CN100440718C - Speed regulating fan system with fault-tolerant capacity - Google Patents
Speed regulating fan system with fault-tolerant capacity Download PDFInfo
- Publication number
- CN100440718C CN100440718C CNB2005100364009A CN200510036400A CN100440718C CN 100440718 C CN100440718 C CN 100440718C CN B2005100364009 A CNB2005100364009 A CN B2005100364009A CN 200510036400 A CN200510036400 A CN 200510036400A CN 100440718 C CN100440718 C CN 100440718C
- Authority
- CN
- China
- Prior art keywords
- voltage
- signal
- fan
- fault
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
This invention relates to a fan regulation system with an error-tolerance ability including an input voltage testing circuit, a PWM circuit, a switch supply circuit and a fan set, in which, the control signal of rotation speed of the system and tested voltage signal control the output of the PWM waveforms, control the switch devices of a switch supply circuit and output a suitable voltage to the fan set, when the fan is tested to be faulty, the duty ratio of the PWm waveform can be adjusted.
Description
Technical field
The present invention relates to a kind ofly be used to communicate by letter and the fan system of mainframe computer wind-cooling heat dissipating, relate in particular to the fan heat sink of communication equipment.
Background technology
In communication and mainframe computer field, along with the development of technology, the power consumption of equipment has the trend that increases gradually, and the heat dispersion and the reliability thereof of cooling system are had higher requirement.At present, the main heat dissipating method in this field still utilizes radiator fan to carry out active wind-cooling heat dissipating, and in order to obtain better radiating effect, the power of radiator fan also has the trend of increase, and has caused the increase of fan system power consumption and noise.
Traditional fan system, directly by communication system-the 48V power supply powers to fan.Under present technical conditions, some problems that come out gradually comprise:
1, the supply power voltage of fan changes with the supply power voltage of frame, may cause heat radiation bad when supply voltage is low, produces too much power consumption when voltage is high, and produces extra noise;
2, the rotating speed of fan is uncontrolled, may cause heat radiation bad when ambient temperature is high, produces extra power consumption and noise when ambient temperature is low;
3, fan itself comprises mechanical structure, and in the design of fan system should consider the fault-tolerant ability of fan failure much smaller than semiconductor device useful life.Though directly can realize fault-tolerant ability, in all fan operations just often, but produce extra power consumption and noise by increasing extra fan;
In order to address these problems, some improved control method for fan are arranged, traditional fan system is being made the improved while, also bring some shortcomings.Common method as:
1, powers to fan with linear stabilized power supply, but can only control rotating speed like this, reduce noise, can not significantly reduce power consumption; And power consumption is excessive on the voltage conversion device, causes reliability to reduce;
2, use special speed-regulating fan, can remove to control rotation speed of the fan by an extra control signal.Special design (non-Switching Power Supply mode) has been used in this fan inside, the price comparison costliness, and have only minority supplier to produce, there is supply of material risk;
3, use an independent Switching Power Supply to produce the Half Speed voltage that voltage is lower, the power supply of fan can be switched between input supply voltage and Half Speed voltage, but such control mode can not realize the continuous variation of rotation speed of the fan, and it is limited to reduce power consumption and anti noise;
4, use an output voltage adjustable continuously and power to fan by the Switching Power Supply of feedback regulation.Switching Power Supply for an output voltage can be adjusted on a large scale will guarantee steady operation under various output voltages and loading condition, and the difficulty of design and debugging is all bigger, and cost is also high.Not only debugging cycle is long can influence development progress, promptly allows to realize, also inevitably because the influence of feedback circuit has reduced reliability.
5,, judge whether fault of fan, and then it is fault-tolerant that the rotating speed of fan group is adjusted realization by detecting each fan state signal.But when fan failure and status signal do not provide indication (also breaking down), can cause system radiating bad, may cause serious consequence;
6, judge whether fault of fan by detecting each fan consumed current, so to the rotating speed of fan group adjust realize fault-tolerant.Though do like this for the detection of fan failure reliable, but require continuously timing of rotation speed of the fan, fan electrical current can change continuously, need compare accurate detection to fan electrical current and just can judge whether fault, has increased cost.
Summary of the invention
The purpose of this invention is to provide a kind of speed regulating fan system that fault-tolerant ability is arranged, it can overcome the defective of prior art, according to the control signal of system, uses common fan, realizes the rotating speed adjustment of intelligence, significantly reduces the power consumption and the noise of cooling system; Can adapt to different ambient temperatures and supply voltage, fan voltage is made stable control.
The present invention includes input voltage detection circuit, PWM (Pulse Width Modulation, pulse width modulation) control circuit, switching power circuit and fan group; Pwm control circuit is by the speed controling signal and the detected voltage signal control output PWM waveform of system, and the switching device of control switching circuit is exported a suitable voltage and powered to the fan group.And when detecting fan failure, can make certain adjustment to the duty ratio of PWM waveform.
Described input voltage detection circuit can be to constitute (as the MC34161 voltage checking chip of ONSEMI) by 1 or a plurality of special voltage checking chip; Also can be to constitute by general voltage comparator or operational amplifier (as LM324); Can also be to constitute by A/D converter or VFC circuit; Convert voltage signal to level, cycle, frequency, duty ratio or certain data frame signal.
Described rotation speed of the fan control signal can be provided by the Environment Monitor Unit of communication system.
Chip microcontroller is realized or used to described pwm control circuit with programmable logic device.
Compared with prior art, power to fan, realized following progress because the present invention has adopted by the open loop Switching Power Supply of logical circuit control:
Adjustable continuously by fan voltage uses conventional fan can realize that rotating speed is adjustable continuously, significantly reduced the power consumption and the noise of cooling system; Use Switching Power Supply efficiently, and do not had stability problem common on the Switching Power Supply, improved reliability; When having realized fault-tolerant ability, on fan, do not produce extra noise and power consumption.
Description of drawings:
Fig. 1 is a The general frame of the present invention;
Fig. 2 is the V-I performance diagram of BUCK circuit under the PWM of fixed duty cycle Waveform Control;
Fig. 3 is with the example of a voltage detection circuit (by the VFC circuit of LM331 realization);
Fig. 4 is the schematic diagram of the BUCK transducer of negative voltage input commonly used in the communication;
Fig. 5 is the theory diagram by the pwm control circuit of programmable logic device realization.
Embodiment:
Below in conjunction with accompanying drawing enforcement of the present invention is described in further detail.
Fig. 1 is the The general frame of this system.Whole system is by input voltage detection circuit, pwm control circuit, and switching power circuit and fan group constitute.The PWM waveform of pwm control circuit output is controlled by the speed controling signal of system and detected voltage signal, and the switching device of this Waveform Control Switching Power Supply is exported a suitable voltage and powered to the fan group.And when detecting fan failure, can make certain adjustment to the duty ratio of PWM waveform.
Input voltage detection circuit can be with 1 or a plurality of special voltage checking chip formation, as the MC34161 voltage checking chip of ONSEMI; Also can constitute, as LM324 with general voltage comparator or operational amplifier; Can also constitute by A/D converter or VFC circuit.Its purpose is the input power source voltage, converts the signal that pwm control circuit (digital circuit) can be discerned to, and this signal can be level, cycle, frequency, duty ratio even certain Frame.
Fig. 3 is exactly the example of a voltage detecting circuit.It can be converted voltage signal to a frequency signal, and be made retention wire sexual intercourse between voltage and the frequency by a typical VFC (Voltage-Freqence Convter, the voltage-frequency converter) circuit that LM331 forms.Among the figure, V
INBe input voltage, V
SBe the power supply of LM331, V
LOGICDraw power supply on the output frequency signal, f
OUTBe frequency output.In order to allow input voltage range meet the input range of VFC circuit, can do dividing potential drop with resistance earlier, and then carry out the voltage-frequency conversion.
