| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sensitivity switching type sensor circuit capable of remarkably reducing the sudden change of signal at the time of gain switching. <P>SOLUTION: The current sensor circuit 1 provided with amplifiers of a high gain 11 and a low gain 12, and the microcomputer 2 determines the detection signal z using the 1st current (the 1st signal x) from the amplifier 11 in the region of the small current i, and determines the detection signal z using the 2nd current (the 2nd signal y) from the amplifier 12 in the region of the large current i. Further, in this embodiment, in the signal transition region for switching the 1st current (the 1st signal x) to the 2nd current (2nd signal y), the value of weighted function with input variables the 1st current (the 1st signal x) and the 2nd current (the 2nd signal y) for gradually switching, is used as the current i (detection signal z), wherein the weighting coefficient k of the weighted function is made to continuously vary to enlarge the influence of the 2nd current (2nd signal y) as increasing the current. <P>COPYRIGHT: (C)2007,JPO&INPIT |
