Alternating current and direct current voltage true virtual value measurement method capable of automatically identifying type of signal

Abstract

The invention discloses an alternating current and direct current voltage true virtual value measurement method capable of automatically identifying the type of a signal. The method comprises the following steps that a measured alternating current and direct current signal is input to the input end of a voltage dividing buffer (1), and a low-impedance signal is output to a level translation circuit (2) and a zero-crossing synchronization circuit (4) after impedance conversion; an analogue signal output by the level translation circuit (2) enters the analogue input end of an A / D (analogue / digital) converter (3), and a digital signal obtained by conversion is transmitted into a microprocessor (5); the reference voltage output of the A / D converter (5) is connected to the reference voltage input end of the level translation circuit (2) for the determination of a new reference level point after the rising of reference zero level; the microprocessor (5) detects a synchronization pulse output by the zero-crossing synchronization circuit (4) through built-in measurement control software; a measurement result is output through a display interface and a communication interface. According to the method, alternating current, direct current and hybrid alternating current and direct current types are automatically identified, and an alternating current voltage true virtual value, a direct current voltage value and a hybrid alternating current and direct current true virtual value are automatically measured.

Description

technical field [0001] The invention relates to the technical field of AC and DC current signal measurement, in particular to a true RMS AC and DC voltage measurement method. [0002] Background technique [0003] For the measurement of the true RMS value of the AC and DC voltages, the usual method is: according to the type of the measured voltage, manually switch the measured voltage to the corresponding AC or DC input channel for measurement. In an automatic measurement system, if the type of voltage to be measured is unknown, the intervention of manual judgment switching will directly reduce the degree of automation of the measurement system. At the same time, if the measured voltage is a mixed AC and DC voltage, the process of using the existing measurement method will be more cumbersome, and it is difficult to obtain comprehensive measurement parameters. [0004] Contents of the invention [0005] The purpose of the present invention is to solve the above-mentioned...

AI Technical Summary

Problems solved by technology

In an automatic measurement system, if the type of voltage to be measured is unknown, the intervention of manual judgment switching will directly reduce the degree of automation of the measurement system

At the same time, if the measured voltage is a mixed AC and DC voltage, the process of using the existing measurement method will be more cumbersome, and it is difficult to obtain comprehensive measurement parameters

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