Re: AC zero cross detection?

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Article #6960

#6960

From: Massoud Ajami
Date: Sat, 22 Aug 1992 16:13

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In article <1992Aug21.222100.15735@sics.se> boortz@sics.se (Kent Boortz) writes:

>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

You can use CA3059 runing in continuous mode cascaded with H11L series 
optoisolator. The CA3059 can be used in low voltage, but phase shift of 
the transformer is load dependent, if such shift exists, use another 
small transformer and you may not need to use optoisolator.

Peace and Prosperity!
  ---==< 110 >==---

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From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: AC zero cross detection?
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