A method for fault mutual detection of voltage linear isolation circuit and voltage comparison circuit

Abstract

The invention discloses a fault mutual-detection method for a voltage linear isolating circuit and a voltage comparison circuit. The fault mutual-detection method is achieved through the voltage linear isolating circuit (1), the voltage comparison circuit (2) and a comprehensive processing unit (3). The comprehensive processing unit (3) comprises an AD acquisition module (4), a level detection module (5) and a fault detection module (6). According to the fault mutual-detection method, fault mutual detection between the voltage linear isolating circuit (1) and the voltage comparison circuit (2) can be completed, detected voltage signals are isolated and collected through the voltage linear isolating circuit (1) and compared through the voltage comparison circuit (2), and then fault detection is carried out on the detected voltage signals through the comprehensive processing unit (3). Faults of the circuits can be automatically positioned through the fault mutual-detection method, and the fault mutual-detection method can be widely used in the voltage linear isolating circuits based on linear opto-couplers.

Description

technical field [0001] The invention relates to a fault mutual detection method between circuits, in particular to a fault mutual detection method of a voltage linear isolation circuit and a voltage comparison circuit. Background technique [0002] In many industrial measurements such as automatic detection systems, computer data acquisition systems, and industrial control systems, it is often necessary to collect on-site analog signals into microprocessors. In the process of acquisition, various interference signals will enter the microprocessor along with the measured signal, and these signals will be superimposed on the useful measured signal to reduce the accuracy of the measurement. The electrical noise interference introduced into the control system, the circuit under test and the control circuit must be electrically isolated. At present, the voltage isolation circuit based on linear optocoupler is mostly used, but in the process of AD acquisition, whether it is an in...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a fault mutual detection method for a voltage linear isolation circuit and a voltage comparison circuit. After a fault occurs in the circuit, voltmeters, oscilloscopes and other instruments are usually used to measure the voltage and waveform, and the circuit board needs to be disassembled, which costs a lot. matter of time and energy

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