CN102444602A - Fan rotational speed control device - Google Patents
Fan rotational speed control device Download PDFInfo
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- CN102444602A CN102444602A CN2010105042303A CN201010504230A CN102444602A CN 102444602 A CN102444602 A CN 102444602A CN 2010105042303 A CN2010105042303 A CN 2010105042303A CN 201010504230 A CN201010504230 A CN 201010504230A CN 102444602 A CN102444602 A CN 102444602A
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- fan
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Abstract
A fan rotational speed control device includes a reference voltage generating circuit, a first voltage generating circuit, a second voltage generating circuit and a compensation control circuit, wherein the reference voltage generating circuit is used for receiving a PWM (pulse width modulation) signal and outputting a reference voltage signal; the first voltage generating circuit is used for receiving a PWM signal and generating a first voltage signal as per the PWM signal; the second voltage generating circuit is used for receiving a fan rotational speed signal and generating a second voltage signal as per the fan rotational speed signal; and the compensation control circuit is used for outputting a voltage difference compensation signal as per the first and the second voltage signals. Therefore, the fan rotational speed control device disclosed by the invention provides the stable rotational speed.
Description
Technical field
The present invention relates to a kind of control gear, particularly relate to a kind of fan rotation speed control apparatus.
Background technique
Fan can be used to provide heat radiation, no matter be to be applied to electrical products interior working life and cleanliness with the prolongation product, or reduces the temperature of environment, and at present, fan has been one of the indispensable electronic product of living now.
Present existing fan is mostly by pulse duration modulation (Pulse Width Modulation; PWM) signal is controlled the speed of rotation speed of the fan; Control switching member (for example transistor) conducting and ratio of closing (ON-OFF) in the unit time with the responsibility cycle (Duty Cycle) of waveform; With the size of current of control load, and, need not change the voltage of fan input directly to control rotation speed of the fan by small-signal mode.As shown in Figure 1, it is the schematic representation of existing fan rotation speed control apparatus 1, and it provides a supply voltage V1 to fan rotation speed control apparatus 1 by the outside; With 1 start of drive fan revolution speed control device; In addition, a PWM signal S1 inputs to control circuit 11, with the rotating speed of control fan motor 7.
But existing fan rotation speed control apparatus is easy because the change of external input voltage or instability and air impedance are different, and causes fan under the responsibility cycle (PWM duty cycle) of same pulse width modulation, and rotating speed but changes to some extent.Therefore, how a kind of fan rotation speed control apparatus that stabilized (steady-state) speed is provided and is difficult for receiving the influence of vapour lock is provided, real one of the current important topic that belongs to.
Summary of the invention
Because above-mentioned problem, the object of the invention is that a kind of fan rotation speed control apparatus that stabilized (steady-state) speed is provided is provided.
For realizing above-mentioned purpose, the present invention provides a kind of fan rotation speed control apparatus, and it comprises a reference voltage generating circuit, one first voltage generation circuit, one second voltage generation circuit and a compensation control circuit.Reference voltage generating circuit receives a PWM signal, and exports a reference potential signal; First voltage generation circuit and reference voltage generating circuit electrically connect, and first voltage generation circuit receives the PWM signal, and produces one first voltage signal according to this; Second voltage generation circuit receives a rotation speed of the fan signal, and produces one second voltage signal according to this; The compensation control circuit and first voltage generation circuit and second voltage generation circuit electrically connect, and export a voltage difference compensating signature according to first voltage signal and second voltage signal.
In one embodiment of the invention, wherein compensation control circuit has an operational amplifier, and it is according to first voltage signal and second voltage signal, to export a voltage amplification signal.
In one embodiment of the invention, fan rotation speed control apparatus also comprises a control circuit, electrically connects with reference voltage generating circuit and compensation control circuit, and exports rotating speed adjustment signal according to reference potential signal and voltage difference compensating signature.
In one embodiment of the invention, fan rotation speed control apparatus also comprises a rotation speed of the fan sensor circuit, and the rotation speed of the fan signal is transferred to second voltage generation circuit.
