Patent ID: 8060764

Claim:
A power supply converting circuit to supply first and second power supplies to a central processing unit (CPU) chipset, the power supply converting circuit comprising: a multi-phase pulse-width modulation (PWM) controller, operable to provide a plurality of first PWM signals and a second PWM signal, and receive a control signal from the CPU chipset to control output of the second PWM signal; a single-phase PWM controller, operable to provide a third PWM signal; a plurality of first voltage converting circuits, operable to receive the plurality of first PWM signals to output the first power supply to the CPU chipset; a second voltage converting circuit; a first electrical switch unit, operable to receive the second and third PWM signals, and receive the control signal from the CPU chipset to selectively output one of the second and third PWM signals to the second voltage converting circuit, such that the second voltage converting circuit selectively outputs one of the first and second power supplies to the CPU chipset; and a second electrical switch unit, operable to receive one of the first and second power supplies from the second voltage converting circuit, and receive the control signal from the CPU chipset to selectively output one of the first and second power supplies to the CPU chipset.