Control system of vehicle-mounted charger and control method thereof

Abstract

The invention provides a control system of a vehicle-mounted charger and a control method thereof, the control system of the vehicle-mounted charger comprises an alternating current power grid, the vehicle-mounted charger, a power battery, a digital controller and a battery management system, the alternating current power grid provides an alternating current power supply signal; the digital controller is used for acquiring and processing an alternating current power supply signal and a direct current power supply signal converted by the vehicle-mounted charger; the battery management system sends a charging instruction to the vehicle-mounted charger according to a processing result; and the vehicle-mounted charger converts an input alternating current power supply signal into a direct current power supply signal according to the charging instruction so as to charge the power battery. By arranging the digital controller, the identification and detection accuracy of the control system of the vehicle-mounted charger can be improved, so that the use safety and the service life of the vehicle-mounted charger and the power battery are improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control, in particular to a control system and a control method for a vehicle charger. Background technique [0002] As the core component of electric vehicles, on-board chargers undertake the heavy responsibility of supplementing energy for electric vehicles. At the same time, they also need to report the status of power grid and battery to BMS (Battery Management System, battery management system) and VCU (Vehicle Control Unit, vehicle controller). Signals such as voltage and current, BMS and VCU make corresponding charging control and vehicle control decisions based on these signals. [0003] With the diversification of AC charging and the increase of charging power, BMS and VCU need to obtain more and more charging information, and the quality requirements for information are also getting higher and higher. However, the on-board charger has insufficient processing of the high-voltage...

AI Technical Summary

Problems solved by technology

For another example, if the single-phase power grid is identified as a three-phase power grid, the BMS will cause the charger to overload and fail after the three-phase charging power is issued.

[0005] (2) The battery voltage and battery AC ripple detection deviation is large during charging

As the charging power increases, the battery voltage and battery AC ripple increase, which will affect battery life and performance, especially when the grid quality is poor, the ripple will further deteriorate

[0006] (3) The accuracy of three-phase power grid state identification is low, such as phase sequence identification error, which will lead to failure to charge or even damage the charger

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