CN1276327C - A power control system that provides different outputs according to the working status of the computer system - Google Patents
A power control system that provides different outputs according to the working status of the computer system Download PDFInfo
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- CN1276327C CN1276327C CN 03127533 CN03127533A CN1276327C CN 1276327 C CN1276327 C CN 1276327C CN 03127533 CN03127533 CN 03127533 CN 03127533 A CN03127533 A CN 03127533A CN 1276327 C CN1276327 C CN 1276327C
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Abstract
A power control system for a computer system comprises a judgment logic circuit, a voltage division control unit and a power supply circuit. The judging logic circuit is used for detecting the state of the computer system to output a judging voltage; the voltage division control unit is used for outputting a set voltage according to the judgment voltage output by the judgment logic circuit, and comprises at least two resistors and a switch circuit, wherein the switch circuit can be switched on or switched off according to the judgment voltage output by the judgment logic circuit so as to enable the voltage division control unit to output the set voltage; the power supply circuit is used for generating an output voltage to the computer system according to the set voltage.
Description
Technical field
The present invention relates to a kind of power control system that is used for computer system, relate in particular to a kind of duty and give the power control system of computer system with decision output different operating voltage by the judgement computer system.
Background technology
In modern today of information society, personal computer has become popular contact, has handled one of numerical information most important platform.In recent years, in order to satisfy the demands of consumers, more diversified individual digital treating apparatus constantly arises at the historic moment, and comprises PDA(Personal Digital Assistant), mobile computer (Notebook computer) or the like.Concerning many needs carried out the worker of travel for commercial purpose, these portable computer systems are indispensable important helper in their work especially.But help oneself work in order in tediously long travelling process, still to use these portable computer systems, these computer systems itself have the supply battery so that its normal running to be provided, yet, the reserve power of battery is also quite limited, so portable computer system is in the process that moves, the time that can use is not abundant in fact.Therefore how to increase the time that battery provides electric power, just become the problem that the computer system dealer makes great efforts to overcome.
See also Fig. 1, Fig. 1 shows the functional block diagram of conventional computer system 10.Computer system 10 comprises that a processor 12, a power supply provide circuit 14, a battery 16 and a partial pressure unit 18.Processor 12 is used to control the running of whole computer system 10, battery 16 is used to provide galvanic current to press Vin, and, export a setting voltage Vset and provide circuit 14, be i.e. setting voltage Vset=Vin*R2/ (R1+R2) to power supply via after two resistance R 1 of partial pressure unit 18, the R2 dividing potential drop.And power supply provides circuit 14 to be used for big or small output services voltage Vout according to setting voltage Vset to the processor 12 of computer system 10 and other electronic package.If setting voltage Vset is big more, then Shu Chu operating voltage Vout also can be big more.
Yet, the use habit of most computer system is to be used to be the copy editor mostly, or DVD playing back, VCD or the like, or even be in idle state, these the time all be to be in the lighter state of load for computer system 10, be called underloading (light load), otherwise then be called heavy duty (heavy load).See also Fig. 2 and Fig. 3, when Fig. 2 shows conventional computer system 10 and is in heavy condition, the change in voltage figure of processor 12, when Fig. 3 shows conventional computer system 10 and is in light condition, the change in voltage figure of processor 12.Though Fig. 2 and shown in Figure 3 be the change in voltage of processor 12, but other electronic package changes the change in voltage that all is similar to very much processor 12 in fact in the voltage output of heavy duty when the underloading.In general, the operating voltage of processor 12 is not a fixed value, is to be operated in the scope of 3.3 volts (V)+/-10% on the contrary.In other words, as long as its operating voltage is not less than about 3V, can both keep its normal running when processor 12 or other electronic component.Can find that by Fig. 2 processor 12 change in voltage when heavy duty is bigger, almost reach the minium operation voltage of 3.0V, otherwise the change in voltage of processor 12 when underloading is very little, almost only about normal voltage 3.3V.Please later consult Fig. 1 again, aforementioned mentioning, battery 16 export a setting voltage Vset=Vin*R2/ (R1+R2) via partial pressure unit 18 dividing potential drops, and the size of setting voltage Vset will influence the size of output voltage V out after providing galvanic current to press Vin.But concerning conventional computer system 10, no matter be in underloading or heavy duty, setting voltage always is keeps fixed value, and the related output voltage V out that makes also maintains certain value.In order to take the normal operation of computer system 10 when the heavy duty into account, just must be fixed on bigger magnitude of voltage to setting voltage, to obtain bigger output voltage V out (being Fig. 2 and 3.3V shown in Figure 3), this do not have a flexible configuration, computer system 10 still can be operated when heavy duty, but also make computer system 10 under the little light condition of change in voltage, bigger output voltage V out still is provided and causes the waste of battery output power for no reason.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of duty of judging computer system and give the power control system of computer system, to address the above problem with decision output different operating voltage.
The invention provides a kind of power control system that is used for computer system, it comprises that a decision logic circuit, a dividing potential drop control module and a power supply provide circuit.The decision logic circuit is used for the state of detection computations machine system and judges voltage to export one; The dividing potential drop control module is used for exporting a setting voltage according to the judgement voltage that the decision logic circuit is exported, and power supply provides circuit to be used for producing an output voltage to computer system according to setting voltage.The dividing potential drop control module comprises that then one is electrically connected on first resistance, one second resistance and an on-off circuit of a voltage source.Second resistance system is connected in first resistance in the mode of series connection; On-off circuit is connected in first resistance in parallel, and is connected in the decision logic circuit, and on-off circuit can open or cut out so that dividing potential drop control module output setting voltage according to the judgement voltage that the decision logic circuit is exported.
The invention has the advantages that the judgement voltage of the visual decision logic circuit of dividing potential drop control module differentiates the duty of computer system, and provide circuit that different output voltages is provided suitably to control this power supply according to the duty of computer system, reducing the power dissipation of computer system when the underloading, and increase the battery powered time.
Description of drawings
Fig. 1 shows the functional block diagram of conventional computer system;
When Fig. 2 shows conventional computer system and is in heavy condition, the change in voltage figure of processor;
When Fig. 3 shows computer system shown in Figure 1 and is in light condition, the change in voltage figure of processor;
Fig. 4 shows the functional block diagram of the computer system of the first embodiment of the present invention;
Fig. 5 shows the graph of a relation of the detection signal that Fig. 4 South Bridge chip exported when computer system is in heavy duty;
Fig. 6 shows the graph of a relation of the detection signal that Fig. 4 South Bridge chip exported when computer system is in underloading;
Fig. 7 shows Fig. 4 computer system respectively at underloading and when heavy duty, the comparison diagram of changing voltage and reference voltage;
Fig. 8 shows the functional block diagram of the computer system of the second embodiment of the present invention;
Fig. 9 shows the functional block diagram of the computer system of the third embodiment of the present invention.
Embodiment
See also Fig. 4, Fig. 4 shows the functional block diagram of the computer system 30 of the first embodiment of the present invention.Computer system 30 comprises a processor 32, a battery 36 and a power control system 20.Power control system 20 comprises that a power supply provides circuit 34, a dividing potential drop control module 38 and a decision logic circuit 40.Processor 32 is used to control the running of whole computer system 30, required DC voltage when battery 36 is used to provide computer system 30 runnings, and decision logic circuit 40 is used for the state of detection computations machine system 30 and judges voltage to export one.Dividing potential drop control module 38 is used for exporting a setting voltage according to the judgement voltage that decision logic circuit 40 is exported, and power supply provide circuit 34 be used for according to setting voltage produce an output voltage to the electronic package of computer system 30 (because the power consumption of processor 32 accounts for computer system 30 most power consumption, be simplified illustration, in the present embodiment, with the representative of processor 32) as electronic package.
