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Why the PWM speed regulation cooling fan startup delay phenomenon

by:TOCH     2021-01-27
In recent years, due to the equipment, low noise and low power consumption demand is increasing, and PWM speed regulation cooling fan just meets the requirements of these two points, so the demand of the PWM speed regulation cooling fan has also been gradually rise;


speed regulation cooling fan speed control functions can fan speed by adjusting the duty ratio to linear control cooling fan speed, today we from a cooling fan by adjusting the duty ratio control fan speed to explain, inevitably we may encounter when using speed regulation cooling fan fan will have the phenomenon of delay start, after the power supply is the reason why will appear this kind of phenomenon?


PWM speed regulation cooling fan speed control in the 0% duty cycle, there are two modes:


mode: ( Cooling fan speed control in the 0% duty cycle when low speed running state)







mode 2: ( Cooling fan speed control in the 0% duty cycle, the phenomenon of the fan stalling)
















speed regulation cooling fan advantages and disadvantages of the two models are:


model a fan running at low speed condition:


advantage: no low duty cycle start slow speed regulating process. Weakness: cannot be compared by shutting down the fan.


disadvantages: cannot be compared by shutting down the fan


mode 2 fan stalling phenomenon:


advantage: use PWM can switch the fan


disadvantages: compared when the fan is set to 0 20%, start the influential


so if needed PWM control fan stalling lectotype 2, 0% duty cycle halt.


but when we use PWM speed regulation cooling fan meet startup delay because what reason, how do we avoid this situation? Next we do in detail;


chi auto focus a cooling fan field, to provide professional technical support, product collaborative design according to user needs, provide the overall cooling solutions.
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