CN102468793A - Fan rotating speed control device - Google Patents
Fan rotating speed control device Download PDFInfo
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- CN102468793A CN102468793A CN2010105479546A CN201010547954A CN102468793A CN 102468793 A CN102468793 A CN 102468793A CN 2010105479546 A CN2010105479546 A CN 2010105479546A CN 201010547954 A CN201010547954 A CN 201010547954A CN 102468793 A CN102468793 A CN 102468793A
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- signal
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- width modulation
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Abstract
The invention relates to a fan rotating speed control device which comprises a first signal generating circuit, a second signal generating circuit, a pulse width modulation circuit and a switching circuit, wherein the first signal generating circuit is used for receiving a real frequency signal and a target frequency signal and generating a first signal according to the real frequency signal and the target frequency signal; the second signal generating circuit is used for generating a second signal according to the first signal; the pulse width modulation circuit is used for generating a pulse width modulation signal according to the second signal; and the switching circuit is electrically connected with the pulse width modulation circuit and is used for outputting a control signal so as to control the rotating speed of a motor. Therefore, the stability and the accuracy of the rotating speed can be improved by the fan rotating speed control device.
Description
Technical field
The present invention relates to a kind of fan rotation speed control apparatus, particularly relate to a kind of fan rotation speed control apparatus of brushless DC fan.
Background technology
The driving mechanism of present brushless DC fan; Mainly be after the winding coil energising of stator; Cooperate Hall sensor (Hall sensor) to judge the position of magnetic pole of permanent magnet rotor; Switching stream, is rotated and the repulsive permanent magnet rotor is lasting to produce alternating magnetic field through the sense of current of the winding coil of stator.In addition, about the rotating speed control technology of fan motor, (Pulse WidthModulation, PWM) technology is the most common with pulse width modulation.
Please with reference to shown in Figure 1, existing fan rotation speed control apparatus 1 is in order to controlling the rotating speed of a motor 7, and fan rotation speed control apparatus 1 has a rotating speed voltage conversion circuit 11, control circuit 12, pulse-width modulation circuit 13 and commutation circuit 14.Rotating speed voltage conversion circuit 11 receives a rotary speed signal S1, the rotating speed when rotary speed signal S1 is motor 7 runnings, and rotating speed voltage conversion circuit 11 converts rotary speed signal S1 into a voltage signal S2, and transfers to control circuit 12.Control circuit 12 has a PID (PID) controller, and control circuit 12 receives a voltage signal S2 and a target voltage signal S3, and with after voltage signal S2 and the target voltage signal S3 computing, exports a signal S4.Pulse-width modulation circuit 13 is according to signal S4 and a fundamental frequency signal S5 and produce a pulse-width modulation signal S6.Commutation circuit 14 makes commutation circuit 14 outputs one controlling signal S7 control the rotating speed of motor 7 with the switch that pulse-width modulation signal S6 controls a plurality of switch elements.
The constant speed control method of existing motor; For example, above-mentioned proportional integral derivative is controlled or the programmable integrated circuit s operation control ... etc., all can make motor reach constant speed drive; But can't precisely control the rotating speed of motor, and existing control method has and is difficult for adjustment and expensive problem.
Therefore, how to provide a kind of easy circuit design to reduce production costs and to improve the stability of rotating speed and the fan rotation speed control apparatus of precision, real one of the current important topic that belongs to.
Summary of the invention
Because above-mentioned problem, the object of the invention is stability and the precision that provides a kind of fan rotation speed control apparatus can improve rotating speed.
For realizing above-mentioned purpose, the present invention provides a kind of fan rotation speed control apparatus, and it comprises one first signal generating circuit, one second signal generating circuit, a pulse-width modulation circuit and a switching circuit.First signal generating circuit receives a real frequency signal and a target frequency signal, and produces one first signal according to this; Second signal generating circuit and first signal generating circuit electrically connect, and second signal generating circuit produces one second signal according to first signal; The pulse-width modulation circuit and second signal generating circuit electrically connect, and produce a pulse-width modulation signal according to second signal; Commutation circuit and pulse-width modulation circuit electrically connect, and export a controlling signal, with the rotating speed of control motor.
In one embodiment of the invention, second signal generating circuit has a filter, and it receives first signal, and first signal is filtered into second signal of direct current.
In one embodiment of the invention, commutation circuit has a H type electric bridge.
In one embodiment of the invention, fan rotation speed control apparatus also comprises an integrated circuit, and itself and first signal generating circuit and commutation circuit electrically connect.
In one embodiment of the invention, integrated circuit has a signal converter, and it receives an outside pulse-width modulation signal, and produces the target frequency signal according to this.
In one embodiment of the invention, integrated circuit has an oscillator, and oscillator is exported a square-wave signal.
