CN101230864A - Fan control system - Google Patents
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- CN101230864A CN101230864A CNA2007100043149A CN200710004314A CN101230864A CN 101230864 A CN101230864 A CN 101230864A CN A2007100043149 A CNA2007100043149 A CN A2007100043149A CN 200710004314 A CN200710004314 A CN 200710004314A CN 101230864 A CN101230864 A CN 101230864A
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Abstract
The invention relates to a fan control system, which is used for detecting temperature and power of at least a work component to control the rotating speed of at least a fan used for cooling the work component. The fan control system comprises at least a work component temperature detecting unit and a work component power detecting unit to detect the temperature and the power of the work component to respectively obtain the temperature of the work component and the power of the work component. The fan control system also comprises a fan control circuit, and the fan control circuit resets lower limit reference temperature, upper limit reference temperature and reference power in advance, wherein, the upper limit reference temperature is higher than the lower limit reference temperature. After being compared with the temperature of the work component and the power of the work component, the invention outputs a control signal to control the rotating speed of the fan. When the fan control system of the invention is adopted, the effects of stabilizing rotate speed of the fan and reducing instant activation noise and protecting the work component can be received.
Description
Technical field
The invention relates to a kind of fan control system, be meant a kind of temperature of detection operations assembly and power especially and control the fan control system of rotation speed of the fan.
Background technique
In general electronic equipment or production system, have and must effectively control device, system or ambient temperature many time, can guarantee that just device or system operate under dynamical environment.For the operational temperature of these electronic equipments (as computer) or production system (as ventilation type quenching processing system) is effectively controlled, except heating and constant temperature feedback system, cooling system is also being played the part of considerable role.In these cooling systems, the type of cooling that is adopted is mostly nothing more than modes such as ventilation type, liquid cooling or solid state heat conduction.Wherein, again because air-cooled operating cost is comparatively cheap usually, so widely popular the employing.
Under this prerequisite, to look about in the most ventilation type cooling system, fan is in the common cooling package the most representative one.In known technology, fan can be controlled in a different manner and in addition because of the difference of its cooling object usually, and its control mode has three kinds of control modes usually: the first is set fixing rotating speed and controlled; It two is the mode of utilizing detecting temperature to be controlled; Its three modes for utilizing probe power to be controlled.
For first kind of mode, be typically provided with several sections wind speed and select for the user and switch, unless the user is controlled in the mode of manual switchover, otherwise can't adjust rotating speed in response to environment automatically at all.Under this situation, in order to reduce the number of times of operation of user's manual switchover, and, all fan can be set in higher fixed rotating speed under usually and turn round the considering of device or system's control safety coefficient, thereby be easy to generate bigger noise, and can consume more power for operation.
For the second way, will enumerate an example below and be illustrated.See also Fig. 1, it is the functional block diagram that shows work package, fan control system and fan in the known technology.As shown in the figure, a fan control system 1 is in order to survey the temperature of a work package 2, to control the rotating speed of a fan 3 that is used to cool off this work package 2.This fan control system 1 includes a work package temperature probe unit 11, a processing unit 12 and a fan control circuitry 13.Wherein, work package temperature probe unit 11 is in order to survey the temperature of these work package 2 select locations, send out a work package temperature signal S1 and handle computing to processing unit 12, through after the processing computing of processing unit 12, can send out a control signal S2 to fan control circuitry 13, thereby the rotating speed of fan 3 not had the control of segmentation or segmentation running.
Such as have in the fan control system association area and know that usually the knowledgeable all can understand, in above-mentioned known technology, when the temperature of being surveyed was lower than particular value, fan then can not rotate, to reduce the consumption of electric power.Yet if work package 2 is in the high capacity serviceability for a long time, at end operation or transfer low-power when running to, its temperature is still high, fan 3 still can be run up and produces noise.When the operating temperature of being surveyed during in default critical reference value, fan 3 may be walked around and be stopped, or constantly activates.Aspect the temperature detection, if fan 3 do not change, work package temperature probe unit 11 only depends on and contacts conduction pattern with work package 2 and survey, and making on the temperature of real heating element has gap.In addition, for the work package 2 that can generate heat during with running, the requirement of safety standard aspect is arranged all for work package temperature probe unit 11.In the practice utilization, in order to meet the requirement of safety standard, can sacrifice the conducting power of part usually, the feasible distortion as a result of surveying gained.
