CN220168203U - DC fan rotation speed regulating circuit - Google Patents
DC fan rotation speed regulating circuit Download PDFInfo
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- CN220168203U CN220168203U CN202321050388.7U CN202321050388U CN220168203U CN 220168203 U CN220168203 U CN 220168203U CN 202321050388 U CN202321050388 U CN 202321050388U CN 220168203 U CN220168203 U CN 220168203U
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- triode
- direct current
- resistor
- fan
- rotating speed
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 102100027284 Fanconi-associated nuclease 1 Human genes 0.000 description 2
- 101000914689 Homo sapiens Fanconi-associated nuclease 1 Proteins 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The utility model discloses a direct current fan rotating speed regulating circuit which comprises a power supply voltage, a direct current fan, a first triode, a second triode and a first voltage reducing resistor, wherein the power supply voltage is connected with one end of a direct current motor, the other end of the direct current motor is respectively connected with a collector of the first triode and a collector of the second triode through the first voltage reducing resistor, a control port of a singlechip is respectively connected with a base of the first triode and a base of the second triode, and an emitter electrode of the first triode and an emitter electrode of the second triode are respectively grounded. The beneficial effects of the utility model are as follows: different rotating speeds of the direct current fan are controlled through cooperation of the triode and the voltage dropping resistor, so that the direct current fan can be switched to work at rated rotating speed and speed reduction rotating speed, the problem that the air quantity of the fan is adjustable can be solved, the rotating speed can be adjusted without a PWM control chip in the fan, the material cost is greatly reduced, and software processing is simple and easy to realize.
Description
Technical Field
The utility model relates to a direct current fan rotating speed regulating circuit.
Background
At present, there are two main principles for controlling the operation of a direct current fan in the market: firstly, as shown in fig. 1, a rated power supply of a direct current fan is provided, under the scheme, the fan can only work at a fixed rotating speed, if the rotating speed of the fan is higher, the noise is larger, a low-speed mute mode can not be entered, different environments can not be matched, and the use experience of a user is poor; second, as shown in fig. 2, the direct current fan has a PWM speed regulating function, so the rotation speed of the fan is adjustable, but because the fan needs a PWM control chip, the output lead of the fan is at least more than three lines, the material cost is greatly increased, the single chip microcomputer also has a PWM function, and the processing on the software is relatively complicated.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a direct current fan rotating speed regulating circuit.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a direct current fan rotational speed regulating circuit, it includes power supply voltage, direct current fan, first triode, second triode and first dropping resistor, the one end of direct current motor is connected to power supply voltage, the collecting electrode of first triode is connected respectively to direct current motor's the other end and is connected the collecting electrode of second triode through first dropping resistor, the base of first triode and the base of second triode are connected respectively to the control port of singlechip, the projecting pole of first triode and the projecting pole of second triode are grounded respectively.
Preferably, the two ends of the direct current motor are connected with diodes in parallel.
Preferably, the first dropping resistor is an adjustable resistor.
Preferably, the first dropping resistor comprises a first resistor and a second resistor which are connected in parallel.
Preferably, the control port of the singlechip is connected with the base electrode of the first triode through the third resistor, and the control port of the singlechip is connected with the base electrode of the second triode through the fourth resistor.
Preferably, the DC motor further comprises a third triode and a second voltage dropping resistor, wherein the other end of the DC motor is further connected with a collector electrode of the third triode through the second voltage dropping resistor, a control port of the singlechip is further connected with a base electrode of the third triode, and an emitting electrode of the third triode is grounded.
The beneficial effects of the utility model are as follows: different rotating speeds of the direct current fan are controlled through cooperation of the triode and the voltage dropping resistor, so that the direct current fan can be switched to work at rated rotating speed and speed reduction rotating speed, the problem that the air quantity of the fan is adjustable can be solved, the rotating speed can be adjusted without a PWM control chip in the fan, the material cost is greatly reduced, and software processing is simple and easy to realize.
The utility model is described in further detail below with reference to the drawings and examples; however, the utility model is not limited to the embodiment.
Drawings
Fig. 1 is a circuit diagram of a first type of dc fan in the prior art.
Fig. 2 is a circuit diagram of a second type of dc fan in the prior art.
Fig. 3 is a circuit diagram of a dc fan speed adjustment circuit according to a preferred embodiment of the present utility model.
