CN100403202C - Fan rotating speed controlling method and apparatus - Google Patents
Fan rotating speed controlling method and apparatus Download PDFInfo
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- CN100403202C CN100403202C CNB031440630A CN03144063A CN100403202C CN 100403202 C CN100403202 C CN 100403202C CN B031440630 A CNB031440630 A CN B031440630A CN 03144063 A CN03144063 A CN 03144063A CN 100403202 C CN100403202 C CN 100403202C
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- fan
- circuit
- pulse width
- rotation speed
- width modulator
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Abstract
The present invention discloses a fan rotation speed control method. The method comprises the steps: a pulse width modulator outputs at least two paths of pulse width modulation signals according to control parameters and multipath of temperature detection signals; the two paths of pulse width modulation signals are converted into direct current level signals; each path of direct current level signal respectively control the output voltage of a drive circuit; the fan rotation speed is controlled by the output voltage of the drive circuit. The present invention discloses a fan rotation speed control device simultaneously. The present invention is used as an air cooler which can greatly improve the working reliability.
Description
Technical field
The present invention relates to the fan control technology, refer to a kind of fan rotational frequency control method and device especially.
Background technology
At present, a lot of air-cooled equipment mostly adopt the method according to equipment or environment temperature adjusting rotation speed of the fan in order to satisfy noise requirements and to prolong fan life.
Owing to the easy-to-use and reliable preferred option that becomes most of electronic product of brush DC fan, this kind fan is carried out rotating speed control two kinds of methods commonly used: pulse-length modulation (PWM) speed governing and linear voltage regulation speed governing.Range of application is less owing to used the restriction of fan (the fan rated current can not surpass 300mA) and fault detect difficulty in the PWM speed governing; The linear voltage regulation speed governing then may be used on any one two lines brush DC fan.So, adopt the design of linear voltage regulation speed regulating control rotation speed of the fan to adopt the fan control special chip to add the linear circuit formation of adjusting mostly at present, as shown in Figure 1.
Pulse width modulator FAN_IC is the fan control special chip among the figure.The principle of work of this scheme is as follows:
1, the temperature sensor output voltage changes with variation of ambient temperature, and this change in voltage is passed to the fan control chip.
2, the fan control chip calculates current temperature value according to the output voltage of sensor, and exports the pwm signal of duty ratio corresponding under this temperature according to the fan speed control curve of built-in chip type.
3, pwm signal after filtration wave circuit be the dc level signal that level value changes with the shift pulse signal of change in duty cycle.
4, dc level signal is used for controlling the metal-oxide-semiconductor both end voltage again, thereby realizes adjusting the fan both end voltage, promptly adjusts the purpose of rotation speed of the fan.
5, the fan alarm signal is aggregated into the fan control chip with certain logical relation combination, and the fan control chip can detect the stall fault alarm signal of fan.
Central processing unit passes through I
2C interface and fan control partly communicate, and parameter is set and reads warning information etc.
Though the prior art scheme can be adjusted the rotating speed of fan according to environment temperature, has following problem:
1, when the temperature sensor damage, fan control system causes total system temperature anomaly owing to there not being temperature feedback signal to make the undesired or stall of fan running, will burn device and veneer when serious.
2, when the fan control chip failure, when output pwm signal is unusual, as export full low signal, all fan will stop operating, and cause system temperature too high, and veneer burns.
3, when the driven MOS pipe damages, can make whole fan stalls equally, cause system temperature too high, veneer burns.
From on can find out that there is the low shortcoming of functional reliability in the prior art scheme.
Summary of the invention
The invention provides a kind of fan rotational frequency control method and device, to solve the existing low shortcoming of control technology reliability, to improve the reliability of control system.
For addressing the above problem, the invention provides following technical scheme:
A kind of fan rotational frequency control method comprises the steps:
A, pulse width modulator according to controlled variable and at least the two-way temperature detection signal export two-way pulse width modulating signal at least;
B, be converted to dc level signal to major general's two-way pulse width modulating signal;
C, by every road direct current signal output voltage of control Driver Circuit respectively; And
D, by the output voltage of described driving circuit control rotation speed of the fan.
