\documentclass[11pt,twoside]{article}\makeatletter

\IfFileExists{xcolor.sty}%
  {\RequirePackage{xcolor}}%
  {\RequirePackage{color}}
\usepackage{colortbl}
\usepackage{wrapfig}
\usepackage{ifxetex}
\ifxetex
  \usepackage{fontspec}
  \usepackage{xunicode}
  \catcode`⃥=\active \def⃥{\textbackslash}
  \catcode`❴=\active \def❴{\{}
  \catcode`❵=\active \def❵{\}}
  \def\textJapanese{\fontspec{Noto Sans CJK JP}}
  \def\textChinese{\fontspec{Noto Sans CJK SC}}
  \def\textKorean{\fontspec{Noto Sans CJK KR}}
  \setmonofont{DejaVu Sans Mono}
  
\else
  \IfFileExists{utf8x.def}%
   {\usepackage[utf8x]{inputenc}
      \PrerenderUnicode{–}
    }%
   {\usepackage[utf8]{inputenc}}
  \usepackage[english]{babel}
  \usepackage[T1]{fontenc}
  \usepackage{float}
  \usepackage[]{ucs}
  \uc@dclc{8421}{default}{\textbackslash }
  \uc@dclc{10100}{default}{\{}
  \uc@dclc{10101}{default}{\}}
  \uc@dclc{8491}{default}{\AA{}}
  \uc@dclc{8239}{default}{\,}
  \uc@dclc{20154}{default}{ }
  \uc@dclc{10148}{default}{>}
  \def\textschwa{\rotatebox{-90}{e}}
  \def\textJapanese{}
  \def\textChinese{}
  \IfFileExists{tipa.sty}{\usepackage{tipa}}{}
\fi
\def\exampleFont{\ttfamily\small}
\DeclareTextSymbol{\textpi}{OML}{25}
\usepackage{relsize}
\RequirePackage{array}
\def\@testpach{\@chclass
 \ifnum \@lastchclass=6 \@ne \@chnum \@ne \else
  \ifnum \@lastchclass=7 5 \else
   \ifnum \@lastchclass=8 \tw@ \else
    \ifnum \@lastchclass=9 \thr@@
   \else \z@
   \ifnum \@lastchclass = 10 \else
   \edef\@nextchar{\expandafter\string\@nextchar}%
   \@chnum
   \if \@nextchar c\z@ \else
    \if \@nextchar l\@ne \else
     \if \@nextchar r\tw@ \else
   \z@ \@chclass
   \if\@nextchar |\@ne \else
    \if \@nextchar !6 \else
     \if \@nextchar @7 \else
      \if \@nextchar (8 \else
       \if \@nextchar )9 \else
  10
  \@chnum
  \if \@nextchar m\thr@@\else
   \if \@nextchar p4 \else
    \if \@nextchar b5 \else
   \z@ \@chclass \z@ \@preamerr \z@ \fi \fi \fi \fi
   \fi \fi  \fi  \fi  \fi  \fi  \fi \fi \fi \fi \fi \fi}
\gdef\arraybackslash{\let\\=\@arraycr}
\def\@textsubscript#1{{\m@th\ensuremath{_{\mbox{\fontsize\sf@size\z@#1}}}}}
\def\Panel#1#2#3#4{\multicolumn{#3}{){\columncolor{#2}}#4}{#1}}
\def\abbr{}
\def\corr{}
\def\expan{}
\def\gap{}
\def\orig{}
\def\reg{}
\def\ref{}
\def\sic{}
\def\persName{}\def\name{}
\def\placeName{}
\def\orgName{}
\def\textcal#1{{\fontspec{Lucida Calligraphy}#1}}
\def\textgothic#1{{\fontspec{Lucida Blackletter}#1}}
\def\textlarge#1{{\large #1}}
\def\textoverbar#1{\ensuremath{\overline{#1}}}
\def\textquoted#1{‘#1’}
\def\textsmall#1{{\small #1}}
\def\textsubscript#1{\@textsubscript{\selectfont#1}}
\def\textxi{\ensuremath{\xi}}
\def\titlem{\itshape}
\newenvironment{biblfree}{}{\ifvmode\par\fi }
\newenvironment{bibl}{}{}
\newenvironment{byline}{\vskip6pt\itshape\fontsize{16pt}{18pt}\selectfont}{\par }
\newenvironment{citbibl}{}{\ifvmode\par\fi }
\newenvironment{docAuthor}{\ifvmode\vskip4pt\fontsize{16pt}{18pt}\selectfont\fi\itshape}{\ifvmode\par\fi }
\newenvironment{docDate}{}{\ifvmode\par\fi }
\newenvironment{docImprint}{\vskip 6pt}{\ifvmode\par\fi }
\newenvironment{docTitle}{\vskip6pt\bfseries\fontsize{22pt}{25pt}\selectfont}{\par }
\newenvironment{msHead}{\vskip 6pt}{\par}
\newenvironment{msItem}{\vskip 6pt}{\par}
\newenvironment{rubric}{}{}
\newenvironment{titlePart}{}{\par }

