CN104343714B - Circuit and device for controlling rotating speed of fan - Google Patents
Circuit and device for controlling rotating speed of fan Download PDFInfo
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- CN104343714B CN104343714B CN201410503378.3A CN201410503378A CN104343714B CN 104343714 B CN104343714 B CN 104343714B CN 201410503378 A CN201410503378 A CN 201410503378A CN 104343714 B CN104343714 B CN 104343714B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The embodiment of the invention provides a circuit and a device for controlling the rotating speed of a fan and relates to the field of electronic equipment. The circuit and the device are used for reducing the selection limitation to the types of the fans. The circuit comprises a temperature sampling unit, a voltage reference chip, an amplifying unit and a first resistance unit, wherein a first end of the temperature sampling unit is connected with a first end of the amplifying unit; a second end of the temperature sampling unit is connected with a reference voltage input end of the voltage reference chip; a third end of the temperature sampling unit is grounded; a cathode output end of the voltage reference chip is connected with a second end of the amplifying unit and one end of the first resistance unit; a common anode end of the voltage reference chip is grounded; the other end of the first resistance unit and a third end of the amplifying unit are respectively connected with a direct current power supply; the temperature sampling unit acquires the temperature of equipment, converts the temperature into first voltage and outputs the first voltage to the voltage reference chip; the voltage reference chip generates corresponding current, so that voltage at two ends of the first resistance unit changes according to the current; the amplifying unit is used for receiving second voltage, amplifying the second voltage and outputs the second voltage to the fan.
Description
Technical field
The present invention relates to electronic device field, more particularly, to a kind of circuit for controlling speed of fan and device.
Background technology
Supply unit, when powering for electrical equipment, has part electric energy can change into heat energy, so that supply unit is sent out
Heat.And the power-on time of supply unit is longer, temperature is also higher, and the stability of supply unit so can be led to poor, so in order to
The stability improving supply unit, it is necessary to be adjusted to the temperature of supply unit, generally carrys out regulation power supply dress using fan
The temperature put.
In existing circuit for controlling speed of fan, as shown in figure 1, including constant-current circuit 101, temperature sampling circuit 102,
Dc source 103, the drive circuit 105 in pulse-width modulation circuit 104 and fan.Specifically connected mode is：Constant-current circuit 101
It is connected with the input of temperature sampling circuit 102 and dc source 103 respectively；The output end of temperature sampling circuit 102 and pulsewidth
The input of modulation circuit 104 connects；The output end of pulse-width modulation circuit 104 is connected with the drive circuit 105 in fan.Its
In, temperature sampling circuit 102 includes the thermistor for producing change in resistance according to power source temperature；Constant-current circuit 101 is temperature
Degree sample circuit provides fixing electric current.Specifically operation principle is：When the temperature of supply unit raises, the resistance of thermistor
Value reduces, because constant-current circuit 101 provides the electric current of fixation for temperature sampling circuit 102, so the electric current of thermistor is perseverance
Fixed, then the voltage at thermistor two ends reduces, thus the temperature transition of power supply is voltage signal, and will be defeated for this voltage signal
Go out to pulse-width modulation circuit 104, pulse-width modulation circuit generates the certain pulse signal of dutycycle according to this voltage signal, and by this
Pulse signal sends the drive circuit 105 to fan, so that the drive circuit 105 in fan carries according to this pulse signal
The rotating speed of high fan, and then reduce the temperature of supply unit；The operation principle when temperature of supply unit reduces is filled with power supply
The operation principle that the temperature put raises is similar to.
But during above-mentioned realization, pulse-width modulation circuit 104 is generating dutycycle one according to the voltage signal receiving
After fixed pulse signal, need the drive circuit 105 sending this pulse signal to fan, so that the driving electricity in fan
Road 105 adjusts the rotating speed of fan according to this pulse signal.So foregoing circuit is only applicable to the drive with identification pulse signal
The fan of dynamic circuit, and inapplicable to other kinds of fan, and the selection of fan type is restricted, and increased the choosing of fan
Use cost.
