CN105822578A - Multi-mode fan control circuit, cooling device and electronic equipment - Google Patents
Multi-mode fan control circuit, cooling device and electronic equipment Download PDFInfo
- Publication number
- CN105822578A CN105822578A CN201510013209.6A CN201510013209A CN105822578A CN 105822578 A CN105822578 A CN 105822578A CN 201510013209 A CN201510013209 A CN 201510013209A CN 105822578 A CN105822578 A CN 105822578A
- Authority
- CN
- China
- Prior art keywords
- resistance
- fan
- switch element
- electric capacity
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Control Of Temperature (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention belongs to the electronic field and provides a multi-mode fan control circuit, a cooling device and electronic equipment. The multi-mode fan control circuit comprises a power detection unit, a switch unit, a current limiting unit and a linear driving unit, wherein the power detection unit is used for detecting the system power and generating a driving signal when the system power reaches a preset value; the switch unit does not start a fan to work when not receiving the driving signal and controls the fan to rotate at a low speed when receiving the driving signal; the current limiting unit is used for achieving current limiting protection of the switch unit; and the linear driving unit is used for detecting the environment temperature and linearly controlling the rotating speed of the fan according to the environment temperature, so that the rotating speed of the fan is made to be within in a linear range. According to the multi-mode fan control circuit, the cooling device and the electronic equipment, the rotating speed of the fan is controlled to be within three rotating speed ranges when a system is in a no-load state, a light-load state and a heavy-load state correspondingly; and the effects that when the system is in a low-power stage, the fan does not work, and the linear driving unit is stopped for reducing the driving loss; when the system is in a medium-power stage, the rotating speed is low, the system noise is lowered, and the service life is prolonged; and when the system is in a high-power stage, linear driving is conducted, and effective cooling is achieved are realized.
Description
Technical field
The invention belongs to electronic applications, particularly relate to a kind of multi-mode fan control circuitry, heat abstractor and electronic equipment.
Background technology
The power that generally system host of electronic product operationally consumes has a big chunk to come out in the way of heat, cause the rising of cabinet inside temperature, and most of electronic device can affect electrical quality even reduce service life because of the rising of temperature, it is thus desirable to fill fan in internal system, come to system radiating by the way of air blast cooling.
Existing fan drive control circuit sees Fig. 1, wherein mainly detects temperature variations by a negative tempperature coefficient thermistor THR1, and is controlled the rotating speed of fan by an audion Q2 as signal amplification circuit.
But, this circuit is the narrowest to the control interval of rotation speed of the fan, general range is only 800～about 1000RPM, and system temperature rise is the highest when system zero load or underloading, though fan energy reduction of speed, the noise of fan work is the biggest, life, work to user all bring the biggest puzzlement, also affecting the service life of fan, the energy loss simultaneously driving circuit is the biggest, is unfavorable for energy-conserving and environment-protective.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of multi-mode fan control circuitry, it is intended to solve existing fan when unloaded or underloading noise greatly, the most energy-conservation problem.
The embodiment of the present invention is achieved in that a kind of multi-mode fan control circuitry, and described circuit includes:
Power detecting unit, for detecting system power, and generates driving signal when described system power reaches preset value；
Switch element, for not starting fan work when being not received by described driving signal, control fan to slowly run when receiving described driving signal, the end that controls of described switch element is connected with the outfan of described power detecting unit, the input of described switch element is connected with supply voltage, and the outfan of described switch element is connected with described fan；
Flow-restriction, for described switch element is realized current-limiting protection, the input of described flow-restriction is connected with supply voltage, and the outfan of described flow-restriction is connected with the control end of described switch element；
Linear drive unit, is used for detecting ambient temperature, according to ambient temperature Linear Control rotation speed of the fan, makes described rotation speed of the fan be in linear zone, and the drive end of described linear drive unit is connected with the control end of described switch element.
The another object of the embodiment of the present invention is, it is provided that a kind of heat abstractor using above-mentioned multi-mode fan control circuitry.
The another object of the embodiment of the present invention is, it is provided that a kind of electronic equipment using above-mentioned heat abstractor.