40 in decision logic circuit comprises a South Bridge chip 48, a comparer 44 and a voltage conversion unit 46.See also Fig. 5 and Fig. 6, Fig. 5 shows the graph of a relation of the detection signal that South Bridge chip 48 is exported when computer system 30 is in heavy duty, the graph of a relation of the detection signal that Fig. 6 is exported when then being in underloading for South Bridge chip 48.Comparison diagram 5 and Fig. 6 can find, the difference between the detection signal that South Bridge chip 48 is exported when detection signal that node A is exported and heavy duty when underloading.See through voltage conversion unit 46 detection signal of node A is converted to the detection voltage of a direct current, the RC wave filter realization that such voltage conversion unit 46 can be made up of resistance and an electric capacity.The direct current detection voltage back and another reference voltage that is connected to comparer 44 that produce are made comparisons.See also Fig. 7, Fig. 7 be computer system 30 respectively in underloading and when heavy duty, the changing voltage of exporting in Node B through voltage conversion unit 46 and the comparison diagram of reference voltage.Can find from Fig. 7, if when choosing suitable reference voltage Vref, comparer 44 can be when heavy duty the judgement voltage of output logic " 1 ", otherwise, when underloading, can output logic " 0 " judgement voltage
Consult Fig. 4 again, dividing potential drop control module 38 comprises one first resistance R 1, one second resistance R 2, one the 3rd resistance R 3 and an on-off circuit 42.On-off circuit 42 can be a nmos pass transistor.As shown in Figure 4, the drain electrode of nmos pass transistor 42 and first resistance R 1 and the 3rd resistance R 3 are electrically connected on node C, the source electrode of nmos pass transistor 42 then is electrically connected on node E with first resistance R 1 and second resistance R 2, and the grid of nmos pass transistor 42 then is electrically connected on comparer 44 to receive the judgement voltage that comparer 44 transmits.When the judgement voltage of being exported when comparer 44 is logical one, when expression decision logic circuit 40 detects computer system 30 and is in " heavy duty ", nmos pass transistor 42 conductings, this moment, the effect of first resistance R 1 can be ignored, and setting voltage Vset=Vin*R2/ (R2+R3); Otherwise when the judgement voltage of being exported when comparer 44 was logical zero, when expression decision logic circuit 40 detected computer system 30 and is in " underloading ", nmos pass transistor 42 was closed, this moment setting voltage Vset=Vin*R2/ (R1+R2+R3).Clearly, setting voltage Vset is then bigger when less and heavily loaded when underloading, and different setting voltage Vset see through again power supply provide circuit 34 with the output voltages that produce different sizes to computer system 30.Through above controlling mechanism, the deviser can suitably control the value of first resistance R 1, makes under the prerequisite of the output voltage V out when not influencing heavy duty the output voltage V out when reducing underloading.For instance, after choosing the first suitable resistance R 1, setting voltage Vset=Vin*R2/ (R2+R3) in the time of just can controlling heavy duty provides the output voltage V out of the tight 3.3V of giving birth to of circuit 34 via power supply, and the setting voltage Vset=Vin*R2/ (R1+R2+R3) during underloading provides the output voltage V out that can produce 3.0V behind the circuit 34 via power supply.Thus, the operating voltage 3.0V when power control system 20 can be reduced in underloading, and no longer be the 3.3V that fixes, so computer system 30 just can be saved the power consumption when underloading, and then make become more efficient the discharge time of battery 36.
See also Fig. 8, Fig. 8 shows the functional block diagram of the computer system 50 of the second embodiment of the present invention.For brief description, under the situation that does not hinder the technology of the present invention to disclose, identical functions square among label, title and Fig. 4 has identical functions among Fig. 8.Power control system 70 in the computer system 50 of Fig. 8 is that with power control system 20 differences of the computer system 30 of Fig. 4 the on-off circuit 54 of dividing potential drop control module 52 is the PMOS transistor, rather than nmos pass transistor.If during the judgement voltage logical zero that decision logic circuit 40 is exported, on-off circuit 54 conductings, so setting voltage Vset=Vin*R2/ (R2+R3), if if decision logic circuit 40 exported judgement voltage logical one the time, on-off circuit 54 cuts out, so setting voltage Vset=Vin*R2/ (R1+R2+R3).Thus, as long as control allows the judgement voltage of decision logic circuit 40 output logic " 1 " when underloading, the judgement voltage of output logic " 0 " during heavy duty, the power consumption that just can allow computer system 50 save when underloading, and then make become more efficient the discharge time of battery 36.
