Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Integrated EMI (electromagnetic interference) filter for optimizing grounded winding layout to improve noise suppression performance

A ground winding and noise suppression technology, which is applied in the field of filters, can solve the problems of poor high-frequency performance and malfunction of filters, and achieve the effects of fewer conductor layers, simple structure, and improved high-frequency suppression capabilities

Inactive Publication Date: 2013-08-07
SOUTH CHINA UNIV OF TECH
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the resonance frequency of each branch and the coupling effect between components, the high-frequency performance of the filter will deteriorate, which is manifested by the reduction of the insertion loss of the filter, and it cannot work normally in the range of 150kHz-30MHz considered by conduction interference.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Integrated EMI (electromagnetic interference) filter for optimizing grounded winding layout to improve noise suppression performance
  • Integrated EMI (electromagnetic interference) filter for optimizing grounded winding layout to improve noise suppression performance
  • Integrated EMI (electromagnetic interference) filter for optimizing grounded winding layout to improve noise suppression performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] figure 1 It is a schematic diagram of the overall structure of a traditional integrated EMI filter, including E-type core 1, the first I-type core 2, the specification is E+PLT38-3E5, and the initial relative permeability is 10000, which is used to increase the differential mode leakage inductance The second I-type magnetic core 3 is made of FPC material and has an initial relative magnetic permeability of 9. It also includes two identical common-mode winding units 4 and 5, which are symmetrical on both sides of the differential-mode second I-type magnetic core. place. Considering that the front section of the entire filter is a left-right symmetrical structure, figure 2 A schematic diagram of a left semi-symmetrical cross-section is given. Among them, the common mode winding units 4 and 5 are divided into five layers, which are the upper common mode inductance conductor layer 6, the low dielectric constant insulating layer 9, the lower common mode inductance conduct...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses integrated EMI (electromagnetic interference) filter for optimizing grounded winding layout to improve noise suppression performance. The integrated EMI filter comprises an E-type magnetic core, a first I-type magnetic core, a second I-type magnetic core and two common-mode winding units of the same structure and symmetrically disposed on the two sides of the second I-type magnetic core. On the basis of the research of the characteristics of component integration and various coupling effects among the components as well as by optimizing the grounded winding layout of the integrated EMI filter, the integrated EMI filter with a small structure, complexity and processing difficulty is capable of effectively eliminating equivalent parallel capacitance of a common-mode inductor. By high-frequency performance comparison of reverse coupling, forward coupling and bidirectional coupling, the conclusion that the bidirectional coupling grounded winding structure can improve high-frequency common-mode noise suppression capacity to the greatest extent is obtained. At the mean time, an equivalent circuit is introduced for the quantitative analysis of a design process, and an accurate field simulation software is used for simulating filtering effects so as to finish the processing and test of the integrated EMI filter.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to an EMI filter with high performance and high integration, which can meet the design requirements of small size, broadband and integrated technology, and can be applied to power electronic systems. Background technique [0002] With the continuous improvement of the operating frequency of power semiconductor devices and the development of power electronic equipment in the direction of high density and miniaturization, the influence of electromagnetic interference caused by it on peripheral equipment has begun to attract much attention. [0003] Traditional filters are implemented using discrete components, however, there are some problems with EMI filters implemented using discrete components. First of all, due to the unavoidable parasitic parameters of discrete passive components, such as the equivalent parallel capacitance (Equivalent Parallel Capacitance, EPC) of the common mod...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H03H9/46
Inventor 黄惠芬叶茂
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com