CN2672330Y - Radiator capable of changing fan speed according to temperature - Google Patents
Radiator capable of changing fan speed according to temperature Download PDFInfo
- Publication number
- CN2672330Y CN2672330Y CN 03205364 CN03205364U CN2672330Y CN 2672330 Y CN2672330 Y CN 2672330Y CN 03205364 CN03205364 CN 03205364 CN 03205364 U CN03205364 U CN 03205364U CN 2672330 Y CN2672330 Y CN 2672330Y
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- fan
- resistance
- temperature
- sink
- voltage
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Abstract
The utility model relates to a heat dissipating device which comprises a voltage regulator, a fan, an integrating circuit, a first resistor, a second resistor and a thermistor, wherein, the voltage regulator is used for providing a reference voltage. The fan is provided with a power supply end which is connected to the reference voltage by the first resistor and a feedback end used for outputting a pulse signal of the rotary speed of the fan. The second resistor is connected between the reference voltage and an earth connecting point. The integrating circuit is used for conversing the pulse signal delivered from the feedback end to a voltage signal. The thermistor is connected between an output end of the integrating circuit and the reference voltage to detect temperature change further to adjust the rotary speed of the fan.
Description
Technical field
The invention provides a kind of sink, particularly a kind of can be with the sink of temperature change rotation speed of the fan.
Background technique
Common sink comprises radiating fin and fan.The material of radiating fin nearly all adopts aluminum alloy at present, and minority is used other materials, but heat-conducting effect can't differ too many.Except the difference on the material, the quality of a radiating fin depends on the size of its surface area, and radiating fin mainly is the surface that conducts heat to radiating fin, is absorbed by flow air and takes away, so the area that radiating fin contacts with air is many more, radiating effect is good more.Yet if atmosphere draught-free, the surface area of radiating fin is greatly also of no use again, so good radiating effect will be arranged, except the dress radiating fin, it is very important installing fan help air ventilation additional.In general, the fan of identical size, its rotating speed are higher, and radiating effect mainly be that the throughput that is driven is bigger because the rotating speed of fan is higher, but this moment, the flow air faster absorption was taken away heat better.The rotating speed of fan can be rough the consumed power by fan learn, the consumed power big fan of healing, rotating speed is just faster certainly.
Please refer to Fig. 1, Fig. 1 is the schematic representation of known sink 10.Sink 10 comprises a Temperature Detector 12, a microcontroller 14, one drive circuit 16 and a fan 18.Annexation between each element of sink 10 as shown in Figure 1, usually sink 10 is installed in the system, Temperature Detector 12 is used for detecting the temperature of this system, microcontroller 14 compares Temperature Detector 12 measured temperature and preset temperatures, when the temperature that records surpassed this preset temperature, drive circuit 16 will start fan 18 runnings.Drive circuit 16 can be controlled the rotating speed of fan 18 according to the different big or small voltages of requirement output of microcontroller 14, and fan 18 has a signaling line, is connected to drive circuit 16, is used for exporting the tach signal of fan 18.If detecting the temperature of this system, Temperature Detector 12 rises, then microcontroller 14 can require drive circuit 16 to accelerate the running speed of fan 18, this moment, drive circuit 16 risings exported the voltage of fan 18 to, after the rotating speed of fan 18 increases, pass tach signal back drive circuit 16 by this signaling line.If detecting the temperature of this system, Temperature Detector 12 descends, expression fan 18 can reduce rotating speed to save the energy, this moment, microcontroller 14 can require drive circuit 16 to reduce the voltage that exports fan 18 to, and drive circuit 16 can be learnt the rotating speed of fan 18 by signaling line.
From the above, can control the sink 10 of fan 18 rotating speeds at present, be to use Temperature Detector 12 to come the testing environment temperature mostly, by microcontroller 14 temperature and the temperature of presetting that Temperature Detector 12 records compared, and the rotating speed requirement of drive circuit 16 being sent fan 18, drive circuit 16 is the feedback signal and the microcontroller 14 desired tach signals of fan 18 rotating speeds relatively, the voltage that control exports fan 18 to changes the rotating speed that comes fan 18, so just can adjust the optimum speed of fan 18 according to the difference of ambient temperature.Yet, this sink 10 needs devices such as Temperature Detector 12, microcontroller 14 and drive circuit 16, improved the cost of sink 10, and sink 10 needs through microcontroller 14 C.Ts, and drive circuit 16 comparison rotating speeds, also reduced the sensitivity of sink 10 with temperature change fan 18 rotating speeds.
