Compared with other parts in the power supply, the life of the cooling fan is relatively short (usually the mean time between failures is about 5,000 to 100,000 hours); therefore, if you can change the way it operates, you can extend the life. Generally speaking, there are two types of fan control methods:
Temperature control: When the temperature switch detects that the internal temperature of the power supply exceeds its set value, the cooling fan will run at full speed; on the contrary, when it is lower than its set value, it will stop running or run at half speed. Speed operation. In addition, in some power supplies, the cooling fan is controlled by a nonlinear control method to control its speed to change synchronously with different internal temperatures.
Load control: When the load of the power supply exceeds its set value, the cooling fan will run at full speed; on the contrary, when it is lower than its set value, it will stop running or run at half speed.