CN105370607A - Fan control circuit - Google Patents
Fan control circuit Download PDFInfo
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- CN105370607A CN105370607A CN201410440267.2A CN201410440267A CN105370607A CN 105370607 A CN105370607 A CN 105370607A CN 201410440267 A CN201410440267 A CN 201410440267A CN 105370607 A CN105370607 A CN 105370607A
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- electrically connected
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- comparator
- temperature
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- Control Of Electric Motors In General (AREA)
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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
A fan control circuit comprises a plurality of temperature detection units, a temperature comprehensive unit and a drive signal generation unit. The temperature detection units are used for detecting running temperatures of multiple heating elements in an electronic device respectively so as to correspondingly output multiple temperature detection signals. The temperature comprehensive unit is electrically connected to the multiple temperature detection units and used for working out an average-value temperature signal according to the temperature detection signals and multiple corresponding preset weighted values. The drive signal generation unit is electrically connected to the temperature comprehensive unit and used for generating a drive signal according to the average-value temperature signal output by the temperature comprehensive unit so as to drive a fan. According to the fan control circuit, the detected temperatures are worked out through the multiple temperature detection units and the corresponding weighted values, the duty ratio of the drive signal of the fan is regulated according to the detected temperatures, and therefore the rotating speed of the fan is regulated in real time, and electric power is saved.
Description
Technical field
The present invention relates to the fan art in electronic equipment, particularly relate to the fan control circuitry in a kind of electronic equipment.
Background technique
In the electronic equipment that some heatings are larger, be usually all designed with fan to carry out active heat removal, fan needs fan control circuitry to adjust rotation speed of the fan according to the change of temperature in electronic equipment simultaneously.Existing design fan control circuitry normally processor receives the single temperature detecting signal software algorithm that also foundation is default to adjust rotation speed of the fan, and each chip is not identical to the susceptibility of temperature, resistance to temperature value in electronic equipment, single temperature detecting can not meet the cooling requirements of each chip.Therefore, design a kind of fan control circuitry that can be weighted the computing of formula temperature detecting according to the significance of each chip in electronic equipment and become a large research topic.
Summary of the invention
In view of this, need provide a kind of fan control circuitry, it adjusts the rotation of fan by Weighting type temperature detecting.
Embodiment of the present invention provides a kind of fan control circuitry, for controlling the fan turns in electronic equipment, described electronic equipment comprises multiple heater element, and described fan control circuitry comprises multiple temperature detecting unit, temperature integrated unit and drive signal generation unit.Described multiple temperature detecting unit is used for the running temperature of the multiple heater elements detecting described electronic equipment respectively, exports multiple temperature detecting signal with correspondence.Described temperature integrated unit is electrically connected on described multiple temperature detecting unit, for calculating average temperature signal according to described multiple temperature detecting signal and corresponding multiple default weighted value.Described drive signal generation unit is electrically connected on described temperature integrated unit, and the average temperature signal for exporting according to described temperature integrated unit produces drive singal to drive described fan.
Preferably, described temperature integrated unit comprises comparator and multiple resistance.Described comparator comprises positive input, reverse input end and output terminal, and described reverse input end is electrically connected on described output terminal.Described multiple resistance, one end one_to_one corresponding of each resistance is electrically connected on each temperature detecting unit, the other end ground connection of each resistance.
Preferably, described drive signal generation unit comprises pyramidal wave generation unit and comparing unit.Described pyramidal wave generation unit is for exporting triangular signal.The average temperature signal that described comparing unit is used for triangular signal and the described temperature integrated unit output exported according to described pyramidal wave generation unit produces described drive singal to adjust the rotating speed of described fan.
Preferably, the frequency of the triangular signal of described pyramidal wave generation unit output equals the frequency of okperation of described fan.
