Patent ID: 7787229

Claim:
A CPU (central processing unit) power control circuit comprising: a temperature detection circuit connected to a CPU to detect temperature of the CPU and output a control signal; a power supply circuit connected to the temperature detection circuit, and the CPU to supply power to the CPU; the power supply circuit comprising: a voltage regulator module (VRM) chip comprising an input pin connected to the temperature detection circuit to receive the control signal, a first output pin, a second output pin, and a phase pin; a first transistor comprising a gate connected to the first output pin of the VRM chip, a drain connected to a first power supply, and a source connected to the phase pin of the VRM chip; a second transistor comprising a gate connected to the second output pin of the VRM chip, a drain connected to the phase pin of the VRM chip, and a source grounded; an inductor comprising a first terminal connected to the phase pin of the VRM chip and a second terminal connected to the CPU to supply power to the CPU; and a first capacitor connected between the second terminal of the inductor and the ground; a discharge circuit comprising: a first switch connected to the input pin of the VRM chip to receive the control signal from the temperature detection circuit, to control turn on or off of the first switch; and a second switch arranged to connect the second terminal of the inductor and ground under the control of the turn on or off of the first switch; when the temperature of the CPU exceeds a safe temperature, the temperature detection circuit outputs the control signal to the input pin of the VRM chip to stop the VRM chip from working thereby to stop supplying power to the CPU, and power from the inductor and the first capacitor is discharged via the second switch.