CN1298104C - Circuit for eliminating shock noise of speed-adjustable fan - Google Patents
Circuit for eliminating shock noise of speed-adjustable fan Download PDFInfo
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- CN1298104C CN1298104C CN 03119467 CN03119467A CN1298104C CN 1298104 C CN1298104 C CN 1298104C CN 03119467 CN03119467 CN 03119467 CN 03119467 A CN03119467 A CN 03119467A CN 1298104 C CN1298104 C CN 1298104C
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- fan
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Abstract
The present invention relates to a circuit for eliminating the vibration and the noise of a speed regulating fan. A standard triode is added to control the supply of proper current to a fan, a resistance-capacitance circuit is added to control the increasing rate of stator current, and a diode is added to control the inverse voltage of fan induction. As a result, the defect is overcome that the conventional pulse width modulation method for controlling the rotary speed of a fan can cause a fan to generate vibration and noise, and pulse width modulation technology for controlling the rotary speed of a fan can be really adopted in an electronic system with a high silence requirement.
Description
Technical field
The present invention relates to the rotation speed of the fan control technology of the quiet design field of a kind of electronic product, particularly relate to a kind of circuit of eliminating the speed-regulating fan vibrating noise.
Background technology
Along with the electronic product profile to frivolous miniaturization, function develops to high-performance, high power direction, two quality index that how to solve the heat radiation of electronic product and quiet this mutual contradiction become one of core technology problem of restriction design of electronic products.Because the power of general not performance maximum always during the electronic product real work, even most of the time very, system only is operated in 50% of maximum power, even lower, so the noise when adopting the rotation speed of the fan control technology to reduce system's real work solves heat radiation and quiet contradiction becomes a kind of popular solution gradually.The method that the control of extensive use reduces rotation speed of the fan is a pulse duration modulation method, promptly modulates the pulse width signal of the anodal maximum voltage of fan, and the time that is energized with the excitation winding of control fan stator is reduced the speed of rotor.
Present pulse-width modulated fan control method has a very big shortcoming: no matter where the flabellum of fan is still in, when the cathode voltage of fan is connected, excitation winding in the fan is energized immediately, this can impose on the instantaneous moment at random of fan, this moment at random very easily causes the vibrations of fan drum, thereby produce the noise of ticktock, this noise is because frequency ratio is lower, can cause the bad sensation of user, could be made pulse-width modulated fan rotating speed control technology really obtain actual application so must eliminate to sound quality.
In view of this, the design people actively study innovation based on abundant practical experience and professional knowledge, through constantly studying, design, and after studying sample and improvement repeatedly, creates the present invention who has practical value finally.
Summary of the invention
Technical problem underlying to be solved by this invention is, overcome the defective of existing pulse duration modulation method, and a kind of circuit of eliminating the speed-regulating fan vibrating noise is provided, it is eliminated because fan drum vibrations and the noise that pulse-width modulated fan rotating speed control technology causes.
The present invention solves its technical problem underlying and realizes by the following technical solutions.A brushless DC electric machine as shown in Figure 1, rotor (3) is by the position of position transducer perception self, each group coiling of motor is successively by switch-actuated, rotor (3) trend and excitation winding (1) thereby even up rotates (although the stator of most of DC fan generally is inner most and the outermost fan frame that fuses with it, rotor is the part with flabellum, but operation principle for the explanation fan, stator inside and as broad as long outside, so, stipulate that at this stator in all figures all is outside, rotor all is inside).
Can draw following machine power equation from Principle of Electric Engine figure shown in Figure 2:
Wherein:
T=torque (NM)
The synthetic inertia angular momentum of J=motor load and rotor
ω
m=instantaneous angular velocity
The equivalent damping coefficient of B=load and rotor
T
LThe moment of=load
Instantaneous moment when magnetic pole is energized:
T=torque (NM) (negative sign represents that the effect of electromagnetic moment is that the direction of stator and rotor is evened up)
The number of P=magnetic pole (2)
Mutual induction coefficient when Lsr=stator and rotor are evened up
The electric current of Is=stator
The electric current of Ir=rotor
θ
mActual angle between=rotor and the stator
When adopting the rotating speed of method control fan electromotor of pulse-width modulation, in case pulse-width signal provide, though stator (4) and rotor (3) where, excitation winding (1) is energized at once.As can be seen, this position is very important to minimizing instantaneous moment in the momental equation, because the actual angle of the determining positions of stator and rotor between them.This moment at random is certain to cause the vibrations of fan drum, thereby produces the conversion noise of ticktock.
