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if the sensor current signal go above a high threshold (positive current) or go below a low threshold (negative current), the comparator output (all outputs are /ORed) trigger the /fault entry of the microcontroller, which instantaneously shut down the PWM signals.
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That's exactly what I do too. I also add some NAND flip-flops and a p-channel mosfet so that Vcc of all high side optocouplers goes to zero.