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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
It's impossible to say because it depends so much on what kind of SCRs you use, and what turnoff and snubbing circuitry, and how much losses you can tolerate. There is no single, neat answer, which is why Google won't tell you.
But I believe it could be done with (expensive) inverter grade SCRs. GTOs are faster yet. I heard they can compete with IGBTs below 25kHz, but they are even more expensive.
The regular types are only rated for 60Hz service, which doesn't mean that they won't work at 1kHz, it just means nobody knows if they work at 1kHz or not. :P
Registered Member #267
Joined: Mon Feb 27 2006, 09:44PM
Location:
Posts: 46
Yeah, it seems that their current-carrying capability decreases when the frequency increases. I found a datasheet that showed this.
I read that the turn-off time affects the maximum frequency. You obviously couldn't run a device with a 50 micro-second turn-off time at 20 kHz. I am wondering how close the turn-off time and the switching period can be to each other to get successful switching.
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SCR Question
