CN101408186A - Fan control device and method as well as multiple-fan control device and method - Google Patents
Fan control device and method as well as multiple-fan control device and method Download PDFInfo
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- CN101408186A CN101408186A CNA2008101775384A CN200810177538A CN101408186A CN 101408186 A CN101408186 A CN 101408186A CN A2008101775384 A CNA2008101775384 A CN A2008101775384A CN 200810177538 A CN200810177538 A CN 200810177538A CN 101408186 A CN101408186 A CN 101408186A
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Abstract
The invention provides a fan control device and a method. The device includes a rotating speed detection unit, a phase detector and a control unit; the rotating speed detection unit detects the rotating speed of a fan, which is conversed into the rotating speed signal of the fan and then output to the phase detector; the phase detector receives the rotating speed signal of the fan which is compared with an input reference signal, and outputs a phase difference signal to the control unit; the control unit regulates a driving signal according to the phase difference signal, outputs the driving signal to the fan, controls the rotating speed of the fan, and repeats each of the steps so as to cause the rotating speed signal of the fan and the input reference signal to be synchronous, the phase difference signal to be constant, and the rotating speed signal of the fan to be constant. The invention also provides a multi-fan control device and a method, which use a phase shifter to cause the signals obtained from the same input reference signal by shifting the phase to be respectively used as the input reference signal of each fan in a system, and reduce the interference of the multi-fan to the power source.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of fan control device and method, and windy fan control gear, method.
Background technique
At present, the level of integration and the complexity of communications equipment are more and more higher, often dispose the considerable veneer of quantity in same frame or the cabinet, make that the specific power of system is very high, and thermal design becomes the major issue that system design faces.Generally the mode of Shi Yonging is a fan for cooling, and this mode is installed the fan of some in equipment, realizes the heat exchange of system and external environment by cross-ventilation.Existing fan control mode has: freely rotate, fan is by a special power supply power supply, and in this case, the state of fan itself is uncontrolled; PWM (pulse duration modulation) control is according to the rotating speed of certain algorithm with PWM method adjusting fan; Function of temperature compensation control, this mode as feedback quantity, are regulated the rotating speed of fan according to device temperature automatically.But these controlling methods have following deficiency: fan is uncontrolled when freely rotating, and the rotating speed deviation is big, and noise problem is outstanding; PWM control is subjected to the influence of power supply, fan itself and characteristic device curve; Function of temperature compensation control is subjected to the factor affecting such as duct resistance difference, power supply fluctuation of each fan when the windy fan work of control, rotation speed of the fan can not accurately be controlled, and asynchronous between each fan, to the requirement of power supply than higher, and EMI poor performance.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of fan control device and method and windy fan control gear and method, can accurately control rotation speed of the fan.
In order to solve the problems of the technologies described above, the invention provides a kind of fan control device, comprise rotation speed detection unit, phase discriminator, control unit, wherein:
Described rotation speed detection unit is used to detect rotation speed of the fan, is converted to fan rotating speed signals, outputs to phase discriminator;
Described phase discriminator is used to receive described fan rotating speed signals and an input reference signal compares, and exports a phase signal to described control unit;
Described control unit is used for regulating a drive signal according to described phase signal, exports this drive signal to fan, the control rotation speed of the fan.
Further, said apparatus also can have following characteristics, and described control unit further comprises low-pass filter, fan drives, wherein,
Described low-pass filter after being used for described phase signal carried out filtering and amplify, is exported an analog control signal to fan drives;
Described fan drives is used for a described analog control signal and a reference voltage signal are compared, if described analog control signal greater than described reference voltage signal, then fan drives reduces drive signal, reduces rotation speed of the fan; If described analog control signal is less than described reference voltage signal, then fan drives increases drive signal, improves rotation speed of the fan, equates that it is constant then to keep described drive signal if described analog control signal equals described reference voltage signal.
