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The high temperature of the power components is a known phenomenon in electronics. To overcome this challenge, the designers mount heatsinks on the components to dissipate the heat, however, in many commercial and home appliance devices, the embedded heatsink is not adequate and the air must be circulated faster to reduce the heatsink and component temperature, otherwise, the lifetime of the component is reduced significantly.

The proposed automatic FAN controller board is simple, compact, and can be embedded inside commercial devices. The LM35 temperature sensor could be fixed on the heatsink using some silicon glue. 

The user can easily set the temperature threshold using a potentiometer. The board can be supplied using a 5V or a 12V supply, therefore a variety of 5V, 12V, miniature, and PC FANs can be used.

I used Altium Designer 21 and SamacSys component libraries (SamacSys Altium plugin) to draw the schematic and PCB. Except for the connectors, all components are SMD and easy to solder.

 

 

References

Source: https://www.pcbway.com/blog/technology/Cooling_FAN_Controller_using_an_LM35_8d3d76cb.html

[1]: LM358 datasheet: https://www.st.com/resource/en/datasheet/lm358.pdf

[2]: SI2302 datasheet: https://www.vishay.com/docs/63653/si2302dds.pdf

[3]: LM358 schematic symbol, pcb footprint, 3D model: https://componentsearchengine.com/part-view/LM358D/STMicroelectronics

[4]: Si2302 schematic symbol, pcb footprint, 3D model: https://componentsearchengine.com/part-view/SI2302DDS-T1-GE3/Vishay

[5]: Electronic designing CAD software plugins: https://www.samacsys.com/library-loader-help

[6]: Altium Designer plugin: https://www.samacsys.com/altium-designer-library-instructions

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