CN111813208A - Power supply control circuit and mainboard using the power supply control circuit - Google Patents

Abstract

The present application provides a power control circuit, the power control circuit includes a chipset, a delay module and a power conversion module, the chipset is used for outputting a power-on signal when the motherboard is powered on, and the delay module is used for receiving The power-on signal output by the chipset, the delay module is used for outputting an enable signal to the power conversion module after receiving the preset time of the power-on signal, and the power conversion module is used for according to the power conversion module. Can signal output supply voltage to supply power to electronic components. The present application also provides a mainboard. The power supply control circuit and the main board provided according to the present application can ensure the time sequence relationship between the power supply voltages output to the electronic components, so as to meet the power supply requirements of the electronic components.

Description

Power supply control circuit and mainboard using the power supply control circuit

technical field

The present application relates to a power control circuit and a mainboard using the power control circuit.

Background technique

Under the control of the power-on signal PS_ON, the computer's Advanced Technology Extended (ATX) power supply can provide the mainboard with the power supply normal signal PWROK and voltages such as +5V_SYS, +3V3_SYS and +12V_SYS. Usually, various types of Low Dropout Regulators (LDOs) are used in computer motherboards to convert DC-DC into output voltages such as +1V8_SYS and +3V3_SYS to supply power to electronic components. In this case, it is very important to ensure the timing relationship between the output voltages of the system power supply.

SUMMARY OF THE INVENTION

In view of the above, it is necessary to provide a power supply control circuit and a mainboard using the power supply control circuit, which can ensure the timing relationship between the output voltages of the system power supply.

An embodiment of the present application provides a power control circuit for supplying power to electronic components on a motherboard, the power control circuit includes a chipset, the chipset is used to output a power-on signal when the motherboard is powered on, the The power control circuit also includes:

a delay module, the delay module is electrically connected to the chip set to receive a power-on signal output by the chip set, and the delay module is configured to output an enable signal after receiving a preset time of the power-on signal; and

A power conversion module, the power conversion module is electrically connected to the delay module to receive the enable signal, and the power conversion module is used for outputting a power supply voltage to supply power to electronic components according to the enable signal.

As a preferred solution, the delay module includes a switch, a control chip, a first resistor and a second resistor. A first end of the switch is electrically connected to the chipset to receive the power-on signal, and a first end of the switch is electrically connected to the chip set to receive the power-on signal. The two terminals are grounded, the third terminal of the switch is electrically connected to the first power supply through the first resistor, and the control signal pin of the control chip is electrically connected to the first resistor and the third terminal of the switch. node, the detection signal pin of the control chip is electrically connected to the first power supply through the second resistor.

As a preferred solution, the delay module further includes a first capacitor and a Zener diode, the control signal pin of the control chip is grounded through the first capacitor, and the anode of the Zener diode is electrically connected to the first capacitor. A node between a resistor and the third terminal of the switch, the cathode of the Zener diode is electrically connected to the second power source.

As a preferred solution, the delay module further includes a third resistor, and the first end of the switch is further connected to a third power source through the third resistor.

As a preferred solution, the delay module further includes a second capacitor, the voltage signal pin of the control chip is electrically connected to a fourth power source, and the voltage signal pin of the control chip is also grounded through the second capacitor.

As a preferred solution, the delay module further includes a fourth resistor and a fifth resistor, the enable signal pin of the control chip is electrically connected to the first power supply through the fourth resistor, and the The enable signal pin is also grounded through the fifth resistor, the ground pin of the control chip is grounded, and the enable signal pin of the control chip is also electrically connected to a power conversion module to output an enable signal to the power supply conversion module.

As a preferred solution, the switch is an N-type field effect transistor.

As a preferred solution, the first end, the second end and the third end of the switch correspond to the gate electrode, the source electrode and the drain electrode of the N-type field effect transistor.

As a preferred solution, both the first power supply and the fourth power supply are used to output a voltage of 3.3 volts, and both the second power supply and the third power supply are used to output a voltage of 5 volts.

A mainboard includes electronic components and the above-mentioned power control circuit.

In the power supply control circuit and the motherboard applying the power supply control circuit provided by the embodiments of the present application, the delay module delays the enable signal by a preset time, so that the power conversion module can delay the power supply voltage. output to the electronic components after a preset time. In this way, the timing relationship between the power supply voltages output to the electronic components can be guaranteed to meet the power supply requirements of the electronic components.

Description of drawings

FIG. 1 is a block diagram of a preferred embodiment of a motherboard according to the present application.

FIG. 2 is a block diagram of the power control circuit of FIG. 1 .

FIG. 3 is a circuit diagram of a preferred embodiment of the power control circuit in FIG. 1 .

