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DC FAN PWM speed role?
Date：2020/4/18 Views：1456 【BACK】
DC Fan this function is to use pulse width modulation signal to control the fan speed, pulse signal frequency range: 30hz-30khz. The high-level voltage of the pulse signal can be any voltage between 3 and 10V, and the low-level voltage of the pulse signal can be up to 0.4 v. The speed of the DC fan varies linearly with the duty cycle, and reaches the maximum speed when the percentage of the high level of the pulse signal reaches the maximum. Customers choose PPWM function after the fan will be equipped with CS-constant speed function, IR-impulse current protection, CL (current limit) function. The PWM will follow the additional identification bar code. For example, P 20802580c393 CS320: "P" means the input signal is PWM, "20" "80" means the most significant two duty cycle (that is, 20% , 80%) . The "2580" represents the two most significant RPM's (25% of full speed, full speed) . To sum up, "20802580" means that when the duty ratio of the input PWM signal is 20% , the speed of the DC fan is 1000RPM, and when the duty ratio of PWM signal is 80% , the speed is 3200RPM. The DC fan has a constant speed function. The internal cooling software controls the speed at 3200 RPM. "320" is the maximum speed of the fan divided by 10, from this value can be calculated after the software constant speed of the fan can actually get the maximum speed (320 * 10 = 3200 RPM) . The advantage of this is that 20% more power is reserved inside the coil when the DC fan is running freely, and 20% is automatically released when the DC fan is mounted inside the customer's device, cs function has better cooling effect than the fan without CS function. The above is the introduction of the DC Fan Dongxingyue PWM speed role, we can be customized according to the special requirements of customers, if you want to know more DC FAN knowledge can click:http://www.dxymotors.com
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