High bandwidth current sensor with a low insertion inductance based on the HOKA principle

This paper presents a broad bandwidth (DC to ∼50MHz) current sensor. It is inserted in the current conducting path and it has a low insertion inductance of about 1 nH due to a coaxial housing. The measurement procedure is based on HOKA principle using TMR sensors for the low frequency capture and a Rogowski coil for the high frequency capture. The HOKA principle combines both by analog signal processing.