TIDUF28 November 2023
The 3-phase inverter output phase current is measured using a 1-mΩ shunt and an AMC1306M05 high-precision, reinforced isolated delta-sigma modulator with a ±50-mV linear input voltage range. This allows use of a smaller shunt and reduces the shunt losses by 80% compared to a 5-mΩ shunt as required for modulators with ±250-mV input voltage range. In this design, the AMC1306M05 provides a maximum input range of ±64 A and a linear input voltage range of ±50 A. Figure 3-6 shows the AMC1306M05 schematic.