Principle of temperature control cooling fan is: according to the increased fan around the heat so as to improve the speed of the fan itself, but also increase the air flow (exhaust volume). The use of thermistor temperature detection, the sensor is installed at the fan hub can be detected through the fan temperature. In this configuration, must be correctly installed fan, when the fan after the installation is complete, the thermistor sensors can be connected line induced by special.

Fan is changed with the heat condition, running at a slower speed, fan will produce less noise, and less energy consumption. In most of the requirements for design, air temperature in fan speed running hours after the design temperature is usually low maximum ratio. Under usually cooling fan speed, can be enough to complete its work.

We should also consider several factors in the selection and installation of heat radiating fan is:

First of all, the cooling fan must be able to provide adequate exhaust quantity (i.e. speed), hot air cooling device under high temperature in the heat, when the air temperature is low or the hot air flow less, it is to do the reverse of the work.

Secondly, when installing the sensor must choose the correct position, ensure that can be placed in the proper position. Try to make the sensor can be directly clamped to cooling of the surface. In operation, the fan temperature control, if the heating temperature is high, the regulator will feel faster, while at lower temperatures, at a low speed, in the higher and lower intermediate, fan speed is almost no change in temperature. Temperature changes slowly, when the fan, fan speed change is slow, don't suddenly change the fan speed and noise. Reaction time depends on the length of the heat sensor, its sensitivity.

Use of radiating fan: overhead power supply box using a large windmill fan can timely absorb the heat of the CPU, but will also make their own temperature; small fan power supply temperature will be lower, but also can avoid the box on the top of the flow dead zone. If the power supply is arranged under the chassis, a large windmill fan directly from outside the enclosure into the wind, the power supply will be very cool, is conducive to the stability of the power supply, the service life is prolonged, but dust will be larger; small fan power is not cool, but will not become a cleaner. Some people like to under large windmill power anti loaded, are interested can try. For the non fan power, in the case of positive pressure air duct, most of the heat will be discharged to the outside the enclosure; negative pressure air duct inside the case, most of the heat will be discharged into the chassis. And no fan power supply a large number of openings will cause some inconvenience to the chassis design of air duct, the need to pay particular attention to. The heat is industrial equipment must be products, including the now mobile phone also is same, the cooling effect is not good are especially easy to crash.