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3 Phase inverter, shunt resistor waveform

Question asked by fasset.fasset on Oct 11, 2015
Latest reply on Oct 13, 2015 by Gigi
I have one question about AN4076 "Two or three shunt resistor based current sensing circuit design in 3-phase inverters".
On the page 6, 10 we can see signals on shunt resistor. How it is possible it's bipolar?
I my opinion current (and shunt resistor voltage) shouldn't have values below zero except some noises. Could anyone explain this?