Signal detection circuit and method

Abstract

The invention discloses a signal detection circuit comprising a signal input module, an isolation medium, and a signal output module. The signal input module modulates an input signal and a preset detection signal into a first signal. The isolation medium is connected with the signal input module, and performs isolation processing on the first signal to obtain a second signal. The signal output module is connected with the isolation medium and is used for detecting whether the second signal satisfies a preset condition and, if not, modulating the second signal to satisfy a working signal for aconnection device at an output end of the signal output module. An object of the invention is to provide the signal detection circuit and a method. When an abnormality is detected in the signal inputby an input terminal, the signal output at an output terminal is modulated to satisfy the working signal of the back-end connection device, and stability and safety of the working system are provided.

Description

Technical field [0001] The present invention relates to the technical field of signal transmission, in particular to an information detection circuit and method. Background technique [0002] Digital signal isolators are mainly used for the transmission of digital signals. Digital isolation technology is often used in fieldbuses in industrial network environments, military electronic systems, aerospace electronic equipment, and medical equipment, especially in some applications where the environment is relatively harsh. One of the primary reasons for using an isolator is to protect devices (or people) from high voltage; another important reason is to eliminate noise. [0003] The current isolator has the following technical problems: [0004] 1. When the power supply information before isolation is processed through isolation, the power supply input after isolation has a power failure problem, causing the back-end connection device to fail to work normally; dangerous phenomena such ...

AI Technical Summary

Problems solved by technology

[0004] 1. When the power supply information before isolation is in the process of isolation processing, the input power supply after isolation has a power failure problem, causing the back-end connection device to fail to work normally; sudden stop and other dangerous phenomena occur;

[0005] 2. When the isolated information is data information, the isolated output data information signal is lost, resulting in garbled characters, causing the back-end connection device to fail to work normally, causing impact on the back-end components and devices, and affecting the stability of the working system sex and safety

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