CN204961362U - Computer fan self -starting constant -current drive circuit - Google Patents
Computer fan self -starting constant -current drive circuit Download PDFInfo
- Publication number
- CN204961362U CN204961362U CN201520640585.3U CN201520640585U CN204961362U CN 204961362 U CN204961362 U CN 204961362U CN 201520640585 U CN201520640585 U CN 201520640585U CN 204961362 U CN204961362 U CN 204961362U
- Authority
- CN
- China
- Prior art keywords
- resistance
- fan
- amplifier
- triode
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a computer fan self -starting constant -current drive circuit, put U1 including fortune, resistance R1, electric capacity C1, triode Q, diode D1 and fan motor M, input PWM signal end is connected to resistance R1 one end, grounded capacitance C1 and resistance R2 are connected respectively to the resistance R1 other end, the resistance R2 other end is connecting resistance R3 respectively, U1 homophase end is put to electric capacity C2 and fortune, the electric capacity C2 other end connecting resistance R3 other end and ground connection, U1 inverting terminal connecting resistance R5 is put to fortune, triode Q projecting pole and ground resistance R6 are connected respectively to the resistance R5 other end, anodal and the resistance R4 of diode D1 is connected respectively to triode Q1 base. The utility model discloses add a DAC, the circuit becomes level and smooth analog signal to the PWM signal through total mark and bleeder circuit, recycles self -starting constant current linear drive circuit and comes the electric current of control through the CPU fan to the rotational speed of control fan, advantage such as have that the pick -up current is little, self -starting constant current linear drive, the miscellaneous signal of fan are little.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically a kind of computer fan self-starting constant-current drive circuit.
Background technique
Every in the dead of night time family PC fan noise just unusual sound, send ear-piercing sound sometimes, reason is that existing PC fan controls triode by the pwm signal Direct driver used mostly, though through the big capacity electrolyte capacitor filtering that fan is powered, but still there is objective ripple voltage, make fan can not stability of rotation, assorted signal be larger.And this circuit is in startup moment, has very large inrush current, very large impact can be caused to control triode.
Model utility content
The purpose of this utility model is to provide a kind of computer fan self-starting constant-current drive circuit, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technological scheme:
A kind of computer fan self-starting constant-current drive circuit, comprise amplifier U1, resistance R1, electric capacity C1, triode Q, diode D1 and fan electromotor M, described resistance R1 one end connects input pwm signal end, the resistance R1 the other end connects ground capacity C1 and resistance R2 respectively, the resistance R2 the other end is contact resistance R3 respectively, electric capacity C2 and amplifier U1 in-phase end, the electric capacity C2 the other end contact resistance R3 the other end ground connection, amplifier U1 end of oppisite phase contact resistance R5, the resistance R5 the other end is connecting triode Q emitter and earth resistance R6 respectively, triode Q1 base stage connects diode D1 positive pole and resistance R4 respectively, the resistance R4 the other end connects amplifier U1 output terminal, described diode D1 negative pole is connecting triode Q collector electrode and fan electromotor M respectively, the fan electromotor M the other end connects ground capacity C3 respectively, power supply VCC and amplifier U1 power end.
As further program of the utility model: described amplifier U1 model is LM324.
As the utility model further scheme: described power supply VCC voltage is 12V.
