CN103423184B - A kind of power formula circuit for controlling speed of fan and fan assembly - Google Patents
A kind of power formula circuit for controlling speed of fan and fan assembly Download PDFInfo
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- CN103423184B CN103423184B CN201210149901.8A CN201210149901A CN103423184B CN 103423184 B CN103423184 B CN 103423184B CN 201210149901 A CN201210149901 A CN 201210149901A CN 103423184 B CN103423184 B CN 103423184B
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Abstract
The present invention relates to control circuit field, especially a kind of power formula circuit for controlling speed of fan and fan assembly.The power formula circuit for controlling speed of fan that the present invention provides, by power detecting unit detection by heat abstractor operating power, and controls the rotating speed of fan to control unit, control unit according to this power signal by the power signal output detected.The power formula circuit for controlling speed of fan of present invention offer and fan assembly, owing to directly detecting by the power of heat abstractor, therefore relative to temperature induction type circuit for controlling speed of fan of the prior art, there is the advantages such as control stability is high, error is little, degree of accuracy is high, control is timely.
Description
Technical field
The present invention relates to control circuit field, especially a kind of power formula circuit for controlling speed of fan and fan assembly.
Background technology
General electronic products system host (such as household desk computer) cabinet inside, electronic devices and components run the power consumed
Some comes out with the form of heat, causes the rising of cabinet inside temperature, along with the rising of temperature, can produce electronics
Product cause many harmful effects.Solve this type of temperature problem typically to uprise low in cabinet inside installation with temperature and be automatically adjusted wind
The radiator fan of fan rotating speed speed, is provided with circuit for controlling speed of fan inside this type of radiator fan.
The circuit for controlling speed of fan overwhelming majority uses temperature induction type at present, is and senses by the change of heat sink temperature
Change, when by heat sink temperature more than a particular value, increase rotation speed of the fan, reach to strengthen the effect of heat radiation, and when being dispelled the heat
When unit temp is relatively low, reduce rotation speed of the fan, reduce noise, power consumption to play and extend the effect that fan uses.This type of temperature
The circuit for controlling speed of fan of vicarious, generally uses critesistor as temperature sensitive member.And critesistor is originally as non-
Linear element, causes controlling being difficult to reach linear requirement；And critesistor is easily subject to the shadow of periphery and ambient temperature
Ring and cause the actual temperature state that cannot positively reflect specific part, easily cause the problem that detection is unstable；Additionally
Contact point between accuracy and the article to be measured of critesistor detection is easily by contact area size, relative distance and contact
Position affects；In addition also can there is certain response time in critesistor detection temperature, causes control not in time.In sum,
Control stability is relatively low, error is relatively big, degree of accuracy is the highest, control to use the circuit for controlling speed of fan of critesistor to exist at present
The problem such as not in time.
Summary of the invention
It is an object of the invention to provide a kind of power formula circuit for controlling speed of fan and fan assembly, it is intended to solve existing
, error relatively low with the presence of the circuit for controlling speed of fan control stability in technology is relatively big, degree of accuracy is the highest, control not in time etc.
Problem.
The technical solution used in the present invention is: a kind of power formula circuit for controlling speed of fan, and by heat abstractor and fan
Connect, it is characterised in that including:
Input termination is by heat abstractor, and instant detection is by the power detecting unit of heat abstractor operating power；
Input termination input power, control termination power detector unit outfan, outfan wind-receiving fan, according to power detection
The power signal of unit output controls the control unit of rotation speed of the fan.
Described power detecting unit includes:
Input termination is described by heat abstractor, and instant sensing is described by the power detection electricity of the operating current of heat abstractor
Road；
Input terminates the outfan of described power-sensing circuit, the electric current rectification exported by described power-sensing circuit whole
Current circuit；
Input terminates the outfan of described rectification circuit, filters the filtered electrical of the electric current clutter of described rectification circuit output
Road；
Input terminates the outfan of described filter circuit, and output terminates the control end of described control unit, by described filtering
The electric current of circuit output is converted into the control signal output being suitable to control unit work to the output circuit of control unit.
