CN105257579B - A kind of adjustable speed fan - Google Patents
A kind of adjustable speed fan Download PDFInfo
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- CN105257579B CN105257579B CN201510753889.5A CN201510753889A CN105257579B CN 105257579 B CN105257579 B CN 105257579B CN 201510753889 A CN201510753889 A CN 201510753889A CN 105257579 B CN105257579 B CN 105257579B
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Abstract
The present invention relates to a kind of adjustable speed fan, including single chip control unit and temperature collecting cell, temperature collecting cell connecting fan speed adjustment unit, the fan speed regulation unit input connection temperature collecting cell, export the positive and negative terminals of connecting fan power supply, temperature collecting cell output signal is carried on fan power, with the voltage between the positive and negative terminals for controlling fan power.The present invention is used to solve when collection point is less than overheat protector point, the exceeded problem of some heater members, and control is easy, reliable.
Description
Technical field
The present invention relates to a kind of blower fan, speed governing is carried out according to temperature.
Background technology
As power electronic power device is to the development in high power density direction, the heat in element unit volume is also corresponding
Increase.The electric energy loss of device for power switching is especially protruded in the equipment such as high-power high-frequency communication power supply, this part consumption work(
Rate can be changed into heat raises power device tube core heating, junction temperature, if in time, effectively can not discharge this heat, just
The service behaviour of device is influenced whether, so as to reduce the reliability of system work, or even device is damaged.Therefore thermal design has turned into
A crucial ring of power electronic product design.The effect of thermal design be also directly connected to power electronic equipment can it is normal for a long time,
Stably work.
Blower fan is cooling, the exhaust apparatus commonly used in high frequency switch power, if the blower fan in device normal course of operation
Break down without discovery in time, device will be not enough due to heat-sinking capability, then power attenuation will result in device inside core
Piece active area temperature rises and junction temperature is raised.If junction temperature exceedes the maximum temperature for allowing, chip performance can be caused to reduce, it is reliable
Property reduce, it is impossible to safe and reliable work, when serious can fire hazard or other major accidents, the lighter causes device to be shut down, weight
Person can cause device to be paralysed.
Under blower fan stall or stop state, device continues to keep work, in the temperature meeting slowly of the heater members of device
Rise, occur overheat protector under good situations, then toggled between device busy state and halted state, this situation can be led
Causing device lifetime reduces；If under rigor condition, the temperature of temperature acquisition point is also not reaching to protect point, is generated heat in device serious
Power device or perceptual device will due to temperature raise it is too fast and cause damage, the fire of device may be caused when serious
Calamity.
When device is operated in input low-pressure high-power, output high current, output full power load, output high-voltage great-current etc.
In the case of, the Partial Power device inside device can send substantial amounts of heat, if the temperature according to temperature acquisition point is slowly adjusted
The rotating speed of blower fan, may cause device temperature working range wider, cause the service life of device and reduce.
The content of the invention
It is an object of the invention to provide a kind of adjustable speed fan, it is used to solve, when collection point is less than overheat protector point, to have
The exceeded problem of heater members.
To achieve the above object, the solution of the present invention includes：
A kind of adjustable speed fan, including single chip control unit and temperature collecting cell, temperature collecting cell connecting fan are adjusted
Fast unit, the fan speed regulation unit input connection temperature collecting cell, exports the positive and negative terminals of connecting fan power supply, by temperature
Collecting unit output signal is carried on fan power, with the voltage between the positive and negative terminals for controlling fan power.
The current sense terminal of the adjustable speed fan connects a blower fan stall detection unit, the blower fan stall detection unit
After carrying out level conversion to current sense terminal output signal, single chip control unit is sent into.
The temperature collecting cell is also connected with an over-temperature protection unit, and the signal of temperature collecting cell output is by excess temperature
Single chip control unit is sent into after the comparing of protection location and level conversion.
Single chip control unit control one air-blower control unit of connection, the air-blower control unit includes an electronics
Switch (Q1), the electronic switch (Q1) is connected between power positive end and fan power anode.
