Line breakage detection circuit

Abstract

The invention provides a line breakage detection circuit relating to the technical field of electronic circuits. The line breakage detection circuit comprises a first signal input terminal, a second signal input terminal, a voltage clamp module, a rectification module, a processing module and a signal output terminal, wherein the first signal input terminal and the second signal input terminal arerespectively electrically connected with the rectification module and an encoder, the rectification module, the processing module and the signal output terminal are sequentially electrically connected, the voltage clamp module is respectively electrically connected with the first signal input terminal and the second input terminal; and when the first signal input terminal does not receive an input signal, a voltage value of the first signal input terminal is clamped at a first voltage by virtue of the voltage clamp module, and when the second signal input terminal does not receive the input signal, the voltage value of the second signal input terminal is clamped at a second voltage by virtue of the voltage clamp module, so that the line breakage detection circuit can detect a differentialsignal, also can detect a single-ended signal and has broader application prospect.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a disconnection detection circuit. Background technique [0002] An encoder is a device that converts the rotation angle / displacement into a digital signal. In practical applications, it is usually necessary to use a wire break detection circuit to detect whether the encoder is broken. [0003] However, in the existing technology, most encoder disconnection detection circuits are aimed at absolute value encoders and incremental encoders, and are all designated as differential disconnection detection, and cannot be compatible with single-ended and differential modes. , the application scenarios are narrow; and the disconnection detection circuit compatible with the two modes usually increases the devices and IC chips of the disconnection detection circuit, which not only increases the area of ​​the circuit board, but also increases the cost. Contents of the invention...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing technology, most encoder disconnection detection circuits are aimed at absolute value encoders and incremental encoders, and are all designated as differential disconnection detection, and cannot be compatible with single-ended and differential modes. , the application scene is narrow; and the disconnection detection circuit compatible with the two modes usually increases the devices and IC chips of the disconnection detection circuit, which not only increases the area of ​​the circuit board, but also increases the cost

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