Wide voltage range detection circuit for mainboard

Abstract

The utility model provides a wide voltage range detection circuit for a mainboard, which is arranged on the mainboard and comprises a voltage signal analyzing and processing circuit and an analog-to-digital signal conversion circuit, an input end of the voltage signal analyzing and processing circuit is connected with an output end of a power supply, and an output end of the analog-to-digital signal conversion circuit is connected with an output end of the power supply. The output end of the voltage signal analyzing and processing circuit is connected with the input end of the analog-to-digital signal conversion circuit, the output end of the analog-to-digital signal conversion circuit is connected with the input end of the mainboard, and the power supply is in power supply connection with the mainboard. The voltage signal analysis processing circuit can detect the voltage provided by the power supply to the mainboard in real time and convert the voltage into a digital signal through the analog-to-digital signal conversion circuit to be fed back to the mainboard. The power failure protection circuit has the beneficial effect that the problem of data loss caused by abnormal power failure of the mainboard can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit technical field, concretely relates to a wide voltage range detection circuit for mainboard. BACKGROUND

[0002] Mainboard, generally refers to computer chassis mainboard, also called mainboard (mainboard), system board (system board) or mother board (motherboard);It is divided into two kinds of commercial mainboard and industrial mainboard.It is installed in the case, and it is one of the most basic and important components of microcomputer.Mainboard is generally rectangular circuit board, and it is installed with the main circuit system of computer, and generally has BIOS chip, I / O control chip, keyboard and panel control switch interface, indicating lamp plug-in component, expansion slot, mainboard and DC power supply power supply connector of plug-in component element.Mainboard adopts open structure.Mainboard mostly has 6-15 expansion slots, and the control card (adapter) of PC peripheral equipment is plugged in.Through replacing these plug-in cards, the corresponding subsystem of microcomputer can be upgraded locally, and the manufacturer and user have greater flexibility in the configuration model.In short, mainboard plays a pivotal role in the whole microcomputer system.It can be said that the type and level of mainboard determine the type and level of the whole microcomputer system.The performance of mainboard affects the performance of the whole microcomputer system.

[0003] At present, the working voltage of general mainboard is 24V, and the working range is mostly between 18V-42V, and the voltage provided by the power supply for the mainboard generally does not exceed 42V;Because the mainboard has high requirements on the voltage, if abnormal conditions such as sudden power failure occur, for example, the supply voltage suddenly drops to below 18V, or even below 9V, the mainboard will abnormally power off, many important data cannot be saved, and irreparable loss will be caused, which brings very bad user experience. UTILITY MODEL CONTENTS

[0004] In order to solve the problems in the prior art, the utility model provides a wide voltage range detection circuit for mainboard, by setting mutually cooperating voltage signal analysis processing circuit and analog-digital signal conversion circuit, voltage signal analysis processing circuit can detect the voltage provided by the power supply for the mainboard in real time and convert into digital signal through analog-digital signal conversion circuit and feed back to the mainboard, can realize real-time monitoring of the voltage value provided by the power supply for the mainboard, when the voltage drops to below 18V, feedback to the mainboard system to save data, when the voltage drops to below 9V, the mainboard system resets and shuts down, when the voltage rises to above 22V, keep normal work, can avoid the data loss problem caused by abnormal power off of the mainboard, solve the problem that the mainboard is easy to lose data when the power supply voltage is unstable in the prior art.

[0005] The utility model provides a wide voltage range detection circuit for mainboard is set up on the mainboard, including voltage signal analysis processing circuit and analog-digital signal conversion circuit, voltage signal analysis processing circuit's input is connected with the output of power supply, voltage signal analysis processing circuit's output is connected with the input of analog-digital signal conversion circuit, the output of analog-digital signal conversion circuit is connected with the input of mainboard, power supply is connected with the mainboard power supply, voltage signal analysis processing circuit can detect the voltage that power supply provides for mainboard in real time and is converted into digital signal through analog-digital signal conversion circuit and is fed back to mainboard.

[0006] The utility model makes further improvement, voltage signal analysis processing circuit includes current -limiting circuit, voltage clamping circuit, voltage dividing circuit and voltage signal amplification circuit, current -limiting circuit's input is connected with the output of power supply, current -limiting circuit's output is connected with the input of voltage clamping circuit, voltage clamping circuit's output is connected with the input of voltage dividing circuit, voltage dividing circuit's output is connected with the input of voltage signal amplification circuit, voltage signal amplification circuit's output is connected with the input of analog-digital signal conversion circuit.

