CAN bus communication isolation circuit and method

Abstract

The invention discloses a CAN bus communication isolation circuit and method. The CAN bus communication isolation circuit comprises a CAN communication chip which comprises a CAN transceiver, a power supply isolator, a power supply input end, an isolation voltage input end and an isolation voltage output end. The power supply input end is connected with one side of the power supply isolator. The isolation voltage output end is connected with the other side of the power supply isolator. The isolation voltage input end is connected with the CAN transceiver. The isolation voltage input end is electrically connected with the isolation voltage output end. The power supply and the communication signals of the primary side and the secondary side of the CAN communication chip are isolated so that external isolation of integral CAN communication is realized, a great communication effect is achieved and communication quality is greatly enhanced.

Description

technical field [0001] The invention relates to the field of CAN bus, in particular to a CAN bus communication isolation circuit and method. Background technique [0002] In the development of existing controllers, CAN communication has an irreplaceable advantage. Compared with the traditional RS485 communication method, CAN bus communication is a multi-master serial communication bus, which greatly improves communication efficiency. At the same time, its design specifications require With the advantages of high bit rate, high impedance, ease of use, and long transmission distance, CAN communication undoubtedly has an irreplaceable position for today's extremely fast product update. [0003] However, the use of CAN communication is greatly restricted by the communication quality of the communication line. Therefore, the power supply of the CAN communication chip and the motherboard power supply are often shared during circuit design, so that the interference ripple of the mo...

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Problems solved by technology

[0004] In the embodiment of the present invention, a CAN bus communication isolation circuit and method are provided to solve the problem that in the prior art, the power supply of the CAN communication chip is shared with the motherboard power supply, so that the interference ripple of the motherboard power supply will directly affect the CAN communication quality.

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