Patent ID: 8331117

Claim:
A balance system for multiple power supplies located on a circuit board, comprising: a plurality of power supply circuits each including a first power output route and a power supply feedback unit, the power supply feedback unit including a reference level terminal to determine output potential of one of the plurality of power supply circuits; a second output route electrically connected to the first power output route of each of the plurality of power supply circuits to converge current sending to a load; a proportion distribution circuit which includes a variable impedance element electrically connected to the reference level terminals, and an output feedback unit respectively connected to the variable impedance element and the second output route; and wherein the variable impedance element is controllable to change proportionally equivalent impedance connected to the reference level terminals, and wherein the output feedback unit detects the current from the second output route to generate a voltage signal which causes the reference level terminals to generate currents, the power supply feedback unit being triggered respectively by the currents to change the output potential of each of the plurality of the power supply circuit at the same time and same ratio.