Further, said apparatus also can have following characteristics, described fan drives is made up of Pwm controller and field effect transistor, described Pwm controller is according to the difference of described analog control signal and described reference voltage signal, change the dutycycle of the grid base driving voltage of described field effect transistor, thereby change described drive signal.
Further, said apparatus also can have following characteristics,
Described phase discriminator be the edge sensitive type leading-the hysteresis phase discriminator;
Described low-pass filter is the first order pole eliminator of being made up of operational amplifier and resistance capacitance;
Described rotation speed detection unit is a photo coupler.
The present invention also proposes a kind of control method for fan, comprises:
Detect rotation speed of the fan, be converted to a fan rotating speed signals;
A described fan rotating speed signals and an input reference signal are compared, export a phase signal;
Regulate a drive signal according to described phase signal, export this drive signal to fan;
Repeat above steps, make that described fan rotating speed signals and described input reference signal are synchronous, described phase signal is constant.
Further, said method also can have following characteristics, regulates a drive signal according to described phase signal and specifically comprises:
After described phase signal carried out filtering and amplify, export an analog control signal;
A described analog control signal and a reference voltage signal are compared,, thereby reduce rotation speed of the fan if described analog control signal greater than described reference voltage signal, then reduces drive signal; If described analog control signal less than described reference voltage signal, then increases drive signal, thereby improve rotation speed of the fan; If described analog control signal equals described reference voltage signal, it is constant then to keep described drive signal.
The present invention also proposes a kind of windy fan control gear, comprises N fan control device of the present invention, also comprises phase shifter, wherein:
Described phase shifter is used for an input reference signal is carried out phase shift, obtains N input reference signal, is input in the described N fan control device input reference signal as a described N fan control device respectively.
Further, said apparatus also can have following characteristics, and the phase place between N the input reference signal that described phase shifter phase shift obtains differs 360 degree/N successively.
The present invention also provides a kind of windy fan controlling method, is used for a system that comprises a plurality of fans, and each fan is used control method for fan of the present invention, and its reference-input signal of each fan obtains after by same input reference signal phase shift.
Further, said method also can have following characteristics, and the phase place between N the input reference signal that described phase shifter phase shift obtains differs 360 degree/N successively.
By the present invention, can realize the precise synchronization of the rotating speed and the input reference frequency of controlled fan, and not be subjected to the influence of fan power supply, characteristic device curve and fan self character.When system is equipped with a plurality of fan, adjust the phase place between the input reference frequency of each fan, make a plurality of fans respectively with different phase lock in input reference frequency, can reduce the interference of fan to power supply.
Description of drawings
Shuo Ming accompanying drawing is used to provide further understanding of the present invention herein, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is a fan control device block diagram of the present invention;
Fig. 2 is system of the present invention control model and transfer function figure;
Fig. 3 is a kind of circuit realization of fan control device of the present invention figure;
Fig. 4 is a windy fan control gear block diagram of the present invention.
Embodiment
The invention provides a kind of new fan control device, based on principle of phase lock loop, the synchronization that realizes fan is in outside input reference frequency, thus the accurate control of realization rotation speed of the fan.In control during windy fan, the phase difference between the input reference frequency of the fan control device by adjusting each fan has reduced the interference of fan to power-supply system, has improved power-efficient and the EMI of system performance.
