CN205977764U - Controlled speed governing circuit of direct current fan - Google Patents
Controlled speed governing circuit of direct current fan Download PDFInfo
- Publication number
- CN205977764U CN205977764U CN201620946591.6U CN201620946591U CN205977764U CN 205977764 U CN205977764 U CN 205977764U CN 201620946591 U CN201620946591 U CN 201620946591U CN 205977764 U CN205977764 U CN 205977764U
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- resistance
- connects
- input
- fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Control Of Positive-Displacement Air Blowers (AREA)
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Abstract
The utility model provides a controlled speed governing circuit of direct current fan, it includes operational amplifier U1A, operational amplifier U1B, operational amplifier U1C and direct current fan socket P1, through operational amplifier U1B with the cable takes place for operational amplifier U1A's constitution triangular wave, the PWM speed governing circuit that operational amplifier U1C constitutes to this control MOS pipe Q1 switches on and then carries out timing control to the direct current fan. This controlled speed governing circuit of direct current fan has design science, the practicality is strong, regulation and control are convenient, low in production cost and the effectual advantage of regulation and control.
Description
Technical field
This utility model is related to a kind of DC fan alignment circuit, specifically, relate to a kind of controlled tune of DC fan
Fast circuit.
Background technology
With scientific and technological fast development, increasing sci-tech product is widely used.Switching Power Supply, charger, computer,
High-power electronic devices such as UPS etc., when work, need DC fan to carry out air blast cooling radiating, ensure equipment with this
Normal work, prevents the accident that apparatus overheat leads to.But, the cooling method commonly used at present is to expire using DC fan length to bear
Lotus runs, and ensures device temperature with this, although this mode has reached cooling purpose, DC fan was chronically at full capacity at that time
Running status, greatly reduces the service life of DC fan, how to regulate and control described DC fan according to the change of device current
It is people's problem demanding prompt solution.
In order to solve with present on problem, people are seeking a kind of preferable technical solution always.
Content of the invention
The purpose of this utility model is for the deficiencies in the prior art, thus providing a kind of design science, practical, tune
Prosecutor just, low production cost and the good controlled alignment circuit of DC fan of regulating effect.
To achieve these goals, this utility model be employed technical scheme comprise that：A kind of DC fan controlled speed governing electricity
Road, it includes operational amplifier U1A, operational amplifier U1B, operational amplifier U1C and DC fan socket P1, described computing
The positive input of amplifier U1B connects bleeder circuit and the negative input of described operational amplifier U1A, described computing respectively
Electric capacity C1, described operational amplifier are set between the outfan of the negative input of amplifier U1B and described operational amplifier U1B
The negative input of U1B connects the outfan of described operational amplifier U1A by resistance R1, and described operational amplifier U1B's is defeated
Go out end and connect one end of resistance R2 and the positive input of described operational amplifier U1A by resistance R4 respectively, described computing is put
The cathode node connection power supply of big device U1A, the negative pole node ground connection of described operational amplifier U1A, the other end of described resistance R2
Connect the outfan of described operational amplifier U1A, the outfan of described operational amplifier U1B connects one end of resistance R6, described
The other end of resistance R6 connects one end of resistance R9 and the negative input of described operational amplifier U1C, described resistance R9 respectively
The other end ground connection, the positive input of described operational amplifier U1C as current signal input, described operational amplifier
The outfan of U1C connects one end of resistance R8 and the grid of metal-oxide-semiconductor Q1 respectively by resistance R7, and the other end of described resistance R8 is even
One end of connecting resistance R10 and the source electrode of described metal-oxide-semiconductor Q1, the other end ground connection of described resistance R10, the drain electrode of described metal-oxide-semiconductor Q1
Connect the input of described DC fan socket P1, the input of described DC fan socket P1 is also associated with fan power supply.
Based on above-mentioned, described bleeder circuit includes resistance R3, resistance R5 and electric capacity C2, and one end of described resistance R3 is as electricity
Source input, the other end of described resistance R3 connects one end of described resistance R5 and the forward direction of described operational amplifier U1B respectively
Input, described electric capacity C2 is simultaneously connected to the two ends of described resistance R5, the other end ground connection of described resistance R5.
This utility model hinge structure has substantive distinguishing features and progress, and specifically, this utility model is using fortune
Calculate amplifier U1B, described operational amplifier U1A and operational amplifier U1C etc. and constitute alignment circuit, according to described operational amplifier
The current signal that U1C receives, carries out the speed regulation of whole DC fan, both ensure that cooling, prevent DC fan long simultaneously
Expired load running；So that whole DC fan carries out the adjustment of rotating speed according to the change of device current information；It has design
Science, practical, regulation and control are convenient, low production cost and the good advantage of regulating effect.
Brief description
Fig. 1 is structural representation of the present utility model.
Specific embodiment
Below by specific embodiment, the technical solution of the utility model is described in further detail.
As shown in figure 1, a kind of controlled alignment circuit of DC fan, can be used in various needing setting of DC fan cooling
Standby, using this alignment circuit, real-time control is carried out to DC fan, prevent DC fan to be chronically at full load state, Jin Erti
The service life of high DC fan.
Specifically：The controlled alignment circuit of this DC fan it include operational amplifier U1A, operational amplifier U1B, computing
Amplifier U1C and DC fan socket P1, and then constitute comparison circuit, described DC fan socket P1 connects DC fan, with
This powers and completes the control of DC fan.
The positive input of described operational amplifier U1B connects the negative of bleeder circuit and described operational amplifier U1A respectively
To input, bleeder circuit described in the present embodiment includes resistance R3, resistance R5 and electric capacity C2, one end conduct of described resistance R3
By this film input, power input VCC_12V, thinks that whole circuit is powered, the other end of described resistance R3 connects respectively
Connect one end of described resistance R5 and the positive input of described operational amplifier U1B, described electric capacity C2 is simultaneously connected to described resistance
The two ends of R5, the other end ground connection of described resistance R5；The negative input of described operational amplifier U1B and described operational amplifier
Electric capacity C1 is set between the outfan of U1B, and the negative input of described operational amplifier U1B connects described computing by resistance R1
The outfan of amplifier U1A, the outfan of described operational amplifier U1B connects one end and the institute of resistance R2 respectively by resistance R4
State the positive input of operational amplifier U1A, the cathode node connection power supply of described operational amplifier U1A, described operation amplifier
The negative pole node ground connection of device U1A, the other end of described resistance R2 connects the outfan of described operational amplifier U1A.
The outfan of described operational amplifier U1B connects one end of resistance R6, conveys comparison signal with this, described resistance R6
The other end connect one end of resistance R9 and the negative input of described operational amplifier U1C respectively, described resistance R9's is another
End ground connection, the positive input of described operational amplifier U1C as current signal input Iv, by this current signal input
The current signal of the additional input of Iv, the outfan of described operational amplifier U1C connects one end of resistance R8 respectively by resistance R7
With the grid of metal-oxide-semiconductor Q1, other end connection one end of resistance R10 of described resistance R8 and the source electrode of described metal-oxide-semiconductor Q1, described electricity
The other end ground connection of resistance R10, the drain electrode of described metal-oxide-semiconductor Q1 connects the input of described DC fan socket P1, described direct current wind
The input of fan socket P1 is also associated with fan power supply VCC_S.
When specifically used：After start, by described resistance R3 and described resistance R5 partial pressure, described electric capacity C2 filtering produces benchmark
Voltage, reference voltage is connected to the negative input of described operational amplifier U1A；Described operational amplifier U1A and described resistance R2
Composition hysteresis loop comparator, described operational amplifier U1B and described electric capacity C1 composition integrating circuit, the output of comparator is as integration
The input of circuit, the output input as hysteresis loop comparator again of integrating circuit, finally in the output of described operational amplifier U1B
End produces a triangular wave.Then this triangular wave delivers to described operation amplifier after described resistance R6 and described R9 series connection partial pressure
The negative input of device U1C, the positive input external dc control signal of described operational amplifier U1C（Such as:Charger fills
Electric current signal）.Then the height according to this DC control signal changes, the outfan output one of described operational amplifier U1C
The individual pwm signal with DC control signal change, is controlled the ON time of described metal-oxide-semiconductor Q1 by this pwm signal, thus realizing straight
The speed governing of flow fan.
Concrete control methods are as follows：When the voltage of the positive input of described operational amplifier U1C is put higher than described computing
During the triangle crest value of negative input of big device U1C, the outfan output permanent High level of described operational amplifier U1C.When
The triangular wave of the negative input in described operational amplifier U1C for the magnitude of voltage of the positive input of described operational amplifier U1C
During intermediate value, the outfan output duty cycle of described operational amplifier U1C is 50% P square-wave signal.When described operational amplifier
When the voltage of the positive input of U1C is less than the triangle crest value of negative input of described operational amplifier U1C, described computing
The outfan output of amplifier U1C continues low level signal.The speed governing of DC fan is realized with this.
Resistance R7 described in the present embodiment is the driving resistance of metal-oxide-semiconductor Q1, and described resistance R8 can ensure that for pull down resistor
Metal-oxide-semiconductor Q1 will not surprisingly turn on, and described resistance R10 is insurance resistance, prevents from damaging metal-oxide-semiconductor Q1 during blower fan short circuit.
Finally it should be noted that:Above example is only in order to illustrate the technical solution of the utility model rather than it is limited
System；Although being described in detail to this utility model with reference to preferred embodiment, those of ordinary skill in the art should
Understand：Still specific embodiment of the present utility model can be modified or some technical characteristics are carried out with equivalent replacing
Change；Without deviating from the spirit of technical solutions of the utility model, it all should cover the technical scheme being claimed in this utility model
In the middle of scope.