Speed controling signal among Fig. 1 can be provided by the Environment Monitor Unit of communication system.The environment monitoring board of communication system contains CPU and some transducers, and the software of its operation can be exported the signal of a control rotation speed of the fan and give pwm control circuit according to the initial conditions such as power of current working temperature and system.This signal also can be level, cycle, frequency, duty ratio even certain Frame.
Pwm control circuit can realize easily with programmable logic device, as shown in Figure 5; The implementation method that other are also arranged is as single-chip microcomputer etc.Require the speed controling signal that its can provide according to the power supply voltage signal that receives and environment monitoring board, calculate a particular duty cycle D, and the corresponding PWM waveform of output, required voltage obtained with control switching.And can be according to the fan state signal, the duty ratio of PWM is adjusted.
Switching power circuit can be the BUCK transducer of a common open loop, and Fig. 4 is exactly the example of a BUCK transducer, mainly comprises power switch pipe, fly-wheel diode, inductance, compositions such as input and output electric capacity.Its input voltage V bears, and output voltage V _ FAN also bears, and GND is the public ground of input and output voltage.The pwm signal of pwm control circuit output, the switch controlling signal MOS_G of MOS device among the generation figure after overdriving, the break-make of control device.In order to obtain good impedance frequency characteristics, output capacitance is used with electrochemical capacitor and ceramic condenser parallel connection.
The fan group comprises a plurality of fans.Each fan comprises an operating state index signal, generally is to be used for representing the level signal of fault or the frequency signal of expression rotating speed.These status signals output to all to pwm control circuit.
In order to describe operation principle of the present invention, the circuit parameter that at first defines the BUCK power supply changeover device is as follows:
The T switch periods;
T
ONThe switch conduction time
The duty ratio of D switch, i.e. T
ON/ T
I exports average current
V
INInput voltage
V
OUTOutput voltage
The L inductance value
According to the theory of Switching Power Supply, the BUCK transducer has two kinds of operating states, is respectively electric current continuous operation mode and electric current discontinuous conduction mode, and its critical point is
T＊(1-D)＊V
OUT＝2＊I＊L (1)
Electric current is during greater than this critical point, and power supply is in the electric current continuous operation mode, and its output voltage is:
V
OUT＝V
IN＊D (2)
And electric current is during less than this critical point, and power supply is in the electric current discontinuous conduction mode, and its output voltage is:
V
OUT＝T
ON 2＊V
IN 2/(2＊I＊T＊L+T
ON 2＊V
IN)(3)
According to (1), (2), (3) can obtain the output characteristic curve of BUCK transducer under fixed duty cycle, and as shown in Figure 2, its abscissa is represented electric current, and ordinate is represented voltage.
According to the inductance value L of formula (1) design BUCK transducer and the period T of pwm control circuit output waveform, make power supply when fan group fault-free, operating current just greater than electric current continuously/discontinuous critical point.This moment, the output voltage of power supply was determined by formula (2).Can obtain according to formula (2):
D＝V
OUT/V
IN (4)
Wherein, V
INProvide V by voltage detecting circuit
OUTExport to the rotation speed of the fan control signal decision of pwm control circuit by the Environment Monitor Unit of system.Pwm control circuit is just according to the foundation of formula (4) as output pwm signal duty ratio D.
With reference to figure 5, pwm control logic is by the voltage signal receive logic, the tach signal receive logic, and duty ratio computational logic and PWM formation logic are formed.Voltage signal receive logic and tach signal receive logic, be used for receiving voltage and speed controling signal (frequency, duty ratio etc.), and convert it to a value corresponding of logic inside, calculate corresponding duty ratio D according to formula (4) by the duty ratio computational logic.Because too complexity of numerical computations is carried out in logic inside, adopt the mode of tabling look-up to realize.The PWM generative circuit is according to the corresponding PWM waveform of duty ratio D output.
