Vehicle and communication circuit used for same

Abstract

The invention discloses a vehicle and a communication circuit used for the same. The communication circuit comprises a first processor used for outputting a first voltage signal; a voltage following unit used for following the first voltage signal; a switch unit with the control end connected with the output end of the voltage following unit, the first end grounded through a first resistor and a second end connected with one end of a communication line; a second processor; and a comparison unit with a first input end thereof connected with the other end of the communication line and one end ofa second resistor, separately. The comparison unit is used for outputting a second voltage signal to the second processor based on the first voltage signal and a reference voltage. Therefore, the circuit can keep the voltages at the two ends of the first resistor same through the voltage following unit, accordingly keeps current following through the first resistor, the second resistor and the switch unit unchanged, and further keeps the voltage received by a signal reception module unchanged. An anti-interference purpose not only can be realized to enable communication to be more stable, butalso the switch unit is protected against over-burning due to over-current.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a communication circuit for a vehicle and the vehicle. Background technique [0002] At present, the circuit in the vehicle that communicates through the communication line L (hard line) generally adopts the following methods: figure 1 structure shown. [0003] like figure 1 As shown, the left side is the signal sending module, and the right side is the signal receiving module. When the first processor 11 of the signal sending module outputs a low level, the first switch tube Q1 is turned off, the communication line L is pulled up to the preset power supply VCC by the second resistor R2 at the signal receiving end, the communication line L remains at a high level, and the receiving The second processor 21 of the module detects a high level. When the first processor 11 of the signal sending module outputs a high level, the first switch tube Q1 is turned on, the commu...

AI Technical Summary

Problems solved by technology

[0004] However, when the communication line is relatively long resulting in a large impedance, or the communication line is disturbed, the level received by the second processor 21 of the receiving module will change, and in serious cases, a communication error will be caused.

Moreover, when the communication line is short-circuited, the first switching tube may also burn out due to overcurrent

Images