For the third mode, below other is lifted an example and be illustrated.See also Fig. 2, it is the functional block diagram that shows work package, fan control system and fan in another known technology.As shown in the figure, a fan control system 1a is in order to survey the power of a work package 2a, to control the rotating speed of a fan 3a who is used to cool off this work package 2a.This fan control system 1a includes a work package power probe unit 11a, a processing unit 12a and a fan control circuitry 13a.Wherein, work package power probe unit 11a is in order to survey the running power of this work package 2a, send out a work package power signal S1 ' according to this and handle computing to processing unit 12a, after the processing computing through processing unit 12a, can send out a control signal S3 to fan control circuitry 13, thereby the rotating speed of fan 3 not had the control of segmentation or segmentation running.
Such as have in the fan control system association area and know that usually the knowledgeable all can understand, in above-mentioned known technology, when work package 2a decommissioned, fan 3a also decommissioned thereupon; When work package 2a operated under low-power, fan 3a may not can rotate.In addition, when work package 2a comes into operation with higher activation power, or activate power at height and carry out the operation of short time, still can generation make us feeling uncomfortable noise.After work package 2a uses through long high capacity, in case change low-power operation suddenly into, then also rapid drawdown thereupon of the rotating speed of fan, but work package 2a still can continue heating, and the high heat that is produced when making the previous high capacity running of work package more is difficult for loss to extraneous.So, the temperature that probably causes work package is higher than default protection desired temperature, and therefore causes the damage of work package.
Summary of the invention
Technical problem and purpose that institute of the present invention desire solves:
Comprehensive the above, three kinds of processing modes commonly used in known technology have many shortcomings respectively.Wherein, in the method for being controlled setting fixing rotating speed, in order to reduce the number of times of operation of user's manual switchover, and considering to device or system's control safety coefficient, usually all fan can be set in running under the higher fixed rotating speed, thereby be easy to generate bigger noise, and can consume more power for operation.
In the mode of utilizing detecting temperature to be controlled, when the operating temperature of being surveyed during in default critical reference value, fan may be walked around and be stopped, or constantly activates; And, cause the distortion as a result of surveying gained easily in order to meet the requirement of safety standard.
In the mode of utilizing probe power to be controlled, in case work package decommissions, fan will and then decommission and can't continue to provide the effect of cooling.When work package comes into operation with higher activation power, or activate power at height and carry out the operation of short time, still can generation make us feeling uncomfortable noise.Simultaneously, under the situation of long-time high capacity, when changing into low load condition suddenly, the temperature that causes work package easily is higher than default protection desired temperature, and therefore causes the damage of work package.
Therefore, main purpose of the present invention provides a kind of fan control system, this system has work package temperature probe unit and work package power probe unit, detect the temperature and the power of work package respectively, and produce control signal and control the rotating speed of fan and address the above problem simultaneously.
The technological means that the present invention deals with problems:
The present invention provides a kind of fan control system for the technological means that problem adopted that solves known technology, and it is in order to the temperature of detection operations assembly and power, controls the rotating speed of at least one fan that is used to cool off this work package.This fan control system includes at least one work package temperature probe unit, and the temperature of surveying this work package is to obtain the work package temperature.This fan control system also includes at least one work package power probe unit, and the power of surveying this work package is to obtain work package power.This fan control system also includes a fan control circuitry, and this fan control circuitry is preset with a upper limit reference temperature and a reference power that a lower limit reference temperature, is higher than this lower limit reference temperature, after comparing, export a control signal and control the running speed of said fans with this work package temperature and this work package power.
The present invention contrasts the effect of prior art:
Set the technology of fixing rotating speed compared to known utilization with the control rotation speed of the fan, the present invention can react work package temperature and work package power and adjust this control signal, and effectively control the rotating speed of fan, therefore, can receive the effect of problems such as effective solution high noisy and high power consumption.
Compared to the known technology of utilizing the detection operations assembly temperature with the control rotation speed of the fan, when fan does not change, still can come the rotating speed of auxiliary operation fan by the result of detection of work package power, can effectively reduce the huge deviation that causes because of the result of detection distortion of work package temperature in the control.Simultaneously, about critical value, still can control rotation speed of the fan, make fan be unlikely to walk around and stop by the controlling elements of work package power at the work package detecting temperature.Therefore, can receive the effect that reduces control deviation improperly and stable rotation speed of the fan.