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
Fig. 1 is a theory diagram of the present invention, and fan control device of the present invention comprises:
Rotation speed detection unit is connected between controlled fan and the phase discriminator, is used for converting the rotary state of fan to a fan rotating speed signals, as the electrical signal of certain frequency, exports this fan rotating speed signals to phase discriminator;
Phase discriminator, be connected between rotation speed detection unit and the low-pass filter, be used to receive the fan rotating speed signals of rotation speed detection unit output, also receive an input reference frequency signal, detect the phase difference between input reference frequency signal and the fan rotating speed signals, export a phase signal to low-pass filter;
Low-pass filter is connected between phase discriminator and the fan drives, is used for the phase signal of phase discriminator output is carried out filtering and amplifies back output one analog control signal to fan drives;
Fan drives is connected between low-pass filter and the controlled fan, is used to receive the analog control signal of low-pass filter output, regulates a drive signal according to this analog control signal, exports this drive signal to controlled fan, realizes the modulation to rotation speed of the fan.Concrete regulating method is, an analog control signal and a reference voltage signal are compared, if analog control signal greater than reference voltage signal, then fan drives reduces drive signal, reduces rotation speed of the fan; If analog control signal is less than described reference voltage signal, then fan drives increases drive signal, improves rotation speed of the fan, equates that it is constant then to keep described drive signal if described analog control signal equals described reference voltage signal.
Fan is connected between fan drives and the rotation speed detection unit, is controlled main body.
Fan rotational frequency control method of the present invention comprises following steps:
Step 110, rotation speed detection unit becomes fan rotating speed signals (as electrical pulsing signal) with the rotary speed information translation of fan;
Step 120, this electrical pulsing signal are carried out bit comparison mutually with input reference frequency and are obtained a phase difference in phase discriminator, phase discriminator output and the proportional voltage pulse of this phase difference (being phase signal);
Step 130, this voltage pulse form an analog control signal V after carrying out lower pass-filter and amplification through low-pass filter
f, be input to the error amplifier input end of fan drives inside;
Step 140, analog control signal V
fWith fan drives reference voltage signal V
RefCompare, if V
fGreater than V
Ref, then fan drives reduces drive voltage signal, reduces rotation speed of the fan, if V
fLess than V
Ref, fan drives increases drive voltage signal, improves rotation speed of the fan, if the two equates that then drive voltage signal is constant, rotation speed of the fan is constant, and wherein, drive voltage signal exports fan to, is used for drive fan.
Above adjustment process lasts till rotation speed of the fan and constant phase difference identical with input reference frequency always, at this moment, and the voltage pulse (phase signal is constant) that phase discriminator output is constant, low-pass filter output voltage V
fWith V
RefEquate that fan drives output is constant, it is constant and synchronous with input reference frequency to keep rotation speed of the fan.After this, when mains voltage variations, characteristic device curve change or other factors when causing that rotation speed of the fan and input reference frequency are inconsistent, system repeats above adjustment process, and is synchronous up to rotation speed of the fan and input reference frequency.
V
RefRealize decision by concrete circuit, the input reference frequency of phase discriminator is realized relevant by user's decision of using this control system with concrete circuit.
Fig. 2 is system of the present invention control model and transfer function block diagram.In Fig. 2, f
Ref(Φ
Ref) expression input reference frequency (phase place); V
1The output voltage of expression phase discriminator; V
2The output voltage of expression low-pass filter; f
Out(Φ
Out) expression rotation speed of the fan (phase place); f
Comp(Φ
Comp) the expression detected rotation speed of the fan of rotation speed detection unit (phase place).The transfer function of system's each several part is: phase discriminator, K
p(v/rad); Low-pass filter, K
f(v/v); Fan drives, K
Ctl(v/v); Fan K
Fan(rad/v.s); Rotation speed detection unit K
d(rad/rad).
Can get thus, the open loop transfer function and the closed loop transfer function of this system are respectively:
H＝K
p·K
f·K
ctl·K
fan
Wherein, the enough big and HK as H
dDuring＞＞l, G ≈ l/K is arranged
d, i.e. Φ
Ref=K
dΦ
OutUsually get K
d=l then has Φ
Ref=Φ
Out, d Φ
Ref/ dt=f
Ref=f
Out=d Φ
Out/ dt.Thus, realized that rotation speed of the fan and input reference frequency are synchronous.
Fig. 3 is that fan control device one circuit of the present invention is realized.
