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The Design of Passive Planar Integrated EMI Filter Consisted of Integrated LC Structure

Author: ZhouXiaoLin
Tutor: WangShiShan
School: Nanjing University of Aeronautics and Astronautics
Course: Power Electronics and Power Drives
Keywords: Planar integrated Integrated LC structure EMI filter Insertion Loss Pot core Differential mode interference Common mode interference
CLC: TN713
Type: Master's thesis
Year: 2011
Downloads: 83
Quote: 1
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Abstract


Passive EMI filter to suppress conducted EMI in switching power supply , while the traditional filter is composed of discrete inductors and capacitors , due to the large number of discrete components , shapes , space utilization is low, the total converter large part of the volume of the system , and the existence of discrete components parasitic severely affected by the high frequency performance of the filter . Accordingly, it is very necessary to reduce the volume of the EMI filter to improve its high-frequency performance , to carry out the study of the planar integrated EMI filter . The integrated LC structure to achieve the integration of magnetic and capacitive elements is the basic unit constituting the planar integrated EMI filter . This paper analyzes the basic principles of electromagnetic integrated by analyzing the different structure of the distribution of the electric and magnetic fields to determine the basic electromagnetic integrated structure , and gives the simplified model . A generalized transmission line theory, established on the basis of the lumped parameter model of the integrated LC structure , and calculate the electromagnetic parameters of the model unit length . Will be integrated LC structure as a two-port network , the use of the the modulus transformation method has been the port impedance matrix . Analysis of the shortcomings of the existing rectangular integrated LC structure , and its structure has been optimized , were compared before and after optimization of the flux density of the two structures and impedance characteristics . This paper focuses on the implementation and design of integrated LC structure based on circular planar integrated EMI filter . Consider the non-linearity of the core permeability and turns parasitic capacitance the ring integrated LC lumped parameter model , based on the node voltage method to get the filter insertion loss , and the accuracy of the model is verified by experiments . Last discussed in detail the the ring integrated LC structure of the planar integrated EMI filter design process of integration parameter approximation formula used to guide the filter design . A flat-screen integrated EMI filter , were compared with the discrete filter .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Filtering techniques,the filter
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