As stated; Because of foundation a kind of fan rotation speed control apparatus of the present invention; Be that first voltage signal that first voltage generation circuit and second voltage generation circuit are produced is compared with second voltage signal; Judge whether to need compensating rotational speed and export a voltage difference compensating signature with compensation control circuit, compensate in the reference potential signal with the voltage difference compensating signature again, adjust the rotating speed of fan.Therefore, fan rotation speed control apparatus of the present invention can provide motor one stable rotating speed, and rotating speed is difficult for receiving the influence of vapour lock and external voltage change.
Description of drawings
Fig. 1 is the schematic representation of existing fan rotation speed control apparatus;
Fig. 2 is the schematic representation according to a kind of fan rotation speed control apparatus of preferred embodiment of the present invention; And
Fig. 3 is the circuit diagram of the fan rotation speed control apparatus of Fig. 2.
The reference numeral explanation
1,2: fan rotation speed control apparatus
11,25: control circuit
21: reference voltage generating circuit
211,243: transistor
212,222,232,242: resistance
22: the first voltage generation circuits
221,233: electric capacity
23: the second voltage generation circuits
231,241: operational amplifier
24: compensation control circuit
7: motor
F: low-pass filter
S1: PWM signal
S2: reference potential signal
S3: first voltage signal
S4: rotation speed of the fan signal
S5: second voltage signal
S6: voltage difference compensating signature
S7: rotating speed adjustment signal
V1: supply voltage
Embodiment
Below will a kind of fan rotation speed control apparatus according to preferred embodiment of the present invention be described with reference to relevant drawings.
Please with reference to shown in Figure 2, it is the schematic representation according to a kind of fan rotation speed control apparatus of preferred embodiment of the present invention.The fan rotation speed control apparatus 2 of preferred embodiment of the present invention is in order to control the rotating speed of a motor 7.Fan rotation speed control apparatus 2 comprises a reference voltage generating circuit 21, one first voltage generation circuit 22, one second voltage generation circuit 23 and a compensation control circuit 24.
Reference voltage generating circuit 21 receives a PWM signal S1 and exports a reference potential signal S2.If the PWM responsibility cycle of the PWM signal S1 of present embodiment is big more, and then the voltage of reference potential signal S2 is just more little; And if the PWM responsibility cycle of PWM signal S1 is more little, and then the voltage of reference potential signal S2 is just big more.
First voltage generation circuit 22 electrically connects with reference voltage generating circuit 21, and first voltage generation circuit 22 receives PWM signal S1, and converts PWM signal S1 one first voltage signal S3 of direct current into.If the PWM percentage of the PWM signal S1 of present embodiment is big more, and then the voltage of the first voltage signal S3 is also high more; And if the PWM percentage of PWM signal S1 is more little, and then the voltage of the first voltage signal S3 is also low more.
Second voltage generation circuit 23 receives a rotation speed of the fan signal S4, and produces one second voltage signal S5 according to this.Rotating speed when wherein, rotation speed of the fan signal S4 is the fan actual operation.Rotation speed of the fan is fast more, and the magnitude of voltage of the second voltage signal S5 is high more; Rotation speed of the fan is slow more, and the magnitude of voltage of the second voltage signal S5 is low more.
The compensation control circuit 24 and first voltage generation circuit 22 and second voltage generation circuit 23 electrically connect receiving the first voltage signal S3 and the second voltage signal S5, and export a voltage difference compensating signature S6 according to the first voltage signal S3 and the second voltage signal S5.When the first voltage signal S3 and the second voltage signal S5 are inequality, promptly export this voltage difference compensating signature S6, to judge the gap of actual speed and rotating speed of target.
Control circuit 25 electrically connects to receive reference potential signal S2 and voltage difference compensating signature S6 with reference voltage generating circuit 21 and compensation control circuit 24; And benchmark voltage signal S2 and voltage difference compensating signature S6 and export rotating speed adjustment signal S7 to fan motor 7, with the rotating speed of control fan motor 7.
Please with reference to Fig. 3, it is a circuit diagram of the fan rotation speed control apparatus of Fig. 2.Below, the structure and the start of the reference voltage generating circuit of fan rotation speed control apparatus 2 of the present invention 21, first voltage generation circuit 22, second voltage generation circuit 23, compensation control circuit 24 and control circuit 25 are detailed.In addition, structure aspect shown in Figure 3 is an aid illustration, is not in order to restriction the present invention.
Reference voltage generating circuit 21 has a P transistor npn npn or a N transistor npn npn, and the reference voltage generating circuit 21 of present embodiment is to be example to have a N type field-effect transistor 211.The gate terminal of transistor 211 receives PWM signal S1, and PWM signal S1 exports a reference potential signal S2 of direct current through behind the transistor 211 and a plurality of resistance 212 dividing potential drops of reference voltage generating circuit 21.If the PWM responsibility cycle of the PWM signal S1 of present embodiment is big more, and then the voltage of reference potential signal S2 is just more little; And if the PWM responsibility cycle of PWM signal S1 is more little, and then the voltage of reference potential signal S2 is just big more.
First voltage generation circuit 22 electrically connects with reference voltage generating circuit 21, and first voltage generation circuit 22 has an electric capacity 221 and a plurality of resistance 222.First voltage generation circuit 22 receives PWM signal S1, and produces one first voltage signal S3 of direct current according to this.If the PWM percentage of the PWM signal S1 of present embodiment is big more, and then the voltage of the first voltage signal S3 is also high more; And if the PWM percentage of PWM signal S1 is more little, and then the voltage of the first voltage signal S3 is just low more.
The fan rotation speed control apparatus of present embodiment also comprises a rotation speed of the fan sensor circuit (figure does not illustrate).The rotation speed of the fan sensor circuit has a rotation speed of the fan sense cell, the rotating speed when recording the fan running with the rotation speed of the fan sense cell, and produce a rotation speed of the fan signal S4 and transfer to second voltage generation circuit 23.Wherein, if desire to record rotating speed according to motor 7, then the rotation speed of the fan sense cell can be a hall sensor or an optical coupler; If desire to record rotating speed according to flabellum, then the rotation speed of the fan sense cell can be a tacho.In addition, the waveform of rotation speed of the fan signal S4 can be square wave or string ripple.The cycle of rotation speed of the fan signal S4 is for fixing, and the amplitude size of rotation speed of the fan signal S4 is decided according to rotating speed.
Second voltage generation circuit 23 has a low-pass filter F, is used to receive rotation speed of the fan signal S4, and low-pass filter F comprises an operational amplifier 231, a resistance 232 and an electric capacity 233, and operational amplifier 231, resistance 232 and electric capacity 233 are parallel with one another.Wherein, the reverse input end of operational amplifier 231 receives rotation speed of the fan signal S4.The reverse input end and the output terminal of resistance 232 and electric capacity 233 concatenation operation amplifiers 231, rotation speed of the fan signal S4 makes second voltage generation circuit 23 can produce one second voltage signal S5 of direct current after low-pass filter F and 232 conversions of a plurality of resistance.If the rotating speed of the rotation speed of the fan signal S4 of present embodiment is fast more, and then the second voltage signal S5 is also high more; And if the rotating speed of rotation speed of the fan signal S4 is slow more, and then the second voltage signal S5 is also just low more.
Compensation control circuit 24 has an operational amplifier 241, a plurality of resistance 242 and a transistor 243, and wherein transistor 243 can be a N transistor npn npn or P transistor npn npn, in present embodiment, is to be example with the N transistor npn npn.A plurality of resistance 242 link the input end of operational amplifier 241, and a resistance 242 wherein links the output terminal of operational amplifier 241 and the base terminal of transistor 243.The compensation control circuit 24 and first voltage generation circuit 22 and second voltage generation circuit 23 electrically connect; And receive the first voltage signal S3 and the second voltage signal S5; The first voltage signal S3 and the second voltage signal S5 transfer to the non-inverting input and the reverse input end of operational amplifier 241 respectively; Operational amplifier 241 amplifies the voltage difference of the first voltage signal S3 and the second voltage signal S5; And export a voltage difference by output terminal and amplify signal and be sent to transistor 243, transistor 243 amplifies signal according to voltage difference and exports a voltage difference compensating signature S6.When the first voltage signal S3 was identical with the second voltage signal S5, then compensation control circuit 24 can output voltage difference compensating signature S6; And when the first voltage signal S3 and the second voltage signal S5 were inequality, compensation control circuit 24 was with output voltage difference compensating signature S6.
The fan rotation speed control apparatus of present embodiment also comprises a control circuit 25; Itself and reference voltage generating circuit 21 and compensation control circuit 24 electrically connect; Receive reference potential signal S2 and voltage difference compensating signature S6 and export rotating speed adjustment signal S7 to fan motor 7, with the rotating speed of control fan motor 7 according to reference potential signal S2 and voltage difference compensating signature S6.Control circuit 25 compares rotating speed adjustment signal S7 with the pyramidal wave of fixed frequency.If the level of rotating speed adjustment signal S7 is lower, capture in the scope of pyramidal wave longlyer, make that then motor 7 rotating speeds are very fast; If the level of rotating speed adjustment signal S7 is higher, capture in the scope of pyramidal wave shortlyer, make that then motor 7 rotating speeds are slower.
In sum; Because of foundation a kind of fan rotation speed control apparatus of the present invention; Be that first voltage signal that first voltage generation circuit and second voltage generation circuit are produced is compared with second voltage signal; Judge whether to need compensating rotational speed and export a voltage difference compensating signature with compensation control circuit, compensate in the reference potential signal with the voltage difference compensating signature again, adjust the rotating speed of fan.Therefore, fan rotation speed control apparatus of the present invention can provide motor one stable rotating speed, and rotating speed is difficult for receiving the influence of vapour lock and external voltage change.
The above is merely for example, but not is restriction.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 (10)
1. fan rotation speed control apparatus comprises:
One reference voltage generating circuit receives a PWM signal, and exports a reference potential signal;
One first voltage generation circuit electrically connects with this reference voltage generating circuit, and this first voltage generation circuit receives this PWM signal, and produces one first voltage signal according to this;
One second voltage generation circuit receives a rotation speed of the fan signal, and produces one second voltage signal according to this; And
One compensation control circuit; Electrically connect with this first voltage generation circuit and this second voltage generation circuit, this compensation control circuit receives this first voltage signal and exports a voltage difference compensating signature with this second voltage signal and according to this first voltage signal and this second voltage signal.
2. fan rotation speed control apparatus as claimed in claim 1, wherein this reference potential signal, this first voltage signal and this second voltage signal are a direct current signal.
3. fan rotation speed control apparatus as claimed in claim 1, wherein this second voltage generation circuit has a low-pass filter, in order to receive this rotation speed of the fan signal.
4. fan rotation speed control apparatus as claimed in claim 3, wherein this low-pass filter comprises an operational amplifier, a resistance and an electric capacity, this operational amplifier, this resistance and this electric capacity are parallel with one another.
5. fan rotation speed control apparatus as claimed in claim 1, wherein this compensation control circuit has an operational amplifier, and this operational amplifier is according to this first voltage signal and this second voltage signal, to export a voltage amplification signal.
6. fan rotation speed control apparatus as claimed in claim 5, wherein this compensation control circuit also has a transistor, and this transistor connects an output terminal of this operational amplifier.
7. fan rotation speed control apparatus as claimed in claim 1; Also comprise a control circuit; Electrically connect with this reference voltage generating circuit and this compensation control circuit, receive this reference potential signal and export the motor that a rotating speed is adjusted signal to a fan with this voltage difference compensating signature and according to this reference potential signal and this voltage difference compensating signature.
8. fan rotation speed control apparatus as claimed in claim 1 also comprises a rotation speed of the fan sensor circuit, and this rotation speed of the fan signal is transferred to this second voltage generation circuit.
9. fan rotation speed control apparatus as claimed in claim 8, wherein this rotation speed of the fan sensor circuit has a rotation speed of the fan sense cell.
10. fan rotation speed control apparatus as claimed in claim 9, wherein this rotation speed of the fan sense cell is a hall sensor or an optical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010504230.3A CN102444602B (en) | 2010-10-11 | 2010-10-11 | Fan rotational speed control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010504230.3A CN102444602B (en) | 2010-10-11 | 2010-10-11 | Fan rotational speed control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102444602A true CN102444602A (en) | 2012-05-09 |
| CN102444602B CN102444602B (en) | 2015-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010504230.3A Active CN102444602B (en) | 2010-10-11 | 2010-10-11 | Fan rotational speed control device |
Country Status (1)
| Country | Link |
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| CN (1) | CN102444602B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104948491A (en) * | 2014-03-28 | 2015-09-30 | 智邦科技股份有限公司 | Control device and control method |
| CN106032806A (en) * | 2015-11-23 | 2016-10-19 | 江门市恒天科技有限公司 | Fan controller |
| CN109306970A (en) * | 2017-07-26 | 2019-02-05 | 茂达电子股份有限公司 | Fan control circuit and fan control method |
| CN109708265A (en) * | 2018-12-20 | 2019-05-03 | 海信（山东）空调有限公司 | The starting method and outdoor unit of blower in a kind of outdoor unit |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4444810A1 (en) * | 1994-12-15 | 1996-06-20 | Eberspaecher J | Control circuit for a blower drive motor |
| TW200427929A (en) * | 2003-04-30 | 2004-12-16 | Fujitsu Siemens Computers Gmbh | Control unit for driving a regulating transistor of a fan arrangement |
| US20080238487A1 (en) * | 2007-03-29 | 2008-10-02 | Andigilog, Inc. | Duty cycle comparator |
| CN101320952A (en) * | 2005-08-11 | 2008-12-10 | 台达电子工业股份有限公司 | Driving device of fan motor |
| US20080310967A1 (en) * | 2007-06-13 | 2008-12-18 | Franz John P | Intelligent air moving apparatus |
| US20090136360A1 (en) * | 2007-11-28 | 2009-05-28 | Young-Chun Jeung | Method of constant airflow control for a ventilation system |
| CN201574959U (en) * | 2009-11-12 | 2010-09-08 | 协禧电机股份有限公司 | Control circuit for rotating speed of fan under multi-mode modulation |
-
2010
- 2010-10-11 CN CN201010504230.3A patent/CN102444602B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4444810A1 (en) * | 1994-12-15 | 1996-06-20 | Eberspaecher J | Control circuit for a blower drive motor |
| TW200427929A (en) * | 2003-04-30 | 2004-12-16 | Fujitsu Siemens Computers Gmbh | Control unit for driving a regulating transistor of a fan arrangement |
| CN101320952A (en) * | 2005-08-11 | 2008-12-10 | 台达电子工业股份有限公司 | Driving device of fan motor |
| US20080238487A1 (en) * | 2007-03-29 | 2008-10-02 | Andigilog, Inc. | Duty cycle comparator |
| US20080310967A1 (en) * | 2007-06-13 | 2008-12-18 | Franz John P | Intelligent air moving apparatus |
| US20090136360A1 (en) * | 2007-11-28 | 2009-05-28 | Young-Chun Jeung | Method of constant airflow control for a ventilation system |
| CN201574959U (en) * | 2009-11-12 | 2010-09-08 | 协禧电机股份有限公司 | Control circuit for rotating speed of fan under multi-mode modulation |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104948491A (en) * | 2014-03-28 | 2015-09-30 | 智邦科技股份有限公司 | Control device and control method |
| CN104948491B (en) * | 2014-03-28 | 2016-11-23 | 智邦科技股份有限公司 | Control device and control method |
| US9732758B2 (en) | 2014-03-28 | 2017-08-15 | Accton Technology Corporation | Control device and control method |
| CN106032806A (en) * | 2015-11-23 | 2016-10-19 | 江门市恒天科技有限公司 | Fan controller |
| CN109306970A (en) * | 2017-07-26 | 2019-02-05 | 茂达电子股份有限公司 | Fan control circuit and fan control method |
| CN109708265A (en) * | 2018-12-20 | 2019-05-03 | 海信（山东）空调有限公司 | The starting method and outdoor unit of blower in a kind of outdoor unit |
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| Publication number | Publication date |
|---|---|
| CN102444602B (en) | 2015-05-13 |
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