In Fig. 3, the edge sensitive type that phase discriminator is made up of and gate, AND NOT gate, diode etc. is leading-the hysteresis phase discriminator, owing to be edge sensitive type phase discriminator, it is less demanding to the dutycycle of reference frequency, does not need 50% strict dutycycle.
The first order pole eliminator that low-pass filter is made up of operational amplifier MAX492 and resistance capacitance constitutes, during design according to the response characteristic of fan, select suitable resistance and capacitance, it is low as far as possible that the cutoff frequency of low-pass filter should design, and keeps high low-frequency gain simultaneously.The bandwidth of this routine median filter is chosen for 2Hz, and ac gain is set to 10, so resistance r1 gets 10K among the figure, and resistance r2 gets 100k, and electric capacity c1 gets 4.7uf.
Fan drives is made up of PWM controller (model UC2842) and field effect transistor (model IRF3710), UC2842 is according to the difference of the analog control signal and the reference voltage signal of the output of low-pass filter, change the dutycycle of the grid base driving voltage of IRF3710, thereby change the average drive voltage of fan, realize rotation speed of the fan control;
Fan is selected the brshless DC motor fan of band rotating speed output indication, the pulse signal that output was directly proportional with rotating speed when fan rotated for use;
Rotation speed detection unit uses photo coupler to realize, after photo coupler is isolated shaping with the rotating speed output pulse signal of fan, delivers to the feedback input end of phase discriminator, carries out the phase bit comparison.
During this is realized, the power supply of fan employing-48V power supply, phase discriminator, low-pass filter, PWM controller UC2842 etc. adopt the power supply of 3.3V/5V power supply.
Fig. 4 is a windy fan control gear block diagram of the present invention.System has used 3 identical fans, each fan uses fan control device shown in Figure 1 to control, input reference frequency at first passes through phase shifter, produce the input reference frequency that phase shift is respectively 0,120 degree and 240 degree, control 3 independently fans respectively with these 3 input reference frequencies that phase shift obtains, be about to the input reference frequency of these 3 input reference frequencies as the fan control device of these 3 fans.When 3 fans locked respectively, single fan transient current was AC compounent I=I
Dc+ I
Ac, then total transient current of 3 fan consumption is:
I
total＝3I
dc+I
ac(1+e
j0.67π+e
j1.33π)
＝3I
dc+I
ac·(1-0.5+j0.866-0.5-j0.866)
＝3I
dc＜3(I
dc+I
ac)
As seen, when adopting device of the present invention, total transient current of 3 fans is less than 3 fan transient current sums, especially, the AC compounent of electric current is cancelled out each other, this has improved the power factor of fan control system, thereby has reduced the requirement of fan to the instantaneous power of driving power, the interference and the EMI to the power-supply system that reduce also to have reduced fan system of transient current.
Phase shifter can be provided with arbitrarily the phase place of input reference frequency phase shift.Preferably, when the fan number that needs in the system to control is n, be followed successively by 360 degree/n as long as guarantee the phase difference between each fan, its total AC compounent is cancelled out each other, guarantee that promptly the phase difference between n the input reference frequency that phase shifter exports is followed successively by 360/n.Use 3 fans in the present embodiment, therefore, the phase difference between three fans is the 360/3=120 degree.
In sum, it is consistent with input reference frequency that the present invention can control the rotating speed of fan accurately, when windy fan is controlled simultaneously, increases phase-shift circuit, can also improve the requirement of fan to the power supply transient current, improves the EMI performance of system.Owing to be closed loop control system, the present invention can overcome the influence of extraneous factors such as the fan applied environment changes, power supply variation, realizes accurate control all the time.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (10)
1, a kind of fan control device is characterized in that, comprises rotation speed detection unit, phase discriminator, control unit, wherein:
Described rotation speed detection unit is used to detect rotation speed of the fan, is converted to fan rotating speed signals, outputs to phase discriminator;
Described phase discriminator is used to receive described fan rotating speed signals and an input reference signal compares, and exports a phase signal to described control unit;
Described control unit is used for regulating a drive signal according to described phase signal, exports this drive signal to fan, the control rotation speed of the fan.
