24 volt dc fan pwm control

[Axher]

Hi,

I'm in the design process of a speed control for 3 24 volt dc fans with sensors input to a microcontroler. I'm using the pwm output of the microcontroler to control the 3 fans speed. I'm using a 24volt power supply for the fan using about 150 watt. My question is : Is there any reason I should use a different power supply for the microcontroler for protection if the power supply of the fans is already isolated from the line?

 

[itsmoked]

No different supply is needed. That will be fine. You will want a little filtering as the fans could generate some noise when being PWM'd.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com