Electric appliance starting protecting device for electric vehicle

A protection device, electric vehicle technology, applied in electric vehicles, electrical devices, vehicle components, etc., can solve problems such as loss of reliability, affecting driving safety, and inability to make clear determinations, so as to improve overall reliability and facilitate fault determination. Effect

CN104149627AActive Publication Date: 2014-11-19BEIJING ELECTRIC VEHICLE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-11-19

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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.
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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...

Examples

Embodiment Construction

[0022] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] Such as figure 1 The shown electrical starting protection device for electric vehicles includes a starting circuit and a protection circuit connected in parallel with the starting circuit, wherein:

[0024] The starting circuit includes input terminal 1, load terminal 2 and the main current limiting resistor placed between the input terminal and the load terminal. The input terminal 1 is connected to a power battery, and the load terminal 2 is connected to power electrical components;

[0025] The protective circuit can have the following three forms:

[0026] The first form of protection circuit is as figure 1 The damage judgment circuit shown in the damage judgment circuit is to connect the damage judgment resistor between the input terminal 1 and the load terminal 2, and the resistance value of the damage...