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<p>åœ¨ä¼ ç»Ÿçš„<a href="http://www.chenfeipower.com"><strong>高频å˜åŽ‹å™¨è®¾è®?/strong></a>ä¸ï¼Œç”±äºŽç£èŠ¯æ料的é™åˆ¶ï¼Œå…¶å·¥ä½œé¢‘率较低，一般在<span lang="EN-US">20kHz</span>å·¦å³ã€‚éšç€ç”µæºæŠ€æœ¯çš„ä¸æ–å‘展，电æºç³»ç»Ÿçš„å°åž‹åŒ–ã€é«˜é¢‘化和大功率化已æˆä¸ºä¸€ä¸ªæ°¸æ’çš„ç ”ç©¶æ–¹å‘å’Œå‘å±•è¶‹åŠ¿ã€‚å› æ¤ï¼Œç ”究使用频率更高的电æºå˜åŽ‹å™¨æ˜¯é™ä½Žç”µæºç³»ç»Ÿä½“积ã€æ高电æºè¾“å‡ºåŠŸçŽ‡æ¯”çš„å…³é”®å› ç´ ã€?/p>
<p style="text-indent:24.0pt;mso-char-indent-count:2.0">本例ä¸çš„å˜æ¢å™¨é‡‡ç”¨å•ç«¯åæ¿€å¼å·¥ä½œæ–¹å¼ï¼Œå•ç«¯åæ¿€å˜æ¢å™¨åœ¨å°åŠŸçŽ‡å¼€å…³ç”µæºè®¾è®¡ä¸åº”用éžå¸¸å¹¿æ³›ï¼Œä¸”多路输出较方便。å•ç«¯å激电æºçš„工作模å¼æœ‰ä¸¤ç§ï¼šç”µæµè¿žç»æ¨¡å¼å’Œç”µæµæ–ç»æ¨¡å¼ã€‚å‰è€…适用于较å°åŠŸçŽ‡ï¼Œå‰¯è¾¹äºŒæžç®¡å˜åœ¨æ²¡æœ‰åå‘æ¢å¤çš„问题，但<span lang="EN-US">MOS</span>管的峰值电æµç›¸å¯¹è¾ƒå¤§ï¼›åŽè€?span lang="EN-US">MOS</span>管的峰值电æµç›¸å¯¹è¾ƒå°ï¼Œä½†å˜åœ¨å‰¯è¾¹äºŒæžç®¡çš„åå‘æ¢å¤é—®é¢˜ï¼Œéœ€è¦ç»™äºŒæžç®¡åŠ å¸æ”¶ç”µè·¯ã€‚这两ç§å·¥ä½œæ¨¡å¼å¯æ ¹æ®å®žé™…需求æ¥é€‰æ‹©ï¼Œæœ¬æ–‡é‡‡ç”¨äº†åŽè€?/p>
<p style="margin-left:24.0pt">　　设计å˜åŽ‹å™¨æ—¶å¤§å¤šéœ€è¦è€ƒè™‘下é¢é—®é¢˜ï¼šå˜æ¢å™¨é¢‘率<span lang="EN-US">f(H2)</span>ï¼›åˆçº§ç”µåŽ?span lang="EN-US">U1(V)</span>，次级电åŽ?span lang="EN-US">U2(V)</span>；次级电æµ?span lang="EN-US">i2(A)</span>；绕组线路å‚æ•?span lang="EN-US">n1</span>ã€ï¼Œ<span lang="EN-US">n2</span>；温å?tau;<span lang="EN-US">(</span>â„?span lang="EN-US">)</span>；绕组相对电压é™<span lang="EN-US">u</span>；环境温åº?tau;<span lang="EN-US">HJ(</span>â„?span lang="EN-US">)</span>ï¼›ç»ç¼˜æ料密åº?gamma;<span lang="EN-US">z(g</span>ï¼?span lang="EN-US">cm3)</span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">1)</span>æ ¹æ®å˜åŽ‹å™¨çš„输出功率选å–é“芯，所选å–çš„é“芯的户，值应ç‰äºŽæˆ–大于给定值ã€?/p>
<p style="margin-left:24.0pt;text-indent:24.0pt"><span lang="EN-US">2)</span>绕组æ¯ä¼åŒæ•°</p>
<p style="margin-left:24.0pt">　　高频å˜åŽ‹å™¨å‚数计ç®?/p>
<p style="margin-left:24.0pt">　　一ï¼?电ç£å¦è®¡ç®—å…¬å¼æŽ¨å¯¼ï¼š</p>
<p><span lang="EN-US">1</span>．ç£é€šé‡ä¸Žç£é€šå¯†åº¦ç›¸å…³å…¬å¼ï¼šã€€ã€€</p>
<p style="margin-left:24.05pt;mso-para-margin-left:2.29gd;text-indent:24.0pt;
mso-char-indent-count:2.0">Ф<span lang="EN-US"> = B * S<span style="mso-spacerun:yes"> </span></span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">B = H * </span>μ<span lang="EN-US"><span style="mso-spacerun:yes"> </span></span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">H = I*N / l </span></p>
