pwm outputs

Thread Starter

davejay

Joined Mar 11, 2010
1
hi have a k8055 interface board and i want to use the pwm output (5v) to control the speed of a 240v AC fan, i can't seem to find a way of converting one signal to the other
 

aboamal

Joined May 29, 2008
14
pwm outputs can be used to control DC motors but for AC you can use firing angle technique as following



and the circuit will be like this



and for 3phase motors variable frequency drive used for controlling speed
 
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