JAJU879 November 2022
The single shunt current sensing technique measures the dc-link bus current and, with knowledge of the power FET switching states, reconstructs the three phase current of the motor. The detailed description of the single shunt technique is described in the application note Sensorless-FOC for PMSM With Single DC-Link Shunt.
On this reference board, to implement single shunt current sensing technique by having a separate shunt resistor and amplifier circuit as shown in Figure 2-19.
The transfer function of this current sampling circuit and the calculation for single shunt are the same as the three shunt.