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Alternating current and direct current coupling integrated EMI filter for motor driving system

A motor drive system, AC and DC technology, applied in the direction of inductors, control systems, electric vehicles, etc., to achieve the effect of reducing the total volume, reducing the number, and improving space utilization

Active Publication Date: 2020-07-24
XIDIAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The motor controller uses the EMI filter to realize the function of suppressing the electromagnetic interference of the DC bus and the AC phase line at the same time, but its integration method is simply to place the two filters on the DC bus and the AC phase line in parallel in a large In the cavity, the total volume of the two filters is not effectively reduced, but the installation layout and connection method are optimized

Method used

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  • Alternating current and direct current coupling integrated EMI filter for motor driving system
  • Alternating current and direct current coupling integrated EMI filter for motor driving system
  • Alternating current and direct current coupling integrated EMI filter for motor driving system

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] refer to figure 1 , the present invention includes a metal case 1 , a common mode inductor 2 , a capacitor PCB board 3 , a first dielectric board 4 and a second dielectric board 5 .

[0027] The metal shell 1 is composed of side plates on both sides, base and square sleeve sheet metal parts. The assembly method is connected by multiple bolts. After considering the cost, mechanical strength and shielding effectiveness, stainless steel is selected as the material for making the metal shell. .

[0028] The common mode inductor 2 as figure 2As shown, including core set and five windings. Described magnetic core group comprises two layers of nanocrystalline magnetic ring groups 21 stacked on each other, and each layer of nanocrystalline magnetic ring groups 21 is made of at least two nanocrystalline magnetic rings arranged in pa...

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Abstract

The invention provides an alternating-current and direct-current coupling integrated EMI filter for a motor driving system. The filter comprises a metal shell (1), a common-mode inductor (2) and a capacitor PCB (3), and is supported, mounted and insulated through a first dielectric plate (4) and a second dielectric plate (5). The common-mode inductor (2) comprises two layers of nanocrystalline magnetic ring groups (21), a horizontal winding printing plate (22) and a vertical winding copper bar (23) which form five windings of the common-mode inductor (2) together. Compared with the prior art,by using the filter of the invention, two common-mode inductor windings connected in series in a single-phase positive bus and a single-phase negative bus and three common-mode inductor windings connected in series in a three-phase alternating-current phase line are encircled on the same magnetic core group so that coupling of the alternating-current inductor and the direct-current inductor is realized, and two common-mode inductors in the prior art are integrated into one magnetic element in a magnetic integration manner; and the number of elements in the EMI filter is reduced, and miniaturization of the EMI filter is realized.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an AC-DC coupled integrated EMI filter, which is suitable for a motor drive system of an electric vehicle. Background technique [0002] The motor drive system of an electric vehicle is composed of a DC power supply, an inverter and a three-phase motor. When the inverter is in normal operation, the switching device will be turned on and off quickly to form a very high-amplitude steep pulse, resulting in electromagnetic The interference frequency is wide and the energy is large, and it is the main source of interference in the car. If the noise generated by the inverter is not suppressed, its common mode noise will be transmitted to different sensitive equipment along the single-phase DC bus and three-phase AC phase lines of the electric drive system: common mode noise will be conducted along the DC bus To the inside of the DC power supply, it will cause dam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/50H01F17/00H01F27/24H01F27/28
CPCH02P29/50H01F17/0006H01F27/24H01F27/2804H01F2027/2809Y02T10/72
Inventor 郑峰王安宇赵晓凡
Owner XIDIAN UNIV
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