Compared with prior art, the beneficial effects of the utility model are: the utility model adds a DAC, circuit, pwm signal is become level and smooth analogue signal by anomalous integral bleeder circuit, recycling self-starting constant current linear drive circuit controls the electric current by cpu fan, thus control the rotating speed of fan, the advantages such as signal is little that have that inrush current is little, self-starting constant current Linear Driving, fan are mixed.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of computer fan self-starting constant-current drive circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technological scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of computer fan self-starting constant-current drive circuit, comprise amplifier U1, resistance R1, electric capacity C1, triode Q, diode D1 and fan electromotor M, resistance R1 one end connects input pwm signal end, the resistance R1 the other end connects ground capacity C1 and resistance R2 respectively, the resistance R2 the other end is contact resistance R3 respectively, electric capacity C2 and amplifier U1 in-phase end, the electric capacity C2 the other end contact resistance R3 the other end ground connection, amplifier U1 end of oppisite phase contact resistance R5, the resistance R5 the other end is connecting triode Q emitter and earth resistance R6 respectively, triode Q1 base stage connects diode D1 positive pole and resistance R4 respectively, the resistance R4 the other end connects amplifier U1 output terminal, diode D1 negative pole is connecting triode Q collector electrode and fan electromotor M respectively, the fan electromotor M the other end connects ground capacity C3 respectively, power supply VCC and amplifier U1 power end.
Amplifier U1 model is LM324.
Power supply VCC voltage is 12V.
Working principle of the present utility model is: refer to Fig. 1, DAC-circuit is made up of R1, C1, R2 and R3, wherein R1 and C1 forms D/A converter, it is level and smooth analogue signal by the pwm signal of input by integrating conversion, R2 and R3 forms bleeder circuit, according to different fan electromotor M specifications, the resistance of R2 and R3 can be adjusted to select suitable voltage.
Self-starting constant current linear drive circuit is made up of amplifier U1, triode, R4, R5 and D1, wherein the effect of R4 is current limliting, D1 is used to the electric current of control flow check passing through fan motor M, if the dutycycle of PWM is 0, the output voltage of amplifier U1 is very low, now different starting resistors can be set by D1, adjust the minimum operating voltage of fan electromotor M and minimum speed, Here it is auto-startup characteristic.When we increase the dutycycle of PWM, the output voltage of amplifier U1 becomes large gradually, and being equivalent to base current increases, and triode Q collector current increases, fan electromotor M faster rotational speed, therefore can adjust the rotating speed of fan electromotor M by the dutycycle changing PWM.The effect of R5 forms current parallel reverse feedback, when the electric current by fan electromotor M increases, the end of oppisite phase voltage of amplifier U1 raises, the output end voltage of amplifier U1 reduces, therefore can be reduced again by the electric current of triode Q, form a Current Negative Three-Point Capacitance, in-phase end and the end of oppisite phase of amplifier U1 play impedence matching.
Self-starting is used to stop powered on moment power supply to input excessive electric current; because this electric current can cause very large impact to control triode; in circuit; this protective function has mainly been come by C2; at powered on moment; the in-phase end of amplifier U1 is due to the existence of the C2 of electric capacity; charging is started to C2; in-phase end voltage rises from 0; before in-phase end voltage rise to end of oppisite phase voltage; the output end voltage of amplifier U1 is very low, and triode Q allows the electric current that passes through very little, thus plays a protective role.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any reference character in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to mode of execution, but not each mode of execution only comprises an independently technological scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technological scheme in each embodiment also through appropriately combined, can form other mode of executions that it will be appreciated by those skilled in the art that.
Claims (3)
1. a computer fan self-starting constant-current drive circuit, comprise amplifier U1, resistance R1, electric capacity C1, triode Q, diode D1 and fan electromotor M, it is characterized in that, described resistance R1 one end connects input pwm signal end, the resistance R1 the other end connects ground capacity C1 and resistance R2 respectively, the resistance R2 the other end is contact resistance R3 respectively, electric capacity C2 and amplifier U1 in-phase end, the electric capacity C2 the other end contact resistance R3 the other end ground connection, amplifier U1 end of oppisite phase contact resistance R5, the resistance R5 the other end is connecting triode Q emitter and earth resistance R6 respectively, triode Q1 base stage connects diode D1 positive pole and resistance R4 respectively, the resistance R4 the other end connects amplifier U1 output terminal, described diode D1 negative pole is connecting triode Q collector electrode and fan electromotor M respectively, the fan electromotor M the other end connects ground capacity C3 respectively, power supply VCC and amplifier U1 power end.