Compared to the known technology of utilizing the detection operations component power with the control rotation speed of the fan, in case work package decommissions, the rotating speed of fan still can be subjected to the work package temperature controlling, and is unlikely to decommission immediately.When work package comes into operation with higher activation power, or when height activation power carries out the operation of short time, because the work package temperature is still not high, controls fan so can cushion the dilution work package factor and be unlikely to running under too high rotating speed and produce high noisy.Simultaneously, under the situation of long-time high capacity, when changing into low load condition suddenly,,, make that work package still can continue to obtain to cool off fully and be unlikely to impaired so rotation speed of the fan can not descend too much immediately because the work package temperature is still higher.Therefore, can receive stable rotation speed of the fan, minimizing moment activation noise and the effect of protecting work package.
Description of drawings
Fig. 1 is the functional block diagram that shows work package, fan control system and fan in the known technology;
Fig. 2 is the functional block diagram that shows work package, fan control system and fan in another known technology;
Fig. 3 is the functional block diagram that shows first embodiment of the invention;
Fig. 4 is the functional block diagram that shows the fan control system of first embodiment of the invention;
Fig. 5 is displayed map 4 pairing circuit diagram; And
Fig. 6 is the fan control system circuit function schematic representation that shows second embodiment of the invention.
Symbol description:
1,1a fan control system
11 work package temperature probe units
11a work package power probe unit
12,12a processing unit
13,13a fan control circuitry
2,2a work package
3,3a fan
4 fan control systems
41 work package temperature probe units
42 work package power probe units
43 fan control circuitrys
431 power signal transmissions circuit
431a current limliting assembly
432 lower limit temperature comparing units
433 upper limiting temperature comparing units
434 reference power comparing units
435 control switchs
436 control gates
437 buffer circuits
438 weight adders
The 439a analog-to-digital conversion circuit
The 439b processing unit
The 439c D/A conversion circuit
5 work packages
6 fans
01 closed circuit position
02 open-circuit position
The G grounding end
S1 work package temperature signal
S1 ' work package power signal
S2, S3 fan control signal
S4 work package temperature signal
S5 work package power signal
The S6 fan control signal
Embodiment
Specific embodiment of the present invention will and attachedly be graphic and be further described by following embodiment.
Because fan control system provided by the present invention can be widely used in various systems with cooling or radiation fan, its combination mode of execution is too numerous to enumerate especially, so give unnecessary details no longer one by one at this, only enumerates two wherein preferable embodiments and is illustrated.
See also Fig. 3, it is the functional block diagram that shows first embodiment of the invention.As shown in the figure, temperature and the power of a fan control system 4 in order to survey a work package 5, control according to this is used to cool off the rotating speed of a fan 6 of this work package 5.This fan control system 4 includes a work package temperature probe unit 41, a work package power probe unit 42 and a fan control circuitry 43.Wherein, work package temperature probe unit 41 is in order to the temperature of at least one select location (as central position or surface location) of detection operations assembly 5, obtaining a work package temperature T (being shown in Fig. 5), and be sent to fan control circuitry 43 by a work package temperature signal S4.Work package power probe unit 42 is in order to surveying the power of this work package, obtaining a work package power P (being shown in Fig. 5), and is sent to fan control circuitry 43 by a work package power signal S5.Fan control circuitry 43 is communicated with work package temperature probe unit 41 and this work package power probe unit 42 respectively, and the work package temperature T that is transmitted according to work package temperature signal S4, and the work package power P that transmitted of work package power signal S5 and export a control signal S6.
Please continue to consult Fig. 4 and Fig. 5.Wherein, Fig. 4 is the functional block diagram that shows the fan control system of first embodiment of the invention, and Fig. 5 is displayed map 4 pairing circuit diagram.As shown in the figure, above-mentioned fan control circuitry 43 includes a power signal transmissions circuit 431, a lower limit temperature comparing unit 432, a upper limiting temperature comparing unit 433, a reference power comparing unit 434, a control switch 435, a control gate 436, a buffer circuit 437 and a weight adder 438.
Wherein, be provided with a current limliting assembly 431a in the power signal transmissions circuit 431, limit the electric current that flows into fan control circuitry 43.Be preset with a lower limit reference temperature T1 and a upper limit reference temperature T2 respectively in lower limit temperature comparing unit 432 and the upper limiting temperature comparing unit 433, for the comparison with it respectively of above-mentioned work package temperature T.Simultaneously, then be preset with a reference power Pref in the reference power comparing unit 434, compare with it for above-mentioned work package power.In the present embodiment, current limliting assembly 431a is meant a current-limiting resistance, and lower limit temperature comparing unit 432, upper limiting temperature comparing unit 433 all are respectively a comparison amplifier with reference power comparing unit 434.
