CN1474062A - Method and device for closed-loop controlling cooling fan rotation speed according to CPU temperature - Google Patents
Method and device for closed-loop controlling cooling fan rotation speed according to CPU temperature Download PDFInfo
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Abstract
The method of closed-loop controlling cooling fan rotation speed according to CPU temperature includes at least the following steps: detecting CPU core temperature with a sensor inside the CPU and number conversion with controller; setting knee point temperature for CPU and corresponding cooling fan relationship; detecting speed of cooling fan; feeding the detected speed of the cooling fan to controller for comparison and controlling the fan based on comparison result; and making the cooling fan operate in proper speed corresponding to different CPU temperature. The cooling fan for CPU and that for the system are detected and controlled separately. Several, preferably 3, knee point temperature values for CPU are set with corresponding fan rotation speed. The present invention can reduce system noise and ensure long service life of devices.
Description
Technical field
The present invention relates to a kind of method and apparatus that carries out the CPU cooling by fan, especially a kind of temperature, the cooling CPU of control cpu fan rotating speed and case fan rotating speed, and the method and the device thereof of reduction machine system noise according to CPU.Belong to the computer technology application.
Background technique
At present, increasing computer vendors is attached great importance to the noise of machine system, and particularly famous both at home and abroad computer vendors is all at the noise that reduces machine system in various modes.Just present situation of adding up, the source of computer noise produces when a large portion is arranged by cpu fan and case fan full-speed operation, and rotating speed high noisy more is big more.And the noise that cpu fan, case fan full-speed operation bring has been ignored for the needs that satisfy heat radiation merely by some manufacturer.CPU is operated in full load condition constantly in fact, the load of CPU and little under the normal situation about using of majority, the heating value of CPU neither be very big in this case, the full-speed operation of cpu fan and system fan is exactly a kind of waste so in this case, has also brought very big noise simultaneously.If reduce the rotating speed of cpu fan and system fan in this case, so both can guarantee that the CPU proper functioning had also reached quiet purpose simultaneously, make the user that one " quietly computer " be arranged.
Certainly, the method of this reduction noise is not with ignoring that the heat radiation of CPU is abandoned, and this in fact method is to come the rotating speed of dynamic adjustments cpu fan and system fan according to the heating value of CPU, make cpu fan and system fan be controlled by the heating value of CPU, along with the difference of CPU heating value is dynamically controlled cpu fan and system fan provides different rotating speeds, just between CPU heating value and cpu fan and system fan, set up a kind of close contact, so not only can guarantee the heat radiation of CPU but also can reach the purpose that machine system reduces noise.
Summary of the invention
The object of the present invention is to provide a kind of method and device thereof according to the cpu temperature closed-loop controlling cooling fan rotation speed, it can control cpu fan rotating speed and case fan rotating speed according to cpu temperature, under the situation that satisfies the host computer heat radiation, reduce the noise of machine system.
Another purpose of the present invention is to provide a kind of method and device thereof according to the cpu temperature closed-loop controlling cooling fan rotation speed, makes cpu fan and system fan stable operating voltage, can guarantee the device long service life, and rotating speed output accurately.
For this reason, the invention provides following technological scheme and realize above-mentioned purpose:
A kind of method according to the cpu temperature closed-loop controlling cooling fan rotation speed, which comprises at least following steps: set the CPU inflection temperature, set up the corresponding relation between cooling fan rotation speed and the CPU core temperature, the interior nuclear temperature that corresponding CPU is different, cooling fan works in different rotating speeds; Utilize the CPU internal sensor to detect the CPU core temperature, the cpu temperature value corresponding is converted by controller; Detect cooling fan rotation speed; To detect cooling fan rotation speed and send controller to compare, according to comparative result control rotation speed of the fan.
Cooling fan comprises cpu fan and system fan.Independently detect respectively and control for cpu fan and system fan.
Particularly, cpu fan, the control of system fan rotating speed, are controlled the average voltage of fan, and are carried out speed governing by output control circuit by controller.The control fan voltage comprises that voltage is carried out pulse width modulation controlled produces ripple voltage, generates the operating voltage with dutycycle.Output control circuit also further comprises rectification circuit, this rectification circuit is arranged between pulse-width modulation circuit and the fan control end and is used to provide operating voltage stably, after cpu temperature arrives and is lower than inflection temperature one numerical value of N, adjust the rotating speed of fan again, prevent the fan speed-regulating vibration.
The inflection temperature rotational speed regulation is Schmidt's curve controlled mode.
The CPU inflection temperature is made as more than one, is preferably 3, and cpu fan, system fan are provided with corresponding rotating speed.