<p style="margin-left:24.0pt"><span lang="EN-US"> </span></p>
<p><span lang="EN-US">2</span>．电感ä¸å感应电动势与电æµä»¥åŠç£é€šä¹‹é—´ç›¸å…³å…³ç³»å¼ï¼?/p>
<p style="margin-left:24.0pt"><span lang="EN-US"> </span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">EL =</span>⊿Ð?span lang="EN-US"> / </span>âŠ?span lang="EN-US">t * N<span style="mso-spacerun:yes"> </span></span></p>
<p style="margin-left:24.0pt"><span lang="EN-US"> </span></p>
<p style="margin-left:24.0pt"><span lang="EN-US"><span style="mso-spacerun:yes"> </span></span>⑷　　<span lang="EN-US">EL = </span>�span lang="EN-US">i / </span>�span lang="EN-US">t * L<span style="mso-spacerun:yes"> </span></span></p>
<p style="margin-left:24.0pt">　　由上é¢ä¸¤ä¸ªå…¬å¼å¯ä»¥æŽ¨å‡ºä¸‹é¢çš„å…¬å¼ï¼?/p>
<p style="margin-left:24.0pt">　　⊿Ð?span lang="EN-US"> / </span>âŠ?span lang="EN-US">t * N = </span>âŠ?span lang="EN-US">i / </span>âŠ?span lang="EN-US">t * L<span style="mso-spacerun:yes"> </span></span>å˜å½¢å¯å¾—ï¼?/p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">N = </span>âŠ?span lang="EN-US">i * L/</span>⊿Ф　　å†ç”±Ð¤<span lang="EN-US"> = B * S<span style="mso-spacerun:yes"> </span></span>å¯å¾—下å¼<span lang="EN-US">:</span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">N = </span>âŠ?span lang="EN-US">i * L / ( B * S )<span style="mso-spacerun:yes"> </span></span>　　且由⑸å¼ç›´æŽ¥å˜å½¢å¯å¾—ï¼?/p>
<p>　�span lang="EN-US">i = EL<span style="mso-spacerun:yes"> </span>* </span>�span lang="EN-US">t / L<span style="mso-spacerun:yes"> </span></span></p>
<p>　è”åˆâ‘´â‘µâ‘¶â‘·åŒæ—¶å¯ä»¥æŽ¨å‡ºå¦‚下算å¼<span lang="EN-US">:</span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">L =(</span>μ<span lang="EN-US">* S )/ l * N2<span style="mso-spacerun:yes"> </span></span></p>
<p>　这说明在ç£èŠ¯ä¸€å®šçš„情况下电感é‡ä¸ŽåŒæ•°çš„平方æˆæ£æ¯?span lang="EN-US">(</span>å½±å“电感é‡çš„å› ç´ <span lang="EN-US">)</span></p>
<p style="margin-left:24.0pt"><span lang="EN-US"> </span></p>
<p><span lang="EN-US">3</span>．电感ä¸èƒ½é‡ä¸Žç”µæµçš„关系ï¼?/p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">QL = 1/2 * I2 * L<span style="mso-spacerun:yes"> </span></span></p>