\newcolumntype{L}[1]{){\raggedright\arraybackslash}p{#1}}
\newcolumntype{C}[1]{){\centering\arraybackslash}p{#1}}
\newcolumntype{R}[1]{){\raggedleft\arraybackslash}p{#1}}
\newcolumntype{P}[1]{){\arraybackslash}p{#1}}
\newcolumntype{B}[1]{){\arraybackslash}b{#1}}
\newcolumntype{M}[1]{){\arraybackslash}m{#1}}
\definecolor{label}{gray}{0.75}
\def\unusedattribute#1{\sout{\textcolor{label}{#1}}}
\DeclareRobustCommand*{\xref}{\hyper@normalise\xref@}
\def\xref@#1#2{\hyper@linkurl{#2}{#1}}
\begingroup
\catcode`\_=\active
\gdef_#1{\ensuremath{\sb{\mathrm{#1}}}}
\endgroup
\mathcode`\_=\string"8000
\catcode`\_=12\relax

\usepackage[a4paper,twoside,lmargin=1in,rmargin=1in,tmargin=1in,bmargin=1in,marginparwidth=0.75in]{geometry}
\usepackage{framed}

\definecolor{shadecolor}{gray}{0.95}
\usepackage{longtable}
\usepackage[normalem]{ulem}
\usepackage{fancyvrb}
\usepackage{fancyhdr}
\usepackage{graphicx}
\usepackage{marginnote}

\renewcommand{\@cite}[1]{#1}


\renewcommand*{\marginfont}{\itshape\footnotesize}

\def\Gin@extensions{.pdf,.png,.jpg,.mps,.tif}

  \pagestyle{fancy}

\usepackage[pdftitle={Radiated Electromagnetic Interference(Emi) Mechanism of High Power Inverter},
 pdfauthor={}]{hyperref}
\hyperbaseurl{}

	 \paperwidth210mm
	 \paperheight297mm
              
\def\@pnumwidth{1.55em}
\def\@tocrmarg {2.55em}
\def\@dotsep{4.5}
\setcounter{tocdepth}{3}
\clubpenalty=8000
\emergencystretch 3em
\hbadness=4000
\hyphenpenalty=400
\pretolerance=750
\tolerance=2000
\vbadness=4000
\widowpenalty=10000

\renewcommand\section{\@startsection {section}{1}{\z@}%
     {-1.75ex \@plus -0.5ex \@minus -.2ex}%
     {0.5ex \@plus .2ex}%
     {\reset@font\Large\bfseries}}
\renewcommand\subsection{\@startsection{subsection}{2}{\z@}%
     {-1.75ex\@plus -0.5ex \@minus- .2ex}%
     {0.5ex \@plus .2ex}%
     {\reset@font\Large}}
\renewcommand\subsubsection{\@startsection{subsubsection}{3}{\z@}%
     {-1.5ex\@plus -0.35ex \@minus -.2ex}%
     {0.5ex \@plus .2ex}%
     {\reset@font\large}}
\renewcommand\paragraph{\@startsection{paragraph}{4}{\z@}%
     {-1ex \@plus-0.35ex \@minus -0.2ex}%
     {0.5ex \@plus .2ex}%
     {\reset@font\normalsize}}
\renewcommand\subparagraph{\@startsection{subparagraph}{5}{\parindent}%
     {1.5ex \@plus1ex \@minus .2ex}%
     {-1em}%
     {\reset@font\normalsize\bfseries}}


\def\l@section#1#2{\addpenalty{\@secpenalty} \addvspace{1.0em plus 1pt}
 \@tempdima 1.5em \begingroup
 \parindent \z@ \rightskip \@pnumwidth 
 \parfillskip -\@pnumwidth 
 \bfseries \leavevmode #1\hfil \hbox to\@pnumwidth{\hss #2}\par
 \endgroup}
\def\l@subsection{\@dottedtocline{2}{1.5em}{2.3em}}
\def\l@subsubsection{\@dottedtocline{3}{3.8em}{3.2em}}
\def\l@paragraph{\@dottedtocline{4}{7.0em}{4.1em}}
\def\l@subparagraph{\@dottedtocline{5}{10em}{5em}}
\@ifundefined{c@section}{\newcounter{section}}{}
\@ifundefined{c@chapter}{\newcounter{chapter}}{}
\newif\if@mainmatter 
\@mainmattertrue
\def\chaptername{Chapter}
\def\frontmatter{%
  \pagenumbering{roman}
  \def\thechapter{\@roman\c@chapter}
  \def\theHchapter{\roman{chapter}}
  \def\thesection{\@roman\c@section}
  \def\theHsection{\roman{section}}
  \def\@chapapp{}%
}
\def\mainmatter{%
  \cleardoublepage
  \def\thechapter{\@arabic\c@chapter}
  \setcounter{chapter}{0}
  \setcounter{section}{0}
  \pagenumbering{arabic}
  \setcounter{secnumdepth}{6}
  \def\@chapapp{\chaptername}%
  \def\theHchapter{\arabic{chapter}}
  \def\thesection{\@arabic\c@section}
  \def\theHsection{\arabic{section}}
}
\def\backmatter{%
  \cleardoublepage
  \setcounter{chapter}{0}
  \setcounter{section}{0}
  \setcounter{secnumdepth}{2}
  \def\@chapapp{\appendixname}%
  \def\thechapter{\@Alph\c@chapter}
  \def\theHchapter{\Alph{chapter}}
  \appendix
}
\newenvironment{bibitemlist}[1]{%
   \list{\@biblabel{\@arabic\c@enumiv}}%
       {\settowidth\labelwidth{\@biblabel{#1}}%
        \leftmargin\labelwidth
        \advance\leftmargin\labelsep
        \@openbib@code
        \usecounter{enumiv}%
        \let\p@enumiv\@empty
        \renewcommand\theenumiv{\@arabic\c@enumiv}%
	}%
  \sloppy
  \clubpenalty4000
  \@clubpenalty \clubpenalty
  \widowpenalty4000%
  \sfcode`\.\@m}%
  {\def\@noitemerr
    {\@latex@warning{Empty `bibitemlist' environment}}%
    \endlist}

\def\tableofcontents{\section*{\contentsname}\@starttoc{toc}}
\parskip0pt
\parindent1em
\def\Panel#1#2#3#4{\multicolumn{#3}{){\columncolor{#2}}#4}{#1}}
\newenvironment{reflist}{%
  \begin{raggedright}\begin{list}{}
  {%
   \setlength{\topsep}{0pt}%
   \setlength{\rightmargin}{0.25in}%
   \setlength{\itemsep}{0pt}%
   \setlength{\itemindent}{0pt}%
   \setlength{\parskip}{0pt}%
   \setlength{\parsep}{2pt}%
   \def\makelabel##1{\itshape ##1}}%
  }
  {\end{list}\end{raggedright}}
\newenvironment{sansreflist}{%
  \begin{raggedright}\begin{list}{}
  {%
   \setlength{\topsep}{0pt}%
   \setlength{\rightmargin}{0.25in}%
   \setlength{\itemindent}{0pt}%
   \setlength{\parskip}{0pt}%
   \setlength{\itemsep}{0pt}%
   \setlength{\parsep}{2pt}%
   \def\makelabel##1{\upshape ##1}}%
  }
  {\end{list}\end{raggedright}}
\newenvironment{specHead}[2]%
 {\vspace{20pt}\hrule\vspace{10pt}%
  \phantomsection\label{#1}\markright{#2}%