Content of the invention
Embodiments of the invention provide a kind of circuit for controlling speed of fan and device, are adjusted by controlling the voltage of fan
The rotating speed of fan, reduces the selectional restriction of fan type.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
The embodiment of the present invention provides a kind of circuit for controlling speed of fan, including：Temperature sampling unit, voltage reference chip,
Amplifying unit and first resistor unit；The first end of described temperature sampling unit is connected with the first end of described amplifying unit, the
Two ends are connected with the reference voltage input terminal of described voltage reference chip, the 3rd end ground connection；The negative electrode of described voltage reference chip
Output end is connected with the second end of described amplifying unit and one end of described first resistor unit respectively, described voltage reference chip
Public anode end ground connection；3rd end of the other end of described first resistor unit and described amplifying unit is all with dc source even
Connect；Described temperature sampling unit, for the temperature of collecting device, and described temperature inversion is to export to described after first voltage
The reference voltage pin of voltage reference chip；Described voltage reference chip, for producing and described the according to described first voltage
The corresponding electric current of one voltage, so that the voltage at described first resistor unit two ends changes according to described electric current；Described put
Big unit, for receiving second voltage, and exports after the amplification of described second voltage to fan so that described fan is according to amplification
Voltage afterwards carries out rotational speed regulation；Described second voltage is the voltage of described dc source and described first resistor unit two ends
The difference of voltage.
Optionally, described temperature sampling unit includes：Second resistance unit and negative tempperature coefficient thermistor；Described second
One end of resistance unit is connected with the output end of described amplifying unit, the other end respectively with described negative tempperature coefficient thermistor
The reference voltage input terminal of one end and described voltage reference chip connects；Another termination of described negative tempperature coefficient thermistor
Ground.
Optionally, described temperature sampling unit also includes：3rd resistor unit；Described 3rd resistor unit and described subzero temperature
Degree coefficient resistance is in parallel.
Optionally, described negative tempperature coefficient thermistor is arranged at predeterminable range；Described predeterminable range is described subzero temperature
The minimum distance of the heating position of degree coefficient resistance and described equipment.
Optionally, described temperature sampling unit includes：4th resistance unit and semistor；Described positive temperature
Degree coefficient resistance one end be connected with the output end of described amplifying unit, the other end respectively with described 4th resistance unit
The reference voltage input terminal of one end and described voltage reference chip connects；The other end ground connection of described 4th resistance unit.
Optionally, described temperature sampling unit also includes：5th resistance unit；Described 5th resistance unit and described positive temperature
Degree coefficient resistance is in parallel.
Optionally, described semistor is arranged at predeterminable range；Described predeterminable range is described positive temperature
The minimum distance of the heating position of degree coefficient resistance and described equipment.
Optionally, described amplifying unit includes：NPN triode.
The embodiment of the present invention provides a kind of fan rotation speed control apparatus, including：Rotation speed of the fan control described in above-described embodiment
Circuit processed.
The embodiment of the present invention provides a kind of circuit for controlling speed of fan and device, and wherein, circuit for controlling speed of fan includes：
Temperature sampling unit, voltage reference chip, dc source, amplifying unit and first resistor unit, temperature sampling unit will gather
To the temperature inversion of equipment be to export to voltage reference chip after first voltage, voltage reference chip produces and this first voltage
Corresponding electric current, so that the voltage at first resistor unit two ends changes, and the voltage that dc source provides is fixing
Value, then the voltage amplifying the 3rd end of voltage is the difference with the voltage at first resistor unit two ends for the voltage of dc source, that is,
Amplifying unit receives second voltage, further, amplifying unit second voltage is amplified after voltage output to fan,
So that fan provides suitable rotating speed according to the voltage after amplifying, it is achieved thereby that being adjusted according to the change of the temperature of equipment
The rotating speed of fan, has reached the purpose that equipment is radiated accordingly.It is to adjust so due to inputting in the present invention to fan
The voltage of section rotating speed, so polytype fan all can adjust rotating speed according to this voltage, that is, the present invention inputs to fan
Voltage can directly the rotating speed of fan be adjusted, and inputting in prior art to fan is pulse signal, therefore also
Fan is needed to possess the drive circuit of identification pulse signal, so for the prior art that compares, the fan that the present invention provides turns
Fast control circuit reduces the requirement to fan circuit, goes for polytype fan.
Brief description
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be in embodiment or description of the prior art
The accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description be only the present invention some are real
Apply example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 fans the schematic diagram of rotating-speed control circuit for prior art wind；
Fig. 2 is a kind of schematic diagram of circuit for controlling speed of fan provided in an embodiment of the present invention；
Fig. 3 is the internal structure equivalent schematic of the voltage reference chip shown in Fig. 2；
Fig. 4 is the schematic diagram of another kind circuit for controlling speed of fan provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram of another kind circuit for controlling speed of fan provided in an embodiment of the present invention；
Fig. 6 is the schematic diagram of another kind circuit for controlling speed of fan provided in an embodiment of the present invention；
Fig. 7 is the schematic diagram of another kind circuit for controlling speed of fan provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
The embodiment of the present invention provides a kind of circuit for controlling speed of fan, as shown in Fig. 2 including：Temperature sampling unit 201,
Voltage reference chip 202, amplifying unit 203 and first resistor unit 204.
