CN215733444U

CN215733444U - Power supply voltage detection circuit and computer equipment

Info

Publication number: CN215733444U
Application number: CN202121074927.1U
Authority: CN
Inventors: 黄建新; 孔碧红
Original assignee: Shenzhen Weibu Information Co Ltd
Current assignee: Shenzhen Weibu Information Co Ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2022-02-01
Anticipated expiration: 2031-05-19

Abstract

The utility model discloses a power supply voltage detection circuit and computer equipment, wherein the power supply voltage detection circuit comprises a power supply end of a power supply socket connected with a first end of a first resistor, a second end of the first resistor connected with a first end of a second resistor, a second end of the second resistor connected with the ground, a second end of the first resistor connected with a first pin of a switch module, a third pin of the switch module connected with a preset voltage value, and a second pin of the switch module connected with a detection voltage output end. The embodiment of the utility model utilizes the N-mosfet to carry out isolation, has simple scheme and low cost, can effectively protect the controller, avoids damaging the controller chip caused by surge and ESD, and ensures the normal operation of the electronic computer.

Description

Power supply voltage detection circuit and computer equipment

Technical Field

The utility model relates to the technical field of computers, in particular to a power supply voltage detection circuit and computer equipment.

Background

The computer is one of the most advanced scientific and technical utility models in the 20 th century, has extremely important influence on the production activities and social activities of human beings, and develops rapidly with strong vitality. The application field of the computer system is expanded from the initial military scientific research application to various fields of society, a large-scale computer industry is formed, the technology progress in the global range is driven, the deep social revolution is caused, and the computer is spread throughout general schools, enterprises and public institutions, enters common people and becomes an essential tool in the information society. The computer mainboard is the core pivot that the computer constitutes, is computer core system operation module, also is the essential module of computer constitution, whether computer system can stable work, and the stability of work is directly influenced to the good or bad of its performance. Therefore, the design of the mainboard is an important link in computer design, and how to design a stable mainboard is an important subject for the research of all household computer mainboard designers, wherein the design of a computer mainboard power supply becomes a great importance during design, and under the global advocation of environmental protection and energy saving, how to stabilize and save electricity and energy of a notebook computer power supply is the direction of the research of designers;

at present, when a notebook computer is plugged into a power adapter, resistance value voltage division is usually adopted to detect whether a voltage value input by the power adapter is within a normal range. Sometimes, under the condition that the voltage value is unstable, when the power adapter is plugged in, the problem of voltage value overshoot occurs, and thus, the chip of the notebook computer is damaged by a sudden high voltage value, so that the notebook computer cannot work normally.

SUMMERY OF THE UTILITY MODEL

In view of the above technical problems, the present invention provides a power supply voltage detection circuit and a computer device.

The utility model provides a power supply voltage detection circuit, which comprises a power supply end of a power supply socket connected with a first end of a first resistor, a second end of the first resistor connected with a first end of a second resistor, a second end of the second resistor connected with the ground, a second end of the first resistor connected with a first pin of a switch module, a third pin of the switch module connected with a preset voltage value, and a second pin of the switch module connected with a detection voltage output end.

Optionally, the voltage value of the power end of the power socket is 12V.

Optionally, the switch module is an N-mosfet tube.

Optionally, a first pin of the N-mosfet transistor is a gate, a second pin is a source, and a third pin is a drain.

Optionally, the source of the N-mosfet is connected to a first end of a third resistor, and a second end of the third resistor is connected to ground.

Optionally, the source of the N-mosfet is further connected to a first end of a capacitor, and a second end of the capacitor is connected to ground.

Optionally, the N-mosfet tube is an SOT723 package. Optionally, the output voltage value of the detection voltage output terminal is 3.3V.

Optionally, the first resistor and the second resistor are in a chip package.

The second aspect of the present invention also provides a computer apparatus comprising the power supply voltage detection circuit of the first aspect.

The embodiment of the utility model provides a power supply voltage detection circuit and computer equipment, which comprise a power supply end of a power supply socket connected with a first end of a first resistor, a second end of the first resistor connected with a first end of a second resistor, a second end of the second resistor connected with the ground, a second end of the first resistor connected with a first pin of a switch module, a third pin of the switch module connected with a preset voltage value, and a second pin of the switch module connected with a detection voltage output end. The embodiment of the utility model utilizes the N-mosfet to carry out isolation, has simple scheme and low cost, can effectively protect the controller, avoids damaging the controller chip caused by surge and ESD, and ensures the normal operation of the electronic computer.

