Protection device for power battery contactor of electric automobile and control method of protection device

Abstract

The invention discloses a protection device for a power battery contactor of an electric automobile and a control method of the protection device. The protection device comprises a first IGBT (insulated gate bipolar transistor) module, a second IGBT module and an MCU (micro control unit) module, wherein a drain C of the first IGBT module and a source E of the second IGBT module are connected with a circuit between a first contact of the contactor and a positive pole of a power battery pack; a source E of the first IGBT module and a drain C of the second IGBT module are connected with a circuit between a second contact of the contactor and a positive pole input end of a motor driver; a gate G of the first IGBT module, a gate G of the second IGBT module and a control coil of the contactor are connected with a control signal output end of the MCU module respectively. According to the protection device for the power battery contactor of the electric automobile, the highest contact voltage of the contactor during disconnection and connection is clamped to junction voltage of the drains C and the sources E of the IGBT modules, and the problem of high probability of adhesion of the contacts of the DC contactor during large-current disconnection and connection is solved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an electric vehicle power battery contactor protection device and a control method thereof. Background technique [0002] Electric sparks will be generated when the contactor with contacts is switched, which will cause electromagnetic interference to the surrounding environment, cause burning and damage to the contacts of the contactor, and seriously affect the electrical life of the contactor. This is especially true for high-power DC mechanical contactors. In many occasions, the electrical life of high-power DC mechanical contactors is less than one percent of its mechanical life. Therefore, high-power DC mechanical contactors often use various arc-extinguishing technologies. The most advanced and effective The best solution is vacuum plus magnetic blowing technology, but it only alleviates the problem of ignition of contactor contacts, and does not fundamentally solv...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned current state of the art, the present invention provides a power battery contactor protection device for electric vehicles and its control method, which solves the problem that the contacts of the existing contactor are easy to stick when they are cut off and closed due to the unsatisfactory arc extinguishing effect

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