Can communication with broken cable

By detecting error conditions in the CAN bus and generating appropriate bias voltages, the problem of bit errors and communication interruptions caused by intermittent disconnections in the CAN bus is solved, enabling more reliable signal transmission.

CN112838971AActive Publication Date: 2021-05-25NXP BV
15 Cites 5 Cited by

Patent Information

Application Number
CN202011275595.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2019-11-22
Filing Date
2020-11-13
Publication Date
2021-05-25
Estimated Expiration
2040-11-13

AI Technical Summary

Technical Problem

Intermittent disconnection of wires in the CAN bus leads to bit errors and data communication interruptions, and it is difficult to effectively solve this problem with existing technology.

Method used

Design a circuit and method to detect error conditions through a CANH error detector and a CANL error detector, generate and apply a bias voltage to a terminal capacitor, and adjust the voltage to overcome intermittent disconnection. The circuit includes a configurable voltage source, a controller, and Multiple level shifters, outputting 1V or 4V bias voltage depending on error conditions.

Benefits of technology

It effectively overcomes the signal transmission problems caused by intermittent disconnection, improves the communication reliability and signal voltage of the CAN bus when disconnected, complies with the ISO11898-2 standard, and avoids communication interruption.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

A circuit for generating a bias voltage for a terminating end capacitor in a controller area network (CAN) bus having a CANH and a CANL terminals is disclosed. The circuit includes a configurable voltage source, a controller to generate a control signal to operate the configurable voltage source, a CANH error detector and a CANL error detector. The CANH error detector and the CANL error detector are configured to provide inputs to the controller. The controller is configured to generate the control signal based on the outputs of the CANH error detector and the CANL error detector. The configurable voltage source is configured to output a bias voltage based on the control signal.
Need to check novelty before this filing date? Find Prior Art