Self-measuring circuit and working method thereof

Abstract

The invention provides a self-measuring circuit. The self-measuring circuit comprises a differentiating circuit, an alternating current-direct current conversion circuit and a calculation circuit, wherein the differentiating circuit is used for receiving an input alternating current voltage signal, generating a standard alternating current voltage signal according to the input alternating currentvoltage signal under the condition that a device in the differentiating circuit is a standard device, and generating an alternating current voltage signal to be measured according to the input alternating current voltage signal under the condition that the device in the differentiating circuit is a device to be measured; the alternating current-direct current conversion circuit is used for converting the standard alternating current voltage signal into a standard direct current voltage signal, and converting the alternating current voltage signal to be measured into a direct current voltage signal to be measured; and the calculation circuit is used for calculating an electrical parameter value of the device to be measured according to the standard direct current voltage signal, the directcurrent voltage signal to be measured and an electrical parameter value of the standard device corresponding to the device to be measured. The invention also provides a working method of the self-measuring circuit. The self-measuring circuit has a simple structure and low cost, is easy for large-scale production and application, and has high practicability.

Description

Technical field[0001]The present invention belongs to the technical field of test circuits, and in particular, relates to a self-measuring circuit capable of measuring the capacitance value of a capacitor or the resistance value of a resistor and a working method thereof.Background technique[0002]The existing measurement methods of electronic components, for example, the measurement methods of the capacitance of capacitors include resonance method, charge-discharge method, bridge method, etc.[0003]The resonance method is to connect the capacitor under test into an LC circuit or an RC circuit, and convert the strain of the capacitor under test into the change of the resonance frequency, and calculate the capacitance value of the capacitor under test through the frequency change. However, this method is not suitable for automatic measurement and online measurement, so it is not convenient for production use.[0004]The charging and discharging method uses an AC signal to charge the capa...

AI Technical Summary

Problems solved by technology

However, this method is costly and has a nonlinear output. Among them, the nonlinear output refers to the nonlinear relationship between the measured capacitance and the adjustable resistance or adjustable capacitance, which makes it difficult to calculate the measured capacitance.

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