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需è¦çŸ¥é“的高频å˜åŽ‹å™¨çš„设计基础知识</h3>
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<span>æ–‡ç« å‡ºå¤„ï¼?a href=""><a href="http://cfdz.nsw888.com">深圳市晨飞电å有é™å…¬å?/a></a></span><span>网责任编辑：<a href="http://cfdz.nsw888.com">NSW</a></span><span>作者：<a href="http://cfdz.nsw888.com">NSW</a></span><span>人气ï¼?span
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<p>　　<span style="font-size: 14px">高频链逆å˜æŠ€æœ¯ç”¨é«˜é¢‘å˜åŽ‹å™¨ä»£æ›¿ä¿å®ˆé€†å˜å™¨ä¸ç¬¨é‡çš„工频å˜åŽ‹å™¨ï¼Œå¤§å¤§å‡å°äº†é€†å˜å™¨çš„体积和é‡é‡ã€‚高频链的硬件电路设计ä¸ï¼Œé«˜é¢‘å˜åŽ‹å™¨æ˜¯é‡è¦çš„一环ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　设计</span><strong><a href="http://www.chenfeipower.com/Products/products-12081703391.html"><span style="font-size: 14px">高频å˜åŽ‹å™?/span></a></strong><span style="font-size: 14px">首先应该从ç£èŠ¯å¼€å§‹ï¼Œå¼€å…³ç”µæºå˜åŽ‹å™¨ç£èŠ¯å¤šæ˜¯ä½Žç£åœºä¸‹ä½¿ç”¨çš„软ç£æ料，有较高ç£å¯¼çŽ‡ï¼Œä½Žçš„矫顽力，高的电阻率。ç£å¯¼çŽ‡é«˜ï¼Œä¸€å®šçº¿åœˆåŒæ•°æ—¶ï¼Œé€šè¿‡ä¸å¤§çš„æ¿€ç£ç”µæµå°±èƒ½æ‰¿å—è¾ƒé«˜çš„å¤–åŠ ç”µåŽ‹ï¼Œå› æ¤ï¼Œè¾“出一定功率è¦æ±‚下，å¯å‡è½»ç£èŠ¯ä½“积。ç£èŠ¯çŸ«é¡½åŠ›ä½Žï¼Œç£æ»žé¢ç§¯å°ï¼Œåˆ™é“耗也少。高的电阻率，则涡æµå°ï¼Œé“耗å°ã€‚é“氧体æ料是å¤åˆæ°§åŒ–物烧结体，电阻率很高，适åˆé«˜é¢‘下使用，但Bs值比较å°ï¼Œå¸¸ä½¿ç”¨åœ¨å¼€å…³ç”µæºä¸ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　高频å˜åŽ‹å™¨çš„设计通常采用两ç§æ–¹æ³•ï¼šç¬¬ä¸€ç§æ˜¯å…ˆæ±‚出ç£èŠ¯çª—å£é¢ç§¯AW与ç£èŠ¯æœ‰æ•ˆæˆªé¢ç§¯Ae乘积APAP=A WAe称ç£èŠ¯é¢ç§¯ä¹˜ç§?ï¼Œæ ¹æ®AP值，查表找出所需ç£æ€§èµ„料之编å·;第二ç§æ˜¯å…ˆæ±‚å‡ºå‡ ä½•å‚数，查表找出ç£èŠ¯ç¼–å·ï¼Œå†è¿›è¡Œè®¾è®¡ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　注æ„ï¼?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　1ã€è®¾è®¡ä¸ï¼Œæœ€å¤§è¾“出功率时，ç£èŠ¯ä¸çš„ç£æ„Ÿåº”强度ä¸åº”达到饱和，以å…在大信å·æ—¶äº§ç”Ÿå¤±çœŸã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　2ã€çž¬å˜è¿‡ç¨‹ä¸ï¼Œé«˜é¢‘链æ¼æ„Ÿå’Œåˆ†å¸ƒç”µå®¹ä¼šå¼•èµ·æµªæ¶Œç”µæµå’Œå°–峰电压åŠè„‰å†²é¡¶éƒ¨æŒ¯è¡ï¼Œä½¿æŸè€—å¢žåŠ ï¼Œä¸¥é‡æ—¶ä¼šé€ æˆå¼€å…³ç®¡æŸå。åŒæ—¶ï¼Œè¾“出绕组åŒæ•°å¤šï¼Œå±‚数多时，应考虑分布电容的影å“，é™ä½Žåˆ†å¸ƒç”µå®¹æœ‰åˆ©äºŽæŠ‘制高频信å·å¯¹è´Ÿè½½çš„干扰。对åŒä¸€å˜åŽ‹å™¨åŒæ—¶å‡å°‘分布电容和æ¼æ„Ÿæ˜¯å›°éš¾çš„åº”æ ¹æ®ä¸åŒçš„工作è¦æ±‚，ä¿è¯åˆé€‚的电容和电感ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　å•ç‰‡å¼€å…³ç”µæºé«˜é¢‘å˜åŽ‹å™¨çš„设计è¦ç‚?