The first end of described temperature sampling unit 201 is connected with the first end of described amplifying unit 203, the second end with described
The reference voltage input terminal (REF) of voltage reference chip 202 connects, the 3rd end ground connection；The negative electrode of described voltage reference chip 202
Output end (Cathode) is connected with the second end of described amplifying unit 203 and one end of described first resistor unit 204 respectively,
Public anode end (Anode) ground connection of described voltage reference chip 202；The other end of described first resistor unit 204 and described
3rd end of amplifying unit 203 is all connected with dc source.
Described temperature sampling unit 201, for the temperature of collecting device, and described temperature inversion is defeated after first voltage
Go out to the reference voltage pin of described voltage reference chip 202.
Described voltage reference chip 202, for electric current corresponding with described first voltage is produced according to described first voltage,
So that the voltage at described first resistor unit 204 two ends changes according to described electric current.
Described amplifying unit 203, for receiving second voltage, and exports to fan after described second voltage is amplified, with
Described fan is made to carry out rotational speed regulation according to the voltage after amplifying.
Wherein, described second voltage is the voltage with described first resistor unit 204 two ends for the voltage of described dc source
Difference.
Specifically, the temperature of temperature collecting cell 201 collecting device, and the temperature inversion of the equipment collecting is to correspond to
First voltage, and this first voltage is exported to the reference voltage pin of voltage reference chip 202, as shown in figure 3, it is electricity
The internal structure isoboles of pressure fiducial chip 202 is it can be seen that the reference voltage pin of voltage reference chip 202 and internal arithmetic
The in-phase input end of amplifier connects, and the inverting input of internal arithmetic amplifier is connected with the reference voltage of fixation, by transporting
The characteristic calculating amplifier understands, when first voltage is close to reference voltage, in the triode being connected with internal arithmetic amplifier
Have electric current corresponding with first voltage to pass through, and when first voltage is bigger, the electric current that voltage reference chip 202 produces also can phase
Should increase, and the cathode end due to voltage reference chip 202 is connected with the colelctor electrode being internal triode, public anode end
It is connected and is grounded with the transmitting collection of internal triode, so this electric current is exported by public anode end, and because dc source leads to
Cross first resistor unit 204 to be connected with the cathode end of voltage reference chip, so flowing into the electric current of first resistor unit 204
Also it is electric current corresponding with first voltage, so that the voltage at first resistor unit 204 two ends changes, and dc source
Voltage be fixing, then the voltage being added in the 3rd end amplifying voltage 203 is voltage and the first resistor unit of dc source
The difference of the voltage at 204 two ends, as second voltage, due to first resistor unit 204 two ends voltage with first voltage
Corresponding electric current changes, and first voltage is again corresponding with the temperature of equipment, it follows that the change of second voltage is also
Corresponding with the temperature of equipment, further, amplify voltage 203 and the second voltage receiving is amplified, and after amplifying
Voltage output to fan driver element so that the driver element of fan carries out the tune of rotating speed according to the voltage after this amplification
Section, because second voltage is corresponding with the temperature of equipment, then the voltage after amplifying is also corresponding with the temperature of equipment, so fan
It is also the Temperature Matching with equipment according to the rotating speed that the voltage after amplifying provides, thus effectively radiating to equipment.
It should be noted that described equipment can be supply unit or other equipment that operationally can generate heat,
The present invention is without limitation.
It should be noted that the selection of the resistance of first resistor unit 204 needs to meet the negative electrode of voltage reference chip 202
The condition of output end work.
It should be noted that voltage reference chip 202 can be the chip of Multiple Type, such as：TL431,
ZTL431AH6TA etc., the present invention is without limitation.
