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銆�銆�2 EMI婵炬尝鍣ㄥ湪闁�(k膩i)闂�(gu膩n)闆绘簮涓殑鎳�(y墨ng)鐢�
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銆�銆�2 EMI婵炬尝鍣ㄥ湪闁�(k膩i)闂�(gu膩n)闆绘簮涓殑鎳�(y墨ng)鐢�
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銆�銆�3 EMI婵炬尝鍣ㄧ殑鎶�琛�(sh霉)鍙冩暩(sh霉)鍙婃脯(c猫)瑭︽柟娉�
銆�銆�3.1 涓昏鎶�琛�(sh霉)鍙冩暩(sh霉)
銆�銆�EMI婵炬尝鍣ㄧ殑涓昏鎶�琛�(sh霉)鍙冩暩(sh霉)鏈夛細椤嶅畾闆诲銆侀瀹氶浕娴�銆佹紡闆绘祦銆佹脯(c猫)瑭﹂浕澹�銆佺禃绶ｉ浕闃汇�佺洿娴侀浕闃�銆佷娇鐢ㄦ韩搴﹁寖鍦�銆佸伐浣滄韩鍗嘥r銆佹彃鍏ユ悕鑰桝dB銆佸褰㈠昂瀵�銆侀噸閲忕瓑銆備笂杩板弮鏁�(sh霉)涓渶閲嶈鐨勬槸鎻掑叆鎼嶈�楋紙浜︾ū鎻掑叆琛版笡锛�锛屽畠鏄⿻(p铆ng)鍍�(ji脿)闆荤骞叉摼婵炬尝鍣ㄦ�ц兘鍎�(y艒u)鍔ｇ殑涓昏鎸囨(bi膩o)銆�
銆�銆�鎻掑叆鎼嶈�楋紙AdB锛夋槸闋荤巼鐨勫嚱鏁�(sh霉)锛岀敤dB琛ㄧず銆傝ō(sh猫)闆荤骞叉摼婵炬尝鍣ㄦ彃鍏ュ墠鍚庡偝杓�?sh霉)鎴�?f霉)杓変笂鐨勫櫔鑱插姛鐜囧垎鍒ョ偤P1銆丳2,鏈夊叕寮忥細
銆�銆�AdB=10lg(P1/P2) (1)
銆�銆�鍋囧畾璨�(f霉)杓夐樆鎶楀湪鎻掑叆鍓嶅悗濮嬬祩淇濇寔涓嶈畩锛屽墖P1=V12/Z锛孭2=V2 2/Z銆傚紡涓璙1鏄櫔鑱叉簮鐩存帴鍔犲埌璨�(f霉)杓変笂鐨勯浕澹�锛孷2鏄湪鍣伈婧愯垏璨�(f霉)杓変箣闁撴彃鍏ラ浕纾佸共鎿炬烤娉㈠櫒鍚庤矤(f霉)杓変笂鐨勫櫔鑱查浕澹�锛屼笖V2<<V1.浠ｅ叆锛�1锛夊紡涓緱鍒帮細
銆�銆�AdB=20lg(V1/V2) (2)
銆�銆�鎻掑叆鎼嶈�楃敤鍒嗚矟锛坉B锛夎〃绀�锛屽垎璨濆�兼剤澶�锛� 瑾�(shu艒)鏄庢姂鍒跺櫔鑱插共鎿剧殑鑳藉姏鎰堝挤(qi谩ng)銆傞憭浜庣悊璜栬▓(j矛)绠楁瘮杓冪叐鐟ｄ笖瑾ゅ樊杓冨ぇ锛岄�氬父鏄敱鐢熺敘(ch菐n)寤犲閫�(j矛n)琛屽(sh铆)闅涙脯(c猫)閲忥紝鏍规摎(j霉)鍣伈闋昏瓬閫愰粸(di菐n)娓�(c猫)鍑烘墍灏�(du矛)鎳�(y墨ng)鐨勬彃鍏ユ悕鑰�锛岀劧鍚庣躬鍑哄吀鍨嬬殑鎻掑叆鎼嶈�楁洸绶�锛屾彁渚涚郸鐢ㄦ埗銆傚湒5绲﹀嚭涓�姊濆吀鍨嬫洸绶�銆傜敱鍔涚枖瑕�(ji脿n)锛岃┎鐢�(ch菐n)鍝佸彲灏�1MHz锝�30MHz鐨勫櫔鑱查浕澹撹“娓�65dB銆�
