Whether the ultra-thin cooling fan can adjust the speed.clip fan Processing

　　Nowadays, ultra-thin cooling fans are used in many fields. Ultra-thin cooling fans can achieve the functions of dust removal and heat dissipation to prolong the service life of equipment. For the selection of ultra-thin cooling fans, some customers will first involve the use environment of the micro fans. If the ambient temperature is low and does not require cooling, the fan should not work, or the fan speed should be slower. This can not only achieve the purpose of heat dissipation, but also reduce power consumption. So can the ultra-thin cooling fan adjust the speed? Next, let's introduce it in detail.

　　1. Ordinary ultra-thin cooling fans, if they are not designed with special treatment, the fan cannot adjust the temperature according to the ambient temperature, because the motor of the ultra-thin cooling fan is fixed, as long as the voltage remains unchanged, the power of the fan is high and the fan How much is the speed.

　　2. If the voltage of the ultra-thin cooling fan changes, the power of the fan can be changed, which will also affect the speed of the cooling fan. However, the voltage of the cooling fan cannot be changed arbitrarily, and can only be adjusted downward, because if the voltage is too high, the current of the cooling fan will be too large, the current of the driver IC will be too large, and the temperature will rise and the cooling fan will be burned out.

　　3. A temperature control resistor is connected in series inside the motor of the ultra-thin cooling fan. When the temperature changes to increase or decrease, the temperature control resistance will also change, so that the resistance value of the micro fan motor connected in series changes, so that the ultra-thin fan motor will change. The rotation speed of the thin cooling fan has changed.

　　4. Ultra-thin cooling fans with PWM function, when the ambient temperature changes, the motherboard with PWM grounding will be affected by the temperature. By sending information to the fan to change the PWM duty cycle, the micro fan will follow the duty cycle. The size of the ratio, the rotational speed changes linearly.

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