Communication interface circuit of automobile bus communication line

By designing an automotive bus communication interface circuit that includes voltage supply circuit, differential drive circuit and control circuit, the problems of large equipment size, high cost and poor communication signal quality in the prior art are solved, and the multi-protocol switching functions of miniaturization, low cost and high signal quality are realized.

CN112416822BActive Publication Date: 2025-03-25SHENZHEN BONOR TECH CO LTD
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Patent Information

Application Number
CN202011288266.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-11-17
Publication Date
2025-03-25
Estimated Expiration
2040-11-17

AI Technical Summary

Technical Problem

When existing automotive diagnostic equipment realizes switching of multiple communication protocols, it adopts relay or analog switch solutions, resulting in large size, high cost and impact on the communication signal quality.

Method used

Design a communication interface circuit for the automotive bus communication line, including voltage supply circuit, differential driving circuit and control circuit. By controlling the differential driving circuit to output communication protocol signals or high-resistance state, it is possible to switch multiple communication protocols without the need for relays or analog switches.

Benefits of technology

The communication interface circuit of the automobile bus with small size, low cost and good communication signal quality is realized, and it can be directly hung on the communication bus without the need for relays or analog switches, realizing the need to transmit multiple communication protocols on the same communication line.

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Abstract

The embodiment of the present invention discloses a communication interface circuit of an automobile bus communication line, the communication interface circuit includes a voltage supply circuit, a differential drive circuit and a control circuit, when the comprehensive diagnostic device communicates normally with the automobile ECU end, the control circuit controls the differential drive circuit to output the communication protocol signal; outside the normal communication between the comprehensive diagnostic device and the automobile ECU end, the control circuit controls the differential drive circuit not to output the communication protocol signal, and the output of the differential drive circuit is in a high impedance state. Compared with the relay solution used in the prior art, the automobile communication line communication bus communication interface circuit provided by the present invention is not only small in size and low in cost, but also can achieve good communication signal transmission, so as to achieve the purpose of directly hanging on the communication bus without relay or analog switch switching, and realize the need to transmit multiple communication protocols on the same communication line.
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