Preferably, the first comparator, the first resistance, the second resistance, the 3rd resistance, the second comparator and electric capacity is comprised described in.Described first comparator comprises positive input, reverse input end and output terminal, described reverse input end ground connection.Described first resistance one end is electrically connected on the positive input of described first comparator.Described second resistance one end is electrically connected on the output terminal of described first comparator, and the other end is electrically connected on the common port of described first resistance and described first comparator.Described 3rd resistance one end is electrically connected on the output terminal of described first comparator.Described second comparator comprises positive input, reverse input end and output terminal, described positive input ground connection, and described reverse input end is electrically connected on the other end of described 3rd resistance, and described output terminal is electrically connected on the other end of described first resistance.Between the reverse input end that described electric capacity is electrically connected on described second comparator and output terminal.
Preferably, described comparing unit comprises comparator, the first resistance and the second resistance.Described comparator comprises positive input, reverse input end and output terminal, and described reverse input end is electrically connected on described temperature integrated unit, and described output terminal is electrically connected on described fan.Described first resistance one end is electrically connected on described pyramidal wave generation unit, and the other end is electrically connected on the positive input of described comparator.Described second resistance one end is electrically connected on the common port of described comparator and described first resistance, the other end ground connection.
Preferably, described drive singal is pulse width modulating signal, and described drive signal generation unit adjusts the dutycycle of described drive singal, to adjust the rotating speed of described fan according to the average temperature signal that described temperature integrated unit exports.
Preferably, each temperature detecting unit includes and is connected in series in thermistor between VDD-to-VSS and current-limiting resistance.
Preferably, described heater element significance in described electronic equipment is higher, and corresponding default weighted value is larger.
Said fans control circuit calculates detected temperature by multiple temperature detecting point and corresponding weighted value, and then according to the temperature detected to adjust the dutycycle of fan driving signal, thus realize the rotating speed adjusting fan in real time, to save electric power, fan control circuitry is pure hardware circuit simultaneously, saves development cost.
Accompanying drawing explanation
Fig. 1 is the module map in fan control circuitry one mode of execution of the present invention.
Fig. 2 is the circuit diagram in fan control circuitry one mode of execution of the present invention.
Primary component symbol description
Electronic equipment 1
Fan control circuitry 100,100a
Fan 200
Temperature detecting unit 10a, 10b, 10c
Temperature integrated unit 20
Drive signal generation unit 30
Pyramidal wave generation unit 302
Comparing unit 304
Power supply VCC
Thermistor RT
Current-limiting resistance Rr
First to the 8th resistance R1, R2, R3, R4, R5, R6, R7, R8
First to fourth comparator OP1, OP2, OP3, OP4
Electric capacity C1
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Fig. 1 is the module map of an embodiment of the present invention fan control circuit 100.In the present embodiment, electronic equipment 1 comprises multiple heater element (not shown), fan control circuitry 100 and fan 200, wherein fan control circuitry 100 is for controlling the rotation of fan 200, to realize active heat removal, thus ensure that electronic equipment 1 operationally there will not be superheating phenomenon.Fan control circuitry 100 comprises multiple temperature detecting unit 10a, 10b, 10c (in present embodiment, only for three, but be not limited with three, can comprise be less than or more than three temperature detecting units), temperature integrated unit 20 and drive signal generation unit 30.Each temperature detecting unit 10a, 10b, 10c detect the temperature of a heater element and export corresponding temperature detecting signal.In the present embodiment, multiple heater element can be the components and parts such as important chip, field effect transistor in electronic equipment 1.Temperature detecting signal is voltage signal, and the quantity of the heater element that the quantity of temperature detecting unit 10a, 10b, 10c can be detected as required is determined.
Temperature integrated unit 20 is electrically connected on multiple temperature detecting unit 10a, 10b, 10c, and multiple temperature detecting signal that temperature integrated unit 20 exports according to multiple temperature detecting unit 10a, 10b, 10c and corresponding multiple default weighted value calculate average temperature signal.Drive signal generation unit 30 is electrically connected on temperature integrated unit 20, and drive signal generation unit 30 produces drive singal to drive and to adjust the rotating speed fan 200 of fan according to the average temperature signal that temperature integrated unit 20 exports.In the present embodiment, drive singal is pulse duration modulation (PWM) signal, the average temperature signal that drive signal generation unit 30 can export according to temperature integrated unit 20 adjusts the dutycycle of pwm signal, to adjust the rotating speed of described fan, thus realize, in real time according to the rotating speed of the temperature adjustment fan in electronic equipment 1, realizing energy saving and reducing fan 200 rotational noise.
