CN105633905A - Overvoltage and under-voltage protection circuit - Google Patents
Overvoltage and under-voltage protection circuit Download PDFInfo
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- CN105633905A CN105633905A CN201410584346.0A CN201410584346A CN105633905A CN 105633905 A CN105633905 A CN 105633905A CN 201410584346 A CN201410584346 A CN 201410584346A CN 105633905 A CN105633905 A CN 105633905A
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Abstract
An overvoltage and under-voltage protection circuit inputs voltage references to an overvoltage detection module and an under-voltage detection module, monitors whether a first driving voltage is higher than a reference voltage or not through the overvoltage detection module, and monitors whether a second driving voltage is lower than the reference voltage or not through the under-voltage detection module. When the overvoltage detection module detects that the first driving voltage is higher than the reference voltage, the overvoltage detection module controls a switch control module to cut off so as to allow a main control chip to stop work. When the under-voltage detection module detects that the second driving voltage is lower than the reference voltage, the under-voltage detection module controls the switch control module to cut off so as to allow the main control chip to stop work. The protection of a main control chip is realized when the abnormal phenomenon such as overvoltage, under voltage and the like occurs, and the main control chip is prevented from being damaged.
Description
Technical field
The present invention relates to abnormity protection circuit, particularly relate to the over-and under-voltage protection circuit of a kind of main control chip.
Background technology
Main control chip is the core component of mainboard or hard disk, is contact the bridge between each equipment, is also the brain of control equipment operation work. In the motherboard, two large chips are most important, and one is South Bridge chip and another is north bridge chips. Two large chips are higher to the requirement of input voltage, namely could have to normally control various parameter in normal operating voltage range. In general, main control chip is higher to output voltage and the current requirements of circuit, namely all main control chip can be caused damage when the output voltage of power supply is too high or too low. Such as, when supply voltage is too high, can cause that main control chip burns. And when input voltage is too low, it is possible to the electric current in main control chip can be caused to increase so that damaging main control chip.
Summary of the invention
Based on this, it is necessary to provide the over-and under-voltage protection circuit of a kind of main control chip circuit abnormality.
A kind of over-and under-voltage protection circuit, including reference voltage module, overvoltage detection module, under-voltage detection module and switch control module;
Described reference voltage module is for being converted to reference voltage by supply voltage, and described reference voltage is input to described overvoltage detection module and described under-voltage detection module;
Described overvoltage detection module includes for connecing the first input end of input voltage, the second input of input reference voltage and the outfan being connected with the input of described switch control module;
Described under-voltage detection module includes the first input end for input reference voltage, for the second input connecing input voltage and the outfan being connected with the input of described switch control module;
The outfan of described switch control module is for being connected with main control chip;
Wherein, described overvoltage detection module is used for converting input voltage into the first driving voltage, when described first driving voltage is higher than described reference voltage, described overvoltage detection module controls the cut-off of described switch control module, and the main control chip being connected with described switch control module quits work;
Described under-voltage detection module is used for converting input voltage into the second driving voltage, when described second driving voltage is lower than described reference voltage, described under-voltage detection module controls the cut-off of described switch control module, and the main control chip being connected with described switch control module quits work.
Wherein in an embodiment, described reference voltage module includes resistance R1, three-terminal voltage-stabilizing pipe U1;
Described resistance R1 mono-terminates supply voltage, another terminate described three-terminal voltage-stabilizing pipe U1 negative electrode, the plus earth of described three-terminal voltage-stabilizing pipe U1, the control end of described three-terminal voltage-stabilizing pipe U1 be connected with negative electrode after output reference voltage.
Wherein in an embodiment, described overvoltage detection module includes operational amplifier U2A, divider resistance R2 and divider resistance R3;
Described divider resistance R2 and described divider resistance R3 is series between input voltage and earth terminal, and described divider resistance R2 connects input voltage away from one end of described divider resistance R3; The common port of described divider resistance R2 and described divider resistance R3 is connected with the normal phase input end of described operational amplifier U2A, and the inverting input of described operational amplifier U2A inputs described reference voltage;
Described divider resistance R2 connects the first input end that one end of input voltage is described overvoltage detection module, the inverting input of described operational amplifier U2A is the second input of described overvoltage detection module, and the outfan of described operational amplifier U2A is the outfan of described overvoltage detection module;
The points of common connection of described divider resistance R2 and described divider resistance R3 exports the first driving voltage.
