The quietest way to remove heat is with passive components such as heat sinks and heat pipes. This heat needs to be removed quietly and efficiently. What these systems all have in common, besides significantly smaller-and still decreasing-size, is that the amount of heat they must dissipate does not decrease often it increases! In the notebook PC, much of the heat is generated by the processor in the projector, most of the heat is generated by the light source. Other examples of this trend include projection systems and set-top boxes.
Thin and “Lite,” notebook PCs have shrunk significantly, yet their processing power has been maintained or increased. Consequently, lots of electronic components are being shoehorned into very small form factors. The trend in electronics, particularly consumer electronics, is towards smaller products with enhanced combinations of features. This article will describe how and why this evolution has taken place and will suggest some useful approaches for the designer. However, in recent years, the technology of using these fans has evolved significantly. Compact electrical fans are cheap and have been used for cooling electronic equipment for more than half a century. Interest has been growing in integrated circuits for controlling the speed of cooling fans in personal computers and other electronic equipment. The third wire provides feedback on the actual RPM of the fan.Why and How to Control Fan Speed for Cooling Electronic Equipment Fans with 4 wires are controlled through pulse width modulation (PWM), in theory a more efficient way of controlling the fan speed. See Lm_sensors for generic details.įans with 2 or 3 wires may have voltage regulation: higher voltage (typically up to 12 Volt) results in higher rotation per minute (RPM). Specific hardware may have specific needs with respect to kernel configuration. Fans that allow their speed to be controlled.A motherboard capable of regulating fan speeds.A BIOS that allows users to control the fan speed.Higher temperatures cause more wear on the electronics, resulting in a shorter lifespan.Ĭontrolling fan speed is not supported on all computers.What if the program controlling the fans fails? The computer could overheat and parts could be destroyed.There are two risks when manually controlling fan speeds: It is generally considered more safe to have the BIOS or dedicated hardware control the fans.
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