| 摘要 |
A current sensor and a current detecting method in which a sensitivity in at least 100 muA region and a dynamic range of 80 dB are achieved through a simple structure. The current sensor comprises one middle leg magnetic circuit ( 1 ) having opposite ends, two outer leg magnetic circuit ( 2 a, 2 b) being connected with one and the other ends of the middle leg magnetic circuit ( 1 ), respectively, an exciting means ( 3 a) arranged in the outer leg magnetic circuit ( 2 a) and exciting means ( 3 b) arranged in the outer leg magnetic circuit ( 2 b), a flux detecting, means ( 4 ) arranged in the middle leg magnetic circuit ( 1 ), means ( 7 ) for driving the exciting means ( 3 a, 3 b), and a detection circuit ( 8 ) connected with the flux detecting means ( 4 ) and outputting an electric signal interlocked with the flux being detected by the flux detecting means ( 4 ).
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