Find out input voltage V easily
INDuring variation, can cause the variation of the voltage signal that measures, pwm control circuit receives after this changes, and can adjust the value of D according to formula (4), to ensure to the V of fan power supply
OUTBasicly stable.Equally, when the rotation speed of the fan control signal of system environments monitoring unit output changed, duty ratio D also can and then change, and adjusted V
OUT, reach the purpose of controlling rotating speed.Obtain after the duty ratio D, the output of PWM waveform is just fairly simple.
Because this Switching Power Supply works under the open loop situations, there is not the Voltage Feedback of output, therefore will never there be the self-excitation equistability problem of power supply.With respect to the circuit that feedback is arranged,,, can ignore fully this shortcoming because fan is lower to the stability requirement of supply power voltage though the stability of output voltage can slightly descend (causing) by the factors such as resistance on the lead.
Because the operating current of fan group under normal condition just greater than electric current continuously/discontinuous critical point, cause can causing power supply to enter the discontinuous operating state of electric current after the electric current of fan group reduces when indivedual fans have fault.At this moment, the output voltage of power supply is determined by formula (3).With reference to figure 2, as can be seen, along with reducing of load current, circuit can progress into the discontinuous operating state of electric current, and the voltage of output can raise.The rotating speed of all the other fans can increase, and remedying the ventilation quantity loss of fault fan, the total ventilation quantity of the system that keeps is basicly stable.
This adjustment process is that Switching Power Supply is finished automatically, and is irrelevant with pwm control circuit.Even the fault fan does not provide unusual status signal, this fault-tolerant mechanism still is effective.
When described system had fan that fault is arranged, its malfunction may be reflected on the status signal.The fan state signal has all outputed to pwm control circuit, and this circuit can detect the fault (status signal level or frequency unusual) of fan.Except fault message according to fan, to send outside the alarm signal of fan, pwm control circuit can also be according to certain algorithm, adjust the duty ratio D of output pwm signal, to improve the rotating speed of fault-free fan, remedy the ventilation quantity loss of fault fan, reach fault-tolerant purpose.
The algorithm that duty ratio D adjusts, basicly stable with the power of keeping the fan group is principle.General, the load characteristic of fan approaches resistance very much.For example, in a system that N fan arranged, after 1 fan damages, according to keeping the basicly stable principle of fan group power:
N＊V
2＝(N-1)＊V
1 2(5)
Obtain easily:
V
1＝(N/(N-1))
1/2＊V (6)
In formula (5) and the formula (6), V represents fan all just often, the output voltage of power supply, V
1Expression behind a fan failure, the output voltage of power supply.
Claims (8)
1, a kind of speed regulating fan system that fault-tolerant ability is arranged comprises input voltage detection circuit, pulse width modulation control circuit, switching power circuit and fan group;
Described input voltage detection circuit is realized the measurement to input supply voltage, and converts the voltage signal that measures to signal that pulse width modulation control circuit can be discerned;
The rotation speed of the fan control signal that described pulse width modulation control circuit provides according to the signal and the system of detected voltage detecting circuit output is calculated and to the pulse width modulated waveform of a scalable duty ratio of switching power circuit output; Accept the status signal that fan is sent, the pulse-width modulated waveform is made certain adjustment;
Described switching power circuit utilizes the pulse width modulated waveform control of pulse width modulation control circuit output, exports an adjustable voltage and supplies with fan, realizes speed governing; Fan hinder for some reason cause power to reduce after, enter the discontinuous operating state of electric current, improve the adjustable voltage of described output automatically.
2, the described speed regulating fan system that fault-tolerant ability is arranged of claim 1, it is characterized in that, described input voltage detection circuit is to be made of in special voltage checking chip, general voltage comparator, general operational amplifier, A/D converter, the voltage-frequency converting circuit at least one.
