CN209145941U - A kind of DC fan alignment circuit - Google Patents
A kind of DC fan alignment circuit Download PDFInfo
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- CN209145941U CN209145941U CN201821842545.7U CN201821842545U CN209145941U CN 209145941 U CN209145941 U CN 209145941U CN 201821842545 U CN201821842545 U CN 201821842545U CN 209145941 U CN209145941 U CN 209145941U
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- 230000033228 biological regulation Effects 0.000 description 4
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- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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Abstract
The utility model relates to a kind of DC fan alignment circuits, it includes temperature sampling circuit, signal generating circuit and blower starting or stopping control circuit, circuit and blower starting or stopping control circuit occur for the output end connection signal of the temperature sampling circuit, circuit occurs for the output end connection signal of the blower starting or stopping control circuit, and the output end of the signal generating circuit connects DC fan.Device used in the utility model alignment circuit is few, and circuit is simple, at low cost, has both played the stepless time adjustment function of DC fan, realizes and runs without Caton, low noise, while reducing energy consumption, realizes that effect is good.
Description
Technical field
The utility model relates to field of circuit control, and in particular to a kind of DC fan alignment circuit.
Background technique
Present electronic product, especially high-power electronic product are required to use blower and be radiated, to guarantee electronics
Product reliability of operation, but the loss of electronic product simultaneously, noise, cost are also important consideration factor.
In order to realize the heat dissipation of heating electronic product, the temperature of heating electronic product is controlled to a certain range, frequently with
DC fan carries out blast velocity control.Currently, mostly using microcomputer control or dedicated PWM to control chip greatly carries out speed regulation control to blower
System carries out fan speed regulation after needing to acquire environment temperature again, and circuit is complicated, at high cost.Existing fan speed regulating circuit can only be real
Existing pole speed regulation, energy consumption is high, and fan operation noise is big, and reliability is low.
Utility model content
In view of the above-mentioned problems, the purpose of this utility model is to provide a kind of DC fan alignment circuit, circuit cost
It is low, and can be realized the stepless time adjustment of blower.
In order to achieve the above purposes, the technical solution adopted by the utility model is:
A kind of DC fan alignment circuit comprising temperature sampling circuit, signal generating circuit and blower start-up and shut-down control electricity
Circuit and blower starting or stopping control circuit, the blower start and stop control occur for the output end connection signal on road, the temperature sampling circuit
Circuit occurs for the output end connection signal of circuit processed, and the output end of the signal generating circuit connects DC fan；
The signal generating circuit includes resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, capacitor C2, electricity
Hold C3, triode Q1 and 555 timer IC3；
The one end the resistance R12 is connected with the output end of temperature sampling circuit, one end of the other end and resistance R13, resistance
One end of R14 is connected with the 7th foot of 555 timer IC3；The other end of resistance R13 is connected with positive pole VCC；Resistance R14's
The other end is connected with the 2nd foot, the 6th foot of one end of capacitor C2,555 timer IC3；The other end and power cathode of capacitor C2
GND is connected；
The 1st foot of the 555 timer IC3 is connected with one end of capacitor C3 and power cathode GND；The other end of capacitor C3
It is connected with the 5th foot of 555 timer IC3；The 3rd foot of 555 timer IC3 is connected with one end of resistance R16；Resistance R16's is another
One end is connected with the B of triode Q1 grade；The C grade of triode Q1 is connected with positive pole VCC；The E grade and direct current wind of triode Q1
The electrode input end of machine is connected；The negative input of DC fan is connected with power cathode GND；The 8th foot of 555 timer IC3
It is connected with positive pole VCC；The 4th foot of 555 timer IC3 is connected with the output end of resistance R15 and blower starting or stopping control circuit；
The other end of resistance R15 is connected with positive pole VCC.
The temperature sampling circuit include resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7,
Capacitor C1, negative tempperature coefficient thermistor NTC1 and operational amplifier IC1；
The one end the resistance R1 is connected with positive pole VCC, one end of the other end and negative tempperature coefficient thermistor NTC1
It is connected with one end of resistance R5；The negative tempperature coefficient thermistor NTC1 other end is connected with power cathode GND；The one end resistance R2 with
Positive pole VCC is connected, and the other end is connected with one end of one end of resistance R3 and resistance R4；The other end and power supply of resistance R3 is negative
Pole GND is connected；The other end of resistance R4 is connected with the backward end of operational amplifier IC1；The other end and operation amplifier of resistance R5
The in-phase end of device IC1 is connected with one end of resistance R7；The other end of resistance R7 is connected with power cathode GND；One end of resistance R6
It is connected with the backward end of operational amplifier IC1, the other end is connected with the output end of operational amplifier IC1；The one end capacitor C1 and fortune
The output end for calculating amplifier IC1 is connected, and the other end is connected with power cathode GND.
The blower starting or stopping control circuit includes resistance R8, resistance R9, resistance R10, resistance R11, diode D1, voltage ratio
Compared with device IC2；
One end of the resistance R10 is connected with the output end of operational amplifier IC1, the cathode of the other end and diode D1 and
The backward end of voltage comparator ic 2 is connected；The anode of diode D1 is connected with DC fan fault-signal；One end of resistance R8 with
Positive pole VCC is connected, one end, one end of resistance R11 and the non-inverting input terminal of voltage comparator ic 2 of the other end and resistance R9
It is connected；The other end of resistance R9 is connected with power cathode GND；Resistance R11 is connected with the output end of voltage comparator ic 2.
After adopting the above scheme, the DC fan alignment circuit of the utility model passes through blower when environment temperature is lower
Starting or stopping control circuit controls signal generating circuit, closes DC fan；When environment temperature increases, by signal generating circuit,
The modulated square wave of high-frequency, low duty ratio is exported, DC fan slow rotation, when environment temperature gradually rises, signal occurs
Circuit can output low frequency rate, high duty ratio modulated square wave, DC fan quick rotation；When temperature is higher than upper limit value, letter
Number occur circuit output overall height level, DC fan at full speed rotate.When DC fan break down or device inside have it is other therefore
When barrier signal needs to close DC fan, it can achieve the purpose that close DC fan by closing pwm signal.
Device used in the alignment circuit of the utility model is few, and circuit is simple, at low cost.Wherein, signal generating circuit uses
555 timers, pulsewidth and frequency are adjustable, and PWM(pulsewidth modulation may be implemented) and the modulation of PFM(frequency modulation) blower that combines
Speed regulating control, speed regulation effect is good, and then realizes the stepless time adjustment function of DC fan, and without Caton, low noise operation, energy conservation
Environmental protection.
In addition, the temperature sampling circuit prime of the utility model uses Wheatstone bridge equilibrium principle, rear class uses difference
Operational amplification circuit, signal sampling precision is high, and temperature control precision is good.The utility model is by blower starting or stopping control circuit in wind
It realizes that the stalling to DC fan is protected when machine failure or fault, avoids the extension of mechanical disorder.
Detailed description of the invention
Fig. 1 is the utility model DC fan alignment circuit；
Fig. 2 is schematic diagram inside 555 timer of the utility model；
Fig. 3 is logic chart when 555 timer of the utility model works normally.
Specific embodiment
As shown in Figure 1, the utility model discloses a kind of DC fan alignment circuit comprising temperature sampling circuit 1, letter
Number circuit 2 and blower starting or stopping control circuit 3 occurs, circuit 2 and wind occur for the output end connection signal of the temperature sampling circuit 1
Circuit 2 occurs for machine starting or stopping control circuit 3, the output end connection signal of the blower starting or stopping control circuit 3, and electricity occurs for the signal
The output end on road 2 connects DC fan.Wherein, temperature is used to detect current environmental temperature using circuit, and temperature value is converted
For voltage value；Blower starting or stopping control circuit 3 is used to set the temperature value of DC fan work whether to determine signal generating circuit 2
Control signal is exported to DC fan, meanwhile, which is also used to the closing in DC fan failure exception
DC fan；Signal generating circuit 2 exports the modulation of PWM and PFM according to temperature sampling circuit 1 and blower starting or stopping control circuit 3
Square wave is adjusted the speed for DC fan.
Above-mentioned temperature sampling circuit 1 includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance
R7, capacitor C1, negative tempperature coefficient thermistor NTC1 and operational amplifier IC1.The function of the circuit is temperature signal standard
It is true, equal proportion to be converted into voltage signal.
The one end resistance R1 is connected with positive pole VCC, one end and electricity of the other end and negative tempperature coefficient thermistor NTC1
The one end for hindering R5 is connected；The negative tempperature coefficient thermistor NTC1 other end is connected with power cathode GND；The one end resistance R2 and power supply
Positive VCC is connected, and the other end is connected with one end of one end of resistance R3 and resistance R4；The other end and power cathode of resistance R3
GND is connected；The other end of resistance R4 is connected with the backward end of operational amplifier IC1；The other end and operational amplifier of resistance R5
The in-phase end of IC1 is connected with one end of resistance R7；The other end of resistance R7 is connected with power cathode GND；One end of resistance R6 with
The backward end of operational amplifier IC1 is connected, and the other end is connected with the output end of operational amplifier IC1；The one end capacitor C1 and operation
The output end (i.e. the output end of temperature sampling circuit 1) of amplifier IC1 is connected, and the other end is connected with power cathode GND.
Signal generating circuit 2 includes resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, capacitor C2, capacitor
C3, triode Q1 and 555 timer IC3.Wherein, resistance R12, resistance R13, resistance R14, capacitor C2,555 timer IC3
Parameter matching, can be arranged the PWM modulation square wave of output duty cycle and changeable frequency；Triode Q1 is for driving DC fan electric
Source.
The one end resistance R12 is connected with operational amplifier IC1 output end, one end of the other end and resistance R13, resistance R14
One end is connected with the 7th foot of 555 timer IC3；The other end of resistance R13 is connected with positive pole VCC；Resistance R14's is another
End is connected with the 2nd foot, the 6th foot of one end of capacitor C2,555 timer IC3；The other end of capacitor C2 and power cathode GND phase
Even；The 1st foot of 555 timer IC3 is connected with one end of capacitor C3 and power cathode GND；The other end of capacitor C3 and 555 timings
The 5th foot of device IC3 is connected；The 3rd foot of 555 timer IC3 is connected with one end of resistance R16；The other end of resistance R16 and three poles
The B grade of pipe Q1 is connected；The C grade of triode Q1 is connected with positive pole VCC；Triode Q1 E grade (signal generating circuit 2 it is defeated
Outlet) it is connected with the electrode input end of DC fan；The negative input of DC fan is connected with power cathode GND；555 timings
The 8th foot of device IC3 is connected with positive pole VCC；The output end of the 4th foot and resistance R15 and comparator IC2 of 555 timer IC3
It is connected；The other end of resistance R15 is connected with positive pole VCC.
Blower starting or stopping control circuit 3 compares including resistance R8, resistance R9, resistance R10, resistance R11, diode D1, voltage
Device IC2.Wherein, resistance R10, resistance R8, resistance R9, resistance R11, voltage comparator ic 2 cooperate the resistance of signal generating circuit 2
The temperature value of DC fan work can be arranged in R15.
One end of resistance R10 is connected with the output end of operational amplifier IC1, the cathode and voltage of the other end and diode D1
The backward end of comparator IC2 is connected；The anode of diode D1 is connected with DC fan fault-signal；One end of resistance R8 and power supply
Positive VCC is connected, the non-inverting input terminal phase of the other end and one end of resistance R9, one end of resistance R11 and voltage comparator ic 2
Even；The other end of resistance R9 is connected with power cathode GND；Output end (the blower start and stop control of resistance R11 and voltage comparator ic 2
The output end of circuit 3 processed) it is connected.
It with continued reference to Fig. 1 and combines shown in Fig. 2 and Fig. 3, in Fig. 3, VC is the charge waveforms of capacitor C2, and Vo is 555 timings
The logic level of device output pin.The working principle of the alignment circuit of the utility model is as follows:
Negative tempperature coefficient thermistor NTC1 is for detecting current environmental temperature, with resistance R1, resistance R2 and resistance R3 group
At a Wheatstone bridge.When the temperature is low, NCT1 resistance value is high, is amplified by the signal of operational amplifier IC1, by temperature
Value is converted to voltage value.In low temperature, the output voltage of operational amplifier IC1 is relatively high, and the voltage is by resistance R10 to voltage
The reverse input end of comparator IC2, resistance R8 and resistance R9 form the temperature of DC fan work to the partial pressure of power supply VCC
Lower limit reference value is spent, when the reverse input end of voltage comparator ic 2 is higher than non-inverting input terminal, the output of voltage comparator ic 2 is
The 4th foot input of low level (0V), i.e. 555 timer IC3 is low level (0V), and the 3rd foot of 555 timer IC3, i.e., defeated at this time
Foot is often low level (0V) out, then passes through the B grade of resistance R16 to triode Q1, and triode Q1 is not turned at this time, and DC fan is not
Work.
When environment temperature gradually rises, negative tempperature coefficient thermistor NTC1 resistance value reduces, and operational amplifier IC1's is defeated
Enter voltage reduction, the output voltage of operational amplifier IC1 reduces, and passes through the reversed input of resistance R10 to voltage comparator ic 2
End, when the voltage is lower than the non-inverting input terminal of voltage comparator ic 2, the output end of voltage comparator ic 2 exports high level
(VCC), 555 timer IC3 start to work, and the triode shutdown inside the 7th foot of 555 timer IC3, the 7th foot and GND are disconnected
It opens, the output end of operational amplifier IC2 is charged by resistance R12 and resistance R14 to capacitor C2, and VCC passes through resistance R13 and resistance
R14 charges to capacitor C2, and when the voltage on capacitor C2 is higher than 1/3VCC, the 3rd foot of 555 timer IC3 exports high level
(VCC), when the voltage on capacitor C2 is higher than 2/3VCC, the 3rd foot of 555 timer IC3 exports low level (0V), while the 7th
The inside triode ON of foot, the 7th foot are connected to GND, and capacitor C2 is discharged by resistance R14, when the voltage of capacitor C2 be put into it is low
When 1/3VCC, the 3rd foot of 555 timer IC3 exports high level (VCC) again, and the 7th foot and GND are disconnected, and capacitor C2 enters again to be filled
Electric link, the charge and discharge process of capacitor C2 are achieved that the PWM square-wave frequency modulation of the output signal of 555 timer IC3.Capacitor C2's
Charge rate is determined by the output voltage of operational amplifier IC1, resistance R12, resistance R13, resistance R14 and capacitor C2, works as electricity
After the parameter fixation for hindering R12, resistance R13, resistance R14, capacitor C2, change the output voltage of operational amplifier IC1, so that it may change
The charge rate of C2 is held in power transformation, and the discharge rate of capacitor C2 is only related with resistance R14, therefore can change 555 timer IC3
The pulse width and frequency of output signal.Therefore, in normal working conditions, when environment temperature is low, negative temperature coefficient thermistor power
It is high to hinder NTC1 resistance value, operational amplifier IC1 output voltage is high, by resistance R12, resistance R14 to capacitor C2 charge rate just
Fastly, for the output pulse width of 555 timer IC3 with regard to small, pulse frequency is high, and DC fan revolving speed is small；When environment temperature is high, bear
Temperature coefficient thermistor NTC1 resistance value is low, and operational amplifier IC1 output voltage is low, and the charge rate of capacitor C2 is slow, 555 timings
For the output pulse width of device IC3 with regard to big, pulse duration frequency is low, and DC fan revolving speed is fast, increases heat dissipation.
When environment temperature is higher than upper limit value, negative tempperature coefficient thermistor NTC1 resistance value is low, and operational amplifier IC1's is defeated
Voltage is small out, after voltage value is divided with VCC by resistance R12 and resistance R13, so that voltage perseverance is less than 1/3VCC on capacitor C2
When, the 3rd foot output of 555 timer IC3 is often high level (VCC), and triode Q1 keeps constant conduction, and DC fan is transported at full speed
Turn.
When DC fan breaks down or machine other parts break down, a high level is generated to diode D1's
Anode, the cathode voltage of diode D1 are that the failure high level signal of input subtracts the pressure drop of diode D1, work as voltage comparator
When the backward end voltage of IC2 is higher than in-phase end voltage, voltage comparator ic 2 export one low level to the of 555 timer IC3
4 feet, the 3rd foot of 555 timer IC3 at this time, i.e. output pin is often low level (0V), then passes through the B of resistance R16 to triode Q1
Grade, triode Q1 is not turned at this time, to close the speed-regulating signal of DC fan.
To sum up, the utility model it is critical that the DC fan alignment circuit of the utility model is lower in environment temperature
When, close DC fan；When environment temperature increases, by signal generating circuit 2, the modulation of high-frequency, low duty ratio is exported
Square wave, DC fan slow rotation, when environment temperature gradually rises, signal generating circuit 2 being capable of output low frequency rate, high duty
The modulated square wave of ratio, DC fan quick rotation；When temperature is higher than upper limit value, signal generating circuit 2 exports overall height level, directly
Flow fan rotates at full speed.When DC fan breaks down or device inside has other fault-signals to need to close DC fan,
It can achieve the purpose that close DC fan by closing pwm signal.Device used in the alignment circuit is few, and circuit is simple, at
This is low, has both played the stepless time adjustment function of DC fan, realizes and runs without Caton, low noise, while reducing energy consumption, realizes effect
It is good.
The above is only the utility model embodiment, not makees any limit to the technical scope of the utility model
System, thus any trickle amendment made by the above technical examples according to the technical essence of the present invention, equivalent variations with repair
Decorations, are still within the scope of the technical solutions of the present invention.
Claims (3)
1. a kind of DC fan alignment circuit, it is characterised in that: including temperature sampling circuit, signal generating circuit and blower start and stop
Circuit and blower starting or stopping control circuit, the blower occur for the output end connection signal of control circuit, the temperature sampling circuit
Circuit occurs for the output end connection signal of starting or stopping control circuit, and the output end of the signal generating circuit connects DC fan；
The signal generating circuit includes resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, capacitor C2, capacitor
C3, triode Q1 and 555 timer IC3；
The one end the resistance R12 is connected with the output end of temperature sampling circuit, one end of the other end and resistance R13, resistance R14
One end is connected with the 7th foot of 555 timer IC3；The other end of resistance R13 is connected with positive pole VCC；Resistance R14's is another
End is connected with the 2nd foot, the 6th foot of one end of capacitor C2,555 timer IC3；The other end of capacitor C2 and power cathode GND phase
Even；
The 1st foot of the 555 timer IC3 is connected with one end of capacitor C3 and power cathode GND；The other end of capacitor C3 with
The 5th foot of 555 timer IC3 is connected；The 3rd foot of 555 timer IC3 is connected with one end of resistance R16；Resistance R16's is another
End is connected with the B of triode Q1 grade；The C grade of triode Q1 is connected with positive pole VCC；The E grade and DC fan of triode Q1
Electrode input end be connected；The negative input of DC fan is connected with power cathode GND；The 8th foot of 555 timer IC3 with
Positive pole VCC is connected；The 4th foot of 555 timer IC3 is connected with the output end of resistance R15 and blower starting or stopping control circuit；Electricity
The other end of resistance R15 is connected with positive pole VCC.
2. a kind of DC fan alignment circuit according to claim 1, it is characterised in that: the temperature sampling circuit includes
Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, capacitor C1, negative tempperature coefficient thermistor
NTC1 and operational amplifier IC1；
The one end the resistance R1 is connected with positive pole VCC, one end and electricity of the other end and negative tempperature coefficient thermistor NTC1
The one end for hindering R5 is connected；The negative tempperature coefficient thermistor NTC1 other end is connected with power cathode GND；The one end resistance R2 and power supply
Positive VCC is connected, and the other end is connected with one end of one end of resistance R3 and resistance R4；The other end and power cathode of resistance R3
GND is connected；The other end of resistance R4 is connected with the backward end of operational amplifier IC1；The other end and operational amplifier of resistance R5
The in-phase end of IC1 is connected with one end of resistance R7；The other end of resistance R7 is connected with power cathode GND；One end of resistance R6 with
The backward end of operational amplifier IC1 is connected, and the other end is connected with the output end of operational amplifier IC1；The one end capacitor C1 and operation
The output end of amplifier IC1 is connected, and the other end is connected with power cathode GND.
3. a kind of DC fan alignment circuit according to claim 2, it is characterised in that: the blower starting or stopping control circuit
Including resistance R8, resistance R9, resistance R10, resistance R11, diode D1, voltage comparator ic 2；
One end of the resistance R10 is connected with the output end of operational amplifier IC1, the cathode and voltage of the other end and diode D1
The backward end of comparator IC2 is connected；The anode of diode D1 is connected with DC fan fault-signal；One end of resistance R8 and power supply
Positive VCC is connected, the non-inverting input terminal phase of the other end and one end of resistance R9, one end of resistance R11 and voltage comparator ic 2
Even；The other end of resistance R9 is connected with power cathode GND；Resistance R11 is connected with the output end of voltage comparator ic 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821842545.7U CN209145941U (en) | 2018-11-09 | 2018-11-09 | A kind of DC fan alignment circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821842545.7U CN209145941U (en) | 2018-11-09 | 2018-11-09 | A kind of DC fan alignment circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209145941U true CN209145941U (en) | 2019-07-23 |
Family
ID=67271495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821842545.7U Withdrawn - After Issue CN209145941U (en) | 2018-11-09 | 2018-11-09 | A kind of DC fan alignment circuit |
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| CN (1) | CN209145941U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109185212A (en) * | 2018-11-09 | 2019-01-11 | 厦门拓宝科技有限公司 | A kind of DC fan alignment circuit |
-
2018
- 2018-11-09 CN CN201821842545.7U patent/CN209145941U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109185212A (en) * | 2018-11-09 | 2019-01-11 | 厦门拓宝科技有限公司 | A kind of DC fan alignment circuit |
| CN109185212B (en) * | 2018-11-09 | 2024-04-09 | 厦门拓宝科技有限公司 | Speed regulating circuit of direct current fan |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A speed regulating circuit for DC fan Effective date of registration: 20211021 Granted publication date: 20190723 Pledgee: Xiamen Haicang Financing Guarantee Co.,Ltd. Pledgor: TBB POWER (XIAMEN) CO.,LTD. Registration number: Y2021980011106 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20231027 Granted publication date: 20190723 Pledgee: Xiamen Haicang Financing Guarantee Co.,Ltd. Pledgor: TBB POWER (XIAMEN) CO.,LTD. Registration number: Y2021980011106 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190723 Effective date of abandoning: 20240409 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190723 Effective date of abandoning: 20240409 |