It should be noted that each heater element is correspondingly provided with one and presets weighted value, heater element significance in electronic equipment 1 is higher, and corresponding default weighted value is larger.For example, three temperature detecting units 10a, 10b, 10c detect the temperature of three heater elements, and corresponding output three temperature detecting signals V1, V2, V3, the default weighted value corresponding to three heater elements is respectively a, b, c.The average temperature signal that temperature integrated unit 20 calculates can be drawn by following formulae discovery: (a*V1+b*V2+c*V3)/(a+b+c).
In an embodiment of the present invention, drive signal generation unit 30 comprises pyramidal wave generation unit 302 and comparing unit 304.Pyramidal wave generation unit 302 is for exporting triangular signal, and its frequency determines according to the frequency of okperation of fan 200.The triangular signal that comparing unit 304 exports according to pyramidal wave generation unit 302 and the average temperature signal that temperature integrated unit 20 exports produce drive singal to drive and to adjust the rotating speed of fan 200.In the present embodiment, the frequency of the triangular signal of pyramidal wave generation unit 302 output equals the frequency of okperation of fan 200.
Fig. 2 is the circuit diagram of an embodiment of the present invention fan control circuit 100a.In the present embodiment, each temperature detecting unit 10a, 10b, 10c includes and is connected in series in thermistor RT between power supply VCC and ground and current-limiting resistance Rr.Temperature detecting unit 10a, 10b, 10c realize temperature detecting by thermistor RT.In the present embodiment, thermistor RT is the thermistor of negative temperature coefficient.Temperature integrated unit 20 comprises the first comparator OP1, the first resistance R1, the second resistance R2 and the 3rd resistance R3.First comparator OP1 comprises positive input, reverse input end and output terminal, and the reverse input end of the first comparator OP1 is connected with its output terminal.One end of first resistance R1 is electrically connected on the common port of thermistor RT in temperature detecting unit 10a and current-limiting resistance Rr, and the other end of the first resistance R1 is electrically connected on the positive input of the first comparator OP1.One end of second resistance R2 is electrically connected on the common port of thermistor RT in temperature detecting unit 10b and current-limiting resistance Rr, and the other end of the second resistance R2 is electrically connected on the positive input of the first comparator OP1.One end of 3rd resistance R3 is electrically connected on the common port of thermistor RT in temperature detecting unit 10c and current-limiting resistance Rr, and the other end of the 3rd resistance R3 is electrically connected on the positive input of the first comparator OP1.In the present embodiment, the resistance of current-limiting resistance Rr equals the resistance of thermistor RT under normal temperature.Simultaneously in order to ensure the accuracy of temperature detecting, the resistance of the first resistance R1, the second resistance R2 and the 3rd resistance R3 is preferably all greater than the resistance of the current-limiting resistance Rr of 10 times.In other mode of executions of the present invention, thermistor RT also can replace with the temperature transducer of other kinds.Temperature integrated unit 20 also can calculate average temperature signal by other average modular converter.
Pyramidal wave generation unit 302 comprises the second comparator OP2, the 3rd comparator OP3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and electric capacity C1.Second comparator OP2 comprises positive input, reverse input end and output terminal.The positive input of the second comparator OP2 is electrically connected on one end of the 4th resistance R4, the reverse input end ground connection of the second comparator OP2.One end of 5th resistance R5 is electrically connected on the output terminal of the second comparator OP2, and the other end of the 5th resistance R5 is electrically connected on the common port of the second comparator OP2 and the 4th resistance R4.One end of 6th resistance R6 is electrically connected on the output terminal of the second comparator OP2 and the common port of the 5th resistance R5.3rd comparator OP3 comprises positive input, reverse input end and output terminal.The positive input ground connection of the 3rd comparator OP3, the reverse input end of the 3rd comparator OP3 is electrically connected on the other end of the 6th resistance R6, and the output terminal of the 3rd comparator OP3 is electrically connected on the other end and the comparing unit 304 of the 4th resistance R4.Between the reverse input end that electric capacity C1 is electrically connected on the 3rd comparator OP3 and output terminal.The frequency of the triangular signal that pyramidal wave generation unit 302 exports can be drawn by following formulae discovery: R5/ (4*R4*R6*C1).Pyramidal wave generation unit 302 can adjust the frequency of the triangular signal of output by adjusting the 4th resistance R4, the 5th resistance R5, the resistance of the 6th resistance R6 and the capacitance of electric capacity C1.In other mode of executions of the present invention, pyramidal wave generation unit 302 also can utilize the triangular signal generator based triangular signal exporting required frequency.
