TOKYO FAo111A

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TOKYO FAo111A

目前，PCB已然成為“電子產(chǎn)品之母”，其應(yīng)用幾乎滲透于電子產(chǎn)業(yè)的各個(gè)終端領(lǐng)域中，包括計(jì)算機(jī)、通信、消費(fèi)電子、工業(yè)控制、醫(yī)療儀器、國(guó)防軍工、航天航空等諸多領(lǐng)域。那么PCB是如何設(shè)計(jì)出來(lái)的呢？

1、前期準(zhǔn)備

包括準(zhǔn)備元件庫(kù)和原理圖。在進(jìn)行PCB設(shè)計(jì)之前，首先要準(zhǔn)備好原理圖SCH元件庫(kù)和PCB元件封裝庫(kù)。

PCB元件封裝庫(kù)最好是工程師根據(jù)所選器件的標(biāo)準(zhǔn)尺寸資料建立。原則上先建立PC的元件封裝庫(kù)，再建立原理圖SCH元件庫(kù)。

PCB元件封裝庫(kù)要求較高，它直接影響PCB的安裝；原理圖SCH元件庫(kù)要求相對(duì)寬松，但要注意定義好管腳屬性和與PCB元件封裝庫(kù)的對(duì)應(yīng)關(guān)系。

2、PCB結(jié)構(gòu)設(shè)計(jì)

根據(jù)已經(jīng)確定的電路板尺寸和各項(xiàng)機(jī)械定位，在PCB設(shè)計(jì)環(huán)境下繪制PCB板框，并按定位要求放置所需的接插件、按鍵/開關(guān)、螺絲孔、裝配孔等等。

充分考慮和確定布線區(qū)域和非布線區(qū)域（如螺絲孔周圍多大范圍屬于非布線區(qū)域）。

3、PCB布局設(shè)計(jì)

布局設(shè)計(jì)即是在PCB板框內(nèi)按照設(shè)計(jì)要求擺放器件。在原理圖工具中生成網(wǎng)絡(luò)表（Design→Create Netlist），之后在PCB軟件中導(dǎo)入網(wǎng)絡(luò)表（Design→import Netlist）。網(wǎng)絡(luò)表導(dǎo)入成功后會(huì)存在于軟件后臺(tái)，通過(guò)Placement操作可以將所有器件調(diào)出、各管腳之間有飛線提示連接，這時(shí)就可以對(duì)器件進(jìn)行布局設(shè)計(jì)了。

PCB布局設(shè)計(jì)是PCB整個(gè)設(shè)計(jì)流程中的首個(gè)重要工序，越復(fù)雜的PCB板，布局的好壞越能直接影響到后期布線的實(shí)現(xiàn)難易程度。

布局設(shè)計(jì)依靠電路板設(shè)計(jì)師的電路基礎(chǔ)功底與設(shè)計(jì)經(jīng)驗(yàn)豐富程度，對(duì)電路板設(shè)計(jì)師屬于較高級(jí)別的要求。初級(jí)電路板設(shè)計(jì)師經(jīng)驗(yàn)尚淺、適合小模塊布局設(shè)計(jì)或整板難度較低的PCB布局設(shè)計(jì)任務(wù)。

4、PCB布線設(shè)計(jì)

PCB布線設(shè)計(jì)是整個(gè)PCB設(shè)計(jì)中工作量最大的工序，直接影響著PCB板的性能好壞。

在PCB的設(shè)計(jì)過(guò)程中，布線一般有三種境界：

首先是布通，這是PCB設(shè)計(jì)的最基本的入門要求；

其次是電氣性能的滿足，這是衡量一塊PCB板是否合格的標(biāo)準(zhǔn)，在線路布通之后，認(rèn)真調(diào)整布線、使其能達(dá)到最佳的電氣性能；

再次是整齊美觀，雜亂無(wú)章的布線、即使電氣性能過(guò)關(guān)也會(huì)給后期改板優(yōu)化及測(cè)試與維修帶來(lái)極大不便，布線要求整齊劃一，不能縱橫交錯(cuò)毫無(wú)章法。

5、布線優(yōu)化及絲印擺放

“PCB設(shè)計(jì)沒(méi)有最好、只有更好”，“PCB設(shè)計(jì)是一門缺陷的藝術(shù)”，這主要是因?yàn)镻CB設(shè)計(jì)要實(shí)現(xiàn)硬件各方面的設(shè)計(jì)需求，而個(gè)別需求之間可能是沖突的、魚與熊掌不可兼得。

例如：某個(gè)PCB設(shè)計(jì)項(xiàng)目經(jīng)過(guò)電路板設(shè)計(jì)師評(píng)估需要設(shè)計(jì)成6層板，但是產(chǎn)品硬件出于成本考慮、要求必須設(shè)計(jì)為4層板，那么只能犧牲掉信號(hào)屏蔽地層、從而導(dǎo)致相鄰布線層之間的信號(hào)串?dāng)_增加、信號(hào)質(zhì)量會(huì)降低。

一般設(shè)計(jì)的經(jīng)驗(yàn)是：優(yōu)化布線的時(shí)間是初次布線的時(shí)間的兩倍。PCB布線優(yōu)化完成后，需要進(jìn)行后處理，首要處理的是PCB板面的絲印標(biāo)識(shí)，設(shè)計(jì)時(shí)底層的絲印字符需要做鏡像處理，以免與頂層絲印混淆。

6、網(wǎng)絡(luò)DRC檢查及結(jié)構(gòu)檢查

質(zhì)量控制是PCB設(shè)計(jì)流程的重要組成部分，一般的質(zhì)量控制手段包括：設(shè)計(jì)自檢、設(shè)計(jì)互檢、專家評(píng)審會(huì)議、專項(xiàng)檢查等。

原理圖和結(jié)構(gòu)要素圖是最基本的設(shè)計(jì)要求，網(wǎng)絡(luò)DRC檢查和結(jié)構(gòu)檢查就是分別確認(rèn)PCB設(shè)計(jì)滿足原理圖網(wǎng)表和結(jié)構(gòu)要素圖兩項(xiàng)輸入條件。

一般電路板設(shè)計(jì)師都會(huì)有自己積累的設(shè)計(jì)質(zhì)量檢查Checklist，其中的條目部分來(lái)源于公司或部門的規(guī)范、另一部分來(lái)源于自身的經(jīng)驗(yàn)總結(jié)。專項(xiàng)檢查包括設(shè)計(jì)的Valor檢查及DFM檢查，這兩部分內(nèi)容關(guān)注的是PCB設(shè)計(jì)輸出后端加工光繪文件。

7、PCB制板

在PCB正式加工制板之前，電路板設(shè)計(jì)師需要與PCB甲供板廠的PE進(jìn)行溝通，答復(fù)廠家關(guān)于PCB板加工的確認(rèn)問(wèn)題。

這其中包括但不限于：PCB板材型號(hào)的選擇、線路層線寬線距的調(diào)整、阻抗控制的調(diào)整、PCB層疊厚度的調(diào)整、表面處理加工工藝、孔徑公差控制與交付標(biāo)準(zhǔn)等。

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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(wú)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(lè)，ACSO，力士樂(lè)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(lái)也就簡(jiǎn)單了。

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