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Hi all,
I've been trying to design a circuit board which uses Atmel M90E26 to measure the power consumed by some load. I looked at the reference design from its application note but the current sampling circuits look extremely confusing to me. I don't understand how can one use the Live wire of AC mains as reference for the whole circuit. I do not want to put myself or anything at risk so, I've decided to use the current sampling circuit on the neutral line. Can I use a shunt instead of a current transformer on the N line current channel and completely eliminate the current sampling circuit on phase line? because i do not need the anti-tampering feature. This way the ground of the whole circuit will be Neutral line of the AC mains.
I've been trying to design a circuit board which uses Atmel M90E26 to measure the power consumed by some load. I looked at the reference design from its application note but the current sampling circuits look extremely confusing to me. I don't understand how can one use the Live wire of AC mains as reference for the whole circuit. I do not want to put myself or anything at risk so, I've decided to use the current sampling circuit on the neutral line. Can I use a shunt instead of a current transformer on the N line current channel and completely eliminate the current sampling circuit on phase line? because i do not need the anti-tampering feature. This way the ground of the whole circuit will be Neutral line of the AC mains.
