| 摘要 |
PROBLEM TO BE SOLVED: To provide a current detector for a Rogowskii coil that has a simple configuration and can widen the band.SOLUTION: A current detector includes: a Rogowskii coil; a first integration circuit formed of passive elements for integrating an output signal of the Rogowskii coil; a second integration circuit that is connected to an output terminal of the first integration circuit, integrates an output signal of the first integration circuit, and is formed of an active circuit including an operational amplifier; and an operational circuit that adds the output signal Vof the first integration circuit to an output signal Vof the second integration circuit at a constant ratio G(=V/V) and outputs the addition result. A time constant T1 of the first integration circuit, a time constant T2 of the second integration circuit, and the addition ratio G of the operational circuit are set to have a relation of T1=T2×G. |