[0007] The utility model makes further improvement, be equipped with resistance R461, resistance R470, electric capacity C447 and electric capacity C453 in current -limiting circuit, wherein, one end of resistance R461 is connected with the output of power supply, the other end of resistance R461 is connected with the one end of resistance R470, the one end of electric capacity C447, the other end of resistance R470 is connected with the input of voltage clamping circuit, the other end of electric capacity C447 is connected with the one end of electric capacity C453, the other end of electric capacity C453 is grounded.

[0008] The utility model makes further improvement, be equipped with clamping device D23 in voltage clamping circuit, clamping device D23 is equipped with 7 pins, the 4th, 5th, 6th pin of clamping device D23 is connected with the other end of resistance R470, the input of voltage dividing circuit, the 1st, 2nd, 3rd, 7th pin of clamping device D23 is grounded.

[0009] The utility model makes further improvement, be equipped with resistance R480, resistance R482 and resistance R483 in voltage dividing circuit, wherein, the one end of resistance R480 is connected with the 4th, 5th, 6th pin of clamping device D23, the other end of resistance R480 is connected with the one end of resistance R482, the other end of resistance R482 is connected with the one end of resistance R483, the input of voltage signal amplification circuit, the other end of resistance R483 is grounded.

[0010] The utility model disc further improve, the voltage signal amplification circuit is equipped with resistance R484, diode D25, signal amplification chip U58 and resistance R492, wherein, signal amplification chip U58 is equipped with 5 pins, one end of resistance R484 is connected with the other end of resistance R482, one end of resistance R483, the other end of resistance R484 is connected with the 1st pin of signal amplification chip U58, the anode of diode D25, the 4th pin of signal amplification chip U58 is connected with one end of resistance R492, the other end of resistance R492 is connected with the input end of analog-digital signal conversion circuit.

[0011] The utility model disc further improve, and the analog-digital signal conversion circuit is equipped with analog-digital signal conversion chip U47, resistance R279 and electric capacity C137, wherein, analog-digital signal conversion chip U47 is equipped with 48 pins, and the 1st, 48 pins of analog-digital signal conversion chip U47 are connected with 3.3V voltage source, and the 7th pin of analog-digital signal conversion chip U47 is connected with the other end of resistance R492, one end of resistance R279, one end of electric capacity C137, the other end of resistance R279 is connected with 3.3V voltage source, and the other end of electric capacity C137 is grounded, and the 13th, 14th pin of analog-digital signal conversion chip U47 is connected with the input end of mainboard.

[0012] The utility model disc further improve, and the model of clamping device D23 is TVS2700DRVR, the model of signal amplification chip U58 is LMV321ADCK, and the model of analog-digital signal conversion chip U47 is GD32E235.

[0013] Compared with the prior art, the utility model discloses the beneficial effects are: provide a kind of wide voltage range detection circuit for mainboard, by being equipped with mutually coordinated voltage signal analysis processing circuit and analog-digital signal conversion circuit, voltage signal analysis processing circuit can detect the voltage that power supply provides to mainboard in real time and is converted into digital signal by analog-digital signal conversion circuit and is fed back to mainboard, can realize real-time monitoring voltage value that power supply provides to mainboard, when voltage drops to 18V below, feedback to mainboard system does save data action, when voltage drops to 9V below, mainboard system resets and shuts down, when voltage rises to 22V above, keep normal work, can avoid the data loss problem caused by mainboard abnormal power-down, solve the problem that mainboard in prior art is prone to data loss when power supply voltage is unstable. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the scheme in the present application or the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Fig. 1 A principle block diagram of a wide voltage range detection circuit for a mainboard according to the present application;

[0016] Fig. 2 A circuit diagram of a voltage signal analysis processing circuit according to the present application;

[0017] Fig. 3 A circuit diagram of an analog-digital signal conversion circuit according to the present application. DETAILED DESCRIPTION

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the description and claims of this application as well as the above drawings, are not intended to limit the present application to the specific embodiments contained therein but covers both serial modifications and equivalents thereof. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0019] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely examples from a multitude of embodiments that are in substantial compliance with the principles of the application. It is expressly intended that the embodiments described herein are in substantial compliance with the principles of the application.

[0020] In order to make the person skilled in the art better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings.