  \pdfbookmark[2]{#2}{#1}%
  \hspace{-0.75in}{\bfseries\fontsize{16pt}{18pt}\selectfont#2}%
  }{}
      \def\TheFullDate{2019-01-15 (revised: 15 January 2019)}
\def\TheID{\makeatother }
\def\TheDate{2019-01-15}
\title{Radiated Electromagnetic Interference(Emi) Mechanism of High Power Inverter}
\author{}\makeatletter 
\makeatletter
\newcommand*{\cleartoleftpage}{%
  \clearpage
    \if@twoside
    \ifodd\c@page
      \hbox{}\newpage
      \if@twocolumn
        \hbox{}\newpage
      \fi
    \fi
  \fi
}
\makeatother
\makeatletter
\thispagestyle{empty}
\markright{\@title}\markboth{\@title}{\@author}
\renewcommand\small{\@setfontsize\small{9pt}{11pt}\abovedisplayskip 8.5\p@ plus3\p@ minus4\p@
\belowdisplayskip \abovedisplayskip
\abovedisplayshortskip \z@ plus2\p@
\belowdisplayshortskip 4\p@ plus2\p@ minus2\p@
\def\@listi{\leftmargin\leftmargini
               \topsep 2\p@ plus1\p@ minus1\p@
               \parsep 2\p@ plus\p@ minus\p@
               \itemsep 1pt}
}
\makeatother
\fvset{frame=single,numberblanklines=false,xleftmargin=5mm,xrightmargin=5mm}
\fancyhf{} 
\setlength{\headheight}{14pt}
\fancyhead[LE]{\bfseries\leftmark} 
\fancyhead[RO]{\bfseries\rightmark} 
\fancyfoot[RO]{}
\fancyfoot[CO]{\thepage}
\fancyfoot[LO]{\TheID}
\fancyfoot[LE]{}
\fancyfoot[CE]{\thepage}
\fancyfoot[RE]{\TheID}
\hypersetup{citebordercolor=0.75 0.75 0.75,linkbordercolor=0.75 0.75 0.75,urlbordercolor=0.75 0.75 0.75,bookmarksnumbered=true}
\fancypagestyle{plain}{\fancyhead{}\renewcommand{\headrulewidth}{0pt}}

\date{}
\usepackage{authblk}

\providecommand{\keywords}[1]
{
\footnotesize
  \textbf{\textit{Index terms---}} #1
}

\usepackage{graphicx,xcolor}
\definecolor{GJBlue}{HTML}{273B81}
\definecolor{GJLightBlue}{HTML}{0A9DD9}
\definecolor{GJMediumGrey}{HTML}{6D6E70}
\definecolor{GJLightGrey}{HTML}{929497} 

\renewenvironment{abstract}{%
   \setlength{\parindent}{0pt}\raggedright
   \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}}
   \vskip16pt
   \textcolor{GJBlue}{\large\bfseries\abstractname\space}
}{%   
   \vskip8pt
   \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}}
   \vskip16pt
}

\usepackage[absolute,overlay]{textpos}

\makeatother 
      \usepackage{lineno}
      \linenumbers
      
\begin{document}

             \author[1]{Lingxiang  Deng}

             \author[2]{Pengfei  Li}

             \author[3]{Wanning  Bai}

             \author[4]{Jian  Chen}

             \author[5]{Juhao  Fang}

             \author[6]{Qiangqiang  Liu}

\renewcommand\Authands{ and }

\date{\small \em Received: 14 December 2018 Accepted: 31 December 2018 Published: 15 January 2019}

\maketitle


\begin{abstract}
        


In this paper, the generation mechanism of radiated EMI noise in inverter circuit is analyzed. On the basis of analyzing the equivalent model of common mode and differential mode radiated EMI noise, the radiated EMI noise is separated by common mode and differential mode by using the fast Fourier transform principle. The effectiveness of the radiated EMI noise separation method is verified by experiments. 