3, the described speed regulating fan system that fault-tolerant ability is arranged of claim 2 is characterized in that, described special voltage checking chip, general voltage comparator, general operational amplifier are converted to level signal with voltage signal.
4, the described speed regulating fan system that fault-tolerant ability is arranged of claim 2 is characterized in that described A/D converter converts voltage signal to data frame signal.
5, the described speed regulating fan system that fault-tolerant ability is arranged of claim 2 is characterized in that described voltage-frequency converting circuit converts voltage signal to frequency signal.
6, the described speed regulating fan system that fault-tolerant ability is arranged of claim 1 is characterized in that the rotation speed of the fan control signal is provided by the Environment Monitor Unit of communication system.
7, the described speed regulating fan system that fault-tolerant ability is arranged of claim 1 is characterized in that, chip microcontroller is realized or used to described pulse width modulation control circuit with programmable logic device.
8, the described speed regulating fan system that fault-tolerant ability is arranged of claim 7, it is characterized in that, described programmable logic device realizes that pulse width modulation control circuit comprises the voltage signal receive logic, tach signal receive logic, duty ratio computational logic and pulse width modulation formation logic; Voltage signal receive logic and tach signal receive logic are used for receiving voltage and speed controling signal, and convert it to a value corresponding of logic inside, calculate corresponding duty ratio by the duty ratio computational logic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100364009A CN100440718C (en) | 2005-08-09 | 2005-08-09 | Speed regulating fan system with fault-tolerant capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100364009A CN100440718C (en) | 2005-08-09 | 2005-08-09 | Speed regulating fan system with fault-tolerant capacity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1913334A CN1913334A (en) | 2007-02-14 |
| CN100440718C true CN100440718C (en) | 2008-12-03 |
Family
ID=37722145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100364009A Active CN100440718C (en) | 2005-08-09 | 2005-08-09 | Speed regulating fan system with fault-tolerant capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100440718C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2757852C1 (en) * | 2020-09-22 | 2021-10-21 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Converter of voltage of analogue sensor to frequency or duty cycle |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813093B (en) * | 2009-02-25 | 2011-12-28 | 建准电机工业股份有限公司 | Fan with improved rotational speed control module and fan group constituted thereby |
| CN101619729B (en) * | 2009-06-17 | 2012-07-18 | 广东美的电器股份有限公司 | Control method and operation method for optimizing beaten sound of parallel propeller fan systems |
| CN103138534A (en) * | 2011-11-24 | 2013-06-05 | 上海友邦电气(集团)股份有限公司 | Switching power supply capable of automatically regulating rotating speed of cooling fan |
| CN102609322A (en) * | 2012-02-15 | 2012-07-25 | 浪潮电子信息产业股份有限公司 | Computer fan fault tolerance and handling method |
| CN103671180B (en) * | 2012-09-04 | 2016-05-25 | 鸿富锦精密工业（深圳）有限公司 | Circuit for controlling speed of fan |
| CN102900689B (en) * | 2012-11-13 | 2016-02-24 | 上海斐讯数据通信技术有限公司 | A kind of fan speed-regulating alarm system |
| CN104270005B (en) * | 2014-09-24 | 2017-08-18 | 深圳市万拓存储技术有限公司 | A kind of power supply circuit of fan |
| CN104564627A (en) * | 2015-01-07 | 2015-04-29 | 杭州林叶电气自动化有限公司 | Power saving device |
| CN104767439B (en) * | 2015-01-07 | 2017-04-26 | 沙洲职业工学院 | PWM pulse width speed regulation signal setting and fault code feedback circuit |
| CN106383543B (en) * | 2016-11-22 | 2018-01-30 | 亿嘉和科技股份有限公司 | A kind of ON-OFF control circuit and control method |
