- 商品名稱：PT02v 電壓互感器
- 添加時間：2020-05-11 14:07:24
介紹：
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產品說明: |
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型號：PT02v
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實際上(shang)是一款毫安級jing.mi電壓互(hu)感器（電流(liu)型電壓互(hu)感器），輸入額定(ding)電流(liu)為2mA，額定(ding)輸出(chu)電流(liu)為2mA。用戶使(shi)用時需(xu)要將電壓信號變換成(cheng)電流(liu)信號，推薦使(shi)用電路如圖1所示(shi)。圖1中，R'是(shi)限流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻，不論額(e)定(ding)(ding)輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓多大，調整R'的(de)值，使額(e)定(ding)(ding)輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)為2mA，就(jiu)滿足使用(yong)(yong)條件。副邊電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)是(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)/電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓變換電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，當需要(yao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓輸(shu)出時采用(yong)(yong)。調整圖中反饋電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻R和(he)(he)r的(de)值可(ke)得到所需要(yao)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓輸(shu)出。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容C1及可(ke)調電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻r'是(shi)用(yong)(yong)來補償相移(yi)的(de)。建(jian)議R取(qu)Vo/0.002,r取(qu)R/10，C1取(qu)值約為65/R（μF）, r '取(qu)200kΩ 。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容C2和(he)(he)C3是(shi)400至1000pF的(de)小電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容，用(yong)(yong)來去(qu)耦和(he)(he)濾波。兩個反接的(de)二極管是(shi)起保護運算放(fang)大器作用(yong)(yong)的(de)。運算放(fang)大器視精度要(yao)求使用(yong)(yong)，推(tui)薦使用(yong)(yong)OP07系列(lie)，使用(yong)(yong)性(xing)能較(jiao)好的(de)運算放(fang)大器較(jiao)容易達到較(jiao)高的(de)精度和(he)(he)較(jiao)好的(de)穩(wen)定(ding)(ding)性(xing)。運算放(fang)大器電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓通常取(qu)+15V或+12V，也可(ke)根據具體(ti)情況自(zi)定(ding)(ding)。圖1中電(dian)(dian)阻R和R'要求精度(du)優(you)于1%, 溫度(du)系(xi)數優(you)于50PPM，R ' 的功率要求有(you)2 倍的余量。用(yong)戶使用(yong)推薦(jian)電(dian)(dian)路稍加改(gai)動(dong)也(ye)可構成(cheng)單(dan)電(dian)(dian)源供電(dian)(dian)模式(shi)，適用(yong)于單(dan)極性A/D轉換(huan)器的輸入(ru)。額定輸入(ru)電(dian)(dian)流也(ye)可以選為(wei)1mA以降低功耗或5mA以減(jian)小(xiao)相移，非線性度(du)仍優(you)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jing.mi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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