A kind of fan rotation speed control apparatus comprises:
Microprocessor, the pulse width modulator that is connected with microprocessor by bus, temperature sensor and the filtering circuit that is connected with output terminal with the input end of pulse width modulator respectively, the driving circuit that is connected with the filtering circuit output terminal, this driving circuit control fan, it is characterized in that: described temperature sensor is at least two, described pulse width modulator has at least two pulse-width signal output terminals, at least wherein two pulse-width signal output terminals are connected with described filtering circuit, and each filtering circuit is connected with described driving circuit.
According to above-mentioned control device:
The pulse-width signal output terminal of described pulse width modulator also is provided with a supervisory circuit, and this supervisory circuit detected when pulse width modulator loses efficacy and makes fan operate in full-speed state.
The output terminal of described filtering circuit also is provided with clamping circuit, and this clamping circuit carries out clamper to described direct current signal, makes the output voltage of driving circuit be not less than the value of setting.
Described every road filtering circuit is connected with a plurality of driving circuits.
Described driving circuit is a metal-oxide-semiconductor.
Said apparatus also comprise a plurality of fans and be connected in fan and pulse width modulator between the fault warning circuit; Described a plurality of fan is divided into many groups equably, and each group is electrically connected with one drive circuit.
The present invention has following advantage:
1, when single temperature sensor damages, can steering logic not caused confusion, cause the system failure because of environment temperature can't detect.
2, when losing efficacy, can not cause the fan specific control chip Yin Wendu of system too high and damage.
3, when single driven MOS pipe damages, can not make system temperature too high and damage because of the stall of indivedual fans.
Description of drawings
Fig. 1 is the structured flowchart of fan speed-regulating in the prior art;
Fig. 2 is a structured flowchart of the present invention;
Fig. 3 is fan grouping synoptic diagram of the present invention;
Embodiment
Consult Fig. 2: pulse width modulator FAN_IC is the fan control special chip.Microprocessor (CPU) passes through I
2The C bus is connected with pulse width modulator, and two temperature sensor T1, T2 are connected with pulse width modulator FAN_IC, and temperature sensor T3 in the pulse width modulator and temperature sensor T1, T2 joint-detection environment temperature also provide corresponding electric signal to pulse width modulator.Pulse width modulator FAN_IC has two pulse width modulating signal output terminals, and each output terminal is connected with a filtering circuit.This filtering circuit with the pulse signal with certain dutycycle of pulse width modulator FAN_IC output by filtering after the flat signal of output DC.Between the output terminal of pulse width modulator FAN_IC and filtering circuit, be connected a supervisory circuit.This supervisory circuit is monitored pulse-length modulation (PWM) signal of fan control chip output in real time.The output terminal of each filtering circuit connects two driving circuits, and driving circuit is a metal-oxide-semiconductor in the present embodiment.Each driving circuit connects one group of fan, is connected a clamping circuit between filtering circuit and driving circuit, and this clamping circuit makes the output voltage of driving circuit be not less than setting value.Between fan and pulse width modulator, be connected a fault warning circuit, be used to stall that detects by fan etc.
Consult shown in Figure 3, the space structure that a plurality of fans in the system dispel the heat as required is divided into several groups equably, with 8 fans is example, and it is four groups that fan 1-1 and 1-2, fan 2-1 and 2-2, fan 3-1 and 3-2, fan 4-1 and 4-2 are divided into, and each driving circuit is controlled one group of fan.When a driving circuit (metal-oxide-semiconductor) damaged, the one group of fan stall that causes was minimum to the system radiating influence.
Principle of work of the present invention:
Microprocessor (CPU) is provided with the fan control parameter, and pulse width modulator is according to pulse-length modulation (PWM) signal of the corresponding dutycycle of environment temperature output two-way of controlled variable and three temperature sensor detections.A plurality of temperature sensors can be realized the backup use of temperature detection, when one of them temperature sensor breaks down, switch to by another sensor control rotation speed of the fan.
The two-way pwm signal passes through the flat signal of output DC after the filtering respectively, 2 metal-oxide-semiconductors of every road dc level signal control, and each metal-oxide-semiconductor drives a plurality of fans.Adopt 2 road pwm signals to drive 4 metal-oxide-semiconductor modes, when single channel PWM damage, single metal-oxide-semiconductor can not cause systemic breakdown when damaging.
Supervisory circuit is monitored the pwm signal of fan control chip output in real time, when pwm signal just often, supervisory circuit is failure to actuate, when the fan control chip failure, be that output pwm signal is not when having rising edge or negative edge, supervisory circuit output high level signal makes fan operate in full-speed state, to guarantee that system can not damage because of overheated under the situation of fan control chip failure.
The effect of clamping circuit is to make the voltage of control metal-oxide-semiconductor be not less than setting value, and when this DC voltage was lower than the magnitude of voltage of hardware setting, clamping circuit action maintained setting value with voltage, guaranteed fan with certain rotational speed, the system that the keeps requirement of dispelling the heat substantially.Clamping circuit makes system works more reliable, still can keep the basic heat sinking function of system under the situation of no PWM output and supervisory circuit inefficacy.
The fan alarm signal is divided into two groups, and the fan control chip can detect the stall fault alarm signal of fan.When arbitrary fan stall, pulse width modulator all can reflect failure message, in time notifies central processor CPU to carry out fault warning.
In invention, the pulse width modulating signal of pulse width modulator output is not limited to two-way, can suitably increase as required.
Claims (11)
1. a fan rotational frequency control method is characterized in that, comprises the steps:
A, pulse width modulator according to controlled variable and at least the two-way temperature detection signal export two-way pulse width modulating signal at least;
B, be converted to dc level signal to major general's two-way pulse width modulating signal;
C, by every road direct current signal output voltage of control Driver Circuit respectively; And
D, by the output voltage of described driving circuit control rotation speed of the fan.
2. the method for claim 1, it is characterized in that: when pulse width modulator lost efficacy, a supervisory circuit made fan work in full-speed state.
3. the method for claim 1 is characterized in that: described direct current signal is carried out clamper, make the output voltage of driving circuit be not less than the value of setting, to guarantee that fan all the time can be with certain rotational speed.
4. the method for claim 1, it is characterized in that: every road direct current signal is controlled two driving circuits at least.
5. as the described method of one of claim 1 to 4, it is characterized in that: each driving circuit is controlled a plurality of fans.
6. fan rotation speed control apparatus, comprise microprocessor, the pulse width modulator that is connected with microprocessor by bus, temperature sensor and the filtering circuit that is connected with output terminal with the input end of pulse width modulator respectively, the driving circuit that is connected with the filtering circuit output terminal, this driving circuit control fan, it is characterized in that: described temperature sensor is at least two, described pulse width modulator has at least two pulse-width signal output terminals, at least wherein two pulse-width signal output terminals are connected with described filtering circuit, and each filtering circuit is connected with described driving circuit.
7. fan rotation speed control apparatus as claimed in claim 6 is characterized in that: the pulse-width signal output terminal of described pulse width modulator also is provided with a supervisory circuit, and this supervisory circuit detected when pulse width modulator loses efficacy and makes fan operate in full-speed state.
8. fan rotation speed control apparatus as claimed in claim 7 is characterized in that: the output terminal of described filtering circuit also is provided with clamping circuit, and this clamping circuit carries out clamper to described direct current signal, makes the output voltage of driving circuit be not less than the value of setting.
9. fan rotation speed control apparatus as claimed in claim 6 is characterized in that: described each filtering circuit is connected with a plurality of driving circuits.
10. as the described fan rotation speed control apparatus of one of claim 6 to 9, it is characterized in that: described driving circuit is a metal-oxide-semiconductor.
