1756-PBR2 產(chǎn)品說明：
1756-PBR2
【技術(shù)參數(shù)】(執(zhí)行標(biāo)準(zhǔn)：Q//YYK006-2a333)
【精度等級(jí)】：測(cè)量精度：0.6、0.3級(jí);顯示位數(shù)：整四位LED(888)顯示、整五位LED(8888)、液晶LCD顯示
【輸入】：電壓：AC300V、AC120V、AC4500、DC65mV等/電流：AC3A、2A、DC30mA等
【過量程】：持續(xù)：2.5倍，瞬時(shí)：電流15倍/5秒，電壓3倍/10秒
【頻率】：70±10%
【隔離耐壓】：電源與輸入變送輸出、通訊接口為AC3KV輸入、變送輸出、通訊接口兩間為AC1KV
【絕緣電阻】：≧500MΩ
【平均無故障工作時(shí)間】：≧80000h
【數(shù) 量】：海量庫存、幾乎所有型號(hào);
【貨 期】：現(xiàn)貨當(dāng)天打款當(dāng)日發(fā)、訂貨3-6周;
【應(yīng)用領(lǐng)域】：廣泛應(yīng)用于數(shù)控機(jī)械 冶金、石油天然氣、石油化工、化工、造紙印刷、紡織印染、機(jī)械、電子制造、
汽車制造、煙草、塑膠機(jī)械、電力、水利、水處理/環(huán)保、市政工程、鍋爐供暖、能源、輸配電。plc安裝與布線
與單一閉環(huán)的電壓控制模式相比，電流模式控制是雙閉環(huán)控制系統(tǒng)，外環(huán)由輸出電壓反饋電路形成，內(nèi)環(huán)由互感器采樣輸出電感電流形成。在該雙環(huán)控制中，由電壓外環(huán)控制電流內(nèi)環(huán)，即內(nèi)環(huán)電流在每一開關(guān)周期內(nèi)上升，直至達(dá)到電壓外環(huán)設(shè)定的誤差電壓閡值。電流內(nèi)環(huán)是瞬時(shí)快速進(jìn)行逐個(gè)脈沖比較工作的，并且監(jiān)測(cè)輸出電感電流的動(dòng)態(tài)變化，電壓外環(huán)只負(fù)責(zé)控制輸出電壓。因此電流型控制模式具有比起電壓型控制模式大得多的帶寬。
[align=center]圖2 電流型控制原理框圖 Fig2 The principle of current-control [/align] 電流型控制模式有不少優(yōu)點(diǎn)：線性調(diào)整率（電壓調(diào)整率）非常好；整個(gè)反饋電路變成了一階電路，由于反饋信號(hào)電路與電壓型相比，減少了一階，因此誤差放大器的控制環(huán)補(bǔ)償網(wǎng)絡(luò)得以簡(jiǎn)化，穩(wěn)定度得以提高并且改善了頻響，具有更大的增益帶寬乘積；具有瞬時(shí)峰值電流限流功能；簡(jiǎn)化了反饋控制補(bǔ)償網(wǎng)絡(luò)、負(fù)載限流、磁通平衡等電路的設(shè)計(jì)，減少了元器件的數(shù)量和成本，這對(duì)提高開關(guān)電源的功率密度，實(shí)現(xiàn)小型化，模塊化具有重要的意義。當(dāng)然了也有缺點(diǎn)，例如占空比大于50％時(shí)系統(tǒng)可能出現(xiàn)不穩(wěn)定性，可能會(huì)產(chǎn)生次諧波振蕩；另外，在電路拓?fù)浣Y(jié)構(gòu)選擇上也有局限，在升壓型和降壓—升壓型電路中，由于儲(chǔ)能電感不在輸出端，存在峰值電流與平均電流的誤差。對(duì)噪聲敏感，抗噪聲性差等等。對(duì)于這樣的缺點(diǎn)現(xiàn)在已經(jīng)有了解決的方案，斜波補(bǔ)償是很必要的一種方法。
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