On-board CAN power supply circuit for electric vehicles, electric vehicles and their power supply systems

Abstract

The invention discloses a vehicle-mounted CAN power supply circuit for an electric vehicle, the electric vehicle and a power supply system of electric vehicle. A power supply system of the electric vehicle includes a high-voltage power supply and a low-voltage power supply; the vehicle-mounted CAN power supply circuit includes a CAN power supply unit and an enabling unit; the CAN power supply unit is used for an output CAN power supply to supply power to a CAN bus of the electric vehicle; the output end of the enabling unit is connected with the enabling end of the CAN power supply unit, and the enabling unit is used for receiving a control signal output by a control chip of the high-voltage power supply; when the high-voltage power supply of the electric vehicle normally supplies power, the control chip of high-voltage power supply outputs a first control signal to the enabling unit to enable the enabling unit to output an enabling signal to the CAN power supply unit, and the CAN power supply unit works; when the high-voltage power supply of the electric vehicle is cut off, the control chip of high-voltage power supply outputs a second control signal to the enabling unit to enable the enabling unit to stop outputting of the enabling signal to the CAN power supply unit, and the CAN power supply unit stops working, therefore, the current consumption in the standby state can be reduced, and the qualified rate of the inspection is improved.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a vehicle-mounted CAN power supply circuit of an electric vehicle, a power supply system of the electric vehicle and an electric vehicle. Background technique [0002] Electric vehicles in the related art usually use dual power supplies, that is, a high-voltage power supply and a low-voltage power supply. When the electric vehicle is in a standby or security state, for example, when a fuel-powered vehicle is turned off, the high-voltage power supply stops supplying power, and only the low-voltage power supply supplies power. At this time The power consumption of electric vehicles needs to be reduced to extend the standby time. [0003] In related technologies, electric vehicles usually have a CAN (Controller Area Network, controller area network) bus communication function. When the electric vehicle is in a standby state, power consumption is reduced by controlling the veh...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the related technology is that the current of the CAN bus chip can reach 100μA level in the sleep state, and at this time the power supply unit of the CAN bus chip is in a light load state, and the quiescent current of the peripheral circuit can reach 1mA, which is higher than the technology of the car factory. The upper limit value of standby current specified in the requirements (for example, 700μA)

Due to the discrete nature of electronic device parameters, when conducting random inspections on mass-produced electric vehicles, it is prone to the problem of unqualified vehicle inspections caused by excessive standby current

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