AC charging CP signal wake-up and sleep circuit for electric vehicle

Abstract

The invention discloses an AC charging CP signal wake-up and sleep circuit for an electric vehicle. The AC charging CP signal wake-up and sleep circuit comprises a 5V constant power module, a CPPWM signal conversion module, a D trigger module, a selection module, a BMS main control chip and an MCU signal output module. The 5V constant power module is respectively connected with the CPPWM signal conversion module, the D trigger module and the selection module, and provides continuous 5V direct current output; the CPPWM signal conversion module is respectively connected with the charging gun CPPWM input module and the D trigger module; the BMS main control chip is connected with the MCU signal output module, the MCU signal output module comprises two signal output ends, namely an MCUCPCLR and an MCUPOWERLOCK, the output end MCUCPCLR is connected with the D trigger module, and the output end MCUPOWERLOCK is connected with the selection module; and the selection module is connected with the D trigger module. The method not only solves the problem of CP wake-up, but also solves the problem that the BMS continues to work and damages the storage battery after charging is completed, and has important production practice significance.

Description

technical field [0001] The invention relates to the technical field of battery management of new energy vehicles, in particular to a wake-up and sleep circuit of an AC charging CP signal of an electric vehicle. Background technique [0002] At present, AC charging piles are widely used in China to charge electric vehicles and hybrid vehicles. However, the charging of electric vehicles takes a certain amount of time and cannot be precisely controlled. If the BMS does not enter deep sleep after charging, the long-term operation of the BMS in the stationary state of the vehicle will cause damage to the battery and directly affect part of the performance of the vehicle. [0003] The reason for this defect is that if the charging wake-up signal CP is always kept at a voltage of 12V when the charging is completed, the battery management system BMS will continue to maintain the working state and continue to consume power. This power consumption is not supplied by the charging pil...

AI Technical Summary

Problems solved by technology

However, it takes a certain amount of time to charge an electric vehicle, and it cannot be precisely controlled

If the BMS does not enter deep sleep after the charging is completed, the long-term operation of the BMS when the vehicle is stationary will cause damage to the battery and directly affect some performances of the car.

[0003] The reason for this defect is that if the charging wake-up signal CP is always kept at 12V voltage when the charging is completed, the battery management system BMS will also continue to work, resulting in continuous power consumption.

This power consumption is not supplied by the charging pile, but by the on-board DC / DC power supply, which consumes battery power

Therefore, not only the charger cannot enter the dormant state and continue to consume energy, but it also causes great damage to the battery itself.

[0004] Therefore, how to automatically wake up the BMS with the CP signal during charging and how to enable the BMS of the battery management system to perform a low-power state of deep sleep without being continuously affected by the CP signal when charging is complete has become a technical defect. There are two kinds of 12V or PWM. The existing technical solution is to use the PWM signal to control the working state of the BMS, but the circuit of this solution is complicated and the cost is high.

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