| US10866006B2 (en) * | 2018-06-25 | 2020-12-15 | Dell Products L.P. | Systems and methods for fan typing and anomaly detection |
| CN108678988A (en) * | 2018-08-27 | 2018-10-19 | 龙城电装（常州）有限公司 | Fan test system |
| CN110221091B (en) * | 2019-06-10 | 2021-05-28 | 合肥工业大学 | Weak signal extraction method for measuring rotating speed of asynchronous motor based on induction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05292791A (en) * | 1992-04-09 | 1993-11-05 | Asia Electron Inc | Failure detector for fan |
| CN1118895A (en) * | 1994-06-30 | 1996-03-20 | 协力计算机股份有限公司 | Control interface for customer replaceable fan unit |
| CN2375031Y (en) * | 1999-04-02 | 2000-04-19 | 点晶科技股份有限公司 | Brushless fan rotary speed control circuit device |
| US20040145838A1 (en) * | 2003-01-28 | 2004-07-29 | Hazelton Lawrence Dean | Method and apparatus for control and fault detection of a remote electrical motor |
| JP2005171907A (en) * | 2003-12-12 | 2005-06-30 | Kyocera Mita Corp | Fan motor control circuit and electronic apparatus using the same |
-
2005
- 2005-08-09 CN CNB2005100364009A patent/CN100440718C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05292791A (en) * | 1992-04-09 | 1993-11-05 | Asia Electron Inc | Failure detector for fan |
| CN1118895A (en) * | 1994-06-30 | 1996-03-20 | 协力计算机股份有限公司 | Control interface for customer replaceable fan unit |
| CN2375031Y (en) * | 1999-04-02 | 2000-04-19 | 点晶科技股份有限公司 | Brushless fan rotary speed control circuit device |
| US20040145838A1 (en) * | 2003-01-28 | 2004-07-29 | Hazelton Lawrence Dean | Method and apparatus for control and fault detection of a remote electrical motor |
| JP2005171907A (en) * | 2003-12-12 | 2005-06-30 | Kyocera Mita Corp | Fan motor control circuit and electronic apparatus using the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2757852C1 (en) * | 2020-09-22 | 2021-10-21 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Converter of voltage of analogue sensor to frequency or duty cycle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1913334A (en) | 2007-02-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100440718C (en) | Speed regulating fan system with fault-tolerant capacity | |
| WO2009046533A1 (en) | Autonomous hybrid renewable energy controller | |
| CN110703898A (en) | Dynamic management system and method for processor power consumption based on periodic query and interrupt | |
| WO2021233318A1 (en) | Passive cms equalization circuit and method based on super-capacitor | |
| CN202815646U (en) | Intelligent power supply control device for data communication chip and communication equipment | |
| TW201314404A (en) | Energy adjusting method | |
| CN105529944A (en) | Power adapter and electronic system using same | |
| US20240063654A1 (en) | Photovoltaic energy storage system, power system, and high-voltage ride-through control method | |
| CN102486494A (en) | Thermoelectric power consumption detection device and method | |
| US6580623B1 (en) | Flexible converter routing apparatus, system and method | |
| US5525913A (en) | Power validation tool for microprocessor systems | |
| CN103807199A (en) | Fan control circuit | |
| CN101888188B (en) | Apparatus and method for controlling power converter | |
| CN201562223U (en) | Server system | |
| CN203655678U (en) | Fan speed regulating circuit, cooling device and household electric appliance | |
| CN111983301B (en) | Solid state disk testing arrangement | |
| US6700807B1 (en) | Flexible converter | |
| CN1979442A (en) | Monitoring device for operation of hardware element | |
| CN207743867U (en) | Self-lock protection switching controller for electric vehicle | |
| CN202617059U (en) | Off-grid intelligent type fan controller | |
| CN2828890Y (en) | Fan speed regulating control circuit | |
| CN111190469A (en) | Intelligent frequency conversion system | |
| CN206144834U (en) | Electricity fan control circuit | |
| CN203717403U (en) | Simple temperature control fan control circuit | |
| CN219871525U (en) | Overcurrent detection circuit structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |