基于NLPCA和JADE算法的EMI輻射源噪聲診斷方法研究
發(fā)布時(shí)間：2018-09-11 20:29
【摘要】：隨著大規(guī)模集成電路、高頻開關(guān)元件以及無線通訊模塊在電子設(shè)備中的廣泛使用,大量電子輻射噪聲隨之產(chǎn)生,并以空間電磁場的形式向外傳播,不僅影響設(shè)備自身的正常工作,而且還會(huì)通過電磁場輻射的形式干擾外部設(shè)備的工作。目前的電磁兼容問題分析方法大多是從理論和建模方面分析輻射問題,并不能對噪聲源特征進(jìn)行判定和診斷,且由于模型的理想化,導(dǎo)致了結(jié)果與實(shí)際有著一定的誤差,因此復(fù)雜電子設(shè)備電磁輻射噪聲源的識別和診斷成為了電磁兼容輻射分析中的一大挑戰(zhàn)。針對上述問題,本文研究了“基于NLPCA和JADE算法的EMI輻射源噪聲診斷方法研究”,具體包含以下內(nèi)容:(1)從天線輻射理論出發(fā),通過對復(fù)雜電子設(shè)備輻射機(jī)理的分析,針對實(shí)際電路中輻射線纜長度為電大尺寸時(shí)信號傳播存在時(shí)延以及線路阻抗失配時(shí)電路存在反向行波這兩種情況建立了適用性廣泛的輻射卷積噪聲模型。(2)研究復(fù)雜電子設(shè)備多輻射源的定位方法。利用NLPCA和JADE算法分別從信號的時(shí)域和頻域角度對多輻射源輻射噪聲進(jìn)行分析,獲得若干個(gè)獨(dú)立的噪聲信號,作為輻射噪聲超標(biāo)源頭的備選信號。利用功率譜對分離后的獨(dú)立輻射電磁干擾噪聲信號進(jìn)行分析,提取出各信號的頻率特征,通過與PCB板的疑似輻射源進(jìn)行比對,從而診斷出引起輻射超標(biāo)的主要原因。(3)進(jìn)行三組驗(yàn)證性實(shí)驗(yàn),通過對雙共模模型、雙差模模型和共差模混合模型的噪聲信號盲分離,并對分離后的獨(dú)立信號進(jìn)行能量頻譜分析,找出輻射超標(biāo)的原因,驗(yàn)證了該定位方法的可行性。最后通過兩個(gè)實(shí)際的復(fù)雜電子產(chǎn)品進(jìn)行案例分析,驗(yàn)證了該方法實(shí)際應(yīng)用的有效性,成功找出了輻射超標(biāo)的原因,并根據(jù)超標(biāo)原因采取對應(yīng)的整改,使電子設(shè)備通過國標(biāo)測試。通過理論的分析研究和實(shí)驗(yàn)結(jié)果的驗(yàn)證,本文提出的定位方法對復(fù)雜電子設(shè)備的電磁兼容多輻射源信號分離研究有著重要的借鑒價(jià)值,而且對電磁兼容的整改工作有著積極的指導(dǎo)意義。
[Abstract]:With the widespread use of large scale integrated circuits, high-frequency switching elements and wireless communication modules in electronic devices, a large amount of electronic radiation noise is generated and propagates outward in the form of space electromagnetic fields. It not only affects the normal operation of the equipment itself, but also interferes with the work of the external equipment through electromagnetic radiation. At present, most of the analysis methods of EMC are based on theory and modeling, which can not judge and diagnose the characteristics of noise source, and because of the idealization of the model, there is a certain error between the results and the reality. Therefore, the identification and diagnosis of electromagnetic radiation noise sources in complex electronic equipment has become a major challenge in EMC radiation analysis. In order to solve the above problems, this paper studies the method of noise diagnosis of EMI radiation source based on NLPCA and JADE algorithm, which includes the following contents: (1) based on the antenna radiation theory, the radiation mechanism of complex electronic equipment is analyzed. In this paper, a widely applicable radiation convolution noise model is established for the real circuit in which the signal propagation delay exists when the length of the radiation cable is electrically large and the circuit has reverse traveling wave when the line impedance mismatches. (2) the complex convolution noise model is studied. Location method of multiple radiation sources for miscellaneous electronic equipment. NLPCA and JADE algorithms are used to analyze the radiated noise of multiple radiation sources in the time domain and frequency domain respectively, and several independent noise signals are obtained, which are used as alternative signals for the radiation noise to exceed the standard source. The independent radiated electromagnetic interference (EMI) noise signal after separation is analyzed by power spectrum, and the frequency characteristics of each signal are extracted, and compared with the suspected radiation source of the PCB board. Thus, the main causes of radiation exceeding the standard are diagnosed. (3) three groups of confirmatory experiments are carried out. The noise signals of the two common mode models, the double differential modes model and the common-difference mode mixed model are separated blindly, and the energy spectrum of the separated independent signals is analyzed. The reason of radiation exceeding the standard is found, and the feasibility of this method is verified. Finally, through the case analysis of two real complex electronic products, the validity of the method is verified, the reason of radiation exceeding the standard is found out successfully, and the corresponding rectification is taken according to the reason of exceeding the standard, so that the electronic equipment can pass the national standard test. Based on the theoretical analysis and experimental results, the localization method proposed in this paper has important reference value for the study of EMC multi-emitter signal separation in complex electronic equipment. Moreover, it has positive guiding significance to the rectification and reform of EMC.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN03