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　高频å˜åŽ‹å™¨æ˜¯å•ç‰‡å¼€å…³ç”µæºçš„æ ¸å¿ƒéƒ¨ä»¶ï¼Œé‰´äºŽè¿™ç§é«˜é¢‘å˜åŽ‹å™¨åœ¨è®¾è®¡ä¸Šæœ‰å…¶ç‰¹æ®Šæ€§ï¼Œä¸ºæ¤ä¸“门论述é™ä½Žå…¶æŸè€—åŠæŠ‘制音频噪声的方法，å¯ä¾›é«˜é¢‘å˜åŽ‹å™¨è®¾è®¡äººå‘˜å‚考ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　å•ç‰‡å¼€å…³ç”µæºé›†æˆç”µè·¯å…·æœ‰é«˜é›†æˆåº¦ã€é«˜æ€§ä»·æ¯”ã€æœ€ç®€å¤–围电路ã€æœ€ä½³æ€§èƒ½æŒ‡æ ‡ç‰ä¼˜ç‚¹ï¼Œèƒ½æž„æˆé«˜æ•ˆçŽ‡æ— 工频å˜åŽ‹å™¨çš„隔离å¼å¼€å…³ç”µæºã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　高频å˜åŽ‹å™¨æ˜¯å¼€å…³ç”µæºä¸è¿›è¡Œèƒ½é‡è´®å˜ä¸Žä¼ 输的é‡è¦éƒ¨ä»¶ï¼Œå•ç‰‡å¼€å…³ç”µæºä¸é«˜é¢‘å˜åŽ‹å™¨æ€§èƒ½çš„优劣，ä¸åªå¯¹ç”µæºæ•ˆçŽ‡æœ‰è¾ƒå¤§çš„å½±å“，而且直接关系到电æºçš„å…¶å®ƒæŠ€æœ¯æŒ‡æ ‡å’Œç”µç£å…¼å®¹æ€?EMC为æ¤ï¼Œä¸€ä¸ªé«˜æ•ˆçŽ‡é«˜é¢‘å˜åŽ‹å™¨åº”具备直æµæŸè€—和交æµæŸè€—低ã€æ¼æ„Ÿå°ã€ç»•ç»„自身的分布电容åŠå„绕组之间的耦åˆç”µå®¹è¦å°ç‰æ¡ä»¶ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　高频å˜åŽ‹å™¨çš„ç›´æµæŸè€—是由线圈的铜æŸè€—é€ æˆçš„，为æ高效率，应尽é‡é€‰æ‹©è¾ƒç²—的导线，并å–电æµå¯†åº¦J=410A /mm2</span></p>
<p> </p>
<p><span style="font-size: 14px">　　高频å˜åŽ‹å™¨çš„交æµæŸè€—是由高频电æµçš„趋肤效应以åŠç£èŠ¯çš„æŸè€—引起的，高频电æµé€šè¿‡å¯¼çº¿æ—¶æ€»æ˜¯è¶‹å‘于从表é¢æµè¿‡ï¼Œè¿™ä¼šä½¿å¯¼çº¿çš„有效æµé€šé¢ç§¯å‡å°ï¼Œå¹¶ä½¿å¯¼çº¿çš„交æµç‰æ•ˆé˜»æŠ—远高于铜电阻。高频电æµå¯¹å¯¼ä½“çš„ç©¿é€èƒ½åŠ›ä¸Žå¼€å…³é¢‘çŽ‡çš„å¹³æ–¹æ ¹æˆå比，为å‡å°äº¤æµé“œé˜»æŠ—，导线åŠå¾„ä¸å¾—超越高频电æµå¯è¾¾æ·±åº¦çš?å€ã€‚å¯ä¾›é€‰ç”¨çš„导线线径与开关频率的关系曲线如图1所示。举例说明，当f=100kHz时，导线直径ç†è®ºä¸Šå¯å?phi;0.4mm但为了å‡å°è¶‹è‚¤æ•ˆåº”，实际å¯ç”¨æ›´ç»†çš„导线多股并绕，而ä¸å¿…ä¸€æ ¹ç²—å¯¼çº¿ç»•åˆ¶ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　设计高频å˜åŽ‹å™¨æ—¶å¿…需把æ¼æ„Ÿå‡è‡³æœ€å°ï¼Œå› 为æ¼æ„Ÿæ„ˆå¤§ï¼Œå‘生的尖峰电压幅度愈高，æ¼æžé’³ä½ç”µè·¯çš„æŸè€—就愈大，这必定导致电æºæ•ˆçŽ‡é™ä½Žã€‚对于一个符åˆç»ç¼˜åŠå¹³å®‰æ€§æ ‡å‡†çš„高频å˜åŽ‹å™¨ï¼Œå…¶æ¼æ„Ÿé‡åº”为次级开路时åˆçº§ç”µæ„Ÿé‡çš„1%3%è¦æƒ³è¾¾åˆ°1%ä»¥ä¸‹çš„æŒ‡æ ‡ï¼Œåˆ¶é€ å·¥è‰ºä¸Šå°†éš¾äºŽå®žçŽ°ã€‚å‡å°æ¼æ„Ÿæ—¶å¯é‡‡å–以下措施：</span></p>
<p> </p>
<p><span style="font-size: 14px">　　å‡å°åˆçº§ç»•ç»„çš„åŒæ•°NPï¼?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　增大绕组的宽åº?例如选EEåž‹ç£èŠ¯ï¼Œä»¥å¢žåŠ 骨架宽度b)</span></p>
<p> </p>
<p><span style="font-size: 14px">ã€€ã€€å¢žåŠ ç»•ç»„çš„é«˜ã€å®½æ¯”ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">　　å‡å°å„绕组之间的ç»ç¼˜å±‚ã€?/span></p>
<p> </p>
<p><span style="font-size: 14px">ã€€ã€€å¢žåŠ ç»•ç»„ä¹‹é—´çš„è€¦åˆç¨‹åº¦ã€?/span></p>
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