CN1933318A - Fan control system - Google Patents
Fan control system Download PDFInfo
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- CN1933318A CN1933318A CNA2005101034580A CN200510103458A CN1933318A CN 1933318 A CN1933318 A CN 1933318A CN A2005101034580 A CNA2005101034580 A CN A2005101034580A CN 200510103458 A CN200510103458 A CN 200510103458A CN 1933318 A CN1933318 A CN 1933318A
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Abstract
This invention relates to a fan control system used in an electronic system set with multiple fans including a signal generating module, an inverse module and a delay module, in which, said fan control system generates PWM signal delaying a time interval mutually to control the multiple fans of said electronic system and avoid sudden increasing of the peak value of the sum supply signals when the fans are operating and instant over too low of the supply signal provided to the electronic system. This invention can avoid the influence to the working supply of the system by surge current generated by the PWM fans to guarantee that the system can work normally.
Description
Technical field
The invention relates to a kind of voltage stabilizing technique, particularly about a kind of can be during by low uprising at pwm signal, the surge current (Surge current) that each fan is produced postpones to be distributed in different time points the fan control system of avoiding voltage to descend takes place.
Background technology
Flourish along with electronic industry, electronic product also progresses into multi-functional, high performance R﹠D direction.For satisfying the package requirements of electronic product microminiaturization, the heat that produces when electronic component moves on the circuit board of electronic product obviously increases, fan demand is quantitatively also constantly increased, for example existing 1U or 2U system all dispose 6 to 8 even 12 fans, and general at present fan control technology commonly used is with a pulse width modulation (Pulse WidthModulation; PWM) signal offers these fans and shares.As shown in Figure 1, existing fan control technology be the pwm signal that produces by signal generator module 10 simultaneously to a plurality of fans, for example the running of fan 11, fan 12 is controlled.
Please in the lump with reference to figure 2 and Fig. 3, when the pwm signal 100 of signal generator module 10 generations jumps to high potential " 1 " by electronegative potential " 0 ", power supply (voltage or the electric current) signal that produces on fan 11 and the fan 12 is respectively 301,302, because the loading of these fans, can cause being applied to the peak value moment sharp increase (as shown in Figure 2) of general supply signal 300 on these fans, and then make the power supply signal 200 that offers electronic system this moment because of all influences of loading of these fans, produce a low excessively power supply peak value 200a, and this low excessively power supply peak value 200a can't provide enough working powers for electronic system, therefore cause the electronic system can't operate as normal, also simultaneously the stability of electronic system is impacted.
Therefore, how to develop a kind of fan control system that can solve the various shortcomings of above-mentioned prior art, real technical task for needing to be resolved hurrily at present.
Summary of the invention
For overcoming the shortcoming of above-mentioned prior art, main purpose of the present invention is to provide a kind of fan control system, be applied in the electronic system, avoid surge current that the PWM fan produces that the working power of electronic system is impacted, guarantee that electronic system can operate as normal.
Another object of the present invention is to provide a kind of fan control system, can be during by low uprising at pwm signal, the surge current (Surge current) that each fan is produced postpones to be distributed in different time points to be taken place, and avoids voltage to descend.
For reaching above-mentioned and other purpose, the present invention promptly provides a kind of fan control system, being applied in group is provided with in the electronic system of a plurality of fans (as first fan, second fan, three fan, the 4th fan), this fan control system comprises: signal generator module, at least comprise first signal generator module and secondary signal generation module, the control command of sending according to this electronic system, produce pulse width modulating signal and output to the fan that this electronic system group is established, by the operation of this pulse width modulating signal control fan; Anti-phase module, be second pulse width modulating signal that this secondary signal generation module is exported is carried out anti-phase to produce inversion signal, and anti-phase back signal offered second fan that this electronic system group is established, control the operation of this second fan by this inversion signal; And at least one Postponement module, be that first pulse width modulating signal of first signal generator module output and the inversion signal of this anti-phase module generation are postponed to handle, to produce first inhibit signal and second inhibit signal, and this first inhibit signal and second inhibit signal outputed to three fan and the 4th fan that this electronic system group is established respectively, control the operation of this three fan and the 4th fan respectively by this first inhibit signal and second inhibit signal.
On reality was used, the quantity of signal generator module was half of number of fans, and just one group of fan (quantity is 2) is the pulse width modulating signal control running of being exported by its pairing signal generator module;
Above-mentioned this first signal generator module and secondary signal generation module are the pulse-modulated signal generator, the control command of sending according to this electronic system, produce first pwm signal and second pwm signal, the duty ratio sum of this first pwm signal and second pwm signal is 1.
This anti-phase module is an inverter or negative circuit, and this Postponement module is a delay device or delay circuit.In addition, this electronic system is computer system or server system.
This fan control system mainly is that to provide the duty ratio sum by first signal generator module and secondary signal generation module be 1 first pwm signal and second pwm signal, by this first pwm signal and second pwm signal after anti-phase, the directly operation of control first fan and second fan postpones first pwm signal in a time interval and the operation that the second anti-phase pwm signal is controlled this three fan and the 4th fan respectively by Postponement module simultaneously.Therefore, the pwm signal of a plurality of fans that this electronic system group of fan control system may command of the present invention is established, produce certain hour delay at interval each other, and then the pwm signal of avoiding all control fans is when being high potential by the electronegative potential saltus step, peak value moment of the totalling power supply signal that produces on these fans increases severely, and causes power supply moment of electronic system lowly excessively to cause the situation that electronic system can't operate as normal to take place.
Among the present invention when the fan of this electronic system increases, only need in this fan control system, to increase Postponement module with different delay factors, can with first pwm signal and anti-phase after second pwm signal postpone output, fan running to follow-up increase is controlled, and also can therefore significantly improve the elasticity of circuit design.
In sum, fan control system of the present invention, be applied in and avoid surge current that the PWM fan produces that the working power of electronic system is impacted in the electronic system, guarantee that electronic system can operate as normal, fan control system of the present invention is at pwm signal during by low uprising, the surge current that each fan is produced postpones to be distributed in different time point generations, avoids voltage to descend.
Description of drawings
Fig. 1 is the structural representation of existing fan control system;
Fig. 2 produces the waveform schematic diagram of signal and the totalling power supply signal waveform schematic diagram of whole fans on signal generator module shown in Figure 1 and the fan;
Fig. 3 is signal 100,300 shown in Figure 2 and the waveform schematic diagram that offers the power supply signal 200 of electronic system;
Fig. 4 is the basic structure schematic diagram of fan control system of the present invention;
Fig. 5 and Fig. 6 are pulse width modulating signal S1, the S2 of fan control system generation of the present invention, the waveform schematic diagram of S3; And
Fig. 7 is pulse width modulating signal S1, S3, S5, the S6 that fan control system of the present invention produces, the waveform schematic diagram of fan power supply signal 101,102,103,104 and totalling power supply signal 110.
Embodiment
Embodiment
Fig. 4 illustrates the basic structure schematic diagram of fan control system of the present invention.As shown in the figure, fan control system 4 of the present invention is to be applied in the electronic system 5 (for example computer system or server system), 5 groups of a plurality of fans of establishing of control electronic system move, in following examples, electronic system is provided with fan 51, fan 52, fan 53 and fan 54 (do not exceed with this quantity, also being available for users to increases by actual demand) for 5 groups, wherein, fan 51 and fan 52 are first group of fans, and second group of fan comprises fan 53 and fan 54.What this need specify be, in the present embodiment only example the assembly relevant with the present invention is shown, but be not to limit range of application of the present invention with this.
As shown in Figure 4, fan control system 4 comprises first signal generator module 40, secondary signal generation module 41, anti-phase module 42 and Postponement module 43.Below promptly cooperate Fig. 5 that fan control system 4 set first signal generator module 40, secondary signal generation module 41, anti-phase module 42 and Postponement modules 43 are elaborated.
First signal generator module 40 is to produce one first pulse width modulation (Pulse Width Modulation according to the control command that electronic system 5 is sent; PWM) signal S1 outputs to the fan 51 that first group of fan comprises, by the operation of first pwm signal S1 control fan 51.Just first signal generator module 40 is pwm signal generators (generator), can be according to the control command of electronic system 5, and producing a duty ratio is the rotating speed of PWM power supply (voltage or electric current) the signal controlling fan 51 of A.Utilizing the technology of pulse width modulating signal control fan operation is prior art, and for industry is extensive use of, so no longer give unnecessary details for literary composition at this.
This secondary signal generation module 41 is the control commands according to electronic system 5, produce one second pulse width modulating signal S2, just secondary signal generation module 41 is that to produce duty ratio according to the control command of electronic system 5 be the 2nd PWM power supply signal of B, and the duty ratio of the first pwm signal S1 and the second pwm signal S2 concerns and satisfies following equation
A+B＝1 (1)
Duty ratio has determined the rotating speed of fan, and the big more then rotation speed of the fan of duty ratio is big more.
