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开关电æºåŽ‚家浅æžè´´ç‰‡ç£ç 的原ç†åŠåº”ç”?/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 ">贴片ç£ç </a>的主è¦åŽŸæ–™ä¸ºé“氧体，é“氧体是一ç§ç«‹æ–¹æ™¶æ ¼ç»“构的亚é“ç£æ€§æ料，é“氧体æ料为é“é•åˆé‡‘或é“é•åˆé‡‘ï¼Œå®ƒçš„åˆ¶é€ å·¥è‰ºå’Œæœºæ¢°æ€§èƒ½ä¸Žé™¶ç“·ç›¸ä¼¼ï¼Œé¢œè‰²ä¸ºç°é»‘色。电ç£å¹²æ‰°æ»¤æ³¢å™¨ä¸ç»å¸¸ä½¿ç”¨çš„一类ç£èŠ¯å°±æ˜¯é“氧体æ料，许多厂商都æ供专门用于电ç£å¹²æ‰°æŠ‘制的é“氧体æ料。这ç§æ料的特点是高频æŸè€—éžå¸¸å¤§ï¼Œå…·æœ‰å¾ˆé«˜çš„导ç£çŽ‡ï¼Œå®ƒå¯ä»¥ä½¿ç”µæ„Ÿçš„线圈绕组之间在高频高阻的情况下产生的电容最å°ã€?/p>
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<p>　　é“氧体ææ–™é€šå¸¸åº”ç”¨äºŽé«˜é¢‘æƒ…å†µï¼Œå› ä¸ºåœ¨ä½Žé¢‘æ—¶å®ƒä»¬ä¸»è¦å‘ˆçŽ°ç”µæ„Ÿç‰¹æ€§ï¼Œä½¿å¾—æŸè€—很å°ã€‚在高频情况下，它们主è¦å‘ˆçŽ°ç”µæŠ—特性并且éšé¢‘率改å˜ã€‚实际应用ä¸ï¼Œé“氧体æ料是作为射频电路的é«?频衰å‡å™¨ä½¿ç”¨çš„。实际上，é“氧体å¯ä»¥è¾ƒå¥½çš„ç‰æ•ˆäºŽç”µé˜»ä»¥åŠç”µæ„Ÿçš„并è”，低频下电阻被电感çŸè·¯ï¼Œé«˜é¢‘下电感阻抗å˜å¾—相当高，以至于电æµå…¨éƒ¨é€šè¿‡ç”µé˜»ã€‚é“氧体是一个消耗装置，高频能é‡åœ¨ä¸Šé¢è½¬åŒ–为çƒèƒ½ï¼Œè¿™æ˜¯ç”±å®ƒçš„电阻特性决定的ã€?/p>
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<p>　　对于抑制电ç£å¹²æ‰°ç”¨çš„é“氧体，最é‡è¦çš„性能å‚数为ç£å¯¼çŽ‡å’Œé¥±å’Œç£é€šå¯†åº¦ã€‚ç£å¯¼çŽ‡å¯ä»¥è¡¨ç¤ºä¸ºå¤æ•°ï¼Œå®žæ•°éƒ¨åˆ†æž„æˆç”µæ„Ÿï¼Œè™šæ•°éƒ¨åˆ†ä»£è¡¨æŸè€—，éšç€é¢‘çŽ‡çš„å¢žåŠ è€Œå¢žåŠ ã€‚å› æ¤å®ƒçš„ç‰æ•ˆç”µè·¯ä¸ºç”±ç”µæ„ŸL和电阻R组æˆçš„串è”电路，电感L和电阻R都是频率的函数ã€?/p>
<p> </p>
<p>　　当导线穿过这ç§é“氧体ç£èŠ¯æ—¶ï¼Œæ‰€æž„æˆçš„电感阻抗在形å¼ä¸Šæ˜¯éšç€é¢‘率的å‡é«˜è€Œå¢žåŠ ，但是在ä¸åŒé¢‘率时其机ç†æ˜¯å®Œå…¨ä¸åŒçš„ã€?在高频段，阻抗主è¦ç”±ç”µé˜»æˆåˆ†æž„æˆï¼Œéšç€é¢‘率的å‡é«˜ï¼Œç£èŠ¯çš„ç£å¯¼çŽ‡é™ä½Žï¼Œå¯¼è‡´ç”µæ„Ÿçš„电感é‡å‡å°ï¼Œæ„ŸæŠ—æˆåˆ†å‡å°ï¼Œä½†æ˜¯ï¼Œè¿™æ—¶ç£èŠ¯çš„æŸè€—å¢žåŠ ï¼Œç”µé˜»æˆåˆ†å¢žåŠ ï¼Œå¯¼è‡´æ€»çš„é˜»æŠ—å¢žåŠ ï¼Œå½“é«˜é¢‘ä¿¡å·é€šè¿‡é“氧体时，电ç£å¹²æ‰°è¢«å¸æ”¶å¹¶è½¬æ¢æˆçƒèƒ½çš„å½¢å¼æ¶ˆè€—掉ã€?/p>
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<p>　　在低频段，阻抗主è¦ç”±ç”µæ„Ÿçš„感抗构æˆï¼Œä½Žé¢‘æ—¶R很å°ï¼Œç£èŠ¯çš„ç£å¯¼çŽ‡è¾ƒé«˜ï¼Œå› æ¤ç”µæ„Ÿé‡è¾ƒå¤§ï¼Œç”µæ„ŸL起主è¦ä½œç”¨ï¼Œç”µç£å¹²æ‰°è¢«å射而å—到抑制，并且这时ç£èŠ¯çš„æŸè€—较å°ï¼Œæ•´ä¸ªå™¨ä»¶æ˜¯ä¸€ä¸ªä½ŽæŸè€—ã€é«˜å“è´¨å› ç´ Q特性的电感，这ç§ç”µæ„Ÿå®¹æ˜“é€ æˆè°æŒ¯ï¼Œå› æ¤åœ¨ä½Žé¢‘段时å¯èƒ½ä¼šå‡ºçŽ°ä½¿ç”¨é“氧体贴片ç£ç åŽå¹²æ‰°å¢žå¼ºçš„现象ã€?/p>
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<p>　　值得注æ„的是，高频噪声的能é‡æ˜¯é€šè¿‡é“氧体ç£çŸ©ä¸Žæ™¶æ ¼çš„耦åˆè€Œè½¬å˜ä¸ºçƒèƒ½æ•£å‘出去的，并éžå°†å™ªå£°å¯¼å…¥åœ°æˆ–者阻挡回去，如æ—è·¯ç”µå®¹é‚£æ ·ã€‚å› è€Œï¼Œåœ¨ç”µè·¯ä¸å®‰è£…é“氧体贴片ç£ç 时，ä¸éœ€è¦ä¸ºå®ƒè®¾ç½®æŽ¥åœ°ç‚¹ã€‚这是é“氧体ç£ç çš„çªå‡ºä¼˜ç‚¹ã€?/p>
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