- 商品名稱：PT01C 電壓互感器
- 添加時間：2020-05-11 14:39:57
介紹：
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產品說明: |
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型號：PT01C
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實際上是一款(kuan)毫安級(ji)jing.mi電(dian)壓互(hu)感器（電(dian)流(liu)(liu)型電(dian)壓互(hu)感器），輸(shu)入(ru)額定電(dian)流(liu)(liu)為(wei)(wei)2mA，額定輸(shu)出(chu)電(dian)流(liu)(liu)為(wei)(wei)2mA。用戶使用時需(xu)要將電(dian)壓信號變(bian)換成電(dian)流(liu)(liu)信號，推薦(jian)使用電(dian)路如(ru)圖1所(suo)示。圖1中，R'是(shi)(shi)(shi)限流電(dian)(dian)(dian)(dian)阻(zu)，不論額定(ding)(ding)輸入電(dian)(dian)(dian)(dian)壓多大，調(diao)整R'的(de)(de)值(zhi)，使(shi)(shi)額定(ding)(ding)輸入電(dian)(dian)(dian)(dian)流為2mA，就(jiu)滿(man)足使(shi)(shi)用(yong)(yong)(yong)(yong)條件。副邊(bian)電(dian)(dian)(dian)(dian)路(lu)是(shi)(shi)(shi)電(dian)(dian)(dian)(dian)流/電(dian)(dian)(dian)(dian)壓變換(huan)電(dian)(dian)(dian)(dian)路(lu)，當(dang)需要電(dian)(dian)(dian)(dian)壓輸出時采用(yong)(yong)(yong)(yong)。調(diao)整圖(tu)中反饋電(dian)(dian)(dian)(dian)阻(zu)R和r的(de)(de)值(zhi)可得到所需要的(de)(de)電(dian)(dian)(dian)(dian)壓輸出。電(dian)(dian)(dian)(dian)容C1及可調(diao)電(dian)(dian)(dian)(dian)阻(zu)r'是(shi)(shi)(shi)用(yong)(yong)(yong)(yong)來補償(chang)相移(yi)的(de)(de)。建(jian)議R取(qu)Vo/0.002,r取(qu)R/10，C1取(qu)值(zhi)約(yue)為65/R（μF）, r '取(qu)200kΩ 。電(dian)(dian)(dian)(dian)容C2和C3是(shi)(shi)(shi)400至1000pF的(de)(de)小電(dian)(dian)(dian)(dian)容，用(yong)(yong)(yong)(yong)來去耦和濾(lv)波。兩個反接的(de)(de)二極管是(shi)(shi)(shi)起(qi)保護運算(suan)放大器(qi)作用(yong)(yong)(yong)(yong)的(de)(de)。運算(suan)放大器(qi)視精(jing)度(du)要求(qiu)使(shi)(shi)用(yong)(yong)(yong)(yong)，推薦使(shi)(shi)用(yong)(yong)(yong)(yong)OP07系列，使(shi)(shi)用(yong)(yong)(yong)(yong)性(xing)能較(jiao)(jiao)(jiao)好的(de)(de)運算(suan)放大器(qi)較(jiao)(jiao)(jiao)容易達到較(jiao)(jiao)(jiao)高的(de)(de)精(jing)度(du)和較(jiao)(jiao)(jiao)好的(de)(de)穩定(ding)(ding)性(xing)。運算(suan)放大器(qi)電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓通常(chang)取(qu)+15V或(huo)+12V，也可根(gen)據具體情況(kuang)自定(ding)(ding)。圖1中(zhong)電(dian)阻R和R'要求精度優(you)(you)于1%, 溫度系(xi)數(shu)優(you)(you)于50PPM，R ' 的功率要求有2 倍的余量。用(yong)戶使用(yong)推(tui)薦電(dian)路稍加改動也可構成單(dan)電(dian)源供(gong)電(dian)模(mo)式，適用(yong)于單(dan)極性A/D轉換器的輸入。額定(ding)輸入電(dian)流也可以選為1mA以降低(di)功耗或5mA以減小(xiao)相(xiang)移(yi)，非(fei)線性度仍優(you)(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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