Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522749
Ren Hongna, Z. Xiaoying, Zhong Heng, Song Yuning, Wang Zifan
To study the effect of natural lightning shapes on electromagnetic spectrum characteristics, a new method leading to the law of lightning electromagnetic spectrum characteristics is put forward. Firstly, generate 3-D lightning channel models randomly with different shapes by setting different parameters of dielectric breakdown model. Then, add excitation, namely double-exponential lightning current. Lastly, calculate the characteristics of time-varying electric field spectrum using finite difference time domain (FDTD) method. Research shows that fractal dimension has great influence on spectrum characteristics of lightning leader. The degree of influences of probability exponent on the lightning spectrum characteristics is more than that of internal electric field of the channel while critical electric field threshold is the least. Results show that there is an obviously linear correlation between probability exponent and lightning spectrum peak value. Some useful conclusions have been drawn from the research, which will be reference for lightning simulation, especially for the spectrum research.
{"title":"Effect of different lightning shapes on electromagnetic spectrum characteristics","authors":"Ren Hongna, Z. Xiaoying, Zhong Heng, Song Yuning, Wang Zifan","doi":"10.1109/APEMC.2016.7522749","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522749","url":null,"abstract":"To study the effect of natural lightning shapes on electromagnetic spectrum characteristics, a new method leading to the law of lightning electromagnetic spectrum characteristics is put forward. Firstly, generate 3-D lightning channel models randomly with different shapes by setting different parameters of dielectric breakdown model. Then, add excitation, namely double-exponential lightning current. Lastly, calculate the characteristics of time-varying electric field spectrum using finite difference time domain (FDTD) method. Research shows that fractal dimension has great influence on spectrum characteristics of lightning leader. The degree of influences of probability exponent on the lightning spectrum characteristics is more than that of internal electric field of the channel while critical electric field threshold is the least. Results show that there is an obviously linear correlation between probability exponent and lightning spectrum peak value. Some useful conclusions have been drawn from the research, which will be reference for lightning simulation, especially for the spectrum research.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115928944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522942
J. Schutt-Ainé
The main challenge in the synthesis of macromodel-based SPICE subcircuits resides in the accurate representation of the complex-pole residue pairs from the rational function expansion. This paper examines the different circuit topologies that can be used from the scattering parameter description. The circuit extraction algorithms are studied and tested through the use of simulation to verify the robustness and accuracy of these models.
{"title":"SPICE circuit synthesis from complex pole-residue S-parameter representation","authors":"J. Schutt-Ainé","doi":"10.1109/APEMC.2016.7522942","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522942","url":null,"abstract":"The main challenge in the synthesis of macromodel-based SPICE subcircuits resides in the accurate representation of the complex-pole residue pairs from the rational function expansion. This paper examines the different circuit topologies that can be used from the scattering parameter description. The circuit extraction algorithms are studied and tested through the use of simulation to verify the robustness and accuracy of these models.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"5 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116661529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522816
Shijun Yang, Qingbin Chen, Wei Chen
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 on CM noise is investigated. A novel CM noise reduction method by optimizing the spacing between shielding and windings is proposed. The advantages of the proposed concepts and strategies are verified and demonstrated on a Fly-back converter. More than 20dB CM noise attenuation is achieved.
{"title":"Common mode EMI noise reduction technique by shielding optimization in isolated converters","authors":"Shijun Yang, Qingbin Chen, Wei Chen","doi":"10.1109/APEMC.2016.7522816","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522816","url":null,"abstract":"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 on CM noise is investigated. A novel CM noise reduction method by optimizing the spacing between shielding and windings is proposed. The advantages of the proposed concepts and strategies are verified and demonstrated on a Fly-back converter. More than 20dB CM noise attenuation is achieved.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116963182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522748
Jianquan Lou, Q. Sun, W. You, Yingchun Shu, A. Bhobe, Yuan Jinghan
Flyback converter is widely used for its high efficiency. However due to fast switching currents and voltages, it can cause high conducted emissions in a system. In this paper we present a method to characterize the EMI noise generation and the coupling mechanism in flyback converters. We also derive analytical formulae to calculate the frequency and amplitude of this EMI noise, which provides an easy way to predict EMI noise in early design stage. The results calculated by formulae are compared with simulation and agree well. A new standard filter design procedure for flyback converter is proposed based on these analytical formulae, which can help to mitigate electromagnetic compatibility (EMC) risk in the beginning of the project.
