[Phase Dimmer Control using Triac]

Hello Sir/Madam,

 

I am engineering student making phase dimmer control using triac

The schematic is as attached

What I have observed that many times attached circuit stop working due to failure of triac

I am not sure is it because of di/dt or dv/dt failure. In order to avoid this I have used triac of much higher rating (10A) even though current needed can be as low as 1A.

However the problem continues.

 

I have observed that the failure is for transformer powered halogen lamp (inductive load?) and for ceiling fans.

It works satisfactorily for incandescent lamps.

 

Also I am sharing one more observation that if I connect glass tube fuse link in series with the load then the fuse blows.

From the various information available I realized that I need to use choke / inductor to overcome this problem. Is that right?

I need help to

    1. To find out the value of the inductor for 0.5A, 1A and 2A

    2. Is this a special type of inductor? if yeswish to know make

 

Thank you in advance

 

Dinesh

Phase_Dimmer_Schematic.pdf