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Protection circuit of automobile bus communication circuit

A technology for protecting circuits and communication lines, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection devices for automatic disconnection, etc., can solve the problem of incomplete protection and small equipment. Solving problems such as chemical barriers, large circuit board area, etc., to avoid slow response, reduced PCB space, and small device footprint

Active Publication Date: 2018-01-19
SHENZHEN BONOR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Because PTC is a temperature-sensitive device, its response time is slow, so its protective effect is incomplete
[0006] 2. The use of PTC on each communication line is costly and occupies a large area of ​​the circuit board, which poses a certain obstacle to the miniaturization of equipment

Method used

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  • Protection circuit of automobile bus communication circuit
  • Protection circuit of automobile bus communication circuit

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with accompanying drawing:

[0018] Such as figure 1 Shown: the present invention comprises communication interface circuit, interface protection circuit, protocol configuration matrix circuit, the signal output end of communication interface circuit is connected with the signal input end of interface protection circuit, the output end of interface protection circuit is connected with the signal input of protocol configuration matrix circuit end connection.

[0019] Such as figure 2 As shown, the communication interface circuit includes a first clamping triode group and a second clamping triode group, and the first clamping triode group includes a first triode Q17, a first sampling resistor R132 and a first current-limiting isolation resistor R143, The base of the first triode Q17 is connected in series with the first sampling resistor R132, the collector of the first triode Q17 is connected in seri...

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PUM

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Abstract

The invention discloses a protection circuit of an automobile bus communication circuit. The protection circuit includes a communication interface circuit, an interface protection circuit and a protocol configuration matrix circuit; the signal output end of the communication interface circuit is connected with the input end of the communication interface protection circuit, and the output end of the communication interface protection circuit is connected with the input end of the protocol configuration matrix circuit. The invention provides the protection circuit of the automobile bus communication circuit, real-time overcurrent protection is achieved, the problems that the PTC reaction speed is low and protection is not complete and thorough are solved, compared with PTCs used in all circuits, the cost of several transistors and resistors is almost negligible, and at the same time, the occupied PCB space is shrunk. The protection circuit had the advantages that the circuit structure is simple, devices occupies small space, full protection is achieved rapidly in real time, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of protection circuits, in particular to a protection circuit for automobile bus communication lines. Background technique [0002] Since the 1980s when automobiles entered the ECU (Electronic Control Unit) control period, automobile manufacturers represented by the three major U.S. automobile companies have begun to use ECUs to monitor automobile control systems. However, each manufacturer's ECU and fault diagnosis equipment are developed by each automobile manufacturer, and the diagnostic interfaces and communication methods are different, so they cannot be used in common. [0003] Therefore, various comprehensive diagnostic equipments have been developed in the automobile aftermarket. It scans the protocols of each communication pin of the automobile OBD-16 diagnostic seat, analyzes and determines the protocol type of the electric control system of the automobile, and then realizes the detection of variou...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H3/087
Inventor 叶懿任鹏
Owner SHENZHEN BONOR TECH CO LTD
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