CN103671183A - Computer fan control system - Google Patents
Computer fan control system Download PDFInfo
- Publication number
- CN103671183A CN103671183A CN201210335778.9A CN201210335778A CN103671183A CN 103671183 A CN103671183 A CN 103671183A CN 201210335778 A CN201210335778 A CN 201210335778A CN 103671183 A CN103671183 A CN 103671183A
- Authority
- CN
- China
- Prior art keywords
- effect transistor
- field effect
- triode
- resistance
- electrically connected
- 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.)
- Pending
Links
- 230000005669 field effect Effects 0.000 claims description 69
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Direct Current Motors (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
A computer fan control system comprises a computer main board and a fan arranged on the computer main board. The computer main board is provided with an input and output controller and a control circuit electrically connected with the input and output controller. A motor and a rotation speed sensing chip which are electrically connected with the control circuit are arranged in the fan. A rotation speed control signal is output by the input and output controller and received by the control circuit. A fan driving signal is output by the control circuit according to the rotation speed control signal and received by the motor, so that therefore the fan is controlled by the motor to rotate at a corresponding rotation speed and in the corresponding direction according to the fan driving signal.
Description
Technical field
The present invention relates to a kind of control system, relate in particular to a kind of computer fan control system.
Background technique
Develop rapidly along with computer technology, computer system will be carried out a large amount of calculation process conventionally, the heat producing when task is busy also increases gradually, only according to radiation hole and radiating fin, cannot solve heat dissipation problem, on active heat removal equipment, the air-cooled technology that cost performance is higher is the radiating mode that computer system the most often adopts always, existing a kind of intelligent fan utilizes pulse duration modulation (Pulse Width Modulation, PWM) signal, according to the duty of input output control chip (Super I/O, SIO) control pwm signal, recently control the rotating speed of fan.Traditional intelligent fan is conventionally built-in with and drives chip and auxiliary cicuit, taken space larger in fan, is unfavorable for that the internal structure of fan designs and improved the manufacture cost of fan.
Summary of the invention
In view of above content, be necessary to provide a kind of computer fan control system of simplifying fan structure.
A kind of computer fan control system, comprise a computer main board and be installed on the fan on described computer main board, on described computer main board, lay a control circuit of an IOC and the described IOC of electric connection, in described fan, establish the motor and the rotating speed sensor chip that are electrically connected described control circuit, described IOC is exported a speed controling signal, described control circuit receives described speed controling signal, and export a fans drive signal according to described speed controling signal, described motor receives described fans drive signal, and rotate with corresponding rotating speed and direction according to fan described in described fans drive SC sigmal control.
Compared with prior art, above-mentioned computer fan control system is exported a speed controling signal by described IOC, described control circuit receives described speed controling signal, and export a fans drive signal according to described speed controling signal, described motor receives described fans drive signal, and rotates with corresponding rotating speed and direction according to fan described in described fans drive SC sigmal control.Because described fan no longer comprises, drive chip and auxiliary cicuit, the internal structure of having simplified described fan designs and has reduced the manufacture cost of described fan.
Accompanying drawing explanation
Fig. 1 is the block diagram of computer fan control system better embodiment of the present invention.
Fig. 2 is the circuit diagram of Fig. 1.
Primary component symbol description
| Computer |
100 |
| |
110 |
| The first control signal output terminal | 111 |
| The second control signal output terminal | 112 |
| The 3rd control signal output terminal | 113 |
| The 4th control signal output terminal | 114 |
| Feedback signal receiving terminal | 115 |
| Current signal receiving terminal | 116 |
| |
120 |
| Triode | T1-T4 |
| Resistance | R1-R13 |
| Field effect transistor | Q1-Q4 |
| Diode | D1-D4 |
| Fan | 200 |
| |
210 |
| First input end | 211 |
| The second input end | 212 |
| Rotating |
220 |
| Tach signal output terminal | 221 |
| Grounding end | 222 |
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, a better embodiment of computer fan control system of the present invention comprises a computer main board 100 and is installed on the fan 200 on described computer main board 100.On described computer main board 100, lay a control circuit 120 of an IOC 110 and the described IOC 110 of electric connection.In described fan 200, establish the motor 210 and the rotating speed sensor chip 220 that are electrically connected described control circuit 120.Described IOC 110 output one speed controling signal and pulse-width signals.Described control circuit 120 receives described speed controling signal and pulse-width signal, and exports a fans drive signal according to described speed controling signal.Described motor 210 receives described fans drive signal, and rotates with corresponding rotating speed and direction according to fan 200 described in described fans drive SC sigmal control.The rotation of fan 200 described in described rotating speed sensor chip 220 sensings, and export a speed feedback signal according to the rotating speed of described fan 200.Described IOC 110 receives described speed feedback signal, and according to described speed feedback signal, adjusts the dutycycle of described pulse-width signal, and then realizes the rotating speed of described fan 200 is controlled.
