A power adapter hub is provided, comprising: an AC input port; a power supply circuit coupled to the AC input port for receiving AC power and having a maximum rated output power; and a plurality of output ports coupled to the power supply circuit for supplying DC power to external devices. Upon determining that the total power to be supplied might exceed the maximum rated output power, a DC power supplied through at least one of the output ports is modified, and the modified DC powers are set to ensure that the supplied power does not exceed the maximum rated output power.