CN102694362A - Over-current protection circuit and main board - Google Patents
Over-current protection circuit and main board Download PDFInfo
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- CN102694362A CN102694362A CN2011100707273A CN201110070727A CN102694362A CN 102694362 A CN102694362 A CN 102694362A CN 2011100707273 A CN2011100707273 A CN 2011100707273A CN 201110070727 A CN201110070727 A CN 201110070727A CN 102694362 A CN102694362 A CN 102694362A
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- current
- comparator
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- level signal
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Abstract
The present invention relates to an over-current protection circuit which comprises an input terminal, an output terminal, a first resistor, a second resistor, a current source, a comparator and a reference voltage terminal. The first resistor, the second resistor and the current source are in series connection in order between the input terminal and the ground. The reference voltage terminal is connected to a node of the first resistor and the second resistor. A first input terminal of the comparator is connected to a node of the second resistor and the current source. A second input terminal of the comparator is connected to the input terminal. The output terminal is an output terminal of the comparator. When input current of the input terminal is larger than preset current, the output terminal outputs a level signal which expresses that the input current is larger than the preset current. The level signal can be used by a complex programmable logic device of a main board, in the condition of over-current, the main board can stop the working of electronic components, and a purpose of protecting a user and a computer system is achieved.
Description
Technical field
The present invention relates to a kind of current foldback circuit and have the mainboard of this current foldback circuit.
Background technology
At computer system (computer system), in server (server), computer power supply is responsible for each electronic installation on mainboard and mainboard (like central processing unit etc.) operating voltage is provided.In general, any one road output current of power supply does not all allow to surpass a corresponding design load, as 6 amperes.If so the output current of power supply is kept more than one minute and may be caused danger to user and computer system greater than this design load.
Summary of the invention
In view of above content, the mainboard that is necessary that a kind of current foldback circuit is provided and has this current foldback circuit, it can protect user and computer system.
A kind of current foldback circuit, it comprises input, output, first resistance, second resistance, current source, comparator and reference voltage end.This first resistance, this second resistance and this current source are connected between this input and the ground successively; This reference voltage end is connected on the node of this first resistance and this second resistance; The first input end of this comparator is connected on the node of this second resistance and this current source; Second input of this comparator is connected to this input; This output is the output of this comparator, when the input current of this input when setting electric current, this this input current of output output expression is set the level signal of electric current greater than this.
A kind of mainboard; It comprises above-mentioned current foldback circuit and CPLD; This output connects the input of this CPLD; When this CPLD receives this input current of expression greater than this level signal of this setting electric current, be used to block enable signal in order to the preset electronic component operating voltage of exporting this mainboard.
Compared to prior art; Mainboard of the present invention utilizes the current foldback circuit monitor current so that under the situation of overcurrent, block the enable signal in order to output electronic component operating voltage; Thereby stop the work of this electronic component, and then reach protection user and computer system purpose.
Description of drawings
Fig. 1 is the circuit module sketch map of a kind of mainboard of providing of first embodiment of the invention.
Fig. 2 is the circuit module sketch map of a kind of mainboard of providing of second embodiment of the invention.
Fig. 3 is the circuit module sketch map of a kind of mainboard of providing of third embodiment of the invention.
Fig. 4 is the circuit module sketch map of a kind of mainboard of providing of four embodiment of the invention.
The main element symbol description
| |
100，400，500，700 |
| |
10 |
| |
20 |
| |
101，201，401，701 |
| |
102，202，402，702 |
| First resistance | R1 |
| Second resistance | R2 |
| Current source | Is |
| |
30，60，70，80 |
| |
103 |
| |
301，601，801 |
| |
302，602，802 |
| First power end | 303 |
| The second source end | 304，704，804 |
| Positive supply | V+ |
| Negative supply | V- |
Following embodiment will combine above-mentioned accompanying drawing to further specify the present invention.
Embodiment
See also Fig. 1, a kind of mainboard 100 that first embodiment of the invention provides comprises current foldback circuit 10 and CPLD 20 (complex programmable logic device).
This current foldback circuit 10 comprises input 101, output 102, first resistance R 1, second resistance R 2, current source Is, comparator 30 and reference voltage end 103.