Refer to Fig. 2, described IOC 110 comprises one first control signal output terminal 111, one second control signal output terminal 112, one the 3rd control signal output terminal 113, one the 4th control signal output terminal 114, a feedback signal receiving terminal 115 and a current signal receiving terminal 116.Described control circuit 120 comprises some triode T1-T4, some resistance R 1-R13, some field effect transistor Q1-Q4 and some diode D1-D4.
Described the first control signal output terminal 111 receives one first VDC via described resistance R 1.Described the first control signal output terminal 111 is electrically connected the base stage of described triode T1 via described resistance R 2.Described triode T1 grounded-emitter connection.The collector electrode of described triode T1 is electrically connected the grid of described field effect transistor Q1.The collector electrode of described triode T1 receives one second VDC via described resistance R 3.The drain electrode of described field effect transistor Q1 receives described the second VDC.The drain electrode of described field effect transistor Q1 is electrically connected the negative electrode of described diode D1.The anode of described diode D1 is electrically connected the source electrode of described field effect transistor Q1.
Described the second control signal output terminal 112 receives described the first VDC via described resistance R 4.Described the second control signal output terminal 112 is electrically connected the base stage of described triode T2 via described resistance R 5.Described triode T2 grounded-emitter connection.The collector electrode of described triode T2 is electrically connected the grid of described field effect transistor Q2.The collector electrode of described triode T2 receives described the second VDC via described resistance R 6.The drain electrode of described field effect transistor Q2 receives described the second VDC.The drain electrode of described field effect transistor Q2 is electrically connected the negative electrode of described diode D2.The anode of described diode D2 is electrically connected the source electrode of described field effect transistor Q2.
Described the 3rd control signal output terminal 113 receives described the first VDC via described resistance R 7.Described the 3rd control signal output terminal 113 is electrically connected the base stage of described triode T3 via described resistance R 8.Described triode T3 grounded-emitter connection.The collector electrode of described triode T3 is electrically connected the grid of described field effect transistor Q3.The collector electrode of described triode T3 receives described the second VDC via described resistance R 9.The drain electrode of described field effect transistor Q3 is electrically connected the source electrode of described field effect transistor Q1.The drain electrode of described field effect transistor Q3 is electrically connected the negative electrode of described diode D3.The anode of described diode D3 is electrically connected the source electrode of described field effect transistor Q3.
Described the 4th control signal output terminal 114 receives described the first VDC via described resistance R 10.Described the 4th control signal output terminal 114 is electrically connected the base stage of described triode T4 via described resistance R 11.Described triode T4 grounded-emitter connection.The collector electrode of described triode T4 is electrically connected the grid of described field effect transistor Q4.The collector electrode of described triode T4 receives described the second VDC via described resistance R 12.The drain electrode of described field effect transistor Q4 is electrically connected the source electrode of described field effect transistor Q2.The drain electrode of described field effect transistor Q4 is electrically connected the negative electrode of described diode D4.The anode of described diode D4 is electrically connected the source electrode of described field effect transistor Q4.The source electrode of the source electrode of described field effect transistor Q4 and described field effect transistor Q3 is electrical connected by by described resistance R 13 ground connection.Connected node between the source electrode of the source electrode of described field effect transistor Q4 and described field effect transistor Q3 is electrically connected described current signal receiving terminal 116.
Described motor 210 comprises a first input end 211 and one second input end 212.The connected node that described first input end 211 is electrically connected between the source electrode of described field effect transistor Q1 and the drain electrode of described field effect transistor Q3.The connected node that described the second input end 212 is electrically connected between the source electrode of described field effect transistor Q2 and the drain electrode of described field effect transistor Q4.Described rotating speed sensor chip 220 comprises a tach signal output terminal 221 and a grounding end 222.Described tach signal output terminal 221 is electrically connected described feedback signal receiving terminal 115.Described grounding end 222 ground connection.Wherein, the standby voltage that described the first VDC is one+3V.The voltage that described the second VDC is one+12V.Described triode T1-T4 is NPN type triode.Described field effect transistor Q1-Q4 is N slot field-effect transistor.