2, fan control device as claimed in claim 1 is characterized in that, described control unit further comprises low-pass filter, fan drives, wherein,
Described low-pass filter after being used for described phase signal carried out filtering and amplify, is exported an analog control signal to fan drives;
Described fan drives is used for a described analog control signal and a reference voltage signal are compared, if described analog control signal greater than described reference voltage signal, then fan drives reduces drive signal, reduces rotation speed of the fan; If described analog control signal is less than described reference voltage signal, then fan drives increases drive signal, improves rotation speed of the fan, equates that it is constant then to keep described drive signal if described analog control signal equals described reference voltage signal.
3, fan control device as claimed in claim 2, it is characterized in that, described fan drives is made up of Pwm controller and field effect transistor, described Pwm controller is according to the difference of described analog control signal and described reference voltage signal, change the dutycycle of the grid base driving voltage of described field effect transistor, thereby change described drive signal.
4, as claim 2 or 3 described fan control devices, it is characterized in that,
Described phase discriminator be the edge sensitive type leading-the hysteresis phase discriminator;
Described low-pass filter is the first order pole eliminator of being made up of operational amplifier and resistance capacitance;
Described rotation speed detection unit is a photo coupler.
5, a kind of control method for fan is characterized in that, comprises:
Detect rotation speed of the fan, be converted to a fan rotating speed signals;
A described fan rotating speed signals and an input reference signal are compared, export a phase signal;
Regulate a drive signal according to described phase signal, export this drive signal to fan;
Repeat above steps, make that described fan rotating speed signals and described input reference signal are synchronous, described phase signal is constant.
6, method as claimed in claim 5 is characterized in that, regulates a drive signal according to described phase signal and specifically comprises:
After described phase signal carried out filtering and amplify, export an analog control signal;
A described analog control signal and a reference voltage signal are compared,, thereby reduce rotation speed of the fan if described analog control signal greater than described reference voltage signal, then reduces drive signal; If described analog control signal less than described reference voltage signal, then increases drive signal, thereby improve rotation speed of the fan; If described analog control signal equals described reference voltage signal, it is constant then to keep described drive signal.
7, a kind of windy fan control gear is characterized in that, comprises the described fan control device of a N claim 1, also comprises phase shifter, wherein:
Described phase shifter is used for an input reference signal is carried out phase shift, obtains N input reference signal, is input in the described N fan control device input reference signal as a described N fan control device respectively.
8, windy fan control gear as claimed in claim 7 is characterized in that, the phase place between N the input reference signal that described phase shifter phase shift obtains differs 360 degree/N successively.
9, a kind of windy fan controlling method is used for a system that comprises a plurality of fans, it is characterized in that, each fan is used the described control method for fan of claim 5, and its reference-input signal of each fan obtains after by same input reference signal phase shift.