Drawings

Fig. 1 is a schematic diagram of the connection of a power supply voltage detection circuit according to an embodiment of the present invention.

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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the embodiment of the present invention includes: a power supply voltage detection circuit comprises a power supply end of a power socket and a first end of a first resistor, wherein a second end of the first resistor is connected with a first end of a second resistor, a second end of the second resistor is connected with the ground, a second end of the first resistor is connected with a first pin of a switch module, a third pin of the switch module is connected with a preset voltage value, and a second pin of the switch module is connected with a detection voltage output end.

Specifically, as shown in fig. 1, a power supply terminal VADP of the power socket is connected to a first terminal of a first resistor RP9, a second terminal of a first resistor RP9 is connected to a first terminal of a second resistor RP13, a second terminal of a second resistor RP13 is connected to ground, a second terminal of the first resistor RP9 is connected to a first pin of a switch module QP8, a third pin of the switch module QP8 is connected to a preset voltage value V3P3A-EC, and a second pin of the switch module QP8 is connected to a detection voltage output terminal ADP _ PRESENT.

The second pin of the switch module QP8 is also connected to the first pin of RP12, and the second terminal of the second pin of RP12 is connected to ground. Specifically, RP12 is a resistance of 100k ohms, packaged as SMR 0201.

Optionally, a first pin of the switch module QP8 is connected to the anode of a capacitor CP13, the cathode of CP13 is connected to ground, the CP13 is 0.1uF, 50V, and the CP13 is in a C0402 package.

Optionally, the 2 nd pin of the switch module QP8 is further connected to one end of a capacitor CP12, the other end of CP12 is grounded, CP12 is 1000pf/50V, and is packaged as SMC 0201.

Optionally, the voltage value of the power end of the power socket is 12V.

Optionally, the switch module is an N-mosfet tube.

Specifically, all N-mosfet transistors have three terminals, namely a gate (gate), a drain (drain), and a source (source), and the gate can be regarded as a switch for controlling one physical gate. This gate may allow or block the flow of electrons by fabricating or eliminating a channel between the source and drain. If affected by an applied voltage, electron flow will be from the source to the drain. The body is simply the bulk of the semiconductor in which the gate, drain and source are located. Typically the body terminal is connected to the highest or lowest voltage in a circuit, depending on the type. The body and source terminals are sometimes connected together because sometimes the source is also connected to the highest or lowest voltage in the circuit. Of course, there are times when FETs do not have such structures in some circuits, such as cascode transmission circuits and cascode circuits.

A Field Effect Transistor (FET), which is a Semiconductor device with majority carriers participating in conduction, also called a unipolar Transistor, is mainly divided into a Junction FET (JFET) and a Metal-Oxide Semiconductor FET (MOSFET), belongs to a voltage control type Semiconductor device, and has the advantages of high input resistance, low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown phenomenon, wide safe working range, and the like.

The MOS field effect Transistor is also called a Metal Oxide Semiconductor Field Effect Transistor (MOSFET). It is generally both depletion and enhancement. The enhancement type MOS FET can be classified as NPN type PNP type. The NPN type is generally called an N-channel type, and the PNP type is also called a P-channel type. The source and drain of the N-channel field effect transistor are connected to the N-type semiconductor, and the source and drain of the P-channel field effect transistor are connected to the P-type semiconductor. The output current of the fet is controlled by the input voltage (or field), which can be considered as little or no input current, which results in a high input impedance of the device.

Taking an N channel as an example, two source diffusion regions N + and drain diffusion regions N + with high doping concentration are formed on a P-type silicon substrate, and then a source electrode S and a drain electrode D are respectively led out. The source and the substrate are internally communicated, and the source and the substrate are always kept at the same potential. When the drain is connected to the positive power supply electrode, the source is connected to the negative power supply electrode, and VGS is set to 0, the channel current (i.e., drain current) ID is set to 0. As VGS increases gradually, negatively charged minority carriers are induced between the two diffusion regions under the positive gate voltage, forming an N-channel from the drain to the source, and when VGS is greater than the turn-on voltage VTN of the transistor (typically about +2V), the N-channel transistor starts to conduct, forming a drain current ID.

In the embodiment of the utility model, the source of the N-mosfet is connected with the first end of a third resistor RP12, the second end of the third resistor RP12 is connected with the ground, and the N-mosfet is packaged by an SOT 723.

Specifically, the second pin, source, of QP8 is connected to RP12, which RP12 is packaged as SOT 723.

