Yes Ned, you have right. Now I'm sure it was a language problem. There are
some diferences using technical terminology in different countries. This
make me seriously thinking that probably is better to keep my mouth shut
on this list.
BTW, when I said DC I was thinking exactly only to rectified and filtered
DC. And of course a full or half rectified wave is also DC.
It's important we both understood the problem ( me only 25 years ago...) I
hope Nick too.
Sincerely yours, Vasile

On Thu, 2 Aug 2001, Ned Seith wrote:

> Sergi,
>
> Vasili's statement that "this will never hapened in DC" suggests that a
> triac would not turn off while conducting DC current. When the DC current
> of a half or full wave rectified DC signal diminishes below the holding
> current of the triac, the triac will shut off, if a gate signal is not
> present. The DC current of a half or full wave rectified DC signal is a
> proportional by product of the DC voltage. If the load was purely
> resistive, then the DC voltage and the DC current would reach zero at the
> same moment. However, as you have "correctly" indicated, if the load is
> inductive (or capacitive) there will be a phase shift between the DC
> voltage and DC current. However, the fact remains that a triac will turn
> off when conducting the DC current of a half or full wave rectified signal.
> When I attended school nearly 40 years ago, half wave and full wave
> rectified signals were referred to as "pulsed DC energy" and our fellow
> classmates were never referred to as "dear". How times have changed
>
> Sincerely,
> Ned Seith
> Nedtronics
> 59 3rd Street
> Gilroy, CA 95020
> (408) 842-0858
> .
> At 11:32 AM 8/2/01 +0200, you wrote:
> > > A triac will turn off or interrupt DC current, if the DC
> > > current is pulsed
> > > energy and decreases in amplitude to near zero volts. As an example, a
> > > triac will effectively control a half wave or full wave
> > > rectified DC signal.
> >
> >Dear, formally a 'DC PULSE' is an AC signal plus a DC bias. And Vasili
> >explains CLEAR the physics of a triac. Tiacs CUT-OFF in absence of current,
> >not where DC voltage nears zero (remember inductive loads).
> >
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