阅读说明：本技术 电源控制电路及应用所述电源控制电路的主板 (Power supply control circuit and mainboard applying same ) 是由 李帆 王太诚 孙君 于 2018-08-15 设计创作，主要内容包括：一种电源控制电路,用于为电子元件供电,所述电源控制电路包括处理芯片、延时单元及电源转换单元,所述处理芯片用于在主板上电时输出使能信号,所述延时单元用于接收所述使能信号并将所述使能信号延时预设时间后输出,所述电源转换单元用于接收经由所述延时单元延时后输出的使能信号,并根据所接收的使能信号输出供电电压为所述电子元件供电。本发明还提供一种应用所述电源控制电路的主板,可保证输出至电子元件的供电电压之间的时序关系,以满足电子元件的供电要求。(A power supply control circuit is used for supplying power to electronic elements and comprises a processing chip, a delay unit and a power supply conversion unit, wherein the processing chip is used for outputting an enabling signal when a mainboard is powered on, the delay unit is used for receiving the enabling signal and delaying the enabling signal for a preset time and then outputting the enabling signal, and the power supply conversion unit is used for receiving the enabling signal output after the delay of the delay unit and outputting power supply voltage to supply power to the electronic elements according to the received enabling signal. The invention also provides a mainboard applying the power supply control circuit, which can ensure the time sequence relation between the power supply voltages output to the electronic elements so as to meet the power supply requirements of the electronic elements.)

1. A power control circuit for powering electronic components on a motherboard, the power control circuit comprising:

the processing chip is used for outputting an enabling signal when the mainboard is powered on;

the delay unit is used for receiving the enabling signal and outputting the enabling signal after delaying the enabling signal for a preset time; and

and the power supply conversion unit is used for receiving the delayed enable signal and outputting power supply voltage to supply power to the electronic element according to the delayed enable signal.

2. The power control circuit of claim 1, further comprising a filtering unit for filtering the supply voltage output by the power conversion unit.

3. The power control circuit according to claim 2, wherein the power conversion unit comprises a power conversion chip, a first capacitor, a second capacitor, a third capacitor, a first resistor, and an inductor, a ground pin of the power conversion chip is grounded, an enable pin of the power conversion chip is connected to the delay unit, an input pin of the power conversion chip is connected to the power source and grounded through the first capacitor, an input pin of the power conversion chip is further grounded through the second capacitor, an output pin of the power conversion chip is connected to a first end of the inductor, a second end of the inductor is connected to a power source end of the electronic component, a second end of the inductor is further connected to a reference pin of the power conversion chip through the third capacitor, and a first end of the first resistor is connected to a second end of the inductor, the second end of the first resistor is connected to a reference pin of the power conversion chip.

4. The power control circuit according to claim 3, wherein the filter unit comprises a fourth capacitor, a fifth capacitor and a sixth capacitor, a first end of the fourth capacitor is connected to the second end of the inductor, a second end of the fourth capacitor is grounded, a first end of the fifth capacitor is connected to the second end of the inductor, a second end of the fifth capacitor is grounded, a first end of the sixth capacitor is connected to the second end of the inductor, and a second end of the sixth capacitor is grounded.

5. The power control circuit of claim 4, wherein the delay circuit comprises a second resistor and a seventh capacitor, a first end of the second resistor is connected to the signal output pin of the processing chip, a second end of the second resistor is connected to the enable pin of the power conversion chip, and a second end of the second resistor is further grounded through the seventh capacitor.

6. A mainboard, includes power control circuit and electronic component, power control circuit is used for supplying power for electronic component, its characterized in that, power control circuit includes:

the processing chip is used for outputting an enabling signal when the mainboard is powered on;

the delay unit is used for receiving the enabling signal and outputting the enabling signal after delaying the enabling signal for a preset time; and

and the power supply conversion unit is used for receiving the enable signal output after the delay of the delay unit and outputting power supply voltage to supply power to the electronic element according to the received enable signal.

7. A main board according to claim 6, wherein the power control circuit further comprises a filtering unit, and the filtering unit is configured to filter the power supply voltage output by the power conversion unit.

