| 摘要 |
A current sensor comprises: two cores 11, 12 that configure closed magnetic circuits surrounding a conductor 100 where a current to be measured flows and are arranged adjacent to each other; two coils 21, 22 that are wound respectively around the two cores 11, 12 and are connected in series to generate a magnetic flux in surrounding directions opposite to each other in the two cores 11, 12; an excitation power supply 30 that applies an AC current with a superimposed DC current to the two coils 21, 22; and a detection circuit 40 that is connected to a connection point P of the two coils 21, 22. It is possible to obtain the current sensor being capable of high precision measurement up to high frequencies and also capable of reducing power consumption. |
