Willen
Well-Known Member
Hi,
I prepared a dimmer for colorful lights which includes some transformerss colorful LED lamps and some (approx 100) colorful tungstan small bulbs (total wattage is around 80W). Thus I think the entire load is not 'inductive'. So I didn't add RC snubber to protect Triac in the dimmer. It would be compulsory if I used inductive loads instead. Look at the attached circuit.
Problem:
1) First I used 2N6073A (sensitive gate 4A, 400V) triac and it worked one night, but failed to another night. Failure: I am not being able to dim the lights, their brightness are full always. The damaged triac has unusual 'G to A1 short'.
2) Then I replaced with BT136 triac and it worked one night, but failed to another night again. Failure: I am not being able to dim the lights, their brightness are full always. The damaged triac has unusual 'A2 to A1 voltage drop of around 600mV' as diode.
What would be the reason of the frustrating problem? I used NTC, mains induction filter (T1) and X capacitor just for fun there. Do you think the T1 causing some inductive effect to destroy the triac again and again?
I prepared a dimmer for colorful lights which includes some transformerss colorful LED lamps and some (approx 100) colorful tungstan small bulbs (total wattage is around 80W). Thus I think the entire load is not 'inductive'. So I didn't add RC snubber to protect Triac in the dimmer. It would be compulsory if I used inductive loads instead. Look at the attached circuit.
Problem:
1) First I used 2N6073A (sensitive gate 4A, 400V) triac and it worked one night, but failed to another night. Failure: I am not being able to dim the lights, their brightness are full always. The damaged triac has unusual 'G to A1 short'.
2) Then I replaced with BT136 triac and it worked one night, but failed to another night again. Failure: I am not being able to dim the lights, their brightness are full always. The damaged triac has unusual 'A2 to A1 voltage drop of around 600mV' as diode.
What would be the reason of the frustrating problem? I used NTC, mains induction filter (T1) and X capacitor just for fun there. Do you think the T1 causing some inductive effect to destroy the triac again and again?