In one embodiment of the invention, fan rotation speed control apparatus also comprises a waveform changing circuit, and itself and integrated circuit and pulse-width modulation circuit electrically connect, and waveform changing circuit receives square-wave signal, and exports one the 3rd signal according to this to pulse-width modulation circuit.
As stated; Because of according to a kind of fan rotation speed control apparatus of the present invention, be to receive the real frequency signal and the target frequency signal of motor operation by first signal generating circuit, and export first signal according to this; Second signal generating circuit is filtered into second signal with first signal; The pulse-width modulation signal is according to second signal and fundamental frequency signal, and generation pulse-width modulation signal, commutation circuit is according to pulse-width modulation signal control H type electric bridge; Again according to the switch output controlling signal of a plurality of switch elements of H type electric bridge, with the rotating speed of control motor.By this, fan rotation speed control apparatus of the present invention can be by the rotating speed of constantly revising motor, to improve the precision and the stability of motor rotary speed.
Description of drawings
Fig. 1 is the sketch map of existing fan rotation speed control apparatus;
Fig. 2 is the sketch map of the fan rotation speed control apparatus of preferred embodiment of the present invention;
Fig. 3 is the sketch map of the fan rotation speed control apparatus of first embodiment of the invention; And
Fig. 4 is the sketch map of the fan rotation speed control apparatus of second embodiment of the invention.
The reference numeral explanation
1,2,3,4: fan rotation speed control apparatus
11: the rotating speed voltage conversion circuit
12: control circuit
13,23: pulse-width modulation circuit
14,24: commutation circuit
21: the first signal generating circuits
22: the second signal generating circuits
25: target frequency produces circuit
26: fundamental frequency produces circuit
27: integrated circuit
271: the control logic device
272: oscillator
273: signal converter
28: waveform changing circuit
7: motor
S1: rotary speed signal
S2: voltage signal
S3: target voltage signal
S4, S22, S27, S32, S36: signal
S5, S15: fundamental frequency signal
S6, S16, S28, S37: pulse-width modulation signal
S7, S17, S29, S38: controlling signal
S11, S21, S31: real frequency signal
S12, S24, S33: target frequency signal
S13, S25, S34: first signal
S14, S26, S35: second signal
S23: outside pulse-width modulation signal
Embodiment
Below will the fan rotation speed control apparatus according to preferred embodiment of the present invention be described with reference to relevant drawings, wherein components identical will be explained with identical reference marks.
Please with reference to shown in Figure 2, the fan rotation speed control apparatus 2 of preferred embodiment of the present invention is in order to controlling the rotating speed of a motor 7, and is the fan rotation speed control apparatus of brushless DC fan.Fan rotation speed control apparatus 2 comprises one first signal generating circuit 21, one second signal generating circuit 22, a pulse-width modulation circuit 23 and and switches circuit 24.In addition, fan rotation speed control apparatus 2 of the present invention is that (Phase Locked Loop, notion PLL) designs with phase lock circuitry for improving the precision and the stability of motor 7 rotating speeds.
The fan rotation speed control apparatus 2 of present embodiment also comprises a rotating speed sensor circuit (figure does not illustrate).The rotating speed sensor circuit has a rotating speed sensing element; Record the rotating speed of motor 7 when operating with the rotating speed sensing element; The rotating speed sensor circuit converts this rotating speed into operating frequency and produces a real frequency signal S11, and transfers to first signal generating circuit 21 and commutation circuit 24.Wherein, the rotating speed sensing element can be a hall sensor or an optical coupler.
First signal generating circuit 21 receives a real frequency signal S11 and a target frequency signal S12; Wherein, The target frequency signal S12 of present embodiment produces circuit 25 via a target frequency and produces and transfer to first signal generating circuit 21, and target frequency signal S12 is the frequency of motor 7 rotating speeds desiring to reach.First signal generating circuit 21 is according to the relative error value of real frequency signal S11 and target frequency signal S12, and produces one first signal S13.
Second signal generating circuit 22 and first signal generating circuit 21 electrically connect, and second signal generating circuit 22 has a filter.Filter receives the first signal S13, and the first signal S13 is filtered into one second signal S14 of direct current.
Fan rotation speed control apparatus 2 also comprises a fundamental frequency and produces circuit 26.Fundamental frequency produces circuit 26 and produces a fundamental frequency signal S15.The fundamental frequency signal S15 of present embodiment is a triangular wave.
The pulse-width modulation circuit 23 and second signal generating circuit 22 and fundamental frequency produce circuit 26 and electrically connect, and produce a pulse-width modulation signal S16 according to the second signal S14 and fundamental frequency signal S15, and transfer to commutation circuit 24.
(Phase Locked Loop, PLL), it is that (Voltage Control Oscillator VCO) forms, and formation one loop circuit that is connected by a frequency/phase detector, a loop filter and a voltage controlled oscillator with phase lock circuitry.First signal generating circuit 21 of present embodiment is equal to the frequency/phase detector, and second signal generating circuit 22 is equal to loop filter, and pulse-width modulation circuit 23, commutation circuit 24 and motor 7 threes are equal to voltage controlled oscillator.
First signal generating circuit 21 receives target frequency signal S12 and will be by the real frequency signal S11 of motor 7 outputs as feedbacking signal; And first signal generating circuit 21 is according to the error of target frequency signal S12 and real frequency signal S11; And produce the first signal S13, again the first signal S13 is transferred to second signal generating circuit 22.Second signal generating circuit 22 via after the filter filtering, produces the second signal S14 of direct current with the first signal S13, and second signal generating circuit 22 inputs to pulse-width modulation circuit 23 with the second signal S14.The second signal S14 output pulse width modulating signal S16 is to commutation circuit 24 for pulse-width modulation circuit 23 foundations, so that the rotating speed of commutation circuit 24 control motors 7.So constantly circulation, the rotating speed of correction motor 7, when real frequency signal S11 equated with target frequency signal S12, then first signal generating circuit 21 can lock the first signal S13, so that motor 7 is kept constant rotating speed.
Above-mentioned is the basic aspect of fan rotation speed control apparatus of the present invention.Below, the variation aspect of the fan rotation speed control apparatus of preferred embodiment of the present invention will be described with two embodiment.
Please with reference to shown in Figure 3, the fan rotation speed control apparatus 3 of first embodiment of the invention comprises one first signal generating circuit 21, one second signal generating circuit 22, a pulse-width modulation circuit 23, and switches a circuit 24 and a rotating speed sensor circuit (figure does not illustrate).In addition, an integrated circuit 27 and a waveform changing circuit 28 in present embodiment, have also been disclosed.Wherein, integrated circuit 27 has a control logic device 271, an oscillator 272 and a signal converter 273.
The rotating speed sensor circuit converts the rotating speed of motor 7 into operating frequency, and produces a real frequency signal S21, and transfers to first signal generating circuit 21 and control logic device 271.
First signal generating circuit 21 receives real frequency signal S21 and target frequency signal S24, and produces one first signal S25 according to real frequency signal S21 and target frequency signal S24.
Second signal generating circuit 22 and first signal generating circuit 21 electrically connect, and second signal generating circuit 22 has a filter.Filter receives the first signal S25, and the first signal S25 is filtered into one second signal S26 of direct current.
The pulse-width modulation circuit 23 and second signal generating circuit 22 and waveform changing circuit 28 electrically connect, and produce a pulse-width modulation signal S28 according to the second signal S26 and signal S27, and transfer to commutation circuit 24.
Please with reference to shown in Figure 4, the fan rotation speed control apparatus 4 of second embodiment of the invention comprises that one first signal generating circuit 21, one second signal generating circuit 22, a pulse-width modulation circuit 23, switch circuit 24, target frequency produces a circuit 25 and a rotating speed sensor circuit (figure does not illustrate).In addition, an integrated circuit 27 and a waveform changing circuit 28 in present embodiment, have also been disclosed.Wherein, integrated circuit 27 has a control logic device 271 and an oscillator 272.
The rotating speed sensor circuit converts the rotating speed of motor 7 into operating frequency, and produces a real frequency signal S31, and transfers to first signal generating circuit 21 and control logic device 271.
Target frequency produces the target frequency signal S33 that circuit 25 produces the rotating speed that motors 7 desire to reach, and target frequency signal S33 is transferred to first signal generating circuit 21.
First signal generating circuit 21 receives real frequency signal S31 and target frequency signal S33, and produces one first signal S34 according to real frequency signal S31 and target frequency signal S33.
Second signal generating circuit 22 and first signal generating circuit 21 electrically connect, and second signal generating circuit 22 has a filter.Filter receives the first signal S34, and the first signal S34 is filtered into one second signal S35 of direct current.
The pulse-width modulation circuit 23 and second signal generating circuit 22 and waveform changing circuit 28 electrically connect, and produce a pulse-width modulation signal S37 according to the second signal S35 and signal S36, and transfer to commutation circuit 24.
In sum; Because of according to a kind of fan rotation speed control apparatus of the present invention, be to receive the real frequency signal and the target frequency signal of motor operation by first signal generating circuit, and export first signal according to this; Second signal generating circuit is filtered into second signal with first signal; The pulse-width modulation signal is according to second signal and fundamental frequency signal, and generation pulse-width modulation signal, commutation circuit is according to pulse-width modulation signal control H type electric bridge; Again according to the switch output controlling signal of a plurality of switch elements of H type electric bridge, with the rotating speed of control motor.By this, fan rotation speed control apparatus of the present invention can be by the rotating speed of constantly revising motor, to improve the precision and the stability of motor rotary speed.
The above is merely and illustrates, 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 (8)
1. fan rotation speed control apparatus, in order to control the rotating speed of a motor, this fan rotation speed control apparatus comprises:
One first signal generating circuit receives a real frequency signal and a target frequency signal, and produces one first signal according to this;
One second signal generating circuit electrically connects with this first signal generating circuit, and this second signal generating circuit produces one second signal according to this first signal;
One pulse-width modulation circuit electrically connects with this second signal generating circuit, and produces a pulse-width modulation signal according to this second signal; And
One switches circuit, electrically connects with this pulse-width modulation circuit, and exports a controlling signal, to control the rotating speed of this motor.
2. fan rotation speed control apparatus as claimed in claim 1, this second signal generating circuit has a filter, and it receives this first signal, and this first signal is filtered into this second signal of a direct current.
3. fan rotation speed control apparatus as claimed in claim 1, this commutation circuit have a H type electric bridge.
4. fan rotation speed control apparatus as claimed in claim 1 also comprises an integrated circuit, and itself and this first signal generating circuit and this commutation circuit electrically connect.
5. fan rotation speed control apparatus as claimed in claim 4, wherein this integrated circuit is a microcontroller, a microprocessor, a programmable gate array or an ASIC element.
6. fan rotation speed control apparatus as claimed in claim 4, wherein this integrated circuit has a signal converter, and it receives an outside pulse-width modulation signal, and produces this target frequency signal according to this.
7. fan rotation speed control apparatus as claimed in claim 4, wherein this integrated circuit has an oscillator, and this oscillator is exported a square-wave signal.
8. fan rotation speed control apparatus as claimed in claim 7; Also comprise a waveform changing circuit; Electrically connect with this integrated circuit and this pulse-width modulation circuit, this waveform changing circuit receives this square-wave signal, and exports one the 3rd signal according to this to this pulse-width modulation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010547954.6A CN102468793B (en) | 2010-11-08 | 2010-11-08 | Fan rotating speed control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010547954.6A CN102468793B (en) | 2010-11-08 | 2010-11-08 | Fan rotating speed control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102468793A true CN102468793A (en) | 2012-05-23 |
| CN102468793B CN102468793B (en) | 2015-04-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010547954.6A Active CN102468793B (en) | 2010-11-08 | 2010-11-08 | Fan rotating speed control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102468793B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423187A (en) * | 2012-05-25 | 2013-12-04 | 鸿富锦精密工业(武汉)有限公司 | Fan speed controlling system |
| CN107666265A (en) * | 2016-07-27 | 2018-02-06 | 株式会社东芝 | Motor control equipment |
| TWI779774B (en) * | 2021-08-16 | 2022-10-01 | 茂達電子股份有限公司 | Rotation locking system of motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030020460A1 (en) * | 2001-07-27 | 2003-01-30 | Chia-Chang Hsu | System for controlling rotational speed of fan |
| US20030062863A1 (en) * | 2001-10-01 | 2003-04-03 | Biing-Huang Huang | Motor speed control circuit having a synchronous PWM signal |
| WO2004086601A1 (en) * | 2003-03-26 | 2004-10-07 | Robert Bosch Gmbh | Method and control circuit for determining an operating state when controlling a fan motor |
| US20080297095A1 (en) * | 2007-06-04 | 2008-12-04 | Ntn Corporation | Drive control circuit for polyphase motor capable of reducing variation among armature currents of respective phases, and spindle apparatus using the same |
-
2010
- 2010-11-08 CN CN201010547954.6A patent/CN102468793B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030020460A1 (en) * | 2001-07-27 | 2003-01-30 | Chia-Chang Hsu | System for controlling rotational speed of fan |
| US20030062863A1 (en) * | 2001-10-01 | 2003-04-03 | Biing-Huang Huang | Motor speed control circuit having a synchronous PWM signal |
| WO2004086601A1 (en) * | 2003-03-26 | 2004-10-07 | Robert Bosch Gmbh | Method and control circuit for determining an operating state when controlling a fan motor |
| US20080297095A1 (en) * | 2007-06-04 | 2008-12-04 | Ntn Corporation | Drive control circuit for polyphase motor capable of reducing variation among armature currents of respective phases, and spindle apparatus using the same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423187A (en) * | 2012-05-25 | 2013-12-04 | 鸿富锦精密工业(武汉)有限公司 | Fan speed controlling system |
| CN107666265A (en) * | 2016-07-27 | 2018-02-06 | 株式会社东芝 | Motor control equipment |
| CN107666265B (en) * | 2016-07-27 | 2020-05-05 | 株式会社东芝 | Motor control device |
| TWI779774B (en) * | 2021-08-16 | 2022-10-01 | 茂達電子股份有限公司 | Rotation locking system of motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102468793B (en) | 2015-04-22 |
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