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    1. 電源濾波器相關常識

      2016-07-04  來自: 上海上恒電子有限公司 瀏覽次數:3915

      額定電壓

       額定電壓是指在規定頻率及工作溫度范圍內可以連續施加在濾波器上的電壓值。

      額定電流

        額定電流是指在規定頻率及電壓下,環境溫度為 40 ℃時濾波器可通過的安全允許電流。

      試驗電壓

      試驗電壓也就是通常的耐壓測試,以檢驗濾波器的絕緣特性及內部元件的耐高壓能力。測試時,電壓從零開始,以不超過 150V/S 的速率升至規定的試驗電壓值,開始計時。通常有兩種規范,一種是典型測試,時間為 60 秒。另一種為產品測試,時間為 3 秒。詳細資料可參照IEC相關文件。

      絕緣電阻

      絕緣電阻是指濾波器相線、中線對地之間的阻值。通常用專用絕緣電阻表測試。

      最大泄漏電流

      泄漏電流是指濾波器相線、中線對地(外殼)在給定電壓及頻率下流過的最大電流(通常在 250VAC/50Hz下測量)。為保證安全,對不同類型、不同應用場合的濾波器,此項指標有不同規定。一般用戶不具有測量單路泄漏電流的裝置,測試值為整體濾波器的數值,應加以修正。

      溫升  

       一般指標為:Δ t < 30 ℃。

      插入損耗

       插入損耗是衡量濾波器濾波效果的指標,通常以分貝數或頻率特性曲線來表示。它是指濾波器接入線路前后,電源傳給負載的功率比或端口電壓比。 IL=10Ig Po/P2 (dB) 或 IL=20Ig Vo/V2 (dB), s Po、P2、 Vo、V2分別表示濾波器接入前后負載端的功率和電壓。實驗室測量一般在50/50Ω系統下進行。  

      干擾形式

      要了解傳導干擾的相關問題,就必須了解傳導信號的 2 種模式:共模型式和差模型式。差模干擾(也稱對稱干擾),指在系統相線中的干擾信號,差模電流從一條相線進入,從另一條相線流出,與地線無關。共模干擾(也稱不對稱干擾),它會在每條相線、中線與大地之間產生一個電壓,共模電流從干擾源流向地線,又從地線返回相線。

      氣候類別

      阻抗關系

        傳統上,在濾波器兩端的端接阻抗為 50 Ω的器件下描述濾波器的特性,因為這對于測試很方便,并且是符合射頻標準的。但在實際應用中,ZS 和 ZL 非常復雜,并且在要抑制的頻率點上可能是未知的。如果濾波器一端或兩端與電抗性元件相連接,則可能會產生諧振,使某些頻率點上的插入損耗變為插入增益。如果構成源或負載的器件的高頻特性可能明確給出,則差模阻抗可以預測出,但由電纜或結構件的寄生電抗構成的共模阻抗則基本上是無法預測的。


      關鍵詞: 電源濾波器相關常識           

      上海上恒電子有限公司,專營 單相濾波器 三相三線濾波器 三相四線濾波器 直流濾波器 軍品濾波器 電抗器 正弦波濾波器 等業務,有意向的客戶請咨詢我們,聯系電話:021-52845231.

      備案號:滬ICP備16046008號

      CopyRight ? 版權所有: 上海上恒電子有限公司 技術支持:魔站 網站地圖 XML


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