CN1988361A - Fan speed control device and method - Google Patents
Fan speed control device and method Download PDFInfo
- Publication number
- CN1988361A CN1988361A CNA2005100229670A CN200510022967A CN1988361A CN 1988361 A CN1988361 A CN 1988361A CN A2005100229670 A CNA2005100229670 A CN A2005100229670A CN 200510022967 A CN200510022967 A CN 200510022967A CN 1988361 A CN1988361 A CN 1988361A
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- signal
- fan
- rotational speed
- controller
- driving signal
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- Control Of Electric Motors In General (AREA)
Abstract
A rotational speed control device of a fan comprises a controller, a switch and a voltage stabilizer. The controller detects a rotating speed signal of the fan, generates a first driving signal when the rotating speed signal is higher than a preset rotating speed signal, and generates the first driving signal and a second driving signal when the rotating speed signal is lower than the preset rotating speed signal; the switcher is electrically connected with the controller to receive the first driving signal; the voltage stabilizer is electrically connected with the controller, the switcher and the fan, receives the second driving signal and controls the rotating speed of the fan according to the first driving signal and the second driving signal.
Description
Technical field
The present invention relates to a kind of revolution speed control device and method, particularly relate to a kind of revolution speed control device and method of fan.
Background technology
Most electronic system all is equiped with a fan for the usefulness of dispelling the heat, and produces misoperation to prevent this electronic system because of overheated.
As shown in Figure 1, a kind of known fan 1 has a motor 11, if this motor 11 is a DC Brushless Motor, then has a voltage V of rotating speed and this motor 11
MThe character that is directly proportional, if will control the rotating speed of this fan 1, then electrical ties is in this main power source V
CCThis motor 11 can connect in addition again one and can change the linear voltage stabilization assembly 12 of voltage, by a voltage V who changes this linear voltage stabilization assembly 12
T, with this voltage V of this motor 11 of control break
M, and then change the rotating speed of this fan 1, i.e. this voltage V of this motor 11
MBe main power source V
CCDeduct this voltage V of this linear voltage stabilization assembly 12
T(V
M=V
CC-V
T).For example, as this voltage V of this linear voltage stabilization assembly 12
TWhen becoming big, this voltage V of this motor 11 then
MDiminish, make rotating speed slack-off; Yet, though this fan 1 can utilize this voltage V that changes this linear voltage stabilization assembly 12 easily
T, reaching the rotating speed that changes this fan 1, but because this control mode causes power loss to rise, and this linear voltage stabilization assembly 12 also uses and the change of voltage because of long-time, thus more easily heating, and the difficult situation generation of heat radiation is arranged.
For improving above-mentioned shortcoming, as shown in Figure 2, the motor 21 of another kind of known fan 2, except with main power source V
CCOutside the electrically connect, the power switch assembly 22 of also connecting, and import a pulse width modulating signal (pulse width modulation) PWM and control the time of conducting Yu the not conducting of this power switch assembly 22; For instance, when the high level time of the work period of this pulse width modulating signal PWM (dutycycle) is longer, the ON time of this power switch assembly 22 is then longer, and make the rotating speed of this fan 2 accelerate, promptly this electronic system is utilized the length of the high and low level time of this pulse width modulating signal PWM, control the time of the conducting or the not conducting of this power switch assembly 22, to change the rotating speed of this fan 2.But because the noise that this power switch assembly 22 is produced when switching is particularly evident when this fan 2 is the slow-speed of revolution, and as shown in Figure 3, this fan 2 can cause the rapid variation of current change quantity (di/dt) of voltage (Δ V) and unit interval when switching, so cause electromagnetic interference to raise.
From the above, how to provide a kind of revolution speed control device and the method that power loss, electronics are switched the fan of the noise that produced and electromagnetic interference, one of current just important topic of reducing.
Summary of the invention
In view of above-mentioned problem, the purpose of this invention is to provide a kind of revolution speed control device and method of fan, it reduces power loss, electronics switches noise and the electromagnetic interference that is produced, and has preferable heat dissipation.
For achieving the above object, the revolution speed control device according to a kind of fan of the present invention comprises a controller, a switch and a pressurizer.This controller detects a tach signal of this fan, when this tach signal is higher than a desired speed signal, produces one first drive signal, and when this tach signal is lower than this desired speed signal, produces this first drive signal and one second drive signal; This switch then with this controller electrically connect, to receive this first drive signal; This pressurizer and this controller, this switch and this fan electrical ties receive this second drive signal, and according to this first drive signal and this second drive signal, to control the rotating speed of this fan.
For achieving the above object, revolution speed control device according to another kind of fan of the present invention comprises that a controller detects a tach signal of this fan, when this tach signal is higher than a desired speed signal, this controller is according to one first drive signal, control the rotating speed of this fan, and when this tach signal was lower than this desired speed signal, this controller was controlled the rotating speed of this fan according to this first drive signal and one second drive signal.
For achieving the above object, comprise the following steps: to detect a tach signal of this fan by a controller according to the method for controlling number of revolution of a kind of fan of the present invention; Judge that this tach signal is higher or lower than a desired speed signal; When this tach signal was higher than this desired speed signal, this controller was controlled the rotating speed of this fan according to one first drive signal; And when this tach signal was lower than this desired speed signal, this controller was controlled the rotating speed of this fan according to this first drive signal and one second drive signal.
As mentioned above, because of revolution speed control device and method according to a kind of fan of the present invention are in conjunction with voltage control and pulse width modulation control, promptly in a pressurizer and the switch of electrically connecting between a motor of this fan and the positive-negative power, and utilize a controller to control this pressurizer and this switch, when the rotating speed of this fan is higher, control this switch by a pulse width modulating signal, to control the rotating speed of this fan, because it is bigger that the wind that this moment, this fan running produced is cut sound, so the noise that this switch switches is also not obvious, can't increase whole noise content; And when the rotating speed of this fan descends, then the value of this pulse width modulating signal is fixed, change with this pressurizer of a voltage control, then can adjust the rotating speed of this fan lower again, this switch is because voltage and electric current are all very little, and be certain value, so not only reduce the noise that is produced when switching, more significantly reduce electromagnetic interference, and just use this pressurizer to control this moment, because magnitude of voltage not quite just can change the rotating speed of this fan, so help to reduce power loss, more can solve the heat dissipation problem of this pressurizer.
Description of drawings
Fig. 1 is an a kind of schematic diagram that utilizes the known fan that the linear voltage mode controls rotating speed;
Fig. 2 is an a kind of schematic diagram that utilizes the known fan of pulse width modulation control rotating speed;
Fig. 3 is that a kind of known power switch module switches the voltage of generation and a schematic diagram of current waveform;
Fig. 4 is the schematic diagram according to the revolution speed control device of a kind of fan of preferred embodiment of the present invention;
Fig. 5 is the schematic diagram according to the revolution speed control device of the another kind of fan of preferred embodiment of the present invention; And
Fig. 6 is the flow chart according to the method for controlling number of revolution of a kind of fan of preferred embodiment of the present invention.
The reference numeral explanation
1 fan, 11 motors
12 linear voltage stabilization assemblies, 2 fans
21 motors, 22 power switch assemblies
3,4 revolution speed control devices, 31 controllers
32 switchs, 33 pressurizers
5 fans
S
1The first drive signal S
2Second drive signal
Pwm pulse bandwidth modulation signals S
RefThe desired speed signal
S
fTach signal V
CcMain power source
V
MVoltage V
TVoltage
The step of S01-S04 method for controlling number of revolution
Embodiment
Hereinafter with reference to relevant drawings, revolution speed control device and method according to a kind of fan of preferred embodiment of the present invention are described, wherein identical assembly will be illustrated with identical reference marks.
Please refer to shown in Figure 4ly, according to the revolution speed control device 3 of a kind of fan 5 of preferred embodiment of the present invention, it comprises a controller 31, a switch 32 and a pressurizer 33.
This controller 31 detects a tach signal S of this fan 5
f, and in this tach signal S
fBe higher than a desired speed signal S
RefThe time, produce one first drive signal S
1And this controller 31 is in this tach signal S
fBe lower than this desired speed signal S
RefThe time, produce this first drive signal S
1And one second drive signal S
2This controller 31 of present embodiment can be an integrated circuit (IC) or a program-controlled single-chip.