<p><span lang="EN-US">4</span>ï¼Žæ ¹æ®èƒ½é‡å®ˆæ’定律åŠå½±å“电感é‡çš„å› ç´ å’Œè”åˆâ‘ºâ‘»â‘¼å¼å¯ä»¥å¾—出åˆæ¬¡çº§åŒæ•°æ¯”与å 空比的关系å¼ï¼š</p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">N1/N2 = (E1*D)/(E2*(1-D))<span style="mso-spacerun:yes"> </span></span></p>
<p>二． æ ¹æ®ä¸Šé¢å…¬å¼è®¡ç®—å˜åŽ‹å™¨å‚数：</p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">1</span>ï¼?高频å˜åŽ‹å™¨è¾“入输出è¦æ±‚：</p>
<p style="margin-left:24.0pt">　　输入直æµç”µåŽ‹ï¼?span lang="EN-US"> 200--- 340 V</span></p>
<p style="margin-left:24.0pt">　　输出直æµç”µåŽ‹ï¼?span lang="EN-US"> 23.5V</span></p>
<p style="margin-left:24.0pt">　　输出电æµï¼?span lang="EN-US"> 2.5A * 2</span></p>
<p style="margin-left:24.0pt">　　输出总功率：<span lang="EN-US"> 117.5W</span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">2</span>ï¼?确定åˆæ¬¡çº§åŒæ•°æ¯”ï¼?/p>
<p style="margin-left:24.0pt">　　次级整æµç®¡é€‰ç”¨<span lang="EN-US">VRRM =100V</span>æ£å‘电æµ<span lang="EN-US">(10A)</span>的肖特基二æžç®¡ä¸¤ä¸ªï¼Œè‹¥åˆæ¬¡çº§åŒæ•°æ¯”大则功率所承å—çš„å压高åŒæ•°æ¯”å°åˆ™åŠŸçŽ‡ç®¡å低<span lang="EN-US">,</span>è¿™æ ·å°±æœ‰ä¸‹å¼ï¼?/p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">N1/N2 = VIN(max) / (VRRM * k<span style="mso-spacerun:yes"> </span>/ 2)</span></p>
<p style="margin-left:24.0pt">　　这里安全系数å?span lang="EN-US">0.9</span></p>
<p style="margin-left:24.0pt">　由æ¤å¯å¾—åŒæ•°æ¯?span lang="EN-US">N1/N2<span style="mso-spacerun:yes"> </span>=<span style="mso-spacerun:yes"> </span>340/(100*0.9/2) </span>â‰?span lang="EN-US"> 7.6</span></p>
<p style="margin-left:24.0pt"><span lang="EN-US">3</span>ï¼?计算功率场效应管的最高å峰电åŽ?span lang="EN-US">:</span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">Vmax = Vin(max) + (Vo+Vd)/ N2/ N1 </span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">Vmax = 340+(23.5+0.89)/(1/7.6)</span></p>
<p style="margin-left:24.0pt">　　由æ¤å¯è®¡ç®—功率管承å—的最大电åŽ?span lang="EN-US">: Vmax </span>â‰?span lang="EN-US"> 525.36(V)</span></p>
<p><span lang="EN-US">4</span>ï¼?计算<span lang="EN-US">PWM</span>å 空比：</p>
<p style="margin-left:24.0pt">　　由⑽å¼å˜å½¢å¯å¾—：</p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">D = (N1/N2)*E2/(E1+(N1 /N2*E2)</span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">D=(N1/N2)*(Vo+Vd)/Vin(min)+N1/N2*(Vo+Vd) </span></p>
