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An Empirical Characterization of Galvanized Steel Ohmic Losses—Application to the Modeling of Large Resonant Structures 镀锌钢欧姆损耗的经验表征——在大型谐振结构建模中的应用
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-09-27 DOI: 10.1109/LEMCPA.2022.3210040
Y. Berthoud;J.-M. Duchamp;A. Niembro-Martin;E. Dreina;F. Ndagijimana
This letter deals with the characterization of Ohmic losses induced by galvanized steel in diffuse field environments. It is then used to compute the mean response of electrically large resonant structures using a statistical method called “Power Balance” (PWB). The Ohmic losses are often predominant and, thus, need to be properly modeled for the method to be accurate. It is especially true for galvanized steel, as it induces losses several orders of magnitude greater than those of untreated steel. First, this letter reviews the principle of the method before presenting a new empirical method for evaluating Ohmic losses induced by coated metals such as galvanized steel. Finally, this method is used as a tool to create an accurate PWB model of a 6-cavity configuration, validated by measurements.
这封信涉及扩散场环境中镀锌钢引起的欧姆损失的表征。然后使用一种称为“功率平衡”(PWB)的统计方法计算大型电气谐振结构的平均响应。欧姆损耗通常是主要的,因此,需要对该方法进行适当的建模才能准确。镀锌钢尤其如此,因为它引起的损失比未经处理的钢大几个数量级。首先,这封信回顾了该方法的原理,然后提出了一种新的经验方法来评估镀锌钢等涂层金属引起的欧姆损失。最后,该方法被用作创建6腔配置的精确PWB模型的工具,并通过测量进行验证。
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引用次数: 0
Analysis of Electromagnetic Noise From Switching Power Modules Using Wide Band Gap Semiconductors 宽带隙半导体开关电源模块的电磁噪声分析
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-09-16 DOI: 10.1109/LEMCPA.2022.3207234
Koh Watanabe;Misaki Komatsu;Mai Aoi;Ryota Sakai;Satoshi Tanaka;Makoto Nagata
Wide band gap (WBG) semiconductors, such as gallium nitride (GaN), have become popular among switching power modules. In pursuing power conversion efficiency, power module’s high-speed and high-power operation leads to electromagnetic (EM) noise in a very wide frequency range, potentially interfering with nearby wireless communications [e.g., long-term evolution (LTE)]. This letter analyzes the source of EM noise from the power modules using GaN transistors in half-bridge circuits. EM noise was clearly observed in the proximity of power modules and attributed to two primary sources in the frequency range of interest up to 6 GHz: 1) the periodical switching operation of GaN transistors in the output stage and 2) the logic operation of complementary metal–oxide–semiconductor digital circuits to control gate drivers, in the lower and upper side of frequencies, respectively. Measurements analyzed the EM noise characteristics at different probing locations over the assembly of two GaN power modules as well as in different operating conditions by strategically supplying source signals. The influence of EM noise on LTE receiver performance is evaluated with wireless system-level simulation and related to the degradation of its minimum receivable input power.
宽带隙(WBG)半导体,如氮化镓(GaN),已在开关电源模块中流行起来。在追求功率转换效率的过程中,功率模块的高速和高功率操作会在非常宽的频率范围内产生电磁(EM)噪声,可能会干扰附近的无线通信[例如,长期演进(LTE)]。这封信分析了在半桥电路中使用GaN晶体管的功率模块的EM噪声源。在功率模块附近清楚地观察到EM噪声,并将其归因于在高达6 GHz的感兴趣频率范围内的两个主要源:1)输出级中GaN晶体管的周期性开关操作和2)互补金属-氧化物-半导体数字电路的逻辑操作,以控制频率的下侧和上侧的栅极驱动器,分别地测量分析了在两个GaN功率模块的组件上的不同探测位置以及通过战略性地提供源信号在不同操作条件下的EM噪声特性。EM噪声对LTE接收机性能的影响通过无线系统级仿真进行评估,并与其最小可接收输入功率的退化有关。
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引用次数: 2
Synopsis of the September 2022 Issue of the IEEE Letters on Electromagnetic Compatibility Practice and Applications 《IEEE电磁兼容性实践与应用快报》2022年9月号综述
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-09-02 DOI: 10.1109/LEMCPA.2022.3196482
Summary form only: Abstracts of articles presented in this issue of the publication.