\end{abstract}


\keywords{high-power inverter, electromagnetic interference(emi), radiation emission (re), common mode radiation, }

\begin{textblock*}{18cm}(1cm,1cm) % {block width} (coords) 
\textcolor{GJBlue}{\LARGE Global Journals \LaTeX\ JournalKaleidoscope\texttrademark}
\end{textblock*}

\begin{textblock*}{18cm}(1.4cm,1.5cm) % {block width} (coords) 
\textcolor{GJBlue}{\footnotesize \\ Artificial Intelligence formulated this projection for compatibility purposes from the original article published at Global Journals. However, this technology is currently in beta. \emph{Therefore, kindly ignore odd layouts, missed formulae, text, tables, or figures.}}
\end{textblock*}


\let\tabcellsep& 	 	 		 \par
ith the rapid development of power electronics, inverter systems with highpower inverter power supply as the core are more and more widely used in large-scale power equipment \hyperref[b0]{[1]}\hyperref[b1]{[2]}\hyperref[b2]{[3]}\hyperref[b3]{[4]}\hyperref[b4]{[5]}.However, the increase of power density leads to the increasingly complex electromagnetic environment inside the inverter system \hyperref[b5]{[6]}\hyperref[b6]{[7]}\hyperref[b7]{[8]} {\ref [9]}\hyperref[b8]{[10]}.The resulting radiated electromagnetic interference can cause equipment failure and pose a potential hazard to the safe and reliable operation of itself and other surrounding equipment \hyperref[b9]{[11]}\hyperref[b10]{[12]}. Therefore, it is necessary to study the mechanism of radiated electromagnetic interference of high-power inverters \hyperref[b11]{[13]}.\par
The radiated EMI noise is generated by the inverter circuit and the loop equivalent antenna \hyperref[b12]{[14]}\hyperref[b13]{[15]}. The device under tested (EUT)is placed at the coordinates , the measured point is at x, and the length of the EUT equivalent radiating antenna is l, then the equivalent radiated antenna is measured. The distance between points can be expressed as Where R is the distance between the origin and the point to be measured, and n is the unit vector in the R direction. The wavelength corresponding to the radiation noise is\par
In the above formula, c is 3 × 10\textasciicircum 8m/s, ? is the wavelength corresponding to the radiation noise, and f is the frequency of the radiated EMI noise caused by the EUT.\par
Because the size of the high-power inverter power cabinet is 800mm × 500mm × 1500mm (width × depth × height), and according to the simulation calculation f is about 80kHz, ? is 3750m, the transmission control cabinet The size is obviously less than 1/10 of the wavelength of the radiation. It can be considered that the above radiation test condition is a small size characteristic, and the current density in the equivalent antenna is J, which can be derived.\par
A is a retarded potential, and k is the wave vector. The term in the denominator of (3) can be omitted, and will be expanded by\par
The first two parts of equation (  {\ref 4}) represent electric dipole common mode radiation and magnetic dipole differential mode radiation, respectively. 
\section[{II.}]{II.} 
\section[{Radiated EMI Noise Modeling a) Common mode EMI noise model}]{Radiated EMI Noise Modeling a) Common mode EMI noise model}\par
As shown in Fig. \hyperref[fig_0]{1}, for common mode radiation, it can be equivalent to an electric dipole antenna, and the delay potential is the first part of equation (4). c = f ? (2)\par
Author Jiangsu Institute of Metrology, Nanjing Jiangsu China. e-mail: 448221017@qq.com Author ? ? ? ¥ §: Nanjing Normal University, Nanjing, Jiangsu. China. e-mail: 1730312514@qq.com( ) 0 ( 4 jk R n x J x e A(x)= dV R n x ? ? ? ? ? ?? ? ? ? ? ? (3) n x ? ? ? jkn x e ? ? ? kn x ? ? . 0 ( )(1 ) 4 jkR e A(x)= J x jkn x dV ? ? ? ? ? ?? ? ? ? (4) 0 ( ) ( ) 4 j k eR e A x J x dV R ? ? ? ? ? ? (\textbf{5})\par
Global Journal of Researches in Engineering ( ) Volume XIX Issue III Version I 
\section[{Introduction : ?}]{Introduction : ?}\par
In the electric dipole antenna, there are ni particles with a velocity of vi and a charge of qi per unit volume. then Where is the first derivative of the electric dipole moment versus time.\par
Therefore, the magnetic field strength, electric field strength, energy flow density and radiation power of the electric dipole can be derived.\par
According to equation (  {\ref 8}) and Maxwell's equations, the calculated common mode radiated noise generated by the electric dipole at far field r is I CM is the common mode current in the electric dipole, l is the length of the electric dipole antenna, and r is the distance between the measured point and the center of the electric dipole. Therefore, equations (  {\ref 8}), (9), and (1) can describe the principle and model of electric dipole common mode radiation noise. 
\section[{b) Differential mode EMI noise model}]{b) Differential mode EMI noise model}\par
As shown in Fig. \hyperref[fig_2]{2}, for differential mode radiation, it can be equivalent to a magnetic dipole antenna, which delays the second part of the potential size formula (4). 
\section[{Fig. 2: Differential mode noise model}]{Fig. 2: Differential mode noise model}\par
The magnetic field strength, electric field strength, energy flow density and radiant power of the magnetic dipole antenna are From the equation ( \hyperref[formula_4]{11}) and the Maxwell equations, considering the grounding total reflection, the differential mode radiated noise of the magnetic dipole antenna at the far field r I DM is the differential mode current in the magnetic dipole, A is the area of the magnetic dipole antenna, and r is the distance between the measured point and the center of the electric dipole. Therefore, equations \hyperref[b9]{(11)}, \hyperref[b10]{(12)}, and Fig. \hyperref[fig_2]{2} can describe the principle and model of magnetic dipole differential mode radiated noise. 
\section[{III. Radiated EMI Noise Separation Miethod}]{III. Radiated EMI Noise Separation Miethod}\par
The second section of the above section establishes the electric dipole common mode radiation and the magnetic dipole differential mode radiation acoustic model, The nature of the radiated noise is analyzed when the radiated noise is suppressed. Therefore, this section designs a radiated noise separation method based on short-time fast Fourier transform and independent component analysis for common mode noise and differential mode noise electromagnetic characteristics. i i i i J n q v ? ? (6) i i P= q v ?\textbf{(7)}CM CM flI E r ? ? ? (9) 0 ( ) ( ) 4 jkR jk e A x = J x n x dV R ? ? ? ? ? ? ? ? (10) 0 2 ( ) 4 jkR DM e B A= m n n c R ? ? ? ? ? ? ? 0 ( ) 4 jkR DM e E cB A m n cR ? ? ? ? ? ? ? 2 4 0 2 2 3 2 sin 32 DM m S c R ? ? ? ? ? n 2 4 0 3 12 DM m P c ? ? ? ?\textbf{(11) 2 14}\par
2.632 10DM DM f AI E r ? ? ?\textbf{(12)}\par
Using the field probe to receive the radiated noise Z1(t),Z2(t),...ZN(t) of the N sets of EUTs, perform short-time fast Fourier transform on the acquired time domain signal Z(t) . Where ? (t) is the time window and * indicates its conjugate complex number. The time-rate energy distribution (instantaneous power spectral density) of the STFT is the square of the STFT(t, f) modulus.\par
The digital representation of the STFT can be derived from the equations (  {\ref 13}) and (  {\ref 14}).\par
Where N represents the amount of FFT data, and n and k represent the discrete time number of the time-frequency and the number of frequency grids, respectively. In the application, the fast algorithm of equation ( \hyperref[formula_6]{16}) is generally implemented by Fourier transform.\par
Through independent component analysis, the characteristics of the received noise signal are extracted, and then the short-time fast Fourier transform is used to convert the separated time domain noise signal into the frequency domain, and compared with the circuit under test, the source of the radiated electromagnetic interference noise is located. the specific method implementation steps are as follows: frequency detection range of 10 kHz to 2 GHz as shown in Fig.  {\ref 3}. The multi track high-speed oscilloscope uses the Tektronix DPO5204 model with a bandwidth of up to 2 GHz and four test channels with a sampling rate range of 5 GS/s -10 GS/s. In the experiment, the sampling rate of the oscilloscope DPO5204 is set to 1GS/s, and the EUT radiated noise time domain signal can be acquired. Firstly, the radiated noise mixed time domain signal of the high-power inverter power supply is collected. The measured near-field noise test result is shown in Fig. \hyperref[fig_6]{6}. After the noise signal is introduced into MATLAB, the time domain characteristics of the noise ( ) | ( ) | SPEC t f STFT t f ? ? ? (14) 1 1 0 2 ( ) [ ( )]exp( ) N i ki STFT n k = x i-n j N ? ? ? ? ? ? ? ? (15) 2 ( ) | ( ) | SPEC n k STFT t f ? ? ?\textbf{(16)} 