[0021] As Figs. 1-3The utility model provides a wide voltage range detection circuit for mainboard, set up on the mainboard, including voltage signal analysis processing circuit and AD conversion circuit, voltage signal analysis processing circuit's input end is linked with the output end of power supply, voltage signal analysis processing circuit's output end is linked with AD conversion circuit's input end, AD conversion circuit's output end is linked with the input end of mainboard, power supply is connected with the power supply of mainboard, voltage signal analysis processing circuit includes current -limiting circuit, voltage clamping circuit, voltage dividing circuit and voltage signal amplification circuit, current -limiting circuit's input end is linked with the output end of power supply, current -limiting circuit's output end is linked with voltage clamping circuit's input end, voltage clamping circuit's output end is linked with voltage dividing circuit's input end, voltage dividing circuit's output end is linked with voltage signal amplification circuit's input end, voltage signal amplification circuit's output end is linked with AD conversion circuit's input end, in this embodiment, voltage signal analysis processing circuit can detect the voltage that power supply provides for mainboard in real time and is converted into digital signal feedback to mainboard through AD conversion circuit, can realize real -time monitoring voltage value that power supply provides for mainboard, when voltage drops to 18V below, feedback to mainboard system does save data action, when voltage drops to 9V below, mainboard system resets and shuts down, when voltage rises to 22V above, keep normal work, can avoid the data loss problem that mainboard abnormal power down brings.

[0022] As Fig. 2As shown, the current limiting circuit is provided with resistor R461, resistor R470, capacitor C447 and capacitor C453, one end of resistor R461 is connected with the output end of the power supply, the other end of resistor R461 is connected with one end of resistor R470 and one end of capacitor C447, the other end of resistor R470 is connected with the input end of the voltage clamping circuit, the other end of capacitor C447 is connected with one end of capacitor C453, the other end of capacitor C453 is grounded; the voltage clamping circuit is provided with clamping device D23, the model of clamping device D23 is TVS2700DRVR, clamping device D23 is provided with 7 pins, the 4th, 5th and 6th pins of clamping device D23 are connected with the other end of resistor R470 and the input end of the voltage dividing circuit, the 1st, 2nd, 3rd and 7th pins of clamping device D23 are grounded; the voltage dividing circuit is provided with resistor R480, resistor R482 and resistor R483, one end of resistor R480 is connected with the 4th, 5th and 6th pins of clamping device D23, the other end of resistor R480 is connected with one end of resistor R482, the other end of resistor R482 is connected with one end of resistor R483 and the input end of the voltage signal amplification circuit, the other end of resistor R483 is grounded; the voltage signal amplification circuit is provided with resistor R484, diode D25, signal amplification chip U58 and resistor R492, the model of signal amplification chip U58 is LMV321ADCK, signal amplification chip U58 is provided with 5 pins, one end of resistor R484 is connected with the other end of resistor R482 and one end of resistor R483, the other end of resistor R484 is connected with the 1st pin of signal amplification chip U58 and the anode of diode D25, the 4th pin of signal amplification chip U58 is connected with one end of resistor R492, the other end of resistor R492 is connected with the input end of the analog-digital signal conversion circuit. In the embodiment, the voltage signal of the power supply is first limited by the current limiting circuit, then the voltage clamping circuit is used to let the voltage output to the voltage dividing circuit be about 24V, the voltage dividing circuit is used to divide the voltage again, then the voltage signal amplification circuit is used to amplify the voltage, finally the analog-digital signal conversion circuit is used to output the voltage, so that the voltage data output by the power supply can be accurately obtained.

[0023] As Fig. 3As shown, the analog-digital signal conversion circuit is provided with an analog-digital signal conversion chip U47, a resistor R279 and a capacitor C137, wherein the analog-digital signal conversion chip U47 is provided with 48 pins, the model of the analog-digital signal conversion chip U47 is GD32E235, the 1st and 48th pins of the analog-digital signal conversion chip U47 are connected with a 3.3V voltage source, the 7th pin of the analog-digital signal conversion chip U47 is connected with the other end of the resistor R492, one end of the resistor R279 and one end of the capacitor C137, the other end of the resistor R279 is connected with a 3.3V voltage source, the other end of the capacitor C137 is grounded, and the 13th and 14th pins of the analog-digital signal conversion chip U47 are connected with the input end of the mainboard.

[0024] As can be seen from the above, the utility model provides a wide voltage range detection circuit for mainboard, through setting mutually coordinated voltage signal analysis processing circuit and analog-digital signal conversion circuit, voltage signal analysis processing circuit can detect the voltage that power supply provides for mainboard in real time and is converted as digital signal feedback to mainboard through analog-digital signal conversion circuit, can realize real-time monitoring voltage value that power supply provides for mainboard, when voltage drops to below 18V, feedback to mainboard system does save data action, when voltage drops to below 9V, mainboard system resets and shuts down, when voltage rises to above 22V, keep normal work, can avoid the data loss problem caused by the abnormal power-down of mainboard, solve the problem of data loss of mainboard in prior art when power supply voltage is unstable.