This anti-phase module 42 is used to receive the second pulse width modulating signal S2, and this second pulse width modulating signal S2 is carried out anti-phase processing, produces inversion signal and outputs to the fan 52 that this first group of fan comprises, by the operation of this inversion signal control fan 52.Just anti-phase module 42 is inverters, and the second pulse width modulating signal S2 that it exports secondary signal generation module 41 carries out anti-phase, and the second anti-phase pulse width modulating signal is outputed to fan 52, the rotating speed of control fan 52.As shown in Figure 5, when the duty ratio A of the first pulse width modulating signal S1 is 90%, by above-mentioned equation (1) as can be known the duty ratio B of the second pulse width modulating signal S2 be 10%, this second pulse width modulating signal S2 obtains duty ratio after anti-phase through anti-phase module 42 also be 90% pulse width modulating signal S3, but pulse width modulating signal S3 compares with the first pulse width modulation signal S1 and postpones a time interval Δ T1 (being equivalent to postpone 1/10 period of time T), when just the first pulse-modulated signal S1 jumped to high potential " 1 " by electronegative potential " 0 ", pulse width modulating signal S3 then became electronegative potential " 0 " by high potential " 1 ".As shown in Figure 6, when the first pulse width modulating signal S1 duty ratio A is 50%, by above-mentioned equation (1) as can be known, the duty ratio B of the second pulse width modulating signal S2 is 50%, after the anti-phase module 42 of process is carried out anti-phase processing, the pulse width modulation signal S3 duty ratio that obtains also is 50%, but pulse width modulation signal S3 compares delay one time interval Δ T1 with the first pulse width modulation signal S1, promptly be equivalent to postpone 1/2 period of time T.From the above mentioned as can be known, when the duty ratio A of the first pulse width modulating signal S1 changes in 0 to 100% scope, by above-mentioned equation (1) as can be known the duty ratio of the second pulse width modulating signal S2 in 100% to 0 scope, change, after anti-phase module 42 is anti-phase, also can obtain identical pulse width modulating signal S3 again, control the set fan 51 of first group of fan and the rotating speed of fan 52 respectively by the first pulse width modulation signal S1 of this time delay Δ T1 that is had each other and pulse width modulation signal S3 with the first pulse width modulating signal S1 duty ratio A.
This Postponement module 43 is after the first pulse width modulating signal S1 that first signal generator module 40 is exported is postponed a preset time interval delta T 2 (for example postponing 1/10 period of time T), export one first inhibit signal to second group of fan 53 that fan is included, move by this first inhibit signal control fan 53, and after the inversion signal S5 of anti-phase module 42 outputs can being postponed the time interval Δ T2 of this reservation, export one second inhibit signal to fan 54, move by this second inhibit signal control fan 54.Just Postponement module 42 is device or the delay circuits with delay feature, it is with the first pulse width modulating signal S1 and this inversion signal, be after above-mentioned pulse width modulating signal S3 postpones a time interval Δ T2, output pulse width modulation power source (voltage or electric current) signal S5 and S6 make this pulse width modulation power supply signal S5 and S6 control included fan 53 of this second group of fan and 54 rotating speed respectively.
In addition, in other execution mode of the present invention, 5 groups of fans of establishing of electronic system may be more than 4, for example be 6 or 8 fans, and these fans are to form a fan group in twos, control the wherein operation of one group of fan respectively by the pwm signal that first signal generator module of the present invention and secondary signal generation module produce, need to increase the number of Postponement module 43 simultaneously, pwm signal with this first signal generator module and the generation of secondary signal generation module postpones a plurality of time intervals respectively to postpone output, so as to controlling the operation of all the other fan groups respectively.
For further highlighting advantage of the present invention and effect, now the present invention is further described in detail.As shown in Figure 7, for example, as first pulse width modulation (the Pulse Width Modulation of above-mentioned first signal generator module 40 generations; PWM) the pulse width modulating signal S5 behind the delayed module 43 delay Δ T2 of signal S1, the second pulse width modulating signal S2 that secondary signal generation module 41 produces controls fan 51 respectively through anti-phase module 42 anti-phase pulse width modulating signal S3 and the pulse width modulating signal S6 of pulse width modulation signal S3 after this Postponement module 43 postpones Δ T2, fan 52, fan 53, two groups of fans such as fan 54 grades, and obtain respectively as shown in Figure 7 with fan 51, fan 52, fan 53, power supply (voltage or the electric current) signal 101 that fan 54 is corresponding respectively, 102,103 and 104, from the above, because of these pulse width modulating signals S1, S3, S5, S6 has the regular hour delay each other, make fan 51, fan 52, fan 53, the peak value of the power supply signal that produces on the fan 54 staggers each other, and then make the amplitude that is applied to the totalling power supply signal 110 on these fans can acutely not increase moment, diminish so can avoid offering power supply moment of electronic system 5, can not cause the electronic system can't be normal, stable work.
In sum, this fan control system mainly is that to provide the duty ratio sum by first signal generator module and secondary signal generation module be 1 first pwm signal and second pwm signal, by this first pwm signal and second pwm signal after anti-phase directly in first group of fan of control each contained fan move, can postpone first pwm signal in a time interval and the second anti-phase pwm signal via Postponement module simultaneously and control each contained in second group of fan fan respectively and move.Therefore, the pwm signal of a plurality of fans that establish of this electronic system group of control can be produced certain hour delay at interval each other by fan control system of the present invention, when avoiding all pwm signals of controlling fans to be high potential by the electronegative potential jumping, the peak value moment sharp increase of the totalling power supply signal that produces on these fans, cause power supply moment of electronic system low excessively, cause electronic system can't be normally, the thing of steady operation takes place.
In addition, in the present invention, when the fan of this electronic system increases, only need in this fan control system, to set up Postponement module with different delay factors, can with first pwm signal and anti-phase after second pwm signal postpone output, fan to follow-up increase is controlled, and then can improve the elasticity of circuit design.
Claims (6)
1. a fan control system is applied in group and establishes in the electronic system of a plurality of fans, it is characterized in that this fan control system comprises:
Signal generator module, at least comprise first signal generator module and secondary signal generation module, according to the control command that this electronic system is sent, produce pulse width modulating signal and output to the fan that this electronic system group is established, by the operation of this pulse width modulating signal control fan;
Anti-phase module, be second pulse width modulating signal that this secondary signal generation module is exported is carried out anti-phase to produce inversion signal, and anti-phase back signal offered second fan that this electronic system group is established, control the operation of this second fan by this inversion signal; And
At least one Postponement module, be that first pulse width modulating signal of first signal generator module output and the inversion signal of this anti-phase module generation are postponed to handle, to produce first inhibit signal and second inhibit signal, and this first inhibit signal and second inhibit signal outputed to three fan and the 4th fan that this electronic system group is established respectively, control the operation of this three fan and the 4th fan respectively by this first inhibit signal and second inhibit signal.
2. fan control system as claimed in claim 1 is characterized in that, the duty ratio sum of this first pulse width modulating signal and this second pulse width modulating signal is 1.
3. fan control system as claimed in claim 1 is characterized in that, this anti-phase module is inverter or negative circuit.
4. fan control system as claimed in claim 1 is characterized in that, this Postponement module is delay circuit or delay device.
5. fan control system as claimed in claim 1 is characterized in that, this first signal generator module and secondary signal generation module are the pulse width modulating signal generators.
6. fan control system as claimed in claim 1 is characterized in that, this electronic system is computer system or server system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101034580A CN100456620C (en) | 2005-09-15 | 2005-09-15 | Fan control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101034580A CN100456620C (en) | 2005-09-15 | 2005-09-15 | Fan control system |
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| Publication Number | Publication Date |
|---|---|
| CN1933318A true CN1933318A (en) | 2007-03-21 |
| CN100456620C CN100456620C (en) | 2009-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101034580A Expired - Fee Related CN100456620C (en) | 2005-09-15 | 2005-09-15 | Fan control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI482422B (en) * | 2012-11-05 | 2015-04-21 | Inventec Corp | Fan control system and fan control method |
| CN112454700A (en) * | 2020-09-30 | 2021-03-09 | 青岛高测科技股份有限公司 | Multi-slicer system and control method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06165519A (en) * | 1992-11-27 | 1994-06-10 | Sanyo Electric Co Ltd | Method for driving electric motor |
| US6725132B2 (en) * | 2002-06-20 | 2004-04-20 | Minebea Co., Ltd. | Intelligent cooling fan |
| US6876164B2 (en) * | 2003-07-07 | 2005-04-05 | Zippy Technology Corp. | Complementary fan rotational speed control method and apparatus |
-
2005
- 2005-09-15 CN CNB2005101034580A patent/CN100456620C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI482422B (en) * | 2012-11-05 | 2015-04-21 | Inventec Corp | Fan control system and fan control method |
| CN112454700A (en) * | 2020-09-30 | 2021-03-09 | 青岛高测科技股份有限公司 | Multi-slicer system and control method |
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| CN100456620C (en) | 2009-01-28 |
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Granted publication date: 20090128 Termination date: 20110915 |