CN104454603A - Electronic device and fan driving circuit thereof - Google Patents
Electronic device and fan driving circuit thereof Download PDFInfo
- Publication number
- CN104454603A CN104454603A CN201310420177.2A CN201310420177A CN104454603A CN 104454603 A CN104454603 A CN 104454603A CN 201310420177 A CN201310420177 A CN 201310420177A CN 104454603 A CN104454603 A CN 104454603A
- Authority
- CN
- China
- Prior art keywords
- voltage
- fan
- stabiliser tube
- electric capacity
- drive circuit
- 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
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/01—Purpose of the control system
- F05D2270/02—Purpose of the control system to control rotational speed (n)
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The invention provides an electronic device and a fan driving circuit thereof. The fan driving circuit comprises an MCU, a power supply interface, a first resistor, a field-effect tube, a first voltage-regulator tube and a first capacitor, wherein the grid of the field-effect tube is connected with the MCU, and is grounded through the first resistor; the source of the field-effect tube is grounded; the drain of the field-effect tube is connected with the anode of the first voltage-regulator tube, and is connected with a voltage port; the cathode of the first voltage-regulator tube is connected with the positive pole end of a fan and one end of the first capacitor; and the other end of the first capacitor and the negative pole end of the fan are grounded. When a PWM signal generated by the MCU is in low level, the field-effect tube is cut off, the first voltage-regulator tube is conducted, power supply voltage accessed by the power supply interface supplies power to the fan through the first voltage-regulator tube to enable the fan to rotate, and the first capacitor is charged; and along with the prolonging of the charging time of the first capacitor, the working voltage of the fan rises to control the rotating speed of the fan. The electronic device and the fan driving circuit thereof are simple in structure, and save the costs.
Description
Technical field
The present invention relates to a kind of electronic equipment and fan drive circuit thereof, particularly relate to a kind of electronic equipment and the fan drive circuit thereof that utilize the simple drive fan of structure.
Background technique
Current portable electron device utilizes the rotating speed of booster circuit and pwm control circuit drived control fan respectively.As shown in Figure 1, be the circuit structure diagram of the fan drive circuit in existing electronic equipment 1.This electronic equipment 1 comprises booster circuit 10, pulse width modulation (PWM) control circuit 20 and a fan 30.Booster circuit 10, for the operating voltage of voltage source being raised, is generally and is increased to 12V from 5V, and 12V operating voltage is provided to pwm control circuit 20.Described pwm control circuit 20 is connected between described fan and described booster circuit 10, produces the rotation that a pwm signal controls fan 30 for receiving this booster circuit 10 output terminal operating voltage.Concrete, this pwm control circuit 20 comprises a micro-control unit (MCU) 201,1 first resistance 202,1 first triode 203,1 second resistance 204,1 second triode 205, the 3rd resistance 206,1 the 4th resistance 207,1 first electric capacity 208 and one second electric capacity 209.The base stage of described first triode 203 connects described MCU201 by described first resistance 202.The emitter grounding of described first triode 203, collector electrode connects the base electrode of the second triode 205 and one end of the first electric capacity 208 by described second resistance 204.The base stage of described second triode 205 also connects booster circuit 10 by the 4th resistance 207.Other one end ground connection of described first electric capacity 208.The emitter-base bandgap grading of described second triode 205 connects fan 30, and collector electrode connects booster circuit 10 by the 3rd resistance 206.One end of second electric capacity 209 connects the radio pole of the second triode 205, the other end ground connection.
During work, MCU201 produces the pwm signal that has a fixed duty cycle, when pwm signal is high level, first triode 203 conducting, second triode 205 base electrode is high level, thus make the second triode 205 conducting, the operating voltage that this booster circuit 10 produces is that the second electric capacity 209 charges by this second triode, and provide operating voltage to fan 30, control fan 30 to rotate, duration of charge along with the second electric capacity 209 makes the operating voltage of fan 30 raise, thus controls the rotating speed of fan 30; And when pwm signal is low level, the first triode 203 ends, the second triode 205 base electrode voltage is identical with emitter voltage, thus the second triode 205 is ended, thus control fan 30 stops operating.But, in prior art, control the rotation of fan 30 and the special booster voltage 10 of rotating speed needs, complex structure, and add cost.
Summary of the invention
The invention provides a kind of electronic equipment and fan drive circuit thereof.
