EMI Prediction Research Articles

Quantitative Analysis and Prediction of EMI From Spread Spectrum of Differential Random Signaling Based on IC Source Modeling

Quantitative Analysis and Prediction of EMI From Spread Spectrum of Differential Random Signaling Based on IC Source Modeling

EMI Prediction and Optimization for Pinmap Design Using Deep Transfer Learning and an Enhanced Genetic Algorithm

EMI Prediction and Optimization for Pinmap Design Using Deep Transfer Learning and an Enhanced Genetic Algorithm

Radiation study on the parallel topology of SiC MOSFET and Si IGBT inverter

The electromagnetic radiation interference mechanism from multiple noise sources on the parallel topology of SiC MOSFET and Si IGBT Inverter is blurred, which will seriously affect the high reliability application of the structure. In order to solve this problem, a topological radiation EMI prediction method is proposed, the method includes the establishment of radiation equivalent models and radiation guidelines, the proposed inverter parallel topology radiation. The modeling method of electromagnetic interference can effectively analyze the influence of radiation interference of SiC and Si devices coupled with each other, and the established PCB radiation near and far field simulation can effectively realize the accurate prediction of radiation interference of inverter parallel topology, and finally the experimental platform of the parallel SiC MOSFET and Si IGBT inverter is built and tested, the test results demonstrate the accuracy of the proposed method.

Wideband Modeling of Power SiC MOSFET Module and Conducted EMI Prediction of MVDC Railway Electrification System

Wideband Modeling of Power SiC MOSFET Module and Conducted EMI Prediction of MVDC Railway Electrification System

EMI Prediction of Multiple Radiators

A new method is developed to predict the scaling of the electromagnetic interference from a large system if similar subsystems are added. The method gives the predicted emission from multiple radiators as well as the level of certainty of the estimation. The proposed statistical approach is based on the phased array antenna theory and Monte Carlo simulation for a router with several line cards (N) and optical modules inserted. To validate the method, a large router with 498 optical modules with an unwanted radiation at 10.31 GHz was investigated in two different cases: the same frequency and different frequency per radiating subsystem. Several statistical experiments were performed for the proposed problem. The effect of phase and amplitude variations over the radiators is reported in this paper. The method is useful when it is not practical to assemble extraordinary amounts of identical hardware in a product installation. The results indicate the existence of a 10 log N (dB) tendency for the maximum electric field emission in a system radiating at the same frequency with random phase distribution over the radiators. For different frequency subsystems, the slope of the maximum electric field emission is lower than the 10 log N (dB) formula.

Enhanced Time-Invariant Linear Model for the EMI Prediction of Switching Circuits

This article presents an innovative technique for the black-box modeling of the conductive emissions of switching circuits from external observations. The proposed methodology relies on the robust and elegant theory of periodically switched linear systems, providing the user with a tool for the generation of frequency-domain augmented linear time-invariant equivalents. The obtained models offer both a remarkable accuracy for different supply conditions and a deep understanding of the inherent switching mechanisms of this class of devices. The proposed framework also enables the derivation of a simplified enhanced Norton representation which outperforms the classical state-of-the-art models based on linear time-invariant approximations. Model parameters are computed via a blind procedure based only on two measurements. The feasibility and strength of the proposed approach are demonstrated on a dc–dc boost power converter and on a dc electrical motor via the prediction of their conducted disturbances.

A High-Frequency and High Spatial Resolution Probe Design for EMI Prediction

In this paper, a simple and accurate equivalent circuit of the magnetic probe is proposed. Based on the equivalent circuit, a high-frequency probe for near-field measurements is proposed, manufactured, and tested. To increase its working frequency, its parasitic inductance and capacitance are reduced by using a small loop aperture and a tapered transition. The working frequency of the probe is up to 30 GHz. At the same time, sidewall metallization and bottom-vias are used in the probe, which result in a good performance of electric field suppression. The transmission section of the probe is optimized at high frequencies by using via fence and coax-thru-hole vias. The magnetic field probe is built on a four-layered printed circuit board with Rogers substrate. The loop aperture size of the probe is $250\,\,\mu \text{m}\,\,\times 250\,\,\mu \text{m}$ , so it has a high spatial resolution and is helpful to measure the detailed magnetic field from a small device. The probe is calibrated by a standard coplanar waveguide with a backside ground (CPWG). Finally, a near-field scanning system with the fabricated probe is set up to test the magnetic field above an unknown CPWG and microstrip line. From the near-field scanning results, it can be concluded that the probe can accurately measure the magnetic field over a wide frequency band.

An ICIM-CI-T Model for EMI Prediction of IO Element on Typical FPGA With Temperature Effect Considered

In this paper, the electromagnetic interference and temperature coupling on MOS transistor is analyzed. The temperature controlled platform that combined with the standardized direct power injection method is designed for experimental measurement. Then the temperature effect on MOS device is considered into the conducted electromagnetic immunity model of input/output element (IOE) for typical field programmable gate array. Meanwhile, the proposed immunity model ICIM-CI-T (integrated circuits immunity model-conducted immunity-temperature), which is based on ICIM-CI, is built to predict the influence of thermal effect on the electromagnetic immunity of IOE. Finally, the validation of the ICIM-CI-T model is verified by experimental measurements, and both simulation and measurement results fit very well at different temperatures. Moreover, it is also observed that temperature exerts different effects on the immunity characteristic of IOE with the change of radio frequency interference frequency.