Comparing unit 304 comprises the 4th comparator OP4, the 7th resistance R7 and the 8th resistance R8.4th comparator OP4 comprises positive input, reverse input end and output terminal.The reverse input end of the 4th comparator OP4 is electrically connected on the output terminal of the first comparator OP1, and the output terminal of the 4th comparator OP4 is electrically connected on fan 200.One end of 7th resistance R7 is electrically connected on the output terminal of the 3rd comparator OP3, and the other end of the 7th resistance R7 is electrically connected on the positive input of the 4th comparator OP4.One end of 8th resistance R8 is electrically connected on the common port of the 4th comparator OP4 and the 7th resistance R7, the other end ground connection of the 8th resistance R8.The triangular signal that 4th comparator OP4 is exported by the average temperature signal and pyramidal wave generation unit 302 receiving also C.T comprehensive unit 20 output carrys out output pulse width modulation signal, with drive fan 200.Comparing unit 304 can adjust the output voltage values of the 4th comparator OP4 by the resistance adjusting the 7th resistance R7 and the 8th resistance R8, carry out drive fan 200 with the voltage exporting suitable size.
Said fans control circuit calculates detected temperature by multiple temperature detecting point and corresponding weighted value, and then according to the temperature detected to adjust the dutycycle of fan driving signal, thus realize the rotating speed adjusting fan in real time, to save electric power, fan control circuitry is pure hardware circuit simultaneously, saves development cost.
Claims (9)
1. a fan control circuitry, for controlling the fan turns in electronic equipment, described electronic equipment comprises multiple heater element, it is characterized in that, described fan control circuitry comprises:
Multiple temperature detecting unit, for detecting the running temperature of multiple heater elements of described electronic equipment respectively, exports multiple temperature detecting signal with correspondence;
Temperature integrated unit, is electrically connected on described multiple temperature detecting unit, for calculating average temperature signal according to described multiple temperature detecting signal and corresponding multiple default weighted value; And
Drive signal generation unit, is electrically connected on described temperature integrated unit, and the average temperature signal for exporting according to described temperature integrated unit produces drive singal to drive described fan.
2. fan control circuitry as claimed in claim 1, it is characterized in that, described temperature integrated unit comprises:
Comparator, comprises positive input, reverse input end and output terminal, and described reverse input end is electrically connected on described output terminal; And
Multiple resistance, one end one_to_one corresponding of each resistance is electrically connected on temperature detecting unit described in each, and the other end of each resistance is all electrically connected on the positive input of described comparator.
3. fan control circuitry as claimed in claim 1, it is characterized in that, described drive signal generation unit comprises:
Pyramidal wave generation unit, for exporting triangular signal; And
Comparing unit, produces described drive singal to drive described fan for the average temperature signal exported according to triangular signal and the described temperature integrated unit of described pyramidal wave generation unit output.
4. fan control circuitry as claimed in claim 3, is characterized in that, the frequency of the triangular signal that described pyramidal wave generation unit exports equals the frequency of okperation of described fan.
