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text-indent: 21pt;">系統設計方案</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">1.</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">系統設計思路</span><span lang="EN-US"> </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">本系統有兩種工作方式，其一是數控電流源，其二是數控掃描電流源</span><span lang="EN-US">. </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">在第一種工作方式時，由鍵盤預設電流值、關閉掃描電流源，根據預設電流值由數字電位器實現</span><span lang="EN-US"> D/A </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">轉換，并利用運放工作在電流負反饋的特點及三極管擴流獲得直流電流源</span><span lang="EN-US">. </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">在第二種工作方式時，由鍵盤預設掃描起點的電流值、掃描電流范圍，根據預設掃描起點的電流值由數字電位器實現</span><span lang="EN-US"> D/A </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">轉換作為掃描電流的起始值，同時與由并行</span><span lang="EN-US"> D/A </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">轉換器以一定速率實現的掃描電流值相疊加，然后利用運放工作在電流負反饋的特點及三極管擴流獲得一定初始值的掃描直流電流源</span><span lang="EN-US">. </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">2 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">系統設計框圖</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14053163507349.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14053163663393.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14053163837157.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"> </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">3 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">系統硬件圖</span><span lang="EN-US"> </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">3.1 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">硬件簡介</span><span lang="EN-US"> </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">AT89C51</span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">是</span><span lang="EN-US">8</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">位單片機</span><span lang="EN-US">. </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">有四組</span><span lang="EN-US">8</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">位準雙向</span><span lang="EN-US">I/O</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">、</span><span lang="EN-US">5</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">個中斷資源、</span><span lang="EN-US">1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">個串行接口、片內</span><span lang="EN-US">256B</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的</span><span lang="EN-US">RAM</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">及</span><span lang="EN-US">4KB</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">的程序存貯器、片外可外擴</span><span lang="EN-US">64KB RAM</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">及程序存貯器</span><span lang="EN-US">. </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">在智能化控制有著廣泛的應用</span><span lang="EN-US">. </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">DAC0832 </span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">是</span><span lang="EN-US"> 8 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">位雙緩沖電流型</span><span lang="EN-US"> D/A </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">轉換器</span><span lang="EN-US">. </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">工作電壓</span><span lang="EN-US"> VCC</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">：</span><span lang="EN-US">+5V~+15V</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，基準參考電壓</span><span lang="EN-US"> VREF</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">：</span><span lang="EN-US">+10V~-10V</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，</span><span lang="EN-US">ILE</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">：允許輸入鎖存，高電平有效；</span><span lang="EN-US">/CS</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">：低電平有效；</span><span lang="EN-US">/WR1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">（寫信號</span><span lang="EN-US">1</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">）低電平有效，用來將總線送來的數據鎖存于輸入鎖存器中</span><span lang="EN-US">. /WR2</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">（寫信號</span><span lang="EN-US"> 2</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">）低電平有效，用于將輸入鎖存器中的數據傳送到</span><span lang="EN-US"> DAC </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">鎖存器中并鎖存起來</span><span lang="EN-US">. /XFER</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">（傳送控制信號）</span> <span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">：低電平有效，用來控制</span><span lang="EN-US">/WR2</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">，選通</span><span lang="EN-US"> D/A</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">轉換</span><span lang="EN-US">. Iout1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">（</span><span lang="EN-US">DAC </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">電流輸出端</span><span lang="EN-US"> 1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">，電流穩定時間為</span><span lang="EN-US"> 1 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">微秒）</span> <span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">，當數字量全</span><span lang="EN-US"> 1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">，輸出</span><span lang="EN-US"> Iout1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">最大</span><span lang="EN-US">. Iout2</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">（</span><span lang="EN-US">DAC </span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">電流輸出端</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14053164011939.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">TLC0834</span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">是</span><span lang="EN-US">4</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">通道</span><span lang="EN-US">8</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">位串行</span><span lang="EN-US">A/D</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">轉換器，模擬量輸入可工作于差分方式或單端輸入方式</span><span lang="EN-US">. DI</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">：用于設置通道輸入方式及通道選擇，</span><span lang="EN-US">DO</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">：</span><span lang="EN-US">A/D</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">轉換后串行數據輸出；</span><span lang="EN-US">CLK</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">：時鐘信號輸入端；</span><span lang="EN-US">/CS</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">：片選信號，低電平有效；基準參考電壓</span><span lang="EN-US"> VREF. </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">T1 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">管最好采用達林頓管，</span><span lang="EN-US"> T2 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">管應采用大功率管</span><span lang="EN-US">. </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">若負載為感性負載時應有</span><span lang="EN-US">D1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">管，</span> <span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">否則可省略</span><span lang="EN-US">. R</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">為取樣電阻，一般為小阻值大功率電阻</span><span lang="EN-US">. </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">鍵盤用于電流掃描起點、掃描范圍、電流預設值及工作狀態的設置</span><span lang="EN-US">. </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14053164179938.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">4 </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">軟件流程圖</span><span lang="EN-US"> </span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span 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list-border-w"> <div id="tpnrxl7j" class="list-date"> <span>31</span> <p>2018-10</p> </div> <h4><a title="實驗用4軸數控加工中心的開發" href="/bethel/news/show_2254.html" target="_blank">實驗用4軸數控加工中心的開發</a></h4> <p>隨著 數控 技術的出現，不同形式的數控加工設備相繼使用在各個生產行業，例如，數控 車床、加工中心以及數控 加工中心等，而且目前 數控 技術已經向智能化方向發展［1-2］。在這樣的形勢下，數控 機床的設計與組裝已經成為本科機電專業學生的重要實踐課程。通過設計與組裝，學生不僅可以掌握… <a href="/bethel/news/show_2254.html" target="_blank">[了解更多]</a></p> </div> <div id="tpnrxl7j" class="news-list list-border list-border-w"> <div id="tpnrxl7j" class="list-date"> <span>30</span> <p>2018-10</p> </div> <h4><a title="淺談數控加工中心加工特殊零件的夾具" href="/bethel/news/show_2253.html" target="_blank">淺談數控加工中心加工特殊零件的夾具</a></h4> <p>隨著制造業的不斷發展，數控加工中心在制造領域中發揮著重要 的作用。夾具在數控加工中心加工過程中，一方面是對待加工零件進 行夾緊，防止其在加工過程中移位；另一方面是對零件起到定位 作用。尤其是在加工特殊零件時，合適的夾具可以更好的保證加 工精度，使加工過程更為流暢、高效，也能夠有效… <a href="/bethel/news/show_2253.html" target="_blank">[了解更多]</a></p> </div> <div id="tpnrxl7j" class="news-list list-border list-border-w"> <div id="tpnrxl7j" class="list-date"> 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