Shunt-based current sensor

A shunt-based current sensor configured to execute redundancy detection of a load current flowing through a load by using a shunt resistor, the shunt-based current sensor comprising:

• a reference resistor connected to the shunt resistor in series;
• a current excitation circuit configured to generate an AC excitation current and supply the AC excitation current to the shunt resistor and the reference resistor;
• at least two voltage measurement circuits configured to measure a voltage across the shunt resistor;
• and
• a signal processing circuit configured to execute signal processing based on respective measurement voltages of the at least two voltage measurement circuits, wherein
• the signal processing circuit is further configured to be operated in a load current redundancy detection mode or a shunt resistance measurement mode,
• the load current redundancy detection mode is a mode in which the redundancy detection of the load current is executed via measurement of the voltage across the shunt resistor by using the at least two voltage measurement circuits, on a condition that:
• the AC excitation current is not flowing to the reference resistor and the shunt resistor;
• and
• the load current is flowing from the load to the shunt resistor, and
• the shunt resistance measurement mode is a mode in which a resistance value of the shunt resistor is detected based on a voltage across the reference resistor and the voltage across the shunt resistor measured by the at least two voltage measurement circuits, respectively, on a condition that the AC excitation current is flowing from the current excitation circuit to the reference resistor and the shunt resistor.