2. computer fan self-starting constant-current drive circuit according to claim 1, is characterized in that, described amplifier U1 model is LM324.
3. computer fan self-starting constant-current drive circuit according to claim 1, is characterized in that, described power supply VCC voltage is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520640585.3U CN204961362U (en) | 2015-08-24 | 2015-08-24 | Computer fan self -starting constant -current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520640585.3U CN204961362U (en) | 2015-08-24 | 2015-08-24 | Computer fan self -starting constant -current drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204961362U true CN204961362U (en) | 2016-01-13 |
Family
ID=55056432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520640585.3U Expired - Fee Related CN204961362U (en) | 2015-08-24 | 2015-08-24 | Computer fan self -starting constant -current drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204961362U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106817825A (en) * | 2016-12-22 | 2017-06-09 | 济南中维世纪科技有限公司 | A kind of video monitoring intelligent Light-control System and method |
| CN107147853A (en) * | 2017-04-28 | 2017-09-08 | 济南中维世纪科技有限公司 | A kind of video monitoring intelligent infrared regulating system and method |
| CN110985428A (en) * | 2019-12-14 | 2020-04-10 | 珠海格力电器股份有限公司 | Cooling fan drive circuit and cooking utensil |
-
2015
- 2015-08-24 CN CN201520640585.3U patent/CN204961362U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106817825A (en) * | 2016-12-22 | 2017-06-09 | 济南中维世纪科技有限公司 | A kind of video monitoring intelligent Light-control System and method |
| CN107147853A (en) * | 2017-04-28 | 2017-09-08 | 济南中维世纪科技有限公司 | A kind of video monitoring intelligent infrared regulating system and method |
| CN110985428A (en) * | 2019-12-14 | 2020-04-10 | 珠海格力电器股份有限公司 | Cooling fan drive circuit and cooking utensil |
| CN110985428B (en) * | 2019-12-14 | 2020-12-01 | 珠海格力电器股份有限公司 | Cooling fan drive circuit and cooking utensil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204961362U (en) | Computer fan self -starting constant -current drive circuit | |
| CN100446402C (en) | Circuit for starting DC fan | |
| CN102129260B (en) | Fan driving circuit | |
| CN101222196A (en) | Fan driving circuit | |
| CN201937530U (en) | Anti-reverse-rotation circuit of speed regulation feedback control of direct-current motor | |
| CN203675019U (en) | Drive circuit of brushless motor | |
| CN204334394U (en) | Direct current motor drive circuit | |
| CN201433925Y (en) | Fan speed control circuit | |
| TWI436582B (en) | Motor driving circuit and method thereof | |
| CN206468568U (en) | Rotation speed of the fan temperature-control circuit | |
| CN205141990U (en) | Soft start power controller | |
| CN103780226B (en) | The flexible controlled energy saving driving circuit of a kind of duty ratio | |
| CN204633657U (en) | A kind of DC motor speed-regulating circuit | |
| CN205407645U (en) | Direct current motor driver | |
| CN207218654U (en) | A kind of persistence level turns impulse circuit | |
| CN209016955U (en) | A kind of DC brushless motor positive and negative rotation circuit | |
| CN205533370U (en) | Heat pump controller of compatible multiple fan speed governing | |
| CN204835910U (en) | IGBT drive circuit | |
| CN205647316U (en) | High stability motor timing control ware | |
| CN206412631U (en) | A kind of drive circuit worked simultaneously about multiple lasers | |
| CN204836134U (en) | Isolated driving circuit | |
| CN111030653A (en) | PWM signal generating circuit and sawtooth wave signal generating circuit | |
| CN203883735U (en) | Drive circuit applied to electromotor | |
| CN205485672U (en) | Computer hardware temperature control device | |
| CN205130662U (en) | Printer control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160113 Termination date: 20160824 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |