The invention provides an isolation type CAN wake-up circuit. The isolation type CAN wake-up circuit comprises a CAN chip, a first isolation circuit, a second isolation circuit and an interference suppression circuit, wherein the first isolation circuit, the second isolation circuit and the interference suppression circuit are connected with the CAN chip; the connection of pins on the CAN chip comprises the following steps: a TXD pin is connected with an MCU through the first isolation circuit, an RXD pin is connected with the MCU through the second isolation circuit, a CANH pin and a CANL pin are connected with a CAN bus through the interference suppression circuit, a VBAT pin and a WAKE pin are connected with a wake-up trigger signal, and an INH pin is connected with a power supply of the MCU; and if the MCU needs to be awakened, a VBAT pin and a WAKE pin of the CAN chip receive an awakening trigger signal, act on an INH pin and generate an awakening signal to awaken the power supply of the MCU. According to the invention, the awakening mode of the electric bus can be optimized, the CAN signal input and output end is electrically isolated, the anti-interference capability is enhanced, and the working state is stable.
本发明提供一种隔离型CAN唤醒电路,包括:CAN芯片、与所述CAN芯片连接的第一隔离电路、第二隔离电路以及干扰抑制电路;所述CAN芯片上引脚的连接包括:TXD引脚通过所述第一隔离电路与MCU连接,RXD引脚通过所述第二隔离电路与所述MCU连接,CANH引脚和CANL引脚通过所述干扰抑制电路与CAN总线连接,VBAT引脚和WAKE引脚接唤醒触发信号,INH引脚与MCU的电源连接;如果需要唤醒所述MCU,所述CAN芯片的VBAT引脚和WAKE引脚接收唤醒触发信号,作用于INH引脚,产生唤醒信号唤醒所述MCU的电源。本发明能够优化电动大巴的唤醒模式,对CAN信号输入输出端实现电气隔离,抗干扰能力增强,工作状态稳定。
Isolated CAN wake-up circuit
隔离型CAN唤醒电路
2024-05-31
Patent
Elektronische Ressource
Chinesisch
IPC: | B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |
Tbox disconnection wake-up circuit and wake-up method
Europäisches Patentamt | 2023
|