Summary of the invention
Therefore main purpose of the present invention be to provide a kind of can be with the sink of temperature change rotation speed of the fan, to address the above problem.
A kind of sink is provided in the preferred embodiment of the present invention, and it comprises a voltage adjuster, is used to provide a reference voltage; One fan, it has a power end, is connected to this reference voltage via one first resistance, and a feedback end, is used for exporting the pulse signal of this rotation speed of the fan; One integration circuit, it has an input end and an output terminal, and this input end is connected to the feedback end of this fan, and the pulse signal that this integration circuit is used for that this feedback end is transmitted converts voltage signal to; One second resistance, first end of this second resistance is connected to this reference voltage, the second end ground connection of this second resistance; And a thermistor, be connected between the output terminal and this reference voltage of this integration circuit, be used for changing and then adjusting the rotating speed of this fan in detected temperatures.
Description of drawings
Fig. 1 is the schematic representation of known sink.
Fig. 2 is the circuit diagram of sink of the present invention.
Fig. 3 is the schematic representation that concerns of Vo and Vx.
Fig. 4 is the schematic representation that concerns of Vo and Rt.
The schematic symbol explanation
10 sinks, 12 Temperature Detectors
14 microcontrollers, 16 drive circuits
18 fans, 20 sinks
22 voltage adjusters, 24 fans
26 first resistance, 28 second resistance
30 the 3rd resistance, 32 electric capacity
34 thermistors, 36 integration circuit
Embodiment
Please refer to Fig. 2, Fig. 2 is the circuit diagram of sink 20 of the present invention.Sink 20 comprises a voltage adjuster 22, a fan 24, one first resistance 26, one second resistance 28, one the 3rd resistance 30, an electric capacity 32 and a thermistor 34, and the annexation between each element of sink as shown in Figure 2.The output terminal of voltage adjuster 22 provides a stable reference voltage, and first end of first resistance 26, second resistance 28 and thermistor 34 all is connected to the output terminal of voltage adjuster 22, and the second end ground connection of second resistance 28 is used to provide a stable electric current.Fan 24 has a power end, a grounding end and a feedback end, and second end of first resistance 26 is connected to the power end of fan 24, is used to provide the operating voltage of fan 24.First end of the 3rd resistance 30 is connected to first end of electric capacity 32, the second end ground connection of electric capacity 32, form an integration circuit 36, the output terminal of integration circuit 36 is first end of the 3rd resistance 30, be connected to second end of thermistor 34, the input end of integration circuit 36 is second end of the 3rd resistance 30, is connected to the feedback end of fan 24, and the rotational speed pulse signal of fan 24 is output as a direct current voltage via integration circuit 36.In Fig. 2 node r, (KCL) writes next equation according to current law:
(Vo-Vr)/R1+ (Vx-Vr)/Rt-Vr/R2=0 formula (1)
Wherein Vo, Vr, Vx are respectively the magnitude of voltage of node o, r, x, Vo is the input voltage of fan 24, Vr is the output voltage of voltage adjuster 22, and Vx is the feedback voltage of integration circuit 36 outputs, and R1, Rt, R2 are respectively the resistance value of first resistance 26, thermistor 34 and second resistance 28.Suppose that under the situation of constant temperature then Rt is a definite value, formula (1) but abbreviation be:
Vo=(1+R1/Rt+R1/R2) Vr-(R1/Rt) Vx formula (2)
Suppose to decide under the situation of rotating speed at fan 24, then Vx is a definite value, formula (1) but abbreviation be:
Vo=(1+R1/R2) Vr-(R1/Rt) is formula (3) (Vx-Vr)
Please refer to Fig. 3 and Fig. 4, Fig. 3 is the schematic representation that concerns of Vo and Vx, Fig. 4 is the schematic representation that concerns of Vo and Rt.Suppose that under the situation of constant temperature then Rt is a definite value, have only two parameters of Vo and Vx in the formula (2), and other parameter can be considered constant, definition a=(1+R1/Rt+R1/R2) Vr, b=(R1/Rt), so formula (2) but abbreviation is Vo=a-bVx, Vo and Vx concern that schematic representation is as shown in Figure 3.When Vo increases, Vx reduces, expression is healed when fast when fan 24 rotating speeds, the feedback end of fan 24 can be exported bigger pulse signal of cycle, export a less magnitude of voltage via integration circuit 