Described control unit includes audion Q1, audion Q2, resistance R4, resistance R5, diode D5, electric capacity C2；
The positive pole of described diode D5 meets institute as the control outfan of termination power detector unit, the negative pole of control unit
State the base stage of audion Q1；
The emitter stage of described audion Q1 connects first end of described resistance R4, the second end ground connection of described resistance R4, described
The colelctor electrode of audion Q1 connects first end of described resistance R5, and second end of described resistance R5 is as the input of described control unit
Terminate described input power；
The base stage of described audion Q2 connects the colelctor electrode of described audion Q1, emitter stage as the input of described control unit
Terminate described input power, colelctor electrode as described control unit output terminate described fan positive pole；Described fan negative pole
Ground connection；
The first termination base stage of described audion Q1 of described electric capacity C2, the second described input power of termination.
The positive pole of described fan is connected to accessory power supply also by diode D6, and the positive pole of described diode D6 connects auxiliary electricity
Source, the positive pole of negative pole wind-receiving fan.
Described power-sensing circuit is current transformer T1, and the primary coil of described current transformer is examined as described power
Slowdown monitoring circuit input termination described by heat abstractor, the first end of secondary coil and the second end all as described power-sensing circuit
Output terminates described rectification circuit input end.
Described rectification circuit is the bridge rectifier electricity being made up of diode D1, diode D2, diode D3, diode D4
Road；
The positive pole of described diode D1 and the negative pole of described diode D4 all as described rectification circuit input terminate institute
Stating the outfan of power-sensing circuit, the negative pole of described diode D1 terminates described filtered electrical as the output of described rectification circuit
The input on road, the plus earth of described diode D4.
Described filter circuit is an electric capacity C1, and described electric capacity C1 the first end terminates described as the input of described filter circuit
The outfan of rectification circuit, described electric capacity C1 the first end terminate described output circuit simultaneously as the output of described filter circuit
Input, described electric capacity C1 the second end ground connection.
Described output circuit includes resistance R1, resistance R2, resistance R3；
First end of described resistance R1 as described output circuit input termination the outfan of described filter circuit, second
End ground connection；
First termination first end of described resistance R1 of described resistance R2, first end of the second described resistance R3 of termination, institute
State the second end ground connection of resistance R3；
First end of described resistance R3 is as the input of the output described control unit of termination of described output circuit.
A kind of fan assembly, including above-described power formula fan control circuitry.
The power formula circuit for controlling speed of fan that the present invention provides, is worked by heat abstractor by power detecting unit detection
Power, and the power signal output detected is controlled the rotating speed of fan to control unit, control unit according to this power signal.
Power formula circuit for controlling speed of fan that the present invention provides and fan assembly, owing to directly detecting by the power of heat abstractor, because of
This is relative to temperature induction type circuit for controlling speed of fan of the prior art, has that control stability is high, error is little, degree of accuracy
The advantages such as high, control is timely.
Accompanying drawing explanation
The schematic block circuit diagram of the power formula circuit for controlling speed of fan that Fig. 1 provides for the embodiment of the present invention；
The circuit theory diagrams of the power formula circuit for controlling speed of fan that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
For making that the purpose of the present invention, technical scheme and advantage are clearer, understanding, below in conjunction with the accompanying drawings and specific embodiment
The present invention is described in further detail.Should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
The power formula circuit for controlling speed of fan that the present invention provides, is worked by heat abstractor by power detecting unit detection
Power, and the power signal output detected is controlled the rotating speed of fan to control unit, control unit according to this power signal.
Power formula circuit for controlling speed of fan that the present invention provides and fan assembly, owing to directly detecting by the power of heat abstractor, because of
This is relative to temperature induction type circuit for controlling speed of fan of the prior art, has that control stability is high, error is little, degree of accuracy
The advantages such as high, control is timely.