\section[{IV. Radiated EMI Noise Separation Experiment}]{IV. Radiated EMI Noise Separation Experiment}\par
This verification experiment uses a multi track high speed oscilloscope to measure the radiated noise time domain signal of the EUT through a mufti channel test port with a near-field magnetic field probe, as shown in Fig.  {\ref 3}.\par
The near-field magnetic field probe uses Rhode \& Schwarz's near-field probe set HZ-11, which has a signal are shown in Fig. \hyperref[fig_6]{6} (a). Perform independent component analysis, as shown in Fig. \hyperref[fig_6]{6(b}). There are two independent noise signals Z1(t) and Z2(t). The timefrequency analysis is shown in Fig. \hyperref[fig_7]{7}. As can be seen from Fig. \hyperref[fig_7]{7}(a), the data with the strongest energy in the noise is extracted as shown in Table \hyperref[tab_0]{1}. The average value of the data in the table is about 240 MHz. It can be seen that the noise is strongest around 240 MHz, and the internal inverse is observed. The variable circuit found that the crystal frequency of the control board is 30MHz, and 240MHz is its frequency multiplication, so the noise is the radiation noise generated by the 30MHz crystal oscillator. As seen in Fig. \hyperref[fig_7]{7}(b), the noise is the strongest at 300KHz, and the noise signal data at the strongest energy is extracted as shown in Table \hyperref[tab_1]{2}. The average value is 299.85KHz, which is compared with the internal inverter circuit. The power master chip operates at a frequency of 100 kHz and 300 kHz as its frequency multiplier. Therefore, the noise after the separation is the radiation noise of the 100 KHz master chip. It can be seen that the radiation noise of the device is mainly generated by the 30M crystal oscillator and the 100KHz main control chip.  \hyperref[tab_1]{1 and 2}, the energy intensity of the 30MHz noise signal is stronger in the noise signals after separation between the two groups. Therefore, the 30MHz noise signal is the main cause of the radiation noise exceeding the standard of the device under test. From the above analysis, the 30MHz crystal oscillator is large. The main reason for the excessive radiation noise of the power inverter power supply cabinet provides a theoretical basis for the suppression of subsequent radiation noise.   
\section[{Conclusion}]{Conclusion}\par
In short, the mechanism of radiated EMI noise generation in inverter circuit has been analyzed, and the method of common mode and differential mode separation of radiated EMI noise by using the principle of fast Fourier transform is proposed. The effectiveness of the method of radiating EMI noise separation is verified by experiments. Sex. As a result, a better solution to EMI noise can be proposed.\begin{figure}[htbp]
\noindent\textbf{1}\includegraphics[]{image-2.png}
\caption{\label{fig_0}Fig. 1 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2}\includegraphics[]{image-3.png}
\caption{\label{fig_2}2 (}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{}\includegraphics[]{image-4.png}
\caption{\label{fig_3}}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{345}\includegraphics[]{image-5.png}
\caption{\label{fig_4}Fig. 3 :Fig. 4 :Fig. 5 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2}\includegraphics[]{image-6.png}
\caption{\label{fig_5}2}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{6}\includegraphics[]{image-7.png}
\caption{\label{fig_6}Fig. 6 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{7}\includegraphics[]{image-8.png}
\caption{\label{fig_7}Fig. 7 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{1} \par 
\begin{longtable}{}
\end{longtable} \par
 