In present embodiment, this first drive signal S
1Can a serve as reasons pulse width modulating signal of outside input, and this second drive signal S
2Then can be a voltage regulation signal, and this voltage regulation signal can be a magnitude of voltage.
32 of this switchs and these controller 31 electrically connects are to receive this first drive signal S
1, in present embodiment, this switch 32 can be a derailing switch.
33 of this pressurizers and this controller 31, this switch 32 and this fan 5 electrically connects, and this pressurizer 33 receives the second drive signal S
2, and according to this first drive signal S
1And this second drive signal S
2, to control the rotating speed of this fan 5.This pressurizer 33 of present embodiment can be a voltage stabilizing didoe or a Zener diode.
As this tach signal S
fBe higher than this desired speed signal S
RefThe time, because the electric current that uses is bigger, so this controller 31 is controlled the rotating speed of this fan 5 by this switch 32, this controller 31 is with this second drive signal S at this moment
2Value be made as zero, and this switch 32 receives this first drive signal S
1And,, control the switched conductive of this switch 32 and the time of not conducting, to change the rotating speed of this fan 5 by the work period that this controller 31 produces pulse width modulating signal by this pressurizer 33.
And as this tach signal S
fBe lower than this desired speed signal S
RefThe time, if still control the rotating speed of this fan 5 by this switch 32, then the work period must be very little, but when the work period is too small, then the electric current that flows through in the unit interval on the motor of this fan 5 is then excessive, so the wind of the noise that easily causes the switch of this switch 32 to switch to be produced during than these fan 5 runnings is cut sound also loudly.
For the switch that reduces switch 32 switches the noise that is produced, in the present embodiment, in this tach signal S
fBe lower than this desired speed signal S
RefThe time, this controller 31 is with this first drive signal S
1Value be made as a fixed value, this fixed value is a predetermined minimum pulse width modulation signal, this predetermined minimum pulse width modulation signal then can be preset in earlier in this controller 31 before these fan 5 entrys into service, so in this tach signal S
fBe lower than this desired speed signal S
RefThe time, the rotating speed of this fan 5 is maintained at the minimum speed of predetermined minimum pulse width modulation signal earlier, and can not continue to diminish; When needs further reduce the rotating speed of this fan 5, then utilize this pressurizer 33 to receive this second drive signal S
2, by changing this second drive signal S
2Magnitude of voltage, change the rotating speed of this fan 5; For example, as this second drive signal S
2Magnitude of voltage when becoming big, then the voltage of the motor of this fan 5 then diminishes, the rotating speed of this fan 5 then can continue to reduce.
Referring again to shown in Figure 5, comprise a controller 31, a switch 32 and a pressurizer 33 according to the revolution speed control device 4 of a kind of fan 5 of another preferred embodiment of the present invention.Wherein, this controller 31, this switch 32 and this pressurizer 33 have identical formation and function with the same components of previous embodiment, so repeat no more.The difference of present embodiment and previous embodiment is, this switch 32 and this controller 31 and this fan 5 electrical ties, this pressurizer 33 then with this controller 31 and this fan 5 electrical ties.
This controller 31 detects this tach signal S of this fan 5
f, as this tach signal S
fBe higher than this desired speed signal S
RefThe time, this controller 31 is with this second drive signal S
2Value be made as zero, this controller 31 promptly utilizes this switch 32 according to this first drive signal S
1Control the rotating speed of this fan 5.And as this tach signal S
fBe lower than this desired speed signal S
RefThe time, this controller 31 is with this first drive signal S
1Value be made as a fixed value, and utilize this pressurizer 33 to change this second drive signal S
2Magnitude of voltage, can make this controller 31 simultaneously according to this first drive signal S
1And this second drive signal S
2, to change the rotating speed of this fan 5.
Please refer to shown in Figure 6ly, it is the flow chart according to the method for controlling number of revolution of a kind of fan of preferred embodiment of the present invention, comprises that step S01 is to step S04.
