Vector-triangle-based measuring circuit and vector-triangle-based measuring method for capacitance inductance parameters

Abstract

The invention discloses a vector-triangle-based measuring circuit and a vector-triangle-based measuring method for capacitance inductance parameters. The circuit and the method aim at solving the problems that according to an existing measuring method, the used hardware equipment is high in cost, and bottle-neck problems exist in precision. Through collection of three voltage signals, three parameters including resistance, a quality factor and a loss coefficient of an element can be measured under the condition that signal phases are not measured directly. The measured element and a known reference resistor form a series circuit, a pure resistor is used as the reference resistor to facilitate calculation, and a sinusoidal signal serves as a stimulus of the series circuit. In the system, the resistance of the reference resistor is already known, meanwhile effective values of three signals including a stimulus signal, a signal of two ends of the measured element, a signal of two ends of the reference resistor are measured, and then the resistance, the quality factor and the loss coefficient of the measured element can be measured with the method.

Description

technical field [0001] The invention belongs to the technical field of measurement and control, and in particular relates to a vector triangle-based capacitance and inductance parameter measurement circuit and a measurement method thereof. Background technique [0002] In many fields of electrical and electronic engineering, the measurement of parameters of inductors and capacitors, such as impedance, quality factor, and loss coefficient, is of great significance. The measurement of non-ideal inductance and capacitance is particularly important, which plays a very important role in the selection of devices in communication and other fields. [0003] At present, the commonly used technology of digital bridge is to measure the parameters of capacitance and inductance by quadrature method. The principle of the orthogonal method is as follows: [0004] Generate a fixed frequency sinusoidal excitation signal Vr, through a series network, such as figure 1 shown by figure 1 The...

AI Technical Summary

Problems solved by technology

[0014] The existing methods all need to generate a standard sinusoidal signal with a phase difference of 90°, and a phase-sensitive detector is required to obtain the phase of the signal, and the phase-sensitive detector is usually expensive and has a bottleneck in accuracy, so it is often introduced here error, resulting in a decrease in measurement accuracy

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