本文編號：2237768
[Abstract]:With the widespread use of large scale integrated circuits, high-frequency switching elements and wireless communication modules in electronic devices, a large amount of electronic radiation noise is generated and propagates outward in the form of space electromagnetic fields. It not only affects the normal operation of the equipment itself, but also interferes with the work of the external equipment through electromagnetic radiation. At present, most of the analysis methods of EMC are based on theory and modeling, which can not judge and diagnose the characteristics of noise source, and because of the idealization of the model, there is a certain error between the results and the reality. Therefore, the identification and diagnosis of electromagnetic radiation noise sources in complex electronic equipment has become a major challenge in EMC radiation analysis. In order to solve the above problems, this paper studies the method of noise diagnosis of EMI radiation source based on NLPCA and JADE algorithm, which includes the following contents: (1) based on the antenna radiation theory, the radiation mechanism of complex electronic equipment is analyzed. In this paper, a widely applicable radiation convolution noise model is established for the real circuit in which the signal propagation delay exists when the length of the radiation cable is electrically large and the circuit has reverse traveling wave when the line impedance mismatches. (2) the complex convolution noise model is studied. Location method of multiple radiation sources for miscellaneous electronic equipment. NLPCA and JADE algorithms are used to analyze the radiated noise of multiple radiation sources in the time domain and frequency domain respectively, and several independent noise signals are obtained, which are used as alternative signals for the radiation noise to exceed the standard source. The independent radiated electromagnetic interference (EMI) noise signal after separation is analyzed by power spectrum, and the frequency characteristics of each signal are extracted, and compared with the suspected radiation source of the PCB board. Thus, the main causes of radiation exceeding the standard are diagnosed. (3) three groups of confirmatory experiments are carried out. The noise signals of the two common mode models, the double differential modes model and the common-difference mode mixed model are separated blindly, and the energy spectrum of the separated independent signals is analyzed. The reason of radiation exceeding the standard is found, and the feasibility of this method is verified. Finally, through the case analysis of two real complex electronic products, the validity of the method is verified, the reason of radiation exceeding the standard is found out successfully, and the corresponding rectification is taken according to the reason of exceeding the standard, so that the electronic equipment can pass the national standard test. Based on the theoretical analysis and experimental results, the localization method proposed in this paper has important reference value for the study of EMC multi-emitter signal separation in complex electronic equipment. Moreover, it has positive guiding significance to the rectification and reform of EMC.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN03
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