Re: Triac as gap replacement

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

Original poster: "K. C. Herrick by way of Terry Fritz <teslalist-at-qwest-dot-net>" <kchdlh-at-juno-dot-com>

June (& all)-

Yes, that would do it...except: 1) the 2500 A/us di/dt remains a huge
problem and 2) think of all the individual parts required as compared to
a simple spark gap.  Ugh!!  I'm fed up to the eyeballs with complex
electronics, having fought the same for upwards of 60 years.

Ken

On Thu, 19 Jun 2003 21:35:47 -0600 "Tesla list" <tesla-at-pupman-dot-com>
writes:
 > Original poster: "June Heidlebaugh by way of Terry Fritz
 > <teslalist-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>
 >
 > a solid state relay us just a diode bridge with a SCR shorting
 > across the DC
 > output points of the bridge. This would act as a AC with with no
 > problems
 > with inductive kick back

 > -        Robert  H---- Original Message -----
 > From: Tesla list <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Thursday, June 19, 2003 8:08 AM
 > Subject: Re: Triac as gap replacement
 >
 >
 >  > 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
 >  >  >
 >  >