For the brush DC formula fan that the permanent magnetism step-by-step controller is generally arranged in the rotor (general electronic system fan all adopts this kind fan), instantaneous moment can be reduced to:
T＝-K×i
s×sin(θ
m)
Wherein: T=torque (NM) (negative sign represents that the effect of electromagnetic moment is that the direction of stator and rotor is evened up)
K=constant (relevant) with the size and the magnetic force of the number of magnetic poles of motor and permanent magnet
The electric current of Is=stator
θ
mActual angle between=rotor and the stator
As can be seen, if control just can reduce even eliminate this instantaneous moment, thereby weaken the vibrations of fan by the current increasing rate of stator, and then reduce the fan conversion noise.
Method according to the present invention's proposition: utilize the control of standard triode to provide suitable current to fan, utilize the increment rate of resistance-capacitance circuit control stator current, utilize the counter voltage of diode control fan induction, wherein, the above-mentioned standard triode control that utilizes provides suitable current to fan, be that collector electrode with the standard triode is connected the grounded emitter of this standard triode with the negative pole of controlled DC fan; The above-mentioned increment rate of utilizing resistance-capacitance circuit control stator current, be between the base stage of pulse-width signal incoming line and standard triode, to add a resistance, between pulse-width signal incoming line and control positive source, add a resistance, between the base stage of standard triode and collector electrode, be connected an electric capacity; The above-mentioned counter voltage of utilizing the induction of diode control fan, be DC fan just/negative the two poles of the earth on diode in parallel, the negative electrode of diode connects the positive pole of DC fan, the anode of diode connects the negative pole of DC fan, can achieve the above object.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, the invention solves the defective that conventional pulse-width modulated fan method for controlling number of revolution can cause fan vibrations and noise, make pulse-width modulated fan rotating speed control technology really can use in the quiet electronic system that has higher requirements.
In sum, a kind of circuit of eliminating the speed-regulating fan vibrating noise of the present invention, it is in limited field, technical development space, no matter substantive innovation is all being arranged on the method or on the function, and having large improvement technically, really is a new and innovative, progressive, practical new design.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the motor configuration figure that the present invention is used for principle of specification.
Fig. 2 is the basic motor circuit schematic diagram that the present invention is used for principle of specification.
Fig. 3 is the circuit diagram that elimination pulse-width modulated fan rotating speed that the present invention is used for three-way fan causes fan vibrations and noise.
Fig. 4 is the circuit diagram that elimination pulse-width modulated fan rotating speed that the present invention is used for three-way or two line fans causes fan vibrations and noise.
Wherein: 1. excitation winding 2. magnetic poles 3. rotors 4. stators
DTACHn/ATACH---fan speed feedback line
PWMn---pulse-width signal incoming line
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to a kind of circuit of eliminating the speed-regulating fan vibrating noise that foundation the present invention proposes, its embodiment, feature and effect thereof, describe in detail as after.
See also the circuit diagrams three-way or two line fans that are applicable to shown in Figure 3, a kind of circuit of eliminating the speed-regulating fan vibrating noise of the present invention, it mainly comprises: control provides suitable current to fan; The increment rate of control stator current; Counter voltage three parts of control fan induction.It mainly is made up of standard triode, diode, resistance and electric capacity.Wherein: the collector electrode of triode Q1 is connected with the negative pole of controlled DC fan, is operated in linear zone in order to make equipment as far as possible, best equipment is the triode that adopts a standard.Capacitor C 1 of cross-over connection between the base stage of triode Q1 and collector electrode is at the base stage of triode and the output PWM of fan control chip
NBetween connect with a resistance R 2, at the output PWM of fan control chip
NBe connected with a resistance R 1 between the mainboard integrated circuit power supply because time constant and (R1+R2) * C1 be directly proportional, the resistance-capacitance circuit time constant that R1, R2 and C1 form is big more, the increment rate of control stator current is slow more, effect is good more; Diode D1 in parallel between the positive and negative polarities of controlled DC fan, the negative electrode of D1 connects the positive pole and the 12V DC power supply of controlled DC fan, and the anode of D1 connects the negative pole of controlled DC fan.Adding D1, is to avoid after opening device and closing and since the response characteristic of motor make the voltage of controlled DC fan reach-15V is to-30V, damages the situation of fan possibly.The emitter of triode Q1 connects an end of one 1 Ω resistance and a 100nF electric capacity simultaneously, and the other end of 1 Ω resistance is connected with the mainboard ground wire and the other end of 100nF electric capacity connects the speed feedback line of fan test chip on the mainboard.When connecting a three-way DC fan in this circuit, the fan of this fan line that tests the speed is vacant.
