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| 添加時間： | 2016-08-21 14:41:10 |
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PT03c 電壓傳感器的產品詳細介紹：
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產品說明: |
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型號：PT03C
一、 產品特點
1、PBT外殼，耐高溫，耐腐蝕；
2、環氧樹脂灌封，隔離性能好，抗沖擊性強；
3、體積小，外形美觀，插針式直接焊接線路板；
4、線性范圍寬，一致性好。
二、 型號定義
三、性能指標
四、外形及引腳圖（單位：mm）
PT01/PT03實際(ji)上是一款毫安級精密電(dian)壓互感器（電(dian)流(liu)型電(dian)壓互感器），輸(shu)入額(e)定(ding)電(dian)流(liu)為2mA，額(e)定(ding)輸(shu)出電(dian)流(liu)為2mA。用(yong)戶使(shi)用(yong)時需(xu)要將電(dian)壓信號變換(huan)成(cheng)電(dian)流(liu)信號，推薦(jian)使(shi)用(yong)電(dian)路如圖1所示。圖1中(zhong)(zhong)，R'是(shi)(shi)限流(liu)(liu)電(dian)(dian)(dian)阻(zu)，不(bu)論額定輸入(ru)電(dian)(dian)(dian)壓(ya)(ya)多(duo)大(da)，調(diao)整(zheng)(zheng)R'的(de)值(zhi)，使(shi)(shi)額定輸入(ru)電(dian)(dian)(dian)流(liu)(liu)為(wei)2mA，就(jiu)滿(man)足使(shi)(shi)用(yong)(yong)條件。副邊(bian)電(dian)(dian)(dian)路是(shi)(shi)電(dian)(dian)(dian)流(liu)(liu)/電(dian)(dian)(dian)壓(ya)(ya)變換電(dian)(dian)(dian)路，當需要(yao)(yao)電(dian)(dian)(dian)壓(ya)(ya)輸出(chu)時采用(yong)(yong)。調(diao)整(zheng)(zheng)圖中(zhong)(zhong)反饋(kui)電(dian)(dian)(dian)阻(zu)R和r的(de)值(zhi)可(ke)得(de)到(dao)所需要(yao)(yao)的(de)電(dian)(dian)(dian)壓(ya)(ya)輸出(chu)。電(dian)(dian)(dian)容(rong)(rong)C1及可(ke)調(diao)電(dian)(dian)(dian)阻(zu)r'是(shi)(shi)用(yong)(yong)來補償相移的(de)。建議R取(qu)Vo/0.002,r取(qu)R/10，C1取(qu)值(zhi)約為(wei)65/R（μF）, r '取(qu)200kΩ 。電(dian)(dian)(dian)容(rong)(rong)C2和C3是(shi)(shi)400至(zhi)1000pF的(de)小電(dian)(dian)(dian)容(rong)(rong)，用(yong)(yong)來去耦(ou)和濾波(bo)。兩個反接的(de)二極管是(shi)(shi)起保護運(yun)算放大(da)器作用(yong)(yong)的(de)。運(yun)算放大(da)器視精(jing)(jing)度要(yao)(yao)求使(shi)(shi)用(yong)(yong)，推薦(jian)使(shi)(shi)用(yong)(yong)OP07系列，使(shi)(shi)用(yong)(yong)性(xing)能較(jiao)好的(de)運(yun)算放大(da)器較(jiao)容(rong)(rong)易達到(dao)較(jiao)高的(de)精(jing)(jing)度和較(jiao)好的(de)穩定性(xing)。運(yun)算放大(da)器電(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)壓(ya)(ya)通常取(qu)+15V或+12V，也可(ke)根據具體情(qing)況自定。圖1中電(dian)(dian)阻R和(he)R'要(yao)求精(jing)度(du)優于1%, 溫度(du)系數優于50PPM，R ' 的功率(lv)要(yao)求有(you)2 倍(bei)的余量(liang)。用戶使用推薦電(dian)(dian)路稍(shao)加改動也(ye)可構成單電(dian)(dian)源供電(dian)(dian)模式(shi)，適用于單極性A/D轉(zhuan)換器的輸入。額定(ding)輸入電(dian)(dian)流也(ye)可以選為1mA以降低功耗或(huo)5mA以減(jian)小相移(yi)，非線性度(du)仍優于0.1%。 五、使用方法
PT01/PT03次級如不加運算放大器而直接并聯一個電阻使輸出變換成電壓信號也是可以的。使用電路如圖2所示，前提是電阻要小于400Ω，輸出電壓***大1伏，這時仍能得到非線性度優于0.1%的輸出電壓信號。和推薦電路比較，其影響如下：1.縮小了互感器的動態范圍。2.使相移增大。
PT02實際上是一款電壓型精密電壓互感器，將電壓信號隔離變換成適當的電壓信號，額定輸入電壓通常有100V、450V等，額定輸出電壓通常4V、7.07V等，還可根據客戶要求另行設計，后面可不處理直接接A/D采樣電路 。 |
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