CN203685630U - Automatic temperature control fan speed control system - Google Patents
Automatic temperature control fan speed control system Download PDFInfo
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- CN203685630U CN203685630U CN201320546096.2U CN201320546096U CN203685630U CN 203685630 U CN203685630 U CN 203685630U CN 201320546096 U CN201320546096 U CN 201320546096U CN 203685630 U CN203685630 U CN 203685630U
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Abstract
The utility model provides an automatic temperature control fan speed control system for automatically adjusting the fan speed according to the ambient temperature. The system comprises a temperature detection module, a comparison module and an electronic switch. The comparison module is used for comparing voltage signals output by the temperature detection module with reference voltage. When the voltage signals are lower than the reference voltage, the comparison module outputs a turn-on signal, and the electronic switch is turned on to bypass the voltage signals output by the temperature detection module to the ground, so that the voltage signals received by a fan are zero, and thus the fan does not work. Conversely, the comparison module outputs a cut-off signal, and the electronic switch is turned off to remove the state that the voltage signals are bypassed to the ground is removed, so that the fan receives the voltage signals output by the temperature detection module, and the rotating speed of the fan is adjusted according to the voltage size of the voltage signals. The rotating speed of the fan can be controlled according to the ambient temperature, so that the noise and power consumption are reduced, and the service life of the fan is effectively prolonged.
Description
Technical field
The utility model relates to fan speed-regulating field, particularly relates to a kind of automatic temperature-controlled fan speed regulation system.
Background technique
In a lot of electronic equipments, (such as medical equipment, computer, communication product, photovoltaic, consumption electronic product, vehicle electronics, exchanger etc.) all need to carry out radiating and cooling with fan at present.In traditional instrument, be provided with temperature sensing circuit, when every day use, fan is in closed condition.Just open fan full speed running when the temperature rise of instrument internal space environment during to set temperature control point, the heat in instrument internal space is taken to instrument outside, thereby reach the effect of radiating and cooling.When the running state from fan can be found out, be also two actions of simple opening and closing to the control of fan, according to the situation of instrument internal space environment temperature, rotation speed of the fan is not reasonably controlled.And the fan noise of like this full speed running can be very large, sound very irritated, affect mood, power consumption also can be very large, makes energy utilization rate reduction.Meanwhile, because rotation speed of the fan is not controlled scientifically and rationally, can badly influence like this working life of fan, reduce the performance of fan, even be easy to damage fan, thereby have influence on the good operation of whole electronic equipment system.
Model utility content
Based on this, be necessary for the problems referred to above, a kind of automatic temperature-controlled fan speed regulation system that can automatically regulate rotation speed of the fan according to the ambient temperature of electronic equipment inside is provided.
A kind of automatic temperature-controlled fan speed regulation system, for automatically regulating rotation speed of the fan according to ambient temperature, comprise: temperature detecting module, comprise temperature transducer, described temperature detecting module is for detection of ambient temperature, temperature signal is converted into voltage signal and exports fan to, and the voltage swing of described voltage signal changes with the variation of described temperature signal, and described fan is adjusted described rotation speed of the fan according to the voltage swing of described voltage signal; Comparison module, comprise comparator, described comparison module and described temperature detecting module are electrically connected, for the output voltage signal of described temperature detecting module and reference potential are compared, the voltage signal of described temperature detecting module output is during lower than described reference potential, described comparison module is exported a Continuity signal, on the contrary output one pick-off signal; And electronic switch, the control end of described electronic switch and the output terminal of described comparison module are electrically connected, the input end of described electronic switch and described fan are electrically connected, the output head grounding of described electronic switch, the conducting in the time receiving described Continuity signal of described electronic switch, the voltage signal of described temperature detecting module output switches to ground by the output terminal of described electronic switch, thereby the voltage signal that described fan receives is zero not work; Described electronic switch ends in the time receiving described pick-off signal, remove described voltage signal switch to ground state.
In an embodiment, described temperature detecting module also comprises filter capacitor therein, and the input end of described temperature transducer is connected respectively and after filter capacitor, is electrically connected and ground connection with the grounding end of described temperature transducer described in one with output terminal.