The embodiment of the present invention provides a kind of circuit for controlling speed of fan, including：Temperature sampling unit, voltage reference chip,
Dc source, amplifying unit and first resistor unit, the temperature inversion of the equipment collecting is the first electricity by temperature sampling unit
Export after pressure to voltage reference chip, voltage reference chip produces electric current corresponding with this first voltage, so that the first electricity
The voltage at resistance unit two ends changes, and the voltage that dc source provides is fixed value, then amplify the electricity at the 3rd end of voltage
Press the difference of the voltage for dc source and the voltage at first resistor unit two ends, that is, amplifying unit receives second voltage, enters
One step, amplifying unit second voltage is amplified after voltage output to fan so that fan is according to the electricity after amplifying
Pressure provides suitable rotating speed, it is achieved thereby that adjust the rotating speed of fan according to the change of the temperature of equipment, has reached to equipment
The purpose being radiated accordingly.So, it is the voltage adjusting rotating speed due to inputting in the present invention to fan, so multiple types
The fan of type all can adjust rotating speed according to this voltage, and that is, the present invention inputs and can directly fan be turned to the voltage of fan
Speed is adjusted, and inputting in prior art to fan is pulse signal, therefore also needs to fan and possesses identification pulse signal
Drive circuit, so for the prior art that compares, the circuit for controlling speed of fan that the present invention provides reduces to fan class
The selectional restriction of type, goes for polytype fan.
It should be noted that the difference of the type according to the thermistor chosen, the circuit of temperature sampling unit 201 is not yet
With when thermistor is for negative tempperature coefficient thermistor, the circuit of temperature sampling unit 201 is as shown in figs. 4 and 5；In heat
When quick resistance is semistor, the circuit of temperature sampling unit 201 is as shown in Figures 6 and 7.
As shown in figure 4, described temperature sampling unit 201 includes：Second resistance unit 2011 and negative temperature coefficient thermistor power
Resistance 2012.
One end of described second resistance unit 2011 is connected with the output end of described amplifying unit 203, the other end respectively with
The reference voltage input terminal of one end of described negative tempperature coefficient thermistor 2012 and described voltage reference chip 202 connects；Institute
State the other end ground connection of negative tempperature coefficient thermistor 2012.
Preferably, described negative tempperature coefficient thermistor 2012 is arranged at predeterminable range.Described predeterminable range is described
The minimum distance of the heating position of negative tempperature coefficient thermistor 2012 and described equipment.
Specifically, negative tempperature coefficient thermistor 2012 is used for the temperature of collecting device, when the temperature of equipment raises, bears
The resistance of temperature coefficient thermistor 2012 reduces, then second resistance unit 2011 and negative tempperature coefficient thermistor 2012 is total
Resistance reduces, thus the electric current flowing through in second resistance unit 2011 and the series loop of negative tempperature coefficient thermistor 2012 increases
Greatly, because the resistance of second resistance unit 2011 is fixed value, then the voltage at second resistance unit 2011 two ends increases so that bearing
The voltage at temperature coefficient thermistor 2012 two ends reduces, thus the temperature inversion of equipment is voltage, as first voltage, and
Due to one end ground connection of negative tempperature coefficient thermistor 2012, the reference voltage input terminal of the other end and voltage reference chip 202
Connect, then the voltage of the reference voltage input terminal of voltage reference chip 202 is changed into first voltage that is to say, that voltage reference core
The voltage of the reference voltage input terminal of piece 202 reduces, then voltage reference chip 202 produces and the according to the first voltage receiving
The corresponding electric current of one voltage also accordingly reduces, so that the electric current flowing through first resistor unit 204 also reduces, then first resistor
The voltage at unit 204 two ends reduces, so the voltage at the 3rd end of amplifying unit 203 increases, that is, is changed into second voltage, further
Second voltage is amplified, and by the voltage output after amplifying to fan, so the voltage that now fan receives increases, from
And make the faster rotational speed of fan it is achieved that the equipment that temperature is raised carries out quick heat radiating.
When the temperature of equipment reduces, the resistance of negative tempperature coefficient thermistor 2012 increases, then second resistance unit
2011 are increased with the total resistance of negative tempperature coefficient thermistor 2012, thus flowing through second resistance unit 2011 and negative temperature coefficient
Electric current in the series loop of thermistor 2012 reduces, because the resistance of second resistance unit 2011 is fixed value, then second
The voltage at resistance unit 2011 two ends reduces so that then the voltage at negative tempperature coefficient thermistor 2012 two ends increases, thus will
The temperature inversion of equipment is voltage, as first voltage, and one end ground connection due to negative tempperature coefficient thermistor 2012, another
End is connected with the reference voltage input terminal of voltage reference chip 202, then the electricity of the reference voltage input terminal of voltage reference chip 202
Buckling be first voltage that is to say, that the reference voltage input terminal of voltage reference chip 202 voltage increase, then voltage reference
Chip 202 according to the first voltage that receives produce also corresponding to the corresponding electric current of first voltage increase so that flowing through the
The electric current of one resistance unit 204 also increases, then the voltage at first resistor unit 204 two ends increases, so the of amplifying unit 203
The voltage at three ends reduces, that is, be changed into second voltage, be amplified second voltage further, and by the voltage output after amplifying extremely
Fan, so the voltage that now fan receives reduces, so that the spin down of fan, reaches using electricity wisely and extends wind
The effect in fan life-span.
