TWI513188B - Power supply circuit for pci-e slot - Google Patents

Description

PCI-E slot power supply circuit

The invention relates to a PCI-E slot power supply circuit.

The PCI-E (Peripheral Component Interconnect Express) slot on the motherboard requires a 3.3V_Dual power supply. This power supply is powered by the S5 (Soft shutdown) state. Therefore, the PCI-E slot is equipped with a PCI-E device. This will cause the system to consume additional power in the S5 state, sometimes exceeding the Eup-certified energy-saving requirements (Eup certification requires that the system consume no more than 1W in the S5 state).

In view of the above, it is necessary to provide a power supply circuit that does not supply power to the PCI-E slot when the motherboard is in the S5 state.

A PCI-E slot power supply circuit includes a control chip, a first electronic switch and a second electronic switch. The control chip is configured to determine a working state of a motherboard and output a control signal according to the first electronic The first end of the switch is connected to the control chip to receive the control signal, and the first end of the first electronic switch further receives a 3.3V dual power supply from the motherboard through a first resistor, the first electronic switch The second end is grounded, the third end is connected to the first end of the second electronic switch, and the 3.3V dual power supply is received through a second resistor, and the second end of the second electronic switch receives the 3.3V dual power supply, The three ends are connected to a PCI-E slot.

The PCI-E slot power supply circuit can stop power supply to the PCI-E slot when the motherboard is in the S5 state through the control chip and the two electronic switches.

Referring to FIG. 1, a preferred embodiment of the PCI-E socket power supply circuit of the present invention includes a control wafer, a first field effect transistor Q1 and a second field effect transistor Q2.

The gate of the first field effect transistor Q1 is connected to the control chip for receiving the control signal PCIE_PWR_CTL from the control chip, and the gate is also connected to the 3.3V dual power supply +3.3V_DUAL through a resistor R1, the first The source of the field effect transistor Q1 is grounded, the drain is connected to the gate of the second field effect transistor Q2, and is also connected to the 3.3V dual power supply +3.3V_DUAL through the resistor R2, the second field effect transistor Q2 The drain is connected to a PCI-E slot 5, and the source is connected to the 3.3V dual power supply +3.3V_DUAL.

In this embodiment, the control chip is a Super I/O chip 6 on the motherboard, which determines the operating state of the motherboard and outputs the control signal PCIE_PWR_CTL accordingly.

When the motherboard is in the S5 state, the Super I/O chip 6 outputs a low level control signal PCIE_PWR_CTL, thereby disconnecting the first field effect transistor Q1, further causing the second field effect transistor Q2 to be disconnected. That is, the PCI-E slot 5 no longer receives the 3.3V dual power +3.3V_DUAL. At this time, the PCI-E device connected to the PCI-E slot 5 no longer operates.

When the motherboard is in the S0-S4 state, the Super I/O chip 6 outputs a high level control signal PCIE_PWR_CTL, thereby turning on the first field effect transistor Q1, further turning on the second field effect transistor Q2. That is, the 3.3V dual power supply +3.3V_DUAL supplies power to the PCI-E slot 5.

It can be seen from the working principle that the first field effect transistor Q1 and the second field effect transistor Q2 function as electronic switches in the circuit. Therefore, in other embodiments, the first field effect transistor Q1 and the second The field effect transistor Q2 can also be replaced by other types of transistors, and even other electronic components having electronic switching functions. For example, when a transistor is used in place of the first field effect transistor Q1, the base of the transistor corresponds to the gate of the first field effect transistor Q1, and the collector of the transistor corresponds to the first field effect. The drain of the transistor Q1 and the emitter of the transistor correspond to the source of the first field effect transistor Q1. The electronic switch includes a first end, a second end and a third end. The first end is configured to receive the PCI-E control signal PCIE_PWR_CTL to control the conduction and disconnection of the second end and the third end, and the second end Grounded, the third end is connected to the 3.3V dual power supply +3.3V_DUAL through resistor R2.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

Q1. . . First field effect transistor

Q2. . . Second field effect transistor

R1, R2. . . resistance

5. . . PCI-E slot

6. . . Super I/O chip

1 is a circuit diagram of a preferred embodiment of a PCI-E slot power supply circuit of the present invention.

Q1. . . First field effect transistor

Q2. . . Second field effect transistor

R1, R2. . . resistance

5. . . PCI-E slot

6. . . Super I/O chip

Claims (4)

A PCI-E slot power supply circuit includes a control chip, a first electronic switch and a second electronic switch. The control chip is configured to determine a working state of a motherboard and output a control signal according to the first electronic The first end of the switch is connected to the control chip to receive the control signal, and the first end of the first electronic switch further receives a 3.3V dual power supply from the motherboard through a first resistor, the first electronic switch The second end is grounded, the third end is connected to the first end of the second electronic switch, and the 3.3V dual power supply is received through a second resistor, and the second end of the second electronic switch receives the 3.3V dual power supply, The three ends are connected to a PCI-E slot. The PCI-E slot power supply circuit of claim 1, wherein the first electronic switch is a field effect transistor, and the gate of the field effect transistor corresponds to the first end of the first electronic switch, The source of the field effect transistor corresponds to the second end of the first electronic switch, and the drain of the field effect transistor corresponds to the third end of the first electronic switch. The PCI-E slot power supply circuit of claim 1, wherein the second electronic switch is a field effect transistor, and the gate of the field effect transistor corresponds to the first end of the second electronic switch, The source of the field effect transistor corresponds to the second end of the second electronic switch, and the drain of the field effect transistor corresponds to the third end of the second electronic switch. The PCI-E slot power supply circuit of claim 1, wherein the control chip is a Super I/O chip.