{"title":"Analytical calculation of conducted EMI in flyback converters","authors":"Jianquan Lou, Q. Sun, W. You, Yingchun Shu, A. Bhobe, Yuan Jinghan","doi":"10.1109/APEMC.2016.7522748","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522748","url":null,"abstract":"Flyback converter is widely used for its high efficiency. However due to fast switching currents and voltages, it can cause high conducted emissions in a system. In this paper we present a method to characterize the EMI noise generation and the coupling mechanism in flyback converters. We also derive analytical formulae to calculate the frequency and amplitude of this EMI noise, which provides an easy way to predict EMI noise in early design stage. The results calculated by formulae are compared with simulation and agree well. A new standard filter design procedure for flyback converter is proposed based on these analytical formulae, which can help to mitigate electromagnetic compatibility (EMC) risk in the beginning of the project.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115590862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522966
Yanfei Dong, Peiguo Liu
Electromagnetic band-gap (EBG) structure could effectively control electromagnetic wave propagation. In this paper, we proposed two kinds of electromagnetic band-gap structure. The proposed graphene EBG adopts square open-loop shape on ground planes, which displays good characteristics in dynamically adjusting the electromagnetic wave propagation in terahertz range. The same characteristics are retrieved in circular column electromagnetic band-gap based on graphene stack due to tunable dielectric property. The prototype structures are expected to use for potential terahertz devices.
{"title":"Applications of graphene in terahertz electromagnetic band-gap structure designs","authors":"Yanfei Dong, Peiguo Liu","doi":"10.1109/APEMC.2016.7522966","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522966","url":null,"abstract":"Electromagnetic band-gap (EBG) structure could effectively control electromagnetic wave propagation. In this paper, we proposed two kinds of electromagnetic band-gap structure. The proposed graphene EBG adopts square open-loop shape on ground planes, which displays good characteristics in dynamically adjusting the electromagnetic wave propagation in terahertz range. The same characteristics are retrieved in circular column electromagnetic band-gap based on graphene stack due to tunable dielectric property. The prototype structures are expected to use for potential terahertz devices.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115630152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522924
Huapeng Zhao, Jun Hu, Z. Chen
In order to reduce memory cost, this paper applies block Gauss-Seidel method to solve the unknowns in hybrid discrete singular convolution (DSC)-method of moments (MoM) modeling of reverberation chambers. Based on block Gauss-Seidel method, the DSC and MoM sub-problems are alternatively solved until convergence is achieved. Compared to existing methods, the proposed solution method significantly saves memory cost. Simulations are performed to study the convergence behavior of the proposed method.
{"title":"An alternative solution method for hybrid discrete singular convolution-method of moments modeling of reverberation chambers","authors":"Huapeng Zhao, Jun Hu, Z. Chen","doi":"10.1109/APEMC.2016.7522924","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522924","url":null,"abstract":"In order to reduce memory cost, this paper applies block Gauss-Seidel method to solve the unknowns in hybrid discrete singular convolution (DSC)-method of moments (MoM) modeling of reverberation chambers. Based on block Gauss-Seidel method, the DSC and MoM sub-problems are alternatively solved until convergence is achieved. Compared to existing methods, the proposed solution method significantly saves memory cost. Simulations are performed to study the convergence behavior of the proposed method.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116605788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522910
Yaqi Yang, Zhibin Zhao, S. Gu, Di Li, Xiangxue Zeng
This paper analyzes the surge interference of the port of smart subassembly for potential difference of the grid while lightning strike on the metal framework of smart substation. The difference between the smart substation with conventional substations while direct lightning stroke is compared, and the influences are summarized.
{"title":"Analysis of the effect on smart subassembly in smart substation for lightning strike metal framework","authors":"Yaqi Yang, Zhibin Zhao, S. Gu, Di Li, Xiangxue Zeng","doi":"10.1109/APEMC.2016.7522910","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522910","url":null,"abstract":"This paper analyzes the surge interference of the port of smart subassembly for potential difference of the grid while lightning strike on the metal framework of smart substation. The difference between the smart substation with conventional substations while direct lightning stroke is compared, and the influences are summarized.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115483181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522998
Li Junchuan, Wang Jingqin, L. Yanan, C. Yulong, Fan Haoliang, Li Huijun
This paper proposes a new complex resonant topology of wireless power transfer system, which still get better transmission performance in far distance. First, the circuit structure is theoretical analyzed based on LCL type complex resonant topology in the receiver, the reflective impedance, the load power and transmission efficiency and other expressions are deduced. The simulation model is constructed by MATLAB and compared with traditional series resonant structure. Simulation and experimental data show that the proposed structure improves the quality factor Q value and the transmission efficiency can reach more than eighty percent which up to ninety-five percent at low degree of coupling coefficient, and reduces the current flowing through the switch more than fifty percent in order to achieve the lower conduction loss; in the case of long-range and low coupling coefficient, get better transmission performance.