It should be noted that the selection of the resistance of second resistance unit 2011 needs to ensure to flow into negative temperature coefficient thermistor power
The electric current of resistance 2012 should be tried one's best little so that the heat energy of negative tempperature coefficient thermistor 2012 generation is as far as possible little, so that subzero temperature
The change of the resistance of degree coefficient resistance 2012 is less by the impact of the temperature of itself, improves negative tempperature coefficient thermistor
The accuracy of the sampling of the temperature of 2012 pairs of equipment.Further, the embodiment of the present invention is by negative tempperature coefficient thermistor 2012
It is arranged at the nearest position of the heating position of equipment, so it is also possible to raising negative tempperature coefficient thermistor 2012 is right
The accuracy of the sampling of the temperature of equipment.
Further, as shown in figure 5, described temperature sampling unit 201 also includes：3rd resistor unit 2013.
Described 3rd resistor unit 2013 is in parallel with described negative tempperature coefficient thermistor 2012.
Specifically, 3rd resistor unit 2013, for adjusting the reference voltage inputting to voltage reference chip 202 further
The voltage of input.
As shown in fig. 6, described temperature sampling unit 201 includes：4th resistance unit 2014 and positive temperature coefficient temperature-sensitive electricity
Resistance 2015.
One end of described semistor 2015 is connected with the output end of described amplifying unit 203, the other end
It is connected with described one end of 4th resistance unit 2014 and the reference voltage input terminal of described voltage reference chip 202 respectively；Institute
State the other end ground connection of the 4th resistance unit 2014.
Preferably, described semistor 2015 is arranged at predeterminable range.Described predeterminable range is described
The minimum distance of the heating position of semistor 2015 and described equipment.
Specifically, semistor 2012 is used for the temperature of collecting device, when the temperature of equipment raises, just
The resistance of temperature coefficient thermistor 2012 increases, then the 4th resistance unit 2014 and semistor 2015 is total
Resistance increases, thus the electric current flowing through the 4th resistance unit 2014 with semistor 2015 reduces, then the 4th electricity
The voltage at resistance unit 2014 two ends reduces, due to one end ground connection, the other end and the voltage reference chip of the 4th resistance unit 2014
202 reference voltage input terminal connects, then the reference voltage input terminal of voltage reference chip 202 is changed into first voltage, that is,
Say, the voltage of the reference voltage input terminal of voltage reference chip 202 reduces, then voltage reference chip 202 is according to the receiving
One voltage produces reduce, so that flow through the electric current of first resistor unit 204 also corresponding to the corresponding electric current of first voltage
Reduce, then the voltage at first resistor unit 204 two ends reduces, so the voltage at the 3rd end of amplifying unit 203 increases, that is, be changed into
Second voltage is amplified by second voltage further, and by the voltage output after amplifying to fan, so now fan receives
The voltage arriving increases, so that the faster rotational speed of fan is it is achieved that the equipment that temperature is raised carries out quick heat radiating.
When the temperature of equipment reduces, the resistance of semistor 2012 reduces, then the 4th resistance unit
2014 are reduced with the total resistance of semistor 2015, thus flowing through the 4th resistance unit 2014 and positive temperature coefficient
The electric current of thermistor 2015 increases, then the voltage at the 4th resistance unit 2014 two ends increases, due to the 4th resistance unit 2014
One end ground connection, the other end is connected with the reference voltage input terminal of voltage reference chip 202, then the ginseng of voltage reference chip 202
Examine voltage input end and be changed into first voltage that is to say, that the voltage of the reference voltage input terminal of voltage reference chip 202 increases,
Then voltage reference chip 202 according to the first voltage that receives produce also corresponding to the corresponding electric current of first voltage increase, thus
So that the electric current flowing through first resistor unit 204 also increases, then the voltage at first resistor unit 204 two ends increases, so amplifying
The voltage at the 3rd end of unit 203 reduces, that is, be changed into second voltage, be amplified second voltage further, and after amplifying
Voltage output to fan, so the voltage that now fan receives reduces, so that the spin down of fan, reach saving
Electricity consumption and the effect extending fan life.
It should be noted that the selection of the resistance of the 4th resistance unit 2014 needs to ensure to flow into positive temperature coefficient temperature-sensitive electricity
The electric current of resistance 2015 should be tried one's best little so that the heat energy of semistor 2015 generation is as far as possible little, so that just temperature
The change of the resistance of degree coefficient resistance 2015 is less by the impact of the temperature of itself, improves semistor
The accuracy of the sampling of the temperature of 2015 pairs of equipment.Further, the embodiment of the present invention is by semistor 2015
It is arranged at the nearest position of the heating position of equipment, so it is also possible to raising semistor 2015 is right
The accuracy of the sampling of the temperature of equipment.
Further, as shown in fig. 7, the temperature sampling unit 201 described in Fig. 6 also includes：5th resistance unit 2015.
Described 5th resistance unit 2015 is in parallel with described semistor 2015.
Specifically, the 5th resistance unit 2015, for adjusting the reference voltage inputting to voltage reference chip 202 further
The voltage of input.
Optionally, described amplifying unit 203 includes：NPN (negative pole-positive pole-negative pole, Negative-Positive-
Negative) triode.
Specifically, when amplifying unit is for NPN triode, specific connected mode is：The emitter stage of NPN triode and temperature
The first end of degree sampling unit 201 connects；The base stage of NPN triode respectively with the cathode end of voltage reference chip 202 and
One end of first resistor unit connects；The colelctor electrode of the NPN triode other end and the dc source with first resistor unit respectively
Connect.
It should be noted that amplifying unit 203 can also be other circuit with amplification, such as NMOS (N-
Metal-Oxide-Semicond-uctor-Field-Effect-Transis-tor, N-type-Metal-oxide-semicondutor-field
Effect transistor) etc., the present invention is without limitation.
It should be noted that what the amplifying unit 203 in Fig. 3 to Fig. 7 all taking NPN triode was as a example attached.
It should be noted that because the first end of temperature sampling unit 201 is to be connected with the first end of amplifying unit 203,
And as the above analysis, the first end of amplifying unit 203 is used for the second voltage after output is amplified, so temperature sampling unit
The voltage that 201 first end receives be amplify after second voltage, will amplifying unit 203 output amplification after second electricity
Pressure is fed back, and thereby may be ensured that the stability of the voltage of amplifying unit 203 output.
The embodiment of the present invention provides a kind of circuit for controlling speed of fan, including：Temperature sampling unit, voltage reference chip,
Dc source, amplifying unit and first resistor unit, wherein, temperature sampling unit includes the negative temperature of the temperature of collecting device
Coefficient resistance, or semistor, when the temperature of equipment changes, negative tempperature coefficient thermistor
Resistance reduce, the resistance of semistor increases, so the type selecting according to thermistor is different, the company of its circuit
Connect the difference of mode, but finally make temperature sampling unit export to voltage reference the temperature inversion of equipment for after first voltage
Chip, voltage reference chip produces electric current corresponding with this first voltage, so that the voltage at first resistor unit two ends is sent out
Raw change, and the voltage that dc source provides is fixed value, then the voltage amplifying the 3rd end of voltage is the voltage of dc source
With the difference of the voltage at first resistor unit two ends, that is, amplifying unit receive second voltage, further, amplifying unit is by
Two voltages be amplified after voltage output to fan so that fan provides suitable rotating speed according to the voltage after amplifying, from
And achieve the change of the temperature according to the equipment rotating speed to adjust fan, reach the mesh that equipment is radiated accordingly
's.So, due to input in the present invention to fan be adjust rotating speed voltage, so polytype fan all can basis
Adjusting rotating speed, that is, the present invention inputs and can directly the rotating speed of fan be adjusted to the voltage of fan this voltage, and existing
Inputting in technology to fan is pulse signal, therefore also needs to the drive circuit that fan possesses identification pulse signal, so phase
Relatively for prior art, the circuit for controlling speed of fan that the present invention provides reduces the selectional restriction to fan type, permissible
It is applied to polytype fan.Simultaneously as negative tempperature coefficient thermistor, or semistor is respectively provided with
At the minimum distance apart from the heating part of equipment, thus improve the accuracy of the sampling of the temperature to equipment.
