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Adaptive impedance matching module, method and system for high-speed CAN bus

A technology of CAN bus and impedance matching, which is applied in the field of signal processing, can solve the problems of terminal voltage difference change, CAN bus transmission reliability reduction, etc., and achieve the effect of improving reliability and reducing failure rate

Active Publication Date: 2018-05-18
NEW UNITED RAIL TRANSIT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a CAN bus adaptive impedance matching module, method and system, which solves the technical problem that the terminal voltage difference changes due to the change of CAN bus characteristic parameters, and then causes the reliability of CAN bus transmission to decrease

Method used

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  • Adaptive impedance matching module, method and system for high-speed CAN bus
  • Adaptive impedance matching module, method and system for high-speed CAN bus
  • Adaptive impedance matching module, method and system for high-speed CAN bus

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Embodiment 1

[0033] Embodiment 1 provides an adaptive impedance matching module for a CAN bus, the adaptive impedance matching module is adapted to automatically Adapt to adjust the terminal resistance value of this end.

[0034] The installation position of the adaptive impedance matching module is for example but not limited to figure 1 As shown, at least two adaptive impedance matching modules are respectively located at the two terminals of the CAN bus, one adaptive impedance matching module is located near the first node, and the other adaptive impedance matching module is located near the nth node.

[0035] The first node and the nth node are CAN nodes, which are formed using existing technologies, for example, including CAN transceiver isolation circuits and CAN processors.

[0036] Further, the adaptive impedance matching module includes: a voltage detection circuit, a single-chip microcomputer and a digital potentiometer, wherein the voltage detection circuit is used to detect th...

Embodiment 2

[0044] like figure 2 As shown, on the basis of embodiment 1, this embodiment 2 also provides a CAN bus adaptive impedance matching method, including the following steps:

[0045] Step S1, respectively detecting the voltage difference between the signal lines at both ends of the CAN bus when the CAN bus is in a dominant position;

[0046] Step S2, adjusting the terminal resistance value of the corresponding terminal according to the voltage difference of the corresponding terminal.

[0047] Further, the terminal resistance value is adjusted through an adaptive impedance matching module, namely

[0048] The adaptive impedance matching module includes: a voltage detection circuit, a single-chip microcomputer and a digital potentiometer, wherein

[0049] The voltage detection circuit is used to detect the voltage difference between the signal lines at the corresponding ends of the CAN bus;

[0050] The single-chip microcomputer is connected with the voltage detection circuit, ...

Embodiment 3

[0061] On the basis of Embodiment 1 and Embodiment 2, Embodiment 3 also provides an adaptive impedance matching system for CAN bus.

[0062] The adaptive impedance matching system includes: at least two adaptive impedance matching modules, and the two adaptive impedance matching modules are respectively installed on two terminals of the CAN bus.

[0063] Wherein, for the structure and working mode of the adaptive impedance matching module, refer to the specific content of Embodiment 1 and Embodiment 2.

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Abstract

The invention relates to an adaptive impedance matching module, method and system for a high-speed CAN bus. The adaptive impedance matching module is suitable for adaptively adjusting the terminal resistance value of the corresponding end of the CAN bus according to the voltage difference between the signal lines of the corresponding end. The adaptive impedance matching module and method of the present invention are suitable for changing the ambient temperature, bus length, etc., and can realize adaptive adjustment of the terminal resistance to achieve matching according to the change of the dominant bit voltage of the CAN bus terminal. It can improve the reliability of high-speed CAN bus transmission and reduce the failure rate.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to an adaptive impedance matching module, method and system for a high-speed CAN bus. Background technique [0002] At present, 120Ω fixed resistance value or calculated fixed resistance value is mostly used for terminal resistance configuration of high-speed CAN bus, which meets the application of most occasions. However, the matching of terminal resistors is also affected by other factors, such as: the impedance of different bus cables is different; environmental changes will lead to changes in the impedance and capacitive reactance characteristics of bus transmission. In actual use, there are the following situations: [0003] 1. Different communication cables have different characteristic parameters such as impedance and capacitive reactance; [0004] 2. Change the length of the bus or add or delete nodes on the CAN bus according to the needs during use, resulting in changes i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042
CPCG05B19/0428G05B2219/25032
Inventor 仲启端管和平
Owner NEW UNITED RAIL TRANSIT TECH