With reference to Fig. 1, the power formula circuit for controlling speed of fan theory diagram that the embodiment of the present invention provides.A kind of power formula wind
Fan rotating-speed control circuit, is connected with by heat abstractor 400 and fan 300, including: input termination, by heat abstractor 400, is examined immediately
Survey by the power detecting unit 100 of heat abstractor 400 operating power；Input termination input power 500, control termination power detection
Unit 100 outfan, outfan wind-receiving fan 300, control 300 turns of fan according to the power signal of power detecting unit 100 output
The control unit 200 of speed.
Power detecting unit 100 includes power-sensing circuit 101, rectification circuit 102, filter circuit 103, output circuit
104.The input termination of power-sensing circuit 101 is by heat abstractor 400, and instant sensing is by the operating current of heat abstractor 400；Whole
The outfan of the input termination power-sensing circuit 101 of current circuit 102, the electric current rectification that power-sensing circuit 101 is exported；Filter
The outfan of the input termination rectification circuit 102 of wave circuit 103, filters the electric current clutter of rectification circuit 102 output；Output circuit
The outfan of the input termination filter circuit 103 of 104, the control end of output termination control unit 200, by defeated for filter circuit 103
The electric current gone out is converted into and is suitable to the control signal output of control unit 200 work to control unit.
The power formula circuit for controlling speed of fan that the present embodiment provides, is detected by power detecting unit 100 and is filled by heat radiation
Putting 400 operating powers, and export the power signal detected to control unit 200, control unit 200 is according to this power signal
Control the rotating speed of fan, relative to temperature induction type circuit for controlling speed of fan of the prior art, have control stability high,
The advantages such as error is little, degree of accuracy is high, control is timely.
With reference to Fig. 2, the circuit theory diagrams of the power formula circuit for controlling speed of fan that the embodiment of the present invention provides.A kind of power
Formula circuit for controlling speed of fan, is connected with by heat abstractor 400 and fan 300, including: input termination is by heat abstractor 400, i.e.
Time detection by the power detecting unit 100 of heat abstractor 400 operating power；Input termination input power 500, control termination power
Detector unit 100 outfan, outfan wind-receiving fan 300, control fan according to the power signal of power detecting unit 100 output
The control unit 200 of 300 rotating speeds.
Power detecting unit 100 includes power-sensing circuit 101, rectification circuit 102, filter circuit 103, output circuit
104.The input termination of power-sensing circuit 101 is by heat abstractor 400, and instant sensing is by the operating current of heat abstractor 400；Whole
The outfan of the input termination power-sensing circuit 101 of current circuit 102, the electric current rectification that power-sensing circuit 101 is exported；Filter
The outfan of the input termination rectification circuit 102 of wave circuit 103, filters the electric current clutter of rectification circuit 102 output；Output circuit
The outfan of the input termination filter circuit 103 of 104, the control end of output termination control unit 200, by defeated for filter circuit 103
The electric current gone out is converted into and is suitable to the control signal output of control unit 200 work to control unit.
As one embodiment of the invention, power-sensing circuit 101 is current transformer T1, the former limit of current transformer 101
Coil is described equal by heat abstractor 400, the first end of secondary coil and the second end as the input termination of power-sensing circuit 101
Described rectification circuit 102 input is terminated as power-sensing circuit 101 output.
As one embodiment of the invention, rectification circuit 102 is by diode D1, diode D2, diode D3, diode D4
The bridge rectifier of composition；The positive pole of diode D1 and the negative pole of diode D4 are all as the input termination of rectification circuit 102
The outfan of power-sensing circuit 101, the negative pole of diode D1 terminates filter circuit 103 as the output of rectification circuit 102
Input, the plus earth of diode D4.
As one embodiment of the invention, filter circuit 103 is an electric capacity C1, and electric capacity C1 the first end is as filter circuit 103
Input termination the outfan of described rectification circuit 102, electric capacity C1 the first end simultaneously as filter circuit 103 output terminate institute
State the input of output circuit 104, electric capacity C1 the second end ground connection.
