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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