基于高低压电源切换的双环恒流控制电磁流量计励磁控制系统

doi:10.3969/j.issn.1000-1158.2011.03.01

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Abstract Based on the simulation analysis of constant excitation current control,a novel method of dual-loop control for constant excitation current control is proposed in order to improve high-frequency square wave excitation performance of the electromagnetic flowmeter. This method includes an outer loop for high/low voltage power switching and an inner loop for current fine-tuning,which can ensure zero satiability of the sensor output signal and high power efficiency of the excitation system when electromagnetic flowmeter is excited by high-frequency square wave. A square wave excitation control system is designed to realize to excite the coil by high frequency precisely. The simulation results show that the higher the high voltage power,the more widely the excitation frequency can be expanded. The experimental results show that the speed of constant excitation current control is fast and the sensor output signal of the electromagnetic flowmeter has steady zero when the excitation system is excited by high-frequency square wave.

Key words： Metrology Electromagnetic flowmeter Excitation control Power switching Dual-loop constant current control High-frequency excitation

PACS:

TB937

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	Articles by authors
	YANG Shuang-long
	WANG Gang
	XU Ke-jun
	SHI Lei
	LI Ji-chun

Cite this article:

YANG Shuang-long,WANG Gang,XU Ke-jun, et al. High/Low Voltage Power Switching Based on Dual-Loop Constant Current Control for Electromagnetic Flowmeter Excitation Control System[J]. Acta Metrologica Sinica, 2011, 32(3): 193-197.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2011.03.01 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2011/V32/I3/193