| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost current sensor excellent in temperature characteristics.SOLUTION: A current sensor 100 comprises: a rectangular wave signal generation section 10a generating a rectangular wave signal oscillating between a positive voltage and a negative voltage that have the same absolute value; a toroidal coil 20 having an annular core 20A through which a conductor 20C for the flow of measurement target current I0 is inserted, and a lead wire 20B which is wound around the core 20A and through which current according to the rectangular wave signal flows; a resistor 30 arranged between an output terminal and a ground terminal of the toroidal coil 20; a pulse signal output part 40 which outputs a pulse signal over a predetermined second period within a first period from inversion of the rectangular wave signal to flux saturation of the core 20A, in a case where the measurement target current I0 does not flow through the conductor 20C and in a case where current based on the rectangular wave signal flows through the lead wire 20B; and a sample hold section 50 sample-holding a voltage between terminals of the resistor 30 on the basis of the pulse signal. |
