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如何设计出高效率的高频å˜åŽ‹å™¨?</h3>
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<p><span style="font-size: 14px">　　高频å˜åŽ‹å™¨æ˜¯å¼€å…³ç”µæºä¸è¿›è¡Œèƒ½é‡å‚¨å˜ä¸Žä¼ 输的，一个高效率高频å˜åŽ‹å™¨åº”具备直æµæŸè€—和交æµæŸè€—低ã€æ¼æ„Ÿå°ã€ç»•ç»„本身的分布电容åŠå„绕组的耦åˆç”µå®¹è¦å°ç‰æ¡ä»¶ã€?/span></p>
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<p><span style="font-size: 14px">　　<strong><a href="http://www.chenfeipower.com/product/product-0001,0015.shtml">高频å˜åŽ‹å™?/a></strong>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=4ï½?0A/mm2ã€?/span></p>
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<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如图1 。举例说明，当f=100kHz时，导线直径ç†è®ºä¸Šå¯å?phi;0.4mm。但 å‡å°è¶‹è‚¤æ•ˆåº”，更细的导线多股并绕，而ä¸ç”¨ä¸€æ ¹ç²—导线绕制ã€?/span></p>
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<p><span style="font-size: 14px">　　在设计高频å˜åŽ‹å™¨æ—?把æ¼æ„Ÿå‡è‡³æœ€å°ã€‚æ¼æ„Ÿæ„ˆå¤§ï¼Œäº§ç”Ÿçš„尖峰电压幅度愈高，æ¼æžé’³ä½ç”µè·¯çš„æŸè€—就愈大，这必然 电æºæ•ˆçŽ‡é™ä½Žã€?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%ï½?%ã€?/span></p>
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