Patent ID: 8400794

Claim:
A power system, comprising: a voltage sharing bus used to transmit a sharing voltage; and a plurality of power supply units electrically connected in parallel and used to provide power to a loading, wherein each of the power supply units is electrically connected to the voltage sharing bus to receive the sharing voltage, and comprises: a power converter electrically connected to a power source and the loading; a resistor electrically connected to a input terminal of the power converter; a first comparator used to generate a current reference value in accordance with the difference between the sharing voltage and an input voltage of the power converter, wherein the first comparator is electrically connected to the resistor and the input terminal, and one end of the voltage sharing bus is electrically connected between the resistor and the first comparator; a current detector used to detect an output current value of the power converter; and a second comparator used to generate the current compensation value in accordance with the difference between the output current value and the current reference value thus that the power converter adjusts the output current value thereof in accordance with the current compensation value.