Patent ID: 8482265

Claim:
A current balance circuit, comprising: a first branch, comprising a first switch with a control pole and a first resistor connected in series between a power supply unit and at least one load; a second branch, comprising a second switch with a control pole and a second resistor connected in series between the power supply and the at least one load; a current feedback and comparison circuit, connected to the first resistor and the second resistor in parallel, to detect and compare currents flowing through the first branch and the second branch; a triangle and reversed triangle wave generator, to generate triangle waves and reversed triangle waves; a first multiplexer, comprising a first input terminal, a second input terminal, a control terminal, and an output terminal, the first input terminal receiving the triangle waves, the second input terminal being suspended, and the output terminal outputting first control signals to the control pole of the first switch to control the first switch and connected to the ground via a first capacitor; a second multiplexer, comprising a first input terminal, a second input terminal, a control terminal, and an output terminal, the first input terminal of the second multiplexer receiving the reversed triangle waves, the second input terminal of the second multiplexer being suspended, and the output terminal of the second multiplexer outputting second control signals to the control pole of the second switch to control the second switch and connected to the ground via a second capacitor; and a gate signal control circuit, connected to the current feedback and comparison circuit, the first switch, the second switch, the triangle and reversed triangle wave generator, and the control terminals of the first multiplexer and the second multiplexer, to compare voltage of the control pole of the first switch with the triangle waves, compare voltage of the control pole of the second switch with the reversed triangle waves, and to control input switch of the first multiplexer and the second multiplexer according to the currents flowing through the first branch and the second branch to adjust impedance of the first switch and the second switch to balance the currents flowing through the first branch and the second branch.