Therein in an embodiment, also comprise amplification module, described amplification module comprises operational amplifier, the first divider resistance and feedback resistance, the inverting input of described operational amplifier connect with the first divider resistance after ground connection, described feedback resistance is series between described inverting input and the output terminal of described operational amplifier, and the in-phase input end of described operational amplifier and the output terminal of described temperature detecting module are electrically connected.
In an embodiment, between the output terminal of described amplification module and the input end of described electronic switch, be also provided with current-limiting resistance therein.
Therein in an embodiment, described comparison module also comprises the second divider resistance and the 3rd divider resistance, the in-phase input end of the described comparator ground connection after described the second divider resistance of connecting, described the 3rd divider resistance is series between the power end and in-phase input end of described comparator, and described inverting input is connected in the output terminal of described temperature detecting module.
Therein in an embodiment, described electronic switch is NMOS pipe, and the grid of described NMOS pipe is connected in the output terminal of described comparator, source class ground connection, drain electrode and is connected with the output terminal of described operational amplifier.
In an embodiment, also comprise time delay module therein, in the time that the signal of described comparison module output changes Continuity signal into by pick-off signal, make Continuity signal described in described NMOS pipe delay acquisition.
In an embodiment, described Continuity signal is high level signal therein, and described pick-off signal is low level signal.
Therein in an embodiment, described time delay module comprises time delay resistance and delay capacitor, described time delay resistance is connected between the output terminal of described comparison module and the control end of described electronic switch, and described delay capacitor one end connects the control end of described electronic switch, the other end ground connection.
Therein in an embodiment, described time delay module also comprises switching diode, described switching diode is in parallel with described time delay resistance, and the positive pole of described switching diode is connected with the control end of described electronic switch, and negative pole is connected with the output terminal of described comparison module.
Above-mentioned automatic temperature-controlled fan speed regulation system, by voltage signal and the reference potential of temperature detecting module output are compared, when described voltage signal is during lower than reference potential, comparison module is exported a Continuity signal, thereby the voltage signal of temperature detecting module output is switched to ground by electronic switch conducting, the voltage signal that fan receives is zero, thereby does not work.Otherwise described comparison module is exported a pick-off signal, electronic switch cut-off, fan receives the voltage signal of temperature detecting module output, and according to the voltage swing of voltage signal, rotation speed of the fan is adjusted.The utility model can be controlled according to ambient temperature the rotating speed of fan, has reduced noise and power consumption, can effectively extend the working life of fan.
Brief description of the drawings
Fig. 1 is the circuit block diagram of automatic temperature-controlled fan speed regulation system in an embodiment;
Fig. 2 is the circuit theory diagrams of automatic temperature-controlled fan speed regulation system in an embodiment.
Embodiment
For feature and advantage of the present utility model can more be become apparent, below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
As shown in Figure 1, a kind of automatic temperature-controlled fan speed regulation system, for automatically adjusting to the rotating speed of fan according to ambient temperature.This automatic temperature-controlled fan speed regulation system comprises temperature detecting module 110, amplification module 120, comparison module 130, time delay module 140 and electronic switch 150.
The control end of electronic switch 150 and time delay module 140 are electrically connected, and the output terminal of the input end of electronic switch 150 and amplification module 120 is electrically connected, the output head grounding of electronic switch 150.Electronic switch 150 conducting in the time receiving the Continuity signal that comparison module 130 exports.The control signal that amplification module 120 is exported switches to ground by the output terminal of electronic switch 150, thereby the control signal that fan 200 receives is zero not work.Electronic switch 150 ends in the time of the pick-off signal of the comparison module output receiving, remove the state that voltage signal switches to ground, fan 200 receives the control signal that amplification module 120 is exported, and according to the voltage swing of this control signal, fan 200 rotating speeds is adjusted.
Below in conjunction with Fig. 2, this automatic temperature-controlled fan speed regulation system is described in further detail.
In the present embodiment, temperature transducer U1 is powered separately by power supply VC6 place branch road 112, and its supply voltage is+5V.The model of temperature transducer U1 is LM35, and the first filter capacitor C1 and the second filter capacitor C2 are 0.1 μ F/25V, and the power supply VC1 of temperature detecting module 110 is+5V.
Particularly, the linear ratio K amplifying of operational amplifier U2 is determined by the first divider resistance R2 and feedback resistance R3: K=1+R3/R2., control signal VT is: VT=K*Vt.Voltage signal Vt that amplification module 120 is exported temperature detecting module 110 is linear amplify after, be output as control signal VT, and end at electronic switch 150 time be input to the control end of fan connector 160.Can effectively improve like this precision of adjusting, the rotating speed of fan 200 and ambient temperature are adapted.In the present embodiment, operational amplifier U2 is dual operational amplifier, and its model is LM358D.The resistance of feedback resistance R3 is 220K Ω, and the resistance of the first divider resistance R2 is 15K Ω.In other embodiments, the resistance of feedback resistance R3 and the first divider resistance R2 can be adjusted by magnification ratio according to actual needs.The power supply VC2 of amplification module 120 is+12V.
Output terminal in the module 110 of temperature detection is also in series with the first Zero-ohm resistor R1, and for test process, for convenience of disconnecting with other modules, in other embodiment, this first Zero-ohm resistor also can omit.
Particularly, the inverting input of comparator U3 receives the voltage signal Vt that temperature detecting module 110 is exported, and the reference voltage V Tref of itself and in-phase input end is compared.If voltage signal Vt is lower than reference voltage V Tref, comparison module 130 is exported a Continuity signal, controls electronic switch 150 conductings.Otherwise comparison module 130 is exported a pick-off signal, electronic switch 150 is in cut-off state.In the present embodiment, the Continuity signal that comparison module 130 is exported is high level signal, and pick-off signal is low level signal.The power supply VC3 of comparison module 130 is+12V, and the second divider resistance R4 is 4.7K Ω, and the 3rd divider resistance R5 is 100K Ω, and reference voltage V Tref is 540 millivolts, and the temperature at corresponding temperature control point is 54 DEG C.Comparator U3 is dual operational amplifier, and its model is LM358D.In other embodiment, also can carry out type selecting to above-mentioned instrument as the case may be.
The control end of electronic switch 150 and the positive pole that is connected in switching diode D1, the output terminal of input end and amplification module 120 forms node a, and be connected the output head grounding of electronic switch 150 with the power input VC4 of electronic switch 150 by a pull-up resistor R10.In the present embodiment, electronic switch 150 is NMOS pipe, and its control end is the grid of NMOS pipe, and input end is the drain electrode of NMOS pipe, and output terminal is the source class of NMOS pipe.The model of this NMOS pipe is 2N7002LT1G.The voltage VC4 of electronic switch is+12V that pull-up resistor R10 is 10K Ω.
The control signal VT that the control end reception amplification module 120 of fan connector 160 is exported also adjusts the rotating speed of fan 200 according to this control signal VT.Power end meets power supply VC5.In the present embodiment, the power end of fan connector 160 and control end are connected to respectively the second Zero-ohm resistor R8 and the 3rd Zero-ohm resistor R9, disconnect for convenience for test process with other parts.In other embodiment, these two Zero-ohm resistors also can omit.The model of fan connector 160 is B3B-PH-K-S.
In the present embodiment, circuit working process is as follows: when normal, while being ambient temperature lower than default temperature control point, the voltage signal Vt that temperature detecting module 110 is exported is lower than reference voltage V Tref, comparator U3 exports a high level signal, switching diode D1 oppositely ends, and makes the conducting of NMOS pipe.After the conducting of NMOS pipe, the control signal VT of operational amplifier U2 output is bypassed to ground.The control signal that now control end of fan connector 160 receives is zero, thereby the rotating speed of control fan 200 is zero, and fan 200 does not carry out work.
