Patent ID: 8508198

Claim:
A power supply conversion circuit of a multi-phase power supply, comprising: a pulse width modulation chip; a plurality of sub-circuits, and each of the sub-circuits comprising: an inductor; a first capacitor; a first resistor connected in series with the first capacitor to form a branch parallel to the inductor in each sub-circuit; a second capacitor connected to the ground; a second resistor having two ends, one end connected to the connection between the first resistor and the inductor, the other end connected to the second capacitor in series; a differential pair comprising: a first differential signal trace having one end connected to the connection between the first resistor and the first capacitor, and another end connected to a current detecting terminal of the pulse width modulation chip; a second differential signal trace having two ends, one end connected to the connection between the second resistor and the second capacitor, the other end connected to another current detecting terminal of the pulse width modulation chip; wherein the ratios of the capacitances of each two second capacitors are same to that of the lengths of traces in each two corresponding differential pairs.