Another technological scheme of the present invention provides a kind of control gear according to the cpu temperature closed-loop controlling cooling fan rotation speed.It comprises inner temperature transducer of CPU and controller, and sensor output connects controller.Its middle controller comprises detected temperatures signal processing conversion module, is used for being stored in the register of this controller after the processes temperature signal conversion; The CPU inflection temperature is set in this controller, set up the corresponding relation of cpu temperature and cooling fan rotation speed, this controller comparison module will import cpu temperature in real time and cooling fan rotation speed numerical value compares, and the output control signal is managed cooling fan rotation speed by control circuit.Cooling fan is cpu fan, system fan.Cpu fan, system fan have respectively and independently detect control circuit and output control circuit.
Detecting control circuit is the interface of fan and mainboard, and it reads rotation speed of the fan, offers temperature controller by pulse signal.
Output control circuit comprises a voltage pulse-width modulation circuit, adjusts fan power supply voltage mean value, and mean value changes, and rotation speed of the fan changes.Wherein pulse-width modulation circuit is made of resistance R 1, R2, R3 and triode T1, field effect transistor G1; Controller output connecting resistance R1, field effect transistor G1 output wind-receiving fan control end.
Further, output control circuit also comprises rectification circuit, and this rectification circuit is arranged between pulse-width modulation circuit and the fan fan control end and is used to provide operating voltage stably, and this circuit is made of inductance L 1, capacitor C 1 and diode D1.
Compared with prior art, the present invention has tangible advantage: it comes the rotating speed of dynamic adjustments cpu fan and system fan according to the heating value of CPU, make cpu fan and system fan be controlled by the heating value of CPU, along with the difference of CPU heating value is dynamically controlled cpu fan and system fan provides different rotating speeds, just between CPU heating value and cpu fan and system fan, set up a kind of close contact, under different CPU heating values, provide different rotation speeds of the fan like this, under the little situation of CPU heating value, provide lower rotation speed of the fan to keep low noise, under the very big situation of CPU heating value, provide higher rotation speed of the fan to guarantee the heat radiation of CPU, so not only can guarantee the heat radiation of CPU but also can reach the purpose that machine system reduces noise, and this monitoring and control are real-time, and is dynamic.
Have, the present invention reduces the noise under the machine system normal operation greatly again, makes it be lower than the 36db that GB requires.
In addition, the present invention can not cause too high cost to increase for mainboard yet, and the macroeconomic performance is relatively good.
Description of drawings
Fig. 1 is the electric connecting relation figure between temperature control controller and the CPU.
Fig. 2 is cpu temperature of the present invention and cpu fan rotating speed corresponding relation schematic representation.
Fig. 3 is the circuit theory diagrams of rotation speed of the fan monitoring of the present invention and control.
Fig. 4 is the pulse-width signal schematic representation of fan of the present invention.
Fig. 5 is the inventive method flow chart.
Fig. 6 constitutes block diagram for control module of the present invention.
Fig. 7 is the cpu fan rotating speed and the cpu temperature corresponding relation schematic representation of a kind of preferred embodiment of the present invention.
Fig. 8 is the system fan rotating speed and the cpu temperature corresponding relation schematic representation of a kind of preferred embodiment of the present invention.
Embodiment
The present invention is a kind of method and device thereof according to the cpu temperature closed-loop controlling cooling fan rotation speed, its main thought is to come according to the heating value of CPU the rotating speed of dynamic adjustments cpu fan and system fan, make cpu fan and system fan be controlled by the heating value of CPU, along with the difference of CPU heating value is dynamically controlled cpu fan and system fan provides different rotating speeds, just between CPU heating value and cpu fan and system fan, set up a kind of close contact, under different CPU heating values, provide different rotation speeds of the fan like this, under the little situation of CPU heating value, provide lower rotation speed of the fan to keep low noise, under the very big situation of CPU heating value, provide higher rotation speed of the fan to guarantee the heat radiation of CPU, so not only can guarantee the heat radiation of CPU but also can reach the purpose that machine system reduces noise, and this monitoring and control are real-time, and is dynamic.
Particularly, the temperature monitoring of the first step of the present invention, realization CPU.
Here the monitoring mode of cpu temperature is a thermal diode of utilizing CPU inside, because thermal diode is built in the CPU core, therefore (heating value of CPU is embodied on the interior nuclear temperature of CPU can to embody the interior nuclear temperature of CPU very accurately, it is just unstable that the CPU core temperature surpasses a certain specified value work, even burn CPU).In present CPU, the support of this function is provided, thermal diode that just CPU is inner integrated is for the usefulness of user's monitor temperature.
