Patent ID: 9471122
Filing Date: 2016-10-18
CPC Classification: G06F

Claim Text:
1. A power supply circuit for supplying power to a central processing unit (CPU) of a computer, the power supply circuit comprising: a pulse width modulation (PWM) controller comprising a first output terminal, a second output terminal, and a current pin; a control circuit connected to the second output terminal of the PWM controller; a switch circuit connected to the control circuit; a first current protection circuit connected to the current pin of the PWM controller and the control circuit; a second current protection circuit connected to the switch circuit and the current pin of the PWM controller; a first power circuit connected to the first output terminal of the PWM controller and the CPU; and a second power circuit connected to the second output terminal of the PWM controller and the CPU; wherein when the computer is turned on, the first and second power circuits operate, the control circuit receives a pulse signal from the second output terminal of the PWM controller and converts the pulse signal to a direct current (DC) voltage, compares the DC voltage with a preset voltage, and outputs a first control signal to the switch circuit and the first current protection circuit, the switch circuit is turned on and the second current protection circuit is turned off, the first current protection circuit is turned on, and a first current protection threshold is set by PWM controller through the first current protection circuit; and when the computer in a standby mode, the first power circuit operates and the second power circuit does not operate, the control circuit does not receive a pulse signal from the PWM controller and outputs a second control signal to the switch circuit and the first current protection circuit, the switch circuit is turned off and the second current protection circuit is turned on, the first current protection circuit is turned off, and a second current protection threshold is set by PWM controller through the second current protection circuit.