11. fan rotation speed control apparatus as claimed in claim 10 is characterized in that: also comprise a plurality of fans and be connected in fan and pulse width modulator between the fault warning circuit; Described a plurality of fan is divided into many groups equably, and each group is electrically connected with one drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031440630A CN100403202C (en) | 2003-07-28 | 2003-07-28 | Fan rotating speed controlling method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031440630A CN100403202C (en) | 2003-07-28 | 2003-07-28 | Fan rotating speed controlling method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1577201A CN1577201A (en) | 2005-02-09 |
| CN100403202C true CN100403202C (en) | 2008-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031440630A Expired - Lifetime CN100403202C (en) | 2003-07-28 | 2003-07-28 | Fan rotating speed controlling method and apparatus |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354047B (en) * | 2007-07-25 | 2011-04-06 | 台达电子工业股份有限公司 | Fan system |
| CN101684823B (en) * | 2008-09-22 | 2012-08-22 | 联想(北京)有限公司 | Controlling device, controlling method and computer for electrical equipment fan |
| CN101710694B (en) * | 2009-11-26 | 2012-12-19 | 上海大学 | Car engine cooling fan blocking/overcurrent protection system and method |
| CN101789751B (en) * | 2010-01-28 | 2013-01-16 | 杭州华三通信技术有限公司 | Speed regulation circuit for fan |
| CN101876320B (en) * | 2010-06-13 | 2014-11-05 | 中兴通讯股份有限公司 | Method and device for controlling fan speed |
| CN101985946B (en) * | 2010-10-22 | 2014-10-29 | 北京星网锐捷网络技术有限公司 | Fan speed-regulation control circuit as well as control method and electronic device thereof |
| CN103488211B (en) * | 2013-08-06 | 2015-09-23 | 奇瑞汽车股份有限公司 | A kind of intelligent machine box temperature control system and method |
| CN104375533A (en) * | 2014-10-28 | 2015-02-25 | 国家电网公司 | Method, device and system for controlling temperature of DC charging post |
| CN106058814B (en) * | 2016-05-24 | 2018-04-24 | 郑州精益达汽车零部件有限公司 | The vehicle-mounted overload protecting circuit for having brush fan and guard method are controlled based on PWM |
| CN106937441B (en) * | 2017-03-07 | 2019-04-19 | 深圳市超频三科技股份有限公司 | A kind of control circuit and luminescence fan component of luminescence fan |
| CN108873794B (en) * | 2018-07-12 | 2021-08-10 | 郑州云海信息技术有限公司 | Control equipment, system and method of cooling fan |
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| JPH07174393A (en) * | 1993-12-17 | 1995-07-14 | Matsushita Electric Ind Co Ltd | Control apparatus for air conditioner |
| CN1258818A (en) * | 1998-12-31 | 2000-07-05 | 神基科技股份有限公司 | Stepless fan speed temperature controller and control method |
| US6089463A (en) * | 1997-06-30 | 2000-07-18 | Ando Electric Co., Ltd. | Cooling system of a semiconductor testing device |
| CN1331402A (en) * | 2000-06-30 | 2002-01-16 | 华为技术有限公司 | Intelligent controller for heat sink of fan |
| CN1412646A (en) * | 2001-10-19 | 2003-04-23 | 联想(北京)有限公司 | Computer temperature control device and method |
| CN1421117A (en) * | 1999-12-23 | 2003-05-28 | 模拟器件公司 | Fan Speed control system |
| US6592449B2 (en) * | 2001-02-24 | 2003-07-15 | International Business Machines Corporation | Smart fan modules and system |
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2003
- 2003-07-28 CN CNB031440630A patent/CN100403202C/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07174393A (en) * | 1993-12-17 | 1995-07-14 | Matsushita Electric Ind Co Ltd | Control apparatus for air conditioner |
| US6089463A (en) * | 1997-06-30 | 2000-07-18 | Ando Electric Co., Ltd. | Cooling system of a semiconductor testing device |
| CN1258818A (en) * | 1998-12-31 | 2000-07-05 | 神基科技股份有限公司 | Stepless fan speed temperature controller and control method |
| CN1421117A (en) * | 1999-12-23 | 2003-05-28 | 模拟器件公司 | Fan Speed control system |
| CN1331402A (en) * | 2000-06-30 | 2002-01-16 | 华为技术有限公司 | Intelligent controller for heat sink of fan |
| US6592449B2 (en) * | 2001-02-24 | 2003-07-15 | International Business Machines Corporation | Smart fan modules and system |
| CN1412646A (en) * | 2001-10-19 | 2003-04-23 | 联想(北京)有限公司 | Computer temperature control device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1577201A (en) | 2005-02-09 |
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