Patent ID: 8583950
Filing Date: 2013-11-12
Classification: G06F

Abstract:
1. A power supply circuit for a CPU comprising: a CPU; a power supply; a plurality of voltage adjustment modules; a module management unit for receiving an operating mode signal from the CPU, and transforming the operating mode signal to a switch signal; a plurality of resistivity selection modules for receiving the switch signal, thereby selecting a voltage divider resistor; and a pulse width modulator for changing the operation status of the voltage adjustment modules, and enabling the voltage adjustment modules to provide adequate voltage to the CPU in response to the operating mode signal received from the CPU; the power supply is grounded through the first inductor and a first capacitor, a node between the first inductor and the first capacitor is connected to the resistivity selection modules; each of the resistivity selection modules includes an electronic switch, a first resistor, a second resistor, a third resistor, and a fourth resistor, a signal input terminal of the electronic switch is connected to the module management unit, a current input terminal of the electronic switch is connected to a node between the first capacitor and the first inductor, a first power source terminal is connected to the power supply through the fourth resistor, an inhibition terminal, a second power source terminal and a third power source terminal of the electronic switch are connected to the ground; wherein a first output terminal of the electronic switch is directly connected to the drain of the upper bridge MOSFET, a second output terminal, a third output terminal, and a fourth output terminal of the electronic switch are connected to the drain of the upper bridge MOSFET through the first resistor, the second resistor, and the third resistor, respectively, other four output terminals are idle.