5. fan control circuitry as claimed in claim 3, it is characterized in that, described pyramidal wave generation unit comprises:
First comparator, comprises positive input, reverse input end and output terminal, described reverse input end ground connection;
First resistance, one end is electrically connected on the positive input of described first comparator;
Second resistance, one end is electrically connected on the output terminal of described first comparator, and the other end is electrically connected on the common port of described first resistance and described first comparator;
3rd resistance, one end is electrically connected on the output terminal of described first comparator;
Second comparator, comprises positive input, reverse input end and output terminal, described positive input ground connection, and described reverse input end is electrically connected on the other end of described 3rd resistance, and described output terminal is electrically connected on the other end of described first resistance; And
Electric capacity, between the reverse input end being electrically connected on described second comparator and output terminal.
6. fan control circuitry as claimed in claim 3, it is characterized in that, described comparing unit comprises:
Comparator, comprises positive input, reverse input end and output terminal, and described reverse input end is electrically connected on described temperature integrated unit, and described output terminal is electrically connected on described fan;
First resistance, one end is electrically connected on described pyramidal wave generation unit, and the other end is electrically connected on the positive input of described comparator; And
Second resistance, one end is electrically connected on the common port of described comparator and described first resistance, the other end ground connection.
7. fan control circuitry as claimed in claim 1, it is characterized in that, described drive singal is pulse width modulating signal, and described drive signal generation unit adjusts the dutycycle of described drive singal, to adjust the rotating speed of described fan according to the average temperature signal that described temperature integrated unit exports.
8. fan control circuitry as claimed in claim 1, is characterized in that, each temperature detecting unit includes and is connected in series in thermistor between VDD-to-VSS and current-limiting resistance.
9. fan control circuitry as claimed in claim 1, it is characterized in that, described heater element significance in described electronic equipment is higher, and corresponding default weighted value is larger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410440267.2A CN105370607A (en) | 2014-09-01 | 2014-09-01 | Fan control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410440267.2A CN105370607A (en) | 2014-09-01 | 2014-09-01 | Fan control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105370607A true CN105370607A (en) | 2016-03-02 |
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ID=55373116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410440267.2A Pending CN105370607A (en) | 2014-09-01 | 2014-09-01 | Fan control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111465265A (en) * | 2020-04-03 | 2020-07-28 | 中国工商银行股份有限公司 | Temperature adjusting method and device, electronic equipment and storage medium |
| CN111526696A (en) * | 2020-04-17 | 2020-08-11 | 中国工商银行股份有限公司 | Temperature adjusting method and device, electronic equipment and storage medium |
| CN112038915A (en) * | 2020-09-03 | 2020-12-04 | 中国人民解放军海军工程大学 | Opposite-mounted vertical air-cooling heat dissipation system and control method |
| CN115585155A (en) * | 2022-11-07 | 2023-01-10 | 东方博沃（北京）科技有限公司 | Fan rotating speed control device |
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| CN102444603A (en) * | 2010-10-13 | 2012-05-09 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN103775366A (en) * | 2012-10-23 | 2014-05-07 | 深圳市航嘉驰源电气股份有限公司 | Power supply temperature sampling and fan control circuit and power supply device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111465265A (en) * | 2020-04-03 | 2020-07-28 | 中国工商银行股份有限公司 | Temperature adjusting method and device, electronic equipment and storage medium |
| CN111465265B (en) * | 2020-04-03 | 2022-04-22 | 中国工商银行股份有限公司 | Temperature adjusting method and device, electronic equipment and storage medium |
| CN111526696A (en) * | 2020-04-17 | 2020-08-11 | 中国工商银行股份有限公司 | Temperature adjusting method and device, electronic equipment and storage medium |
| CN112038915A (en) * | 2020-09-03 | 2020-12-04 | 中国人民解放军海军工程大学 | Opposite-mounted vertical air-cooling heat dissipation system and control method |
| CN112038915B (en) * | 2020-09-03 | 2022-06-28 | 中国人民解放军海军工程大学 | Opposite-mounted vertical air-cooling heat dissipation system and control method |
| CN115585155A (en) * | 2022-11-07 | 2023-01-10 | 东方博沃（北京）科技有限公司 | Fan rotating speed control device |
| CN115585155B (en) * | 2022-11-07 | 2023-08-29 | 东方博沃（北京）科技有限公司 | Fan rotating speed control device |
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Application publication date: 20160302 |