Description of main component symbols

Motherboard 100

Power Control Circuit 10

Chipset 12

Delay module 14

Power Conversion Module 16

Electronic Components 20

Resistors R1-R5

Capacitors C1-C2

Control chip U1

Zener diode ZD1

Switch Q1

The following specific embodiments will further illustrate the present application in conjunction with the above drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments.

Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

Please refer to FIG. 1 , which is a block diagram of a preferred embodiment of a motherboard 100 according to the present application. The motherboard 100 includes a power control circuit 10 and electronic components 20 . The power control circuit 10 is electrically connected to the electronic components 20 for supplying power to the electronic components 20 . In this embodiment, the motherboard 100 may be a computer motherboard. The electronic component 20 may be a central processing unit (CPU).

Please refer to FIG. 2 , which is a block diagram of a preferred embodiment of the power control circuit 10 according to the present application. The power control circuit 10 includes a chipset 12 , a delay module 14 and a power conversion module 16 .

Specifically, in the embodiment of the present application, the delay module 14 is electrically connected between the chipset 12 and the power conversion module 16 , and the power conversion module 16 is electrically connected to the electronic component 20 .

The chipset 12 is configured to output a power-on signal to the delay module 14 when the motherboard 100 is powered on. The delay module 14 is configured to receive the power-on signal output by the chipset 12 , and output an enable signal to the power conversion module 16 after receiving the power-on signal for a preset time. In one embodiment, the preset time may be 300 milliseconds. The size of the preset time can be correspondingly adjusted according to the actual needs of the system.

The power conversion module 16 is configured to receive the enable signal, and output a supply voltage to supply power to the electronic element 20 according to the enable signal, and the electronic element 20 can start to work after receiving the supply voltage.

Please refer to FIG. 3 , which is a circuit diagram of a preferred embodiment of the power control circuit 10 according to the present application.

The delay module 14 includes a switch Q1, a control chip U1, a Zener diode ZD1, two capacitors C1-C2 and five resistors R1-R5.

The control chip U1 includes a control signal pin SENSE, a detection signal pin CT, a voltage signal pin VDD, an enable signal pin RESET and a ground pin GND.

The first terminal of the switch Q1 is electrically connected to the chipset 12 to receive the power-on signal, the second terminal of the switch Q1 is grounded, and the third terminal of the switch Q1 is electrically connected to the first power source through the resistor R1 v1. The control signal pin SENSE of the control chip U1 is electrically connected to the node P1 between the resistor R1 and the third end of the switch Q1, and the detection signal pin CT of the control chip U1 is electrically connected through the resistor R2. Connect the first power supply V1.

The control signal pin SENSE of the control chip U1 is grounded through the capacitor C1, the anode of the zener diode ZD1 is electrically connected to the node between the resistor R1 and the third end of the switch Q1, and the voltage regulator The cathode of the diode ZD1 is electrically connected to the second power supply V2.

The first end of the switch Q1 is also connected to the third power supply V3 through the resistor R3. The voltage signal pin VDD of the control chip U1 is electrically connected to the fourth power supply V4, and the voltage signal pin VDD of the control chip U1 is also grounded through the capacitor C2. The enable signal pin RESET of the control chip U1 is electrically connected to the first power supply V1 through the resistor R4, and the enable signal pin RESET of the control chip U1 is also grounded through the resistor R5. The ground pin GND of U1 is grounded, and the enable signal pin RESET of the control chip U1 is also electrically connected to the power conversion module 16 to output an enable signal to the power conversion module 16 .

In a preferred embodiment, the switch Q1 is an N-type field effect transistor, and the first end, the second end and the third end of the switch Q1 correspond to the gate, source and drain.

In a preferred embodiment, both the first power supply V1 and the fourth power supply V4 are used to output a voltage of 3.3 volts. Both the second power supply V2 and the third power supply V3 are used to output a voltage of 5 volts.

The working principle of the power supply control circuit 10 and the main board 100 of the present application will be described in detail below by taking the circuit diagram shown in FIG. 3 as an example.

When the motherboard 100 is not in the working state, the chipset 12 will continue to output a high-level power-on signal to the first end of the switch Q1, and the switch Q1 is turned on, so that the node P1 is turned on. is pulled down to a low level. At this time, after the control signal pin SENSE of the control chip U1 receives the low-level signal at the node P1, the enable signal pin RESET of the control chip U1 will not output an enable signal to the Power conversion module 16 . Therefore, the power conversion module 16 does not output a supply voltage to supply power to the electronic components 20 .

