Power supply control circuit for electric vehicle battery management system

Abstract

The present application relates to a power supply control circuit for an electric vehicle battery management system. The power supply control circuit includes a power detection circuit, a control signal circuit and two or more field effect transistor (FET) driving circuits, wherein the input terminal of each FET driving circuit is used for connecting different types of charging power supplies; thecontrol terminal of each FET driving circuit is connected with a control signal circuit; the output terminal of each FET driving circuit is connected with a power supply of the control circuit; the power supply detection circuit is used for connecting the charging power supply and the external controller, and the control signal circuit is used for connecting the external controller; the output voltage of the external power supply is detected by the power supply detection circuit; the control signal circuit controls the field effect transistor driving circuits of the charging power source withthe highest output voltage to conduct, and the charging power source with the highest output voltage supplies power to the control circuit; and by means of the low conduction resistance of the fieldeffect transistor during conducting, the heat loss can be effectively reduced when passing through the large current, thus improving the reliability and stability of the system.

Description

technical field [0001] The present application relates to the technical field of charge management, in particular to a power supply control circuit of an electric vehicle battery management system. Background technique [0002] Electric vehicles refer to transport vehicles that use electric energy as the driving force and are driven by traction motors. Common electric vehicles mainly include railway trunk line electric vehicles, subway electric vehicles, urban trams, light rail electric vehicles, battery electric vehicles, etc. [0003] In the power circuit of the battery management system of electric vehicles, in order to prevent users from improper operation such as reverse connection of the power supply during use, diodes are often used to prevent reverse connection to ensure the reliability of the battery management system. The power supply circuit of the traditional electric vehicle battery management system uses a diode to prevent the reverse connection of the power su...

AI Technical Summary

Problems solved by technology

The power supply circuit of the traditional electric vehicle battery management system uses a diode to prevent the reverse connection of the power supply. The power consumption is doubled, and there is a problem of serious heating when the load is large. The power circuit of the battery management system of the traditional electric vehicle has the disadvantage of low reliability.

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