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Time：2022-01-13Views：0
At present, miniature cooling fans are used on many platforms to extend the application life of the equipment through dust removal and heat dissipation. Some customers will consider the application environment of the micro fan when selecting the micro cooling fan. When the temperature is low and heat dissipation is not required, they hope that the fan will not work, probably because the fan rotates slowly. While achieving the heat dissipation target, it also reduces power loss. So can the micro cooling fan adjust the speed?
1. Ordinary micro cooling fans, if they are not specially designed, can not adjust the temperature according to the ambient temperature, because the motor of the micro cooling fans is fixed, as long as the voltage remains the same, the power of the fan and the speed of the fan .
2. If the voltage of the micro cooling fan changes, the power of the fan can be changed, and the speed of the cooling fan will also be affected. However, the voltage of the cooling fan cannot be changed randomly, and can only be adjusted downwards, because if the voltage is too high, the current of the cooling fan will be too large, the current of the driving integrated circuit will be too large, and the increase in temperature will cause the cooling fan to burn out.
3. Connect a temperature control resistor in series with the motor of the miniature cooling fan. When the temperature changes or decreases, the temperature control resistance will also change, so that the resistance value of the miniature fan motor connected in series will change, thereby changing the speed of the miniature cooling fan.
4. Micro cooling fan with PWM function. When the ambient temperature changes, the motherboard set by PWM will be affected by the temperature. By sending a message to the fan to change the duty cycle of PWM, the micro fan will follow the size of the duty cycle. , The speed changes linearly.
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