POWER SUPPLY SYSTEM

摘要

A power supply system wherein when the arithmetic amount of a processor is small, the clock frequency of a power supply controller is reduced, thereby reducing the loss of the power supply controller, thereby elongating the life of an electronic device battery. The power supply system has a processor (1); a power supply controller (31) and a VR (35) that serve as a switching regulator for supplying a power to the processor (1); a voltage command generator (11) and a clock command generator (16) that can change the operational voltage and clock frequency of the processor core of the processor (1); and a battery (34) that serves as an input DC power supply of the switching regulator. In the power supply system, when the arithmetic amount of the processor (1) is small, the clock frequency of the power supply controller (31) is reduced, thereby reducing the loss of the power supply controller (31), thereby elongating the life of the electronic device battery (34).