The embodiment of the present invention controls rotation speed of the fan when system zero load, underloading and heavy duty and is respectively at three kinds of rotating speed intervals, it is separately implemented at system lower power stage fan not work, provide the user with a kind of silent mode, simultaneously turn off linear drive unit and drive loss to reduce, it is achieved energy-conserving and environment-protective；Power phase provides one to stablize low-work voltage to fan and makes the steady slow-speed of revolution of rotation speed of the fan in systems, thus reduces system noise, also extends the service life of fan simultaneously；There is provided a Linear Driving in the system high-power stage to fan, be preferably system radiating.
Accompanying drawing explanation
Fig. 1 is existing fan drive control circuit figure；
The structure chart of the multi-mode fan control circuitry that Fig. 2 provides for the embodiment of the present invention；
The exemplary circuit structure chart of the multi-mode fan control circuitry that Fig. 3 provides for the embodiment of the present invention；
The multi-mode fan control circuitry that Fig. 4 provides for using the embodiment of the present invention controls the speed curves figure of lower fan.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of invention described below does not constitutes conflict each other.
The embodiment of the present invention controls rotation speed of the fan when system zero load, underloading and heavy duty and is respectively at three kinds of rotating speed intervals, it is separately implemented at system lower power stage fan not work, simultaneously turn off linear drive unit and drive loss to reduce, the power phase slow-speed of revolution in systems, reduce system noise, increase the service life, in system high-power stage Linear Driving, effectively dispel the heat.
Below in conjunction with specific embodiment, the realization of the present invention is described in detail:
Fig. 2 shows the structure of the multi-mode fan control circuitry that the embodiment of the present invention provides, and for convenience of description, illustrate only part related to the present invention.
As one embodiment of the invention, this multi-mode fan control circuitry can apply in the heat abstractor of any electronic equipment, and this multi-mode fan control circuitry 1 is connected with fan 2, including:
Power detecting unit 11, for detecting system power, and generates driving signal when system power reaches preset value；
Switch element 12, work for not starting fan 2 when being not received by and driving signal, control fan 2 when receiving driving signal to slowly run, the end that controls of this switch element 12 is connected with the outfan of power detecting unit 11, the input of switch element 12 is connected with 12V supply voltage (VCC), the outfan of switch element 12 is connected with the positive pole of fan 2, the minus earth of fan 2；
Flow-restriction 13, for switch element 12 is realized current-limiting protection, the input of this flow-restriction 13 is connected with 12V supply voltage (VCC), and the outfan of flow-restriction 13 is connected with the control end of switch element 12；
Linear drive unit 14, is used for detecting ambient temperature, according to system temperature Linear Control rotation speed of the fan, makes rotation speed of the fan be in linear zone, and the drive end of this linear drive unit 14 is connected with the control end of switch element 12.
In embodiments of the present invention, whether the fan under power detecting unit 11 detecting system power controls reaches predetermined power value, when being not reaching to fan and playing turning point (a corresponding preset value), fan does not works, now fan is in silent mode, simultaneously turns off linear drive unit 14 and drives loss to reduce；
When reaching fan and playing turning point (a corresponding preset value), providing a stable low-work voltage to make fan be in the steady slow-speed of revolution to fan, fan enters low-speed mode, thus effectively reduces system noise；
Constantly increase at system power, linear drive unit 14 detects when system temperature raises, control fan by switch element 12 and enter Serial regulation state, rotation speed of the fan is according to system temperature linear change, now fan is in fast mode, with reference to Fig. 4, the control interval of fan can be expanded between 500～1800RPM, thus ensure that system is effectively dispelled the heat by the embodiment of the present invention.
The embodiment of the present invention controls rotation speed of the fan when system zero load, underloading and heavy duty and is respectively at three kinds of rotating speed intervals, it is separately implemented at system lower power stage fan not work, provide the user with a kind of silent mode, simultaneously turn off linear drive unit and drive loss to reduce, it is achieved energy-conserving and environment-protective；Power phase provides one to stablize low-work voltage to fan and makes the steady slow-speed of revolution of rotation speed of the fan in systems, thus reduces system noise, also extends the service life of fan simultaneously；There is provided a Linear Driving in the system high-power stage to fan, be preferably system radiating.
