Patent ID: 8850233

Claim:
A multi-phase voltage regulator module (VRM) system, used in a CPU, comprising: a VRM connected to the CPU, wherein the VRM outputs a load detecting voltage, and the load detecting voltage is in direct proportion to an actual load of the CPU; and a phase control circuit connected to the VRM, comprising: a first switch circuit, coupled to the VRM; a second switch circuit, coupled to the VRM; and a load detecting circuit, coupled to the first switch circuit, the second switch circuit and the VRM, wherein the load detecting circuit receives the load detecting voltage from the VRM, and a voltage delay effect is applied by the phase control circuit, wherein the multi-phase VRM system outputs a core voltage having different phases to the CPU according to the actual load, the phase control circuit outputs a first level phase switching signal to the VRM when the load detecting voltage increases to a first voltage, and the core voltage outputted by the VRM to the CPU is changed from N phases to M phases after the VRM receives the first level phase switching signal; the phase control circuit outputs a second level phase switching signal to the VRM when the load detecting voltage decreases to a second voltage, and the core voltage outputted by the VRM to the CPU is changed from M phases to N phases after the VRM receives the second level phase switching signal, such that a change of the core voltage is delayed by the load detecting circuit in response to the actual load, the first voltage is higher than the second voltage, and M is larger than N.