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Excitation circuit for electromagnetic flow meter, and electromagnetic flow meter
Excitation circuit for electromagnetic flow meter, and electromagnetic flow meter
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机译:电磁流量计的励磁电路及电磁流量计
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摘要
An excitation circuit includes a first switch connected between a third signal line and a first signal line supplied with a first DC voltage, a second switch connected between the third signal line and a second signal line supplied with a second DC voltage higher than the first DC voltage, third to sixth switches that reverses a polarity of a voltage on the third signal line to change a direction of an excitation current, a switching control circuit that switches the first switch at intervals shorter than intervals at which an excitation polarity is switched so that the excitation current has a first target value, and a switching control circuit that turns on the second switch when the absolute value of the excitation current is smaller than a second target value less than or equal to the first target value and that turns off the second switch when the excitation current is larger than the second target value.
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