EMI Prediction and Reduction of Zero-Crossing Noise in Totem-Pole Bridgeless PFC Converters

EMI Prediction and Reduction of Zero-Crossing Noise in Totem-Pole Bridgeless PFC Converters

Conducted EMI prediction using different levels of MOSFET models in a multi-physics optimization context

Conducted EMI prediction using different levels of MOSFET models in a multi-physics optimization context

Common Model EMI Prediction in Motor Drive System for Electric Vehicle Application

Common mode (CM) conducted interference are predicted and compared with experiments in a motor drive system of Electric vehicles in this study. The prediction model considers each part as an equivalent circuit model which is represented by lumped parameters and proposes the parameter extraction method. For the modeling of the inverter, a concentrated and equivalent method is used to process synthetically the CM interference source and the stray capacitance. For the parameter extraction in the power line model, a computation method that combines analytical method and finite element method is used. The modeling of the motor is based on measured date of the impedance and vector fitting technique. It is shown that the parasitic currents and interference voltage in the system can be simulated in the different parts of the prediction model in the conducted frequency range (150 kHz-30 MHz). Experiments have successfully confirmed that the approach is effective.

EMI Prediction Method for SiC Inverter by Developing an Accurate Model of Power Device

EMI Prediction Method for SiC Inverter by Developing an Accurate Model of Power Device

Conducted EMI Prediction of the PFC Converter Including Nonlinear Behavior of Boost Inductor

A conducted EMI prediction model for an interleaved power factor correction (PFC) converter including the nonlinearity of the boost inductors is presented. The Jiles-Atherton (J-A) technique is adopted to handle the nonlinear behavior of the interleaved boost inductors. The conventional conducted EMI prediction model without including the nonlinear effect of the boost inductors tends to underestimate the true conducted EMI level. With the proposed model, conducted EMI can be predicted with higher accuracy so that the correct EMI filter can be designed to meet the required EMI regulatory limits.

Precise methods for conducted EMI modeling, analysis, and prediction

Focusing on the state-of-the-art conducted EMI prediction, this paper presents a noise source lumped circuit modeling and identification method, an EMI modeling method based on multiple slope approximation of switching transitions, and double Fourier integral method modeling PWM conversion units to achieve an accurate modeling of EMI noise source. Meanwhile, a new sensitivity analysis method, a general coupling model for steel ground loops, and a partial element equivalent circuit method are proposed to identify and characterize conducted EMI coupling paths. The EMI noise and propagation modeling provide an accurate prediction of conducted EMI in the entire frequency range (0–10 MHz) with good practicability and generality. Finally a new measurement approach is presented to identify the surface current of large dimensional metal shell. The proposed analytical modeling methodology is verified by experimental results.

Modeling and simulation of unintended electromagnetic emission from digital circuits

AbstractThis paper presents a summary of a quantitative method for evaluating the EMI generation mechanism of a printed circuit board (PCB). First, mismatch of the degree of imbalance of transmission systems on a PCB is pointed out as a common‐mode generation mechanism of high‐speed signal systems. An EMI prediction method based on two‐dimensional analysis is presented along with its results. Next, with regard to the analysis of EMI generation by resonance of the power supply system in a multilayered PCB, a high‐speed simulation by an analytical method and its further extension are described. Finally, a linear macro model (LECCS model) for the device power supply proposed by the author for EMI analysis is presented. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 87(8): 38–46, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.10189

A full-wave model for EMI prediction in planar microstrip circuits excited in the near-field of a short electric dipole

A full-wave model to evaluate the interference induced in planar microstrip lines of arbitrary shape exposed to the near-field of an elementary electric dipole is presented. The analysis of the line response, consisting in the evaluation of the surface current excited along the microstrip line, is based on the electric dyadic Green's function method. The surface current induced on the metal strip which, for the sake of generality, is considered as embedded in the dielectric substrate, is obtained solving by means of the spectral-domain approach (SDA) the electric integral equation, which enforces the boundary condition of zero tangential electric field on the surface of the strip. The induced current is computed for different line geometries and loads, and for various positions (inside or outside the dielectric substrate) and orientations of the dipolar source. Indications towards reducing the level of the signal induced on the loads of the line are inferred.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

EMI Design Prediction and Test Results on VHF Transponder

This paper discusses various aspects of EMI design, prediction and EMI test results obtained on the VHF transponder system, which is a primary unit for predicting the SEO-II satellite range which would be used for updating the satellite orbital parameters. The basic concept of VHF transponder is to employ a method of measuring the range by transmitting the continuous modulated waves and measuring the propagation delay of the transponded signal from the satellite. The range information obtained from the transponded signal is very much valuable and hence it is necessary to ensure that the VHF transponder operates satisfactorily in the satellite environment against EMI. Hence the EMI considerations like design, prediction and test on VHF Transponder are carried out and found to be useful against EMI. The comparison between the EMI prediction and the EMI test observation results is also given.

A Transmitter-Spectrum Synthesis Technique for EMI Prediction

Basic models for the synthesis of transmitter spectra for three different types of transmission have been presented. They are: (1) Amplitude modulation; (2) Conventional radar pulse; and (3) Pulse-compression radar pulse. Each one of the equations defining the models is suitable for pencil-and-slide-rule analysis. In general a great degree of precision is not required in EMI prediction. The graphs given in Appendices II and III indicate that the errors are well within the desired limits.