As one embodiment of the invention, output circuit 104 includes resistance R1, resistance R2, resistance R3.First end of resistance R1
Input the termination outfan of filter circuit 103, the second end ground connection as output circuit 104；First terminating resistor of resistance R2
First end of R1, first end of the second terminating resistor R3, the second end ground connection of resistance R3；First end of resistance R3 is as output electricity
The input of the output termination control unit 200 on road 104.This output circuit is by arranging different resistance R1, resistance R2, resistance
The resistance of R3, can regulate the current potential of output signal.
Control unit 200 includes audion Q1, audion Q2, resistance R4, resistance R5, diode D5, electric capacity C2.Diode
The positive pole of D5 connects the base of audion Q1 as the control outfan of termination power detector unit 100, the negative pole of control unit 200
Pole；First end of the emitter stage connecting resistance R4 of audion Q1, the second end ground connection of resistance R4, the colelctor electrode connecting resistance of audion Q1
First end of R5, second end of resistance R5 terminates input power 500 as the input of control unit 200；The base stage of audion Q2
Connect the colelctor electrode of audion Q1, emitter stage terminates input power 500, colelctor electrode as control as the input of control unit 200
The positive pole of the outfan wind-receiving fan 300 of unit 200；Fan 300 minus earth；The base of the first termination audion Q1 of electric capacity C2
Pole, the second termination input power 500.
The positive pole of fan 300 is connected to accessory power supply Vin ' also by diode D6, and the voltage of this accessory power supply Vin ' is 5V,
The positive pole of diode D6 connects accessory power supply Vin ', the positive pole of negative pole wind-receiving fan 300.
The operation principle of the power formula circuit for controlling speed of fan that the present embodiment provides is:
When system boot, input power 500 changes suddenly, and at this moment C2 is equivalent to short circuit, unidirectional due to diode D5
The character of conducting, therefore input power 500 substantially completely transmits to audion Q1 base stage, now audion Q1 base potential base
Originally being equal to input power 500 current potential, therefore audion Q1 is in saturation, and the current potential of audion Q1 colelctor electrode is pulled low.
Owing to audion Q2 base stage is connected with audion Q1 colelctor electrode, so audion Q2 base stage is also at electronegative potential and is in saturated shape
State.Now, input power 500 is powered to fan 300 through audion Q2, when being in saturation due to audion Q2, its
Penetrate the pressure drop Vce between machine and colelctor electrode the least, additionally, due to the unilateral conduction of diode D6, therefore input power 500
Voltage be substantially loaded onto on fan 300, add the accessory power supply Vin ' of 5V, so now fan 300 is in high rotating speed shape
State.
Change over time, electric capacity C2 slowly recovery characteristics, the current potential of audion Q1 base stage slowly declines, last three poles
Separated by electric capacity C2 between pipe Q1 base stage and input power 500.Now system enters normal operating conditions, power detecting unit
The power-sensing circuit 101 of 100 will detect that, by the electric current of heat abstractor 400, this electric current detected is through rectification circuit
Outputed voltage signal to the input of control unit 200 by output circuit 104 after 102 rectifications, filter circuit 103 filtering, the most defeated
Go out to audion Q1 base stage.
Now rotation speed of the fan will be controlled by by the instant operating power of heat abstractor 400.When power detecting unit 100 detects
Unloaded by heat abstractor 400 or time power is relatively low, the power signal i.e. voltage signal of now power detecting unit 100 output will not
Be enough to make audion Q1 enter conducting state, now audion Q2 is in cut-off state owing to base stage is in high potential, therefore
Now fan 300 is powered by accessory power supply Vin ', is in low speed state, and the most whole circuit is in low noise, energy-conservation shape
State.