<p style="margin-left:24.0pt"><span lang="EN-US"><span style="mso-spacerun:yes"> </span></span>⒀　　<span lang="EN-US">D=7.6*(23.5+0.89)/200+7.6*(23.5+0.89)</span></p>
<p style="margin-left:24.0pt">　　由些å¯è®¡ç®—得到å 空比<span lang="EN-US"> D</span>â‰?span lang="EN-US"> 0.481</span></p>
<p><span lang="EN-US">5</span>ï¼?ç®—å˜åŽ‹å™¨åˆçº§ç”µæ„Ÿé‡ï¼š</p>
<p style="margin-left:24.0pt">　　为计算方便å‡å®šå˜åŽ‹å™¨åˆçº§ç”µæµä¸ºé”¯é½¿æ³¢ï¼Œä¹Ÿå°±æ˜¯ç”µæµå˜åŒ–é‡ç‰äºŽç”µæµçš„å³°å€?span lang="EN-US">,</span>也就是ç†æƒ³çš„认为输出管在导通期间储å˜çš„能é‡åœ¨æˆªæ¢æœŸé—´å…¨éƒ¨æ¶ˆè€—完。那么计算åˆçº§ç”µæ„Ÿé‡å°±å¯ä»¥åªä»?span lang="EN-US">PWM</span>的一个周期æ¥åˆ†æžï¼Œè¿™æ—¶å¯ç”±â‘¼å¼å¯ä»¥æœ‰å¦‚下推导过程ï¼?/p>
<p style="margin-left:24.0pt">　　ï¼?span lang="EN-US">P/</span>ηï¼?span lang="EN-US">/ f<span style="mso-spacerun:yes"> </span>= 1/2 * I2 * L</span></p>
<p style="margin-left:24.0pt">　　将æ¤ç®—å¼ä»£å…¥â’‚å¼å˜å½¢å¯å¾—ï¼?/p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">L = E2 * D2 *</span>η<span lang="EN-US">/ ( 2 * f * P ) </span></p>
<p style="margin-left:24.0pt"><span lang="EN-US"><span style="mso-spacerun:yes"> </span></span>⒃　　这里å–效率为<span lang="EN-US">85%</span>ï¼?span lang="EN-US"> PWM</span>开关频率为<span lang="EN-US">60KHz.</span></p>
<p style="margin-left:24.0pt">　　在输入电压最å°çš„电感é‡ä¸ºï¼?/p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">L=2002* 0.4812 * 0.85 / 2 * 60000 * 117.5</span></p>
<p style="margin-left:24.0pt">　　计算åˆçº§ç”µæ„Ÿé‡ä¸º<span lang="EN-US">: L1 </span>â‰?span lang="EN-US"> 558(uH)</span></p>
<p style="margin-left:24.0pt">　　计算åˆçº§å³°å€¼ç”µæµï¼š</p>
<p style="margin-left:24.0pt">　　由⑺å¼å¯å¾—：</p>
<p style="margin-left:24.0pt">　　�span lang="EN-US">i = EL<span style="mso-spacerun:yes"> </span>* </span>�span lang="EN-US">t / L = 200 * (0.481/60000 )/ (558*10-6)</span></p>
<p style="margin-left:24.0pt">　　计算åˆçº§ç”µæµçš„峰值为<span lang="EN-US">: Ipp </span>â‰?span lang="EN-US"> 2.87(A)</span></p>
<p style="margin-left:24.0pt">　　åˆçº§å¹³å‡ç”µæµä¸ºï¼š<span lang="EN-US"> I1 = Ipp/2/(1/D) = 0.690235(A)</span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">6</span>ï¼?计算åˆçº§çº¿åœˆå’Œæ¬¡çº§çº¿åœˆçš„åŒæ•°ï¼?/p>
<p style="margin-left:24.0pt">　　ç£èŠ¯é€‰æ‹©ä¸?span lang="EN-US">EE-42(</span>截é¢ç§?span lang="EN-US">1.76mm2)</span>ç£é€šå¯†åº¦ä¸ºé˜²æ²»é¥±å’Œå–值为<span lang="EN-US">2500</span>高斯也å³<span lang="EN-US">0.25</span>特斯æ‹?span lang="EN-US">, </span>è¿™æ ·ç”±â‘¹å¼å¯å¾—åˆçº§ç”µæ„Ÿçš„åŒæ•°ä¸?span lang="EN-US">:</span></p>
