DC Fan Speed Control PWM Signal Introduction
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28-02-2011, 04:44 PM

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.ppt   PWM.ppt (Size: 887.5 KB / Downloads: 127)
DC Fan Speed Control PWM Signal Introduction
1. Speed Control Fan Structure
1-1. Use ON/OFF contr

Easy design and control method
Price cheaper
Disadvantage :
I. Power Dissipation is a design issue.
II. Not use friendly.
2. What is PWM Signal ?
PWM(Pulse Width Modulation)
: It’s a fixed frequency and pulse modulated for fan speed control.
Whenever change the duty cycle, the fan speed will be changed by system requirement
 The Purpose are :
1. The power dissipation will be saving.
2. And the working time will be increasing if the battery could not be charged outside. (especially NB system)
3. PWM control Methods introduction
3-1Speed Control Fan Structure (old version

 Use ON/OFF control by Transistor
I. Easy design and control method
II. Price cheaper.
I. Poor Reliability ( Transistor are On/OFF continuously)
II. Error judgment of tachometer signal.

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