The temperature collecting cell includes an operational amplifier (U2B), and fan speed regulation unit includes that a two-stage is amplified
Device, operational amplifier (U2B) output end is connected to the base stage of first order amplifier (V2), the emitter stage of first order amplifier (V2)
Base stage with second level amplifier (V3) is connected, the colelctor electrode of first order amplifier (V2) and the current collection of second level amplifier (V3)
Extremely it is connected, and connects power positive end (VCC), the emitter stage connecting fan power positive end of second level amplifier (V3).
Operational amplifier (U2B) output end is connected with ground connection voltage-stabiliser tube.
In the present invention, the temperature of temperature collecting cell extraction element, then be corresponding magnitude of voltage by temperature transition, then
The fan speed regulation unit of rear end is sent to, carrys out the voltage of linear regulation control rotation speed of fan, and then adjust the rotating speed of blower fan.When
So, it is also possible to or several rotation speed of fan points are set according to temperature voltage value, a value is reached, control the voltage of rotation speed of fan to become
Change a value, realize the purpose of rotation speed of fan gear regulation.
Further, realize that blower fan reaches maximum speed by air-blower control unit, solve in input low-pressure high-power, defeated
When going out high current, output full power load, output high-voltage great-current, blower fan varies with temperature the slow problem of speed governing.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the embodiment of the present invention；
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fan speed regulation control method of the invention includes following link：1) device normally works on power, temperature acquisition
The temperature of unit extraction element, then be corresponding magnitude of voltage by temperature transition, the fan speed regulation unit of rear end is then delivered to, come
The voltage of linear regulation control rotation speed of fan, and then adjust the rotating speed of blower fan.If 2) when temperature voltage value exceedes datum mark,
Over-temperature protection unit exports fault-signal, and this output result is sent into single chip control unit, and then send instructions down stopping
The work of device, until Failure elimination then returns to working condition.If 3) electric current of blower fan stall detection unit detection is more than and sets
Determine reference voltage value, export fault-signal, and this output result is sent to single chip control unit, then send instructions down stopping
The work of device, until Failure elimination then returns to working condition.If 4) single chip control unit detects device and is in input
Under low-voltage high-power, output high current, the output state such as full power and output HIGH voltage high current, send instructions control wind by under
Machine control unit, realizes that blower fan reaches maximum speed.
The present invention is further elaborated with reference to Fig. 2.
Temperature collecting cell：Power supply VCC is connected by resistance R1 with 2 pin of J1,1 pin and resistance R2 and the electric capacity C1 phases of J1
Even, J1 is the temperature value of device sampled point, and corresponding resistance value is ultimately converted to according to the element for using, and temperature is different, J1 phases
Corresponding resistance value is different；Resistance R2 is divider resistance, and electric capacity C1 strobes, at the same both be connected with J1 it is another
End ground connection.1 pin of J1 is connected by resistance R3 with the pin of in-phase input end 5 of amplifier U2B simultaneously, the inverting input of amplifier U2B
It is grounded by resistance R4, resistance R5 is amplifier proportional component, and the pin of output 7 of amplifier U2B is then for device sampled point temperature transition is
The point of magnitude of voltage, is set to A points.
Fan speed regulation unit：A points are connected by resistance R15 with fan speed regulation unit, the other end of R15 and the negative electrode phase of Z1
Even, the anode of Z1 is connected with the negative electrode of Z2, the minus earth of Z2, and Z1 and Z2 is voltage-stabiliser tube, the electricity to entering triode V2 base stages
Pressure carries out amplitude limit, and the emitter stage of V2 is connected with the base stage of V3, and the colelctor electrode of V2 is connected with the colelctor electrode of V3, and by resistance R16
It is connected with power supply VCC, the emitter stage of V3 is connected with 1 pin of one end of electrochemical capacitor E1, the negative electrode of diode D1 and J2, J2's
2 pin are connected with the other end of E1, the anode of diode, herein 1 pin of J2 be fan power just, 2 pin are negative for fan power,
3 pin are blower fan current detecting pin.The magnitude of voltage of A points is different, and the base current for flowing through R15 is different, then flow through the colelctor electrode electricity of R16
Stream is different, so the voltage of 1 pin of J2 and 2 pin is different, then the voltage of A points controls the voltage of blower fan, and then controls blower fan
Rotating speed.
With in upper type, V2 and V3 is linear unit, it is achieved thereby that between fan power end voltage linear change.Make
It is other embodiment, it would however also be possible to employ other linear units are realized.
