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    電磁兼容性配件正確選擇和使用



    在復雜的電磁環境中,每臺電子、電氣產品除了本身要能抗住一定的外來電磁干擾正常工作以外,還不能產生對該電磁環境中的其它電子、電氣產品所不能承受的電磁干擾。或者說,既要滿足有關標準規定的電磁敏感度極限值要求,又要滿足其電磁發射極限值要求,這就是電子、電氣產品電磁兼容性應當解決的問題,也是電子、電氣產品通過電磁兼容性認證的必要條件。很多企業在進行產品

    電磁兼容性設計時,對于如何正確選擇和使用電磁兼容性元器件,往往束手無策或效果不理想,因此,很有必要對此進行探討。

    模擬與邏輯有源器件的選用

    電磁干擾發射和電磁敏感度的關鍵是模擬與邏輯有源器件的選用。必須注意有源器件固有的敏感特性和電磁發射特性。

    有源器件可分為調諧器件和基本頻帶器件。調諧器件起帶通元件作用,其頻率特性包括:中心頻率、帶寬、選擇性和帶外亂真響應;基本領帶器件起低通元件作用,其頻率特性包括:截止頻率、通帶特性、帶外抑制特性和亂真響應。此外還有輸入阻抗特性和輸入端的平衡不平衡特性等。

    模擬器件的敏感度特性取決于靈敏度和帶寬,而靈敏度以器件的固有噪聲為基礎。

    邏輯器件的敏感度特性取決于直流噪聲容限和噪聲抗擾度。

    有源器件有兩種電磁發射源:傳導干擾通過電源線、接地線和互連線進行傳輸,并隨頻率增加而增加;輻射干擾通過器件本身或通過互連線進行輻射,并隨頻率的平方而增加。瞬態地電流是傳導干擾和輻射干擾的初始源,減少瞬態地電流必須減小接地阻抗和使用去耦電容。電磁兼容性元器件

    邏輯器件的翻轉時間越短,所占頻譜越寬。為此,應當在保證實現功能的前提下,盡可能增加信號的上升/下降時間。

    數字電路是一種最常見的寬帶干擾源,其電磁發射可分為差模和共模兩種形式。

    為了減少發射,應盡可能降低頻率和信號電平;為了控制差模輻射,必須將印制電路板上的信號線、電源線和它們的回線緊靠在一起,減小回路面積;為了控制共模輻射,可以使用柵網地線或接地平面,也可使用共模扼流圈。同時,選擇“干凈地”作為接地點也是十分重要的。

    表面安裝技術(SMT)70年代末發展起來的新型電子裝聯技術,內容包括表面安裝器件(SMD)、表面安裝元件(SMC)、表面安裝印制電路板(SMB)以及表面安裝設備、在線測試等。

    電子整機應用SMT最多的是計算機,其次是通訊、軍用、消費類電子產品。

    90年代SMT發展了一種新型電路基板,可用來制作多芯片組件MCM。目前片式集成電路的輸入/輸出端口已增加到上百個,引腳的中心間距已減小到03毫米。目前表面安裝技術正在和微組裝技術互相交錯和滲透。由于SMDSMC的超小型化,使基板焊區尺寸減小到I平方英寸以內,無論電磁發射還是電磁敏感度問題,都可以得到很好的解決。

    電磁屏蔽材料的選用

    具有較高導電、導磁特性的材料可以用作屏蔽材料。常用的有鋼板、鋁板、鋁箔、銅板、銅箔等。也可以在塑料機箱上噴涂鎳漆或銅漆的方法實現屏蔽。

    屏蔽機箱的屏蔽效能除了與所選屏蔽材料的導電率、導磁率和厚度有關外,在很大程度上還依賴于機箱的結構,即其導電連續性。任何實用的屏蔽機箱上都有縫隙,這些縫隙是由于屏蔽板之間臨時性搭接所造成的。由于縫隙的導電不連續性,在縫隙處會產生電磁泄漏。因此,對于永久性搭接,可以使用焊接的方法消除縫隙。如果使用鉚接或螺釘連接,間距必須足夠小。對于非永久性搭接,采用電磁密封襯墊等屏蔽材料則是十分有效的手段。

    電磁兼容性元器件1.電磁密封襯墊

    電磁密封襯墊是一中彈性好、導電性高的材料。將這種材料填充在縫隙處,能保持導電連續性,是解決縫隙電磁泄漏的好方法。在選用電磁密封襯墊時,需要熟悉以下特性參數:

    轉移阻抗設襯墊和兩側屏蔽板的接合面上流過電流I,而兩側屏蔽板之間的電壓為V,則轉移阻抗定義為ZrVI。轉移阻抗越低,則兩側屏蔽板之間的電磁泄漏越小,加襯墊后該縫隙的屏蔽效能越高。

