Excitation drive device for electromagnetic flowmeter, method and application thereof

Abstract

The invention discloses an excitation driving device of an electromagnetic flowmeter, a driving method of the device and application of the device. The device comprises a time sequence generator, an H axle driver, a coil, a direct-current power supply, a resistor, a reference ground and a direct-current ground. The output end of the time sequence generator is connected with the input end of the H axle driver. The output end of the H axle driver is connected with the coil. At each excitation period, the time sequence generator outputs logic signals in a fixed time sequence to control the H axle driver to sequentially output direct-current voltage and pulse voltage. The excitation driving device is applied to heat meters, balance heat meters and cold meters which adopt an electromagnetic measurement principle. The driving method has the advantages that the exciting current setting-up time is reduced, the exciting current is decreased, the turns of the excitation coil are reduced, the circuit is simplified and the power consumption and the cost for excitation are decreased.

Description

technical field [0001] The excitation driving device of the electromagnetic flowmeter and the method and application thereof of the present invention relate to the field of electromagnetic flowmeters with low power consumption and low cost. The invention is applicable to electromagnetic flow meters, heat meters, balance heat meters, cold meters, water meters, sewage meters and the like based on electromagnetic principles. Background technique [0002] Electromagnetic flowmeter is a flow measuring instrument based on the principle of Faraday's electromagnetic induction. Its basic principle is: when a fluid with a conductive medium passes through a magnetic field, the fluid cuts the magnetic force lines and generates an induced potential in the vertical direction of the magnetic field, thereby obtaining the flow of the fluid. flow rate. In order to overcome the influence of the zero point, the electromagnetic flowmeter generally adopts the AC excitation method, that is, alter...

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Problems solved by technology

[0006] 1) Driven by a constant current circuit, the excitation time is long and the power consumption is large;

[0007] 2) Driven by a constant current circuit, the circuit generates heat and consumes a lot of power;

[0008] 3) Driven by a constant current circuit, the number of coil turns is large, and the cost is high;

[0009] 4) Current closed-loop drive, complex circuit

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