A kind of fan drive circuit, for controlling rotation and the rotating speed of a fan, comprise a micro-control unit MCU and a power interface, this MCU has the pwm signal of fixed duty cycle for generation of one, and this power interface is for accessing supply voltage.This fan drive circuit also comprises one first resistance, one field effect transistor, one first voltage-stabiliser tube, and one first electric capacity, the grid of field effect transistor connects MCU, simultaneously also by the first resistance eutral grounding, the source ground of field effect transistor, drain electrode is connected with the anode of the first voltage-stabiliser tube and is connected with this voltage port simultaneously, the negative electrode of the first voltage-stabiliser tube connects the positive terminal of fan and one end of the first electric capacity, the other end of the first electric capacity and the negative pole end ground connection of fan, wherein, when the pwm signal that MCU produces is low level, field effect transistor ends, the supply voltage of this power interface access exports the anode of the first voltage-stabiliser tube to and controls this first voltage-stabiliser tube conducting, the supply voltage that this power interface accesses also is powered to fan by this first voltage-stabiliser tube, make fan turns, simultaneously, to the first capacitor charging, along with the increase in the duration of charge of the first electric capacity, the operating voltage of fan is raised, thus control the rotating speed of fan.
A kind of electronic equipment, comprise a power supply, a fan drive circuit and a fan, this fan drive circuit is for controlling rotation and the rotating speed of a fan, comprise a micro-control unit MCU and a power interface, this MCU has the pwm signal of fixed duty cycle for generation of one, and this power interface is for accessing supply voltage.This fan drive circuit also comprises one first resistance, one field effect transistor, one first voltage-stabiliser tube, and one first electric capacity, the grid of field effect transistor connects MCU, simultaneously also by the first resistance eutral grounding, the source ground of field effect transistor, drain electrode is connected with the anode of the first voltage-stabiliser tube and is connected with this voltage port simultaneously, the negative electrode of the first voltage-stabiliser tube connects the positive terminal of fan and one end of the first electric capacity, the other end of the first electric capacity and the negative pole end ground connection of fan, wherein, when the pwm signal that MCU produces is low level, field effect transistor ends, the supply voltage of this power interface access exports the anode of the first voltage-stabiliser tube to and controls this first voltage-stabiliser tube conducting, the supply voltage that this power interface accesses also is powered to fan by this first voltage-stabiliser tube, make fan turns, simultaneously, to the first capacitor charging, along with the increase in the duration of charge of the first electric capacity, the operating voltage of fan is raised, thus control the rotating speed of fan.
Electronic equipment of the present invention and fan drive circuit thereof, utilize the simple drive fan of structure, saved cost.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram for existing fan drive circuit.
Fig. 2 is the circuit structure diagram of the electronic equipment under the preferred embodiment for the present invention with fan drive circuit.
Primary component symbol description
| Electronic equipment | 1，1’ |
| Booster circuit | 10 |
| Pwm control circuit | 20 |
| Fan | 30 |
| MCU | 201 |
| First resistance | 202 |
| First triode | 203 |
| Second resistance | 204 |
| Second triode | 205 |
| 3rd resistance | 206 |
| 4th resistance | 207 |
| First electric capacity | 208 |
| Second electric capacity | 209 |
| Fan drive circuit | 40 |
| Power interface | 400 |
| MCU | 401 |
| First resistance | 402 |
| Field effect transistor | 403 |
| First voltage-stabiliser tube | 405 |
| First electric capacity | 406 |
| Diode | 407 |
| Second voltage-stabiliser tube | 408 |
| Second electric capacity | 409 |
| Positive terminal | 301 |
| Negative pole end | 302 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Referring to Fig. 2, is the electronic equipment 1 ' circuit structure diagram with fan drive circuit under the preferred embodiment for the present invention.This electronic equipment 1 ' comprises fan 30 and a fan drive circuit 40.This fan drive circuit 40 is for controlling rotation and the rotating speed of fan 30.Concrete, the model of fan is CN703.
Fan drive circuit 40 comprises power interface 400, MCU (micro-control unit) 401,1 first resistance 402, one field effect transistor 403,1 first voltage-stabiliser tube 405,1 first electric capacity 406.
The grid of field effect transistor 403 connects MCU401, simultaneously also by the first resistance 402 ground connection.The source ground of field effect transistor 403, is electrically connected with voltage port 400 while that drain electrode being connected with the anode of the first voltage-stabiliser tube 405.The negative electrode of the first voltage-stabiliser tube 405 connects the positive terminal 301 of fan 30 and one end of the first electric capacity 406.The other end of the first electric capacity 406 and negative pole end 302 ground connection of fan 30.This power port 400 is for accessing power source voltage Vcc.Concrete, this power interface 400 can be connected with battery and obtain supply voltage, and this power interface 400 also can be connected with power supply adaptor and obtain supply voltage.