During work, when the control signal of described IOC 110 at described the first control signal output terminal 111 and the 4th control signal output terminal 114 output low potentials, simultaneously when the control signal of described the second control signal output terminal 112 and the 3rd control signal output terminal 113 output high petentials, described triode T1 and T4 cut-off, described triode T2 and T3 conducting.The grid of described field effect transistor Q1 and Q4 receives the second VDC of high petential.Described field effect transistor Q1 and Q4 conducting.The grid of described field effect transistor Q2 and Q3 is respectively via described triode T2 and T3 ground connection.Described field effect transistor Q2 and Q3 cut-off.Described the second VDC flows into described motor 210 via described field effect transistor Q1 from described first input end 211, and described the second VDC is flowed through after described motor 210 and flowed into described field effect transistor Q4 from described the second input end 212.Described motor 210 drives described fan 200 to rotate along a first direction.Described IOC 110 output pulse width modulation signals regulate the size of described the second VDC, described fan 200 according to the size of described the second VDC along described first direction with corresponding rotational speed.
When the control signal of described IOC 110 at described the first control signal output terminal 111 and the 4th control signal output terminal 114 output high petentials, simultaneously when the control signal of described the second control signal output terminal 112 and the 3rd control signal output terminal 113 output low potentials, described triode T1 and T4 conducting, described triode T2 and T3 cut-off.The grid of described field effect transistor Q1 and Q4 is respectively via described triode T1 and T4 ground connection.Described field effect transistor Q1 and Q4 cut-off.The grid of described field effect transistor Q2 and Q3 receives the second VDC of high petential.Described field effect transistor Q2 and Q3 conducting.Described the second VDC flows into described motor 210 via described field effect transistor Q2 from described the second input end 212, and described the second VDC is flowed through after described motor 210 and flowed into described field effect transistor Q3 from described first input end 211.Described motor 210 drive described fan 200 along a second direction with corresponding rotational speed.Wherein, described first direction and second direction are contrary.
In the rotation process of described fan 200, the rotating speed of fan 200 described in described rotating speed sensor chip 220 sensings.Described rotating speed sensor chip 220 is at described tach signal output terminal 221 output one speed feedback signals.The feedback signal receiving terminal 115 of described IOC 110 receives described speed feedback signal.Described IOC 110 is adjusted the dutycycle of described pulse-width signal according to described speed feedback signal.Described the second VDC regulates according to the variation of the dutycycle of described pulse-width signal, and then realizes the rotating speed of described fan 200 is controlled.Meanwhile, described IOC 110 by described current signal receiving terminal 116 acquisition stream the current signal through described fan 200.Wherein, described diode D1-D4 shields to described field effect transistor Q1-Q4 respectively, in order to offset when described motor 210 power-off negative pressure in the generation of the two ends of described field effect transistor Q1-Q4.
Computer fan control system of the present invention is by described IOC 110 output one speed controling signals.Described control circuit 120 receives described speed controling signal, and exports a fans drive signal according to described speed controling signal.Described motor 210 receives described fans drive signal, and rotate with corresponding rotating speed and direction according to fan 200 described in described fans drive SC sigmal control, because described fan 200 no longer comprises, drive chip and auxiliary cicuit, the internal structure of having simplified described fan 200 designs and has reduced the manufacture cost of described fan 200.
Claims (9)
1. a computer fan control system, comprise a computer main board and be installed on the fan on described computer main board, it is characterized in that: a control circuit of laying an IOC and the described IOC of electric connection on described computer main board, in described fan, establish the motor and the rotating speed sensor chip that are electrically connected described control circuit, described IOC is exported a speed controling signal, described control circuit receives described speed controling signal, and export a fans drive signal according to described speed controling signal, described motor receives described fans drive signal, and rotate with corresponding rotating speed and direction according to fan described in described fans drive SC sigmal control.
2. computer fan control system as claimed in claim 1, it is characterized in that: described IOC is exported a pulse-width signal, the rotation of fan described in described rotating speed sensor chip sensing, and export a speed feedback signal according to the rotating speed of described fan, described IOC receives described speed feedback signal, and according to described speed feedback signal, adjust the dutycycle of described pulse-width signal, and then realize the rotating speed of described fan is controlled.
