From: Alan Pearce <kiwiantipodean@googlemail.com>
To: "piclist@mit.edu" <piclist@mit.edu>
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Date: Wed, 18 Aug 2021 15:00:29 -0700
Subject: Re: [EE] off the shelf TRIAC module?
Thread-Topic: [EE] off the shelf TRIAC module?
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On Wed, 18 Aug 2021 15:38:27 -0600
Dwayne Reid <dwayner@planet.eon.net> wrote:

> ...  You=20
> can also get PID modules that are intended for integral-cycle=20
> control, where you would use a SSR with zero-cross switching.
>=20
> So many possibilities!

I had dealings with such a controller a couple of years ago. It needed
to be set up so the minimum pulse width to the SSR was one half of the
sinewave period. But the controller was then intelligent enough to skip
cycles as you got to very low percentages of on time or needed to do
fancy things to get an accurate average percentage. We were using it
with heaters on a black body calibration unit that had significant mass
(as in about 40kg of aluminium) so the long time scales of skipped half
cycles were not a problem but we needed the fine percentage resolution
(the unit needed to be stable to millikelvin once at operating point).
--=20
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