In the present embodiment, this field effect transistor 403 is N-type field effect transistor.
During work, MCU401 produces the pwm signal that has a fixed duty cycle, and when pwm signal is low level, field effect transistor 403 ends.The power supply pressure side Vcc of this power interface 400 access exports the anode of the first voltage-stabiliser tube 405 to and controls this first voltage-stabiliser tube 405 conducting, this power source voltage Vcc powers to fan 30 by this first voltage-stabiliser tube 405 then, fan 30 is rotated, simultaneously, charge to the first electric capacity 406, along with the increase in the duration of charge of the first electric capacity 406, the operating voltage of fan 30 is raised, thus control the rotating speed of fan 30.When pwm signal is high level, field effect transistor 403 conducting, thus the anode of this first voltage-stabiliser tube 405 is by field effect transistor 405 ground connection of this conducting, the corresponding cut-off of this first voltage-stabiliser tube 405, the power source voltage Vcc that power interface 400 accesses stops powering to fan 30, and fan 30 is stopped operating.
The reverse cutoff function of the first voltage-stabiliser tube 405 makes the first electric capacity 406 when pwm signal is low level, do not discharge, thus the first electric capacity 406 can only continue discharge to fan 30 and power to fan 30 by the first voltage-stabiliser tube 405.
This fan drive circuit 40 also comprises diode 407 and one second voltage-stabiliser tube 408.The anode of diode 407 connects the negative electrode of described first voltage-stabiliser tube 405, and negative electrode connects the negative electrode of the second voltage-stabiliser tube 408.The plus earth of the second voltage-stabiliser tube 408.Diode 407 and the second voltage-stabiliser tube 408 have the effect of two-way stop, when the first electric capacity 406 is powered to fan 30 when pwm signal is low level, carry out voltage stabilizing to the voltage that this first electric capacity 406 exports.
Because the first electric capacity 406 is when pwm signal is low level, do not discharge by the first voltage-stabiliser tube 405 and can only power to fan 30, the electric energy therefore on the first electric capacity 406 is added up, thus improves the operating voltage of fan 30, thus controls the wind speed of fan 30.
This fan drive circuit 40 also comprises one second electric capacity 409.One end of second electric capacity 409 connects voltage port 400, the other end ground connection, carries out filtering for the supply voltage that voltage port 400 accessed and electric current.
Compared to Figure 1, this fan drive circuit 40 does not need special booster circuit, just can promote the operating voltage of fan 30, controls rotation and the rotating speed of fan 30.
Claims (10)
1. a fan drive circuit, for controlling rotation and the rotating speed of a fan, comprise a micro-control unit MCU and a power interface, this MCU has the pwm signal of fixed duty cycle for generation of one, and this power interface, for accessing supply voltage, is characterized in that:
This fan drive circuit also comprises one first resistance, a field effect transistor, one first voltage-stabiliser tube and one first electric capacity, the grid of field effect transistor connects MCU, simultaneously also by the first resistance eutral grounding, the source ground of field effect transistor, drain electrode is connected with the anode of the first voltage-stabiliser tube and is connected with this voltage port simultaneously, the negative electrode of the first voltage-stabiliser tube connects the positive terminal of fan and one end of the first electric capacity, the other end of the first electric capacity and the negative pole end ground connection of fan
Wherein, when the pwm signal that MCU produces is low level, field effect transistor ends, the supply voltage of this power interface access exports the anode of the first voltage-stabiliser tube to and controls this first voltage-stabiliser tube conducting, and the supply voltage of this power interface access is powered to fan by this first voltage-stabiliser tube, makes fan turns, simultaneously, to the first capacitor charging, along with the increase in the duration of charge of the first electric capacity, the operating voltage of fan is raised, thus control the rotating speed of fan.
2. fan drive circuit as claimed in claim 1, is characterized in that, when pwm signal is high level, field effect transistor conducting, thus the anode of this first voltage-stabiliser tube is by the field effect transistor ground connection of this conducting, the corresponding cut-off of the first voltage-stabiliser tube, stop powering to fan, make stopping fan rotation.
3. fan drive circuit as claimed in claim 2, it is characterized in that, described fan drive circuit also comprises a diode and one second voltage-stabiliser tube, the anode of diode connects the negative electrode of described first voltage-stabiliser tube, negative electrode connects the negative electrode of the second voltage-stabiliser tube, the plus earth of the second voltage-stabiliser tube, and diode and the second voltage-stabiliser tube have the effect of two-way stop, when first electric capacity is powered to fan when pwm signal is low level, voltage stabilizing is carried out to the voltage that this first electric capacity exports.