3. computer fan control system as claimed in claim 1, it is characterized in that: described IOC comprises one first control signal output terminal, described control circuit comprises one first triode, one first resistance, one second resistance and one first field effect transistor, described motor comprises a first input end, described the first control signal output terminal receives one first VDC via described the first resistance, described the first control signal output terminal is electrically connected the base stage of described the first triode, described the first triode grounded-emitter connection, the collector electrode of described the first triode is electrically connected the grid of described the first field effect transistor, the collector electrode of described the first triode receives one second VDC via described the second resistance, the drain electrode of described the first field effect transistor receives described the second VDC, the source electrode of described the first field effect transistor is electrically connected described first input end.
4. computer fan control system as claimed in claim 3, it is characterized in that: described IOC also comprises one the 4th control signal output terminal, described control circuit also comprises one second triode, one the 3rd resistance, one the 4th resistance, one the 5th resistance and one second field effect transistor, described motor also comprises one second input end, described the 4th control signal output terminal receives described the first VDC via described the 3rd resistance, described the 4th control signal output terminal is electrically connected the base stage of described the second triode, described the second triode grounded-emitter connection, the collector electrode of described the second triode is electrically connected the grid of described the second field effect transistor, the collector electrode of described the second triode receives described the second VDC via described the 4th resistance, the drain electrode of described the second field effect transistor is electrically connected described the second input end, the source electrode of described the second field effect transistor is via described the 5th resistance eutral grounding.
5. computer fan control system as claimed in claim 4, it is characterized in that: described IOC also comprises one second control signal output terminal, described control circuit also comprises one the 3rd triode, one the 6th resistance, one the 7th resistance and one the 3rd field effect transistor, described the second control signal output terminal receives described the first VDC via described the 6th resistance, described the second control signal output terminal is electrically connected the base stage of described the 3rd triode, described the 3rd triode grounded-emitter connection, the collector electrode of described the 3rd triode is electrically connected the grid of described the 3rd field effect transistor, the collector electrode of described the 3rd triode receives described the second VDC via described the 7th resistance, the drain electrode of described the 3rd field effect transistor receives described the second VDC, the source electrode of described the 3rd field effect transistor is electrically connected the drain electrode of described the second field effect transistor.
6. computer fan control system as claimed in claim 5, it is characterized in that: described IOC also comprises one the 3rd control signal output terminal, described control circuit also comprises one the 4th triode, one the 8th resistance, one the 9th resistance and one the 4th field effect transistor, described the 3rd control signal output terminal receives described the first VDC via described the 8th resistance, described the 3rd control signal output terminal is electrically connected the base stage of described the 4th triode, described the 4th triode grounded-emitter connection, the collector electrode of described the 4th triode is electrically connected the grid of described the 4th field effect transistor, the collector electrode of described the 4th triode receives described the second VDC via described the 9th resistance, the drain electrode of described the 4th field effect transistor is electrically connected the source electrode of described the first field effect transistor, the source electrode of described the 4th field effect transistor is electrically connected the source electrode of described the second field effect transistor and the connected node between described the 5th resistance.
7. computer fan control system as claimed in claim 2, it is characterized in that: described IOC also comprises a feedback signal receiving terminal, described rotating speed sensor chip comprises a tach signal output terminal, and described tach signal output terminal is electrically connected described feedback signal receiving terminal to export described speed feedback signal.
8. computer fan control system as claimed in claim 4, it is characterized in that: described IOC also comprises a current signal receiving terminal, the connected node between the source electrode of described the second field effect transistor and described the 5th resistance be electrically connected described current signal receiving terminal with output stream the current signal through described fan.
9. computer fan control system as claimed in claim 6, it is characterized in that: the standby voltage that described the first VDC is one+3V, the voltage that described the second VDC is one+12V, described the first triode, the second triode, the 3rd triode and the 4th triode are NPN type triode, and described the first field effect transistor, the second field effect transistor, the 3rd field effect transistor and the 4th field effect transistor are N slot field-effect transistor.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210335778.9A CN103671183A (en) | 2012-09-12 | 2012-09-12 | Computer fan control system |
| TW101134855A TW201411320A (en) | 2012-09-12 | 2012-09-21 | Control system for fan |
| US13/913,619 US20140072449A1 (en) | 2012-09-12 | 2013-06-10 | Fan control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210335778.9A CN103671183A (en) | 2012-09-12 | 2012-09-12 | Computer fan control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103671183A true CN103671183A (en) | 2014-03-26 |
Family
ID=50233461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210335778.9A Pending CN103671183A (en) | 2012-09-12 | 2012-09-12 | Computer fan control system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20140072449A1 (en) |
| CN (1) | CN103671183A (en) |
| TW (1) | TW201411320A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972857A (en) * | 2013-01-28 | 2014-08-06 | 鸿富锦精密工业（深圳）有限公司 | Fan control chip protection circuit |
| JP2016144344A (en) * | 2015-02-03 | 2016-08-08 | 平田機工株式会社 | Control apparatus, robot, and control method |
| CN106321478A (en) * | 2015-06-22 | 2017-01-11 | 鸿富锦精密工业(武汉)有限公司 | Fan control system |
| CN109505791B (en) * | 2018-06-27 | 2024-02-09 | 成都富强电子电器科技有限公司 | Intelligent controller of fire-fighting double-speed fan |
| TWI699633B (en) * | 2019-06-12 | 2020-07-21 | 英業達股份有限公司 | Method for controlling rotational speed of device |
| US11567477B2 (en) * | 2020-08-31 | 2023-01-31 | Sea Sonic Electronics Co., Ltd. | Fan driving circuit with temperature compensation |
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| US20030175017A1 (en) * | 2002-03-13 | 2003-09-18 | Pelonis Kosta L. | DC motor constant speed PWM control |
| CN1721704A (en) * | 2004-07-12 | 2006-01-18 | 台达电子工业股份有限公司 | Fan control system using a microcontroller |
| CN101063887A (en) * | 2006-04-27 | 2007-10-31 | 环达电脑(上海)有限公司 | Method for controlling rotate speed of computer cooling fan and system thereof |
| CN101819456A (en) * | 2010-04-15 | 2010-09-01 | 鲁东大学 | Method for reducing dust on cooling fan blades of computer and circuit for realizing same |
| CN102042248A (en) * | 2009-10-10 | 2011-05-04 | 建准电机工业股份有限公司 | Control system for fan |
| CN102116304A (en) * | 2010-01-05 | 2011-07-06 | 建准电机工业股份有限公司 | Fan system and brake circuit thereof |
| CN102192175A (en) * | 2010-03-01 | 2011-09-21 | 纬创资通股份有限公司 | Fan control system and method for modulating rotation speed of fan |
| CN102201764A (en) * | 2010-03-24 | 2011-09-28 | 安森美半导体贸易公司 | Motor drive circuit and lighting device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129260B (en) * | 2010-01-20 | 2014-09-17 | 鸿富锦精密工业（深圳）有限公司 | Fan driving circuit |
-
2012
- 2012-09-12 CN CN201210335778.9A patent/CN103671183A/en active Pending
- 2012-09-21 TW TW101134855A patent/TW201411320A/en unknown
-
2013
- 2013-06-10 US US13/913,619 patent/US20140072449A1/en not_active Abandoned
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030175017A1 (en) * | 2002-03-13 | 2003-09-18 | Pelonis Kosta L. | DC motor constant speed PWM control |
| CN1721704A (en) * | 2004-07-12 | 2006-01-18 | 台达电子工业股份有限公司 | Fan control system using a microcontroller |
| CN101063887A (en) * | 2006-04-27 | 2007-10-31 | 环达电脑(上海)有限公司 | Method for controlling rotate speed of computer cooling fan and system thereof |
| CN102042248A (en) * | 2009-10-10 | 2011-05-04 | 建准电机工业股份有限公司 | Control system for fan |
| CN102116304A (en) * | 2010-01-05 | 2011-07-06 | 建准电机工业股份有限公司 | Fan system and brake circuit thereof |
| CN102192175A (en) * | 2010-03-01 | 2011-09-21 | 纬创资通股份有限公司 | Fan control system and method for modulating rotation speed of fan |
| CN102201764A (en) * | 2010-03-24 | 2011-09-28 | 安森美半导体贸易公司 | Motor drive circuit and lighting device |
| CN101819456A (en) * | 2010-04-15 | 2010-09-01 | 鲁东大学 | Method for reducing dust on cooling fan blades of computer and circuit for realizing same |
Also Published As
| Publication number | Publication date |
|---|---|
| US20140072449A1 (en) | 2014-03-13 |
| TW201411320A (en) | 2014-03-16 |
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Application publication date: 20140326 |