Hello everyone, I want to talk about a theoretical subject. In low side current sense, how can you put the low side current into the clark transformer as positive or negative. I could not understand this situation. Are there bidirectional opamps here? Because since it is under the low mosfets, all kinds of negative values should flow. Is this how it happens? Or is there a special situation for negative or positive? Or as forward current or reverse current. I wanted to ask because this situation confuses me a lot, good day.
yes negative currents! Ia+Ib+Ic=0 . measure with OPV. offen zero is 1.65V. if it is below 1.65V it is negative current.
in line currents and low side is same: sum is null.
watch out for in line current measurements the voltage can be high!
Thanks for answer. I have a custom board that has an opamp called MC33174D and is connected as an inverting circuit. Will this opamp and inverting circuit cause any problems? Is it necessary to connect it differentially?
Another thing came to my mind. Can’t we drive inline at high voltage? Could this be a problem?
the wire can have a high voltage… your motor voltage! …
some opamps dont like it. opamps at the low side see 0V or a little more, not a problem for opamps.
in line current measure is better if you want do observer on current.
but low side is more common.
Thank you very much for reply. I will use TSC2012 bidirectional opamp. I think I havent problem with this opamp. Again thank you very much.