This first resistance R 1, this second resistance R 2 and this current source Is are connected between this input 101 and the ground successively, and this reference voltage end 103 is connected on the node of this first resistance R 1 and this second resistance R 2.This reference voltage end 103 can be connected to a positive supply, as the power supply of positive voltage is provided.
The first input end 301 of this comparator 30 is connected on the node of this second resistance R 2 and this current source Is, and second input 302 of this comparator 30 is connected to this input 101.In this execution mode, this first input end 301 is the in-phase input end of this comparator 30, and this second input 302 is the inverting input of this comparator 30.This output 102 is the output of this comparator 30.First power end 303 of this comparator 30 is used to connect positive supply, second source end 304 ground connection of this comparator 30.
In this execution mode, the resistance value of first resistance R 1 equals the resistance value of second resistance R 2.Input current I when this input 101
1During greater than the setting electric current, then this input current I are represented in these output 102 outputs
1Set the level signal of electric current greater than this.
Particularly, the voltage V of second input 302
302=V
103+ (I
1* R
1), the voltage V of first input end 301
301=V
103+ (I
2* R
2), wherein, V
103Be the voltage through reference voltage end 103 inputs, I
1Be the current value (promptly flow through the current value of first resistance R 1) of monitored power supply through input 101 inputs, I
2Be the current value (promptly flowing through the current value of second resistance R 2) that current source Is provides, R
1Be the resistance value of first resistance R 1, R
2It is the resistance value of second resistance R 2.Input current I when this input 101
1During greater than the setting electric current, V is arranged then
302＞V
301, the output 102 output low level signals of comparator 30; Input current I when this input 101
1During less than the setting electric current, V is arranged then
302＜V
301, the output 102 output high level signals of comparator 30.In addition, can be through the R of different sizes be set
1, R
2, I
2Come input current I to different sizes
1Monitor, so the flexibility of this current foldback circuit 10 is higher.
The input 201 of this CPLD 20 is connected with the output 102 of comparator 30 to receive the level signal of current foldback circuit 10 outputs.When receiving this input current of expression I
1During greater than the level signal of this setting electric current (this execution mode is a low level signal); This CPLD 20 blocks in order to export the preset electronic component of this mainboard 100 through its output 202; Enable signal like the central processing unit operating voltage; Thereby stop the work of this preset electronic component, and then reach protection user and computer system purpose.
See also Fig. 2; A kind of mainboard 400 that second embodiment of the invention provides; Mainboard 100 differences in itself and first execution mode are: the first input end 601 of the comparator 60 of this mainboard 400 is the inverting input of comparator 60; Second input 602 is the in-phase input end of this comparator 60, therefore, and as the input current I of this input 401
1During greater than the setting electric current, then this input current I are represented in output 402 outputs
1Level signal greater than this setting electric current is a high level signal; Input current I when this input 401
1During less than the setting electric current, then this input current I are represented in output 402 outputs
1Level signal less than this setting electric current is a low level signal.
See also Fig. 3, a kind of mainboard 500 that third embodiment of the invention provides, it is with mainboard 100 differences in first execution mode: the second source end 704 of the comparator 70 of this mainboard 500 is used to be connected negative supply.
See also Fig. 4; A kind of mainboard 700 that four embodiment of the invention provides; It is with mainboard 100 differences in first execution mode: the second source end 804 of the comparator 80 of this mainboard 700 is used to be connected negative supply; The first input end 801 that reaches comparator 80 is the inverting input of comparator 80, and second input 802 is the in-phase input end of this comparator 80.Therefore, as the input current I of this input 701
1During greater than the setting electric current, then this input current I are represented in output 702 outputs
1Level signal greater than this setting electric current is a high level signal; Input current I when this input 701
1During less than the setting electric current, then this input current I are represented in output 702 outputs
1Level signal less than this setting electric current is a low level signal.
In addition, those skilled in the art can also do other variation in spirit of the present invention.Certainly, these all should be included within the present invention's scope required for protection according to the variation that the present invention's spirit is done.
Claims (10)
1. current foldback circuit; It comprises input, output, first resistance, second resistance, current source, comparator and reference voltage end; This first resistance, this second resistance and this current source are connected between this input and the ground successively; This reference voltage end is connected on the node of this first resistance and this second resistance; The first input end of this comparator is connected on the node of this second resistance and this current source, and second input of this comparator is connected to this input, and this output is the output of this comparator; When the input current of this input when setting electric current, this this input current of output output expression is set the level signal of electric current greater than this.