Wherein in an embodiment, described overvoltage detection module also includes diode D1; The positive pole of described diode D1 connects the outfan of described operational amplifier U2A, and negative pole connects the input of described switch control module.
Wherein in an embodiment, described under-voltage detection module includes operational amplifier U2B, divider resistance R4 and divider resistance R5;
Described divider resistance R4 and described divider resistance R5 is series between input voltage and earth terminal, and described divider resistance R4 connects input voltage away from one end of described divider resistance R5; The common port of described divider resistance R4 and described divider resistance R5 is connected with the inverting input of described operational amplifier U2B, and the normal phase input end of described operational amplifier U2B inputs described reference voltage;
Described divider resistance R4 connects the second input that one end of input voltage is described under-voltage detection module, the normal phase input end of described operational amplifier U2B is the first input end of described under-voltage detection module, and the outfan of described operational amplifier U2B is the outfan of described under-voltage detection module;
The points of common connection of described divider resistance R4 and described divider resistance R5 exports the second driving voltage.
Wherein in an embodiment, described under-voltage detection module also includes diode D2; The positive pole of described diode D2 connects the outfan of described operational amplifier U2B, and negative pole connects the input of described switch control module.
Wherein in an embodiment, described switch control module includes audion Q1 and resistance R6;
Described resistance R6 mono-terminates the base stage of described audion Q1, and described resistance R6 terminates the outfan of described overvoltage detection module and the outfan of described under-voltage detection module away from the one of described audion Q1; The grounded emitter of described audion Q1, the colelctor electrode of described audion Q1 connects described main control chip.
By overvoltage detection module, above-mentioned over-and under-voltage protection circuit, at overvoltage detection module and under-voltage detection module input reference voltage, monitors whether the first driving voltage is higher than reference voltage and whether monitors the second driving voltage lower than reference voltage by under-voltage detection module. When overvoltage detection module detects the first driving voltage higher than reference voltage, overvoltage detection module controls switch control module cut-off, so that main control chip quits work. When under-voltage detection module detects the second driving voltage lower than reference voltage, under-voltage detection module controls switch control module cut-off, so that main control chip quits work. Thus realizing the protection to main control chip when the abnormal phenomenas such as over-and under-voltage occur, it is to avoid main control chip is damaged.
Accompanying drawing explanation
Fig. 1 is the module map of over-and under-voltage protection circuit;
Fig. 2 is the schematic diagram of over-and under-voltage protection circuit.
Detailed description of the invention
As it is shown in figure 1, protect the module map of circuit for over-and under-voltage.
A kind of over-and under-voltage protection circuit, including reference voltage module 101, overvoltage detection module 103, under-voltage detection module 105 and switch control module 107.
Described reference voltage module 101 is for being converted to reference voltage by supply voltage, and described reference voltage is input to described overvoltage detection module 103 and described under-voltage detection module 105.
Described overvoltage detection module 103 includes for connecing the first input end of input voltage, the second input of input reference voltage and the outfan being connected with the input of described switch control module 107.
Described under-voltage detection module 105 includes the first input end for input reference voltage, for the second input connecing input voltage and the outfan being connected with the input of described switch control module 107.
The outfan of described switch control module 107 is for being connected with main control chip.
Wherein, described overvoltage detection module 103 is used for converting input voltage into the first driving voltage, when described first driving voltage is higher than described reference voltage, described overvoltage detection module 103 controls the cut-off of described switch control module, and the main control chip being connected with described switch control module 107 quits work.
Described under-voltage detection module 105 is used for converting input voltage into the second driving voltage, when described second driving voltage is lower than described reference voltage, described under-voltage detection module 105 controls described switch control module 107 to be ended, and the main control chip being connected with described switch control module 107 quits work.
The reference voltage that supply voltage is converted to overvoltage detection module 103 by reference voltage module 101 and under-voltage detection module 105 needs.
Overvoltage detection module 103 controls conducting and the cut-off of switch control module 107 according to the reference voltage inputted and the first driving voltage. Wherein, when the first driving voltage is higher than the first reference voltage, now main control chip is in overvoltage condition. Therefore, overvoltage detection module 103 controls switch control module 107 to be ended, thus the main control chip being connected with switch control module 107 quits work, to reach the effect of protection main control chip. When the first driving voltage is lower than reference voltage, switch control module 107 turns on, and main control chip voltage does not have overvoltage.