    硬度襯墊的硬度應當適中,硬度太低,易造成接觸不良,屏蔽效能較低;硬度太高,需要較大的壓力,給結構設計造成困難。

    壓縮永久形變襯墊只有在外力作用下發生一定的形變時,才有屏蔽作用。當外力去掉后,襯墊不會完全恢復到原來的形狀,即發生了永久形變。當然,襯墊的壓縮永久形變越小越好。

    襯墊厚度襯墊的厚度應能滿足接觸面不平整度的要求,利用其彈性,將縫隙填充滿,達到導電連續性的目的。

    常用的電磁密封襯墊有以下幾種類型:

    金屬絲網襯墊用金屬絲編織成的彈性網套,為純金屬接觸,接觸電阻低;但金屬絲在高頻時會呈現較大感抗,使屏蔽效能降低。所以只適用于l吉赫以下的頻率范圍。

    橡膠芯編織網套將金屬絲編織的網套套在發泡橡膠芯或硅橡膠芯上,具有很好的彈性和導電性。

    導電橡膠襯墊在硅橡膠內填充金屬顆粒或金屬絲,構成導電的彈性物質。由于導電橡膠中的導電顆粒之間的容抗在高頻時會降低,因此,填充金屬顆粒在高頻時屏蔽效能較高。如果填充方向一致的金屬絲,還可以做到純金屬接觸,但由于金屬絲在高頻時呈現較大感抗,使屏蔽效能降低,所以填充金屬絲時只適用于低頻。

    鈹銅指形簧片利用被銅良好的導電性和彈性,可制成各種指形簧片。由于純金屬接觸,直流電阻低,感抗又小,所以低頻和高頻時都具有較高的屏蔽效能。

    螺旋管襯墊用鍍錫被銅或不銹鋼做成的螺旋管,具有良好的彈性和導電性,是目前屏蔽效能最高的襯墊。

    2.導電化合物

    導電化合物包括各種導電膠和各種導電填充物等。環氧導電膠可用于金屬之間,金屬與非金屬之間,各種硬性表面之間的導電粘接。可代替焊錫,完成微波器件引線連接;可修復印制板線路,可用于導電陶瓷粘接,天線元件粘接,玻璃除霜粘接,導電/導熱粘接,微波波導部件粘接等。硅脂導電膠用于將彈性的導電橡膠粘接固定在金屬表面上,可應用于航天、航空、軍用等電子設備中。導電填充物是一種高導電漿糊狀材料,用于無法加裝屏蔽襯墊的縫隙處,固化后仍保持彈性。

    電磁兼容性元器件3.截止波導通風板

    屏蔽機箱的通風口及其它開口都是主要的電磁輻射源。采用開小孔或加金屬絲網的方法都難以達到滿意的屏蔽效能。理論證明,當金屬管截面尺寸滿足一定條件時,可以傳輸一定頻率范圍的電磁波,稱為波導管。而波導管存在一個截止頻率,當頻率低于截止頻率時,電磁波被截止而不能傳輸。根據這個原理可以設計成截止波導管。截止波導通風板由許多截止波導管依次排列組成,為了提高通風效率,每個截止波導管的截面都設計為六角形,故又稱蜂窩狀通風板。當屏蔽效能要求很高時,可用兩塊截止波導通風板構成雙層通風板。而通風板材料的導電率是屏蔽效能的重要因素,采用高導電率材料或鍍層的通風板可以得到高屏蔽效能。電磁兼容性元器件

    4.導電玻璃和導電膜片

    顯示屏或顯示窗口既要滿足視覺要求,又要滿足防電磁輻射的要求,為此,可選用導電玻璃實現屏蔽。導電玻璃可用兩塊光學玻璃中間夾金屬絲網構成,金屬絲網的密度越大,屏蔽效能就越高,但透光性變得越差。導電玻璃也可由光學玻璃或有機玻璃表面鍍的金屬薄膜構成。此外,還可以在透明聚脂膜片上鍍以金屬薄膜,制成柔性透明導電膜片。這種膜片的透光性可達70(80%,而且膜片很薄,僅013mm,可以直接貼覆在常規玻璃或有機玻璃表面,特別適用于要求高透明度和中等屏蔽效能的儀表表盤、液晶顯示器、面板指示燈孔、彩色顯示器等部位。

    電磁干擾濾波器的選用

    實踐表明,即使對一個經過很好設計并且具有正確的屏蔽和接地措施的產品,也仍然會有傳導干擾發射或傳導干擾進入產品。濾波是壓縮干擾頻譜的一種有效方法,當干擾頻譜不同于有用信號的頻帶時,可以用電磁干擾濾波器將無用的干擾濾除。因此,恰當地選擇和正確地使用濾波器對抑制傳導干擾是十分重要的。從頻率選擇的角度出發,電磁干擾濾波器屬于低通濾波器,分為信號線濾波器和電源線濾波器等。

    1.信號線濾波器

    信號線濾波器是用在各種信號線上的低通濾波器,用來濾除高頻干擾成分。可分為線路板濾波器、饋通濾波器和連接器濾波器等三種。線路板濾波器適合于安裝在線路板上,具有成本低、安裝方便等優點;饋通濾波器適合于安裝在屏蔽殼體上,特別適用于單根導線或電纜穿過屏蔽體時使用;濾波器連接器適用于多根導線或電纜穿過屏蔽體時使用。濾波器連接器在外形上和尺寸上都和普通連接器相同,兩者完全可以互換。但濾波器連接器的每個針或孔上都有一個低通濾波器,它的電路可以是單個電容的,也可以是L型或π型的。

    選用信號線濾波器時,應根據使用的場合,選擇濾波器的類型,根據濾波要求選擇濾波器的電路和性能指標,為了保證信號頻率順利通過濾波器,濾波器的截止頻率應高于信號頻率的上限。此外,還應正確選擇濾波器的工作電壓、電流、溫度范圍等。在使用信號線濾波器時,最重要的是保證濾波器有良好的接地,接地線應盡量短。濾波器外殼應與屏蔽體有良好的電接觸,可以使用焊接方式或采用射頻電磁密封襯墊。

    新研制的濾波器陣列板是將濾波器制成微形器件,并排列成陣列,能快速安裝到電子產品的底板或隔斷上,以實現密封或隔離。

    2.鐵氧體電磁干擾抑制元件

    鐵氧體是一種立方晶格結構的亞鐵磁性材料。它的制造工藝和機械性能與陶瓷相似,顏色為灰黑色。對于抑制電磁干擾用的鐵氧體,最重要的性能參數為磁導率μ和飽和磁通密度Bs。磁導率μ可以表示為復數,實數部分構成電感,虛數部分代表損耗,隨著頻率的增加而增加。因此,它的等效電路為由電感L和電阻R組成的串聯電路,LR都是頻率的函數。例如磁導率為850的鐵氧體,在10MHz時阻抗小于10Ω,而超過l00MHz后阻抗大于100Ω,使高頻干擾大大衰減。這樣,就構成了一個低通濾波器。低頻時R很小,L起主要作用,電磁干擾被反射而受到抑制;高頻時R增大,電磁干擾被吸收并轉換成熱能。

    鐵氧體抑制元件廣泛應用于印制電路板、電源線和數據線上。例如在印制板的電源線入口端加上鐵氧體抑制元件,就可以濾除高頻干擾。鐵氧體磁環或磁珠專用于抑制信號線、電源線上的高頻干擾和尖峰干擾,它也具有吸收靜電放電脈沖干擾的能力。

    不同的鐵氧體抑制元件,有不同的最佳抑制頻率范圍。通常磁導率越高,抑制的頻率就越低。此外,鐵氧體的體積越大,抑制效果越好。在體積一定時,長而細的形狀比短而粗的抑制效果好,內徑越小抑制效果也越好。但在有直流或交流偏流的情況下,還存在鐵氧體飽和的問題,抑制元件橫截面越大,越不易飽和,可承受的偏流越大。電磁兼容性元器件鐵氧體抑制元件應當安裝在靠近干擾源的地方。對于輸入/輸出電路,則應盡量靠近屏蔽殼的進、出口處。安裝時還應當注意,鐵氧體元件易破碎,應采取可靠的固定措施。

    3.電源線濾波器

    電源線是電磁干擾傳入設備和傳出設備的主要途徑。為防止這兩種情況的發生,必須在設備的電源接口安裝電源線濾波器。它只允許電源頻率通過,而高于電源頻率的電磁干擾卻受到很大的衰減。

    電源線上的干擾以兩種形式出現,在火線、零線回路中的干擾為差模干擾,在火線、零線與地線回路中的干擾為共模干擾。雖然電源線濾波器對差模干擾和共模干擾都有抑制作用,但效果不一樣,應分別給出兩者的插入損耗。除了特別說明允許不接地的濾波器外,所有電源濾波器都必須接地,因為濾波器中的共模旁路電容只有接地時才起作用。

    使用電源濾波器時,應盡量靠近電源入口處安裝,并使濾波器的輸入/輸出端之間屏蔽隔離,避免電磁干擾從輸入端直接耦合到濾波器的輸出端。此外,濾波器的接地點還應盡量靠近設備的接地點。電源線濾波器的技術指標包括:最大泄漏電流、耐壓、額定工作頻率、額定工作電壓、額定工作電流和溫度范圍等。電磁兼容性元器件是解決電磁干擾發射和電磁敏感度問題的關鍵,正確選擇和使用這些元器件是做好電磁兼容性設計的前提。因此,我們必須深入掌握這些元器件,這樣才有可能設計出符合標準要求、性能價格比最優的電子、電氣產品。

    更多文章請點擊www.dghuanyi.com。

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