电绝缘测试测量系统用正交移相器

I. Kostiukov
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引用次数: 0

摘要

正交移相器广泛应用于介电损耗系数和电容测量系统的研制。本文介绍了相移器的实现实例,目的是使相移值达到90º,用于电气绝缘技术状况监测和诊断的测量系统。开发的解决方案是基于AD633集成电路中模拟信号乘法器的应用。所需要的相移值是通过将一个以一定角度预移的输入谐波信号加到一个幅度减小且初始相位相反的信号中来提供的。本文还着重于原理图解决方案的开发,该解决方案可用于消除许多实际应用中输入和输出信号幅度之间的不理想差异。这种振幅的对齐是通过检测它们的平均整流值来提供的,随后将它们的比率乘以在90°处移位的信号,并降低幅度。设计的原理方案包含了模拟电路的应用,包括输入移相器、低通滤波器、电压和放大器、两个平均整流值检测器、三个模拟乘法器和一个分压器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quadrature phase shifter for the measurement systems of testing of electrical insulation
Quadrature phase shifters are widely used in practice of development of measurement systems intended for the measurements of dielectric dissipation factor and electrical capacitance. This article presents the examples of implementation of phase shifters intended to obtain the value of phase shift equal to 90º for the applying in measurement systems of monitoring and diagnosing the technical condition of electrical insulation. The developed solutions are based on applying of the analog signal multiplier implemented in the AD633 integrated circuit. The required value of phase shift is provided by adding a pre-shifted at a certain angle input harmonic signal to a signal with the reduced amplitude and the opposite initial phase. The article is also focused on the development of schematic solutions which can be used in order to remove the undesirable for many practical applications discrepancy between the amplitudes of the input and the output signals. This alignment of amplitudes is provided by the detection of their average rectified values with subsequent multiplication of their ratio by the shifted at 90º signal with the reduced amplitude. The designed schematic solutions imply the applying of analog circuits which contain the input phase shifter, low pass filter, voltage summing amplifier, two detectors of average rectified values, three analog multipliers and one voltage divider.
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