| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the deterioration of the detecting accuracy of currents running through a measurement object cable. <P>SOLUTION: The current detection device includes: a magnetic sensor 3 having a sensor element 31 integrated into a magnetic core 2 for outputting a detection signal S3 whose amplitude changes in proportion to a current value I1 of currents I running through a measurement object cable 11; a feedback coil 4 configured so as to be wound around the magnetic core 2 with a plurality of layers; a signal generation part 5 for outputting excitation currents I2 to the sensor element 31; a driving part 6 for inputting the detection signal S3, and for supplying driving currents Id to decrease the amplitude of the detection signal S3 to the feedback coil 4; and a detection resistance 7 arranged in the current path of the driving currents Id for converting the driving currents Id into a voltage Vd and outputting the voltage Vd. The feedback coil 4 is divided into a first feedback coil 4a at a winding-start end side and a second feedback coil 4b at a winding-finish end side in the site of an intermediate layer, and the detection resistance 7 is connected between a pair of leader lines 43 and 44 led out of two ends positioned at the site of the intermediate layer in each of the feedback coils 4a and 4b. <P>COPYRIGHT: (C)2013,JPO&INPIT |
