Implementation and Performance of a Current Sensor for a Laminated Bus Bar

This paper proposes a current sensor embedded in a laminated bus bar. The proposed sensor is based on the Rogowski coil principle; the sensor can detect the magnetic flux corresponding to a derivative waveform of the current in a laminated bus bar. The electrical stray elements of the sensor depend on its geometry. The magnetic flux generated by the bus bar depends on the current repartition which is a function of the equivalent frequency during current transients. Both phenomena are discussed using partial element equivalent circuit-based software. Thanks to these investigations, the sensor is designed to measure switching waveforms. It is confirmed that the verification of the proposed current sensor embedded in a laminated bus bar can perform the measurement of a switching waveform using a buck converter circuit rated at 50 V and 8 A.