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高频å˜åŽ‹å™¨éƒ½å˜åœ¨ä»€ä¹ˆæ ·çš„é—®é¢?/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: 16px"> åœ¨ä½ çœ‹æ¥ï¼Œä½ 会认为高频å˜åŽ‹å™¨å˜åœ¨ç€ä¸€ä¸ªä»€ä¹ˆæ ·çš„é—®é¢?看看下é¢æˆ‘所说的是å¦æ£ç¡®å§ã€?/span></p>
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<p><span style="font-size: 16px">　　<strong>一ã€æ¼ç”µæ„Ÿ(简称æ¼æ„?</strong></span></p>
<p> </p>
<p><span style="font-size: 16px">　　ç†æƒ³çš„å˜åŽ‹å™¨(完全耦åˆçš„å˜åŽ‹å™¨)原边绕组产生的ç£é€šåº”全部穿过副边绕组，没有任何æŸå¤±å’Œæ³„æ¼ã€‚但实际上常规的å˜æ¢å˜åŽ‹å™¨ä¸å¯èƒ½å®žçŽ°æ²¡æœ‰ä»»ä½•æŸå¤±å’Œæ³„æ¼ã€‚原边绕组产生的ç£é€šä¸å¯èƒ½å…¨éƒ¨ç©¿è¿‡å‰¯è¾¹ç»•ç»„。éžè€¦åˆéƒ¨åˆ†ç£é€šå°±åœ¨ç»•ç»„或导体ä¸æœ‰å®ƒè‡ªå·±çš„电感，å˜è´®åœ¨è¿™ä¸ª“电感”ä¸çš„能é‡ä¸å’Œä¸»åŠŸçŽ‡å˜åŽ‹å™¨ç”µè·¯ç›¸è€¦åˆã€‚è¿™ç§ç”µæ„Ÿæˆ‘们称之为“æ¼æ„Ÿ”。ç†æƒ³å˜æ¢å™¨å¯¹ç»ç¼˜çš„è¦æ±‚和为了è¦å¾—到很低的电ç£å¹²æ‰?EMI)而需è¦å¾ˆç´§çš„电ç£è€¦åˆä»¥å‡å°æ¼æ„Ÿçš„è¦æ±‚，是相互矛盾的ã€?/span></p>
<p> </p>
<p><span style="font-size: 16px">　　当å˜åŽ‹å™¨ä¸é€šç”µ(转å‘脱离电æºæˆ–开关处于关æ–期é—?时，æ¼æ„Ÿå˜è´®çš„能é‡è¦é‡Šæ”¾å‡ºæ¥å½¢æˆæ˜Žæ˜¾çš„噪音。在示波器上能看到æ¤å™ªéŸ³çš„高频尖峰脉冲波形。高频尖峰脉冲波形的幅值Uspikeå’Œæ¼æ„ŸLleak与电æµç›¸å¯¹æ—¶é—´å˜åŒ–率的乘积æˆæ£æ¯”。å³ï¼?/span></p>
<p> </p>
<p><span style="font-size: 16px">　　当工作频率å‡é«˜ï¼Œç”µæµç›¸å¯¹æ—¶é—´çš„å˜åŒ–çŽ‡ä¹Ÿå°±å¢žåŠ ã€‚æ¼æ„Ÿçš„å½±å“将更严é‡ã€‚æ¼æ„Ÿçš„å½±å“å’Œå˜æ¢å™¨çš„开关速度æˆæ£æ¯”。æ¼æ„Ÿäº§ç”Ÿè¿‡é«˜çš„尖峰脉冲会æŸåå˜æ¢å™¨ä¸çš„功率器件并形æˆæ˜Žæ˜¾çš„电ç£å¹²æ‰°(EMI)。为了é™ä½Žæ¼æ„Ÿäº§ç”Ÿçš„尖峰脉冲幅值Uspike，而在å˜æ¢å™¨ç”µè·¯ä¸å¿…é¡»åŠ å…¥ç¼“å†²ç½‘ç»œã€‚ä½†ç¼“å†²ç½‘ç»œçš„åŠ å…¥ï¼Œä¼šå¢žå¤§å˜æ¢å™¨ç”µè·¯çš„æŸè€—。使å˜æ¢å™¨ç”µè·¯éšå·¥ä½œé¢‘率æ高，æŸè€—å¢žåŠ ï¼Œæ•ˆçŽ‡é™ä½Žã€?/span></p>
<p> </p>
<p><span style="font-size: 16px">　　<strong>(1)高压å˜åŽ‹å™¨ç»•ç»„间电容</strong></span></p>
<p> </p>
<p><span style="font-size: 16px">　　当å˜åŽ‹å™¨çš„绕组是多层绕组时，则顶层绕组和底层绕组之间就有电ä½å·®ã€‚两个导体之间有电ä½å·®ï¼Œå°±å˜åœ¨ç”µå®¹ã€‚这个电容就称为“绕组间电å®?rdquo;。当工作在高频时，这个电容会以惊人的速率进行充电和放电。电容充电和放电过程ä¸ä¼šäº§ç”ŸæŸè€—。在给定的时间内，它充电和放电的次数愈多，æŸè€—就愈大ã€?/span></p>
<p> </p>
<p><span style="font-size: 16px">　<strong>　(2)邻近效应</strong></span></p>
<p> </p>
<p><span style="font-size: 16px"><strong>　　(3)趋肤效应</strong></span></p>
<p> </p>
<p><span style="font-size: 16px">　<strong>　(4)局部过çƒç‚¹</strong></span></p>
<p> </p>
<p><span style="font-size: 16px">　　常规的å˜æ¢å˜åŽ‹å™¨å·¥ä½œåœ¨é«˜é¢‘时，其ç£èŠ¯ä¸éƒ¨ä¼šæœ‰å±€éƒ¨è¿‡çƒç‚¹ã€‚å› æ¤ï¼Œä¸ºäº†å‡å°çƒæ•ˆåº”，常规å˜æ¢å˜åŽ‹å™¨çš„工作频率æ高时，就必须相应地å‡å°å…¶ç£é€šå¯†åº¦ï¼Œå¢žå¤§å…¶ä½“ç§¯ã€‚è¿™å°±ä½¿å¾—æ— æ³•ç”¨å®ƒåŽ»åšé«˜åŠŸçŽ‡å¯†åº¦çš„电æºã€?/span></p>
<p> </p>
<p><span style="font-size: 16px">　　对于低输出电压ç†æƒ³åž‹å˜æ¢å™¨æ¥è¯´ï¼Œå®ƒçš„é™åŽ‹æ¯”是很高的。用常规å˜æ¢å˜åŽ‹å™¨æ—¶ï¼Œé€šå¸¸1åŒè¾“出绕组，大约需è¦?2åŒåŽŸè¾¹ç»•ç»„ã€‚è¿™æ ·ï¼ŒåŽŸè¾¹ç»•ç»„å°±éœ€å¤šå±‚å¸ƒç½®ï¼Œå› è€Œæ¼æ„Ÿå’Œç»•ç»„间电容大ã€è¶‹è‚¤æ•ˆåº”和邻近效应严é‡ç‰ä¸åˆ©å› ç´ åœ¨å˜æ¢å˜åŽ‹å™¨ä¸éƒ½å˜åœ¨ã€?/span></p>
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