What happens when a thyristos fails?

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rich

Joined: 26 May 2004
Posts: 1

26 May 2004 22:10 thyristos

I am wanting to use a thyristor to switch a heating element but my concern is that if the thyristor fails, could it remain switched on? This would be detrimenal - any ideas on how to avoid this? Not too happy with results seen on a thermal trip switch - unreliable.

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bastos4321

Joined: 01 Jan 1970
Posts: 341
Helped: 24
Location: space

26 May 2004 23:36 Re: What happens when a thyristos fails?

rich wrote:

If the thyristor enters in short circuit, you can use a fuse, or a thermal switch to open the load when the temperature gets hot.

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tanuki

Joined: 11 Jun 2001
Posts: 100
Helped: 3
Location: Spain

27 May 2004 1:00 Re: What happens when a thyristos fails?

Most Common Thyristor Failure Mode

When a thyristor is electrically or physically abused and fails either
by degradation or a catastrophic means, it will short (full-wave or
half-wave) as its normal failure mode. Rarely does it fail open
circuit. The circuit designer should add line breaks, fuses, overtemperature
interrupters or whatever is necessary to protect the
end user and property if a shorted or partially shorted thyristor
offers a safety hazard.

http://www.eetchina.com/ARTICLES/2003MAY/PDF/2003MAY28_AMD_POW_AN03.PDF

sabari

Joined: 02 Oct 2004
Posts: 66
Helped: 1

22 Feb 2005 13:44 What happens when a thyristos fails?

When a thyristor is electrically or physically abused and fails either
by degradation means, it will short as its normal failure mode. Rarely does it fail open
circuit. The circuit designer should add line breaks, fuses, overtemperature
interrupters or whatever is necessary to protect the
end user and property if a shorted.