Improvements to a Method for Estimating the Maximum Radiated Emissions From PCBs With Cables

Su, Changyi; Hubing, T.H.

doi:10.1109/temc.2011.2165217

Cited by 9 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Common-mode currents as low as 5 μA induced on a 1-m cable can result in radiated fields that exceed the FCC Class B limit. The physics of this coupling was first described and quantified in [9,10], and refinements to the original model I/O coupling EMI calculator have been developed over the years [14,16,17,19,21]. Electric-field (or voltage-driven) coupling is illustrated in Fig.…”

Section: Common-mode Currents Induced On Cables Attached To the Boardmentioning

confidence: 99%

“…Equations for determining the amplitude of an equivalent common-mode voltage source that drives the cable are derived in [14,19]. Equations for deriving the maximum possible radiated emissions from a board-cable structure driven by a common-mode voltage source are derived and validated in [17,21].…”

Section: Common-mode Currents Induced On Cables Attached To the Boardmentioning

confidence: 99%

“…The algorithms implementing the equations derived in [19,21] were incorporated in the MREMC calculator. Fig.…”

Section: Common-mode Currents Induced On Cables Attached To the Boardmentioning

confidence: 99%

See 2 more Smart Citations

Performance-Based EMC Design Using a Maximum Radiated Emissions Calculator

Hubing¹

2013

Journal of electromagnetic engineering and science

Self Cite

View full text Add to dashboard Cite

Meeting electromagnetic compatibility (EMC) requirements can be a significant challenge for engineers designing today's electronic devices. Traditional approaches rely heavily on EMC design rules. Unfortunately, these design rules aren't based on the specific EMC requirements for a particular device, and they don't usually take into account the specific function of the circuits or the many design details that will ultimately determine whether the device is compliant. This paper describes a design methodology that relates design decisions to the product's EMC requirements. The goal of performance-based EMC design is to ensure that electronic designs meet EMC requirements the first time the product is tested. More work needs to be done before this concept reaches its full potential, but electronic system designers can already derive significant benefit by applying this approach to products currently under development.

show abstract

Section: Common-mode Currents Induced On Cables Attached To the Boardmentioning

confidence: 99%

Section: Common-mode Currents Induced On Cables Attached To the Boardmentioning

confidence: 99%

See 1 more Smart Citation

Performance-Based EMC Design Using a Maximum Radiated Emissions Calculator

Hubing¹

2013

Journal of electromagnetic engineering and science

Self Cite

View full text Add to dashboard Cite

show abstract

“…There have been several studies on this problem. Some of them [8], [9], [10], [11], [12], [13] utilize a model comprising a simple dipole or monopole antenna driven by a single voltage source that represents the noise source on the PCB. However, these studies assume that the input impedance is purely real and not frequency dependent.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Radiated Emissions From a Fuel Cell Power Converter by Measuring the Common-Mode Current in the Attached Cable

2023

View full text Add to dashboard Cite

Being able to predict radiated emissions before using an accredited laboratory can be both time-effective and cost-effective. This study presents a model for predicting radiated emissions from power converters by measuring the common-mode current in the attached cable. When power converters are tested for radiated emissions, in semi-anechoic chambers, the attached cables tend to be thick because of the high currents they carry. Ideally, these cables leave the chamber through connectors in an opening positioned precisely at the middle of the bottom of the turntable in keeping with CISPR 32. However, the turntable-connectors are typically not intended for currents higher than 16 A. Consequently, such cables are usually inserted through the side wall of the chamber and are therefore laid horizontally on the chamber floor. When the turntable is to be rotated with a device on it during a test, the length of the cable attached to the device can exceed 10 meters. The proposed model in this study is based on the transmission line model of a cable loaded with reactive impedance and the assumption that the current distribution along the cable follows a sinusoidal distribution law, much like in dipole antenna theory. The analytic equation of the radiation pattern is derived, and a simplified approximation equation is also presented. The proposed model also works with short, attached cables and is thus universal. The Maxima software code for automated calculation of the radiated field from measurement data is supplied as supplemental material. The proposed model was experimentally validated by running the fuel cell converter module at 5 kW output power.INDEX TERMS CM current, EMC, EMI prediction, power converters, radiated emissions.

show abstract

“…Analytically, a closed‐form expression is developed in [5] to estimate the maximum CM RE from a PCB with one attached cable. However, this expression cannot detect the resonant peak positions for various board and cable geometries.…”

Section: Introductionmentioning

confidence: 99%

Prediction of common‐mode radiation from cables attached to PCB using imbalance difference and asymmetrical dipole antenna models

Sayegh

Jenu

2016

Electron. lett.

View full text Add to dashboard Cite

Cables attached to a PCB can produce a significant amount of unintentional common-mode (CM) radiated emissions (REs). Therefore, it is important to predict these emissions at the design stage before the first prototype is fabricated to ensure time and cost savings. In this Letter, a novel method was proposed to estimate the CM RE from two cables attached to a PCB using the imbalance difference model and asymmetrical dipole antenna model. The proposed method consists of two steps: first, the induced CM voltages on the junctions between the cables and PCB are computed using the imbalance difference model; secondly, the CM REs are then estimated separately for each cable related to half of the ground plane using the asymmetrical dipole antenna model. The overall REs are then computed by the superposition of the RE from the two asymmetrical dipoles. The effectiveness of the proposed method has been verified by comparing the predicted results to both 3D high-frequency structure simulator simulation results and measurement results taken in a semi-anechoic chamber. A good agreement with the accuracy of more than 95% is observed for the upper bounds of the measured REs.Introduction: Cables attached to a PCB are well-known sources of the unintentional common-mode (CM) radiated emission (RE) [1]. These CM emissions can be evaluated by the measurement of CM current as performed in [2]. However, this method is time consuming since the CM current depends on the frequency and the position of the current probe along the cable.Alternatively, CM RE can be computed using full-wave numerical solvers. However, this method also involves intensive computational resources, especially if the attached cables are long. Therefore, a fast and accurate analytical method is necessary to estimate the CM RE. Watanabe et al.[3] have proposed a model to estimate a CM RE based on current division factor. According to this model, the CM voltage sources are located at the junctions between the cables and the PCB ground plane where the change in the imbalance occurs. Although the derived CM equivalent structures based on the imbalance difference model provide accurate results for CM RE [4], these emissions are estimated by simulating the equivalent structure using a 3D high-frequency structure simulator (HFSS) simulation.Analytically, a closed-form expression is developed in [5] to estimate the maximum CM RE from a PCB with one attached cable. However, this expression cannot detect the resonant peak positions for various board and cable geometries. Zhang et al. [6] have proposed an analytical method for estimating the CM RE using the imbalance difference model and asymmetrical dipole antenna. However, this method has been applied to the PCB with only one attached cable. In this Letter, a novel method is proposed to predict the CM RE from two cables attached to two ends of the PCB using the imbalance difference model and asymmetrical dipole antenna model. It can be described in two steps: computing the CM voltages on the junctions between the PCB and...

show abstract

Improvements to a Method for Estimating the Maximum Radiated Emissions From PCBs With Cables

Cited by 9 publications

References 5 publications

Performance-Based EMC Design Using a Maximum Radiated Emissions Calculator

Performance-Based EMC Design Using a Maximum Radiated Emissions Calculator

Prediction of Radiated Emissions From a Fuel Cell Power Converter by Measuring the Common-Mode Current in the Attached Cable

Prediction of common‐mode radiation from cables attached to PCB using imbalance difference and asymmetrical dipole antenna models

Contact Info

Product

Resources

About