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In this paper, a new radiation prediction method based on partial element equivalent circuit (PEEC) is proposed. Unlike complex inductance and capacitance used in PEEC, the proposed method utilizes real inductance and capacitance to predict the relative current distribution and then determine the radiation resistance by the integration of Poynting vector. With the proposed circuit model, scattering...
To assess the susceptibility of device under electromagnetic pulse (EMP) environment, simulation test is believed as an effective method. But during simulation tests, few data can be obtained to assess effect. This paper presents an effect threshold model of a communication device based on Bayesian method. The model parameters are optimized by Markov Chain Monte Carlo (MCMC) algorithm.
The characteristics of electromagnetic (EM) waves propagating through the space between overlapped metal (conductive) plates and electrically conductive parts, which usually exists around a metal shielded box, are discussed in this study. The authors estimated that the space between overlapped metal plates and electrically conductive parts is frequently expected to be extremely thin for the width...
The characteristics of electromagnetic (EM) waves propagating through the space between overlapped metal (conductive) plates and electrically conductive parts, which usually exists around a metal shielded box, are discussed in this study. The authors developed a method for measuring the current density distribution on the interface between the overlapped and energized metal plates. Using this method,...
Bidirectional wireless power transfer (BWPT) is a research focus which can achieve the interaction between the grid and the electric vehicles. This paper builds the mathematical models of BWPT with the H-bridge converters (HBCs) in the grid side as well as in the vehicle side. Two control methods are compared, namely CASE 1: changing the phase-shifting angle of the two legs of the transmitter HBC...
This paper systematically discusses fabrication process, morphological observation and electromagnetic noise suppression performance of new series of the non-woven fabric type noise suppressor consisting only of the meltblown thin fibers. Effect of contact resistance has been clarified experimentally for the first time as the sheet resistance becomes the less and accordingly the loss ration becomes...
Designing a noncontact measurement probe can reduce costs. But this probe may be two questions, the first question is how to correctly received the signal, because, unlike non-contact probe contact probe signals can be passed through the probe correctly, the second question is how to reduce signal attenuation in the probe passes, because non-contact probe signal is received via an antenna, the signal...
This paper presents a Partial Element Equivalent Circuit (PEEC) based simulation tool, called TAES for simulating transients in a wire system. The enhancement in the traditional PEEC model with the vector fitting method is provided in order to achieve a time domain simulation for frequency-dependent conductors. A system with steel bars, cables and arrestors is studied and results of experimental verification...
Wireless power transfer (WPT) technology are hot topic in current researches in SMPS. This paper focuses on the structure of magnetic coupling system, which regarded as the most significant part in WPT system. A new magnetic structure with good position robust and low flux leakage to nearby space was proposed comparing to the traditional spiral structure. The simulation results, magnetic evaluation...
In this work, based on the mode decomposition technique and the far-field Green's function, an analytical solution of the radiated electric field from coupled traces is formulated by taking both the common and differential-mode currents into consideration. The analytical solution of the radiated electric field is further used to predict the EMI from differential microstrip pairs with time-domain input...
The prediction of surge phenomena is required for designing effective lightning protection methodologies, and circuit-theory-based simulation techniques, which assume the transverse electromagnetic (TEM) mode, have traditionally been widely employed for lightning surge analysis. Recently, the finite-difference time-domain (FDTD) method, which is one of the full-wave numerical approaches, has become...
Electromagnetic noise source of an integrated circuit (IC) can be approximately modeled with three dipole moments. To improve the previous dipole moments extraction method using 3 TEM cell measurements data, a new dipole moments extraction technique using 24 measurements data in a GTEM cell is proposed herein. The nonlinear least square (NLS) method is applied to accurately extract the three dipole...
Electrically long differential signal traces may introduce significant signal skew due to weave effect that deteriorates the signal quality. As serial data link pushes towards higher data transfer rate and yet the length of the signal trace has not reduced, the weave effect will become significant. Full wave method is often used to study the weave effect, however, the computational time is expensive...
By use of French mesoscale non-hydrostatic numerical model Meso-NH, using two kinds of ice phase particles scheme: ICE3 scheme (no hail), ICE4 scheme (with hail), simulate the thunderstorm clouds charge structure, lightning flash rates to explore the impact of the hail process on the microphysical and electrical processes of the thunderstorm clouds. The results showed that: 1) ICE4 scheme of thunderstorm...
Multi-objective optimization methods are applied to solve various issues in fields of not only mechanical engineering but also management, medicine, etc. Preference set-based design (PSD) method is one of them and has been successfully applied in the mechanical engineering field. We have discussed the utility when applying the PSD method to solve various electrical and electronics problems. In this...
It is well known that mutual coupling effect and problems exist between transmitting and receiving antennas. One factor is the coupling effect between antennas and masts. It can be more than 1 dB for omni-directional antennas with vertical polarization. This effect can be improved by utilizing the average method of changing distance between antennas and antenna mast. According to the reference site...
In this paper, parallel fulfillment is developed for calculation of the electric field and radiation patterns of three-dimensional electromagnetic (EM) radiation problems by using time-domain finite element method (TDFEM). To speed up the calculation process, SuperLU of a Message Passing Interface (MPI) version called SuperLU_DIST is employed in this approach. Finally, a rectangular waveguide and...
In power electronic devices, the winding temperature of the transformer in operation needs to be monitored in real time. But the Electromagnetic Interference(EMI) problems cause the measured winding temperature fluctuates anomalously. In this paper, the 10MVA transformer in the cabinet of a transformer rectifier is studied as a specific case, the temperature measurement circuit of the transformer...
Sandwich winding is usually used for low conduction loss and low leakage inductance in insolated converters. But it also tends to deteriorate the common mode (CM) EMI noise because of the bigger parasitic capacitances between primary and secondary windings. This paper analyzes the CM noise transferring path for typical isolated converters. Influence of different ground point location of the shielding...
The performance of the wireless power transfer (WPT) system is highly constrained by the coils in the coupling field. The coils can be fabricated as multi-layer Printed Spiral Coil (PSC) due to the development of the Printed Circuit Board (PCB) technique. This spatial effective coil implements the miniaturization for medical implants with higher inductance and lower resonance frequency. The accurate...
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