Claims (2)
1. a kind of controlled alignment circuit of DC fan it is characterised in that：It include operational amplifier U1A, operational amplifier U1B,
The positive input of operational amplifier U1C and DC fan socket P1, described operational amplifier U1B connect respectively bleeder circuit and
The negative input of described operational amplifier U1A, the negative input of described operational amplifier U1B and described operational amplifier
Electric capacity C1 is set between the outfan of U1B, and the negative input of described operational amplifier U1B connects described computing by resistance R1
The outfan of amplifier U1A, the outfan of described operational amplifier U1B connects one end and the institute of resistance R2 respectively by resistance R4
State the positive input of operational amplifier U1A, the cathode node connection power supply of described operational amplifier U1A, described operation amplifier
The negative pole node ground connection of device U1A, the other end of described resistance R2 connects the outfan of described operational amplifier U1A, described computing
The outfan of amplifier U1B connects one end of resistance R6, and the other end of described resistance R6 connects one end and the institute of resistance R9 respectively
State the negative input of operational amplifier U1C, the other end ground connection of described resistance R9, the forward direction of described operational amplifier U1C is defeated
Enter end as current signal input, the outfan of described operational amplifier U1C connects the one of resistance R8 respectively by resistance R7
End and the grid of metal-oxide-semiconductor Q1, the other end of described resistance R8 connects one end of resistance R10 and the source electrode of described metal-oxide-semiconductor Q1, described
The other end ground connection of resistance R10, the drain electrode of described metal-oxide-semiconductor Q1 connects the input of described DC fan socket P1, described direct current
The input of fan socket P1 is also associated with fan power supply.
2. the controlled alignment circuit of DC fan according to claim 1 it is characterised in that：Described bleeder circuit includes resistance
R3, resistance R5 and electric capacity C2, as power input, the other end of described resistance R3 connects institute respectively for one end of described resistance R3
State one end of resistance R5 and the positive input of described operational amplifier U1B, described electric capacity C2 is simultaneously connected to described resistance R5's
Two ends, the other end ground connection of described resistance R5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620946591.6U CN205977764U (en) | 2016-08-26 | 2016-08-26 | Controlled speed governing circuit of direct current fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620946591.6U CN205977764U (en) | 2016-08-26 | 2016-08-26 | Controlled speed governing circuit of direct current fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205977764U true CN205977764U (en) | 2017-02-22 |
Family
ID=58035690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620946591.6U Expired - Fee Related CN205977764U (en) | 2016-08-26 | 2016-08-26 | Controlled speed governing circuit of direct current fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205977764U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108227563A (en) * | 2017-12-13 | 2018-06-29 | 苏州长风航空电子有限公司 | A kind of method that pwm signal is generated by oscillation |
-
2016
- 2016-08-26 CN CN201620946591.6U patent/CN205977764U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108227563A (en) * | 2017-12-13 | 2018-06-29 | 苏州长风航空电子有限公司 | A kind of method that pwm signal is generated by oscillation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105910226A (en) | Air conditioner outdoor unit, air conditioner and control method of air conditioner | |
| CN104901385A (en) | Generator energy management device and power generation system | |
| CN203481855U (en) | Portable power supply device | |
| CN205977764U (en) | Controlled speed governing circuit of direct current fan | |
| CN206442289U (en) | A kind of Switching Power Supply low-power consumption fast start circuit | |
| CN204836118U (en) | Energy -saving control circuit and row of inserting thereof | |
| CN204103591U (en) | A kind of ambulance-mounted supply unit | |
| CN203299563U (en) | Low-power-consumption standby circuit and air-conditioner including same | |
| CN206759350U (en) | A kind of shutdown decompression protection device of permagnetic synchronous motor | |
| CN203289174U (en) | Full-automatic large-power LED lamp power supply circuit | |
| CN206475754U (en) | A kind of new double source trolleybus control system | |
| CN103375850B (en) | Portable air conditioner | |
| CN104868543B (en) | A kind of intelligent battery charger of wide input voltage range | |
| CN105337320A (en) | Dynamic current charging method and circuit | |
| CN205670689U (en) | A kind of charging circuit of remote controller | |
| CN209748018U (en) | Solar heat dissipation device of low-voltage power metering box | |
| CN209217701U (en) | Low-voltage alternating-current electric machine controller over-pressure safety device | |
| CN208996983U (en) | Blowing device | |
| CN207410318U (en) | Improve the exciting circuit of power field effect pipe driving voltage | |
| CN205647186U (en) | Protection type hybrid power generation system | |
| CN206250837U (en) | The freewheeling circuit of intelligent electric meter and its wireless communication module | |
| CN206498247U (en) | New trend controller with power supply automatic switchover circuit | |
| CN205646981U (en) | Mix and trigger power generation system | |
| CN204928143U (en) | Outdoor type active power filter who possesses timesharing energy storage function | |
| CN201528217U (en) | On-line emergency power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170222 Termination date: 20170826 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |