CN100458655C - Power supply detection circuit and detection method thereof - Google Patents

Abstract

The invention relates to a power supply detection circuit, suitable for the power supply of the host board, there is a circuit that needs to be supplied power to a central processing unit by a power supply on the host board, and convert the voltage value that the said power supply outputs into a predetermined voltage value by a DC converter in order to provide the power needed for said central processing unit, the power supply detection circuit includes: a detection circuit, electrically connected to the circuit that needs to supply power to the CPU by the power supply, for detecting whether the power supply outputs a first voltage value to the motherboard, and generating a control signal; and a controlled switch, electrically connected to the detection circuit and the second output terminal of the power supply, controlled by the control signal to switch the switch, and when the detection circuit does not detect the first voltage value, the second output terminal of the power supply provides a second voltage value to the dc converter. The invention can achieve the effects of reducing resource waste and reducing the cost required by a user when updating the computer configuration.

Description

A power detection circuit and detection method thereof

technical field

The invention relates to a power detection circuit used on a computer motherboard and a detection method thereof.

Background technique

With the progress of the technology era, computers are widely used in various fields, which mainly use a central processing unit (CPU) to cooperate with the motherboard to drive the operation of other peripheral equipment and the application of software. There are more and more requirements for the work and performance of the computer. How to make the functions that the computer can perform more and more sophisticated has always been the goal that the industry has been racking their brains to achieve.

Referring to Fig. 1, it is the structure schematic diagram of the Pentium IV central processing unit and its special-purpose ATX (Advanced Technology expanding) motherboard that Intel (intel) company recently released, because the performance and the speed function that central processing unit 10 can carry out are powerful, so It needs a larger amount of current to run sufficiently, so its dedicated ATX motherboard 11 has an additional power socket for 4 pins in addition to the original power socket 12 for 20 pins (pin). 13 is directly provided with 12 volt power by the power supply 14 for use by the central processing unit 10 . Among them, ATX is a motherboard specification formulated by Intel Corporation in 1995. Its main change is that the serial port and parallel port connectors are directly built into the motherboard, and the power supply also adopts an integrated design.

Since the previous power supply only provides 20 pins (pins) to supply power to the motherboard, and does not provide 12 volts to the 4 pins (pins) of the central processing unit 10, when the user replaces the computer with When developing a pentium IV CPU and its dedicated ATX motherboard, a dedicated power supply for the pentium IV must be used to drive the CPU and the motherboard. Therefore, the original power supply will be discarded, resulting in waste of resources and increased user updates. Cost required for computer provisioning.

Contents of the invention

The purpose of the present invention is to provide a power supply detection circuit and its detection method, so that a motherboard that needs to be powered exclusively by a power supply to a central processing unit can be driven without using its dedicated power supply. The central processing unit and the motherboard operate to reduce resource waste and reduce the cost required for users to update computer equipment.

The present invention is achieved like this. The invention provides a power detection circuit, which is suitable for the power supply of the main board. The main board has a circuit that needs to be powered by a power supply to a central processing unit, and the power is supplied by a DC converter. The voltage value output by the device is converted into a predetermined voltage value to provide the required power for the central processing unit. The power detection circuit includes: a detection circuit electrically connected to the circuit that needs to be powered exclusively by the power supply to the central processing unit to detect whether the power supply outputs a first A voltage value is sent to the motherboard, and a control signal is generated; and a controlled switch is electrically connected to the detection circuit and the second output terminal of the power supply, and is controlled by the control signal to switch the switch, and in When the detection circuit does not detect the first voltage value, the second output terminal of the power supply provides a second voltage value to the DC converter.

The detection circuit in the power detection circuit can use an inverter to detect whether the power supply is inputting the first voltage value and generate a control signal. The inverter can be a metal oxide semiconductor field effect Transistors (MOSFETs).

The first voltage value in the power detection circuit can be 12 volts.

The first voltage value in the power detection circuit can be output by the first output terminal of the power supply. The controlled switch in the power detection circuit can be a metal oxide semiconductor field effect transistor (MOSFET).

The second voltage value in the power detection circuit can be 5 volts.

The power detection method of the present invention is applicable to the power supply of a mainboard, and there is a circuit on the mainboard that needs to be powered by a power supply to a central processing unit, and the said power supply is converted by a DC converter. The voltage value output by the supply device is converted into a predetermined voltage value to provide the power required by the central processing unit, and the steps include: detecting whether the power supply device outputs a first voltage value to motherboard, and generate a control signal; the control signal controls the switching of a controlled switch, and when the first voltage value is not detected, the second output terminal of the power supply outputs a second voltage value to the Said DC converter.

In the power detection circuit, detecting whether the power supply outputs a first voltage value to the motherboard can be performed by a detection circuit.

In the power detection circuit, the detection circuit can use an inverter to detect whether the power supply inputs the first voltage value, and generate a control signal.

The inverter in the power detection circuit can be a metal oxide semiconductor field effect transistor (MOSFET).

The first voltage value of the power detection circuit can be 12 volts.

The first voltage value in the power detection circuit can be output by the first output terminal of the power supply.

The controlled switch in the power detection circuit can be a metal oxide semiconductor field effect transistor (MOSFET).

The second voltage value in the power detection circuit can be 5 volts.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Illustration

Figure 1 is a schematic diagram of the structure of the Pentium IV central processing unit and its dedicated motherboard.

FIG. 2 is a schematic diagram of a circuit structure in which the power detection circuit of the present invention fails to detect the first voltage value.

FIG. 3 is a schematic diagram of a circuit structure in which the power detection circuit of the present invention detects the first voltage value.