In the computer motherboard design, the inner integrated thermal diode of CPU is connected to specific electric connecting mode in the chip of carrying out temperature monitoring and realization Temperature Treatment, this chip kind is a lot, the temperature control controller that at present commonly used is on the computer motherboard, the function that this chip provides the cpu temperature signal to receive and handle.Electric connecting relation between it and the CPU as shown in Figure 1.
The reception and the processing of second step, realization cpu temperature.
The thermal diode of temperature control controller by electric connecting relation shown in Figure 1 and CPU inside is connected the back just can receive the temperature signal that send CPU inside, and its utilizes the function module of inside that the temperature signal that receives is handled.Thereby portion has a specific formula to come the treatment temperature signal to draw the temperature value of CPU within it, and this formula is as follows:
Ifw＝Is{ê[(Vd*q)/(nkT)]-1}
Ifw is the forward conduction electric current 5-300 μ A of thermal diode;
N is the desirable factor 1.0057-1.0125 (value is 1.0080 usually) of thermal diode;
Is is a saturation current;
Q is an electric weight;
Vd is a forward voltage drop;
K is a fixedly constant, and is given by the MANUFACTURER of temperature control controller;
T is a Kelvin temperature, just the CPU core temperature;
Principle is: along with the variation Ifw of CPU core temperature T constantly changes, this variation is reflected in the temperature control controller, temperature control controller temperature inside monitoring modular is according to the computing opposite with top mathematical equation, variation according to Ifw converses temperature value, result as the temperature detection, and be stored in the register of temperature control controller inside so that use when reading cpu temperature in system, so just finished the monitoring of cpu temperature.
The inflection temperature of the 3rd step, setting CPU is set up the corresponding relation between cpu temperature and cpu fan, the case fan.
By setting the inflection temperature of CPU, the operating temperature of CPU is divided into three intervals, system reads out the cpu temperature value that monitors with inflection temperature and does contrast in second step, be arranged in which temperature range with the temperature of determining current C PU, operate under the different rotating speeds with case fan at different temperature range cpu fans.
When cpu temperature was lower than T1, fan work was under the Speed1 rotating speed;
When cpu temperature was higher than T1 but is lower than T2, fan work was under the Speed2 rotating speed;
When cpu temperature is higher than T2, fan work (usually just maximum speed) under the Speed3 rotating speed;
Its corresponding relation as shown in Figure 2.
The monitoring and the control of the 4th step, cpu fan and case fan rotating speed.
For the cpu temperature realizing setting up in the 3rd step and the corresponding relation of cpu fan and system fan rotating speed, also must monitor the rotating speed of cpu fan and system fan so that in real time its rotating speed is done regulation and control, because know just which rotating speed they are operated under after only monitoring the rotating speed of cpu fan and system fan, whether satisfy the corresponding relation of setting up in the 3rd step (as Fig. 2), if do not satisfy, the rotating speed that then will control cpu fan and system fan makes it turn round according to the curve that Fig. 2 sets up.Figure 3 shows that the circuit theory diagrams of rotation speed of the fan monitoring and control.
The monitoring of rotation speed of the fan: as Fig. 3, FAN3P is exactly the interface of fan and mainboard, it is an interface that three pins are arranged, the function of the 3rd pin of FAN3P (fan interface) reads rotation speed of the fan exactly, this pin also links to each other with Sensor (sensor) input end of temperature control controller, holds and then is connected to the tachometer of temperature control controller inside from Sensor.Fan whenever rotates a circle and just sends two pulses, constantly pulse is just constantly sent in rotation, these pulses send the Sensor end of exporting to the temperature control controller by the 3rd pin of FAN3P from fan inside, and then be sent in the tachometer of temperature control controller inside, the tachometer of temperature control controller inside calculates rotation speed of the fan by calculating pulse number, has so just reached the purpose of monitoring rotation speed of the fan.
The control of rotation speed of the fan: after monitoring rotation speed of the fan, whether the present rotating speed of system test satisfies corresponding relation shown in Figure 2, if do not satisfy, then system makes it satisfy corresponding relation shown in Figure 2 by the rotating speed of control device adjustment fan.
Specific implementation fan control function also be to finish by the temperature control controller on the mainboard, internal logic medium speed monitoring modular and rotational speed control module at it are associated, the monitoring modular of temperature control controller inside was given rotational speed control module with the feedback information that monitors after rotation speed monitoring was finished, rotational speed control module is adjusted the dutycycle of PWM by PWM (pulse width modulation controlled) mode, the power supply voltage of fan is changed, or improve or reduce, the variation of fan power supply voltage causes the variation of rotation speed of the fan, the principle of rotation speed of the fan control that Here it is.
