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I'm designing a flexible AC transmission system that utilises TSR.I'll need to use a voltage zero crossing and current zero crossing in my circuit to send to the microcontroller. I've being playing around with zero crossings in LTspice and I'm curious as to how I would design a current zero crossing and how I would simulate that in LTspice to measure the current. For the current zero crossing I will have a 230V load connected to a CT which is then run through to the zero crossing.

LTspice simulation of Voltage zero crossing

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  • \$\begingroup\$ Can you explain the relevance of the image please? \$\endgroup\$ Commented Sep 13, 2024 at 10:31

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A CT with a load resistor is a relatively low-impedance voltage source and you can feed it to a comparator, same as detecting a voltage zero-crossing.

If you need to simulate the CT itself, you just set up two inductors of specific inductances and set up the coupling between them with a SPICE directive. Simple, and there are plenty of tutorials online.

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