In step S01, detect this tach signal S of this fan 5 by this controller 31
f
In step S02, judge this tach signal S
fWhether be higher than this desired speed signal S
Ref
In step S03, as this tach signal S
fBe higher than this desired speed signal S
RefThe time, this controller 31 is according to this first drive signal S
1Control the rotating speed of this fan 5.
In step S04, as this tach signal S
fBe lower than this desired speed signal S
RefThe time, this controller 31 is according to this first drive signal S
1And this second drive signal S
2Control the rotating speed of this fan 5.
Owing to can be applicable to the revolution speed control device (referring again to Fig. 4 and Fig. 5) of aforesaid fan according to the method for controlling number of revolution of the fan of preferred embodiment of the present invention, and the execution mode of the method for controlling number of revolution of said fans and effect describe in detail in the revolution speed control device of the fan of previous embodiment, so repeat no more in this.
In sum, because of revolution speed control device and method according to a kind of fan of the present invention are in conjunction with voltage control and pulse width modulation control, promptly in a pressurizer and the switch of electrically connecting between a motor of this fan and the positive-negative power, and utilize a controller to control this pressurizer and this switch, when the rotating speed of this fan is higher, then can control the switch switching of this switch by a pulse width modulating signal, to control the rotating speed of this fan, because it is bigger that the wind that this moment, this fan running produced is cut sound, so the noise that this switch switches is also not obvious, can't increase whole noise content; And when the rotating speed of this fan descends, then the value of this pulse width modulating signal is fixed, change with this pressurizer of a voltage control, so can adjust the rotating speed of this fan lower, this switch is because voltage and electric current are all very little, and be certain value, so not only reduce the noise that is produced when switching, more significantly reduce electromagnetic interference, and just use this pressurizer to control this moment, because magnitude of voltage not quite just can change the rotating speed of this fan, so help to reduce power loss, more can solve the heat dissipation problem of this pressurizer.
The above only is an illustrative, but not is limitation of the present invention.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the claim of the present invention its equivalent modifications of carrying out or change.
Claims (16)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100229670A CN1988361A (en) | 2005-12-19 | 2005-12-19 | Fan speed control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100229670A CN1988361A (en) | 2005-12-19 | 2005-12-19 | Fan speed control device and method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101703490A Division CN102694492A (en) | 2005-12-19 | 2005-12-19 | Device and method for controlling rotating speed of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1988361A true CN1988361A (en) | 2007-06-27 |
Family
ID=38185021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100229670A Pending CN1988361A (en) | 2005-12-19 | 2005-12-19 | Fan speed control device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1988361A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986281A (en) * | 2013-02-08 | 2014-08-13 | 台达电子工业股份有限公司 | DC motor device and DC fan apparatus |
| CN104767438A (en) * | 2015-03-24 | 2015-07-08 | 苏州佳世达电通有限公司 | Motor control method, motor module using motor control method and radiating device |
| CN104081303B (en) * | 2011-12-14 | 2016-12-28 | 博泽沃尔兹堡汽车零部件有限公司 | Control equipment, radiator fan arrangement and method for radiator fan |
-
2005
- 2005-12-19 CN CNA2005100229670A patent/CN1988361A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104081303B (en) * | 2011-12-14 | 2016-12-28 | 博泽沃尔兹堡汽车零部件有限公司 | Control equipment, radiator fan arrangement and method for radiator fan |
| US9581168B2 (en) | 2011-12-14 | 2017-02-28 | Brose Fahrzeugteile Gmbh & Co. Kommanditsellschaft, Wuerzburg | Control device for a radiator fan, radiator fan arrangement and method |
| CN103986281A (en) * | 2013-02-08 | 2014-08-13 | 台达电子工业股份有限公司 | DC motor device and DC fan apparatus |
| CN104767438A (en) * | 2015-03-24 | 2015-07-08 | 苏州佳世达电通有限公司 | Motor control method, motor module using motor control method and radiating device |
| CN104767438B (en) * | 2015-03-24 | 2018-03-06 | 苏州佳世达电通有限公司 | Motor control method and apply its motor module and heat abstractor |
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Application publication date: 20070627 |