| 摘要 |
PROBLEM TO BE SOLVED: To detect a current value while removing noise of a current waveform detected by using one shunt resistance and suppressing the degradation of accuracy due to an influence of noise removal.SOLUTION: A power supply device 12 includes: a motor current detection unit 20 which detects a current by one shunt resistance; and a filter unit 22 which has filters with different time constants τand τconnected in parallel, allows the current detected by the motor current detection unit 20 to pass the plurality of filters and outputs a current waveform for each of the plurality of filters. The power supply device 12 determines a current value from a current waveform selected on the basis of pulse widths and the time contacts τand τ, out of the plurality of current waveforms outputted from the filter unit 22. |
