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Talking about the cooling function of DC cooling fan

2021-11-11 07:57:09
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At present, there are two monitoring methods for the fan itself: alarm sensor and speed sensor. Using an alarm sensor, when the fan speed is lower than a certain threshold, an alarm signal can be issued, and the output of the speed signal can realize real-time monitoring of the fan speed. Obviously, the larger the air volume, the higher the cooling capacity of the cooling fan . This is because the heat capacity ratio of the air is constant, and a larger air volume, that is, more air per unit time, can take away more heat. Of course, in the case of the same air volume, the heat dissipation effect is related to the flow of the wind.

The alarm signal output by the fan circuit has two states: "high level" and "low level". The meanings represented by these two levels generally conform to the positive logic system. High level means "fault" and "low level" means "normal".

Special cooling fan for purifier

The speed signal output by the fan circuit is usually in the form of pulses, and each wave head indicates that the fan rotates one circle. Such signals can be directly provided to the host through the data bus for display. The speed signal output by some fans is not the real speed of the fan, but a multiple of the speed. For example, 2, 4, or 6 pulses are generated per revolution, which must be processed to form a signal that reflects the true speed of the fan. To tell if the fan speed is the actual speed or a multiple, use the tachometer to measure the actual speed and compare it to the displayed data.

The speed measurement signal of the fan is generally output by a three-lead plug. The yellow and black of the three leads are +12V power and ground respectively, and the other color line is the speed signal output line. It should be noted that the third wire of some three-conductor fans is not a speed measurement signal output wire, but a speed regulation signal wire, through which the speed regulation signal is input to the fan motor.


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