When power detecting unit 100 detect by heat abstractor 400 power higher time, now power detecting unit 100 is defeated
The power signal gone out i.e. voltage signal will be greater than the conducting voltage of audion Q1, makes audion Q1 turn on and enter magnifying state,
And then drag down the current potential i.e. current potential of audion Q2 base stage of audion Q1 colelctor electrode, make audion Q2 enter magnifying state, now
Input power 500 is loaded onto on fan 300 by audion Q2.Now fan 300 is by accessory power supply Vin ' and input power 500
Power supply, the input power 500 being wherein loaded onto fan 300 is controlled by by heat abstractor 400 real-time power, when by heat abstractor
When 400 real-time powers are big, the input power 500 being loaded onto on fan 300 is big, otherwise the least, now power formula rotation speed of the fan control
Circuit processed, according to immediately being regulated the rotating speed of fan by the size of heat abstractor 400 operating power, plays good radiating effect.Separately
Outward, owing to using power-sensing circuit 101 to detect accurately by the instant operating power of heat abstractor 400, and rectified current is passed through
Road 102, filter circuit 103, the undelayed transmission of output circuit 104 are to control unit, and therefore this power formula rotation speed of the fan controls
Circuit, relative to temperature induction type circuit for controlling speed of fan of the prior art, has that control stability is high, error is little, accurate
Degree is high, control the advantages such as timely.
Additionally, during system reboot, as described in the operation principle when system boot, fan 300 can high rotating speed
Work certain time, so that it is guaranteed that when system high temperature is restarted can effectively by heat discharge.
The present invention also provides for a kind of fan assembly including power formula circuit for controlling speed of fan described above.
The foregoing is only present pre-ferred embodiments, not in order to limit the present invention, all within the principle of the present invention
Any amendment, equivalent and the improvement etc. made, within should be included in the scope of protection of the invention.
Claims (8)
1. a power formula circuit for controlling speed of fan, is connected with by heat abstractor and fan, it is characterised in that including:
Input termination is by heat abstractor, and instant detection is by the power detecting unit of heat abstractor operating power；
Input termination input power, control termination power detector unit outfan, outfan wind-receiving fan, according to power detecting unit
The power signal of output controls the control unit of rotation speed of the fan；
The positive pole of described fan is connected to accessory power supply also by diode D6, and the positive pole of described diode D6 connects accessory power supply, bears
The positive pole of pole wind-receiving fan；
When electronic product system main frame is started shooting or restarts, fan is jointly powered by input power and accessory power supply, is worked as power
Detector unit detects unloaded by heat abstractor or time power is low, fan is powered by accessory power supply.
Power formula circuit for controlling speed of fan the most according to claim 1, it is characterised in that described power detecting unit bag
Include:
Input termination is described by heat abstractor, the described power-sensing circuit by the operating current of heat abstractor of instant sensing；
Input terminates the outfan of described power-sensing circuit, the rectified current of the electric current rectification exported by described power-sensing circuit
Road；
Input terminates the outfan of described rectification circuit, filters the filter circuit of the electric current clutter of described rectification circuit output；
Input terminates the outfan of described filter circuit, and output terminates the control end of described control unit, by described filter circuit
The electric current of output is converted into the control signal output being suitable to control unit work to the output circuit of control unit.
Power formula circuit for controlling speed of fan the most according to claim 1, it is characterised in that described control unit includes three
Pole pipe Q1, audion Q2, resistance R4, resistance R5, diode D5, electric capacity C2；
The positive pole of described diode D5 connects described three as the control outfan of termination power detector unit, the negative pole of control unit
The base stage of pole pipe Q1；
The emitter stage of described audion Q1 connects first end of described resistance R4, the second end ground connection of described resistance R4, described three poles
The colelctor electrode of pipe Q1 connects first end of described resistance R5, and second end of described resistance R5 terminates as the input of described control unit
Described input power；
The base stage of described audion Q2 connects the colelctor electrode of described audion Q1, emitter stage terminates as the input of described control unit
Described input power, colelctor electrode are as the positive pole of the output described fan of termination of described control unit；Described fan minus earth；
The first termination base stage of described audion Q1 of described electric capacity C2, the second described input power of termination.
Power formula circuit for controlling speed of fan the most according to claim 2, it is characterised in that described power-sensing circuit is
Current transformer T1, the primary coil of described current transformer T1 terminates described being dissipated as the input of described power-sensing circuit
Thermal, the first end of secondary coil and the second end all terminate the input of described rectification circuit as the output of described power-sensing circuit
End.
