DSSR122

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描述

DSSR122

通常的觀念，認(rèn)為IGBT器件是電壓型控制器件——為柵偏壓控制，只需提供一定電平幅度的激勵(lì)電壓，而不需吸取激勵(lì)電流。在小功率電路中，僅由數(shù)字門電路，就可以驅(qū)動(dòng)MOS型絕緣柵場(chǎng)效應(yīng)管。做為IGBT，輸入電路恰好具有MOS型絕緣柵場(chǎng)效應(yīng)管的特性，因而也可視為電壓控制器件。這種觀念其實(shí)有失偏頗。因結(jié)構(gòu)和工藝的原因，IGBT管子的柵-射結(jié)間形成了一個(gè)名為Cge的結(jié)電容，對(duì)IGBT管子開通和截止的控制，其實(shí)就是Cge進(jìn)行的充、放電控制。+15V的激勵(lì)脈沖電壓，提供了Cge的一個(gè)充電電流通路，IGBT因之而開通；-7。5V的負(fù)向脈沖電壓，將Cge上的“已充電荷強(qiáng)行拉出來”，起到對(duì)充電電荷的快速中和作用，IGBT因之而截止。

假定IGBT管子只對(duì)一個(gè)工作頻率為零的直流電路進(jìn)行通斷控制，對(duì)Cge一次性充滿電后，幾乎不再需要進(jìn)行充、放電的控制，那么將此電路中的IGBT管子說成是電壓控制器件，是成立的。而問題是：變頻器輸出電路中的IGBT管子工作于數(shù)kHz的頻率之下，其柵偏壓也為數(shù)kHz頻率的脈沖電壓！一方面，對(duì)于這種較高頻率的信號(hào)，Cge的呈現(xiàn)出的容抗是較小的，故形成了較大的充、放電電流。另一方面，要使IGBT可靠和快速的開通（力爭(zhēng)使管子有較小的導(dǎo)通內(nèi)阻），在IGBT的允許工作區(qū)內(nèi)，就要提供盡可能大的驅(qū)動(dòng)電流（充電電流）。對(duì)于截止的控制也是一樣，須提供一個(gè)低內(nèi)阻（歐姆級(jí)）的外部泄放電路，將柵-射結(jié)電容上的電荷極快地泄放掉！
大家都知道電容為儲(chǔ)能元件，本身不消耗功率，稱為容性負(fù)載。但正猶如輸、配電線路的道理一樣，除了電源必須提供容性元件的無功電流（無功功率）外——這使得電源容量變大，無功電流也必然帶來了線路電阻上的損耗（線損）！驅(qū)動(dòng)電路的功率損耗主要集中在柵極電阻和末級(jí)放大管的導(dǎo)通內(nèi)阻上。我們常看到——尤其是大功率變頻器——驅(qū)動(dòng)電路的輸出級(jí)其實(shí)是一個(gè)功率放大電路，常由中功率甚至大功率對(duì)管、幾瓦的柵極電阻等元件構(gòu)成，說明IGBT的驅(qū)動(dòng)電路是消耗一定功率的，是需要輸出一定電流的。

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保?證?安全準(zhǔn)時(shí)發(fā)貨，
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優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。

主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家


選擇深圳長(zhǎng)欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營(yíng)：本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”（不管能不能看懂，先了解個(gè)大概，以便學(xué)習(xí)編程時(shí)查找）；
2、由位控邏輯入手，逐漸增加定時(shí)、計(jì)數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個(gè)物理回路驗(yàn)證，比如變頻器+電機(jī)+測(cè)速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時(shí)也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會(huì)一種至于其它的學(xué)習(xí)起來也就簡(jiǎn)單了。

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