When fan control circuitry 43 came into operation, power signal transmissions circuit 431 can transmit a factor I signal SA who represents one first controlling elements A (being work package power in the present embodiment).Simultaneously, when the work package temperature T is higher than lower limit reference temperature T1, can send a switch controlling signal S7, control switch 435 is switched to open-circuit position 02, and send out factor I signal SA, when the work package temperature T is lower than lower limit reference temperature T1, the switch controlling signal S7 that is sent can switch to closed circuit position 01 with control switch 435, so that factor I signal SA in regular turn via closed circuit position 01 with grounding end G and ground connection, change saying it, that is can not send out factor I signal SA.In the present embodiment, between control switch 435 and weight adder 438, connect buffer circuit 437 especially, come stably factor I signal SA to be sent to weight adder 438.
In addition, after work package temperature T and upper limit reference temperature T2 compare, can produce a factor signal SB who represents one second controlling elements B; After work package power P and reference power Pref compare, can produce a factor III signal SC who represents one the 3rd controlling elements C.Control gate 436 is meant one or door (OR Ga te) in the present embodiment, and it is in order to the transmission of control factor signal SB and factor III signal SC.When the work package temperature T is higher than upper limit reference temperature T2, can send out factor signal SB; When the work package temperature T is lower than this upper limit reference temperature T2, then interrupt transmitting this factor signal SB; When the work package power P is higher than reference power Pref, can send out this factor III signal SC; When the work package power P is lower than reference power Pref, then can interrupt transmitting factor III signal SC.
In the present embodiment, the first controlling elements A corresponding to the first proportioning weights W, 1, the second controlling elements B and the 3rd controlling elements C corresponding to the second proportioning weights W 2.Simultaneously, the first controlling elements A, the second controlling elements B and the 3rd controlling elements C can be in weight adder 438 respectively with first corresponding proportioning weights W 1 and the W2, this control signal S6 is exported in and the product addition that will multiply each other later according to this.
Hold the above, please continue to consult the control signal component relationship table shown in the table one.Shown in this table the five is listed as, " T＜T1 " hurdle demonstration of these row " not (A, W1) ", the demonstration of " T＞T2 " hurdle " not (0, W2) ", the demonstration of " P＞Pref " hurdle " be (C, W2) ", " control signal component relationship " hurdle then shows " AW1+CW2 ".
Table one: control signal component relationship table
| ?T＜T1 | ?T＞T2 | ?P＞Pref | The control signal component relationship |
| Be (0, W1) | Not (0, W2) | Not (0, W2) | ?0 |
| Be (0, W1) | Not (0, W2) | Be (C, W2) | ?CW2 |
| Not (A, W1) | Not (0, W2) | Not (0, W2) | ?AW1 |
| Not (A, W1) | Not (0, W2) | Be (C, W2) | ?AW1+CW2 |
| Not (A, W1) | Be (B, W2) | Not (0, W2) | ?AW1+BW2 |
| Not (A, W1) | Be (B, W2) | Be (C, W2) | ?AW1+BW2+CW2 |
Its meaning representative, the work package temperature T is higher than lower limit reference temperature T1, can export the first controlling elements A, and it is corresponding to the first proportioning weights W 1; The work package temperature T is lower than upper limit reference temperature T2, can not export the second controlling elements B (so being 0), and it is corresponding to the second proportioning weights W 2; The work package power P is higher than reference power Pref, can export the 3rd controlling elements C, and it is corresponding to the second proportioning weights W 2; Every control signal component relationship that adds the General Logistics Department that multiplies each other is AW1+0W2+CW2, that is AW1+BW2, that is this control signal S6 can export according to the component relationship of AW1+BW2.
Then, become the above to enumerate two examples that possess quantized data and verify that the present invention is compared to the effect of above-mentioned fan control system 1 commonly used with 1a.At first, suppose the maximum power output 30Watt of work package, the lower limit reference temperature is T1=50, upper limit reference temperature T2=70, the first proportioning weight=0.5, the second proportioning weight=0.5, reference power Pref=3.5Watt, the critical temperature of fan control system 1 commonly used is 70, work package temperature T=68～72 of being surveyed o'clock, the work package power P=4.0Watt～4.2Watt that is surveyed.