[0025] The above-described specific embodiments are preferred embodiments of the utility model, and the utility model is not limited by the specific embodiments, and the scope of the utility model includes but is not limited to the specific embodiments, and equivalent changes made according to the utility model are within the protection scope of the utility model.

Claims

1. A wide voltage range detection circuit for a motherboard, disposed on the motherboard, characterized in that: The voltage signal analysis processing circuit is connected with the output end of the power supply, and the output end of the voltage signal analysis processing circuit is connected with the input end of the analog-digital signal conversion circuit, and the output end of the analog-digital signal conversion circuit is connected with the input end of the mainboard.

2. The wide voltage range detection circuit for a main board according to claim 1, characterized by: The voltage signal analysis processing circuit comprises a current limiting circuit, a voltage clamping circuit, a voltage dividing circuit and a voltage signal amplification circuit, the input end of the current limiting circuit is connected with the output end of the power supply, the output end of the current limiting circuit is connected with the input end of the voltage clamping circuit, the output end of the voltage clamping circuit is connected with the input end of the voltage dividing circuit, the output end of the voltage dividing circuit is connected with the input end of the voltage signal amplification circuit, and the output end of the voltage signal amplification circuit is connected with the input end of the analog-digital signal conversion circuit.

3. The wide voltage range detection circuit for a main board according to claim 2, characterized by: The current limiting circuit is provided with a resistor R461, a resistor R470, a capacitor C447 and a capacitor C453, one end of the resistor R461 is connected with the output end of the power supply, the other end of the resistor R461 is connected with one end of the resistor R470 and one end of the capacitor C447, the other end of the resistor R470 is connected with the input end of the voltage clamping circuit, the other end of the capacitor C447 is connected with one end of the capacitor C453, and the other end of the capacitor C453 is grounded.

4. The wide voltage range detection circuit for a main board according to claim 3, characterized by: The voltage clamping circuit is provided with a clamping device D23, the model of the clamping device D23 is TVS2700DRVR, the clamping device D23 is provided with seven pins, the fourth, fifth and sixth pins of the clamping device D23 are connected with the other end of the resistor R470 and the input end of the voltage dividing circuit, and the first, second, third and seventh pins of the clamping device D23 are grounded.

5. The wide voltage range detection circuit for a main board according to claim 4, characterized by: The voltage dividing circuit is provided with a resistor R480, a resistor R482 and a resistor R483, one end of the resistor R480 is connected with the fourth, fifth and sixth pins of the clamping device D23, the other end of the resistor R480 is connected with one end of the resistor R482, the other end of the resistor R482 is connected with one end of the resistor R483 and the input end of the voltage signal amplification circuit, and the other end of the resistor R483 is grounded.

6. The wide voltage range detection circuit for a main board according to claim 5, characterized by: The voltage signal amplification circuit is internally provided with a resistor R484, a diode D25, a signal amplification chip U58 and a resistor R492, wherein the signal amplification chip U58 is of a model of LMV321ADCK, the signal amplification chip U58 is provided with five pins, one end of the resistor R484 is connected with the other end of the resistor R482 and one end of the resistor R483, the other end of the resistor R484 is connected with a first pin of the signal amplification chip U58 and a positive electrode of the diode D25, a fourth pin of the signal amplification chip U58 is connected with one end of the resistor R492, and the other end of the resistor R492 is connected with an input end of the analog-digital signal conversion circuit.

7. The wide voltage range detection circuit for a main board according to claim 6, characterized by: The analog-digital signal conversion circuit is internally provided with an analog-digital signal conversion chip U47, a resistor R279 and a capacitor C137, wherein the analog-digital signal conversion chip U47 is of a model of GD32E235, the analog-digital signal conversion chip U47 is provided with 48 pins, the first pin and the 48th pin of the analog-digital signal conversion chip U47 are connected with a 3.3V voltage source, a seventh pin of the analog-digital signal conversion chip U47 is connected with the other end of the resistor R492, one end of the resistor R279 and one end of the capacitor C137, the other end of the resistor R279 is connected with a 3.3V voltage source, the other end of the capacitor C137 is grounded, and the thirteenth pin and the fourteenth pin of the analog-digital signal conversion chip U47 are connected with an input end of the mainboard.

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