Fault arc detection device for electric car

Abstract

The invention provides a fault arc detection device for an electric car. The fault arc detection device comprises a current transformer, a signal conversion circuit, an amplifying and filtering circuit, an analog-digital converter U306, a digital signal processor U307, a CAN communication transceiver U308 and a serial transceiver U309. The fault arc detection device for the electric car makes up the blank of fault arc detection on a high-voltage DC bus in the electric car industry. Furthermore, as the fault arc detection device can accurately and quickly detect a fault arc and notify a user of the detection result in time, the user or a remote controller can take measures in time, disastrous accidents are avoided, and the safety performance of the electric car is improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle manufacturing, in particular to a fault arc detection device for electric vehicles. Background technique [0002] With the continuous development of power electronics technology, the degree of electrification is getting higher and higher, and circuit protection is becoming more and more important. Many serious electrical accidents are caused by low current arc faults. [0003] Arcing is a phenomenon of gas ion discharge, which is also a kind of plasma. From a microscopic point of view, the current in the arc is the result of the movement of electrons and positive ions under the action of an electric field, and the movement of electrons constitutes the main part of the current. According to the mechanism of arc generation, arcs can be divided into two categories: good arcs (arcs generated when plugging and unplugging electrical appliances, etc.) and bad arcs (fault arcs). Arc faults are...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to solve the current lack of reliable and accurate detection devices for fault arcs on the high-voltage DC bus of electric vehicles, which leads to potential safety hazards in the use of electric vehicles, the present invention provides an electric vehicle. The fault arc detection device uses FFT-based digital filters to analyze the frequency spectrum of the current on the high-voltage DC bus, so as to detect the occurrence of fault arcs in a timely and accurate manner to solve the potential safety hazard of electric vehicles

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