Hey guys. Trying to put together a circuit to do the speed control of a single phase induction motor from a fan rated at 35 watts and runs at 220 / 240 V AC. The challenging part is that it needs to be done without the use of a micro controller. Basically there are 3 sub-systems namely: the switch-mode power supply, user-interface unit and the motor driver unit. I'm doing the motor driver unit which basically receives a 0 - 5V DC voltage signal from the user-interface unit and varies the speed of the motor according from 0 to its max speed. I'm inclined to using a triac and diac with possibly a zero-crossing IC (Optocoupler). I have come across a few circuits which make use of a triac/diac and potentiometer. I was thinking of implementing a circuit similar to these however, I will need to replace the pot with the reference voltage (in the range of 0 to 5v) from the user- interface unit. Any suggestions or circuit diagrams?
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