36, and when fan 24 rotating speeds diminished, the feedback end of fan 24 can be exported less pulse signal of cycle, export a bigger magnitude of voltage, hence one can see that the rotating speed of fan 24 and the relation between its feedback end output signal via integration circuit 36.Suppose to decide under the situation of rotating speed at fan 24, then Vx is a definite value, have only two parameters of Vo and Rt in the formula (3), and other parameter can be considered constant, definition c=(1+R1/R2) Vr, d=R1 (Vx-Vr), thus formula (3) but abbreviation is Vo=c-d/Rt, Vo and Rt concern that schematic representation is as shown in Figure 4.When Rt increased, Vo also increased, and the resistance value of expression thermistor 34 should rise with temperature and increase, because the increase of Vo can make the faster rotational speed of fan 24, and the relation that hence one can see that between thermistor 34 and the temperature.Fig. 3 and Fig. 4 illustrate the characteristic of sink 20 employed fans 24 and thermistor 34, first, the pulse signal cycle that the feedback end of fan 24 is exported reduces with the rising of rotating speed, and the second, the resistance value of thermistor 34 increases with the rising of temperature.
Below illustrate the working procedure of sink 20, sink 20 is installed in the system to avoid system temperature T too high, when sink starts, provide a reference voltage Vr by voltage adjusting device 22, produce the input voltage Vo1 of fan 24, can get the tach signal Vx1 of fan 24 by formula (2), the initial temperature T0 of system has determined the resistance value Rt0 of thermistor 34, can get the input voltage Vo2 of fan 24 by formula (3), under initial temperature T0, can get the tach signal Vx2 of fan 24 by formula (2), this moment, the input voltage Vo2 of fan 24 made fan 24 keep certain rotating speed.Work along with system, the temperature of system rises to T1 by T0, make the resistance value of thermistor 34 increase to Rt1 by Rt0, can get the input voltage Vo2＞Vo1 of fan 24 by formula (3), the input voltage of fan 24 rises to Vo2 by Vo1, expression fan 24 will rev up, and can be got the tach signal Vx2＜Vx1 of fan 24 by formula (2).Fan 24 revved up after a period of time, and system temperature rolls back T0 by T1, and then the resistance value of thermistor 34 also reduces to get back to Rt1 by Rt2, and the input voltage of fan 24 drops to Vo1, and the tach signal of fan 24 is also got back to Vx1.After the rotating speed of fan 24 reduced, because system's continuous firing, through after a while, the temperature of system just may rise once again, and so repetitive cycling work can avoid system temperature T too high, can make the utilization efficiency that increases fan 24 again.Comprehensive above explanation, the working procedure of entire heat dissipation device 20 is as follows:
T increases Rt and increases Vo and increase Vx and subtract T and subtract Rt and subtract Vo and subtract Vx and increase T and increase
Thermistor 34 rises with temperature, and what increase resistance value is the process of an analog variation, when resistance value increases or reduce, can react to the input voltage of fan 24 via circuit immediately, so the rotating speed of fan 24 can be very sensitive with temperature change, if yet when 34 pairs of bigger temperature variation of thermistor just can respond, the input voltage and the tach signal of fan 24 can reach balance as can be known by formula (2).
From the above, sink 20 uses thermistor 34 to come detected temperatures, because thermistor 34 can change its resistance value with variation of temperature, so can change the input voltage of fan 24 according to variation of temperature, make fan 24 different rotating speeds be arranged in different temperature.In an embodiment of the present invention, the thermistor 34 that sink 20 selects for use a resistance value to rise and increase with temperature, and fan 24 with feedback end, the pulse signal that the feedback end of fan 24 can rise and to reduce with rotating speed, utilize integration circuit 36 that pulse signal is output as a feedback voltage, cooperate first resistance 26 and second resistance 28, make the input voltage of fan 24 can be subjected to thermistor 34 and this time and be subjected to the influence of voltage and change.When temperature rose, sink 20 can produce the input voltage of bigger fan 24, made the faster rotational speed of fan 24, strengthened radiating effect.And when temperature descended, sink 20 can produce the input voltage of less fan 24, and the rotating speed of fan 24 is eased up, and saved the energy.