In fan control system 1 commonly used, because the work package temperature surveyed is between 68 and 72, so when temperature was 68～70, then above-mentioned fan 3 just can not turn round, when temperature is 70～72, then above-mentioned fan 3 entry into service again.That is above-mentioned fan 3 will be walked around and be stopped.
Relative, in the fan control system 4 in this example, when temperature is 68～70, meet the shown condition of table one the 5th row, then the control signal component relationship is AW1+CW2, that is 0.5A+0.5C; When temperature is 70～72, meet the shown condition of table one the 7th row, then the control signal component relationship is AW1+BW2+CW2, that is 0.5A+0.5B+0.5C.Therefore, this control signal only can be according to the localized variation of the control signal component relationship of " 0.5A+0.5C " and " 0.5A+0.5B+0.5C ", and the rotating speed of controlling above-mentioned fan 6 is done limited adjustment, the situation that can't walk around and stop.
Secondly, suppose the maximum power output 30Watt of work package again, the lower limit reference temperature is T1=50, upper limit reference temperature T2=70, the first proportioning weight=0.5, the second proportioning weight=0.5, reference power Pref=3.5Watt, the critical power of fan control system 1a commonly used is 3.5Watt, work package temperature T=80～85 of being surveyed o'clock, and the work package power P of being surveyed is reduced to 2.0Watt suddenly from 4.0Watt.
In fan control system 1a commonly used, when the work package power of being surveyed was reduced to 2.0Watt, above-mentioned fan 3a can shut down immediately.Yet, even if having only the work package power of 2.0Watt, still can make above-mentioned merit make assembly 2a and continue heating, but do not have fan and can assist its cooling, add that the work package temperature of originally being surveyed is up to 80～85, the result very likely can make merit make assembly 2a to continue 80～85 or more operate under the condition of high temperature, and thereby to make merit make assembly 2a easier to be impaired.
Relative, in the fan control system 4 in this example, even if work package power has only 2.0Watt, but the work package temperature still has at 80～85 o'clock, meet the shown condition of table one the 6th row, then the control signal component relationship is AW1+BW2, that is 0.5A+0.5B, that is control signal still can continue to control above-mentioned fan 4 according to the control signal component relationship of " 0.5A+0.5B " and remains in operation.
More than, only to enumerate two examples that possess quantized data and verify above two of disclosing in the effect, above disclosed all the other all effects also can be verified according to table one and the above analysis operation method that provides, be given unnecessary details no longer one by one with next.
Please continue to consult Fig. 6, be the fan control system circuit function schematic representation that shows second embodiment of the invention, and it is to calculate control signal in digitized mode.As shown in the figure, not existing together of the present embodiment and first embodiment is to replace above-mentioned fan control circuitry 43 with another fan control circuitry 43a.Simultaneously, not existing together of fan control circuitry 43a and fan control circuitry 43 is power signal transmissions circuit 431, control switch 435, the buffer circuit 437 and weight adder 438 that replaces fan control circuitry 43 with an analog-to-digital conversion circuit 439a, a processing unit 439b and a D/A conversion circuit 439c.Wherein, analog-to-digital conversion circuit 439a is that the work package power T that will be surveyed converts digital form to by analog form.Processing unit 439b is according to the comparative result of work package temperature T and lower limit reference temperature T1 and upper limit reference temperature T2, and the comparative result of work package power P and reference power Pref, and with the digital form S6 that transmits control signal.D/A conversion circuit 439c converts control signal S6 the rotating speed of analog form with control fan 6 (being shown in Fig. 3) to.In addition, above-mentioned lower limit temperature comparing unit 432 can send a power factor and judge signal S7 ' according to the comparative result of above-mentioned detection operations temperature T and lower limit reference temperature T1, come controlled processing unit 439b to handle the first above-mentioned controlling elements A.
By the above-mentioned embodiment of the invention as can be known, the value on the true tool industry of the present invention.Above embodiment's explanation only is preferred embodiment explanation of the present invention, has in the affiliated such as technical field to know that usually the knowledgeable is when doing other all improvement and variation according to the above embodiment of the present invention explanation.Yet all improvement and variation that these are done according to the embodiment of the invention are in the claim that still belongs to invention spirit of the present invention and define.
