Excitation circuit for electromagnetic flow meter, and electromagnetic flow meter

摘要

An excitation circuit includes a second switch and a third switch that are respectively connected between a third signal line and a first end of an excitation coil and between the first end of the excitation coil and a fourth signal line and that are switched in accordance with intervals at which an excitation polarity is switched, a fourth switch and a fifth switch that are respectively connected between the third signal line and a second end of the excitation coil and between the second end of the excitation coil and the fourth signal line and that are switched in accordance with the intervals at which the excitation polarity is switched, a switching control circuit that controls a first switch connected between a first signal line and the third signal line at intervals shorter than the intervals at which the excitation polarity is switched.