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3 Phase inverter, shunt resistor waveform

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fasset

Joined May 30, 2014
1
Hi.
I have one question about AN4076 "Two or three shunt resistor based current sensing circuit design in 3-phase inverters" STM Application Note.
On the page 6, 10 we can see signals on shunt resistor.
I my opinion current (and shunt resistor voltage) shouldn't have values below zero except some noises. Could anyone explain this?
 

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