10, windy fan controlling method as claimed in claim 9 is characterized in that, the phase place between N the input reference signal that described phase shifter phase shift obtains differs 360 degree/N successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101775384A CN101408186B (en) | 2008-11-21 | 2008-11-21 | Fan control device and method as well as multiple-fan control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101775384A CN101408186B (en) | 2008-11-21 | 2008-11-21 | Fan control device and method as well as multiple-fan control device and method |
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| Publication Number | Publication Date |
|---|---|
| CN101408186A true CN101408186A (en) | 2009-04-15 |
| CN101408186B CN101408186B (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101775384A Expired - Fee Related CN101408186B (en) | 2008-11-21 | 2008-11-21 | Fan control device and method as well as multiple-fan control device and method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101871464A (en) * | 2009-04-24 | 2010-10-27 | 环达电脑(上海)有限公司 | Processing device and reading method of fan rotating speed signals |
| CN102011744A (en) * | 2009-09-07 | 2011-04-13 | 鸿富锦精密工业（深圳）有限公司 | Multi-fan control system |
| CN102022366A (en) * | 2010-12-25 | 2011-04-20 | 杭州顿力电器有限公司 | Outer rotor embedded type automatic-control constant-speed direct current brushless centrifugal fan and constant-speed method |
| CN102072182A (en) * | 2010-12-25 | 2011-05-25 | 杭州顿力电器有限公司 | Outer rotor embedded automatic control constant speed DC brushless axial flow fan and constant speed control method |
| CN102192174A (en) * | 2010-03-19 | 2011-09-21 | 元山科技工业股份有限公司 | Method for controlling the rotation speed of fan |
| CN104065309A (en) * | 2013-03-18 | 2014-09-24 | 鸿富锦精密工业（深圳）有限公司 | Fan drive circuit |
| TWI498485B (en) * | 2013-03-18 | 2015-09-01 | Hon Hai Prec Ind Co Ltd | Fan driving circuit |
| TWI563178B (en) * | 2014-02-21 | 2016-12-21 | Asia Vital Components Co Ltd | |
| CN111180891A (en) * | 2020-01-06 | 2020-05-19 | 武汉虹信通信技术有限责任公司 | Adjusting method of multi-frequency electrically-tunable antenna |
| CN112114596A (en) * | 2020-08-24 | 2020-12-22 | 中国科学院长春光学精密机械与物理研究所 | Embedded active vibration isolation acquisition control system |
| US12104611B2 (en) | 2021-02-05 | 2024-10-01 | Sentelic Corporation | Fan system and fan driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101871464A (en) * | 2009-04-24 | 2010-10-27 | 环达电脑(上海)有限公司 | Processing device and reading method of fan rotating speed signals |
| CN102011744A (en) * | 2009-09-07 | 2011-04-13 | 鸿富锦精密工业（深圳）有限公司 | Multi-fan control system |
| CN102192174A (en) * | 2010-03-19 | 2011-09-21 | 元山科技工业股份有限公司 | Method for controlling the rotation speed of fan |
| CN102072182B (en) * | 2010-12-25 | 2015-02-25 | 杭州顿力电器有限公司 | Outer rotor embedded automatic control constant speed DC brushless axial flow fan and constant speed control method |
| CN102072182A (en) * | 2010-12-25 | 2011-05-25 | 杭州顿力电器有限公司 | Outer rotor embedded automatic control constant speed DC brushless axial flow fan and constant speed control method |
| CN102022366A (en) * | 2010-12-25 | 2011-04-20 | 杭州顿力电器有限公司 | Outer rotor embedded type automatic-control constant-speed direct current brushless centrifugal fan and constant-speed method |
| CN104065309A (en) * | 2013-03-18 | 2014-09-24 | 鸿富锦精密工业（深圳）有限公司 | Fan drive circuit |
| TWI498485B (en) * | 2013-03-18 | 2015-09-01 | Hon Hai Prec Ind Co Ltd | Fan driving circuit |
| US9534611B2 (en) | 2013-03-18 | 2017-01-03 | Hon Hai Precision Industry Co., Ltd. | Fan driving circuit |
| TWI563178B (en) * | 2014-02-21 | 2016-12-21 | Asia Vital Components Co Ltd | |
| CN111180891A (en) * | 2020-01-06 | 2020-05-19 | 武汉虹信通信技术有限责任公司 | Adjusting method of multi-frequency electrically-tunable antenna |
| CN111180891B (en) * | 2020-01-06 | 2021-12-14 | 武汉虹信科技发展有限责任公司 | Adjusting method of multi-frequency electrically-tunable antenna |
| CN112114596A (en) * | 2020-08-24 | 2020-12-22 | 中国科学院长春光学精密机械与物理研究所 | Embedded active vibration isolation acquisition control system |
| US12104611B2 (en) | 2021-02-05 | 2024-10-01 | Sentelic Corporation | Fan system and fan driving method |
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