A measurement circuit and measurement method of capacitance and inductance parameters based on vector triangle

Abstract

The invention discloses a vector triangle-based capacitance and inductance parameter measurement circuit and a measurement method thereof. It aims to address the problems of high cost of hardware equipment used in existing measurement methods and bottlenecks in accuracy. The invention can measure the three parameters of impedance, quality factor and loss coefficient of the element without directly measuring the signal phase through the acquisition of three voltage signals. The measured element and a known reference resistance form a series circuit. For the convenience of calculation, the reference resistance here is pure resistance, and a sinusoidal signal is used as the excitation of the series circuit. In this system, the reference resistance is known, and at the same time, the excitation signal, the signal at both ends of the measured component, the signal at both ends of the reference resistance, and the effective value of the three signals are measured. This method can measure the impedance of the measured component and the quality factor and loss factor.

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...

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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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