| 摘要 |
PURPOSE: To remove noise indirectly without requiring any noise removing circuit for exclusive use by sampling the overcurrent a plurality of times with different timing and employing the mean value of sampling data as a measurement. CONSTITUTION: A microcomputer 20 differentiates the timing for sampling the overcurrent a plurality of times and a plurality of overcurrent sampling data is acquired at different timing. Mean value of the plurality of sampling data is then calculated and employed as a measurement. Consequently, even if the sampling timing matches the noise generation timing, the matching does not endure. Since the number of data sampling times matching the noise period is decreased in the plurality of times of data sampling, accuracy of measurement is enhanced. With such method, the effect of noise can be suppressed indirectly without requiring any noise removing circuit. |