2. current foldback circuit as claimed in claim 1 is characterized in that: this first input end is the in-phase input end of this comparator, and this second input is the inverting input of this comparator.
3. current foldback circuit as claimed in claim 2 is characterized in that: represent that this input current is a low level signal greater than this level signal of this setting electric current.
4. current foldback circuit as claimed in claim 3 is characterized in that: when this input current during less than this setting electric current, this input current of expression of this output output is a high level signal less than the level signal of this setting electric current.
5. current foldback circuit as claimed in claim 1 is characterized in that: this first input end is the inverting input of this comparator, and this second input is the in-phase input end of this comparator.
6. current foldback circuit as claimed in claim 5 is characterized in that: represent that this input current is a high level signal greater than this level signal of this setting electric current.
7. current foldback circuit as claimed in claim 6 is characterized in that: when this input current during less than this setting electric current, then this input current of expression of this output output is a low level signal less than this level signal of this setting electric current.
8. current foldback circuit as claimed in claim 1 is characterized in that: this comparator also comprises first power end and second source end, and this first power end is used to connect positive supply, this second source end ground connection.
9. current foldback circuit as claimed in claim 1 is characterized in that: this comparator also comprises first power end and second source end, and this first power end is used to connect positive supply, and this second source end is used to connect negative supply.
10. mainboard; It comprises each described current foldback circuit and CPLD like claim 1-9; This output connects the input of this CPLD; When this CPLD receives this input current of expression greater than this level signal of this setting electric current, be used to block enable signal in order to the preset electronic component operating voltage of exporting this mainboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100707273A CN102694362A (en) | 2011-03-23 | 2011-03-23 | Over-current protection circuit and main board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100707273A CN102694362A (en) | 2011-03-23 | 2011-03-23 | Over-current protection circuit and main board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102694362A true CN102694362A (en) | 2012-09-26 |
Family
ID=46859680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100707273A Pending CN102694362A (en) | 2011-03-23 | 2011-03-23 | Over-current protection circuit and main board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102694362A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106844080A (en) * | 2016-12-29 | 2017-06-13 | 郑州云海信息技术有限公司 | A kind of method for improving server overcurrent protection false triggering |
| CN113419592A (en) * | 2021-06-25 | 2021-09-21 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2544433Y (en) * | 2002-05-30 | 2003-04-09 | 邱伟朝 | Power supply socket with leakage and over current protection |
| US20080284403A1 (en) * | 2007-05-17 | 2008-11-20 | Analog Devices, Inc. | High-side current sense circuit with common-mode voltage reduction |
| US7622902B1 (en) * | 2008-09-25 | 2009-11-24 | Advanced Analog Technology, Inc. | Low drop out regulator with over-current protection |
| CN101867177A (en) * | 2010-07-02 | 2010-10-20 | 深圳市四方电气技术有限公司 | Over-voltage and over-current hardware protection circuit and DC power supply circuit |
-
2011
- 2011-03-23 CN CN2011100707273A patent/CN102694362A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2544433Y (en) * | 2002-05-30 | 2003-04-09 | 邱伟朝 | Power supply socket with leakage and over current protection |
| US20080284403A1 (en) * | 2007-05-17 | 2008-11-20 | Analog Devices, Inc. | High-side current sense circuit with common-mode voltage reduction |
| US7622902B1 (en) * | 2008-09-25 | 2009-11-24 | Advanced Analog Technology, Inc. | Low drop out regulator with over-current protection |
| CN101867177A (en) * | 2010-07-02 | 2010-10-20 | 深圳市四方电气技术有限公司 | Over-voltage and over-current hardware protection circuit and DC power supply circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106844080A (en) * | 2016-12-29 | 2017-06-13 | 郑州云海信息技术有限公司 | A kind of method for improving server overcurrent protection false triggering |
| CN113419592A (en) * | 2021-06-25 | 2021-09-21 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
| CN113419592B (en) * | 2021-06-25 | 2023-02-28 | Tcl华星光电技术有限公司 | Overcurrent protection circuit, power supply circuit and display device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120926 |