Re: Triac as gap replacement

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Richard W. by way of Terry Fritz <teslalist-at-qwest-dot-net>" <potluck-at-xmission-dot-com>

Hi Ken,
I've done a lot of cramming about triacs and SCRs lately. So much so that a
lot has seemed to run together. Anyway, as far as current capability the
back-to-back SCR is the way to go as far as I understand. There's something
about current lag in inductive circuits that won't allow a triac to turn off
or something like that. I would assume a capacitive load would be just as
bad. The word "commutate" comes to mind somewhere. With back-to-back SCRs
each SCR will always turn off every other cycle due to it's inherent
properties.

Maybe someone else here can clarify that for you.

Rick W.
Salt Lake City

----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, June 18, 2003 8:12 PM
Subject: Triac as gap replacement


 > Original poster: "K. C. Herrick by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <kchdlh-at-juno-dot-com>
 >
 > Have any of you looked into triacs having something like these
 > capabilities?
 >
 > Voltage withstanding, 600 V
 >
 > Current capability, sine-ac bursts of 3 KA peak declining over 10 cycles
 > to 10% in 100 us, and repeated -at- 120 bps.  In the circuit I'm
 > contemplating, that seems to be about 20 A rms (which is the
 > charging-current into the primary capacitors; I figure, rms current in =
 > rms current out).
 >
 > If so, can you save me some looking?
 >
 > Ken Herrick
 >
 >
 >