Electromagnetic water meter circuit with high efficiency and small interference

Abstract

The invention relates to an electromagnetic water meter circuit with high efficiency and small interference, in particular to an excitation circuit design and a power supply circuit design. Theelectromagnetic water meter circuit comprises a flow control voltage source efficient excitation circuit, a power supply circuit without a negative power supply, an amplification and processing circuit of isolation polarization voltage, an A / D conversion circuit, an empty pipe detection circuit, an excitation voltage detection circuit and a coil current detection circuit. According to the invention, excitation efficiency can be improved, excitation power consumption and overall power consumption can be reduced, power supply types can be simplified, polarization voltage interference can be filtered, battery consumption can be further reduced, and the flow measurement precision can be improved.

Description

technical field [0001] The invention relates to the field of flow measurement of electromagnetic water meters and electromagnetic flowmeters, in particular to the design of excitation circuits and power supply circuits. The invention can improve excitation efficiency, reduce power consumption of electromagnetic water meters, and filter out polarization voltage interference, and is suitable for battery-powered electromagnetic The water meter adopts the present invention, which can prolong the service life of the electromagnetic water meter and improve the accuracy of flow measurement. Background technique [0002] Electromagnetic water meter has many advantages for fluid flow rate measurement. Compared with other ultrasonic water meters and mechanical water meters, it has the advantages of high measurement accuracy, good linearity, wide range ratio, wear resistance, and no temperature influence, so it is widely used. It is used in urban water supply industry and agricultural ...

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Problems solved by technology

[0002] Electromagnetic water meter has many advantages for fluid flow rate measurement. Compared with other ultrasonic water meters and mechanical water meters, it has the advantages of high measurement accuracy, good linearity, wide range ratio, wear resistance, and no temperature influence, so it is widely used. It is used in urban water supply industry and agricultural irrigation industry; the principle of electromagnetic measurement of fluid flow is: according to Faraday's law of electromagnetic induction, when a conductive fluid flows through a uniformly distributed magnetic field, due to the action of cutting magnetic force lines, the contact with the fluid can be detected on the electrodes of the conductor. The average speed is proportional to the induced electromotive force. Therefore, the volume flow rate is calculated according to the cross-sectional area of ​​the pipeline by detecting the induced electromotive force. At present, the existing electromagnetic water meter circuit has low excitation efficiency, large power consumption of the whole machine, many types of power supply voltage, and extreme In order to solve the above problems, our company has developed an electromagnetic water meter detection circuit with high efficiency and low interference. The patent of this invention can improve the excitation efficiency, reduce the excitation power consumption and the power consumption of the whole machine, Simplify the type of power supply, filter out polarization voltage interference, further reduce battery consumption, and improve flow measurement accuracy

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