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    DTSF、DSSF三相電子式多費率電能表工作原理

    2014/3/11 8:29:28      點擊:

    DTSF、DSSF三相電子式多費率電能表 工作原理2.1 電能計量單元工作原理本儀表電能計量單元的核心是ADE7755芯片。被計量的每一相電能的電流通過互感器采樣得到電壓信號,再通過ADE7755芯片內(nèi)部的差放電路將電壓信號放大,放大的信號經(jīng)過A/D轉(zhuǎn)換成與其成比例的數(shù)字信號,再經(jīng)過高通濾波去除信號中的直流分量后進入數(shù)字乘法器的一個輸入端。被計量的電能電壓信號經(jīng)過電阻分壓取樣,通過ADE7755芯片內(nèi)部的差放電路將信號放大,再經(jīng)過A/D轉(zhuǎn)換成與其成比例的數(shù)字信號,進入數(shù)字乘法器的另一個輸入端與電流通道的信號進行乘法運算,完成計量電能的瞬時功率測量。每相輸出瞬時功率通過數(shù)字低通濾波器,進行積分處理,然后進行絕對值累加后進入"數(shù)字/頻率"轉(zhuǎn)換器,經(jīng)過分頻電路輸出的脈沖經(jīng)過隔離后送入CPU單元進行處理。2.2 CPU單元工作原理電能計量單元輸出的高頻脈沖通過光電耦合器,一路作為無源脈沖輸出用于出廠檢驗和用戶對電能表進行校驗;另一路送到CPU芯片進行數(shù)據(jù)處理。CPU在系統(tǒng)(電能表程序)指令下,根據(jù)數(shù)據(jù)存儲器中的記憶及儀表常數(shù)計算出有功的電量值,再轉(zhuǎn)存到內(nèi)部存儲器中,存儲的數(shù)據(jù)既可以通過液晶LCD顯示, 又可以通過紅外和RS485兩種通迅方式輸出。

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