{"title":"The study based on new resonant topology of wireless power transfer system","authors":"Li Junchuan, Wang Jingqin, L. Yanan, C. Yulong, Fan Haoliang, Li Huijun","doi":"10.1109/APEMC.2016.7522998","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522998","url":null,"abstract":"This paper proposes a new complex resonant topology of wireless power transfer system, which still get better transmission performance in far distance. First, the circuit structure is theoretical analyzed based on LCL type complex resonant topology in the receiver, the reflective impedance, the load power and transmission efficiency and other expressions are deduced. The simulation model is constructed by MATLAB and compared with traditional series resonant structure. Simulation and experimental data show that the proposed structure improves the quality factor Q value and the transmission efficiency can reach more than eighty percent which up to ninety-five percent at low degree of coupling coefficient, and reduces the current flowing through the switch more than fifty percent in order to achieve the lower conduction loss; in the case of long-range and low coupling coefficient, get better transmission performance.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123528766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522725
Sun Haifeng, Wang Pei, C. Haojing, Ai Xiancang, E. Tianlong, Su Bonian, Zhuo Rongrong, L. Zhihong, Wang Chunfeng
Due to the electric power industry and oil and gas industry have a close principle to the preferential transmission route. The electromagnetic impact of power transmission line is increasingly prominent. To explore the electromagnetic effect of electric power line on the multi buried metal pipeline, the mechanism of the electromagnetic effect of the AC transmission line to the oil gas pipeline is analyzed and the simulation model of the electromagnetic effect of 750kV AC line to the multi buried oil gas pipeline is built in the electromagnetic simulation software CDEGS, which is based on the method of moments. Aim at Qiaowan 750kV AC transmission line, the paper analyzed the electromagnetic effect of the power frequency current, single-phase short-circuit fault current and the lighting current on the oil gas pipeline. At last, the influence of the interference voltage of the 750kV AC transmission engineering to the buried oil gas pipeline is obtained and the shortest safe distance from the tower and underground pipelines and related protection measures is put forward.
{"title":"Study on electromagnetic influence of 750kV AC transmission lines on multiple buried pipelines","authors":"Sun Haifeng, Wang Pei, C. Haojing, Ai Xiancang, E. Tianlong, Su Bonian, Zhuo Rongrong, L. Zhihong, Wang Chunfeng","doi":"10.1109/APEMC.2016.7522725","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522725","url":null,"abstract":"Due to the electric power industry and oil and gas industry have a close principle to the preferential transmission route. The electromagnetic impact of power transmission line is increasingly prominent. To explore the electromagnetic effect of electric power line on the multi buried metal pipeline, the mechanism of the electromagnetic effect of the AC transmission line to the oil gas pipeline is analyzed and the simulation model of the electromagnetic effect of 750kV AC line to the multi buried oil gas pipeline is built in the electromagnetic simulation software CDEGS, which is based on the method of moments. Aim at Qiaowan 750kV AC transmission line, the paper analyzed the electromagnetic effect of the power frequency current, single-phase short-circuit fault current and the lighting current on the oil gas pipeline. At last, the influence of the interference voltage of the 750kV AC transmission engineering to the buried oil gas pipeline is obtained and the shortest safe distance from the tower and underground pipelines and related protection measures is put forward.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"339 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124308036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-17DOI: 10.1109/APEMC.2016.7522792
Kaitian Huang, Y. Zhanqing, Zhiye Gao, R. Zeng, Min Li, Lei Liu
Corona discharge appears near the HVDC lines when the surface electric field strength of the line is higher than the corona incept field. Ion flow will be formed under the affection electric field near conductors. Ion flow is a non-equilibrium plasma at low temperature, they are distributed among lines and the earth. Measurements of the DC synthetic electric field is important for the evaluation of the EMC of electric devices. Among several measuring methods, MEMS sensor is a new but useful one. When a MEMS electric field sensor with packaging is put into the area, charges will accumulate onto the shell of the sensor in a quick transient charging process and generate a reverse field. After the process finished, there exists an “empty zone” near the sensor where no charges in it. This paper studies the charging process of ion flow on packaging shell and the effects it cause, by using FEM simulation method and Multiphysics analysis, to provide theoretical basis for the design of MEMS sensors used for measuring electric field near HVDC. According to this paper, the effect of “empty zone” is lower than that of ion flow, the electric field changes it causes is about 50 V/m at the background target field 15 kV/m, while field changes caused by the ion flow among the area outside the sensor could be several dozen times of it.
{"title":"The charging process on sensor's shell in ion flow field and its influence towards electric field near HVDC lines","authors":"Kaitian Huang, Y. Zhanqing, Zhiye Gao, R. Zeng, Min Li, Lei Liu","doi":"10.1109/APEMC.2016.7522792","DOIUrl":"https://doi.org/10.1109/APEMC.2016.7522792","url":null,"abstract":"Corona discharge appears near the HVDC lines when the surface electric field strength of the line is higher than the corona incept field. Ion flow will be formed under the affection electric field near conductors. Ion flow is a non-equilibrium plasma at low temperature, they are distributed among lines and the earth. Measurements of the DC synthetic electric field is important for the evaluation of the EMC of electric devices. Among several measuring methods, MEMS sensor is a new but useful one. When a MEMS electric field sensor with packaging is put into the area, charges will accumulate onto the shell of the sensor in a quick transient charging process and generate a reverse field. After the process finished, there exists an “empty zone” near the sensor where no charges in it. This paper studies the charging process of ion flow on packaging shell and the effects it cause, by using FEM simulation method and Multiphysics analysis, to provide theoretical basis for the design of MEMS sensors used for measuring electric field near HVDC. According to this paper, the effect of “empty zone” is lower than that of ion flow, the electric field changes it causes is about 50 V/m at the background target field 15 kV/m, while field changes caused by the ion flow among the area outside the sensor could be several dozen times of it.","PeriodicalId":358257,"journal":{"name":"2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121464276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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