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TRIAC blown out - possible reasons of overheating

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nishantmb

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Hi,

I am using a BTA12800 CW TRIAC which is a snubberless TRIAC + snubber ckt.

TRIAC blown out and got short that too after some time,

Is there a possibility that snubber may cause overheating?

What else can be a possible reason?

Please help me with all the parameters I should check?

Let me know it any more input required
 

Hi

What type of load are using?


All the best

Bobi
 
Dear Bob,

Thanks for the reply I am driving a 150w single phase inductor motor.

Just to remind you there is a snubber accross the TRIAC (TRIAC is snubberless) for extra protection.

Is it possible that R+C snubber can short??
 

Hi

I have encountered the same phenomenon long time ago when there was no TRIAC with snubber and I have to use an external snubber.

I think the problem relay to connection of inductive load the TRIAC

Look at ST site for some application note regarding TRIAC design for inductive load

All the best

Bobi

The microcontroller specialist
 
I know I am asking for too much but could you please describe your senario.

So that we can corelate and probably come to some conclusion.

This can be a great help to community
 

Dear bobi,

I have already added R+C snubber to a snubberless TRIAC(BTA12800CW) can this senario cause any kind of overheating?

One more thaught the transient response of inductor is short ckt, so can frequent motor on and off can be the root cause?
if yes any way to replicate the senario

Regards
Nishant
 

The circuit is incomplete, but the direction control suggests, that you have a motor capacitor between both motor input nodes. Are you sure, that you can't activate both directions simultaneously during direction reversal? This would cause high peak currents, because the capacitors discharges through the triacs. I experienced welding of 10A power relay contacts in a similar circuit using mechanical relays. An explicite control deadtime (break before make) or a current limiting resistor in series with the capacitor can help.
 

Hi,

I didnt get your reply could you please be a bit more precise.

Thanks in advance

Regards
 

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