Implementation and performance of a current sensor for a laminated bus bar

This paper presents a current sensor embedded in a laminated bus bar. The proposed sensor is based on the Rogowski coil principle and it can detect the magnetic flux corresponding to a derivative waveform of the current within the bus bars. The frequency characteristics of the current sensor including the parasitic parameters depending on the circuit geometry are discussed. After the design of the current sensor using a PEEC-based software, the proposed sensor was implemented using four-layers and three PCBs. It is confirmed that the verification of the proposed current sensor embedded in the laminated bus bar can be performed by the measurement of turn-on and -off switching waveforms using a buck converter circuit, rated at 50 V and 4 A.

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