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Research on Planar EMI Filter Based on Circular Integrated LC Component

Author: WuLiFang
Tutor: WangShiShan
School: Nanjing University of Aeronautics and Astronautics
Course: Power Electronics and Power Drives
Keywords: EMI filter The ring integrated LC components Transmission line model High-frequency characteristics EPC eliminate
CLC: TN713
Type: Master's thesis
Year: 2011
Downloads: 77
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Abstract


EMI filter is difficult to meet the grade requirements of modern switching power supply equipment power density composed of discrete passive components , integrated research is an urgent need for the existing EMI filter . Therefore, for the current development status LC components , integrated ring as the basic unit of the plane to meet the requirements of modern switching power supply EMI filter integration study . Firstly, compared with the existing integrated LC components of high frequency modeling techniques based on the structural characteristics of the ring integrated LC components , determined based on the transmission line model of the generalized arc transmission line theory to evaluate the high-frequency characteristics . Respectively derivation and the establishment of a two - conductor structure , the mathematical model of multi- conductor structure integration the LC element model of the impedance characteristics as well as the typical filter transmission gain calculation under different connection , and experimental verification of the model correct sex . Analysis of the structural parameters of the ring integrated LC components in high-frequency parasitic parameters ; lumped circuit model for improved filter design is given . Then we discuss planar EMI filter design of the key parameters of the problem . Common mode filter , differential mode capacitance and leakage inductance layer common mode choke as differential mode inductance of the integration methods , and gives the design formula provides a theoretical basis for the integration of EMI filter plane magnetic . Improved planar EMI filter performance , finite element simulation interlaced and cross the transposition winding technology can greatly reduce the EPC , but also increases the thickness of the winding structure , and the need to increase the additional cores and windings to achieve differential mode inductance. In order to eliminate the influence of EPC common mode inductance in the plane between the windings into a grounded copper foil structure capacitance common mode insert copper foil winding between to eliminate common mode inductance EPC . The measurement results show that the grounding copper foil is inserted in an efficient way , the high frequency characteristics can be obtained an ideal inductor . The impact of the comparison and analysis of the the windings parasitic coupling coefficient , insert the structural parameters of the copper foil to eliminate the effect of the EPC . Finally, the simulation comparison of the structure of the three filters into a grounded copper foil , filter common mode and differential mode characteristic significantly improved .

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