<p style="margin-left:24.0pt">　　<span lang="EN-US">N1= </span>�span lang="EN-US">i * L / ( B * S ) = 2.87 * (0.558*10-3)/0.25*(1.76*10-4)</span></p>
<p style="margin-left:24.0pt">　　计算åˆçº§ç”µæ„ŸåŒæ•°<span lang="EN-US">:<span style="mso-spacerun:yes"> </span>N1 </span>â‰?span lang="EN-US"> 36 (</span>åŒ?span lang="EN-US">)</span></p>
<p style="margin-left:24.0pt">　　åŒæ—¶å¯è®¡ç®—次级åŒæ•°ï¼š<span lang="EN-US"> N2 </span>â‰?span lang="EN-US"> 5 (</span>åŒ?span lang="EN-US">)</span></p>
<p style="margin-left:24.0pt"><span lang="EN-US">7</span>ï¼?计算次级线圈的峰值电æµï¼š</p>
<p style="margin-left:24.0pt">ã€€ã€€æ ¹æ®èƒ½é‡å®ˆæ’定律当åˆçº§ç”µæ„Ÿåœ¨åŠŸçŽ‡ç®¡å¯¼é€šæ—¶å‚¨å˜çš„能é‡åœ¨æˆªæ¢æ—¶åœ¨æ¬¡çº§çº¿åœˆä¸Šå…¨éƒ¨é‡Šæ”¾å¯ä»¥æœ‰ä¸‹å¼ï¼?/p>
<p style="margin-left:24.0pt">　　由⑻⑼å¼å¯ä»¥å¾—到：　　<span lang="EN-US">Ipp2=N1/N2* Ipp </span></p>
<p style="margin-left:24.0pt"><span lang="EN-US"><span style="mso-spacerun:yes"> </span></span>⒄　　<span lang="EN-US">Ipp2 = 7.6*2.87</span></p>
<p style="margin-left:24.0pt">　　由æ¤å¯è®¡ç®—次级峰值电æµä¸ºï¼?span lang="EN-US">Ipp2 = 21.812(A)</span></p>
<p style="margin-left:24.0pt">　　次级平å‡å€¼ç”µæµä¸º<span lang="EN-US">I2=Ipp2/2/(1/(1-D))= 5.7(A)</span></p>
<p><span lang="EN-US">6.</span>计算激励绕ç»?span lang="EN-US">(</span>也å«è¾…助绕组<span lang="EN-US">)</span>çš„åŒæ•°ï¼š</p>
<p style="margin-left:24.0pt">ã€€ã€€å› ä¸ºæ¬¡çº§è¾“å‡ºç”µåŽ‹ä¸?span lang="EN-US">23.5V</span>，激励绕组电压å–<span lang="EN-US">12V</span>，所以为次级电压的一å?/p>
<p style="margin-left:24.0pt">　　由æ¤å¯è®¡ç®—激励绕组åŒæ•°ä¸º<span lang="EN-US">: N3 </span>â‰?span lang="EN-US"> N2 / 2 </span>â‰?span lang="EN-US"> 3 (</span>åŒ?span lang="EN-US">)</span></p>
<p style="margin-left:24.0pt">　　激励绕组的电æµå?span lang="EN-US">:<span style="mso-spacerun:yes"> </span>I3 = 0.1(A)</span></p>
<p style="margin-left:24.0pt;text-indent:24.0pt">以上就是å°ç¼–为大家总结的关于高频å˜åŽ‹å™¨çš„技术å‚数怎么计算的介ç»ï¼Œå¸Œæœ›å¯ä»¥å¸®åˆ°å¤§å®¶ï¼Œå¦‚果想了解更多的高频å˜åŽ‹å™¨çš„ä¿¡æ¯ï¼Œé‚£å°±ç‚¹å‡»<a href="http://www.chenfeipower.com/news/"><span style="color:red">高频å˜åŽ‹å™¨èµ„è®?/span></a>å?span lang="EN-US">!</span></p>
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