As Fig. 3, FANPWM (pulse-width signal of fan) is exactly the pin that is used to send pulse signal above the temperature control controller.
As shown in Figure 4 be exactly the pulse signal that FANPWM sends, its cycle is fixed, but its pulse width is adjustable, HIGH represents high level, and LOW represents low level, the time that on behalf of high level, Th continue, the time that on behalf of low level, T1 continue, by adjusting the mean value that the lasting time T h of high level just can adjust the fan power supply voltage, the mean value of fan power supply voltage is changed once the rotating speed that is changed fan, has also just realized rotation speed of the fan control.
Flow process of the present invention is:
System's power-up initializing at first, to inflection temperature T1, T2, the speed turning point Vcpu1 of cpu fan, Vcpu2, Vcpu3, the speed turning point Vsys1 of system fan, Vsys2, Vsys3 are provided with;
Start the back system and read current cpu temperature Tc;
When cpu temperature Tc was lower than inflection temperature T1, cpu fan Vcpu was with Vcpu1 running (as Fig. 7), and system fan Vsys is with Vsys1 running (as Fig. 8);
For guaranteeing that cpu fan and system fan are with Vcpu1, the Vsys1 running, system can read the value of Vcpu and Vsys in real time and come and Vcpu1, VSys1 compares, in case find Vcpu, Vsys and Vcpu1, Vsys1 is not inconsistent, just start the operation that fan control module promotes or reduces Vcpu and Vsys, make Vcpu, Vsys can follow Vcpu1 constantly, Vsys1, the purpose of doing like this is for cpu fan that adapts to various different sizes and system fan, and avoid some fan performance instability to cause the fixed situation of rotary speed unstabilization, can avoid occurring problems such as the bad CPU of causing of heat radiation burns like this;
This fan control module comprises two links: ripple voltage produces link and rectification link (be illustrated in figure 3 as the particular hardware of control module, be illustrated in figure 6 as the block diagram of control module).
Ripple voltage produces link: this link is made up of resistance R 1, R2, R3 and triode T1, a semiconductor field G1, its function is that the control general+12V by FANPWM carries out pulsewidth modulation and handles, and produces the ripple voltage of certain dutycycle at the output terminal of semiconductor field G1.
The rectification link: this link is made up of an inductance coil L1, an electrochemical capacitor C1 and a sustained diode 1, and the inductance value of inductance coil, the capacity of electrochemical capacitor can suitably be selected according to actual conditions.The function of this link is ripple voltage to be produced ripple voltage rectification that link produces be VDC stably, and its wave range can be controlled within the 300mV.And if do not have the rectification link, system still can work, but the voltage that offers fan is a pulsation, it is the shape that is similar to pyramidal wave, there is unfavorable factor in so such power supply voltage to the Hall IC of fan inside, provides jiggly voltage can cause the undesired even damage of Hall IC work to Hall IC for a long time on the one hand; We found through experiments and provide that this can not cause rotation speed of the fan to read through the ripple voltage of over commutation inaccurate on the other hand, and just the Hall IC in the fan can not provide rotation speed of the fan numerical value accurately under this power supply voltage.Therefore we have added the rectification link here, and purpose is to provide an operating voltage stably to fan, make the Hall IC can proper functioning and prolong operating life, also guarantee that fan can export speed revolution value accurately simultaneously.This also is special characteristics that indicate of this design.
Along with the running of system, cpu temperature can rise gradually, and when cpu temperature Tc was higher than inflection temperature T1 but is lower than inflection temperature T2, cpu fan Vcpu was with Vcpu2 running (as Fig. 7), and system fan Vsys is with Vsys2 running (as Fig. 8);
Be similarly and guarantee that cpu fan and system fan turn round with Vcpu2, Vsys2, system can read the value of Vcpu and Vsys in real time and come to compare with Vcpu2, Vsys2, in case finding Vcpu, Vsys and Vcpu2, Vsys2 is not inconsistent, just start fan control module to the operation that Vcpu and Vsys promote or reduce, make Vcpu, Vsys can follow Vcpu2, Vsys2 constantly;
If the long-time very heavy situation of cpu load, the temperature of CPU can continue to rise, and when cpu temperature Tc was higher than inflection temperature T2, cpu fan Vcpu was with Vcpu3 (at full speed) running (as Fig. 7), and system fan Vsys is with Vsys3 (at full speed) running (as Fig. 8);
Be similarly and guarantee that cpu fan and system fan turn round with Vcpu3, Vsys3, system can read the value of Vcpu and Vsys in real time and come to compare with Vcpu3, Vsys3, in case finding Vcpu, Vsys and Vcpu3, Vsys3 is not inconsistent, just start fan control module to the operation that Vcpu and Vsys promote or reduce, make Vcpu, Vsys can follow Vcpu3, Vsys3 constantly.
