Developing a common-mode choke coil with high-permeability core used high-speed telecommunications port for UTP cable

Amemiya, Fujio; Takagi, K.; Kuwabara, Nobuo; Hamada, Shota; Iwamoto, Yoshihisa

doi:10.1109/isemc.2002.1032495

Cited by 8 publications

(3 citation statements)

References 1 publication

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“…Ferrite components have been used for reducing or eliminating conducted EMI on printed circuit boards in wiring and cables for decades (Naishadham, 1999; Mardiguian, 2000; Keenan, 2003; Amemiya et al , 2002; Kumar, 1999).…”

Section: Ferrite Emi Suppressorsmentioning

confidence: 99%

Comparison of different structures of ferrite EMI suppressors

Damnjanović

Stojanović

Živanov

et al. 2006

Microelectronics International

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PurposePresent 3D electromagnetic simulators have high accuracy, but they are time and memory expensive. Because of that, fast and simple expression for impedance is also necessary for initial inductor design. In this paper new efficient method for total impedance calculation of ferrite electromagnetic interference (EMI) suppressor is given. By using an algorithm, it is possible to predict correctly all variations of electrical characteristics introduced by varying geometry parameters of EMI suppressor.Design/methodology/approachThe starting point for calculation of electrical characteristics of EMI suppressor is Greenhouse theory. Greenhouse decomposed inductor into its constituent segments. Basically, all segments of conductive layer are divided into parallel filaments having small, rectangular cross sections. The self‐ and mutual‐inductance were calculated using the concept of partial inductance. Total impedance of EMI suppressor is calculated taking care of dimension of chip size, material that are used and geometry of conductive layer.FindingsThe Simulator for Planar Inductive Structures (SPIS™) simulates effects of ferrite materials and geometrical parameters of planar inductive structures. With proposed software tool, designers can predict performance parameters quickly and easily before costly prototypes are built. SPIS™ software offers substantially reduced time to market, and increases device performance. The computed impedances, given by our software tool are compared with measured data and very good agreement was found.Practical implicationsApplied flexible efficient methods for impedance calculation of EMI suppressor are able to significantly increase the speed design of multilayer suppressors for universal series bus, low‐voltage differential signaling and in other high‐speed digital interfaces incorporated in notebooks and personal computers, digital cameras and scanners. Also, ferrite suppressors have been successfully employed for attenuating EMI in switching power supplies, electronic ignition systems, garage door openers, etc.Originality/valueThe paper presents realized structures of ferrite EMI suppressors. New geometries of conductive layer are proposed. In addition, using simple model of inductor, the paper develops a CAD simulation tool SPIS™ for calculation of electrical characteristics of EMI suppressors with different geometry of conductive layer.

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Section: Ferrite Emi Suppressorsmentioning

confidence: 99%

Comparison of different structures of ferrite EMI suppressors

Damnjanović

Stojanović

Živanov

et al. 2006

Microelectronics International

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“…Previously published research in this field has disclosed a wealth of information regarding how to design this kind of filter [1][2][3][4][5]. This information, however, is not normally encountered in the classroom by electrical engineering students, and can appear to be difficult to understand at first glance.…”

mentioning

confidence: 97%

Modelling the performance of ferrite based common-mode filters: an educational approach using spice and mathcad

Norte

2013

2013 IEEE International Symposium on Electromagnetic Compatibility

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It is well known in the industry that ferrite-based common mode filters can produce mitigation of common mode noise. Previously published research in this field has disclosed a wealth of information regarding how to design this kind of filter [1][2][3][4][5]. This information, however, is not normally encountered in the classroom by electrical engineering students, and can appear to be difficult to understand at first glance. This paper discusses the process of designing large common mode ferrite-based filters that are also based upon a cylindrical geometry, and that can be readily understood by students through the use of easily available tools such as SPICE and Mathcad®. Concepts such as lossy ferrite materials, magnetic field illumination patterns, leakage flux, inductance, Ampere's Law, 3dB bandwidths, crosstalk, and other relevant concepts that relate to the design of such filters, are important to obtaining a firm understanding of this class of filters. After such a filter is designed, the common mode and differential mode attenuation performances need to be obtained from the filter. From this information, it can then be determined if the filter meets the requirements. This paper presents results from a Mathcad based numerical model that was derived by the author, and that can be used in an educational program for designing these kinds of common-mode filters. The model first extracts the inductance for one differential pair of conductors that are passed through a large toroid that is comprised of Manganese-Zinc. These results include the following cases: (1) small leakage inductance, (2) medium leakage inductance, and (3) large leakage inductance. From these results, it can be determined that leakage inductance can be used as a means of providing some mitigation against common mode noise, while also increasing the differential 3dB bandwidth of the filter. These results are then extended to more realistic cases such as the inclusion of several differential pairs of conductors, which is similar to the case of a CAT 5 cable that is used for Ethernet applications, or a cable that is used to carry multiple low-frequency differential telephony signals, such as the class of T1 or E1 trunk signals.Finally, the crosstalk performance of such filters is addressed.

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“…Common-mode choke coils are effective for improving the conductive immunity of telecommunication equipment, and many kinds of choke coils have been developed [3], [4]. However, choke coils are costly to use after the equipment has been installed because an engineer must visit the installation location.…”

Section: ⅰ Introductionmentioning

confidence: 99%

Investigation of Relation between EFTB Test and RF Conductive Immunity Test Using BER and Baseband Signal

Kuwabara¹,

Irie²,

Hirasawa³

et al. 2011

Journal of electromagnetic engineering and science

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High-speed telecommunication systems are influenced by electromagnetic environments because they need a wide bandwidth to transmit signals. Immunity tests of telecommunication equipment are effective for improving its immunity to electromagnetic environments. However, immunity tests are expensive to carry out because there are several different tests. The correlation among the tests should therefore be examined in order to reduce the kinds of tests that are necessary. This paper investigates the correlation between the electrical fast transient/burst (EFTB) test and the radio frequency (RF) conductive immunity test. Imitation equipment was constructed with a balun, and a baseband signal was transmitted from the associated equipment to the imitation equipment. Then, disturbances were applied to the equipment, and the telecommunication quality was evaluated by using the bit error rate (BER). The results from the EFTB test indicated that the BER was less than 6×10-5 and the value was independent of the peak value. The results from the RF conductive immunity test indicated that the BER was affected by the longitudinal conversion loss (LCL).

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Developing a common-mode choke coil with high-permeability core used high-speed telecommunications port for UTP cable

Cited by 8 publications

References 1 publication

Comparison of different structures of ferrite EMI suppressors

Comparison of different structures of ferrite EMI suppressors

Modelling the performance of ferrite based common-mode filters: an educational approach using spice and mathcad

Investigation of Relation between EFTB Test and RF Conductive Immunity Test Using BER and Baseband Signal

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