Under-voltage detection module 105 controls conducting and the cut-off of switch control module 107 according to the reference voltage inputted and the second driving voltage. Wherein, when the second driving voltage is lower than reference voltage, now main control chip is in under-voltage condition. Therefore, under-voltage detection module 105 controls switch control module 107 to be ended, thus the main control chip being connected with switch control module 107 quits work, to reach to avoid main control chip to occur that main control chip is caused damage by big electric current because of under-voltage condition. When the second driving voltage is higher than reference voltage, switch control module 107 turns on, and main control chip voltage is not under-voltage.
Therefore, only at the first driving voltage lower than reference voltage, and when the second driving voltage is higher than reference voltage, switch control module 107 turns on, and main control chip ability normal operation, namely the voltage of main control chip is in normal range.
Incorporated by reference to Fig. 2.
Reference voltage module 101 includes resistance R1, three-terminal voltage-stabilizing pipe U1.
Described resistance R1 mono-terminates supply voltage, another terminate described three-terminal voltage-stabilizing pipe U1 negative electrode, the plus earth of described three-terminal voltage-stabilizing pipe U1, the control end of described three-terminal voltage-stabilizing pipe U1 be connected with negative electrode after output reference voltage.
Overvoltage detection module 103 includes operational amplifier U2A, divider resistance R2 and divider resistance R3.
Described divider resistance R2 and described divider resistance R3 is series between input voltage and earth terminal, and described divider resistance R2 connects input voltage away from one end of described divider resistance R3; The common port of described divider resistance R2 and described divider resistance R3 is connected with the normal phase input end of described operational amplifier U2A, and the inverting input of described operational amplifier U2A inputs described reference voltage.
Described divider resistance R2 connects the first input end that one end of described input voltage is described overvoltage detection module 103, the inverting input of described operational amplifier U2A is the second input of described overvoltage detection module 103, and the outfan of described operational amplifier U2A is the outfan of described overvoltage detection module 103.
The points of common connection of described divider resistance R2 and described divider resistance R3 exports the first driving voltage.
Overvoltage detection module 103 also includes diode D1; The positive pole of described diode D1 connects the outfan of described operational amplifier U2A, and negative pole connects the input of described switch control module 107.
Under-voltage detection module 105 includes operational amplifier U2B, divider resistance R4 and divider resistance R5.
Described divider resistance R4 and described divider resistance R5 is series between input voltage and earth terminal, and described divider resistance R4 connects input voltage away from one end of described divider resistance R5; The common port of described divider resistance R4 and described divider resistance R5 is connected with the inverting input of described operational amplifier U2B, and the normal phase input end of described operational amplifier U2B inputs described reference voltage.
Described divider resistance R4 connects the second input that one end of input voltage is described under-voltage detection module 105, the normal phase input end of described operational amplifier U2B is the first input end of described under-voltage detection module 105, and the outfan of described operational amplifier U2B is the outfan of described under-voltage detection module 105.
The points of common connection of described divider resistance R4 and described divider resistance R5 exports the second driving voltage.
Under-voltage detection module 105 also includes diode D2; The positive pole of described diode D2 connects the outfan of described operational amplifier U2B, and negative pole connects the input of described switch control module 107.
Switch control module 107 includes audion Q1 and resistance R6.
Described resistance R6 mono-terminates the base stage of described audion Q1, and described resistance R6 terminates the outfan of described overvoltage detection module 103 and the outfan of described under-voltage detection module 105 away from the one of described audion Q1; The grounded emitter of described audion Q1, the colelctor electrode of described audion Q1 connects described main control chip.
Based on above-mentioned all embodiments, the operation principle of over-and under-voltage protection circuit is as follows:
The output voltage of supply voltage, via after resistance R1 and three-terminal voltage-stabilizing pipe U1, is converted to the reference voltage needed for overvoltage detection module 103 and under-voltage detection module 105 by supply voltage. Concrete, the common port output of resistance R1 and three-terminal voltage-stabilizing pipe U1 is reference voltage.
Divider resistance R2 and divider resistance R3, divider resistance R4 and divider resistance R5 convert the first driving voltage and the second driving voltage to respectively by input voltage, and corresponding output is to operational amplifier U2A and operational amplifier U2B. Specifically, the common port after divider resistance R4 and divider resistance R5 series connection is connected with the inverting input of operational amplifier U2B, and the common port after divider resistance R2 and divider resistance R3 series connection is connected with the inverting input of operational amplifier U2A.
Operational amplifier U2A and operational amplifier U2B will compare with reference voltage via the first driving voltage after divider resistance dividing potential drop, the second driving voltage respectively.
