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Phase Dimmer Control using Triac

Discussion in 'Power Electronics' started by dinesh4761, Aug 29, 2019.

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  1. dinesh4761


    Aug 29, 2019
    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


    Attached Files:

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