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class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/dongying/637218867238125000/5461838.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="c73ievs" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/dongying/637218867238125000/5461838.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="cmzqsur" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>江蘇省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>四川通用電子線圈</p><p><span>***更新：</span>2020-06-28 14:26:20</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="pyarjln" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">無錫東英電子有限公司</a></p><p><span>聯(lián)系人：</span>朱淇華</p><p><span>郵箱: </span>wxdydz@163.com</p><p><span>電話: </span>13921179070</p><p><span>傳真: </span>0510_</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>0510-83785478</p><p><span>地址: </span>江蘇省無錫市錫山區(qū)錫北鎮(zhèn)新壩村</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="3blifcy" class="page-proshow02"><p class="title">詳細說明</p><div id="zt32bzo" class="box"><p><p> 諧振電容: c 單位:PF 本題建義c=500...1000pf 可自行先決定，或由Q值決定 </p> <p> 諧振電感: l 單位: 微亨 </p> <p> 線圈電感的計算公式 </p> <p> 1。針對環(huán)形線圈,有以下公式可利用: (鐵芯) </p> <p> L=N2.AL L= 電感值(H) </p> <p> H-DC=0.4πNI / l N= 線圈匝數(shù)(圈) </p> <p> AL= 感應(yīng)系數(shù) </p> <p> H-DC=直流磁化力 I= 通過電流(A) </p> <p> l= 磁路長度(cm) </p> <p> l及AL值大小，可參照Microl對照表。例如: 以T50-52材，線圈5圈半，其L值為T50-52(表示OD為0.5英吋)，經(jīng)查表其AL值約為33nH </p> <p> L=33.(5.5)2=998，四川通用電子線圈.25nH≒1μH </p> <p> 當流過10A電流時，其L值變化可由l=3.74(查表) </p> <p> H-DC=0.4πNI / l = 0.4×3.14×5.5×10 / 3.74 = 18，四川通用電子線圈，四川通用電子線圈.47 (查表后) </p> <p> 即可了解L值下降程度(μi%) </p> <p> 2。介紹一個經(jīng)驗公式 </p> <p> L=(k*μ0*μs*N2*S)/l </p> <p> 其中 </p> <p> μ0 為真空磁導率=4π*10(-7)。(10的負七次方) </p> <p> μs 為線圈內(nèi)部磁芯的相對磁導率，空心線圈時μs=1 </p> <p> N2 為線圈圈數(shù)的平方 </p> <p> S 線圈的截面積，單位為平方米 </p> <p> l 線圈的長度，單位為米 </p> <p> k 系數(shù)，取決于線圈的半徑(R)與長度(l)的比值。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="四川通用電子線圈" src="https://tyunfile.71360.com/WaterMark/UploadFile/dongying/637218867238125000/5461838.png"></div><p> 二極管d和第三電阻r3的公共端b作為診斷輸入端連接cpld控制器向cpld控制器輸入診斷狀態(tài)位，cpld控制器的反饋輸出端還連接至mcu并輸出反饋狀態(tài)位，在本申請中，cpld控制器的反饋輸出端包括斷路反饋輸出端c2以及短路反饋輸出端c3，斷路反饋輸出端c2用于輸出斷路反饋狀態(tài)位，短路反饋輸出端c3用于輸出短路反饋狀態(tài)位。mcu的狀態(tài)清零端c4還連接cpld控制器，所述狀態(tài)清零端c4用于輸出清零信號。在圖1所示電路中，電阻r1接+24v電壓組成上拉結(jié)構(gòu)。二極管d的負極接+，由于二極管d和第三電阻r3的公共端b端要接入cpld控制器，因此這個結(jié)構(gòu)可以起到限壓的作用。由于b端接入cpld控制器，因此cpld控制器可以檢測到b端在不同情況下的邏輯狀態(tài)，同時cpld控制器也將進行資源配置，以便準確的依據(jù)b端的邏輯狀態(tài)對驅(qū)動輸出端c1和反饋輸出端進行實時的鎖定及調(diào)整。在本申請中：驅(qū)動使能信號是mcu發(fā)出的驅(qū)動車用電磁閥t1工作的總開關(guān)信號；斷路反饋狀態(tài)位是cpld控制器輸出的指示車用電磁閥t1斷路的信號，該信號在被mcu讀取之前一直被鎖定，直到被清零信號清理。短路反饋狀態(tài)位是cpld控制器輸出的指示車用電磁閥t1短路的信號，該信號在被mcu讀取之前一直被鎖定，直到被清零信號清理。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="四川通用電子線圈" src="https://tyunfile.71360.com/WaterMark/UploadFile/dongying/637218867224033203/4399878.png"></div><p> 電動車無刷電機控制器短路的工作模型解決方案：溫升公式：Tj=Tc+P×Rth(jc)根據(jù)單脈沖的熱阻系數(shù)確定允許的短路時間工作溫度越高短路保護時間就應(yīng)該越短1短路模型及分析短路模型如圖1所示，其中*畫出了功率輸出級的A、B兩相(共三相)。Q1和Q3為A相MOSFET，Q2和Q4為B相MOSFET，所有功率MOSFET均為AOT430。L1為電機線圈，Rs為電流檢測電阻。當控制器工作時，如電機短路，則會形成如圖1中所示的流經(jīng)Q2，Q3的短路電流，其電流值很大，達幾百安培，MOSFET的瞬態(tài)溫升很大，這種情況下應(yīng)及時保護，否則會使MOSFET結(jié)點溫度過高而使MOSFET損壞。短路時Q3電壓和電流波形如圖2所示。圖2a中的MOSFET能承受45us的大電流短路，而圖2b中的MOSFET不能承受45us的大電流短路，當脈沖45us關(guān)斷后，Vds回升，由于溫度過高，*經(jīng)過10us的時間MOSFET便短路，Vds迅速下降,短路電流迅速上升。由圖2我們可以看出短路時峰值電流達500A，這是由于短路時MOSFET直接將電源正負極短路，回路阻抗是導線，PCB走線及MOSFET的Rds(on)之和，其數(shù)值很小，一般為幾十毫歐至幾百毫歐。2計算合理的保護時間在實際應(yīng)用中，不同設(shè)計的控制器，其回路電感和電阻存在一定的差別以及短路時的電源電壓不同。</p></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/424264.html</p></div></div></div></div></div><div id="pjgiuro" class="page-right twoColRt"><div id="laxpbnk" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="oyvceq7" class="recomPic likePro"><a href="http://m.cdcfah.com/cp/814588.html"><div><img 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