8. The motherboard of claim 7, wherein the power conversion unit comprises a power conversion chip, a first capacitor, a second capacitor, a third capacitor, a first resistor, and an inductor, a ground pin of the power conversion chip is grounded, an enable pin of the power conversion chip is connected to the delay unit, an input pin of the power conversion chip is connected to the power source and grounded through the first capacitor, an input pin of the power conversion chip is further grounded through the second capacitor, an output pin of the power conversion chip is connected to a first end of the inductor, a second end of the inductor is connected to a power supply end of the electronic component, a second end of the inductor is further connected to a reference pin of the power conversion chip through the third capacitor, a first end of the first resistor is connected to a second end of the inductor, the second end of the first resistor is connected to a reference pin of the power conversion chip.

9. A main board according to claim 8, wherein the filter unit includes a fourth capacitor, a fifth capacitor, and a sixth capacitor, a first terminal of the fourth capacitor is connected to the second terminal of the inductor, a second terminal of the fourth capacitor is grounded, a first terminal of the fifth capacitor is connected to the second terminal of the inductor, a second terminal of the fifth capacitor is grounded, a first terminal of the sixth capacitor is connected to the second terminal of the inductor, and a second terminal of the sixth capacitor is grounded.

10. The motherboard of claim 9, wherein the delay circuit comprises a second resistor and a seventh capacitor, a first end of the second resistor is connected to the signal output pin of the processing chip, a second end of the second resistor is connected to the enable pin of the power conversion chip, and a second end of the second resistor is further grounded through the seventh capacitor.

Technical Field

The invention relates to a power supply control circuit and a mainboard applying the same.

Background

Generally, various types of Low Dropout regulators (LDOs) are used in a motherboard to perform DC-DC conversion into output voltages of +1V8_ SYS and +3V3_ SYS for supplying 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.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a power control circuit and a motherboard using the same.

A power control circuit for powering electronic components on a motherboard, the power control circuit comprising:

the processing chip is used for outputting an enabling signal when the mainboard is powered on;

the delay unit is used for receiving the enabling signal and outputting the enabling signal after delaying the enabling signal for a preset time; and

and the power supply conversion unit is used for receiving the delayed enable signal and outputting power supply voltage to supply power to the electronic element according to the delayed enable signal.

Furthermore, the power control circuit further comprises a filtering unit, and the filtering unit is used for filtering the power supply voltage output by the power conversion unit.

Furthermore, the power conversion unit comprises a power conversion chip, a first capacitor, a second capacitor, a third capacitor, a first resistor and an inductor, the grounding pin of the power conversion chip is grounded, the enabling pin of the power conversion chip is connected with the time delay unit, the input pin of the power conversion chip is connected to the power supply and grounded through the first capacitor, the input pin of the power conversion chip is grounded through the second capacitor, the output pin of the power conversion chip is connected to the first end of the inductor, the second end of the inductor is connected to a power supply end of the electronic component, the second end of the inductor is further connected to a reference pin of the power conversion chip through the third capacitor, the first end of the first resistor is connected to the second end of the inductor, and the second end of the first resistor is connected to a reference pin of the power conversion chip.

Furthermore, the filtering unit includes a fourth capacitor, a fifth capacitor, and a sixth capacitor, where a first end of the fourth capacitor is connected to the second end of the inductor, a second end of the fourth capacitor is grounded, a first end of the fifth capacitor is connected to the second end of the inductor, a second end of the fifth capacitor is grounded, a first end of the sixth capacitor is connected to the second end of the inductor, and a second end of the sixth capacitor is grounded.

Further, the delay circuit includes a second resistor and a seventh capacitor, a first end of the second resistor is connected to the signal output pin of the processing chip, a second end of the second resistor is connected to the enable pin of the power conversion chip, and a second end of the second resistor is also grounded through the seventh capacitor.