FIG. 4 is a flow chart of the power detection method of the present invention.

FIG. 5 is a circuit diagram of the power detection circuit of the present invention.

in the picture

10-central processing unit 11-mainboard 12-20-pin power socket

14-power supply unit 13-4-pin power socket 20-motherboard

21-central processing unit 22-power supply unit 23-direct converter

24-Detection circuit 241-Flip-flop 25-Controlled switch

26-4 pin (pin) power socket

Detailed ways

In order to make the ATX power supply with only 20 pins originally able to drive the Pentium IV central processing unit and its dedicated mainboard to operate, the present invention proposes a power detection circuit and a detection method thereof.

Referring to Fig. 2 and Fig. 3, it is a schematic diagram of the circuit structure under the situation that the power detection circuit of the present invention does not detect the first voltage value and has the first voltage value detected, and it is mainly applicable to Pentium IV in the central processing unit 21 Special motherboard 20 has a circuit that needs to provide 12 volts of voltage to the Pentium IV central processing unit 21 specially by a power supply 22 on this motherboard 20, and needs to be converted by this power supply by a DC converter 23 The voltage value output by the supplier 22 is converted into a predetermined voltage value (1.75 volts) to provide the power required for the operation of the Pentium IV central processing unit 21. The power detection circuit may include: a detection circuit 24 and a controlled switch 25.

The detection circuit 24 is electrically connected to the circuit that needs to provide a voltage of 12 volts to the Pentium IV central processing unit 21 through the power supply 22, and can be used to detect whether the power supply 22 outputs a first voltage. value (12 volts) to the motherboard 20 to provide the required power for the Pentium IV central processing unit 21, and generate a control signal. As for the controlled switch 25, it is electrically connected to the detection circuit 24 and the second output end of the power supply 22, and is controlled by the control signal to determine its switching.

Referring to Fig. 2 and Fig. 4, when the detection circuit 24 does not detect an input voltage of 12 volts from the power socket 26 with 4 pins on the motherboard 20, it means that the power supply 22 has only 20 The ATX power supply of the support pin (pin), so the controlled switch 25 is turned on by the control of the control signal of the control signal, and a second voltage is provided by the second output terminal of the ATX power supply 22 instead. value to the DC converter for the 1.75 volts required by the Pentium IV CPU 21. Wherein the second output terminal of the ATX power supply 22 is its 20 pins. And the second voltage value can be 5 volts.

Referring to Fig. 3 and Fig. 4, when the detection circuit 24 detects an input voltage of 12 volts from the power socket 26 with 4 pins on the motherboard 20, it means that the power supply 22 is a Pentium IV center ATX 12-volt power supply dedicated to the processor, and the controlled switch 25 is closed by the control of the control signal, and the 12 volts output by the ATX 12-volt power supply are directly converted into 1.75 volts through the DC converter 23 For the operation and use of the Pentium IV central processing unit 21.

Referring to Fig. 5, it is a circuit diagram of the power detection circuit of the present invention, as can be seen from the figure that the detection circuit 24 can detect the power socket 26 of the 4 pins on the motherboard by an inverter 241 Whether to input 12 volts, and send the generated control signal to the controlled switch 25 . The inverter 241 can be a metal oxide semiconductor field effect transistor (MOSFET). Wherein the controlled switch 25 can be a metal oxide semiconductor field effect transistor (MOSFET).

The present invention can drive the central processing unit and the main board to rotate even without using the dedicated power supply for the motherboard that needs to be powered exclusively by the power supply to a central processing unit, and can reduce waste of resources and The effect of reducing the cost required for users to update their computer equipment.

Claims (8)

1. A power detection circuit, which is suitable for the power supply of the main board. There is a circuit on the main board that needs to be powered by a power supply to a central processing unit, and the said power is transferred by a DC converter. The voltage value output by the supply device is converted into a predetermined voltage value to provide the power required by the central processing unit. The power detection circuit includes: a detection circuit, which is electrically connected to the The circuit of the central processing unit is used to detect whether the power supply is outputting a first voltage value to the motherboard and generate a control signal, the first voltage value is the voltage of the power supply required by the central processing unit value; and a controlled switch, electrically connected to the detection circuit and the second output terminal of the power supply, controlled by the control signal to switch the switch, and the first voltage value is not detected in the detection circuit When, the second output terminal of the power supply provides a second voltage value to the DC converter. 2. The power detection circuit according to claim 1, wherein the detection circuit uses an inverter to detect whether the power supply is inputting the first voltage value, and generates a control signal. 3. The power detection circuit according to claim 2, wherein the inverter is a MOSFET. 4. The power detection circuit according to claim 1, wherein the first voltage value is output from the first output terminal of the power supply. 5. The power detection circuit according to claim 1, wherein the controlled switch is a MOSFET. 6. A power supply detection method, which is suitable for the power supply of the mainboard. There is a circuit on the mainboard that needs to be powered by a power supply to a central processing unit, and the said power supply is transferred by a DC converter. The voltage value output by the supplier is converted into a predetermined voltage value to provide the required power for the central processing unit, and the steps include: A detection circuit detects whether the power supply is outputting a first voltage value to the motherboard, and generates a control signal, the first voltage value being the voltage value of the power supply required by the central processing unit; And controlled by the control signal to switch a controlled switch, and when the first voltage value is not detected, output a second voltage value from the second output terminal of the power supply to the DC conversion device. 7. The power detection method according to claim 6, wherein the detection circuit uses an inverter to detect whether the power supply inputs the first voltage value, and generates a control signal. 8. The power detection method according to claim 6, wherein the first voltage value is output from the first output terminal of the power supply.

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