Fig. 3 shows the exemplary circuit structure of the multi-mode fan control circuitry that the embodiment of the present invention provides, and for convenience of description, illustrate only part related to the present invention.
As one embodiment of the invention, power detecting unit 11 includes:
Current transformer T1, diode D1, resistance R1, resistance R2, resistance R3, electric capacity C1, electric capacity C2, electric capacity C3 and comparing unit 111；
nullSensing output one end of current transformer T1 is connected with the anode of diode D1，The negative electrode of diode D1 is connected with one end of resistance R1 and one end of electric capacity C1 simultaneously，The sensing output other end ground connection simultaneously of the other end of resistance R1 and the other end of electric capacity C1 and current transformer T1，The negative electrode of diode D1 also one end with resistance R2 is connected，The other end of resistance R2 is connected with one end of resistance R3 and one end of electric capacity C2 simultaneously，The other end of resistance R3 and the other end of electric capacity C2 ground connection simultaneously，The other end of resistance R2 also positive input with comparing unit 111 is connected，The reverse input end of comparing unit 111 passes through electric capacity C3 ground connection，The power end of comparing unit 111 is connected with 12V supply voltage (VCC)，The earth terminal ground connection of comparing unit 111，The outfan of comparing unit 111 is the outfan of power detecting unit 11.
As one embodiment of the present invention, comparing unit 111 preferably employs the comparator IC1A of negative pole reference voltage.
As one embodiment of the invention, switch element 12 can be realized by switching tube or on-off circuit, the current input terminal of this switching tube is switch element 12 input, and the current output terminal of switching tube is the outfan of switch element 12, the control end that control end is switch element 12 of switching tube.
Preferably, switching tube can use NPN type triode Q1, the current input terminal of the current collection of NPN type triode Q1 extremely switching tube, the current output terminal of the transmitting of NPN type triode Q1 extremely switching tube, and the base stage of NPN type triode Q1 is the control end of switching tube.
As one embodiment of the invention, flow-restriction 13 can use resistance R5, the two ends of resistance R5 to be respectively input and the outfan of flow-restriction 13.
Linear drive unit 14 includes:
Resistance R4, resistance R6, resistance R7, electric capacity C4, critesistor RT1 and output adjustable reference power supply IC2；
One end of resistance R4 is connected with supply voltage, the other end of resistance R4 is connected with one end of critesistor RT1 and one end of electric capacity C4 simultaneously, the other end of critesistor RT1 and the other end of electric capacity C4 ground connection simultaneously, the other end of resistance R4 is connected with one end of resistance R7 and the adjustable side (R foot) of output adjustable reference power supply IC2 also simultaneously, the other end of resistance R7 is connected with reference voltage output end (K foot) and one end of resistance R6 of output adjustable reference power supply IC2 simultaneously, cold end (A foot) ground connection of output adjustable reference power supply IC2, the other end of resistance R6 is the drive end of linear drive unit.
When system lower power stage, by current transformer T1 induce current signal the least, by diode D1 rectification, electric capacity C1 filters, the voltage formed on resistance R1 is relatively low, 2 feet of comparator IC1A it are divided to again by resistance R2 and resistance R3, compare with 1 foot of comparator IC1A, now little due to current signal, the 2 foot voltages of comparator IC1A, the 1 foot voltage less than comparator IC1A, comparator IC1A does not works, its 3 foot is in electronegative potential, audion Q1 is not turned on, and now fan does not works, and system is in mute state；
nullThe power used along with system increases，Voltage on resistance R1 rises，It is divided to the 2 foot voltages of comparator IC1A more than 1 foot voltage by resistance R2 and resistance R3，Comparator IC1A works，Its 3 foot is in high potential，Arranged by the parameter of resistance R4 and critesistor RT1，Now the R foot current potential of output adjustable reference power supply IC2 is more than 2.5V，Output adjustable reference power supply IC2 is in off position，K foot pressure reduction over the ground is at about 1.9V，Again by voltage Vka (about 1.9V) dividing potential drop of resistance R5 and resistance R6 with output adjustable reference power supply IC2，The base potential of audion Q1 obtains a stable current potential (being generally located on about 5V)，Now audion Q1 is open-minded，Power supply unit (power supply) provides one by audion Q1 to fan and stablizes low-work voltage，Fan is made to be in the steady slow-speed of revolution,To reduce system noise；
The power used along with system strengthens further, internal system temperature raises, diminished by critesistor RT1 (this critesistor RT1 is a negative tempperature coefficient thermistor) resistance, the R foot current potential of output adjustable reference power supply IC2 declines, when the R foot current potential of output adjustable reference power supply IC2 drops below 2.5V benchmark, output adjustable reference power supply IC2 enters Serial regulation state, the R foot voltage of output adjustable reference power supply IC2 is the lowest, the voltage of K foot is the highest, the base potential of audion Q1 is the highest, audion Q1 conducting is the deepest, voltage on fan is the highest, rotating speed is the fastest, now enter Serial regulation pattern, timely system thermal is discharged；
Power drop with system, system temperature reduces, and the resistance of critesistor RT1 rises, and output adjustable reference power supply IC2 is in off position, fan returns to one and stablizes low-work voltage state, fan is made to be in the steady slow-speed of revolution, to reduce system noise, if system power further reduces, comparator IC1A also stops this action, audion Q1 turns off, and fan quits work, and enters and is in mute state.
The another object of the embodiment of the present invention is, it is provided that a kind of heat abstractor using above-mentioned multi-mode fan control circuitry, and uses the electronic equipment of above-mentioned heat abstractor.
The embodiment of the present invention controls rotation speed of the fan when system zero load, underloading and heavy duty and is respectively at three kinds of rotating speed intervals, it is separately implemented at system lower power stage fan not work, provide the user with a kind of silent mode, simultaneously turn off linear drive unit and drive loss to reduce, it is achieved energy-conserving and environment-protective；Power phase provides one to stablize low-work voltage to fan and makes the steady slow-speed of revolution of rotation speed of the fan in systems, thus reduces system noise, also extends the service life of fan simultaneously；There is provided a Linear Driving in the system high-power stage to fan, be preferably system radiating.
These are only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (9)
1. a multi-mode fan control circuitry, is connected with fan, it is characterised in that described circuit includes:
Power detecting unit, for detecting system power, and generates driving signal when described system power reaches preset value；
Switch element, for not starting fan work when being not received by described driving signal, control fan to slowly run when receiving described driving signal, the end that controls of described switch element is connected with the outfan of described power detecting unit, the input of described switch element is connected with supply voltage, and the outfan of described switch element is connected with described fan；
Flow-restriction, for described switch element is realized current-limiting protection, the input of described flow-restriction is connected with supply voltage, and the outfan of described flow-restriction is connected with the control end of described switch element；
Linear drive unit, is used for detecting ambient temperature, according to ambient temperature Linear Control rotation speed of the fan, makes described rotation speed of the fan be in linear zone, and the drive end of described linear drive unit is connected with the control end of described switch element.
2. circuit as claimed in claim 1, it is characterised in that described power detecting unit includes:
Current transformer, diode D1, resistance R1, resistance R2, resistance R3, electric capacity C1, electric capacity C2, electric capacity C3 and comparing unit；
nullSensing output one end of described current transformer is connected with the anode of described diode D1，The negative electrode of described diode D1 is connected with one end of one end of described resistance R1 and described electric capacity C1 simultaneously，The sensing output other end ground connection simultaneously of the other end of described resistance R1 and the other end of described electric capacity C1 and described current transformer，The negative electrode of described diode D1 also one end with described resistance R2 is connected，The other end of described resistance R2 is connected with one end of one end of described resistance R3 and described electric capacity C2 simultaneously，The other end of described resistance R3 and the other end of described electric capacity C2 ground connection simultaneously，The other end of described resistance R2 also positive input with described comparing unit is connected，The reverse input end of described comparing unit passes through described electric capacity C3 ground connection，The power end of described comparing unit is connected with supply voltage，The earth terminal ground connection of described comparing unit，The outfan of described comparing unit is the outfan of described power detecting unit.
3. circuit as claimed in claim 2, it is characterised in that described comparing unit is the comparator of negative pole reference voltage.
4. circuit as claimed in claim 1, it is characterised in that described linear drive unit includes:
Resistance R4, resistance R6, resistance R7, electric capacity C4, critesistor RT1 and output adjustable reference power supply IC2；
One end of described resistance R4 is connected with supply voltage, the other end of described resistance R4 is connected with one end of one end of described critesistor RT1 and described electric capacity C4 simultaneously, the other end of described critesistor RT1 and the other end of described electric capacity C4 ground connection simultaneously, the other end of described resistance R4 is connected with the adjustable side of one end of described resistance R7 and described output adjustable reference power supply IC2 also simultaneously, the other end of described resistance R7 is connected with the described reference voltage output end of output adjustable reference power supply IC2 and one end of described resistance R6 simultaneously, the cold end ground connection of described output adjustable reference power supply IC2, the drive end that the other end is described linear drive unit of described resistance R6.
5. circuit as claimed in claim 1, it is characterised in that described flow-restriction is resistance R5, and the two ends of described resistance R5 are respectively input and the outfan of described flow-restriction.
6. circuit as claimed in claim 1, it is characterized in that, described switch element is switching tube, the current input terminal of described switching tube is described switch element input, the current output terminal of described switching tube is the outfan of described switch element, the control end that control end is described switch element of described switching tube.
7. circuit as claimed in claim 6, it is characterized in that, described switching tube is NPN type triode, the current input terminal of the most described switching tube of current collection of described NPN type triode, the current output terminal of the most described switching tube of transmitting of described NPN type triode, the base stage of described NPN type triode is the control end of described switching tube.
8. a heat abstractor, it is characterised in that described heat abstractor includes the multi-mode fan control circuitry as described in any one of claim 1 to 7.
9. an electronic equipment, it is characterised in that described electronic equipment includes heat abstractor as claimed in claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510013209.6A CN105822578B (en) | 2015-01-09 | 2015-01-09 | A kind of multi-mode fan control circuitry, heat abstractor and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510013209.6A CN105822578B (en) | 2015-01-09 | 2015-01-09 | A kind of multi-mode fan control circuitry, heat abstractor and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105822578A true CN105822578A (en) | 2016-08-03 |
| CN105822578B CN105822578B (en) | 2017-09-08 |
Family
ID=56514283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510013209.6A Active CN105822578B (en) | 2015-01-09 | 2015-01-09 | A kind of multi-mode fan control circuitry, heat abstractor and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105822578B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592059A (en) * | 2017-09-19 | 2018-01-16 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of temperature protective device, method, storage medium and equipment |
| CN107906486A (en) * | 2018-02-06 | 2018-04-13 | 贵州德江韫韬科技有限责任公司 | A kind of Road lamp for garden control system |
| CN109630453A (en) * | 2019-02-28 | 2019-04-16 | 苏州浪潮智能科技有限公司 | A kind of fan control system and server |
| CN110333003A (en) * | 2019-07-02 | 2019-10-15 | 三江学院 | NTC temperature linearity sample circuit |
| CN113133286A (en) * | 2021-04-19 | 2021-07-16 | 西安易朴通讯技术有限公司 | Heat dissipation control method, device, equipment and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000294968A (en) * | 1999-04-05 | 2000-10-20 | Yokogawa Electric Corp | Fan control circuit |
| US20030011984A1 (en) * | 2001-07-13 | 2003-01-16 | Chu Herman W. | Method and system for controlling a cooling fan within a computer system |
| CN2708396Y (en) * | 2004-06-25 | 2005-07-06 | 联想(北京)有限公司 | Temperature controller for computer power supply |
| CN1749923A (en) * | 2002-09-12 | 2006-03-22 | 联想(北京)有限公司 | Active control computer system heat radiation and silencing method |
| CN202612162U (en) * | 2012-05-15 | 2012-12-19 | 中国长城计算机深圳股份有限公司 | Power-type fan rotational speed control circuit and fan device |
| CN204419661U (en) * | 2015-01-09 | 2015-06-24 | 中国长城计算机深圳股份有限公司 | A kind of multi-mode fan control circuitry, sink and electronic equipment |
-
2015
- 2015-01-09 CN CN201510013209.6A patent/CN105822578B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000294968A (en) * | 1999-04-05 | 2000-10-20 | Yokogawa Electric Corp | Fan control circuit |
| US20030011984A1 (en) * | 2001-07-13 | 2003-01-16 | Chu Herman W. | Method and system for controlling a cooling fan within a computer system |
| CN1749923A (en) * | 2002-09-12 | 2006-03-22 | 联想(北京)有限公司 | Active control computer system heat radiation and silencing method |
| CN2708396Y (en) * | 2004-06-25 | 2005-07-06 | 联想(北京)有限公司 | Temperature controller for computer power supply |
| CN202612162U (en) * | 2012-05-15 | 2012-12-19 | 中国长城计算机深圳股份有限公司 | Power-type fan rotational speed control circuit and fan device |
| CN204419661U (en) * | 2015-01-09 | 2015-06-24 | 中国长城计算机深圳股份有限公司 | A kind of multi-mode fan control circuitry, sink and electronic equipment |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592059A (en) * | 2017-09-19 | 2018-01-16 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of temperature protective device, method, storage medium and equipment |
| CN107906486A (en) * | 2018-02-06 | 2018-04-13 | 贵州德江韫韬科技有限责任公司 | A kind of Road lamp for garden control system |
| CN109630453A (en) * | 2019-02-28 | 2019-04-16 | 苏州浪潮智能科技有限公司 | A kind of fan control system and server |
| CN110333003A (en) * | 2019-07-02 | 2019-10-15 | 三江学院 | NTC temperature linearity sample circuit |
| CN113133286A (en) * | 2021-04-19 | 2021-07-16 | 西安易朴通讯技术有限公司 | Heat dissipation control method, device, equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105822578B (en) | 2017-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105822578A (en) | Multi-mode fan control circuit, cooling device and electronic equipment | |
| US8254074B2 (en) | Power control circuit | |
| WO2014194810A1 (en) | Portable device capable of controlling output characteristics of adaptor, and corresponding method | |
| CN204423290U (en) | A kind of system closedown automatic heat radiation circuit, heat abstractor and electronic equipment | |
| CN204419661U (en) | A kind of multi-mode fan control circuitry, sink and electronic equipment | |
| CN204376697U (en) | The circuit of electric equipment and reduction Switching Power Supply stand-by power consumption | |
| CN101956724B (en) | Fan drive device and fan system | |
| CN204259262U (en) | A kind of overtemperature protection module of LED actuation temperature warning circuit | |
| US20110094724A1 (en) | Temperature control circuit | |
| CN205141635U (en) | Motor overheat protects warning circuit | |
| US20110235219A1 (en) | Protecting device | |
| CN105822585A (en) | Multi-mode fan control circuit with delay function, cooling device and electronic equipment | |
| CN216812248U (en) | Control circuit of cooling fan, cooling device and power supply equipment | |
| CN204419662U (en) | A kind of can the multi-mode fan control circuitry of time delay, sink and electronic equipment | |
| CN204376717U (en) | Dummy load control circuit and inverse-excitation type switch power-supply circuit | |
| CN212932769U (en) | Mobile hard disk low-voltage detection circuit and mobile hard disk | |
| US20110255317A1 (en) | Intelligent multi-stage variable-power switch power supply device | |
| CN101242699B (en) | Intelligent heat radiation control device for non-pole lamp rectifier | |
| CN204943664U (en) | A kind of carbon fiber eclectic heating temperature controller | |
| CN203406647U (en) | Electric car charger with temperature control fan | |
| CN203691703U (en) | Device for controlling surge current of LED module | |
| CN102758786B (en) | Fan circuit | |
| CN103362838B (en) | A kind of computer and radiation fan drive delay control circuit | |
| US20080007304A1 (en) | AC-to-DC power circuit | |
| CN211404485U (en) | Semiconductor heat dissipation circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 518000 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Applicant after: China the Great Wall science and technology group Limited by Share Ltd Address before: 518000 the Great Wall computer building, 3 FA FA Road, Nanshan District science and Technology Park, Guangdong, Shenzhen Applicant before: China Changcheng Computer Shenzhen Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200612 Address after: No. 96, Yangxing South Street, stainless steel economic Park, Taiyuan City, Shanxi Province Patentee after: Shanxi Great Wall Computer System Co., Ltd Address before: 518000 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee before: CHINA GREATWALL COMPUTER SHENZHEN Co.,Ltd. |