A mainboard, includes power control circuit and electronic component, power control circuit is used for electronic component power supply, power control circuit includes:

the processing chip is used for outputting an enabling signal when the mainboard is powered on;

the delay unit is used for receiving the enabling signal and outputting the enabling signal after delaying the enabling signal for a preset time; and

and the power supply conversion unit is used for receiving the enable signal output after the delay of the delay unit and outputting power supply voltage to supply power to the electronic element according to the received enable signal.

Furthermore, the power control circuit further comprises a filtering unit, and the filtering unit is used for filtering the power supply voltage output by the power conversion unit.

Furthermore, the power conversion unit comprises a power conversion chip, a first capacitor, a second capacitor, a third capacitor, a first resistor and an inductor, the grounding pin of the power conversion chip is grounded, the enabling pin of the power conversion chip is connected with the time delay unit, the input pin of the power conversion chip is connected to the power supply and grounded through the first capacitor, the input pin of the power conversion chip is grounded through the second capacitor, the output pin of the power conversion chip is connected to the first end of the inductor, the second end of the inductor is connected to a power supply end of the electronic component, the second end of the inductor is further connected to a reference pin of the power conversion chip through the third capacitor, the first end of the first resistor is connected to the second end of the inductor, and the second end of the first resistor is connected to a reference pin of the power conversion chip.

Furthermore, the filtering unit includes a fourth capacitor, a fifth capacitor, and a sixth capacitor, where a first end of the fourth capacitor is connected to the second end of the inductor, a second end of the fourth capacitor is grounded, a first end of the fifth capacitor is connected to the second end of the inductor, a second end of the fifth capacitor is grounded, a first end of the sixth capacitor is connected to the second end of the inductor, and a second end of the sixth capacitor is grounded.

Further, the delay circuit includes a second resistor and a seventh capacitor, a first end of the second resistor is connected to the signal output pin of the processing chip, a second end of the second resistor is connected to the enable pin of the power conversion chip, and a second end of the second resistor is also grounded through the seventh capacitor.

The power supply control circuit and the mainboard applying the power supply control circuit delay the enabling signal for the preset time through the delay unit, so that the power supply conversion unit can delay the power supply voltage for the preset time and then output the power supply voltage to the electronic element. Therefore, the time sequence relation between the power supply voltages output to the electronic element can be ensured so as to meet the power supply requirement of the electronic element.

Drawings

FIG. 1 is a block diagram of a preferred embodiment of a motherboard.

Fig. 2 is a circuit block diagram of a preferred embodiment of the power control circuit of fig. 1.

Fig. 3 is a circuit diagram of a preferred embodiment of the power control circuit of fig. 1.

Description of the main elements

Main board 100

Power supply control circuit 10

Processing chip 12

Delay unit 14

Power conversion unit 16

Filter unit 18

Electronic component 20

Power conversion chip U1

Resistors R1 and R2

Capacitor C1-C7

Power supply V1

Inductor L1

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the power control circuit and the motherboard using the power control circuit of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1 and fig. 2, in a preferred embodiment of the present invention, a main board 100 includes a power control circuit 10 and an electronic component 20. The electronic component 20 may be a Central Processing Unit (CPU)₎。

The power control circuit 10 includes a processing chip 12, a delay unit 14, and a power conversion unit 16.

The processing chip 12 is configured to output an enable signal when the motherboard 100 is powered on. The delay unit 14 is connected to the processing chip 12, and the delay unit 14 is configured to receive the enable signal, delay the enable signal for a preset time (e.g., 100ms), and output the delayed enable signal to the power conversion unit 16. The power conversion unit 16 will start to operate after receiving the enable signal.

The power conversion unit 16 is connected to the delay unit 14, and the power conversion unit 16 receives the system voltage output by the power V1. The power conversion unit 16 is further configured to receive an enable signal output after being delayed by the delay unit 14, and convert the system voltage into a first power supply voltage according to the received enable signal to supply power to the electronic component 20. In a preferred embodiment, the first power supply voltage is a dc voltage of 3.3V.