Power formula circuit for controlling speed of fan the most according to claim 2, it is characterised in that described rectification circuit is by two
The bridge rectifier of pole pipe D1, diode D2, diode D3, diode D4 composition；
The positive pole of described diode D1 and the negative pole of described diode D4 are all as the input described merit of termination of described rectification circuit
The outfan of rate testing circuit, the negative pole of described diode D1 terminates described filter circuit as the output of described rectification circuit
Input, the plus earth of described diode D4.
Power formula circuit for controlling speed of fan the most according to claim 2, it is characterised in that described filter circuit is an electricity
Holding C1, described electric capacity C1 the first end is as input the termination outfan of described rectification circuit, the described electric capacity of described filter circuit
C1 the first end is simultaneously as the input of the output described output circuit of termination of described filter circuit, and described electric capacity C1 second terminates
Ground.
Power formula circuit for controlling speed of fan the most according to claim 2, it is characterised in that described output circuit includes electricity
Resistance R1, resistance R2, resistance R3；
First end of described resistance R1 terminates the outfan of described filter circuit, the second termination as the input of described output circuit
Ground；
First termination first end of described resistance R1 of described resistance R2, first end of the second described resistance R3 of termination, described electricity
The second end ground connection of resistance R3；
First end of described resistance R3 is as the input of the output described control unit of termination of described output circuit.
8. a fan assembly, it is characterised in that include that the power formula rotation speed of the fan as described in any one of claim 1-7 controls
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210149901.8A CN103423184B (en) | 2012-05-15 | 2012-05-15 | A kind of power formula circuit for controlling speed of fan and fan assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210149901.8A CN103423184B (en) | 2012-05-15 | 2012-05-15 | A kind of power formula circuit for controlling speed of fan and fan assembly |
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| CN103423184A CN103423184A (en) | 2013-12-04 |
| CN103423184B true CN103423184B (en) | 2016-12-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105822585B (en) * | 2015-01-09 | 2017-11-14 | 中国长城科技集团股份有限公司 | A kind of multi-mode fan control circuitry, heat abstractor and electronic equipment being delayed |
| US20180054918A1 (en) * | 2016-08-18 | 2018-02-22 | Futurewei Technologies, Inc. | Proactive fan speed adjustment |
| CN113347750B (en) * | 2020-02-18 | 2023-06-16 | 青岛海尔电冰箱有限公司 | Control method for heating unit, heating unit and refrigerating and freezing device |
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| CN2586835Y (en) * | 2002-07-23 | 2003-11-19 | 迎广科技股份有限公司 | Rotational speed governor for power type fan |
| US20040263105A1 (en) * | 2003-06-25 | 2004-12-30 | Ming-Shi Tsai | Thermal control variable-speed circuit without switching noise |
| CN101477393A (en) * | 2009-01-19 | 2009-07-08 | 浪潮电子信息产业股份有限公司 | Method for reducing system noise through power supply |
| CN202612162U (en) * | 2012-05-15 | 2012-12-19 | 中国长城计算机深圳股份有限公司 | Power-type fan rotational speed control circuit and fan device |
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2012
- 2012-05-15 CN CN201210149901.8A patent/CN103423184B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2586835Y (en) * | 2002-07-23 | 2003-11-19 | 迎广科技股份有限公司 | Rotational speed governor for power type fan |
| US20040263105A1 (en) * | 2003-06-25 | 2004-12-30 | Ming-Shi Tsai | Thermal control variable-speed circuit without switching noise |
| CN101477393A (en) * | 2009-01-19 | 2009-07-08 | 浪潮电子信息产业股份有限公司 | Method for reducing system noise through power supply |
| CN202612162U (en) * | 2012-05-15 | 2012-12-19 | 中国长城计算机深圳股份有限公司 | Power-type fan rotational speed control circuit and fan device |
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| CN103423184A (en) | 2013-12-04 |
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Address after: 518057 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee after: China the Great Wall science and technology group Limited by Share Ltd Address before: 518057 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee before: China Changcheng Computer Shenzhen Co., Ltd. |
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