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高频å˜åŽ‹å™¨æŸè€—çš„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>　　<strong>高频å˜åŽ‹å™?/strong>的交æµæŸè€—是由高频电æµçš„趋肤效应以åŠç£èŠ¯çš„æŸè€—引起的。所谓趋肤效应是对于导体ä¸çš„交æµç”µæµï¼Œé 近导体表é¢å¤„的电æµå¯†åº¦å¤§äºŽå¯¼ä½“内部电æµå¯†åº¦çš„现象。éšç€ç”µæµé¢‘率的æ高，趋肤效应使导体的电阻增大，电感å‡å°ã€‚高频å˜åŽ‹å™¨ 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ã€?/p>
<p>　　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—超过高频电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。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¸ç”¨ä¸€æ ¹ç²—导线绕制ã€?/p>
<p>　　在设计高频å˜åŽ‹å™¨æ—¶å¿…须把æ¼æ„Ÿå‡è‡³æœ€å°ã€‚å› ä¸ºæ¼æ„Ÿæ„ˆå¤§ï¼Œäº§ç”Ÿçš„尖峰电压幅度愈高，æ¼æžé’³ä½ç”µè·¯çš„æŸè€—就愈大，这必然导致电æºæ•ˆçŽ‡é™ä½Žã€‚对于一个符åˆç»ç¼˜åŠå®‰å…¨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?ï¼…ä»¥ä¸‹çš„æŒ‡æ ‡ï¼Œåœ¨çŽ°ä»Šçš„åˆ¶é€ å·¥è‰ºä¸Šè¿˜éš¾äºŽå®žçŽ?</p>
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