Author Topic: Derating of solid state components  (Read 575 times)

Offline plasma

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Derating of solid state components
« on: December 08, 2020, 12:06:47 PM »
Hi I have been running a Scr that's rated for 1.6kV at 1kV ,I'm thinking of increasing that to 1.4kV.

I'm wondering if it could run at that increase everyday and the rest?
Would that increase put a lot more stress on the component if everything else stays the same?
What would be a good derating 1.3/1.4/1.5kV?

Thanks

Offline davekni

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Re: Derating of solid state components
« Reply #1 on: December 08, 2020, 08:09:00 PM »
The reason for voltage margin is mostly to handle any unexpected transients.  Presuming that charging voltage transients are minimal in your setup, 1.5kV is fine.  I've ran 600V-rated TRIACs at 800V after measuring that their actual breakdown voltage was about 1000V when driven by a few uA.

Have you checked peak current when using aluminum wire rather than just salt?  That may be your highest risk.
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Offline Mads Barnkob

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Re: Derating of solid state components
« Reply #2 on: December 08, 2020, 09:00:05 PM »
In a completely unknown inductance/application I would say its best practice to keep 33% head room (800VDC bus on 1200V devices)

I am not an expert on SCRs, but they handle over-current much better than voltage transients. Is this a hockey-puck SCR or what are talking about? Give us some more information or pictures :)
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Offline plasma

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Re: Derating of solid state components
« Reply #3 on: December 08, 2020, 09:27:25 PM »
Its this https://www.digikey.co.nz/product-detail/en/vishay-semiconductor-diodes-division/VS-70TPS16PBF/VS-70TPS16PBF-ND/2632107 it says about 880Apk but it says 64kA fusing?
Its more a general question, after davekni reply I'll use 8 10W 1ohm resistor.
The charging circuit with choke showed 580V on a 50% voltage divider, another 320V+ .
The caps I started with 3 in series, but they seem to be holding up at 2 in series.

Thanks

Offline davekni

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Re: Derating of solid state components
« Reply #4 on: December 08, 2020, 09:39:48 PM »
As long as load impedance is reasonable, TRIACS handle occasional over-voltage transients well.  I expect SCRs are the same, at least in the forward direction.  Most of our printers (I work for Xerox) use 600V rated TRIACs to control internal line-voltage heaters.  3kV line-surge testing turns on every TRIAC in a printer.  That's the result of a voltage surge.  The TRIAC turns itself on, which protects it as long as the load impedance is within reason.

BTW, look carefully at that 64kA spec. (61150 in the version I see).  It is 61150 amps * amps * sqrt(seconds).  For 10ms it will fry over 782 amps, as 782 * 782 * sqrt(0.01) = 61150.  For 100us it will fry over 2473 amps.
« Last Edit: December 08, 2020, 09:59:24 PM by davekni »
David Knierim

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Re: Derating of solid state components
« Reply #4 on: December 08, 2020, 09:39:48 PM »

 


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