Advanced Technology of Electrical Engineering and Energy EMI PCB

Transcription

1 Advanced Technology of Electrical Engineering and Energy Vol. 30No. 2 April 20 EMI LC 2006 EMI EMI LC 2D 3D PCB LC LC TN73. 4 A EMI EMI 2 LC L L 2 - M - C C 2 - C p C p2 - R R 2 - LC LC Fig. Structure and equivalent circuit of integrated LC component 3 EMI 6 LC 7 2D LC EMI LC 2D 3D

2 36 30 LC 2D LC 2 2D 3D /2 2 x LC 2 LC / r 2. LC 2 φ + 2 φ = 0 2 n - x 2 y 2 0 k 0 φ j S0 = 0 0 C k0 i j φ j S i = 5 C ij φ i = φ j Q i U ij φ y = 0 x Q = C 0 U 0 + C 2 U 2 C k U k C n - U n - 4 C ij0 C ij0 l N N + Q k = C k U k + C k2 U k2 C k0 U k0 C N N + C k n - U k n - C N N + = C ij0 l N N + l N N + = 2w in + l in + 8w + 8n - w + d Q n - = C n - U n - C n - k U n - k 6 l in w in 4 C n - 0 U n U 0 = 0U = U 2 = U n - = 2 U k0 = U ij = 0 kij = 2 3 n Fig. 2 FE model of parallel plane field C 0 = Q C 20 = Q 2 C 4n - 0 = Q n N N 0 ~ n - 4 LC LC 2D 3D PCB z 4 2 φ x φ y φ z 2 = 0 7

3 2 EMI LC 37 Fig. 5 5 N Circuit model of N-turn planar winding 3 LC 3D 3 LC Fig. 3 3D FE model for integrated LC component 3. 4 LC C N N + 6 l in = 27. 9mm 920 % mm a ' 22' ' 2' C C C 2 Fig. 6 Cross-sectional view of prototype and main parameters 4 c 2D 3D 2 4 b 4 c N 4 b 5 N % 2 C p LC C p = 0. 5 Tab. Calculated results of inter-turn capacitance + C 2 C 2 + C 2 3 C N -2 N C N - N C N - N 8 C N N + / pf 2D FEM 3D FEM C C C C C C C p / pf Tab. 2 2 Relationship of inter-turn capacitance to permittivity Fig. 4 4 Model of 2-turn planar winding structure / pf / pf

4 LC Fig. 8 Comparison of calculation and measurement z LC z l in 2D 3D w in 7 4 EMI LC 2D 3D LC LC 0% LC 7 2D 3D 2 LC Fig. 7 Comparison of partial capacitance 00 using 2D & 3D FEM % References w in 2D 3D 2D 3D Wang ZhaoanYang XuWang Xiaobao. w in State-of-art and development trends of power electronics LC integration technology J. Power Electrics D 3D 2 Zhou XiaolinWang Shishan 3. 3 Cui Yongsheng. LC HP4395A Impedance characteristics of LC unit for plane integrated 8 filter J. Adv. Tech. of Elec. L 2C p Eng. & Energy ~ 30MHz 3 Dong JiqingChen Wei. PFC Research on effect of stray capacitance of magnetics components on CM EMI in interleaving PFC J. Adv. 0% 2D Tech. of Elec. Eng. &Energy Cui YongshengWang ShishanZhou Xiaolinet al.. 3D LC Cancellation of parasitic inductance for filter capacitor with planar windings J.

5 2 EMI LC 39 Adv. Tech. of Elec. Eng. & Energy S GevorgianH Berg. Line capacitance and impedance of coplanar-strip waveguides on substrates with multiple dielectric layersa. Microwave ConferenceC. London UK Rengang Chen. Integrated EMI filters for switch mode power suppliesd. USAVirginia Polytechnic Institute and State University Qin YuThomas W Holmens. A study on stray capacitance modeling of inductors by using the finite element method J. IEEE Trans. on Electromagnetic Capability Wang ShishanCui YongshenXie Shaojun. Extraction of parasitic capacitance for toroidal ferrite core inductor J. Trans. China Electrotechnical Society Extraction of parasitic capacitance of integrated LC component for planar EMI filter WU Li-fangWANG Shi-shanZHOU Xiao-lin Nanjing University of Aeronautics and AstronauticNanjing 2006China AbstractAiming at predicting and analyzing the high frequency performance of EMI filter efficiently the effect of parasitic capacitance of planar inductor must be considered. In this paper the 2D and 3D electrostatic FE model of the integrated LC component for planar EMI filter is firstly presented respectivelythrough calculating the parasitic capacitance among the windingsthe lumped circuit model for N-turns planar winding consisted of PCB inductor is derivedthen the equivalent parallel capacitor of planar winding could be given out. By analyzing the effects of permittivity and fringing effect on parasitic capacitance the calculated result is to be verified by comparison with measurement. The method of extraction for parasitic capacitance can be used to design the planar winding and the integrated LC structure. Key wordsintegrated LC componentparasitic capacitancefe modelplanar winding 櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆 7 cont. from p. 7 Small signal modeling of active clamp forward converter with magnetic integration CHEN WeiLU Zeng-yi College of Electrical Engineering and Automation of Fuzhou UniversityFuzhou 35008China AbstractIntegration of transformer and the output inductor can effectively reduce the output current ripple and improve the output quality in forward converter. On purpose of the systematic investigationa general method to build small signal model is proposed. The control to output transfer function of active clamp forward converter with magnetic integration is emphasized. In terms of the windings' coupling between transformer and the output inductor the dynamic zeroes and poles are additionally introduced. Moreoverthe right half plane zero emerges in condition of zero output current ripple. Key wordsmagnetic integrationsmall signal modelingright half plane zerozero ripple