A kind of electric appliance starting protection device for electric vehicle

Abstract

The present invention provides a start-up protection device for electric vehicles, including a start-up circuit and a protection circuit, wherein: the start-up circuit includes an input terminal, a load terminal and a main current-limiting resistor, and the main current-limiting resistor is placed in the Between the input end and the load end; the input end is connected to a power battery, and the load end is connected to a power electrical component; the protection circuit is connected in parallel with the starting circuit; the protection circuit is connected to the control of the electric vehicle system. According to the actual situation, the protection circuit including the damage judgment circuit and the overcurrent feedback circuit can be scientifically and reasonably applied to the electric vehicle, which protects the power electrical system and improves the overall reliability of the electric vehicle.

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...

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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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