A current-mode drive type anti-electromagnetic interference lin driver

Abstract

The invention provides a current mode driving type anti-electromagnetic interference LIN driver which comprises a slope control circuit, an analogue buffer, a potential-divider network, a current pre-driving stage, an output driving stage and an external loader. The slope control circuit is used for shaping the edges of signals, the analogue buffer is connected with the slope control circuit and used for shielding effects of circuit load on the slope control circuit, the potential-driver network is connected with the analogue buffer and used for linearly reducing voltage of output signals of the analogue buffer, the current pre-driving stage is connected with the potential-divider network and used for linearly converting voltage signals output by the potential-divider network into current signals, the output driving stage is connected with the current pre-driving stage and used for linearly amplifying output signals of the current pre-driving stage, and the external loader is connected with the output driving stage. The current mode driving type anti-electromagnetic interference LIN driver solves the related problem that an existing LIN bus driver is insufficient in antijamming capability in complex electromagnetic environments, enhances robustness of an LIN bus and further guarantees safety and reliability of industrial application of automobiles and the like.

Description

technical field [0001] The invention relates to an anti-electromagnetic interference LIN driver, in particular to a current-mode driven anti-electromagnetic interference LIN driver. Background technique [0002] The LIN bus structure is a widely used connection method in the control of industrial distributed electronic systems such as automobiles. The function of the LIN bus driver is to convert the TXD signal generated by the protocol controller into an output signal whose slope and waveform are strictly limited, and send it to the LIN bus. Due to the complex electromagnetic environment in the application environment, in terms of electromagnetic compatibility, the design of the LIN driver must consider two aspects: one is electromagnetic radiation (Electromagnetic Emission, EME for short), the LIN bus signal cannot produce serious electromagnetic radiation, otherwise it will interfere The normal operation of adjacent circuits or systems; the second is anti-electromagnetic ...

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a current-mode driven anti-electromagnetic interference LIN driver, which is used to solve the deficiency of the anti-interference ability of the LIN bus driver in a complex electromagnetic environment in the prior art , leading to problems such as high bit error rate of dominant and recessive levels on the bus, poor transmission delay symmetry of signal rising and falling edges, and easy interference of signal conversion edges, so as to improve its anti-EMI ability and enhance bus performance. Robustness to ensure safety and reliability in automotive and other industrial applications

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