Fan speed regulation unit will control the voltage of rotation speed of fan according to temperature voltage value come linear regulation, and then adjust wind
The rotating speed of machine, makes, as temperature voltage value is to raise, to realize the purpose that rotation speed of fan is improved；As other embodiment, also may be used
Several rotation speed of fan points are set according to temperature voltage value to design corresponding circuit realiration, a value is reached, rotation speed of fan is controlled
The value of voltage change one, realize the purpose of rotation speed of fan gear regulation, such as realize temperature value ratio using multiple comparators
Compared with realizing rotating speed gear with voltage gear circuit.
Over-temperature protection unit：A points are connected by resistance R6 with over-temperature protection unit, and A points voltage passes through R6 and R7 partial pressures, so
Enter the pin of in-phase input end 3 of amplifier U2A by resistance R8 afterwards；Resistance R10 and R9 carries out partial pressure to power supply VCC, this partial pressure value
As a reference value of overheat protector point, subsequently into the pin of inverting input 2 of amplifier U2A；The output pin 1 of amplifier U2A as than
Relatively result, i.e. OT.During normal work, OT is high voltage, by resistance R13 and the partial pressure of resistance R12, electric capacity C2 filtering, power
Pipe V1 is turned on, then OT_FAULT is low level zero.When excess temperature, OT is low level, and power tube V1 is not turned on, and OT_FAULT passes through
Resistance R14 is connected with power supply VCC1, as high level VCC1.
Blower fan stall detection unit：3 pin of J2 are blower fan current detecting pin, for giving blowing machine current signal, for list
Piece machine judges whether stall.It is connected with power supply VCC by resistance R19, while by resistance R21 and resistance R20 partial pressures, electricity
Hold C4 filtering, into the base stage of triode V5, the emitter stage of V5 is connected to the ground, the colelctor electrode of V5 passes through resistance R22 and power supply
VCC1 is connected.If 3 pin of J3 are low level, V5 is not turned on, and FAN_FAUL is high level VCC1；If 3 pin of J3 are high level,
Then V5 conductings, FAN_FAUL is low level ground.
Air-blower control unit：The control command that FAN_CON is issued for single chip control unit, if FAN_CON is high level,
By resistance R18 and resistance R17 partial pressures, electric capacity C3 filtering, triode V4 is turned on, and the colelctor electrode of V4 is then zero.Meanwhile, the collection of V4
Electrode is connected by resistance R22 with power supply VCC, is connected with power tube Q1 by resistance R23, then Q1 is not turned on, in high-impedance state.
If FAN_CON is low level, triode V4 is not turned on, and then power tube Q1 is turned on, then the voltage of power supply VCC is all added to wind
1 pin and 2 pin of machine, make rotation speed of fan reach maximum.
Used as other embodiment, blower fan, single chip control unit and temperature collecting cell, fan speed regulation unit are can be with
Implement.Over-temperature protection unit, air-blower control unit, blower fan stall detection unit can as needed add as accessory structure
Plus.
Specific embodiment of the present invention is presented above, but the present invention is not limited to described implementation method.
Under the thinking that the present invention is given, using by the way of being readily apparent that to those skilled in the art to the skill in above-described embodiment
Art means enter line translation, replacement, modification, and play a part of with the present invention in relevant art means it is essentially identical, realization
Goal of the invention it is also essentially identical, so formed technical scheme above-described embodiment is finely adjusted to be formed, this technology
Scheme is still fallen within protection scope of the present invention.
Claims (5)
1. a kind of adjustable speed fan, including single chip control unit and temperature collecting cell, it is characterised in that temperature collecting cell connects
Give a dinner for a visitor from afar machine speed adjustment unit, the fan speed regulation unit input connection temperature collecting cell exports the positive and negative terminal of connecting fan power supply
Son, temperature collecting cell output signal is carried on fan power, with the voltage between the positive and negative terminals for controlling fan power；
Single chip control unit control one air-blower control unit of connection, the air-blower control unit includes an electronic switch
(Q1), the electronic switch (Q1) is connected between power positive end and fan power anode, when single chip control unit detects dress
Put under input low-voltage high-power, output high current, output full power and output HIGH voltage current state, bristle with anger by under
Order control air-blower control unit, realizes that blower fan reaches maximum speed.
2. a kind of adjustable speed fan according to claim 1, it is characterised in that the current sense terminal of the adjustable speed fan connects
A blower fan stall detection unit is connect, the blower fan stall detection unit is used to enter current sense terminal output signal line level turn
After changing, single chip control unit is sent into.
3. a kind of adjustable speed fan according to claim 1, it is characterised in that the temperature collecting cell is also connected with a mistake
Warm protection location, the signal of temperature collecting cell output after the comparing of over-temperature protection unit and level conversion by sending into single-chip microcomputer
Control unit.
4. a kind of adjustable speed fan according to claim 1, it is characterised in that the temperature collecting cell includes a computing
Amplifier (U2B), fan speed regulation unit includes a dual-stage amplifier, and operational amplifier (U2B) output end is connected to the first order
The base stage of amplifier (V2), the emitter stage of first order amplifier (V2) is connected with the base stage of second level amplifier (V3), the first order
The colelctor electrode of amplifier (V2) is connected with the colelctor electrode of second level amplifier (V3), and connects power positive end (VCC), the second level
The emitter stage connecting fan power positive end of amplifier (V3).
5. a kind of adjustable speed fan according to claim 4, it is characterised in that operational amplifier (U2B) output end is connected with
Ground connection voltage-stabiliser tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753889.5A CN105257579B (en) | 2015-11-06 | 2015-11-06 | A kind of adjustable speed fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753889.5A CN105257579B (en) | 2015-11-06 | 2015-11-06 | A kind of adjustable speed fan |
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| Publication Number | Publication Date |
|---|---|
| CN105257579A CN105257579A (en) | 2016-01-20 |
| CN105257579B true CN105257579B (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510753889.5A Active CN105257579B (en) | 2015-11-06 | 2015-11-06 | A kind of adjustable speed fan |
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| CN (1) | CN105257579B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109981005A (en) * | 2019-04-02 | 2019-07-05 | 深圳市恩玖科技有限公司 | A kind of DC fan driving circuit and the DC fan using the driving circuit |
| CN112003542B (en) * | 2019-07-18 | 2024-04-02 | 江西瑞华智能科技有限公司 | Fan speed regulation and over-temperature protection circuit based on temperature difference |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201039383Y (en) * | 2007-01-19 | 2008-03-19 | 青岛海信电器股份有限公司 | Self protection fan failure detection circuit and TV set with this circuit |
| CN201546996U (en) * | 2009-12-04 | 2010-08-11 | 泉州市协高微波电子有限公司 | Control circuit of intelligent fan |
| CN202811438U (en) * | 2012-08-04 | 2013-03-20 | 谢安军 | Automatic speed control circuit of fan |
| CN203560130U (en) * | 2013-10-30 | 2014-04-23 | 深圳市晶福源电子技术有限公司 | Control circuit for controlling stepless speed regulation of fan in power supply device |
| CN103790845A (en) * | 2012-10-31 | 2014-05-14 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN204738991U (en) * | 2015-05-28 | 2015-11-04 | 深圳怡化电脑股份有限公司 | Fan control and protection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120161674A1 (en) * | 2010-12-23 | 2012-06-28 | Hsiao-Ping Hung | Dc motor speed controller of a range hood |
-
2015
- 2015-11-06 CN CN201510753889.5A patent/CN105257579B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201039383Y (en) * | 2007-01-19 | 2008-03-19 | 青岛海信电器股份有限公司 | Self protection fan failure detection circuit and TV set with this circuit |
| CN201546996U (en) * | 2009-12-04 | 2010-08-11 | 泉州市协高微波电子有限公司 | Control circuit of intelligent fan |
| CN202811438U (en) * | 2012-08-04 | 2013-03-20 | 谢安军 | Automatic speed control circuit of fan |
| CN103790845A (en) * | 2012-10-31 | 2014-05-14 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN203560130U (en) * | 2013-10-30 | 2014-04-23 | 深圳市晶福源电子技术有限公司 | Control circuit for controlling stepless speed regulation of fan in power supply device |
| CN204738991U (en) * | 2015-05-28 | 2015-11-04 | 深圳怡化电脑股份有限公司 | Fan control and protection circuit |
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| Publication number | Publication date |
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| CN105257579A (en) | 2016-01-20 |
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