4. fan drive circuit as claimed in claim 2, it is characterized in that, described fan drive circuit also comprises one second electric capacity, and one end connects voltage port, the other end ground connection, carries out filtering for the supply voltage that voltage port accessed and electric current.
5. fan drive circuit as claimed in claim 1, it is characterized in that, the model of described fan is CN703.
6. an electronic equipment, comprise a power supply, a fan drive circuit and a fan, this fan drive circuit is for controlling rotation and the rotating speed of a fan, comprise a micro-control unit MCU and a power interface, this MCU has the pwm signal of fixed duty cycle for generation of one, this power interface, for accessing supply voltage, is characterized in that:
This fan drive circuit also comprises one first resistance, a field effect transistor, one first voltage-stabiliser tube and one first electric capacity, the grid of field effect transistor connects MCU, simultaneously also by the first resistance eutral grounding, the source ground of field effect transistor, drain electrode is connected with the anode of the first voltage-stabiliser tube and is connected with this voltage port simultaneously, the negative electrode of the first voltage-stabiliser tube connects the positive terminal of fan and one end of the first electric capacity, the other end of the first electric capacity and the negative pole end ground connection of fan
Wherein, when the pwm signal that MCU produces is low level, field effect transistor ends, the supply voltage of this power interface access exports the anode of the first voltage-stabiliser tube to and controls this first voltage-stabiliser tube conducting, and the supply voltage of this power interface access is powered to fan by this first voltage-stabiliser tube, makes fan turns, simultaneously, to the first capacitor charging, along with the increase in the duration of charge of the first electric capacity, the operating voltage of fan is raised, thus control the rotating speed of fan.
7. electronic equipment as claimed in claim 6, is characterized in that, when pwm signal is high level, field effect transistor conducting, thus the anode of this first voltage-stabiliser tube is by the field effect transistor ground connection of this conducting, the corresponding cut-off of the first voltage-stabiliser tube, stop powering to fan, make stopping fan rotation.
8. electronic equipment as claimed in claim 7, it is characterized in that, described fan drive circuit also comprises a diode and one second voltage-stabiliser tube, the anode of diode connects the negative electrode of described first voltage-stabiliser tube, negative electrode connects the negative electrode of the second voltage-stabiliser tube, the plus earth of the second voltage-stabiliser tube, and diode and the second voltage-stabiliser tube have the effect of two-way stop, when first electric capacity is powered to fan when pwm signal is low level, voltage stabilizing is carried out to the voltage that this first electric capacity exports.
9. electronic equipment as claimed in claim 7, it is characterized in that, described fan drive circuit also comprises one second electric capacity, and one end connects voltage port, the other end ground connection, carries out filtering for the supply voltage that voltage port accessed and electric current.
10. electronic equipment as claimed in claim 6, it is characterized in that, the model of described fan is CN703.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310420177.2A CN104454603A (en) | 2013-09-16 | 2013-09-16 | Electronic device and fan driving circuit thereof |
| TW102134393A TW201513557A (en) | 2013-09-16 | 2013-09-24 | Electronic device and fan driving circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310420177.2A CN104454603A (en) | 2013-09-16 | 2013-09-16 | Electronic device and fan driving circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104454603A true CN104454603A (en) | 2015-03-25 |
Family
ID=52901188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310420177.2A Pending CN104454603A (en) | 2013-09-16 | 2013-09-16 | Electronic device and fan driving circuit thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104454603A (en) |
| TW (1) | TW201513557A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336122A (en) * | 2020-03-25 | 2020-06-26 | 深圳市威诺华照明电器有限公司 | Fan with cooling device |
| CN111624912A (en) * | 2020-05-22 | 2020-09-04 | 广州裕芯电子科技有限公司 | Portable fan control chip, circuit and method |
-
2013
- 2013-09-16 CN CN201310420177.2A patent/CN104454603A/en active Pending
- 2013-09-24 TW TW102134393A patent/TW201513557A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336122A (en) * | 2020-03-25 | 2020-06-26 | 深圳市威诺华照明电器有限公司 | Fan with cooling device |
| CN111624912A (en) * | 2020-05-22 | 2020-09-04 | 广州裕芯电子科技有限公司 | Portable fan control chip, circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201513557A (en) | 2015-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150325 |
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| WD01 | Invention patent application deemed withdrawn after publication |