仅限摘要形式:本期出版物中的文章摘要。
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引用次数: 0
Efficient Use of a Hybrid Chamber for Radiated Susceptibility Tests 混合室在辐射敏感度测试中的有效使用
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-08-16 DOI: 10.1109/LEMCPA.2022.3197056
Danilo Izzo;Robert Vogt-Ardatjew;Frank Leferink
This letter describes the design and operation of a novel type of hybrid chamber used for radiated susceptibility tests. This is a semi-anechoic chamber with the possibility to install a vibrating intrinsic reverberation chamber inside. This testing environment can be used for the execution of the radiated susceptibility tests using both the deterministic and stochastic methodologies but without changing the test location, nor moving the device under test with its auxiliary equipment. This allows test engineers to combine the advantages of both reverberation and semi-anechoic chambers with a minimum effort, making it a very practical, cost- and time-efficient solution. The electric field into the reverberation chamber is monitored by eight electric field probes, permitting the closed-loop control of the electric field strength level and an efficient real-time analysis of the performance indicators discussed in this letter.
这封信描述了一种用于辐射敏感度测试的新型混合室的设计和操作。这是一个半消声室,可以在里面安装一个振动固有混响室。该测试环境可用于使用确定性和随机性方法进行辐射敏感性测试,但不改变测试位置,也不移动被测设备及其辅助设备。这使测试工程师能够以最小的工作量将混响室和半消声室的优势结合起来,使其成为一种非常实用、成本和时间高效的解决方案。进入混响室的电场由八个电场探针监测,允许对电场强度水平进行闭环控制,并对本文中讨论的性能指标进行有效的实时分析。
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引用次数: 0
A Discussion of the New M-component Engineering Model From Azadifar et al. by Simultaneous Measurements in Rocket-Triggered Lightning Azadifar等提出的新M分量工程模型在火箭触发闪电中的同时测量讨论
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-07-28 DOI: 10.1109/LEMCPA.2022.3194088
Quanxin Li;Jianguo Wang;Li Cai;Mi Zhou;Yadong Fan
A discussion of the new M-component engineering model proposed by Azadifar et al. (2019) is presented. The M-component electric fields were measured at both close distance of 78 m and far multiple-station distances ranging 69 km −126 km in rocket-triggered lightning. Both the fast microsecond-scale pulse and the following slow millisecond-scale pulse are reproduced in the new engineering model. The electrostatic field component produced by the return-stroke like process along the branch among the new engineering model contributes to weaken the positive overshoot of the close M-component electric field. The modified new engineering model considering an exponential current decay along the grounded channel in the study allows a more satisfactory performance of reproducing full M-component electric fields than that of the model from Azadifar et al.
对Azadifar等人提出的新M组件工程模型进行了讨论。(2019)。在火箭触发的闪电中,在78米的近距离和69公里-126公里的远多站距离测量了M分量电场。在新的工程模型中再现了快速微秒级脉冲和随后的慢速毫秒级脉冲。在新的工程模型中,由沿支路的类似回程过程产生的静电场分量有助于削弱闭合M分量电场的正超调。在研究中,考虑到沿接地通道的指数电流衰减的改进的新工程模型比Azadifar等人的模型在再现全M分量电场方面具有更令人满意的性能。
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引用次数: 1
GPU and CPU-Based Parallel FDTD Methods for Frequency-Dependent Transmission Line Models 基于GPU和CPU的频率相关传输线模型并行FDTD方法
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-07-15 DOI: 10.1109/LEMCPA.2022.3191597
Manuja Gunawardana;Behzad Kordi
Finite-difference time-domain (FDTD) is a popular method utilized for solving frequency-dependent transmission line structures. It is also conveniently applicable to nonuniform wires. The FDTD algorithm discretizes the transmission line problem into a finite number of space-segments and solve for the voltage and current of each segment at every time-step. Therefore, they inherently involve more computations per timestep than conventional terminal based models. In this letter, parallel implementations of a modified FDTD algorithm for a frequency-dependent transmission line problem using multicore CPU and GPU architectures are proposed in order to increase its computational efficiency. Accuracy and performance of the parallel FDTD methods are discussed with examples. The results indicate that a speedup of a few folds compared to serial execution is achieved by the parallel implementation using multicore CPU architecture whereas a massive speedup is achieved by using GPU. The proposed model is also suitable for modelling transmission lines in massively parallel electromagnetic transient (EMT) simulation methods.
