Patent ID: 8255729

Claim:
A time sequence control circuit for controlling a first voltage received by a power supply receiving terminal of a motherboard of a computer greater than a preset voltage before a signal control terminal on the motherboard receives a second voltage during turning on the computer, the control circuit comprising: a control circuit connected to the power supply receiving terminal to receive the first voltage; a delay circuit connected to the control circuit; and a power conversion circuit connected between the delay circuit and the signal control terminal, to convert the first voltage into the second voltage; wherein the control circuit comprises first and second diodes, and first and second electronic switches, anodes of the first and second diodes are connected to the power supply receiving terminal, a cathode of the first diode is grounded via first and second resistors connected in series, a cathode of the second diode is connected to the delay circuit, a first terminal of the first electronic switch is connected to a node between the first and second resistors, a second terminal of the first electronic switch is grounded, a third terminal of the first electronic switch is connected to a first terminal of the second electronic switch, and is also connected to the power supply receiving terminal via a third resistor, a second terminal of the second electronic switch is grounded, a third terminal of the second electronic switch is connected to the delay circuit; when the computer is turned on, the first voltage increases to the preset voltage, the first terminal of the first electronic switch is at high level, the first electronic switch is turned on, the first terminal of the second electronic switch is at a low level, and the second electronic switch is turned off; and wherein when the computer is turned on, the power supply receiving terminal increases to the preset voltage, the control circuit is turned off, the power conversion circuit converts the first voltage into the second voltage and provides the second voltage to the signal control terminal after delaying for a period of time.