CN101425031B - Multi voltage reference position detection circuit - Google Patents
Multi voltage reference position detection circuit Download PDFInfo
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- CN101425031B CN101425031B CN2007101651419A CN200710165141A CN101425031B CN 101425031 B CN101425031 B CN 101425031B CN 2007101651419 A CN2007101651419 A CN 2007101651419A CN 200710165141 A CN200710165141 A CN 200710165141A CN 101425031 B CN101425031 B CN 101425031B
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- door
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Abstract
The invention discloses a multivoltage level detection circuit, comprising comparators, a first resistor, a power signal input port and an or gate. The power signal and the first resistor are connected with the comparators; the or gate is connected with the output ends of the comparators; and the or gate outputs a good signal of a first power according to the comparative result of the comparator.
Description
Technical field
The present invention relates to a kind of test circuit of mainboard power supply signal, particularly relate to the mainboard power supply signal test circuit of a plurality of voltage quasi positions of a kind of tool.
Background technology
When main frame was activated, the power-supply unit of main frame (Power Supply Unit) can carry out one time selftest earlier.If all electric current and voltage reaches default value, power-supply unit can send a power supply good signal (Power Good) signal and give motherboard.Microprocessor then can be in rebooting status (reset) always, receives the power supply good signal up to the time of microprocessor control chip.
Therefore the voltage source of legacy hosts plate only provides a voltage quasi position usually, and traditional motherboard only needs the test voltage source whether to reach this voltage quasi position to get final product.But if voltage source need provide plural voltage quasi position, then whether the test voltage source that motherboard can't be correct reaches and has arrived required voltage quasi position.
Therefore need a new multi voltage reference position detection circuit, when voltage source need provide plural voltage quasi position, whether correct detection voltage source reached required voltage quasi position.
Summary of the invention
The object of the present invention is to provide a kind of multi voltage reference position detection circuit, be applicable to the motherboard of the accurate position of tool multiple voltage, whether the voltage quasi position that can record each power supply signal conforms with expection.
Another object of the present invention is to provide a kind of multi voltage reference position detection circuit, be applicable to the motherboard with at least two voltage quasi positions, whether the voltage quasi position that can record each power supply signal conforms with expection.
To achieve these goals, the invention provides a kind of multi voltage reference position detection circuit, comprise several have the comparer of several positive-negative input ends, several first resistance, a power supply signal input port, one or door, a delay circuit and one with.Power supply signal input port and first resistance electrically connect comparer, and those positive-negative input ends of those comparers electrically connect this power supply signal input port or those first resistance accordingly respectively.Or the output terminal of each comparer of door electric connection, this or door are exported one first power supply good signal according to the comparative result of comparer.Delay circuit electrically connects this power supply signal input port.Electrically connect an output terminal and this delay circuit of this or door with door, should export a second source good signal with door.
To achieve these goals, the present invention also provides a kind of multi voltage reference position detection circuit to comprise one first resistance, one second resistance, one the 3rd resistance, one the 4th resistance, one first comparer, one second comparer, one the 3rd comparer and one or door.
First resistance, second resistance, the 3rd resistance and the 4th resistance serial connection produce the accurate position of one first voltage quasi position, one second voltage quasi position and a tertiary voltage with dividing potential drop one reference voltage.First comparer electrically connects first resistance and second resistance, the magnitude of voltage and first voltage quasi position of a power supply signal that is provided with a power supply signal input port relatively.Second comparer electrically connects second resistance and the 3rd resistance, with the relatively magnitude of voltage and second voltage quasi position of this power supply signal.The 3rd comparer electrically connects the 3rd resistance and the 4th resistance, with the magnitude of voltage and the accurate position of tertiary voltage of this power supply signal relatively.Or door then electrically connects first comparer, second comparer and the 3rd comparer.This one or door produce one first power supply good signal according to the comparative result of comparer.
According to the foregoing description, whether a plurality of voltage quasi positions that multi voltage reference position detection circuit of the present invention can record power supply signal conform with expection.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Figure 1A is the truth table that illustrates one embodiment of the invention power supply good signal;
Figure 1B is the Karnaugh map that illustrates one embodiment of the invention power supply good signal;
Fig. 2 is the logical circuitry that illustrates one embodiment of the invention multi voltage reference position detection circuit;
Fig. 3 A is the truth table that illustrates another embodiment of the present invention power supply good signal;
Fig. 3 B is the Karnaugh map that illustrates another embodiment of the present invention power supply good signal.
Fig. 4 is the logical circuitry that illustrates another embodiment of the present invention multi voltage reference position detection circuit.
