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开关电æºçº¹æ³¢äº§ç”Ÿçš„åŽŸå› åˆ†æž</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><a href="http://www.chenfeipower.com"><strong>开关电æº?/strong></a>设计时ç»å¸¸ä¼šå‡ºçŽ°å™ªå£°ï¼Œä¹Ÿå°±æ˜¯è¾“出波纹，那么开关电æºäº§ç”Ÿæ³¢çº¹çš„åŽŸå› æ˜¯ä»€ä¹ˆå‘¢ï¼Ÿç”±äºŽæ³¢çº¹çš„å˜åœ¨ä¼šå¯¹å¼€å…³ç”µæºçš„æ£å¸¸å·¥ä½œäº§ç”Ÿå½±å“ï¼Œå› æ¤æˆ‘们必须抑制波纹的产生，但是我们åªæœ‰å¯¹äº§ç”Ÿæ³¢çº¹çš„åŽŸå› è¿›è¡Œäº†è§£åˆ†æžäº†ï¼Œæˆ‘们æ‰å¯èƒ½æ‰¾åˆ°è§£å†³çš„办法，本文就是为大家先介ç»å¼€å…³ç”µæºæ³¢çº¹äº§ç”Ÿçš„åŽŸå› è¿›è¡Œäº†åˆ†æžã€‚具体的情况请看下é¢å…·ä½“的分æžã€?/p>
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<p style="text-align: center;"><img src="http://www.chenfeipower.com/UploadFiles/Product/20120703160354_67923.jpg" alt="开关电æºå˜åŽ‹å™¨" title="ER40高频å˜åŽ‹å™¨ç«‹å¼? /></p>
<p style="text-align: center;"> </p>
<p>éšç€SWITCH的开关，电感Lä¸çš„电æµä¹Ÿæ˜¯åœ¨è¾“出电æµçš„有效值上下波动的。所以在输出端也会出现一个与SWITCHåŒé¢‘率的纹波，一般所说的纹波就是指这个。它与输出电容的容é‡å’ŒESR有关系。这个纹波的频率与开关电æºç›¸åŒï¼Œä¸ºå‡ ååˆ°å‡ ç™¾KHzã€?/p>
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<p>å¦å¤–，SWITCHåŒæžæ™¶ä½“管或MOSFET的一般选择，ä¸ç®¡æ˜¯å“ªä¸€ç§ï¼Œåœ¨å…¶å¸¦é¢†çš„截æ¢æ—¶é—´ï¼Œä¼šæœ‰ä¸€ä¸ªä¸Šå‡æ—¶é—´å’Œä¸‹é™æ—¶é—´ã€‚æ¤æ—¶åœ¨ç”µè·¯ä¸ä¼šå‡ºçŽ°ä¸Žå¼€å…³ä¸Šå‡æ—¶é—´ç›¸åŒæˆ–频率为奇 æ•°çš„é¢‘çŽ‡çš„å™ªéŸ³ï¼Œé€šå¸¸ä¸ºå‡ å兆赫。在åå‘æ¢å¤çš„瞬间，ç‰æ•ˆç”µè·¯çš„电阻电容和电感串è”ï¼Œå°†å¯¼è‡´å…±æŒ¯ï¼Œå™ªå£°é¢‘çŽ‡ä¹Ÿä¸ºå‡ å兆赫。这2ç§å™ªå£°é€šå¸¸è¢«ç§°ä¸ºé«˜é¢‘噪声， 而振幅通常远大于纹波ã€?/p>
<p> </p>
<p>如果是ACï¼DCå˜æ¢å™¨ï¼Œé™¤äº†ä¸Šè¿°ä¸¤ç§çº¹æ³¢(噪声)以外，还有AC噪声，频率是输入AC电æºçš„频率，ä¸?0ï½?0Hzå·¦å³ã€‚还有一ç§å…±æ¨¡å™ªå£°ï¼Œæ˜¯ç”±äºŽå¾ˆå¤šå¼€å…³ç”µæºçš„功率器件使用外壳作为散çƒå™¨ï¼Œäº§ç”Ÿçš„ç‰æ•ˆç”µå®¹å¯¼è‡´çš„ã€?/p>
<p> </p>
<p>开关电æºçš„波纹有什么è¦æ±‚呢？主è¦æ˜¯çœ‹äº§å“的设计以åŠå¯¹è´Ÿè½½çš„需æ±? 现在åšä¸€ä¸ªå¥½ç‚¹çš„电æºï¼Œè¾“出纹波电压控制在以下200mV，å°äº?0mV 如果一个å°ä¿¡å·æ¨¡æ‹Ÿå’Œæ•°å—控制电路，特别是模拟电路，电æºçº¹æ³¢è¦æ±‚éžå¸¸å¹²å‡€ï¼Œå¯¹å…¶ä»–应用程åºï¼Œå¦‚å‘光二æžç®¡é©±åŠ¨ç”µæºï¼Œçº¹æ³¢æ˜¯ä¸€ç‚¹ç‚¹ä¹Ÿæ²¡æœ‰å¤ªå¤§çš„å½±å“</p>
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mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">以上就是å°ç¼–为大家总结的关于开关电æºæ³¢çº¹äº§ç”Ÿçš„åŽŸå› çš„åˆ†æžï¼Œä»¥ä¾›å¤§å®¶å‚考ã€?span style="color:gray">如果还有什么问题或者了解更多关于高频å˜åŽ‹å™¨çš„知识，需è¦å¦ä¹ 资料的朋å‹ï¼Œæœ¬ç½‘ç«™æ¯å‘¨ä¼šæ›´æ–°ä¸€ï¼Œä¸¤ç¯‡ç›¸å…³çš„æ–‡ç« åœ¨è¿™ä¸ªä¸“é¢˜ï¼Œä¸ºäº†æ–¹ä¾¿å¤§å®¶æŸ¥çœ‹ï¼Œå¯</span></span>收è—æœ¬ç½‘ç«™ã€‚å¦‚æžœä½ è¿˜æƒ³äº†è§£æœ¬ç«™æ›´å¤šçš„ç›¸å…³æ–‡ç« ï¼Œå¯ä»¥ç‚¹å‡»<a href="http://www.chenfeipower.com/news/"><strong>高频å˜åŽ‹å™¨çŸ¥è¯?/strong></a>解ç”ã€?/p>
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