| 摘要 |
PROBLEM TO BE SOLVED: To provide a current sensor with high accuracy in which a difference in output sensitivity between a positive side and a negative side of a magnetoelectric transducer is corrected.SOLUTION: A current sensor comprises: an annular magnetic body core that has a gap provided to a part thereof; a magnetoelectric transducer that is arranged in the gap; an element drive circuit connected with an input terminal of the magnetoelectric transducer and a differential amplifier circuit connected with an output terminal of the magnetoelectric transducer; a positive-side signal amplifier circuit and a negative-side signal amplifier circuit connected in parallel with an output of the differential amplifier circuit; and an adder circuit that synthesizes outputs of the positive-side and negative-side signal amplifier circuits. A gain adjustment circuit is provided to at least one of the positive-side signal amplifier circuit and the negative-side signal amplifier circuit. |