For example, the electronic component 20 needs to be powered by two voltages (e.g., a first power supply voltage of 3.3V and a second power supply voltage of 1.8V), and the second power supply voltage is required to be powered before the first power supply voltage in terms of timing. Thus, after the motherboard is powered on, the delay unit 14 delays the enable signal for a preset time, so that the power conversion unit 16 can delay the first power supply voltage for the preset time and then output the first power supply voltage to the electronic component 20. In this way, the first power supply voltage can supply power to the electronic device 20 after the second voltage. Therefore, the time sequence relation between the power supply voltages output to the electronic element can be ensured so as to meet the power supply requirement of the electronic element.

Further, the power control circuit 10 may further include a filtering unit 18, where the filtering unit 18 is configured to filter the power supply voltage output by the power conversion unit 16.

Since the filtering unit 18 has the functions of filtering, resisting interference and eliminating noise signals, a stable first power supply voltage can be output to the electronic component 20 after passing through the filtering unit 18.

Referring to fig. 3, in a preferred embodiment, the power conversion unit 16 further includes a power conversion chip U1, capacitors C1-C3, a resistor R1, and an inductor L1.

The power conversion chip U1 includes a ground pin GND, an enable pin EN, an input pin IN, an output pin OUT, and a reference pin FB. The ground pin GND of the power conversion chip U1 is grounded, and the enable pin EN of the power conversion chip U1 is connected to the delay unit 14. The input pin IN of the power conversion chip U1 is connected to the power supply V1 to receive the system voltage and is grounded through the capacitor C1, and the input pin IN of the power conversion chip U1 is also grounded through the capacitor C2. An output pin OUT of the power conversion chip U1 is connected to a first terminal of the inductor L1, a second terminal of the inductor L1 is connected to a power supply terminal (not shown) of the electronic component 20, and a second terminal of the inductor L1 is further connected to a reference pin FB of the power conversion chip U1 through the capacitor C3. A first end of the resistor R1 is connected to a second end of the inductor L1, and a second end of the resistor R1 is connected to a reference pin FB of the power conversion chip U1.

In a preferred embodiment, the filter unit 18 may further include three capacitors C4-C6. The first end of the capacitor C4 is connected to the second end of the inductor L1, the second end of the capacitor C4 is grounded, the first end of the capacitor C5 is connected to the second end of the inductor L1, the second end of the capacitor C5 is grounded, the first end of the capacitor C6 is connected to the second end of the inductor L1, and the second end of the capacitor C6 is grounded.

In a preferred embodiment, the delay unit 14 may further include a resistor R2 and a capacitor C7. The first end of the resistor R2 is connected to the signal output pin EXT _ EN of the processing chip 12, the second end of the resistor R2 is connected to the enable pin EN of the power conversion chip U1, and the second end of the resistor R2 is also connected to the ground through the capacitor C2.

When the motherboard is powered on, the processing chip 12 starts to output an enable signal, and at this time, the processing chip 12 outputs a certain power supply to charge the capacitor C7 through the resistor R2, that is, to perform a delay operation. The enabling signal is output to the power conversion chip U1 after the enabling signal is delayed for a preset time, and the power conversion chip U1 starts to work after receiving the enabling signal. The output pin OUT of the power conversion chip U1 outputs the first power supply voltage (e.g., 3.3V), and the first power supply voltage is filtered by the filtering unit 18 and then transmitted to the electronic component 20.

Wherein the first supply voltage is delayed in time sequence by a predetermined time than the second supply voltage by changing the resistance of the resistor R2 and the capacitance of the capacitor C7.

In the power control circuit 10 and the motherboard 100 applying the power control circuit 10, the delay unit 14 delays the enable signal for a preset time, so that the power conversion unit 16 delays the first power supply voltage for the preset time and outputs the first power supply voltage to the electronic component 20, and thus the first power supply voltage can supply power to the electronic component 20 after the second power supply voltage. In this way, the timing relationship between the power supply voltages outputted to the electronic device 20 can be ensured to satisfy the power supply requirements of the electronic device.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited, although the present invention is described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements can be made without departing from the spirit and scope of the present invention. Moreover, based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative effort will fall within the protection scope of the present invention.