Integrated EMI filter for electric vehicle motor controller

Abstract

The invention discloses an integrated EMI filter for an electric vehicle motor controller. The integrated EMI filter is characterized by comprising a positive pole bus, a negative pole bus, magnetic rings, a differential mode capacitor, a common mode capacitor, an insulating plate, a mounting base, a cover plate and potting epoxy resin; the positive pole bus and the negative pole bus are combinedwith the insulating plate, namely both electrical isolation and installation limiting are carried out; an EMC capacitor is fixed in a direct current bus installation hole through tin soldering; the inductance of an EMC capacitor lead is reduced to the minimum; after the runway-shaped magnetic ring penetrates through the combination of the positive pole bus, the negative pole bus and the insulatingplate, the runway-shaped magnetic ring is fixed, limited and insulated through the cover plate; the EMC capacitor is directly welded on the positive pole bus, the negative pole bus or sub-bars, and meanwhile, multi-point grounding is adopted, so that the length of a grounding wire can be reduced to the greatest extent, stray inductance is controlled, and a better EMI filtering effect is achieved;a front-end filter circuit and a rear-end filter circuit are designed in an integrated mode, so that product standardization and modularization are achieved.

Description

technical field [0001] The invention relates to the technical field of EMI, in particular to an integrated EMI filter for an electric vehicle motor controller. Background technique [0002] Electric vehicle motor controllers and complete vehicles must meet the national mandatory standards (GB / T 18387-2008 and GB14023-2011). At present, OEMs and component factories are designing and developing related EMI filter products. There are mainly two technologies Solution, the first is to integrate the EMI circuit in the DC-Link (DC support) capacitor, but currently limited by space and circuit topology, generally only one level of common-mode filter capacitors and differential-mode filter capacitors can be integrated; the second It uses a dedicated EMI filter, but the existing EMI filter uses a switching filter circuit topology for switching power supplies, which is suitable for grid-side filtering and cannot filter out intermediate frequency noise. To meet the standards, a multi-st...

AI Technical Summary

Problems solved by technology

[0002] Electric vehicle motor controllers and complete vehicles must meet the national mandatory standards (GB / T 18387-2008 and GB14023-2011). At present, OEMs and component factories are designing and developing related EMI filter products. There are mainly two technologies Solution, the first is to integrate the EMI circuit in the DC-Link (DC support) capacitor, but currently limited by space and circuit topology, generally only one level of common-mode filter capacitors and differential-mode filter capacitors can be integrated; the second It uses a dedicated EMI filter, but the existing EMI filter uses a switching filter circuit topology from a switching power supply, which is suitable for grid-side filtering and cannot filter out intermediate frequency noise. To meet the standard, a multi-stage filter circuit is required

However, multi-stage filtering will also cause new problems, such as long grounding length and chaotic wiring, which will bring new interference noise. In addition, the existing EMI filter package is complicated, which is not conducive to modular assembly

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