The embodiment of the present invention provides a kind of fan rotation speed control apparatus, controls including the rotation speed of the fan described in above-described embodiment
Circuit.
The embodiment of the present invention provides a kind of circuit for controlling speed of fan and device, including circuit for controlling speed of fan, and wind
Fan rotating-speed control circuit includes:Temperature sampling unit, voltage reference chip, dc source, amplifying unit and first resistor unit,
The temperature inversion of the equipment collecting is exported to voltage reference chip, voltage reference core by temperature sampling unit for after first voltage
Piece produces electric current corresponding with this first voltage, so that the voltage at first resistor unit two ends changes, and direct current
The voltage that source provides is fixed value, then the voltage amplifying the 3rd end of voltage is voltage and the first resistor unit two of dc source
End voltage difference, that is, amplifying unit receive second voltage, further, after second voltage is amplified by amplifying unit
Voltage output to fan so that fan provides suitable rotating speed according to the voltage after amplifying, it is achieved thereby that according to equipment
Temperature the rotating speed to adjust fan for the change, reached the purpose that equipment is radiated accordingly.So, due to the present invention
Middle input to fan be adjust rotating speed voltage, so polytype fan all can adjust rotating speed according to this voltage,
I.e. the present invention inputs and can directly the rotating speed of fan be adjusted to the voltage of fan, and inputs to fan in prior art
It is pulse signal, therefore also need to the drive circuit that fan possesses identification pulse signal, so for the prior art that compares, this
The circuit for controlling speed of fan that invention provides reduces the selectional restriction to fan type, goes for polytype wind
Fan.
It should be noted that the combination that each resistance unit above can be one or more devices is realized, that is, above-mentioned
One resistance unit can include at least one resistance, when comprising at least two resistance in any of the above-described resistance unit, described electricity
Resistance in resistance unit can be in parallel or series connection, and the size of described resistance can be fixing or
Change.
It should be understood that disclosed system in several embodiments provided herein, apparatus and method are permissible
Realize by another way.For example, device embodiment described above is only schematically, for example, described unit
Divide, only a kind of division of logic function, actual can have other dividing mode when realizing, for example multiple units or assembly
Can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not execute.Another, shown or
The coupling each other discussing or direct-coupling or communication connection can be by some interfaces, the indirect coupling of device or unit
Close or communicate to connect, can be electrical, mechanical or other forms.
The described unit illustrating as separating component can be or may not be physically separate, show as unit
The part showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.The mesh to realize this embodiment scheme for some or all of unit therein can be selected according to the actual needs
's.
In addition, can be integrated in a processing unit in each functional unit in each embodiment of the present invention it is also possible to
It is that the independent physics of unit is included it is also possible to two or more units are integrated in a unit.Above-mentioned integrated list
Unit both can be to be realized in the form of hardware, it would however also be possible to employ the form that hardware adds SFU software functional unit is realized.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in an embodied on computer readable and deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions with so that a computer
Equipment (can be personal computer, server, or network equipment etc.) executes the portion of each embodiment methods described of the present invention
Step by step.And aforesaid storage medium includes：USB flash disk, portable hard drive, read-only storage (Read-Only Memory, referred to as
ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic disc or CD etc. are various can store
The medium of program code.
Finally it should be noted that：Above example only in order to technical scheme to be described, is not intended to limit；Although
With reference to the foregoing embodiments the present invention is described in detail, it will be understood by those within the art that：It still may be used
To modify to the technical scheme described in foregoing embodiments, or equivalent is carried out to wherein some technical characteristics；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (9)
1. a kind of circuit for controlling speed of fan is it is characterised in that include：Temperature sampling unit, voltage reference chip, direct current
Source, amplifying unit and first resistor unit；
The first end of described temperature sampling unit is connected with the first end of described amplifying unit, the second end and described voltage reference core
The reference voltage input terminal of piece connects, the 3rd end ground connection；The cathode end of described voltage reference chip respectively with described amplification
One end of second end of unit and described first resistor unit connects, the public anode end ground connection of described voltage reference chip；Institute
3rd end of the other end and described amplifying unit of stating first resistor unit is all connected with dc source；
Described temperature sampling unit, for the temperature of collecting device, and by described temperature inversion for exporting after first voltage to institute
State the reference voltage pin of voltage reference chip；
Described voltage reference chip, for electric current corresponding with described first voltage is produced according to described first voltage, so that
The voltage at described first resistor unit two ends changes according to described electric current；The reference voltage pin of described voltage reference chip
It is connected with the in-phase input end of internal arithmetic amplifier, and the inverting input of described internal arithmetic amplifier and fixing benchmark
Voltage connects；
Described amplifying unit, for receiving second voltage, and will described second voltage amplify after export to fan so that described wind
Fan carries out rotational speed regulation according to the voltage after amplifying；Described second voltage is the voltage of described dc source and described first resistor
The difference of the voltage at unit two ends.
2. circuit for controlling speed of fan according to claim 1 is it is characterised in that described temperature sampling unit includes：The
Two resistance units and negative tempperature coefficient thermistor；
One end of described second resistance unit is connected with the output end of described amplifying unit, the other end respectively with described negative temperature system
The reference voltage input terminal of one end of number thermistor and described voltage reference chip connects；Described negative tempperature coefficient thermistor
The other end ground connection.
3. circuit for controlling speed of fan according to claim 2 is it is characterised in that described temperature sampling unit also includes：
3rd resistor unit；
Described 3rd resistor unit is in parallel with described negative tempperature coefficient thermistor.
4. the circuit for controlling speed of fan according to Claims 2 or 3 is it is characterised in that described negative temperature coefficient thermistor power
Resistance is arranged at predeterminable range；Described predeterminable range is the heating position of described negative tempperature coefficient thermistor and described equipment
Minimum distance.
5. circuit for controlling speed of fan according to claim 1 is it is characterised in that described temperature sampling unit includes：The
Four resistance units and semistor；
One end of described semistor is connected with the output end of described amplifying unit, and the other end is respectively with described
The reference voltage input terminal of one end of four resistance units and described voltage reference chip connects；Described 4th resistance unit another
End ground connection.
6. circuit for controlling speed of fan according to claim 5 is it is characterised in that described temperature sampling unit also includes：
5th resistance unit；
Described 5th resistance unit is in parallel with described semistor.
7. the circuit for controlling speed of fan according to claim 5 or 6 is it is characterised in that described positive temperature coefficient temperature-sensitive is electric
Resistance is arranged at predeterminable range；Described predeterminable range is the heating position of described semistor and described equipment
Minimum distance.
8. circuit for controlling speed of fan according to claim 1 is it is characterised in that described amplifying unit includes：NPN tri- pole
Pipe.
9. a kind of fan rotation speed control apparatus are it is characterised in that the rotation speed of the fan including described in any one of claim 1-8 controls
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410503378.3A CN104343714B (en) | 2014-09-26 | 2014-09-26 | Circuit and device for controlling rotating speed of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410503378.3A CN104343714B (en) | 2014-09-26 | 2014-09-26 | Circuit and device for controlling rotating speed of fan |
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| Publication Number | Publication Date |
|---|---|
| CN104343714A CN104343714A (en) | 2015-02-11 |
| CN104343714B true CN104343714B (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410503378.3A Active CN104343714B (en) | 2014-09-26 | 2014-09-26 | Circuit and device for controlling rotating speed of fan |
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| CN (1) | CN104343714B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605778A (en) * | 2017-07-24 | 2018-01-19 | 张家港市华为电子有限公司 | A kind of control circuit for being used for the fan for charger cooling |
| CN111271309B (en) * | 2018-12-04 | 2022-04-05 | 合勤科技股份有限公司 | Linear control circuit and method thereof |
| CN115113677A (en) * | 2022-07-15 | 2022-09-27 | 西安诺瓦星云科技股份有限公司 | Voltage regulating circuit, voltage regulating device and electronic equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5197858A (en) * | 1991-10-23 | 1993-03-30 | Delta Electronics, Inc. | Thermal control variable speed DC brushless fan |
| CN2708010Y (en) * | 2004-04-01 | 2005-07-06 | 周青麟 | Fan control device |
| CN201004190Y (en) * | 2007-02-06 | 2008-01-09 | 浪潮电子信息产业股份有限公司 | An energy-saving noise reduction power supply |
| CN201859380U (en) * | 2010-09-30 | 2011-06-08 | 程小莉 | Automatic radiating control device of computer switch power supply |
| CN202132262U (en) * | 2011-06-15 | 2012-02-01 | 惠州市德赛视听科技有限公司 | Fan control circuit |
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