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need help with snubber

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aruna1

Member
hello gys,I,m working on a fan dimmer.i want to know how to design a snubber for the triac? problem is i have no details about fan motor.

and is there any way to omit snubber circuit?

thanks
 

bountyhunter

Well-Known Member
I am pretty sure the snubber is necessary to protect the TRIAC from voltage spikes. The manufacturer probably has guidelines on what to use for it, but I'll wager it depends on the nature of the load.
 

bountyhunter

Well-Known Member
That's what I was afraid of. You can't "dim" a ceiling fan like a light bulb. They use an AC induction motor, and the speeds are varied by using different value of the phasing capacitor that runs the motor. If you try to do a "dimmer" to vary speed the motor will overheat and eventually stall.
 

aruna1

Member
That's what I was afraid of. You can't "dim" a ceiling fan like a light bulb. They use an AC induction motor, and the speeds are varied by using different value of the phasing capacitor that runs the motor. If you try to do a "dimmer" to vary speed the motor will overheat and eventually stall.
actually its possible,i did it.currently I'm fine tuning timing of firing the triac.i needed a snubber to prevent triac from continoues turn on.

here is the circuit Aruna's Electronic Page

this contain complete instruction and code.but I'm doing some modification to code now and i will upload modified code once i finish it.:)
 
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