时域有限差分法(FDTD)是一种常用的求解频率相关传输线结构的方法。它也方便地适用于不均匀的电线。FDTD算法将传输线问题离散为有限数量的空间段,并在每个时间步长求解每个段的电压和电流。因此,与传统的基于终端的模型相比,它们固有地每时间步长涉及更多的计算。在这封信中,为了提高计算效率,提出了使用多核CPU和GPU架构来并行实现用于频率相关传输线问题的改进FDTD算法。通过算例讨论了并行FDTD方法的精度和性能。结果表明,与串行执行相比,使用多核CPU架构的并行实现可以实现几倍的加速,而使用GPU可以实现巨大的加速。所提出的模型也适用于大规模并行电磁暂态(EMT)模拟方法中的输电线路建模。
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引用次数: 1
Shielding Effectiveness of Gaskets: MIL DTL 83528G Conditions Against Requirements in Practice 垫片的屏蔽效果:MIL DTL 83528G实践中不符合要求的条件
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-06-15 DOI: 10.1109/LEMCPA.2022.3183448
Pavithrakrishnan Radhakrishnan;Tim Claeys;Johan Catrysse;Davy Pissoort
In this letter, it is suggested how the basic setup of MIL DTL 83528G can easily be adapted to the situations occurring in practice: factors such as the orientations of antennas with respect to the setup, beam width of antennas, and distances between the clamping bolts which hold the gaskets in place, are taken into account. Typical measurement results under different measuring conditions related to practical situations, are reported and discussed, as well as suggestions for good design.
在这封信中,建议如何轻松地将MIL DTL 83528G的基本设置适应实践中出现的情况:考虑了天线相对于设置的方向、天线的波束宽度以及将垫圈固定到位的夹紧螺栓之间的距离等因素。报告并讨论了在不同测量条件下与实际情况相关的典型测量结果,以及对良好设计的建议。
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引用次数: 3
RF Heating Dependence of Head Model Positioning Using 4-Channel Parallel Transmission MRI and a Deep Brain Stimulation Construct 利用4通道并行传输MRI和脑深部刺激构建的头部模型定位的射频加热相关性
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-06-08 DOI: 10.1109/LEMCPA.2022.3180974
Benson Yang;Chih-Hung Chen;Simon J. Graham
Parallel radiofrequency transmission (pTx) continues to demonstrate promise in addressing magnetic resonance imaging (MRI) challenges at higher magnetic-field strengths, particularly regarding the safety of patients with implanted deep brain stimulation (DBS) devices. Radiofrequency (RF) shimming optimization methods have shown the potential of pTx to minimize DBS implant safety concerns relating to induced RF heating at 3T. This letter continues the assessment of 4-channel pTx technology and its associated “safe mode” for the DBS application. Safe mode sensitivity to patient setup mispositioning and movement is important and was studied in proof-of-concept. Phantom mispositioning can impact the electromagnetic near-field distribution and potentially affect the RF heating effects along an implanted DBS device. However, thermal simulations studying DBS patient head movements were performed and indicated minimal safety risks. These results were further validated by an MRI phantom mispositioning experiment encompassing the head motion studied in simulation. Temperature increases remained below +1°C for all tested scenarios in simulation and experiment. However, a severe pitch rotation in the experiment led to a +0.8°C increase, indicating that significant patient movement may still shift implanted DBS leads into higher risk zones. In conclusion, this letter further supports the potential of 4-channel pTx to address DBS patient safety.
