Electric appliance starting protecting device for electric vehicle

Abstract

The invention provides an electric appliance starting protecting device for an electric vehicle. The protecting device comprises a starting circuit and a protecting circuit, wherein the starting circuit comprises an input end, a load end and a main current limiting resistor, and the main current limiting resistor is arranged between the input end and the load end; the input end is connected with a power battery, and the load end is connected with a power electric appliance part; the protecting circuit and the starting circuit are connected in parallel; the protecting circuit is connected to a control system of the electric vehicle. The protecting circuit comprising a damage judging loop and an overcurrent feedback loop can be scientifically and reasonably selected to be applied to and carried on the electric vehicle according to actual conditions, the power electric appliance system is protected, and meanwhile, the overall reliability of the electric vehicle is improved.

Description

technical field [0001] The invention relates to an electrical system of an electric vehicle, in particular to an electrical starting protection device for an electric vehicle. Background technique [0002] As energy and environmental issues have become the focus of attention worldwide, electric vehicles powered by power batteries have become one of the main directions for the development of the automobile industry because of their environmental protection and clean characteristics. At the moment of starting the high-power electrical appliances of electric vehicles, the starting current is very large (it is related to the capacitance of the DC terminal in the load terminal, and the starting current can reach 500A to 2000A according to the size of the load capacitance.) Such an instantaneous large current may cause The contacts of the high-voltage relay are burned, or the life of the capacitor in the load is greatly affected. In order to prevent the large current impact at th...

AI Technical Summary

Problems solved by technology

[0003] At present, the pre-charging process is only realized by a high-power resistor (that is, the pre-charging resistor), but in the actual application process, once the pre-charging resistor exceeds the design index (such as peak power, pre-charging time, etc.), the pre-charging resistor will easily damaged

After the car's control system is damaged, it is impossible to clearly determine whether it has been damaged because it cannot obtain the current state of the pre-charging resistor.

Therefore, after the pre-charging resistor is damaged, the overall reliability of the system will be reduced due to the loss of the protection function for the instant of starting, which will affect the driving safety to a certain extent.

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