See also the circuit diagram that is only applicable to three-way fan shown in Figure 3, a kind of circuit of eliminating the speed-regulating fan vibrating noise of the present invention, its part that mainly comprises is identical with foregoing circuit figure with element, the collector electrode of triode Q1 is connected with the negative pole of controlled DC fan, capacitor C 1 of cross-over connection between the base stage of triode Q1 and collector electrode is at the base stage of triode and the output PWM of fan control chip
NBetween connect with a resistance R 2, at the output PWM of fan control chip
NBe connected with a resistance R 1 between the mainboard integrated circuit power supply, the emitter of triode Q1 is connected with the mainboard ground wire, diode D1 in parallel between the positive and negative polarities of controlled DC fan, the negative electrode of D1 connects the positive pole and the 12V DC power supply of controlled DC fan, the anode of D1 connects the negative pole of controlled DC fan, at the positive pole of controlled DC fan and the fan 1K resistance of cross-over connection between the line that tests the speed, the speed feedback line DTACH of fan test chip on fan tests the speed line and mainboard
NBetween 15K resistance of cross-over connection, the speed feedback line DTACH of fan test chip on mainboard
NAnd 10K resistance of cross-over connection between the mainboard ground wire.
The concrete parameter of element is to be the fan design of 250mA for rated current among above-mentioned Fig. 3, and for the bigger fan of power, the numerical value of element may need to change.The principle of selecting is promptly to satisfy the pulse-width signal frequency of current setting and the time constant of duty ratio decision, the electric current that backwashes that satisfies fan again is not more than rated current, and it is long in order to avoid its caloric value is excessive to guarantee also that simultaneously triode is operated in time of linear zone.
The above, only be the preferred embodiment of the present invention aspect cost and implementation, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention is to any simple modification, equivalent variations and modification that above embodiment did, for example by increasing the complicated circuit that components and parts obtain, so long as its equivalent electric circuit or basic function are similar, all still belong in the scope of technical solution of the present invention.
Claims (1)
1, a kind of circuit of eliminating the speed-regulating fan vibrating noise, control the time that the excitation winding of fan stator is energized by the pulse width signal of the anodal maximum voltage of modulation DC fan, it is characterized in that: utilize the control of standard triode to provide suitable current to fan; Utilize the increment rate of resistance-capacitance circuit control stator current; Utilize the counter voltage of diode control fan induction, wherein
Above-mentioned utilizing the control of standard triode to provide suitable current to fan, is that the collector electrode with the standard triode is connected the grounded emitter of this standard triode with the negative pole of controlled DC fan; The above-mentioned increment rate of utilizing resistance-capacitance circuit control stator current, be between the base stage of pulse-width signal incoming line and standard triode, to add a resistance, between pulse-width signal incoming line and control positive source, add a resistance, between the base stage of standard triode and collector electrode, be connected an electric capacity; The above-mentioned counter voltage of utilizing the induction of diode control fan, be DC fan just/negative the two poles of the earth on diode in parallel, the negative electrode of diode connects the positive pole of DC fan, the anode of diode connects the negative pole of DC fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03119467 CN1298104C (en) | 2003-03-13 | 2003-03-13 | Circuit for eliminating shock noise of speed-adjustable fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03119467 CN1298104C (en) | 2003-03-13 | 2003-03-13 | Circuit for eliminating shock noise of speed-adjustable fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1531184A CN1531184A (en) | 2004-09-22 |
| CN1298104C true CN1298104C (en) | 2007-01-31 |
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ID=34285113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03119467 Expired - Fee Related CN1298104C (en) | 2003-03-13 | 2003-03-13 | Circuit for eliminating shock noise of speed-adjustable fan |
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| CN (1) | CN1298104C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100543629C (en) * | 2007-10-29 | 2009-09-23 | 中兴通讯股份有限公司 | A kind of speed-controlling device and the three terminal fan that utilizes this device control speed |
| CN101498321B (en) * | 2008-02-02 | 2011-05-18 | 奇鋐科技股份有限公司 | Noise abatement system of fan |
| CN102207098A (en) * | 2010-03-30 | 2011-10-05 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
-
2003
- 2003-03-13 CN CN 03119467 patent/CN1298104C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1531184A (en) | 2004-09-22 |
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