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Intelligent universal common-mode EMI filter

A filter, general-purpose technology, applied in the field of power electronics, can solve problems such as low versatility, and achieve the effect of miniaturization and volume reduction

Active Publication Date: 2021-05-28
西安智源导通电子科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects in the above-mentioned prior art, and propose an intelligent general-purpose common-mode EMI filter, which is used to solve the technical problems of low versatility existing in the prior art

Method used

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  • Intelligent universal common-mode EMI filter

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] refer to figure 1 , the present invention includes a common mode inductor 1, a PCB board 2, a dynamic detection modulator 3 loaded on the PCB board 2 and a shell.

[0031] The common mode inductor 1 has a structure such as figure 2 As shown, it includes a ring magnetic core 11 , two common mode windings 12 with opposite winding directions and a detection winding 13 . Described annular magnetic core 11 can use annular magnetic core and run to annular magnetic core, and this specific embodiment uses annular magnetic core, and its cross-sectional area S is 96.25mm 2 , the inner diameter is 17.6mm, and the outer diameter is 33mm. In order to ensure its filtering performance and anti-saturation ability, the magnetic core is made of nanocrystalline material with an initial permeability of 70,000 and a saturated magnetic induction ...

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Abstract

The invention provides an intelligent universal common-mode EMI filter, which comprises a common-mode inductor (1), a PCB (2) and a detection modulator (3) loaded on the PCB (2), wherein the common-mode inductor (1) comprises an annular magnetic core (11), two common-mode windings (12) with opposite winding directions and a detection winding (13), and the detection modulator (3) comprises an integrating circuit (31) and a digital processing module (32). According to the invention, the detection winding is additionally arranged on the common-mode inductor magnetic core of the common-mode EMI filter, and a set of dynamic detection modulation device capable of detecting the saturation condition of the common-mode inductor and realizing automatic modulation is connected into the common-mode EMI filter, so that the common-mode EMI filter can be intelligently and dynamically adjusted according to the specific conditions of the systems when being connected into different systems, the common-mode EMI filter can normally and safely work in various power converter systems, and the universality of the common-mode EMI filter is realized through intelligentization.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a common-mode EMI filter, in particular to an intelligent general-purpose common-mode EMI filter suitable for power converter systems of motor drives and photovoltaic power stations. Background technique [0002] Wide and tight-band semiconductor switching devices are widely used in motor drive systems and power converter systems of photovoltaic power plants. Compared with traditional silicon devices, these devices have higher switching frequency and turn-on rate, and will form steep pulses with larger amplitudes. , which will generate broadband and high-amplitude electromagnetic noise, and the common-mode noise will flow into sensitive equipment such as power supply and load along the bus. If this part of the noise is not suppressed, the high-frequency energy contained in the common-mode noise will cause damage to the battery pack, and it will also emit radiation to affec...

Claims

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Application Information

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IPC IPC(8): H02M1/44H02M1/12
CPCH02M1/44H02M1/12Y02E40/40
Inventor 郑峰何谷青王安宇祖毅
Owner 西安智源导通电子科技有限公司