CN215908101U - Control system of miniature constant speed fan - Google Patents
Control system of miniature constant speed fan Download PDFInfo
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- CN215908101U CN215908101U CN202122388135.8U CN202122388135U CN215908101U CN 215908101 U CN215908101 U CN 215908101U CN 202122388135 U CN202122388135 U CN 202122388135U CN 215908101 U CN215908101 U CN 215908101U
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- fan
- rotating speed
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- control
- control system
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Abstract
The utility model discloses a control system of a miniature constant-speed fan, which comprises a fan drive IC and a singlechip control IC connected with the fan drive IC. The fan drive IC enables the fan to normally operate, a rotating speed detection FG signal is generated after the fan operates, the rotating speed of the fan can be monitored at any time, the rotating speed of the fan is transmitted to the single chip microcomputer control IC, the single chip microcomputer control IC converts the rotating speed detection FG signal into a relative PWM Duty through an internal program after receiving the rotating speed detection FG signal, the relative PWM Duty is output to a PWM rotating speed control port of the fan drive IC through an IO port, and a closed loop is formed through signal feedback and transmission output at any time to achieve the constant rotating speed of the fan, and the use requirement of a special terminal product is met.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a micro fan.
Background
Some terminal products require high precision of the rotation speed of the micro fan, according to the prior art, the precision of the rotation speed of the micro fan cannot meet the requirement, and the product can cause errors when being applied due to insufficient precision of the rotation speed of the micro fan when being applied, so that the requirement of a customer cannot be met.
SUMMERY OF THE UTILITY MODEL
The technical problems solved by the utility model are as follows: the rotational speed precision of the miniature fan in the prior art is poor.
In order to solve the technical problems, the utility model provides the following technical scheme: a control system of a miniature constant-speed fan comprises a fan drive IC and a single chip microcomputer control IC connected with the fan drive IC, wherein the single chip microcomputer control IC receives FG signals from the fan drive IC and provides PWM signals for the fan drive IC.
The fan drive IC enables the fan to normally operate, a rotating speed detection FG signal is generated after the fan operates, the rotating speed of the fan can be monitored at any time, the rotating speed of the fan is transmitted to the single chip microcomputer control IC, the single chip microcomputer control IC converts the rotating speed detection FG signal into a relative PWM Duty through an internal program after receiving the rotating speed detection FG signal, the relative PWM Duty is output to a PWM rotating speed control port of the fan drive IC through an IO port, and the constant rotating speed of the fan is achieved through the feedback and transmission output of the signals at any time.
The utility model solves the problem of the precision of the rotation speed control of the micro fan and the interference influence of external environmental factors on the micro fan. No matter the temperature and the voltage change, the rotating speed of the fan is not influenced, and the use requirement of special end products is met.
Drawings
The utility model is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a control system for a miniature constant speed fan;
fig. 2 is a control timing diagram of a control system of a micro constant speed fan.
Detailed Description
Referring to fig. 1, the control system of a miniature constant speed fan comprises a fan driving integrated circuit U1 and a single chip microcomputer control integrated circuit U2 connected with the fan driving integrated circuit, wherein the single chip microcomputer control integrated circuit receives FG signals from the fan driving integrated circuit and provides PWM signals to the fan driving integrated circuit.
As shown in fig. 1, the diode D1 plays a role in polarity protection to prevent the reverse connection of the lead when in use, and the chip capacitor C1 is a power supply bypass capacitor to prevent interference and ensure the normal operation of the fan driving integrated circuit and the single chip microcomputer control integrated circuit. The chip resistor R1 is a pull-up resistor and provides stable signal feedback for the singlechip control integrated circuit U2.
Referring to fig. 1 and 2, the fan driver ic U1 ensures normal operation of the fan, and after the fan operates, the fan driver ic provides the FG signal for detecting the rotation speed, and stabilizes the FG signal for detecting the rotation speed through the chip resistor R1. The input IO port of the singlechip control integrated circuit U2 receives the rotation speed detection FG signal value, the rotation speed detection FG signal value is converted into corresponding PWM Duty through an internal program of the singlechip control integrated circuit, and the corresponding PWM Duty is output to the PWM control port of the fan drive integrated circuit U1 through the output IO port of the singlechip control integrated circuit. And the PWM control port of the fan driving integrated circuit receives the PWM Duty and immediately adjusts the rotating speed of the fan correspondingly. The operation of the fan can be ensured to be constant by circulating the steps.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description herein, since various changes and modifications can be made in the details of the embodiment and the application range according to the spirit of the present invention.
Claims (2)
1. A control system of a miniature constant-speed fan comprises a fan drive IC, and is characterized in that: the single chip microcomputer control IC receives FG signals from the fan drive IC and provides PWM signals to the fan drive IC.
2. The control system of a miniature constant speed fan of claim 1, wherein: the FG signal output end of the fan drive IC is connected with a pull-up resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122388135.8U CN215908101U (en) | 2021-09-30 | 2021-09-30 | Control system of miniature constant speed fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122388135.8U CN215908101U (en) | 2021-09-30 | 2021-09-30 | Control system of miniature constant speed fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215908101U true CN215908101U (en) | 2022-02-25 |
Family
ID=80311589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122388135.8U Active CN215908101U (en) | 2021-09-30 | 2021-09-30 | Control system of miniature constant speed fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215908101U (en) |
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2021
- 2021-09-30 CN CN202122388135.8U patent/CN215908101U/en active Active
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