When the first driving voltage of the inverting input of operational amplifier U2A is higher than reference voltage, operational amplifier U2A exports high level, after high level transmits via diode D1 and divider resistance R6, export to the base stage of audion Q1, audion Q1 turns on, and the main control chip being connected with the colelctor electrode of audion Q1 quits work.
When second driving voltage of inverting input of operational amplifier U2B is lower than reference voltage, operational amplifier U2B exports high level, after high level transmits via diode D2 and divider resistance R6, export to the base stage of audion Q1, audion Q1 turns on, and the main control chip being connected with the colelctor electrode of audion Q1 quits work.
Thus, when input voltage overvoltage occurs or be under-voltage, overvoltage detection module 103 and under-voltage detection module 105 correspondence make the action controlling switch control module 107 cut-off, make main control chip quit work, thus reaching the purpose of protection main control chip.
By overvoltage detection module 103, above-mentioned over-and under-voltage protection circuit, at overvoltage detection module 103 and under-voltage detection module 105 input reference voltage, monitors whether the first driving voltage is higher than reference voltage and whether monitors the second driving voltage lower than reference voltage by under-voltage detection module 105. When overvoltage detection module 103 detects the first driving voltage higher than reference voltage, overvoltage detection module 103 controls switch control module 107 to be ended, so that main control chip quits work. When under-voltage detection module 105 detects the second driving voltage lower than reference voltage, under-voltage detection module 105 controls switch control module 107 to be ended, so that main control chip quits work. Thus realizing the protection to main control chip when the abnormal phenomenas such as over-and under-voltage occur, it is to avoid main control chip is damaged.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention. It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1. an over-and under-voltage protection circuit, it is characterised in that include reference voltage module, overvoltage detection module, under-voltage detection module and switch control module;
Described reference voltage module is for being converted to reference voltage by supply voltage, and described reference voltage is input to described overvoltage detection module and described under-voltage detection module;
Described overvoltage detection module includes for connecing the first input end of input voltage, the second input of input reference voltage and the outfan being connected with the input of described switch control module;
Described under-voltage detection module includes the first input end for input reference voltage, for the second input connecing input voltage and the outfan being connected with the input of described switch control module;
The outfan of described switch control module is for being connected with main control chip;
Wherein, described overvoltage detection module is used for converting input voltage into the first driving voltage, when described first driving voltage is higher than described reference voltage, described overvoltage detection module controls the cut-off of described switch control module, and the main control chip being connected with described switch control module quits work;
Described under-voltage detection module is used for converting input voltage into the second driving voltage, when described second driving voltage is lower than described reference voltage, described under-voltage detection module controls the cut-off of described switch control module, and the main control chip being connected with described switch control module quits work.
2. the over-and under-voltage protection circuit of driving power supply according to claim 1, it is characterised in that described reference voltage module includes resistance R1, three-terminal voltage-stabilizing pipe U1;
Described resistance R1 mono-terminates supply voltage, another terminate described three-terminal voltage-stabilizing pipe U1 negative electrode, the plus earth of described three-terminal voltage-stabilizing pipe U1, the control end of described three-terminal voltage-stabilizing pipe U1 be connected with negative electrode after output reference voltage.
3. the over-and under-voltage protection circuit of driving power supply according to claim 1, it is characterised in that described overvoltage detection module includes operational amplifier U2A, divider resistance R2 and divider resistance R3;
Described divider resistance R2 and described divider resistance R3 is series between input voltage and earth terminal, and described divider resistance R2 connects input voltage away from one end of described divider resistance R3; The common port of described divider resistance R2 and described divider resistance R3 is connected with the normal phase input end of described operational amplifier U2A, and the inverting input of described operational amplifier U2A inputs described reference voltage;
Described divider resistance R2 connects the first input end that one end of input voltage is described overvoltage detection module, the inverting input of described operational amplifier U2A is the second input of described overvoltage detection module, and the outfan of described operational amplifier U2A is the outfan of described overvoltage detection module;
The points of common connection of described divider resistance R2 and described divider resistance R3 exports the first driving voltage.
4. the over-and under-voltage protection circuit of driving power supply according to claim 3, it is characterised in that described overvoltage detection module also includes diode D1; The positive pole of described diode D1 connects the outfan of described operational amplifier U2A, and negative pole connects the input of described switch control module.
5. the over-and under-voltage protection circuit of driving power supply according to claim 1, it is characterised in that described under-voltage detection module includes operational amplifier U2B, divider resistance R4 and divider resistance R5;
Described divider resistance R4 and described divider resistance R5 is series between input voltage and earth terminal, and described divider resistance R4 connects input voltage away from one end of described divider resistance R5; The common port of described divider resistance R4 and described divider resistance R5 is connected with the inverting input of described operational amplifier U2B, and the normal phase input end of described operational amplifier U2B inputs described reference voltage;
Described divider resistance R4 connects the second input that one end of input voltage is described under-voltage detection module, the normal phase input end of described operational amplifier U2B is the first input end of described under-voltage detection module, and the outfan of described operational amplifier U2B is the outfan of described under-voltage detection module;
The points of common connection of described divider resistance R4 and described divider resistance R5 exports the second driving voltage.
6. the over-and under-voltage protection circuit of driving power supply according to claim 5, it is characterised in that described under-voltage detection module also includes diode D2; The positive pole of described diode D2 connects the outfan of described operational amplifier U2B, and negative pole connects the input of described switch control module.
7. the over-and under-voltage protection circuit of driving power supply according to claim 1, it is characterised in that described switch control module includes audion Q1 and resistance R6;
Described resistance R6 mono-terminates the base stage of described audion Q1, and described resistance R6 terminates the outfan of described overvoltage detection module and the outfan of described under-voltage detection module away from the one of described audion Q1; The grounded emitter of described audion Q1, the colelctor electrode of described audion Q1 connects described main control chip.
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| CN201410584346.0A CN105633905A (en) | 2014-10-27 | 2014-10-27 | Overvoltage and under-voltage protection circuit |
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| CN201410584346.0A CN105633905A (en) | 2014-10-27 | 2014-10-27 | Overvoltage and under-voltage protection circuit |
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| CN106571803A (en) * | 2016-10-19 | 2017-04-19 | 深圳市生微电子有限公司 | Overvoltage detection circuit |
| CN106602533A (en) * | 2016-12-14 | 2017-04-26 | 安徽长龙电气集团有限公司 | Overvoltage protection circuit used for power distribution cabinet |
| CN106872765A (en) * | 2017-04-10 | 2017-06-20 | 浦北县金洋电厨具有限公司 | Input voltage measurement device |
| CN107706888A (en) * | 2017-09-05 | 2018-02-16 | 河南省大方重型机器有限公司 | A kind of crane travel switch contact force protection circuit |
| CN109149521A (en) * | 2018-08-09 | 2019-01-04 | 珠海格力电器股份有限公司 | Overvoltage protection device, motor and overvoltage protection method thereof |
| CN111190118A (en) * | 2018-11-15 | 2020-05-22 | 华润微电子（重庆）有限公司 | Battery management system and fault detection circuit of switch module grid driving voltage thereof |
| WO2021114073A1 (en) * | 2019-12-09 | 2021-06-17 | 深圳市众能达自动化设备有限公司 | Detection circuit for flash fire in capacitor or battery, and detection method therefor |
| CN113220056A (en) * | 2021-03-29 | 2021-08-06 | 惠州市华阳光学技术有限公司 | Load voltage protection circuit and electronic device |
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| CN106571803A (en) * | 2016-10-19 | 2017-04-19 | 深圳市生微电子有限公司 | Overvoltage detection circuit |
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| CN107706888A (en) * | 2017-09-05 | 2018-02-16 | 河南省大方重型机器有限公司 | A kind of crane travel switch contact force protection circuit |
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| CN109149521A (en) * | 2018-08-09 | 2019-01-04 | 珠海格力电器股份有限公司 | Overvoltage protection device, motor and overvoltage protection method thereof |
| CN111190118A (en) * | 2018-11-15 | 2020-05-22 | 华润微电子（重庆）有限公司 | Battery management system and fault detection circuit of switch module grid driving voltage thereof |
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| WO2021114073A1 (en) * | 2019-12-09 | 2021-06-17 | 深圳市众能达自动化设备有限公司 | Detection circuit for flash fire in capacitor or battery, and detection method therefor |
| CN113220056A (en) * | 2021-03-29 | 2021-08-06 | 惠州市华阳光学技术有限公司 | Load voltage protection circuit and electronic device |
| CN113220056B (en) * | 2021-03-29 | 2022-04-19 | 惠州市华阳光学技术有限公司 | Load voltage protection circuit and electronic device |
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| RJ01 | Rejection of invention patent application after publication |