并行射频传输(pTx)在解决更高磁场强度下的磁共振成像(MRI)挑战方面继续显示出前景,特别是在植入脑深部刺激(DBS)设备的患者的安全性方面。射频(RF)匀场优化方法已经显示了pTx的潜力,以最小化与3T下感应RF加热相关的DBS植入物安全问题。本函继续对DBS应用的4通道pTx技术及其相关“安全模式”进行评估。安全模式对患者设置错位和移动的敏感性很重要,并在概念验证中进行了研究。幻影错位会影响电磁近场分布,并可能影响沿植入DBS设备的RF加热效应。然而,对DBS患者头部运动进行了热模拟研究,表明安全风险最小。这些结果通过MRI体模错位实验得到了进一步验证,该实验包括模拟中研究的头部运动。在模拟和实验中,所有测试场景的温度升高都保持在+1°C以下。然而,实验中严重的螺距旋转导致+0.8°C升高,这表明患者的显著移动仍可能将植入的DBS导线转移到更高风险区域。总之,这封信进一步支持4通道pTx解决DBS患者安全问题的潜力。
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引用次数: 0
Behavioral Modeling of an Off-the-Shelf Damped Sinusoidal Transient Generator 现成阻尼正弦瞬态发生器的行为建模
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-04-08 DOI: 10.1109/LEMCPA.2022.3165762
Xiaokang Liu;Flavia Grassi;François Trotti;Werner Hirschi
In this letter, experimental characterization and behavioral modeling of an off-the-shelf damped sinusoidal wave generator operating at different frequencies are addressed. Two modeling strategies are developed which lead to an active and a passive circuit representation of the generator, whose involved parameters are optimized by making use of time-domain measurement results obtained with the generator connected to different load impedances. It is shown that either the active or the passive model can assure accurate prediction of the generated waveforms, depending on the specific frequency. The proposed models can be effortlessly implemented in common circuit simulators, and used for systematic design of injection devices for transient conducted susceptibility testing as well as for simulation of the corresponding test setups. As an illustrative example, the proposed models are exploited to predict the actual waveform induced at the input pins of the device under test in a simplified pulse current injection test setup.
在这封信中,讨论了在不同频率下运行的现成阻尼正弦波发生器的实验特性和行为建模。开发了两种建模策略,这两种策略导致发电机的有源和无源电路表示,通过利用发电机连接到不同负载阻抗时获得的时域测量结果来优化其相关参数。结果表明,无论是主动模型还是被动模型,都可以确保根据特定频率准确预测生成的波形。所提出的模型可以在通用电路模拟器中轻松实现,并用于瞬态传导磁化率测试的注入装置的系统设计以及相应测试装置的模拟。作为说明性示例,在简化的脉冲电流注入测试设置中,利用所提出的模型来预测在被测器件的输入引脚处感应的实际波形。
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引用次数: 2
A Comparative Performance Analysis of 6T & 9T SRAM Integrated Circuits: SOI vs. Bulk 6T与9T SRAM集成电路的性能比较分析:SOI与Bulk
Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2022-04-01 DOI: 10.1109/LEMCPA.2022.3163963
Qazi Mashaal Khan;Richard Perdriau;Mohamed Ramdani;Mohsen Koohestani
This letter evaluates the performance of 6T & 9T static random access memory (SRAM) cells, for data stability and power metrics, with the aim to compare silicon-on-insulator (SOI) and bulk CMOS technologies. Each SRAM topology was designed & simulated in 180 nm 5 V XFAB-SOI and AMS-bulk processes, using optimized parameters and compatible devices. The fundamental variables analyzed were read noise margins, write trip current & voltage as well as leakage current (LC) and static power dissipation (SPD) under process and temperature (PT) variations. The static noise margin (SNM) butterfly curve and N-curve methodologies were used to assess the mentioned parameters. Compared to bulk technology, the SRAM cells designed with SOI were found to have lower SPD & LC, higher data stability, lower write ability, larger sensitivity to process variations and higher resilience to temperature deviations.
这封信评估了6T和9T静态随机存取存储器(SRAM)单元在数据稳定性和功率指标方面的性能,目的是比较绝缘体上硅(SOI)和体CMOS技术。每个SRAM拓扑结构都是在180 nm 5V XFAB-SOI和AMS批量工艺中设计和模拟的,使用优化的参数和兼容的设备。分析的基本变量是读取噪声裕度、写入跳闸电流和电压以及工艺和温度(PT)变化下的漏电流(LC)和静态功耗(SPD)。静态噪声裕度(SNM)蝶形曲线和N曲线方法用于评估上述参数。与块体技术相比,使用SOI设计的SRAM单元具有更低的SPD和LC、更高的数据稳定性、更低的写入能力、更大的工艺变化敏感性和更高的温度偏差弹性。
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引用次数: 3
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IEEE Letters on Electromagnetic Compatibility Practice and Applications
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