\caption{\label{tab_0}Table 1 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2} \par 
\begin{longtable}{}
\end{longtable} \par
 
\caption{\label{tab_1}Table 2 :}\end{figure}
 			\footnote{Year 2019 F © 2019 Global Journals I.} 			\footnote{© 2019 Global Journals} 			\footnote{Radiated Electromagnetic Interference(Emi) Mechanism Of High Power Inverter} 		 		\backmatter  			  				\begin{bibitemlist}{1}
\bibitem[He et al. ()]{b6}\label{b6} 	 		\textit{Analysis of the effect of stray magnetic field on conductionCSEE},  		 			J P He 		,  		 			W Chen 		,  		 			J G Jiang 		.  		2005. 25 p. .  	 
\bibitem[Qian and Cheng ()]{b10}\label{b10} 	 		\textit{Electromagnetic Interference Design and Interference Suppression Technology for Power Electronic Systems},  		 			Z M Qian 		,  		 			W J Cheng 		.  		2000. Zhejiang University Press. p. .  	 
\bibitem[Qian et al. ()]{b11}\label{b11} 	 		‘EMC Design of High Power Converters’.  		 			G L Qian 		,  		 			Z Y Lu 		,  		 			X N He 		.  	 	 		\textit{Proceedings of the 14th National Conference on Power Technology},  				 (the 14th National Conference on Power Technology)  		2001. p. .  	 
\bibitem[Zhang et al. ()]{b9}\label{b9} 	 		‘Full-Bridge Circuit Common Mode Suppression Technology Based on Drive Pulse Self-Calibration’.  		 			K Zhang 		,  		 			Z Y Liu 		,  		 			X J Qi 		.  	 	 		\textit{Proceedings of the CSEE},  				 (the CSEE)  		2007. 27 p. .  	 
\bibitem[GB T 17626-2006. Electromagnetic Compatibility Test Methods and Testing Techniques ()]{b2}\label{b2} 	 		\textit{GB T 17626-2006. Electromagnetic Compatibility Test Methods and Testing Techniques},  				2006.  	 
\bibitem[Yuan and Qian ()]{b3}\label{b3} 	 		‘Modeling of Power MOSFETs for Conducting EMI’.  		 			Y S Yuan 		,  		 			G L Qian 		.  	 	 		\textit{Journal of Zhejiang University (Engineering Science)}  		2003. 37  (2)  p. .  	 
\bibitem[Sarikhani et al. ()]{b14}\label{b14} 	 		‘Optimum Equivalent Models of Multi-source Systems for the Study of Electromagnetic Signatures and Radiated Emissions From Electric Drives’.  		 			A Sarikhani 		,  		 			M Barzegaran 		,  		 			O A Mohammed 		.  	 	 		\textit{IEEE Transactions on Magnetics Mag}  		2012. 48  (2)  p. .  	 
\bibitem[He et al. ()]{b5}\label{b5} 	 		‘Research on Common Mode Conducted Interference Model of Switching Power Supply’.  		 			J P He 		,  		 			W Chen 		,  		 			J G Jiang 		.  	 	 		\textit{Proceedings of the CSEE},  				 (the CSEE)  		2005. 25 p. .  	 
\bibitem[Zhou ()]{b7}\label{b7} 	 		\textit{Research on Common Mode EMI Analysis and Active Suppression Technology for Single-Phase Inverter},  		 			Y B Zhou 		.  		2006.  		 			Huazhong University of Science and Technology 		 	 	 (factor correction circuit. Proceedings of the) 
\bibitem[Zhang et al. ()]{b8}\label{b8} 	 		‘Research on common mode equivalent circuit of single-phase full-bridge inverter’.  		 			K Zhang 		,  		 			H S Fang 		,  		 			Y B Zhou 		.  	 	 		\textit{Transactions of China Electrotechnical Society}  		2007. 22  (2)  p. .  	 
\bibitem[Peng and Tang ()]{b12}\label{b12} 	 		‘Research on Electromagnetic Compatibility of Transmission System’.  		 			Y B Peng 		,  		 			Y Q Tang 		.  	 	 		\textit{Electric Drive},  				2007. 16 p. .  	 
\bibitem[Zhang ()]{b13}\label{b13} 	 		\textit{Research on Electromagnetic Interference and Suppression of Electric Vehicle Motor Inverter System},  		 			X Y Zhang 		.  		2016.  		 			Beijing Institute of Technology 		 	 
\bibitem[Su and Li ()]{b0}\label{b0} 	 		‘Researchon Eliminating Highorder Harmonics of Inverter Output Voltage’.  		 			K C Su 		,  		 			J Li 		.  	 	 		\textit{Journal of South China University of Technology(Natural Science Edition)}  		1991. 19  (1)  p. .  	 
\bibitem[Specification and Measurement Methods for Radio Disturbance and Immunity Measurement Equipment ()]{b1}\label{b1} 	 		\textit{Specification and Measurement Methods for Radio Disturbance and Immunity Measurement Equipment},  		 GB T 6113-2008.  		2008.  	 
\bibitem[Hertz ()]{b4}\label{b4} 	 		\textit{Thermal and EMI Modeling and Analysis of a Boost PFC Circuit Designed Using a Genetic-Based Optimization},  		 			E Hertz 		.  		2001. Virginia Tech.  	 
\end{bibitemlist}
 			 		 	 
\end{document}
