作者：周力任, 潘洋, 朱力

作者单位：上海市计量测试技术研究院, 上海 201203

关键词：直流电流比较仪;磁调制器;偶次谐波函数;曲线拟合;仿真模型

摘要：

为优化直流电流比较仪磁调制器的参数和结构，提升其性能，运用仿真软件研究其传输特性。通过分析磁调制器的两种绕组结构，证明激励绕组兼作检测绕组时，输出电压仍然是偶次谐波函数。偶次谐波的大小和相位可反映外加直流电流的大小和方向，因此提出一种以反双曲正弦函数加多项式的B-H曲线新数学模型，用拟合优度参数验证模型的可靠性。在Matlab中建立双铁芯磁调制器的仿真模型，研究激励电压源（正弦波、三角波、方波）、铁芯饱和深度对输出电压的影响，结果表明：采用方波电压作为激励源最优，且所施加的激励电压不应让铁芯工作在过度饱和状态，会造成检测绕组电压波形的畸变。

Research on magnetic modulator performance of DC current comparator based on simulation
ZHOU Liren, PAN Yang, ZHU Li
Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
Abstract: In order to optimize the parameter and structure of magnetic modulator used in DC current comparator and improve the performance, its transmission characteristics were researched through simulation. Analyzed two structures of magnetic modulator; proved that the output voltage is still even harmonic function when excitation winding doubles as detection winding. The magnitude and phase of the even harmonic reflect the magnitude and direction of the applied DC current. Therefore, a novel B-H curve mathematical model based on the sum of arc-hyperbolic sine function and polynomial was put forward; verify the model reliability with the parameters of fit goodness. Establish simulation model of two cores magnetic modulator based on Matlab, research the influence of excitation voltage source (sine wave, triangle wave, square wave) and saturation depth of core on the output voltage. The result shows that square wave is the optimum of excitation source. Moreover, the applied excitation voltage should not cause the core to work in the over saturated state, which will lead to the distortion of voltage waveform of detection winding.
Keywords: DC current comparator;magnetic modulator;even harmonic function;curve fitting;simulation model
2019, 45(2):99-103  收稿日期: 2017-12-20;收到修改稿日期: 2018-03-01
基金项目: 国家质量监督检验检疫总局项目（2016QK117）
作者简介: 周力任(1985-),男,浙江宁波市人,高级工程师,硕士,主要从事高电压大电流计量的研究
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