As Fig. 7, shown in Figure 8: in whole control process, cpu fan and system fan are independent control, and temperature monitoring of the two and rotating speed control are fully independently.And the rotating speed for fear of CPU and system fan vibration occurs at temperature flex point T1 and T2 place, and this controlling schemes has been used Schmidt's curve controlled mode at inflection temperature T1 and T2 place.Promptly when cpu temperature surpasses T1 or T2, cpu fan rotating speed Vcpu rises to Vcpu2 or rises to Vcpu3 from Vcpu2 from Vcpu1, system fan rotating speed Vsys rises to Vsys2 or rises to Vsys3 from Vsys2 from Vsys1, if but along with the increase cpu temperature of rotation speed of the fan reduces gradually, be not that cpu fan rotating speed and system fan rotating speed fall back to a last speed revolution value when cpu temperature falls back to T2 or T1 so, but cpu fan rotating speed and system fan rotating speed just can fall back to a last speed revolution value when cpu temperature falls back to T2-n ℃ or T1-n ℃, have so just avoided cpu fan and system fan the situation of vibration to occur at the inflection temperature place.The numerical value of n can according to circumstances be determined.
It should be noted last that, above embodiment is only unrestricted in order to technological scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technological scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (14)
1, a kind of method according to the cpu temperature closed-loop controlling cooling fan rotation speed, it is characterized in that: which comprises at least following steps: set the CPU inflection temperature, set up the corresponding relation between cooling fan rotation speed and the CPU core temperature, the different interior nuclear temperature of corresponding CPU, cooling fan works in different rotating speeds; Utilize the CPU internal sensor to detect the CPU core temperature, the cpu temperature value corresponding is converted by controller; Detect cooling fan rotation speed; To detect cooling fan rotation speed and send controller to compare, according to comparative result control rotation speed of the fan.
2, method according to claim 1 is characterized in that: cooling fan comprises cpu fan and system fan.
3, method according to claim 2 is characterized in that: independently detect respectively and control for cpu fan and system fan.
4, according to claim 1 or 2 or 3 described methods, it is characterized in that: described cpu fan, the control of system fan rotating speed, are controlled the average voltage of fan, and are carried out speed governing by output control circuit by controller.
5, method according to claim 4 is characterized in that: described control fan voltage comprises that voltage is carried out pulse width modulation controlled produces ripple voltage, generates the operating voltage with dutycycle.
6, method according to claim 4 is characterized in that: described output control circuit also further comprises rectification circuit, and this rectification circuit is arranged between pulse-width modulation circuit and the fan control end and is used to provide operating voltage stably,
7, according to claim 1 or 5 or 6 described methods, it is characterized in that: after described cpu temperature arrives and is lower than inflection temperature one numerical value of N, adjust the rotating speed of fan again, prevent the fan speed-regulating vibration.
8, method according to claim 7 is characterized in that: described inflection temperature rotational speed regulation is Schmidt's curve controlled mode.
9, a kind of control gear according to the cpu temperature closed-loop controlling cooling fan rotation speed, it comprises inner temperature transducer of CPU and controller, sensor output connects controller, it is characterized in that: described controller comprises detected temperatures signal processing conversion module, is used for being stored in the register of this controller after the processes temperature signal conversion; The CPU inflection temperature is set in this controller, set up the corresponding relation of cpu temperature and cooling fan rotation speed, this controller comparison module will import cpu temperature in real time and cooling fan rotation speed numerical value compares, and the output control signal is managed cooling fan rotation speed by control circuit.
10, control gear according to claim 9, it is characterized in that: described cooling fan is cpu fan, system fan.
11, according to claim 9 or 10 described control gear, it is characterized in that: described cpu fan, system fan have respectively and independently detect control circuit and output control circuit.
12, control gear according to claim 11 is characterized in that: described detection control circuit is the interface of fan and mainboard, and it reads rotation speed of the fan, offers temperature controller by pulse signal.
13, control gear according to claim 11 is characterized in that: described output control circuit comprises a voltage pulse-width modulation circuit, adjusts fan power supply voltage mean value, and mean value changes, and rotation speed of the fan changes.
14, control gear according to claim 13 is characterized in that: described output control circuit also further comprises rectification circuit, and this rectification circuit is arranged between pulse-width modulation circuit and the fan control end and is used to provide operating voltage stably.
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