Zero crossing detection

Krishna36 · ‎2024-05-29

HELLO,

Can you please suggest us any mcu having internal block for zero crossing detection in stm32 for 50 - 60hz frequency signals or any slave chips that are dedicated for zero crossing detection.

Thank you,

Krishna.

Peter BENSCH · ‎2024-05-29

Welcome @Krishna36, to the community!

This is a recurring question for which you will find several entries here in the community, e.g. this one.

Hope that helps?

Regards
/Peter

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Uwe Bonnes · ‎2024-05-29

How large is your 50 Hz? What is your timing requirement?

Probably you can use a STM32 with comparator and use the 50 Hz offset to about half the supply voltage compared to half the supply voltage. I would use an external comparator with common mode input to some - 100 mV put a fitting resistor in the 50 Hz line, clip the voltage with two antiparallel schottky diode and compare against ground.