Wherein, Reference numeral:
201: reference voltage input terminal mouth 203: the power supply signal input port
205,207,209: comparer
211: or door 213: impact damper
215: with door 217: output port
219: delay circuit 401: the reference voltage input terminal mouth
403: the power supply signal input port
405,407,409,411: comparer
413: or door 415: impact damper
417: with door 419: output port
421: delay circuit R1 ~ R5: resistance
R7: postpone resistance C1: electric capacity
Embodiment
The multi voltage reference position detection circuit of following examples is applicable to the motherboard with the accurate position of multiple voltage, can record the accurate position of mainboard power supply voltage of signals and whether conform with expection.
Please refer to Figure 1A, it is the truth table of one embodiment of the invention power supply good signal.In this truth table, A, B, C represent the output valve or the anti-phase output valve of three comparers respectively.PGD represents the power supply good signal.The numerical value of power supply good signal is 1 to represent the voltage quasi position of power supply signal to conform with expection, otherwise then represents power supply signal not reach the accurate position of expection as yet.
When the numerical value of A, B, C equals 0,0,1 respectively, represent the magnitude of voltage of power supply signal to reach first voltage quasi position, making power supply good signal numerical value is 1.When the numerical value of A, B, C equals 1,1,1, represent the magnitude of voltage of power supply signal to reach second voltage quasi position, power supply good signal numerical value is similarly 1.Relative, when the numerical value of A, B, C equals 0,0,0 respectively, represent the magnitude of voltage of power supply signal not reach first voltage quasi position as yet, making power supply good signal numerical value is 0.When the numerical value of A, B, C equals 0,1,1 respectively, represent the magnitude of voltage of power supply signal to surpass first voltage quasi position, but do not reach second voltage quasi position as yet, therefore making power supply good signal numerical value also is 0.
Because whether A, the B of above-mentioned four combinations, two voltage quasi positions that C numerical value can detect the power supply good signal conform with expection, the numerical value of other power supply good signal (symbol X) then can be chosen as 0 or 1 according to circumstances.
Please refer to Figure 1B, it is the Karnaugh map of one embodiment of the invention power supply good signal.In this Karnaugh map, the numerical value of A is represented on first hurdle, and first row are then represented the numerical value of B, C, and other field in the Karnaugh map is then represented the numerical value of power supply good signal.In order to realize simplifying the required logical circuit of power supply good signal, we make the numerical value of Karnaugh map upper part X (don ' t care) is 1.The Boolean function that therefore can obtain power supply good signal PGD is A+BC.
Please refer to Fig. 2, it is the logical circuitry of one embodiment of the invention multi voltage reference position detection circuit.The logical circuit of power supply good signal comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, reference voltage input terminal mouth 201, power supply signal input port 203 and output port 217.Reference voltage input terminal mouth 201 provides a reference voltage.Resistance R 1, R2, R3 and R4 are connected in series the dividing potential drop reference voltage, to produce the accurate position of first voltage quasi position, second voltage quasi position and a tertiary voltage.Or door 211 output is power supply good signal (PGD), this power supply good signal via with door 215 after again by output port 217 outputs.
As shown in the figure, the positive-negative input end of first comparer 205, second comparer 207 and the 3rd comparer 209 electrically connects power supply signal input port 203 and corresponding resistor, come the magnitude of voltage of comparison first voltage quasi position, second voltage quasi position, the accurate position of tertiary voltage and power supply signal, and produce A, B, C according to this.Or door 211 is electrically connected to above-mentioned three comparers.When A, B, C have one at least when the logical one, or door 211 can to produce logic levels be 1 power supply good signal, and by output port 217 out-put supply good signals.
If the scheduled voltage of power supply signal is second logic level, should wait for that power supply signal rises to second logic level, or the power supply good signal of door 211 outputs just is 1 signal for logic level.Yet when the magnitude of voltage of power supply signal rises to first logic level, but when not reaching second logic level, or door 211 still may output logic 1, makes motherboard think that the magnitude of voltage of power supply signal has risen to the accurate position of second logic by mistake.Risen to second logic level for fear of motherboard misidentification power supply signal, multi voltage reference position detection circuit set up delay circuit 219 with door 215, wait for just activation and door 215 when power supply signal rises above first logic level, make and 215 an out-put supply good signal.That is to say, postponed with door 215 and delay circuit 219 or the door 211 power supply good signals of being exported (PGD).
Output terminal and delay circuit 219 with door 215 electric connections or door 211.Delay circuit 219 mainly comprises impact damper 213, postpones resistance R7, and capacitor C 1.Postpone resistance R7 electrically connect impact damper 213 with door 215,1 of capacitor C electrically connect postpone resistance R7 with door 215.Select the suitable delay resistance R7 and the resistance value of capacitor C 1, can surpass just activation and door 215 after the accurate position of first logic, make motherboard can not think first logic level by mistake second logic level at the magnitude of voltage of power supply signal.
Please refer to Fig. 3 A, it is the truth table of another embodiment of the present invention power supply good signal.In this truth table, A, B, C, D represent the output valve or the anti-phase output valve of four comparers respectively.PGD represents the power supply good signal equally.Compare the truth table of Figure 1A, the judgement of overvoltage that the truth table of Fig. 3 A is many.That is to say that when the magnitude of voltage of power supply signal is too much above the accurate position of second logic (for example accurate of second logic is 5V, and power supply signal has risen to 7V), the numerical value that makes the power supply good signal is 0, represents that this power supply good signal is not as expection.
On behalf of the magnitude of voltage of power supply signal, the truth table of similar Figure 1A when A, B, C, D equal 0001 or 0111, reach first voltage quasi position and second logic level respectively, and making power supply good signal numerical value is 1.When the numerical value of A, B, C, D equals 0000 and 0011, represent the magnitude of voltage of power supply signal not reach first voltage quasi position or second voltage quasi position as yet respectively.As A, B, C, when D equals 1111, represent the magnitude of voltage of power supply signal to surpass the accurate position of second logic too much, the numerical value that makes the power supply good signal is 0.Because A, the B of above-mentioned five combinations, the power supply good signal that C, D can detect two voltage levels, the numerical value of other power supply good signal (symbol X) then can be chosen as 0 or 1 according to circumstances.
Please refer to Fig. 3 B, it is the Karnaugh map of another embodiment of the present invention power supply good signal.In this Karnaugh map, the numerical value of A, B is represented on first hurdle, and first row are then represented the numerical value of C, D, and other field in the Karnaugh map is then represented the numerical value of power supply good signal.In order to realize simplifying the required logical circuit of power supply good signal, we make the numerical value of Karnaugh map upper part X (don ' t care) equal 1.The Boolean function that therefore can obtain power supply good signal PGD is AB+CD.
Please refer to Fig. 4, it is the logical circuitry of another embodiment of the present invention multi voltage reference position detection circuit.The logical circuit of power supply good signal comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, reference voltage input terminal mouth 401 and output port 419.Reference voltage input terminal mouth 401 provides a reference voltage.Resistance R 1, R2, R3, R4 and serial connection are come the dividing potential drop reference voltage, to produce first voltage quasi position, second voltage quasi position, the accurate position of tertiary voltage and the 4th voltage quasi position.
As shown in Figure 4, the positive-negative input end of first comparer 405, second comparer 407, the 3rd comparer 409 and the 4th comparer 411 electrically connects power supply signal input port 403 and corresponding resistance, come the magnitude of voltage of comparison first voltage quasi position, second voltage quasi position, the accurate position of tertiary voltage, the 4th voltage quasi position and power supply signal, and produce comparative result A, B, C and D according to this.Or door 413 electrically connects above-mentioned four comparers.When A, B, C and D have one at least when the logical one, or door 413 can output logic position standards be 1 power supply good signal, and by output port 419 these power supply good signals of output.
The multi voltage reference position detection circuit that is different from Fig. 2, when the magnitude of voltage of power supply signal surpasses the zone of reasonableness of the accurate position of second logic, output A, the B of comparer, C, D equal 0,1,0,1 (A, B, C, D equal 1111) respectively, feasible or door 413 output logic position standards are 0 power supply good signal, inform that the mainboard power supply voltage of signals exceeds zone of reasonableness.
Similar Fig. 2, the multi voltage reference position detection circuit of Fig. 4 embodiment also set up delay circuit 421 with door 417, avoid motherboard to think the accurate position of first logic by mistake second logic accurate position.Output terminal and delay circuit 421 with door 417 electric connections or door 413.Delay circuit 421 mainly comprises impact damper 415, postpones resistance R7, and capacitor C 1.Postpone resistance R7 electrically connect impact damper 415 with door 417,1 of capacitor C electrically connect postpone resistance R7 with door 417.When power supply signal rises to suitable logic level (for example power supply signal surpasses first logic level), delay circuit 421 just makes and an input end of door 417 is 1, activation and door 417 out-put supply good signals, that is to say, postponed with door 417 and delay circuit 421 or the door 413 power supply good signals of being exported (PGD).Therefore when power supply signal rose to the accurate position of first logic, motherboard just can not rise to the accurate position of second logic by the misidentification power supply signal.
In sum, multi voltage reference position detection circuit is applicable to the motherboard with the accurate position of multiple voltage, can record the mainboard power supply signal and whether conform with the accurate position of a certain predetermined voltage.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (7)
1. a multi voltage reference position detection circuit is characterized in that, comprises:
Several comparers have several positive-negative input ends;
Several first resistance electrically connect this comparer;
One power supply signal input port electrically connects each comparer, and wherein those positive-negative input ends of those comparers electrically connect this power supply signal input port or those first resistance accordingly respectively;
One or door, electrically connect an output terminal of each comparer, should or door export one first power supply good signal according to the comparative result of this comparer;
One delay circuit electrically connects this power supply signal input port; And
One with door, electrically connect an output terminal and this delay circuit of this or door, should export a second source good signal with door.
2. multi voltage reference position detection circuit according to claim 1 is characterized in that, this delay circuit comprises:
One impact damper electrically connects this power supply signal input port;
One second resistance, electrically connect this impact damper and should and door; And
One electric capacity, electrically connect this second resistance and should and door.
3. multi voltage reference position detection circuit according to claim 1 is characterized in that, also comprises a reference voltage input terminal mouth, electrically connects this comparer.
4. a multi voltage reference position detection circuit is characterized in that, comprises:
One first resistance, one second resistance, one the 3rd resistance and one the 4th resistance, those resistance serial connection dividing potential drop one reference voltages are to produce the accurate position of one first voltage quasi position, one second voltage quasi position and a tertiary voltage;
One first comparer electrically connects this first resistance and this second resistance, magnitude of voltage and this first voltage quasi position of a power supply signal that is provided with a power supply signal input port relatively;
One second comparer electrically connects this second resistance and the 3rd resistance, with relatively magnitude of voltage and this second voltage quasi position of this power supply signal;
One the 3rd comparer electrically connects the 3rd resistance and the 4th resistance, with the magnitude of voltage and the accurate position of this tertiary voltage of this power supply signal relatively; And
One or door, electrically connect this first comparer, this second comparer and the 3rd comparer, should or door produce one first power supply good signal according to the comparative result of this comparer.
5. multi voltage reference position detection circuit according to claim 4 is characterized in that, also comprises:
One delay circuit, one end electrically connect this power supply signal input port, and
One with door, electrically connect an output terminal of this or door and the other end of this delay circuit, should export a second source good signal with door.
6. multi voltage reference position detection circuit according to claim 5 is characterized in that, this delay circuit comprises:
One impact damper;
One postpones resistance, electrically connect this impact damper and should and door; And
One electric capacity, electrically connect this delay resistance and should and door.
7. multi voltage reference position detection circuit according to claim 4 is characterized in that, also comprises:
One the 5th resistance electrically connects the 4th resistance; And
One the 4th comparer electrically connects the 4th resistance and the 5th resistance, and the 4th comparer compares the magnitude of voltage of one the 4th voltage quasi position and this power supply signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101651419A CN101425031B (en) | 2007-10-29 | 2007-10-29 | Multi voltage reference position detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101651419A CN101425031B (en) | 2007-10-29 | 2007-10-29 | Multi voltage reference position detection circuit |
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| Publication Number | Publication Date |
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| CN101425031A CN101425031A (en) | 2009-05-06 |
| CN101425031B true CN101425031B (en) | 2010-07-21 |
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| CN2007101651419A Expired - Fee Related CN101425031B (en) | 2007-10-29 | 2007-10-29 | Multi voltage reference position detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI456864B (en) * | 2012-03-09 | 2014-10-11 | Acer Inc | Charging source detection switch apparatus |
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| CN102193070A (en) * | 2010-03-17 | 2011-09-21 | 鸿富锦精密工业（深圳）有限公司 | Alternating-current power supply measuring circuit |
| CN102064704B (en) * | 2010-12-27 | 2014-05-28 | 东莞市奇立电源有限公司 | Single-path multiple-voltage output power supply control method and device |
| CN102288835B (en) * | 2011-06-16 | 2013-06-19 | 四川和芯微电子股份有限公司 | Signal detection circuit and method |
| CN102882203A (en) * | 2011-07-14 | 2013-01-16 | 冠捷投资有限公司 | Power transmission system, device and protection circuit with power supply protection function |
| CN103326407A (en) * | 2012-03-22 | 2013-09-25 | 宏碁股份有限公司 | Battery charging source detection shifting device and method |
| CN104483527A (en) * | 2014-12-23 | 2015-04-01 | 浪潮电子信息产业股份有限公司 | Device and method for monitoring voltage of power distribution board |
| CN107179441A (en) * | 2017-04-28 | 2017-09-19 | 上海与德科技有限公司 | The detection circuit of mobile terminal and the module classification method based on detection circuit |
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Patent Citations (6)
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|---|---|---|---|---|
| US5656944A (en) * | 1994-11-15 | 1997-08-12 | Lg Semicon Co., Ltd. | Burn-in voltage detection circuit for semiconductor chip |
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| TWI456864B (en) * | 2012-03-09 | 2014-10-11 | Acer Inc | Charging source detection switch apparatus |
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