Mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply
An electromagnetic flowmeter and excitation control technology, applied in the application of electromagnetic flowmeter to detect fluid flow, volume/mass flow generated by electromagnetic effects, liquid/fluid solid measurement, etc., can solve problems such as power dissipation and ensure accuracy , Improving the accuracy of excitation frequency and improving the effect of dynamic response speed
An electromagnetic flowmeter and excitation control technology, applied in the application of electromagnetic flowmeter to detect fluid flow, volume/mass flow generated by electromagnetic effects, liquid/fluid solid measurement, etc., can solve problems such as power dissipation and ensure accuracy , Improving the accuracy of excitation frequency and improving the effect of dynamic response speed
CN101644591AActive Publication Date: 2010-02-10HEFEI UNIV OF TECH +1
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[0019] The present invention will be further described below in conjunction with accompanying drawing:
[0020] The design concept of the present invention is to use a high-voltage source for power supply and use a linear power supply to improve the dynamic characteristics of the excitation system, thereby providing conditions for high-frequency single-frequency square-wave excitation and dual-frequency square-wave excitation with a stable zero point; more accurately detect The excitation current provides conditions for signal processing in order to correct the sensor output signal; it is controlled by a digital signal processor (DSP) and equipped with an external hardware circuit to generate an excitation sequence to improve the accuracy of the excitation frequency; it adopts a current bypass circuit shunt method , to reduce heat generation on the linear power supply. Its purpose is to provide accurate high-frequency excitation or dual-frequency excitation, and at the same ti...
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The invention relates to a mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply, comprising a constant current source circuit, a current bypass circuit,an exciting coil driving circuit, an excitation time sequence generating circuit and a galvo circuit. A high voltage power supply is adopted for supplying power, the constant current source is constructed by linear power supply to supplying electricity for the exciting coil driving circuit, the current bypass circuit is jointed in parallel with the input / output end of the linear power supply to solve the problem of energy dissipation, the exciting coil driving circuit is composed of an H bridge and a control circuit thereof, the galvo circuit is bridge-jointed between the lower end of the H bridge and a reference ground, and a digital signal processor (DSP) is used for controlling multiple switches and an electrical level matching device to generate time sequence and control the action ofthe exciting coil driving circuit. The excitation control system can obviously improve excitation frequency range and excitation frequency preciseness, is suitable for single frequency high frequencysquare wave excitation or dual frequency square wave excitation, and can simultaneously provide more exact current detection to correct the flow signal processing result.
Description
technical field [0001] The invention relates to the field of flow detection, and is an electromagnetic flowmeter excitation control system based on a linear power supply and using a DSP control hardware circuit that can realize single-frequency high-frequency square wave and double-frequency square wave excitation. Background technique [0002] The electromagnetic flowmeter applies a magnetic field to the measured fluid through the excitation coil, and the measured fluid moves in the magnetic field to induce an induced electromotive force, and the fluid flow velocity can be obtained by detecting and processing the electromotive force signal, thereby realizing flow measurement. At present, the excitation method is mainly low-frequency square wave excitation, that is, the excitation coil is powered by a constant current source, and the direction of the current in the excitation coil is constantly switched, so that the excitation current changes periodically between positive and...
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Patent Timeline
10 Feb 2010
Publication
CN101644591A
- IPC
- G01F1/58; G01F1/60
- Inventors
- εΎη§ε; ζ¨ειΎ