Claims (11)
1. fan control system in order to temperature and the power of surveying at least one work package, is controlled the rotating speed of at least one fan that is used to cool off this work package, and this system comprises:
At least one work package temperature probe unit is in order to survey the temperature of this work package, to obtain a work package temperature;
At least one work package power probe unit is in order to survey the power of this work package, to obtain a work package power; And
One fan control circuitry, be communicated with this work package temperature probe unit and this work package power probe unit respectively, and be preset with a upper limit reference temperature and the reference power that a lower limit reference temperature, is higher than this lower limit reference temperature respectively at above-mentioned work package, compare in this work package temperature and this lower limit reference temperature and this upper limit reference temperature, and after this work package power and this reference power compare, export the rotating speed that at least one control signal is controlled this fan according to this.
2. fan control system as claimed in claim 1 wherein, when this work package temperature during greater than this lower limit reference temperature, can be sent out one first controlling elements; When this work package temperature during, can send out one second controlling elements greater than this upper limit reference temperature; When this work package power during, can send out one the 3rd controlling elements greater than this reference power.
3. fan control system as claimed in claim 2, wherein, this fan control circuitry also includes a weight adder, it is preset with at least one proportioning weight, come to multiply each other with these first controlling elements, these second controlling elements and the 3rd controlling elements respectively, and each product addition of the back gained that will multiply each other, to export this control signal.
4. fan control system as claimed in claim 1, wherein, this fan control circuitry also includes:
One power signal transmissions circuit, in order to transmit a factor I signal of representing one first controlling elements, wherein, these first controlling elements are this work package power;
One control switch is communicated in this power signal transmissions circuit, and has a closed circuit position, an open-circuit position and a grounding end; And
One lower limit temperature comparing unit, in order to this work package temperature and this lower limit reference temperature are compared, when this work package temperature is higher than this lower limit reference temperature, this control switch can be switched to this open-circuit position, to send out this factor I signal, when this work package temperature is lower than this lower limit reference temperature, this control switch can be switched to this closed circuit position, so that this factor I signal is via this closed circuit position and this grounding end and ground connection.
5. fan control system as claimed in claim 4, wherein, this power signal transmissions circuit includes a current limliting assembly, flows into the electric current of this fan control circuitry with restriction.
6. fan control system as claimed in claim 4, wherein, this fan control circuitry also includes a Buffer Unit, is communicated in this power signal transmissions circuit, stably to transmit this factor I signal.
7. fan control system as claimed in claim 4, wherein, this fan control circuitry also includes:
One upper limiting temperature comparing unit in order to this work package temperature and this upper limit reference temperature are compared, produces a factor signal of representing one second controlling elements according to this;
One reference power comparing unit in order to this work package power and this reference power are compared, produces a factor III signal of representing one the 3rd controlling elements according to this; And
One control gate, be communicated with this upper limiting temperature comparing unit and this reference power comparing unit respectively, to control the transmission of this factor signal and this factor III signal, when this work package temperature is higher than this lower limit reference temperature, can send out this factor signal, when this work package temperature is lower than this upper limit reference temperature, then interrupt transmitting this factor signal, when this work package power is higher than this reference power, can send out this factor III signal, when this work package power is lower than this reference power, then can interrupt transmitting this factor III signal.
8. fan control system as claimed in claim 7, wherein, this lower limit temperature comparing unit, this upper limiting temperature comparing unit and this reference power comparing unit are respectively a comparison amplifier.
9. fan control system as claimed in claim 7, wherein, this control gate be one or the door.
10. fan control system as claimed in claim 7, wherein, this fan control circuitry also includes a weight adder, it is preset with at least one proportioning weight, to multiply each other with these first controlling elements, these second controlling elements and the 3rd controlling elements respectively, and each product addition of the back gained that will multiply each other, to export this control signal.
11. fan control system as claimed in claim 1, wherein, this fan control circuitry also includes:
One analog-to-digital conversion circuit is that this work package power that will be surveyed converts digital form to by analog form;
One processing unit, according to the comparative result of this work package temperature and this lower limit reference temperature and this upper limit reference temperature, and the comparative result of this work package power and this reference power, and send this control signal with digital form; And
One D/A conversion circuit converts this control signal to analog form to control the rotating speed of this fan.
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| CNA2007100043149A CN101230864A (en) | 2007-01-22 | 2007-01-22 | Fan control system |
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| CN103883540A (en) * | 2012-12-19 | 2014-06-25 | 茂达电子股份有限公司 | Heat Dissipation System, Rotation Speed Control Circuit And Method Thereof |
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2007
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