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EMI (Electro-Magnetic Interference) filter capable of inhibiting conducted emission and radiated emission

A technology of radiated emission and conducted emission

Active Publication Date: 2015-03-11
成都必控科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing EMI filter technology can only suppress conducted emission (conducted emission, referred to as CE), but cannot overcome radiated emission (referred to as RE).

Method used

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  • EMI (Electro-Magnetic Interference) filter capable of inhibiting conducted emission and radiated emission

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Embodiment Construction

[0009] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. Such as figure 1 As shown, the structure of the present invention is a double-cavity shielding structure, and the circuit part is composed of a conduction emission part filter arranged in one cavity and a radiation emission part filter arranged in another cavity; the conduction emission part filter Similar to the current traditional EMI filter, it mainly suppresses electromagnetic interference in the 10kHz-30MHz frequency band; the radiation emission part filter is composed of a connector 1, an X2Y capacitor mounting plate 2, an upper magnetic bead 3, a lower magnetic bead 4, an upper feed A π-type filter circuit composed of a pass-through capacitor 5 and a feed-through capacitor 6, etc., the connector 1 and the X2Y capacitor mounting board 2 constitute a filter connector, the X2Y capacitor mounting board 2 is installed with an X2Y capacitor, and the ou...

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Abstract

The invention discloses an EMI (Electro-Magnetic Interference) filter capable of inhibiting conducted emission and radiated emission, which is of a dual-cavity shielding structure, wherein a circuit part comprises a conducted emission part filter arranged in one cavity and a radiated emission part filter arranged in the other cavity; the radiated emission part filter is a pi filter circuit consisting of a connector, an X2Y capacitor installation board, an upper magnetic ball, a lower magnetic ball, an upper feed through capacitor and a lower feed through capacitor, the connector and the X2Y capacitor installation board form a filter connector, the output line of the connector is respectively connected with the upper magnetic ball and the lower magnetic ball, the upper magnetic ball and the lower magnetic ball are respectively connected with the upper feed through capacitor and the lower feed through capacitor; and the conducted emission part filter and the radiated emission part filer are mutually connected through the upper feed through capacitor and the lower feed through capacitor. The invention has the advantages of capability of simultaneously inhibiting international technical difficulties of conducted emission and radiated emission, and stronger practical value and practical significance.

Description

technical field [0001] The invention relates to an EMI filter capable of suppressing conduction emission and radiation emission, and belongs to the technical field of electromagnetic compatibility. Background technique [0002] Electromagnetic interference (EMI) refers to any electromagnetic energy that can interrupt, hinder, reduce or limit communication equipment. The propagation of EMI can be conducted through radiation (electromagnetic waves in free space) and power systems and signal lines. The EMI conduction of power systems has Two modes, the common mode (asymmetric) conduction path is the current between the line and neutral conductors and the reference ground or ground, and the differential mode (symmetric) conduction path is the voltage between the line and neutral conductors. At present, there are two reasons why designers and manufacturers of electronic equipment pay great attention to electromagnetic compatibility: one is based on the requirement that the equipm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/46
Inventor 区健昌盛杰
Owner 成都必控科技有限责任公司
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