| 摘要 |
PROBLEM TO BE SOLVED: To suppress the unnecessary switching of a measurement range owing to the influence of noise etc., in a current sensor having a wide dynamic range in which the measurement range can be switched.SOLUTION: The signal inputted from a first magnetic sensor 1 to a comparison unit 3 passes through a first low-pass filter 11, so that even when noise is gotten mixed in an output S1 of the first magnetic sensor 1, the noise is eliminated by the first low-pass filter 11. Therefore, the comparison operation of the comparison unit 3 becomes less susceptible to the influence of noise, and the selection operation of a selection unit 4 according to a comparison result of the comparison unit 3 also becomes less susceptible to the influence of noise, thereby making the unnecessary switching of a selection range due to the influence of noise less liable to occur.SELECTED DRAWING: Figure 1 |
