voltage, providing electric power to the system end, and charging the backup power device; and an adapter for converting an input AC voltage into an output DC voltage and providing the output DC voltage to the system end; when the adapter is connected to the system end, the trigger signal turns on the adapter; when the adapter is disconnected from the system end, the adapter detects an absence of the trigger signal and turns off.