When ambient temperature rises to temperature control point when above, the voltage signal Vt that temperature detecting module 110 is exported is higher than reference voltage V Tref.Now comparator U3 exports a low level signal, makes switching diode D1 forward conduction, and the grid level of NMOS pipe is dragged down rapidly, and NMOS manages cut-off.The control signal VT of operational amplifier U2 output is input to the control end of fan connector 160, and control fan 200 and open, and according to the rotating speed of the voltage swing control fan 200 of control signal VT.Due to the existence of switching diode D1, the grid voltage of NMOS pipe can drag down rapidly, and just conducting need not slowly discharge into the cut-in voltage of NMOS pipe by time delay resistance R7 and delay capacitor C3 time.Can effectively ensure that like this fan 200, opens rapidly during higher than setting temperature control point in ambient temperature, protection electronic equipment, extends working life of electronic equipment.
In the present embodiment, when fan 200 starts to rotate, not full speed is rotated, and while only having temperature to continue to rise, the voltage of the voltage signal Vt(Vt that fan 200 can be exported according to controlling temperature sensor U1 is with temperature rise) increase rotating speed, thus lower noise.Rotating speed and the ambient temperature of fan 200 adapt, and while avoiding temperature not high, fan 200, still for rotating at full speed, effectively reduces power consumption.Therefore also can effectively extend the life-span of fan 200.
When ambient temperature slowly declines, while dropping to below temperature control point, the voltage signal Vt that temperature detecting module 110 is exported is lower than reference voltage V Tref.Now, comparator U3 exports a high level signal.Now switching diode D1 oppositely ends, and circuit can only slowly charge by time delay resistance R7 and delay capacitor C3.In the time that the voltage at delay capacitor C3 two ends rises to the cut-in voltage of NMOS pipe, the conducting of NMOS pipe, switches to ground the control signal VT of operational amplifier U2 output, and fan 200 just can cut out.By the delay function of time delay module 140, can realize the time-delay closing of fan 200, can make like this ambient temperature of electronic equipment internal really be reduced to below temperature control point, fan 200 just quits work, can avoid fan 200 to stop rotating again for a moment, increase unnecessary power consumption.
In the present embodiment, between the output terminal of operational amplifier U2 and node a, be also in series with current-limiting resistance R6.Output stage in operational amplification circuit is all generally to recommend output, and output current is larger.In the time of the conducting of NMOS pipe, the control signal VT of operational amplifier U2 output is switched to ground by NMOS pipe, and electric current is crossed conference and brought larger power consumption, and current-limiting resistance R6 can make this electric current not too large and lower power consumption.
This system can be used for various need to carrying out and, in the electronic equipment of radiating and cooling, comprises medical equipment, computer, communication product and photovoltaic etc., especially in monitor.
The above embodiment has only expressed several mode of execution of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. an automatic temperature-controlled fan speed regulation system, for automatically regulating rotation speed of the fan according to ambient temperature, comprising:
Temperature detecting module, comprise temperature transducer, described temperature detecting module is for detection of ambient temperature, temperature signal is converted into voltage signal and exports fan to, the voltage swing of described voltage signal changes with the variation of described temperature signal, and described fan is adjusted described rotation speed of the fan according to the voltage swing of described voltage signal;
Comparison module, comprise comparator, described comparison module and described temperature detecting module are electrically connected, for voltage signal and the reference potential of described temperature detecting module output are compared, the voltage signal of described temperature detecting module output is during lower than described reference potential, described comparison module is exported a Continuity signal, on the contrary output one pick-off signal; And
Electronic switch, the control end of described electronic switch and the output terminal of described comparison module are electrically connected, the input end of described electronic switch and described fan are electrically connected, the output head grounding of described electronic switch, the conducting in the time receiving described Continuity signal of described electronic switch, the voltage signal of described temperature detecting module output switches to ground by the output terminal of described electronic switch, thereby the voltage signal that described fan receives is zero not work; Described electronic switch ends in the time receiving described pick-off signal, remove described voltage signal switch to ground state.
