AC zero cross detection?

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Article #6940

#6940

From: Kent Boortz
Date: Fri, 21 Aug 1992 22:21

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Hi,

I will interrupt a microcontroller at 220V AC zero crossing time to reset
an internal timer. Any ideas of a simple but reliable zero crossing detection
circuit? The triggering has to be isolated with a optocoupler. The 220V
will beside driving a halogen lamp be transformed down to 9V AC to drive
the processor etc. Could I detect the zero crossing point on the 9V side
or will there be a phase shift because of the induction in the transformer
and the load?

Any ideas?

Kent Boortz
boortz@sics.se
--
Kent Boortz
boortz@sics.se

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Message-ID: <1992Aug21.222100.15735@sics.se>

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!sunic!sics.se!sics.se!boortz
From: boortz@sics.se (Kent Boortz)
Subject: AC zero cross detection?
Message-ID: <1992Aug21.222100.15735@sics.se>
Sender: news@sics.se
Organization: Swedish Institute of Computer Science, Kista
Distribution: sci
Date: Fri, 21 Aug 1992 22:21:00 GMT
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