When the main board 10 presses the power-on button, the chipset 12 will output a low-level power-on signal to the first end of the switch Q1, the switch Q1 is turned off, and the control signal of the control chip U1 leads to The pin SENSE receives the high level signal at the node P1. At this time, the enable signal pin RESET of the control chip U1 will start to output an enable signal to the power conversion module 16 after a preset time of receiving the power-on signal. The power conversion module 16 will output a supply voltage to supply power to the electronic components 20 after receiving the enable signal.

In this embodiment, the preset time for delaying the enable signal by the delay module 14 may be determined by the resistance value of the resistor R2.

Specifically, the detection signal pin CT of the control chip U1 receives the voltage output by the first power supply V1 through the resistor R2. Therefore, the detection signal pin CT of the control chip U1 can correspondingly adjust the delay time of the output enable signal according to the detected current value. For example, when the resistor R2 has a first resistance value, so that the detection signal pin CT of the control chip U1 can detect a small current value (eg 0.05A), at this time, the control The chip U1 will start to output an enable signal to the power conversion module 16 180ms after receiving the power-on signal according to the detected low current value. When the resistor R2 has a second resistance value, so that the detection signal pin CT of the control chip U1 can detect a larger current value (eg 0.1A), at this time, the control chip U1 According to the detected large current value, the enable signal will be output to the power conversion module 16 300ms after receiving the power-on signal.

It can be seen that the delay module 14 can adjust the resistance value of the resistor R2 according to the actual needs of the system, so as to correspondingly adjust the delay time required for the enable signal.

In the power control circuit 10 and the main board 100 provided with the power control circuit 10 provided by the above-mentioned embodiments, the delay module 14 delays the enable signal for a preset time, thereby enabling the power conversion module 16 to The power supply voltage is output to the electronic component 20 after a delay of a preset time. In this way, the timing relationship between the power supply voltages output to the electronic components 20 can be guaranteed to meet the power supply requirements of the electronic components.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present application, rather than being used to limit the present application, as long as the above embodiments are appropriate within the scope of the essential spirit of the present application Variations and variations are within the scope of the claims of this application.

Claims (10)

1. a power supply control circuit for supplying power to electronic components on the main board, the power supply control circuit comprising a chipset, and the chipset is used to output a power-on signal when the main board is powered on, it is characterized in that the power supply The control circuit also includes: a delay module, the delay module is electrically connected to the chip set to receive a power-on signal output by the chip set, and the delay module is configured to output an enable signal after receiving a preset time of the power-on signal; and A power conversion module, the power conversion module is electrically connected to the delay module to receive the enable signal, and the power conversion module is used for outputting a power supply voltage to supply power to electronic components according to the enable signal. 2 . The power supply control circuit according to claim 1 , wherein the delay module comprises a switch, a control chip, a first resistor and a second resistor, and the first end of the switch is electrically connected to the chip set to receiving the power-on signal, the second end of the switch is grounded, the third end of the switch is electrically connected to the first power supply through the first resistor, and the control signal pin of the control chip is electrically connected to the first resistor The node between the switch and the third end of the switch, the detection signal pin of the control chip is electrically connected to the first power supply through the second resistor. 3. The power supply control circuit according to claim 2, wherein the delay module further comprises a first capacitor and a Zener diode, and the control signal pin of the control chip is grounded through the first capacitor, so The anode of the Zener diode is electrically connected to the node between the first resistor and the third end of the switch, and the cathode of the Zener diode is electrically connected to the second power supply. 4 . The power control circuit of claim 3 , wherein the delay module further comprises a third resistor, and the first end of the switch is further connected to a third power source through the third resistor. 5 . 5 . The power supply control circuit according to claim 4 , wherein the delay module further comprises a second capacitor, the voltage signal pin of the control chip is electrically connected to a fourth power supply, and the voltage signal of the control chip is electrically connected to the fourth power supply. 6 . The pin is also grounded through the second capacitor. 6. The power supply control circuit of claim 5, wherein the delay module further comprises a fourth resistor and a fifth resistor, and an enable signal pin of the control chip is electrically connected through the fourth resistor The first power supply, the enable signal pin of the control chip is also grounded through the fifth resistor, the ground pin of the control chip is grounded, and the enable signal pin of the control chip is also electrically connected to the power converter module to output an enable signal to the power conversion module. 7. The power control circuit of claim 2, wherein the switch is an N-type field effect transistor. 8 . The power control circuit of claim 7 , wherein the first terminal, the second terminal and the third terminal of the switch correspond to the gate, source and drain of the N-type field effect transistor. 9 . 9 . The power control circuit of claim 6 , wherein the first power supply and the fourth power supply are both used for outputting a voltage of 3.3 volts, and the second power supply and the third power supply are both used for outputting a voltage of 3.3 volts. 10 . to output 5 volts. 10. A mainboard, characterized in that, the mainboard comprises electronic components and the power supply control circuit according to any one of claims 1-9.

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