Compare with known technology, the characteristic that the resistance value of the sharp thermistor of sink of the present invention can change with temperature also can change the input voltage of fan with the difference of temperature via the combination of circuit, and the rotating speed that makes fan increases with the rising of temperature.Known sink needs devices such as Temperature Detector, microcontroller and drive circuit, the rotating speed that relatively changes fan via temperature and rotating speed, yet these have not only improved the cost of sink by the made device of active member, also may produce the situation of erroneous judgement.Sink of the present invention adopts passive devices such as resistance, electric capacity to form, and cost is lower, and thermistor is due to the properties of materials with the temperature change resistance value, and the situation that does not have erroneous judgement takes place.
The above only is preferred embodiment of the present invention, and all equivalences of making according to claim of the present invention change and revise, and all should belong to covering scope of the present invention.
Claims (5)
1. sink, it comprises a fan and a thermistor, it is characterized in that, also comprises:
One voltage adjuster is used to provide a reference voltage;
One integration circuit, it has an input end and an output terminal, and this input end is connected to the feedback end of this fan, and the pulse signal that this integration circuit is used for that this feedback end is transmitted converts voltage signal to;
Wherein, it has a power end this fan, is connected to this reference voltage via one first resistance, and a feedback end, is used for exporting the pulse signal of this rotation speed of the fan; And
This thermistor is connected between the output terminal and this reference voltage of this integration circuit, is used for changing and then adjusting in detected temperatures the rotating speed of this fan.
2. sink as claimed in claim 1, it comprises one second resistance in addition, and first end of this second resistance is connected to this reference voltage, the second end ground connection of this second resistance.
3. sink as claimed in claim 1, wherein this integration circuit is made up of one the 3rd resistance and an electric capacity, first end of this electric capacity is connected to first end of the 3rd resistance, the second end ground connection of this electric capacity, first end of the 3rd resistance is the output terminal of this integration circuit, and second end of the 3rd resistance is the input end of this integration circuit.
4. sink as claimed in claim 1, wherein the resistance value of this thermistor increases with the rising of temperature.
5. sink as claimed in claim 4, wherein the pulse signal exported of this feedback line can reduce with the increase of fan rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03205364 CN2672330Y (en) | 2003-08-19 | 2003-08-19 | Radiator capable of changing fan speed according to temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03205364 CN2672330Y (en) | 2003-08-19 | 2003-08-19 | Radiator capable of changing fan speed according to temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2672330Y true CN2672330Y (en) | 2005-01-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03205364 Expired - Lifetime CN2672330Y (en) | 2003-08-19 | 2003-08-19 | Radiator capable of changing fan speed according to temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2672330Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103671182A (en) * | 2012-09-11 | 2014-03-26 | 鸿富锦精密工业（深圳）有限公司 | Fan rotation speed control device |
| CN109917882A (en) * | 2019-03-07 | 2019-06-21 | 努比亚技术有限公司 | Heat dissipation device and terminal |
-
2003
- 2003-08-19 CN CN 03205364 patent/CN2672330Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103671182A (en) * | 2012-09-11 | 2014-03-26 | 鸿富锦精密工业（深圳）有限公司 | Fan rotation speed control device |
| CN103671182B (en) * | 2012-09-11 | 2016-06-29 | 鸿富锦精密工业（深圳）有限公司 | Fan rotation speed control apparatus |
| CN109917882A (en) * | 2019-03-07 | 2019-06-21 | 努比亚技术有限公司 | Heat dissipation device and terminal |
| CN109917882B (en) * | 2019-03-07 | 2022-05-13 | 努比亚技术有限公司 | Heat dissipation device and terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Suzhou BenQ Photoelectric Technology Co., Ltd. Assignor: Benq Corp. Contract fulfillment period: 2005.2.1 to 2012.1.31 Contract record no.: 2009990000248 Denomination of utility model: Radiator capable of changing fan speed according to temperature Granted publication date: 20050119 License type: Exclusive license Record date: 20090401 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2005.2.1 TO 2012.1.31; CHANGE OF CONTRACT Name of requester: SUZHOU BENQ PHOTOELECTRIC TECHNOLOGY CO., LTD. Effective date: 20090401 |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130819 Granted publication date: 20050119 |