Detailed Description
Referring to fig. 3, a dc FAN rotation speed adjusting circuit of the present utility model includes a power supply voltage VCC, a dc FAN M, a first triode Q1, a second triode Q2, and a first dropping resistor, where the power supply voltage VCC is connected to one end of the dc motor M, the other end of the dc motor M is connected to a collector of the first triode Q1 and to a collector of the second triode Q2 through the first dropping resistor, control ports (denoted as FAN1 and FAN 2) of the single chip microcomputer are connected to a base of the first triode Q1 and a base of the second triode Q2, respectively, and an emitter electrode of the first triode Q1 and an emitter electrode of the second triode Q2 are grounded, respectively.
The two ends of the direct current motor M are connected with the diode D1 in parallel, so that the current at one end of the input power supply of the direct current fan is prevented from flowing to the first triode Q1, and meanwhile, when the direct current fan is closed, a release loop is provided for the induced electromotive force, and the effect of a protection circuit is achieved.
In this embodiment, the first voltage-reducing resistor includes a first resistor R3 and a second resistor R4 connected in parallel, where the first resistor R3 and the second resistor R4 play a role in reducing voltage, and by adjusting the resistance values of the resistors R3 and R4, the direct current fan M can be controlled to operate at different rotation speeds, so as to provide another power supply for the direct current fan M.
Preferably, a control port FAN1 of the singlechip is connected with a base electrode of the first triode Q1 through a third resistor R1, and a control port FAN2 of the singlechip is connected with a base electrode of the second triode Q2 through a fourth resistor R4.
The supply voltage may be 5V, 12V, 24V, etc.
In the embodiment, a resistor voltage reduction principle is adopted, two triodes (a first triode Q1 and a second triode Q2) are used for respectively controlling two rotating speeds of the direct current fan M, and when the first triode Q1 is conducted and the second triode Q2 is closed, the direct current fan M works at a rated rotating speed; when the first triode Q1 is closed and the second triode Q2 is conducted, the rotating speed of the direct current fan M can be reduced.
In other embodiments, the rotation speed gear selection of the direct current fan M may be increased by adding a triode and a second dropping resistor with a different resistance value from the first dropping resistor, and the specific circuit connection structure is as follows: the direct current motor is characterized by further comprising a third triode and a second voltage-reducing resistor, wherein the other end of the direct current motor is connected with a collector electrode of the third triode through the second voltage-reducing resistor, a control port of the singlechip is also connected with a base electrode of the third triode, and an emitter electrode of the third triode is grounded.
The rotation speed can be adjusted by setting the first dropping resistor as an adjustable resistor.
The above embodiment is only used for further illustrating a dc fan rotation speed adjusting circuit of the present utility model, but the present utility model is not limited to the embodiment, and any simple modification, equivalent variation and modification of the above embodiment according to the technical substance of the present utility model falls within the protection scope of the technical solution of the present utility model.
Claims (6)
1. A DC fan rotating speed regulating circuit is characterized in that: the power supply voltage is connected with one end of a direct current motor, the other end of the direct current motor is respectively connected with a collector of the first triode and a collector of the second triode through the first buck resistor, a control port of the singlechip is respectively connected with a base of the first triode and a base of the second triode, and an emitter electrode of the first triode and an emitter electrode of the second triode are respectively grounded.
2. The direct current fan rotational speed adjustment circuit of claim 1, wherein: diodes are connected in parallel at two ends of the direct current motor.
3. The direct current fan rotational speed adjustment circuit of claim 1, wherein: the first dropping resistor is an adjustable resistor.
4. The direct current fan rotational speed adjustment circuit of claim 1, wherein: the first dropping resistor comprises a first resistor and a second resistor which are connected in parallel.
5. The direct current fan rotational speed adjustment circuit of claim 1, wherein: the control port of the singlechip is connected with the base electrode of the first triode through a third resistor, and the control port of the singlechip is connected with the base electrode of the second triode through a fourth resistor.
6. The direct current fan rotational speed adjustment circuit of claim 1, wherein: the direct current motor is characterized by further comprising a third triode and a second voltage-reducing resistor, wherein the other end of the direct current motor is connected with a collector electrode of the third triode through the second voltage-reducing resistor, a control port of the singlechip is also connected with a base electrode of the third triode, and an emitter electrode of the third triode is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321050388.7U CN220168203U (en) | 2023-05-05 | 2023-05-05 | DC fan rotation speed regulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321050388.7U CN220168203U (en) | 2023-05-05 | 2023-05-05 | DC fan rotation speed regulating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220168203U true CN220168203U (en) | 2023-12-12 |
Family
ID=89053892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321050388.7U Active CN220168203U (en) | 2023-05-05 | 2023-05-05 | DC fan rotation speed regulating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220168203U (en) |
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2023
- 2023-05-05 CN CN202321050388.7U patent/CN220168203U/en active Active
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