过零检测应用实例.rar_功率控制_过零检测

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/622bc0b63d2fbb00079b7302/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622bc0b63d2fbb00079b7302/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">頁次<span class="_ _0"></span>（<span class="ff2 ls1">P<span class="_ _1"></span>AGE<span class="ff1 ls0">）</span></span></div><div class="t m0 x2 h2 y2 ff2 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x3 h2 y3 ff2 fs0 fc0 sc0 ls2 ws0">1/5 </div><div class="t m0 x4 h2 y4 ff2 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x5 h2 y5 ff2 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x5 h2 y6 ff2 fs0 fc0 sc0 ls3 ws0"> </div><div class="t m0 x6 h3 y7 ff1 fs1 fc0 sc1 ls4 ws0">实验八<span class="ff3 sc0 ls5"> </span>过零检测<span class="ff3 sc0 ls0"> </span></div><div class="t m0 x5 h4 y8 ff1 fs2 fc0 sc1 ls6 ws0">实验目标： </div><div class="t m0 x7 h4 y9 ff1 fs2 fc0 sc0 ls7 ws0">学习<span class="_ _2"> </span>8051 过零检测的方法 </div><div class="t m0 x5 h4 ya ff1 fs2 fc0 sc1 ls6 ws0">需求资源： </div><div class="t m0 x7 h4 yb ff1 fs2 fc0 sc0 ls8 ws0">中颖<span class="_ _2"> </span>SH79F32<span class="_ _2"> </span>学习板(LE<span class="ls9">D<span class="_ _2"> </span>灯)、AC12V<span class="_ _2"> </span>的电源 </span></div><div class="t m0 x5 h4 yc ff1 fs2 fc0 sc1 ls6 ws0">实验操作： </div><div class="t m0 x7 h4 yd ff1 fs2 fc0 sc0 ls0 ws0">步骤一：烧录程序 </div><div class="t m0 x8 h4 ye ff1 fs2 fc0 sc0 lsa ws0">1.<span class="ff4 ls0"> <span class="_ _3"> </span></span><span class="lsb">Option<span class="_ _2"> </span>设置：<span class="_ _4"></span>设置振荡器为外部<span class="_ _2"> </span>32.768KHz，<span class="_ _4"></span>外部电源<span class="_ _2"> </span>5V，<span class="_ _1"></span>开启看门狗和<span class="_ _2"> </span>LVR</span></div><div class="t m0 x9 h4 yf ff1 fs2 fc0 sc0 ls0 ws0">复位功能。</div><div class="t m0 xa h4 y10 ff1 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x8 h4 y11 ff1 fs2 fc0 sc0 lsa ws0">2.<span class="ff4 ls0"> <span class="_ _3"> </span><span class="ff1">连接上<span class="_ _2"> </span>12V<span class="_ _2"> </span>交流电源。 </span></span></div><div class="t m0 x8 h4 y12 ff1 fs2 fc0 sc0 lsa ws0">3.<span class="ff4 ls0"> <span class="_ _3"> </span></span><span class="lsc">将拨码跳线<span class="_ _2"> </span>J5<span class="_ _2"> </span>全部拨到<span class="_ _2"> </span>ON<span class="_ _2"> </span>状态。 </span></div><div class="t m0 x8 h4 y13 ff1 fs2 fc0 sc0 lsa ws0">4.<span class="ff4 ls0"> <span class="_ _3"> </span></span><span class="lsd">将<span class="_ _2"> </span>Code<span class="_ _2"> </span>烧录到学习板上，运行程序即可。 </span></div><div class="t m0 x8 h4 y14 ff1 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x7 h4 y15 ff1 fs2 fc0 sc0 ls0 ws0">步骤二：系统操作 </div><div class="t m0 xb h4 y16 ff1 fs2 fc0 sc0 lsa ws0">1.<span class="ff4 ls0"> <span class="_ _3"> </span><span class="ff1">当系统检测到过零点，<span class="_ _5"></span>系统中的一个<span class="_ _2"> </span>8<span class="_ _2"> </span>位计数器就会累加一，<span class="_ _5"></span>当超过<span class="_ _2"> </span>255<span class="_ _2"> </span>就自</span></span></div><div class="t m0 xc h4 y17 ff1 fs2 fc0 sc0 ls0 ws0">动清空，重新计数。 </div><div class="t m0 xb h4 y18 ff1 fs2 fc0 sc0 lsa ws0">2.<span class="ff4 ls0"> <span class="_ _3"> </span><span class="ff1">计数值通过<span class="_ _2"> </span>LED<span class="_ _2"> </span>灯显示出来。 </span></span></div><div class="t m0 x5 h4 y19 ff1 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x5 h4 y1a ff1 fs2 fc0 sc1 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div> </body> </html>