2. automatic temperature-controlled fan speed regulation system according to claim 1, it is characterized in that, described temperature detecting module also comprises filter capacitor, and the input end of described temperature transducer is connected respectively and after filter capacitor, is electrically connected and ground connection with the grounding end of described temperature transducer described in one with output terminal.
3. automatic temperature-controlled fan speed regulation system according to claim 1, it is characterized in that, also comprise amplification module, described amplification module comprises operational amplifier, the first divider resistance and feedback resistance, the inverting input of described operational amplifier connect with the first divider resistance after ground connection, described feedback resistance is series between described inverting input and the output terminal of described operational amplifier, and the in-phase input end of described operational amplifier and the output terminal of described temperature detecting module are electrically connected.
4. automatic temperature-controlled fan speed regulation system according to claim 3, is characterized in that, between the output terminal of described amplification module and the input end of described electronic switch, is also provided with current-limiting resistance.
5. automatic temperature-controlled fan speed regulation system according to claim 1, it is characterized in that, described comparison module also comprises the second divider resistance and the 3rd divider resistance, the in-phase input end of the described comparator ground connection after described the second divider resistance of connecting, described the 3rd divider resistance is series between the power end and in-phase input end of described comparator, and described inverting input is connected in the output terminal of described temperature detecting module.
6. automatic temperature-controlled fan speed regulation system according to claim 1, is characterized in that, described electronic switch is NMOS pipe, and the grid of described NMOS pipe is connected in the output terminal of described comparator, source class ground connection, drain electrode and is connected with described fan.
7. automatic temperature-controlled fan speed regulation system according to claim 6, is characterized in that, also comprises time delay module, in the time that the signal of described comparison module output changes Continuity signal into by pick-off signal, makes Continuity signal described in described NMOS pipe delay acquisition.
8. according to the automatic temperature-controlled fan speed regulation system described in claim 1 or 7, it is characterized in that, described Continuity signal is high level signal, and described pick-off signal is low level signal.
9. automatic temperature-controlled fan speed regulation system according to claim 7, it is characterized in that, described time delay module comprises time delay resistance and delay capacitor, described time delay resistance is connected between the output terminal of described comparison module and the control end of described electronic switch, described delay capacitor one end connects the control end of described electronic switch, the other end ground connection.
10. automatic temperature-controlled fan speed regulation system according to claim 9, it is characterized in that, described time delay module also comprises switching diode, described switching diode is in parallel with described time delay resistance, the positive pole of described switching diode is connected with the control end of described electronic switch, and negative pole is connected with the output terminal of described comparison module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320546096.2U CN203685630U (en) | 2013-09-03 | 2013-09-03 | Automatic temperature control fan speed control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320546096.2U CN203685630U (en) | 2013-09-03 | 2013-09-03 | Automatic temperature control fan speed control system |
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| CN203685630U true CN203685630U (en) | 2014-07-02 |
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| CN201320546096.2U Expired - Lifetime CN203685630U (en) | 2013-09-03 | 2013-09-03 | Automatic temperature control fan speed control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108317736A (en) * | 2018-01-31 | 2018-07-24 | 成都美太智创科技有限公司 | The water heater and its control circuit and method of a kind of high energy efficiency low noise two fans |
| CN109462338A (en) * | 2018-10-25 | 2019-03-12 | 张家港市华为电子有限公司 | A kind of DC-DC converter |
| CN113864217A (en) * | 2021-09-10 | 2021-12-31 | 北京市农林科学院信息技术研究中心 | Fan speed regulation method and system |
-
2013
- 2013-09-03 CN CN201320546096.2U patent/CN203685630U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108317736A (en) * | 2018-01-31 | 2018-07-24 | 成都美太智创科技有限公司 | The water heater and its control circuit and method of a kind of high energy efficiency low noise two fans |
| CN109462338A (en) * | 2018-10-25 | 2019-03-12 | 张家港市华为电子有限公司 | A kind of DC-DC converter |
| CN113864217A (en) * | 2021-09-10 | 2021-12-31 | 北京市农林科学院信息技术研究中心 | Fan speed regulation method and system |
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Granted publication date: 20140702 |
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| CX01 | Expiry of patent term |