The computer system 30 of Fig. 4 also is to omit with the 3rd resistance R 3 of the computer system 50 of Fig. 8 in fact.See also Fig. 9, Fig. 9 shows the calcspar of the computer system 60 of the third embodiment of the present invention.In order to simplify explanation, under the situation that does not hinder the technology of the present invention to disclose, identical functions square among label, title and Fig. 4 has identical functions among Fig. 9.The power control system 80 of computer system 60 is with power control system 20 differences of the computer system 30 of Fig. 4, power control system 80 is taken away the 3rd resistance R 3 of the computer system 30 of Fig. 4, that is node C is connected directly to battery 36, so the dividing potential drop control module 62 of Fig. 9 comprises one first resistance R 1, one second resistance R 2 and an on-off circuit 42.And on-off circuit 42 can be a nmos pass transistor or a PMOS transistor, adopts nmos pass transistor in the present embodiment.When heavy duty, the nmos pass transistor 42 of conducting allows setting voltage Vset=Vin*R2/R2=Vin, and during underloading, the nmos pass transistor 42 of closing allows setting voltage Vset=Vin*R2/ (R1+R2), at this moment, as long as change the related setting that power supply provides circuit 34, also can be so that output voltage V out can change the different magnitude of voltage of output with different setting voltage Vset.
Please note, decision logic circuit of the present invention also can see through current sensor (current reader), or one program code or other can be used for judging the underloading of computer system or the device of heavy duty, judge voltage with load condition output according to computer system.
Compared to prior art, the power control system of computer system of the present invention can be given computer system with decision output different operating voltage according to the duty of judging computer system, in other words, when computer system is in underloading, the exportable lower operating voltage of power control system, because the permission operating voltage range of each electronic package of computer system is approximately 3.3 volts (V)+/-10%, and the change in voltage of underloading computer-chronograph system is little, so computer system can use lower operating voltage still can keep normal operation under the situation of underloading, and then the power attenuation when saving underloading, and be increased the battery powered time.And the component architecture that the present invention will increase is also uncomplicated, does not need to bear too many extra cost.
The above only is preferred embodiment of the present invention, and all equal variation and modifications of being done according to claim scope of the present invention all should belong to the covering scope of patent of the present invention.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03127533 CN1276327C (en) | 2003-08-06 | 2003-08-06 | A power control system that provides different outputs according to the working status of the computer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03127533 CN1276327C (en) | 2003-08-06 | 2003-08-06 | A power control system that provides different outputs according to the working status of the computer system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1581020A CN1581020A (en) | 2005-02-16 |
| CN1276327C true CN1276327C (en) | 2006-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03127533 Expired - Lifetime CN1276327C (en) | 2003-08-06 | 2003-08-06 | A power control system that provides different outputs according to the working status of the computer system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409143C (en) * | 2005-07-04 | 2008-08-06 | 宏碁股份有限公司 | judging circuit of power converter |
| CN100553063C (en) * | 2006-06-30 | 2009-10-21 | 纬创资通股份有限公司 | Power switch circuit capable of avoiding overlarge load of bus interface and related driving method |
| CN107945755B (en) * | 2017-11-21 | 2020-10-09 | 深圳市华星光电技术有限公司 | Pulse width modulation integrated circuit and display device |
| CN111224657A (en) * | 2019-12-25 | 2020-06-02 | 曙光信息产业(北京)有限公司 | Power supply switching circuit of computer USB port |
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