In the embodiment of the utility model, the source electrode of the N-mosfet tube is also connected with the first end of the capacitor, and the second end of the capacitor is connected with the ground.

Specifically, the second pin of QP8 is also connected to a first terminal of capacitor CP12, a second terminal of which is connected to ground.

In the embodiment of the utility model, the QP8 conversion function is utilized to protect ADP _ Present, so that the controller of the computer equipment can be protected while the function is realized.

The capacitor can be used for decoupling and filtering, meets the requirement of the change of the current of a driving circuit, avoids mutual coupling interference, and further reduces high-frequency interference impedance between a power supply and a reference ground in the circuit.

In the embodiment of the Present invention, the output voltage value of the detection voltage output terminal ADP _ Present is 3.3V.

After the adaptor is inserted into the DC socket, an output level, for example, 12V level, is divided by 2 resistors, that is, RP9 and RP13, to have a high level, QP8 is turned on, pin 2 and pin 3 of QP8 are turned on, ADP _ Present outputs a 3.3V level, the ADP _ Present is connected to a controller of the computer device, when ADP _ Present is 3.3V, the controller knows that the power adaptor is inserted, the power adaptor is inserted in an instant surge, there is a high voltage pulse at the instant of 12V level, QP8 is also turned on through the voltage dividing resistor, but ADP _ Present signal output is not affected, and the controller of the computer device is protected.

The embodiment of the utility model provides a power supply voltage detection circuit, which comprises a power supply end of a power supply socket, a first end of a first resistor, a second end of the first resistor, a second end of a second resistor, a second end of the first resistor, a third pin of a switch module, and a second pin of the switch module, wherein the power supply end of the power supply socket is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the ground, the second end of the first resistor is connected with a first pin of the switch module, the third pin of the switch module is connected with a preset voltage value, and the second pin of the switch module is connected with a detection voltage output end. The embodiment of the utility model utilizes the N-mosfet to carry out isolation, has simple scheme and low cost, can effectively protect the controller, avoids damaging the controller chip caused by surge and ESD, and ensures the normal operation of the electronic computer.

The utility model also provides computer equipment comprising the power supply voltage detection circuit.

The computer equipment can be equipment in product forms of a notebook, a tablet, an all-in-one machine and the like.

The embodiment of the utility model provides computer equipment, which comprises a power supply end of a power socket, wherein the power supply end of the power socket is connected with a first end of a first resistor, a second end of the first resistor is connected with a first end of a second resistor, a second end of the second resistor is connected with the ground, a second end of the first resistor is connected with a first pin of a switch module, a third pin of the switch module is connected with a preset voltage value, and a second pin of the switch module is connected with a detection voltage output end. The embodiment of the utility model utilizes N-mosfet to carry out isolation, has simple scheme and low cost, can effectively protect the controller, avoids damaging the controller chip caused by surge and ESD electrostatic discharge, and ensures the normal operation of the electronic computer.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The power supply voltage detection circuit is characterized in that a power supply end comprising a power socket is connected with a first end of a first resistor, a second end of the first resistor is connected with a first end of a second resistor, a second end of the second resistor is connected with the ground, a second end of the first resistor is connected with a first pin of a switch module, a third pin of the switch module is connected with a preset voltage value, and a second pin of the switch module is connected with a detection voltage output end.

2. The power supply voltage detection circuit according to claim 1, wherein a voltage value of a power supply terminal of the power outlet is 12V.

3. The supply voltage detection circuit of claim 2, wherein the switch module is an N-mosfet tube.

4. The power supply voltage detection circuit of claim 3, wherein the first pin of the N-mosfet is a gate, the second pin is a source, and the third pin is a drain.

5. The supply voltage detection circuit of claim 4, wherein the source of the N-mosfet is connected to a first terminal of a third resistor, and a second terminal of the third resistor is connected to ground.

6. The supply voltage detection circuit of claim 4, wherein the source of the N-mosfet is further connected to a first terminal of a capacitor, and a second terminal of the capacitor is connected to ground.

7. The supply voltage detection circuit of claim 5, wherein the N-mosfet is an SOT723 package.

8. The power supply voltage detection circuit of claim 5, wherein the output voltage value of the detection voltage output terminal is 3.3V.

9. The supply voltage detection circuit of claim 1, wherein the first resistor and the second resistor are in a chip package.

10. A computer device comprising the power supply voltage detection circuit of any one of claims 1 to 9.