銆�銆�瑷�(j矛)绠桬MI婵炬尝鍣ㄥ皪(du矛)鍦版紡闆绘祦鐨勫叕寮忕偤锛�
銆�銆�ILD=2蟺fCVc 锛�3锛�
銆�銆�寮忎腑锛孖LD鐐烘紡闆绘祦锛宖鏄浕缍�(w菐ng)闋荤巼銆備互鍦�1鐐轰緥锛宖=50Hz锛孋=C3+C4=4400pF锛孷c鏄疌3銆丆4涓婄殑澹撻檷锛屼害鍗宠几鍑虹鐨勫皪(du矛)鍦伴浕澹�锛屽彲鍙朧c鈮�220V/2=110V銆傜敱锛�3锛夊紡涓嶉洠绠楀嚭锛屾鏅�(sh铆)婕忛浕娴両LD=0.15mA銆侰3鍜孋4鑻ラ伕4700pF锛屽墖C=4700pF脳2=9400pF锛孖LD=0.32mA銆傞’鐒�锛屾紡闆绘祦鑸嘋鎴愭姣�銆傚皪(du矛)婕忛浕娴佺殑瑕佹眰鏄剤灏忔剤濂�锛岄�欐ǎ瀹夊叏鎬ч珮锛屼竴鑸噳(y墨ng)鐐哄咕鐧惧井瀹夎嚦骞炬瀹�銆傚湪闆诲瓙閱�(y墨)鐧傝ō(sh猫)鍌欎腑灏�(du矛)婕忛浕娴佺殑瑕佹眰鏇寸偤鍤�(y谩n)鏍笺��
銆�銆�闇�瑕佹寚鍑�锛岄瀹氶浕娴侀倓鑸囩挵(hu谩n)澧冩韩搴A鏈夐棞(gu膩n)銆備緥濡傚湅(gu贸)澶栨湁鐨勭敓鐢�(ch菐n)寤犲绲﹀嚭涓嬭堪缍�(j墨ng)椹�(y脿n)鍏紡锛�
銆�銆�I=I1脳[(85-TA)/45鐨勬牴鎿�(j霉)2娆℃柟]
銆�銆�寮忎腑锛孖1鏄�40鈩冩檪(sh铆)鐨勯瀹氶浕娴併�傝垑渚嬭(shu艒)鏄�锛岀暥(d膩ng)TA=50鈩冩檪(sh铆)锛孖=0.88I1锛涜�岀暥(d膩ng)TA=25鈩冩檪(sh铆)锛孖=1.15I1銆傞�欒〃鏄庯紝椤嶅畾闆绘祦鍊奸毃婧害鐨勯檷浣庤�屽澶�锛岄�欐槸鐢变簬鏁ｇ啽姊濅欢鏀瑰杽鐨勭罚鏁呫��
銆�銆�3.2 娓�(c猫)閲忔彃鍏ユ悕鑰楃殑鏂规硶
銆�銆�娓�(c猫)閲忔彃鍏ユ悕鑰楃殑闆昏矾濡傚湒6鎵�绀�銆俥鏄櫔鑱蹭俊铏�(h脿o)鐧�(f膩)鐢熷櫒锛孼i鏄俊铏�(h脿o)婧愮殑鍏�(n猫i)閮ㄩ樆鎶�锛孼L鏄矤(f霉)鍝夐樆鎶�锛屼竴鑸彇50惟銆傚櫔鑱查牷鐜囪寖鍦嶅彲閬�10kHz锝�30MHz銆傞鍏堣鍦ㄤ笉鍚岄牷鐜囦笅鍒嗗垾娓�(c猫)鍑烘彃鍏ュ墠鍚庤矤(f霉)杓変笂鐨勫櫔鑱插闄峍1銆乂2锛屽啀浠ｅ叆锛�2锛夊紡涓▓(j矛)绠楀嚭姣忓��(g猫)闋荤巼榛�(di菐n)鐨凙dB鍊硷紝绻嚭鎻掑叆鎼嶈�楁洸绶�銆傞渶瑕佹寚鍑猴紝涓婅堪娓�(c猫)瑭︽柟娉曟瘮杓冪叐鐟�锛屾瘡娆￠兘瑕佹媶瑁滶MI婵炬尝鍣ㄣ�傜偤姝ゅ彲鐢ㄩ浕瀛愰枊(k膩i)闂�(gu膩n)灏�(du矛)鍏╃ó娓�(c猫)瑭﹂浕璺��(j矛n)琛屽揩閫熷垏鎻�銆�
